Light-emitting device and illumination apparatus having said device

FIELD: physics.

SUBSTANCE: light-emitting device (10) has a light-emitting element (1) and an element (2) for controlling light emitted by the light-emitting element (1). The light flux control element (2) has (i) a light-receiving surface (2a) on which light emitted by the light-emitting element (1) falls, and (ii) a light-emitting surface (2b).

EFFECT: high uniformity of light intensity, low reflection coefficient due to Fresnel reflection, improved scattering characteristics.

13 cl, 21 dwg

 

The technical field to which the invention relates

The present invention relates to a light-emitting device and containing the lighting device and more specifically relates to a light emitting device (i), containing the control light flux, and the lighting device containing the light-emitting device that can be used, for example, as a light source for backlight, which performs the planar lighting the liquid crystal panel from the rear surface of the LCD panel, as well as normal indoor lighting.

Prior art

As you know, traditionally the source of surface coverage was used many light-emitting diodes (hereinafter referred to in this document called "LED" on the situation), as a means of lighting, for lighting the liquid crystal monitor used in a personal computer, TV, etc. the Source of surface coverage contains many light-emitting diodes provided in the form of a matrix in tabular region having a shape almost similar to the shape of the liquid crystal panel LCD monitor. The source of surface coverage performs planar lighting LCD monitor with rear the second surface of the LCD monitor by using light from the light-emitting elements. Through control light output, the brightness distribution of the light source surface coverage is almost evenly.

An example of a lighting device using as the light source LEDs, is the device 100 lighting, disclosed in patent literature 1. Fig depicts a view in cross section of conventional lighting device 100. The device 100 lighting includes a light-emitting element 101 located on the rear surface 102, and the element 102 management luminous flux located around the light emitting element 101, which changes the direction of the light emitted by the light emitting elements 101. The liquid crystal panel 106 is located above the lighting device 100. The device 100 lighting is arranged so that light from the element 102 control the luminous flux falling on the liquid crystal panel 106 with almost the same brightness distribution.

In particular, the element 102 control light flux has the form where (i) the angles φ1and ϕ2satisfy the formula ϕ21>1, and (ii) is obtained by formula numeric value with increasing angle φ1gradually decreases, and the angle ϕ1is the angle between the light axis Z and the light emitted by the light emitting what lementa 101, falling on svetoprinimayuschego surface 102a of the element 102 control light output, as well as reaching the light emitting surface 102b of the element 102 control light output 102, and the angle ϕ2is the angle between the light axis Z and the light L emitted from the light emitting surface 102b.

By locating the light emitting surface 102b of the above-described way, it is possible to smoothly expand the luminous flux emitted by the light emitting element 101, a large area of liquid crystal panel 106. That is, in the case when the light source is full of light emitting elements 101, light emitted by the light emitting elements 101, is mixed. Therefore, (i) even if the colors of the radiation of the light emitting elements 101 are the changes (differences), such changes (differences) are less detectable when emitted by element 102 control light output, and (ii) the brightness of the emitted light becomes uniform. This provides the possibility of implementing source surface coverage high quality.

Another example of the light-emitting device using as the light source of the LED diode is a light emitting device disclosed in patent literature 2.

The lighting device, disclosed in Patan the Noah literature 2, arranged so that the control light flux is formed by the bottom surface of the first framing curved surface extending from the bottom surface and through the first inner curved surface extending from the first framing curved surface, and the distance from the center of the bottom surface to an arbitrary point of the first inner curved surface is smaller than the radius of curvature at an arbitrary point of the first Central curved surface. By locating the first inner curved surface as described above it is possible to enhance the luminous flux emitted by the light emitting element, a large area of liquid crystal panel.

The lighting device, disclosed in patent literature 2, it additionally has an empty space in the center of the bottom surface. The inner surface of the empty space formed from the second framing curved surface and the second inner curved surface, and the distance from the center of the bottom surface to an arbitrary point of the second inner curved surface of greater radius of curvature at an arbitrary point of the second inner curved surface. By locating the second inner curved surface in cheapernet way it is possible to enhance the luminous flux of a light emitting element on a large area liquid crystal panel.

The lighting device, disclosed in patent literature 2, further includes a cone-shaped recess in the center of the first inner curved surface to the luminous flux emitted by the light emitting element in a direction that is parallel to the direction of light axis, is refracted in the direction of the outgoing direction of the light axis.

Reference list

Patent literature 1:

Publication of the patent application of Japan No. 2006-92983 A, filed with Tokukai (Tokukai) (publication date: 6 April 2006).

Patent literature 2:

Publication of the patent application of Japan No. 2006-114863 A, filed with Tokukai (Tokukai) (publication date: 27 April 2006).

The invention

However, the above conventional lighting devices have the following problems, respectively.

In the light emitting device 100 described in patent literature 1, the element 102 control light output requires more characteristics of scattering as the distance from the light emitting element 101 to the liquid crystal panel 106 becomes smaller or the same as the distance from the light emitting element 101 to the neighboring light-emitting element becomes large.

To increase the scattering characteristics of the element 102 controls the light output is not bhodemon, so that the light emitted by the light emitting elements 101, has attained a position away from the area directly above the light emitting elements 101, on the liquid crystal panel 106. To obtain such a light must refraction of the emitted light as possible parallel to the liquid crystal panel 106, the light emitting surface 102b. It is necessary to significantly absorb light at the light emitting surface 102b. However, significant refraction of light through the light emitting surface 102b, in General, enhances the reflection due to a phenomenon called Fresnel reflection. That is, the amount of light emitted from the light emitting surface 102b is reduced. In particular, the effect of Fresnel reflection becomes significant in the light-emitting device 100 described in patent literature 1, since the light emitting device 100 is arranged so that the management direction of the light, mainly, was carried out solely on the light emitting surface 102b, and therefore there is a need for significant refraction of light on the light emitting surface 102b for receiving the increased scattering characteristics.

In addition, as shown by direction arrow shown on Fig through dotted the line, the light reflected on the light emitting surface 102b, is then reflected by the back surface 102 of the element 102 management luminous flux or by item 103 of reflection, which is located in contact with the rear surface 102. Then the light is fading around the area directly above the light emitting element 101. In the above, even if the angle of refraction is set large to obtain high characteristics of the scattering element 102 management luminous flux, (i) the amount of light which must reach a position away from the area directly above the light-emitting element, in the end, is reduced, and (ii) the light is condensed in a region directly above the light emitting element 101. In effect this becomes more difficult to obtain a high characteristic scattering.

In addition, patent literature 1 discloses the following as the element structure 102 control light output, where (i) δ1is a constant numeric value, not a large π/2, and (ii) α is a coefficient characteristic of the scattering element 102 control the light flow, and the relationship between the angles φ1and ϕ2is expressed by the relations ϕ2=(1+δ1-ϕ1)×α/δ1)×ϕ1.

Fig depicts dia is a program, illustrating the relationship between the angles φ1and ϕ2the light-emitting device 100. As shown in Fig, if you want greater characteristic scattering in comparison with the characteristic scattering the light-emitting device 100 disclosed in the embodiment of the patent literature 1, the area in which the angle φ1is relatively small, has a region, in which an increase in the angle ϕ1does not change the angle ϕ2.

Fig illustrates the radiation direction, expressed by the relative equations on Fig. In the pictured Fig region, in which an increase in the angle ϕ1does not change the angle ϕ2(i) the direction of radiation are superimposed on each other, and (ii) the emitted light fluxes are concentrated, as shown in Fig, and this formed a bright line of the ring shape. Therefore, forming the uneven brightness. To prevent the formation of such uneven brightness must use element 102 controls a luminous flux having α<1. However, in accordance with this requirement the light emitting device 100 may not receive sufficient characteristic scattering. It is impossible to obtain a sufficient characteristic scattering for easy formation of the control light flux in the form in which h is SlovoEd value φ 21gradually decreases with increasing angle φ1.

In the light-emitting device described in patent literature 2, the radius of curvature significantly changed at the junction of the first inner curved surface with the first framing curved surface so that the light refracted to the light axis for framing curved surface. In consequence, the light emitted near the junction, thickens, and this formed a vivid circle line. To prevent the formation of bright lines in the embodiment, it is proposed to use type light-emitting device, which has first framing curved surface. However, this structure has a large lens and therefore is not practical. The reason for this can be explained as follows. The lens is greater in the structure in which the distance from the center of the bottom surface to an arbitrary point of the first inner curved surface is set smaller than the radius of curvature at an arbitrary point of the first inner curved surface. It is therefore necessary to provide the first framing curved surface.

In addition, in patent literature 2 describes that the lighting device can have a first framing curved surface, the inner iskrivlennoi the surface, and most of the internal curved surface. However, the most inner curved surface has a conical geometry, allowing light emitted in the direction of the light axis from the center of the bottom surface, is refracted in the direction departing from the optical axis. In this case, it becomes dimmer on the light axis controls a luminous flux, which leads to pitting of uneven brightness. Therefore, by using the invention disclosed in patent literature 2, it is difficult to prevent uneven brightness, although it is possible to diffuse light.

The present invention is created taking into account the problem and the purpose of the invention is to implement a light-emitting device that (i) diffuses the light without generating uneven brightness on the liquid crystal panel, and (ii) it has an improved characteristic scattering, that is obtained by reducing the reflection coefficient caused by the Fresnel reflection.

To achieve the goal light-emitting device of the present invention includes: a light-emitting element, and the control light flow to control the light emitted by the light emitting element, and the control light flux has (i) svetoprinimayuschego surface from which the light, the COI is seemy light-emitting element, gets to control light output, and (ii) light-emitting surface from which the light incident on svetoprinimayuschego surface, is emitted by the control light flux, and satisfies the following equation (2):

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, P(ϕ1) is a characteristic of the light distribution of a light emitting element which is a constant defined to satisfy ϕ1=0 when r=0, δ is a constant that indicates the characteristic scattering, and A gain by the following equation (1):

In the light-emitting device that satisfies the above equations (1) and (2), it is possible to make the distribution of light emitted by the light emitting element, close to the Gaussian distribution on a plane that is provided at a certain distance in the direction, which is what I parallel in relation to the reference light axis so that to be perpendicular to the reference light axis, for example, on the liquid crystal panel. Therefore, it is possible to prevent uneven brightness caused by the light on the plane.

Additional objectives, features and properties of the effectiveness of the present invention will be clarified by the following description. In addition, the advantages of the present invention will be expressed through the following explanations with reference to the drawings.

Brief description of drawings

Figure 1 depicts a view in cross section illustrating a variant implementation of the light-emitting device, in accordance with the present invention.

Figure 2 depicts a view in cross section illustrating a variant implementation of the light-emitting device, in accordance with the present invention.

Figure 3 depicts a view in cross-section, detail illustrating the light emitting device illustrated in figure 1.

Figure 4 depicts a view in cross-section, detail illustrating the light emitting device illustrated in figure 1.

Figure 5 depicts a view in cross-section, detail illustrating the light emitting device illustrated in figure 1.

6 depicts a diagram illustrating the relationship between the angles φ1and ϕ2in the case to the da δ of the light-emitting device of the present invention is set equal to 35 mm, and the distance between the light-emitting device and liquid crystal panel is set to 20 mm

7 depicts a diagram illustrating the relationship between the angle φ1and the angle ϕ21in the light emitting device 10, illustrated in figure 5.

Fig depicts a chart illustrating the relationship between the angles φ1and ϕ2in the case when δ of the light-emitting device of the present invention is set equal to 70 mm, and the distance between the light-emitting device and liquid crystal panel is set to 20 mm

Fig.9 depicts a chart illustrating the relationship between the angles φ1and ϕ2and the reflectance in the light-emitting device of the present invention.

Figure 10 depicts a view in cross section illustrating a variant implementation of the light-emitting device, in accordance with the present invention.

11 depicts a view in cross section illustrating another variant implementation of the light-emitting device, in accordance with the present invention.

Fig depicts a view in cross section illustrating another variant implementation of the light-emitting device, in accordance with the present invention.

Fig depicts a view in cross section illustrating another variant implementation swetoslaw the first device, in accordance with the present invention.

Fig depicts a view in cross section illustrating another variant implementation of the light-emitting device, in accordance with the present invention.

Fig depicts a view in cross section illustrating another variant implementation of the light-emitting device, in accordance with the present invention.

Fig depicts a chart illustrating the distribution of brightness on the liquid crystal panel in the case of using the light-emitting device, in accordance with the present invention.

Fig depicts a view in cross section illustrating another variant implementation of the light-emitting device, in accordance with the present invention.

Fig depicts a view in cross section illustrating a variant implementation of the light-emitting device, in accordance with the present invention, which has a light-diffusing surface.

Fig depicts a view in cross section illustrating a conventional light emitting device.

Fig depicts a chart illustrating the relationship between the angles φ1and ϕ2in the conventional light-emitting device illustrated in Fig.

Fig depicts a view illustrating the direction in which the light beam is emitted in the normal svetol is emitting device, illustrated on Fig.

List of reference numbers

1 - light-emitting element

2 - the control light flux

2a - svetoprinimayuschego surface

2b - light-emitting surface

2c - plane

2d textured surface

2e is a light-diffusing surface

2f - end surface

3 - reflecting plate (item prevent admission of light)

4 is a reflective element (the element to prevent the admission of light)

5 - light diffusing element

6 - LCD panel

10-16 - emitting device

α1angle

α2-angle

Δα1angle

Δα2angle

R1distance

R2distance

P - focal point

P1point of reception of light

P2- the point of emission of light

Z is an axis of light (reference light axis)

Description of embodiments

The first option exercise

Below with reference to Figures 1 to 9 described one implementation of the present invention. Figure 1 depicts a view in cross section illustrating the light emitting device 10, in accordance with the present embodiment. The light emitting device 10, illustrated in figure 1, includes a light-emitting element 1 and element 2 control light output, set the AK, to surround and cover the light-emitting element 1. The direction of the light axis Z of the reference light axis) indicates the direction in which the spatial light passes in the center of the light flux emitted by the light-emitting element 1. For convenience, figure 1 is a direction which is vertical to the light-emitting element 1, marked as the light axis Z of the reference light axis).

In addition, the light emitting device 10 has a rotationally symmetric shape with respect to the light axis Z. However, the light-emitting element 1 is not required to have a rotationally symmetric shape. Alternative light-emitting element 1 can have a one-piece rectangular shape or the like. Item 2 management light flux changes the direction of the light L emitted by the light-emitting element 1. That is, item 2 management luminous flux refracts light L is more parallel to the direction which is perpendicular with respect to the light axis Z, for scattering light L.

Item 2 management luminous flux is an element serving to change the direction of light emitted from the light-emitting element 1. Item 2 management luminous flux, in particular, is not limited. However, item 2 management luminous flux preferably shatavri is moved from a transparent material, having a refractive index not less than the 1.45 and not more than 1,65. In addition, it is also preferable to item 2 management luminous flux made of transparent synthetic resin or glass. An example of such a transparent synthetic resin is polymethylmethacrylate (PMMA)having a refractive index equal 1,49, polycarbonate (PC)having a refractive index 1.59, epoxy resin (EP), etc.

Item 2 management light flux has svetoprinimayuschego surface 2a as the inner surface, the light emitting surface 2b as the outer surface and the bottom surface 2c, which connects svetoprinimayuschego surface 2a with the light emitting surface 2b. Item 2 management light flux has an empty space, and in this empty space is a light-emitting element 1. The light-emitting element 1 is an element that emits light in the external environment, with the light axis Z in the center of the light radiation. The light emitting device 1, in particular, is not limited, and as a light-emitting element can be used conventional diode LED.

Svetoprinimayuschego surface 2a is an internal surface of the element 2 of the control light output. As illustrated in figure 1, svetoprinimayuschego surface 2a has a priest who ecou surface, the path which intersects with the light axis Z, essentially vertical to the light axis Z, and significantly changes its angle around the light axis Z. In the field, away from the light axis Z, the angle of the path svetoprinimayuschego surface 2a varies less. Essentially, svetoprinimayuschego surface 2a has a cross-shaped surface of the bell. On the other hand, the light emitting surface 2b, which is the outer surface of the element 2, control light flux has a transverse surface, the contour of which is essentially vertical to the light axis Z, and about the light axis Z varies less. The angle of the path the light emitting surface 2b varies considerably in the field, away from the light axis Z, and gradually becomes parallel to the light axis Z. essentially, the light emitting surface 2b has a cross-shaped surface of the recess around the light axis Z.

Figure 2 depicts a view in cross section of the light-emitting device 11 in accordance with the present embodiment. In accordance with the present embodiment, the direction of light changes as svetoprinimayuschego surface 2a and the light emitting surface 2b. Essentially, it is possible to form the light emitting surface 2b of the convex is th form around the light axis Z, as shown in figure 2.

Fig depicts the light emitting device 100, disclosed in patent literature 1. Using the light-emitting device 100, the light direction is changed only on the light emitting surface 102b. Essentially, the light emitting surface 102b is formed in a concave shape around the light axis Z. on the other hand, in accordance with the present invention the light emitting surface 102b of the light-emitting device is not limited to a concave shape in contrast to the light-emitting device 100. Alternative light-emitting surface 102b may also be performed in a convex and concave shape, as in the light emitting device 10 and the light-emitting device 11, respectively. Essentially, the degree of freedom in designing can be higher.

Next, with reference to Figure 3, the following description explains a structure in which the direction of the light L is changed to the light emitting surface 2b of the element 2 of the control light output. Figure 3 depicts a view in cross section illustrating part of the light-emitting device 10, illustrated in figure 1.

Figure 3 svetoprinimayuschego surface 2a has a concave curve, which is axisymmetric with respect to the reference light axis Z of the light-emitting device 10. If the point of intersection of the reference light axis Z and the PLO the bones of the radiation is set as the reference point O, then α1specifies the angle between the reference light axis Z and a straight line which passes through the reference point O in the direction of the point P3on svetoprinimayuschego surface 2a, and R1specifies the distance between the arbitrary point R3and the reference point O. In the case of lambertuccio distribution characteristic of light distribution conventional light-emitting element, the distance R1monotonically decreases with increasing angle α1at least in the range α1<π/3, and the range of brightness is not less than half the brightness of the light emitted in the direction of the light axis.

In the specification of this application radian is used as the angular designations, unless otherwise noted. The light emitting surface 2b has (i) a convex curved part, which is axisymmetric with respect to the reference light axis Z, and (ii) deepening passing in the direction of the convex curved parts in the field, covering the intersection of the light emitting surface 2b with the reference light axis Z. If (i) α2is the angle between the reference light axis Z and a straight line which passes through the reference point O in the direction of an arbitrary point in P4on the light emitting surface 2b, and (ii) R2is the distance between the reference point O and the point is th R 4on the light emitting surface 2b, R2monotonically increases with α2at least in the range α2< π/3.

As mentioned above, the light L incident on svetoprinimayuschego surface 2a, is refracted outward. Then, the light L is additionally refracted when radiation from svetoprinimayuschego surface 2b. The following description explains the principle of this. Suppose that the point P3,on svetoprinimayuschego surface 2a, svetoprinimayuschego surface has a shape in which an increase in the angle α1does not change the distance R1i.e. the increment ΔR1the distance R1increases compared to the increment Δα1angle α1equals 0, illustrated in figure 3 in cross section. In this case svetoprinimayuschego surface has an annular shape centered on the reference point O, and has a radius distance R1. Therefore, the light falls vertically on svetoprinimayuschego surface. Essentially, the light is transmitted without deviation.

On the other hand, suppose svetoprinimayuschego surface has a shape in which the distance R1decreases with increasing angle α1i.e. the increment ΔR1the distance R1increases compared to the increment Δα1angle α expressed by ΔR1<0, illustrated in figure 3 in cross section. In this case, the line tangent at the point P3on svetoprinimayuschego surface 2a becomes more parallel to the light axis Z in comparison with the arc of a circle which is centered on the reference point O, and has a radius distance R1. Essentially, the light emitted from the reference point O, as well as falling at an arbitrary point R3that is refracted in the direction departing from the optical axis, and is also passed element 2 control light output. If the above is specified that ΔR1/R1Δα1=And1a1is expressed by A1<0.

On the other hand, on the light emitting surface 2b of the distance R2increases with angle α2. Essentially, the line tangent at the point P4on the light emitting surface 2b is the most perpendicular with respect to the light axis Z in comparison with the line tangent to the circle which is centered on the reference point O and the radius distance R2. Therefore, the light that falls on the point R4from the direction in which the straight line passes through the reference point O to the point P4,additionally refracted in the direction of the outgoing light axis Z. In practice as to ensure the Jena svetoprinimayuschego surface 2a, the angle between (i) the light L incident on the point P4,and (ii) the normal at the point P4more (i) the angle between the normal at the point P4and (ii) a straight line passing through the point P4to the reference point O, as shown in figure 3. Therefore, advanced light is refracted in the direction departing from the optical axis. As described above, it is possible to obtain a light emitting device having the characteristic scattering, by providing the light-emitting device with svetoprinimayuschego surface 2a and the light emitting surface 2b having the above distinctive features.

Next, with reference to Figure 4, the description clarifies the requirements for light emission from the light emitting surface 2b. Initially, the following description affects the luminous flux incident on the point P4from the direction in which the straight line passes through the reference point O to the point P4on the light emitting surface.

If (i) β is the angle between the normal at the point P4and a straight line passing through the reference point O to the point P4and (ii), ΔR2is the change (difference) distances R2when the angle α2changes to the minimum increment Δα2, tanβ= ΔR2/R2Δα2. Then if n is the refractive index, it is necessary to have the following ur is the ranking nsinβ≤1 for emitting light from the light emitting surface. If it is determined that ΔR2/R2Δα2=A2then A2≤1. This expression must be satisfied for the radiation from the light emitting surface 2b of the light flux incident at a point P4from the direction in which the straight line passes through the reference point O to the reference point of the P4on the light emitting surface. This example refers to the case when the light emitted from a reference point On, falls on the light emitting surface 2b without refraction at svetoprinimayuschego surface 2a. In practice, however, light emitted from a reference point O is refracted on svetoprinimayuschego surface 2a. Essentially, the angle of incidence of light to enter the point P4on the light emitting surface 2b becomes larger than the angle β. Therefore, total reflection is always obtained when the condition A2≥1.

Essentially, must be fulfilled at least the following condition: A2<1.

The above description refers to the case that does not imply α1=0 and α2=0. In the case when α1=0 and α2=0, the light emitted from the light-emitting element in the direction of the light axis, must be emitted in the direction of the light axis. Therefore, A1and A2are set to 0. Through this perhaps is predotvratite lack, described in patent literature 2, namely, that light becomes dimmer in the area directly above the light-emitting element 1.

Figure 5 φ1is the angle between the light axis Z and the light L emitted by the light emitting element 1, and is incident on svetoprinimayuschego surface 2a. ϕ2is the angle between (i) the light L incident on svetoprinimayuschego surface 2a, falling on the light emitting surface 2b, and emitting from the light emitting surface 2b, and (ii) a line that is parallel to the light axis Z, and passes through the point R2radiation, in which the light L falls on the light emitting surface 2b.

In addition, figure 5 point R1receiving light is a point through which the light L emitted by the light emitting element 1 falls on svetoprinimayuschego surface 2a, while θ1is the angle between the light L entering from point R1receiving light, and the normal at the point P1receiving light. In addition, the point P2the emission of light is a point on the plane of the radiation, from which the light L is transmitted through the element 2 control the luminous flux and falls on the light emitting surface 2b. θ2is the angle between the light L entering the point P2the emission of light and the normal of the point P 2the emission of light.

As shown in Figure 5, the light L emitted by the light emitting element 1 (i), falls on svetoprinimayuschego surface 2a, and then (ii) is passed through the element 2 control light output, and ultimately (iii) radiates outward (for example, the light emitted into the air) from the light emitting surface 2b by law Snell. In the above process the luminous flux of the light-emitting element 1 is refracted in the direction of the outgoing light from the Z-axis, as well as radiating element 2 control the luminous flux of the present invention.

To prevent uneven brightness by means of additional improvements to the scattering characteristics of the light-emitting device 10, as expected, it is preferable to arrange so that the light L emitted by the light emitting element 1 is distributed like a Gaussian distribution, in which it becomes bright on the light axis of the light-emitting device 10, along with the fact that he becomes dimmer away from the light axis Z. as such, the inventor has conducted an extensive study and as a result discovered that the light L emitted by the light-emitting element having the characteristic P(φ1) light distribution should be extended to the following requirements.

That is, the inventor has discovered, Thu is possible, so that the light L emitted by the light-emitting element 1 having the characteristic P(φ1) light distribution, were distributed on the basis of a Gaussian distribution on a plane, for example, on the LCD panel, if it is satisfied the above-mentioned equation (2)where r is the length from the light axis Z, the plane that is provided at a certain distance from item 2 management luminous flux in the direction of the light axis Z so as to be perpendicular to the light axis Z, ϕ1is the angle between the light L and the light axis Z, is a constant defined to satisfy ϕ1=0 when r=0, δ is a constant that indicates the characteristic scattering, and A gain by the above equation.

As described above, it is possible to receive the light L, that is, when a Gaussian distribution on the liquid crystal panel through the light-emitting element 1 satisfying the requirements. This provides the ability to prevent the formation of a bright circular line on the plane and/or the formation of bright spots in the light-emitting device 10. Therefore, it is possible to prevent the generation of uneven brightness of the light L emitted by the light-emitting element 1.

Labertouche distribution, expressed by the characteristics of the distribution P(is 1)=P0factor1(P0is a constant) normal diode LED, has a special significance. Labertouche distribution can be transformed into a Gaussian distribution in the plane (liquid crystal panel) in the case satisfy the above equation. It additionally prevents the uneven brightness of the light L emitted by the light-emitting element 1.

In accordance with equations (1) and (2)if the distance between the light emitting device 100 and the liquid crystal panel 106 is set equal to 20 mm in the light-emitting device 100 depicted in Fig, the shape of the lens α=1, which is disclosed in patent literature 1, approximates the shape of the lenses δ=30 mm, It reflects what form the light-emitting device 100 disclosed in patent literature 1, it is difficult to further improve the characteristic scattering.

6 depicts a diagram illustrating the relationship between the angles φ1and ϕ2in the case when δ is set equal to 35 mm, and the distance between the light-emitting device and liquid crystal panel is set to 20 mm As shown in Fig.6, the angle ϕ2monotonically increases with angle ϕ1. Therefore, as shown in Fig, the area in which an increase in the angle ϕ1does not change the angle ϕ2not prisutstvuet depicts a chart illustrating the relationship between the angles φ1and ϕ21in the case depicted in Fig.6. As shown in Fig.7, the relationship between the angles φ1and ϕ21is nonlinear. Diagram 7 illustrates the presence of the inflection point. On the other hand, the relationship between the angles φ1and ϕ21varies linearly in the design described in patent literature 1.

Fig depicts the relationship between the angles φ1and ϕ21in the case where the characteristic scattering additionally improved to δ=70 mm Fig depicts in more detail the difference between the present invention and the invention disclosed in patent literature 1, by displaying the fact that in the present invention, the angle φ21quickly decreases with increasing angle φ1in the region where the angle ϕ1is small, whereas the angle ϕ21moderately decreases to 1 with increasing angle φ1in the region where the angle ϕ1is great.

Fig.9 depicts a diagram illustrating a relationship between an angle θ12and the reflectance in the light-emitting device 10. Figure 9 the vertical axis indicates the reflection coefficient, and the horizontal axis denotes θ12in the logarithm. The coefficient reflects who I am, depicted in Figure 9, comprises a reflection on svetoprinimayuschego surface 2a and the reflection on the light emitting surface 2b. In the conventional light emitting device 100 depicted in Fig, the angle θ12is set to zero (in the light emitting device 100 angle θ1equal to zero). The numerical value of the asymptotes of the curve in Figure 9 shows the reflection coefficient in the conventional technology. For example, the asymptote of the curve And Δϕ=7π/45 indicated by dotted lines, having a reflection coefficient equal to 15.8%. That is, the reflection coefficient, 15.8%, receive conventional technology if Δϕ=7π/45.

In contrast to the light-emitting device 100, in accordance with the conventional technology, the light emitting device 10, in accordance with the present invention, is arranged so that the direction of the light L has changed as svetoprinimayuschego surface 2a and the light emitting surface 2b. Essentially, the reflection coefficients of the curves is less than the numeric values of the asymptotes, respectively. This demonstrates that the light-emitting device 10 may further reduce the reflection coefficient compared with the light emitting device 100. Using constant Δϕ minimum reflectance can be obtained in the case when θ12=1, i.e. when θ12./sub> This shows that the reflection coefficient increases with Δϕ.

In item 2 management luminous flux to improve the characteristics of the light scattering light L emitted by the light emitting element 1 must be refracted as close as possible to the direction that is perpendicular with respect to the light axis X. In essence, it is necessary to obtain a large Δϕ. In addition, it is preferable to set the reflection coefficient is equal to 15% or less, because the analysis of the inventor by a ray-tracing confirms that the characteristic scattering is improved if the reflection coefficient when the Fresnel reflection element 2 of the control light flux at the maximum point of more than 15%. When considering the chart of requirements for the reflection coefficient, equal to 15% or less, expressed by the following equations(9)-(15):

if Δϕ ≤ 3π/20, 0 ≤ θ12equation (9)

if Δϕ = 7π/45, 1/25,8 ≤ θ12≤ 25,8 equation (10)

if Δϕ = π/6, 1/6,8 ≤ θ12≤ 6,8 equation (11)

if Δϕ = 7π/36, 1/2,5 ≤ θ12≤ 2.5 equation (12)

if Δϕ = 2π/9, 1/1,6 ≤ θ12≤ 1,6 equation (13)

if Δϕ = π/4, 1/1,2 ≤ θ12≤ 1.2 equation (14) and

if Δϕ = 23π/90, 1/1,1 ≤ θ12≤ 1,1 equation (15)

One is to the reflection coefficient cannot be set equal to 15% or less in the case when Δϕ≥47π/180. Given this, it is possible to set the reflectance of 15% or less by satisfying either of the following equations (4)-(8) and (16):

if Δϕ ≤ 7π/45, 1/25,8 5 ≤ θ12≤ 25,8 equation (4)

if Δϕ ≤ π/6, 1/6,8 ≤ θ12≤6,8 equation (5)

if Δϕ ≤ 7π/36, 1/2,5 ≤ θ12≤2.5 equation (6)

if Δϕ ≤ 2π/9, 1/1,6 ≤ θ12≤ 1,6 equation (7)

if Δϕ ≤ π/4, 1/1,2 ≤ θ12≤1.2 equation (8) and

if Δϕ ≤ 23π/90, 1/1,1 ≤ θ12≤1,1 equation (16)

Therefore, it is possible to obtain an increased characteristic of scattering light L in the light-emitting device 10 in comparison with the light emitting device 100 in accordance with conventional technology.

In addition, the use of the light-emitting device in accordance with the present embodiment allows to provide a lighting device that contains a light-emitting device. Using the lighting device containing a light-emitting device, in accordance with the present embodiment it is possible to provide a lighting device with high characteristic scattering, obtained by reducing the reflection coefficient caused by the Fresnel reflection. Specific examples of the lighting device are zhidkokristal the definition device rear lights, signs, etc.

When the above structure is used as a backlight for liquid crystal display devices, it is possible to emit light at a plane above the light-emitting device 10, and perpendicular to the light axis Z in such a way that the light is more evenly distributed on the plane in the direction of the outgoing from the light-emitting element 1, as compared with the control light flux not located in accordance with the present embodiment. The plane is the plane on which ensured nieustraszony LCD panel. Consequently, it is possible to provide a light-emitting device 10, which may receive an increased characteristic scattering by reducing the reflectance by the Fresnel reflection.

The second option exercise

The following, with reference to Figure 10-12, describes another variant of implementation in accordance with the present invention. The structure other than described in this embodiment is similar to the structure described in the first embodiment. For simple explanation, elements having functions similar to the functions shown in the figures in the first version of what westline, assigned the same numbers, and their explanation is omitted.

Figure 10 depicts a view in cross section of the light-emitting device 10 in accordance with the present embodiment. In the light-emitting device illustrated in Figure 10, the light-emitting element 1 and element 2 of the control light flux is provided at a certain distance from each other. In this structure, a part of the light emitted by the light emitting element 1 can directly get to the bottom surface 2c, not getting on svetoprinimayuschego surface 2a. Then the light is transmitted through the element 2 of the control light flux is condensed on the light emitting surface 2b and the quality of the light L falls on the LCD panel, making it formed a bright line. Bright line has a ring shape and is located in the center part, directly above the light-emitting element 1. As a result of uneven brightness on the liquid crystal panel 6 can not be improved.

To prevent such phenomenon, the inventor has invented a light-emitting device containing the element to prevent reflection. 11 depicts a view in cross section of the light-emitting device 12 in accordance with the present embodiment. In contrast to the light-emitting device 10 described in the first VA is iante implementation the light emitting device 12 includes a reflecting plate 3 on a plane that is perpendicular with respect to the light axis Z, and surrounds the light-emitting element 1. In addition, the reflecting element 4 (element prevent the admission of light) is provided on the lower part of the lower surface 2c to be in front of the reflecting plate 3. Between the reflecting plate 3 and the reflecting element 4 may be formed in the empty space.

The reflecting plate 3 can use a regular reflective plate. Specific examples of the conventional reflective plate includes a film made of resin such as polyester or the like, and with the addition of white pigment, a film containing small bubbles, etc. Therefore, the reflecting plate 3 is not limited to a specific type. In addition, the reflecting element 4 can use a regular reflective element. Examples of conventional reflective element includes a film made of resin such as polyester or the like, and with the addition of white pigment, a film containing small bubbles, etc. Therefore, the reflecting element 4 is not limited to a specific type.

Preferably, there was no empty space between the reflecting plate 3 and the reflecting element 4, since the light from the light is sluchayah element 1 does not fall directly on the bottom surface 2c. However, because of the different qualities of the elements forming the light-emitting device 12, in practice, is formed empty space.

In accordance with the light emitting device 12 to output the light emitted by the light emitting element 1, the light passing to the bottom surface 2c side of empty space, is reflected by the reflecting element 4. Then the light hits the reflective plate 3 and is additionally reflected by the reflective plate 3. Therefore, the light emitted by the light emitting element directly to the bottom surface 2c, misses on item 2 management luminous flux.

Therefore, the light emitted by the light emitting element 1 is incident on the element 2 of the control light flux from the bottom surface 2c, which reduces the probability of formation of a bright line ring forms on the liquid crystal panel 6. In addition, the light reflected thereby through the reflecting element 4, is reflected by the reflective plate 3 provided around the light-emitting element 1 so that, ultimately, be used to illuminate the liquid crystal panel 6. Therefore, the light utilization efficiency will be reduced with the lowest probability.

The above description explains a method of ensuring reflect the element as the element to prevent the admission of light. Alternatively, the element to prevent the admission of light may be, as in the light emitting device 13 depicted in Fig, textured surface 2d, prepared by texturing the bottom surface 2c. Textured surface refers to the surface subjected to texturing. An example of the textured surface includes a surface processed to have a slight unevenness of the printed dot or similar structure.

In this structure, the light falling on the textured surface 2d, scatters, making on the liquid crystal panel 6 is formed blurred the bright line of the ring shape. Therefore, the uneven brightness is less detectable. In addition, when using the surface subjected to texturing, it is possible to provide a textured surface 2d as formation control, light output, reducing the cost.

A third option exercise

The following, with reference to Fig-18, describes another variant implementation in accordance with the present invention. Patterns other than those described in the present embodiment, are similar to the structures described in the first embodiment. DL is convenience items having functions similar to the functions shown in the figures in the first embodiment, are assigned the same reference numbers, and their explanation is omitted.

Fig depicts a view in cross section of the light-emitting device 14 in accordance with the present embodiment. The light emitting device 14 includes a light-diffusing element 5 wedge-shaped on the bottom surface 2c. Light diffusing element 5 is not limited to a specific type, provided that the light diffusing element 5 (i) reflects light in a manner analogous to the faces of a prism having a wedge-shaped form or the like, and (ii) rejects the light direction almost perpendicular to the light axis Z. On Fig light diffusing element 5 has a rotationally symmetric shape with respect to the light axis Z, and the integral form, surrounding the light axis Z. alternatively, the light diffusing element 5 may be formed partially surrounding the light axis Z.

To provide a detailed explanation of the light diffusing element 5, the following description initially explains the distribution of brightness on the liquid crystal panel, the light-emitting device that does not contain a light-diffusing element 5. Fig depicts a view in cross section illustrating the light emitting condition is the device 15, not containing a light-diffusing element 5.

In the light emitting device 15, the light emitted by the light emitting element 1 falls on svetoprinimayuschego surface 2a, and then is emitted as light L1 on the light emitting surface 2b. However, due to the Fresnel reflection of the light is not emitted from the light emitting surface 2b, and is reflected. Then the light is reflected in accordance with the Fresnel reflection at the bottom surface 2c or refracted by the reflective plate 3 in contact with the bottom surface 2c. Then light again falls on the light emitting surface 2b. The light falling on the light emitting surface 2b, is refracted more parallel to the light axis, and then as the light L2 enters the liquid crystal panel 6.

Therefore, in the light emitting device 15, the light tends to be brighter around the light axis Z on the liquid crystal panel 6 which forms the uneven brightness is about the light axis Z.

Next, the following description explains the distribution of brightness on the liquid crystal panel, the light-emitting device that contains a light-diffusing element 5. Fig depicts a view in cross section illustrating the light emitting device 14, which contains svetorasseivayuschim the th element 5.

In the light emitting device 14, the light emitted by the light emitting element 1 falls on svetoprinimayuschego surface 2a, and then is emitted as light L1 on the light emitting surface 2b. However, due to the Fresnel reflection of the light is not emitted from the light emitting surface 2b, and is reflected, as in the case of the light-emitting device 15. The light reflected thereby is condensed at the focal point P on the bottom surface 2c. In the light emitting device 14 light diffusing element 5 is formed around the focal point P, due to which the light reflected on the basis of Fresnel reflection, fading in the light diffusing element 5. Part of the world, chamaemoro in the light diffusing element 5, is emitted as light L3 in a direction that is almost parallel to the light axis Z. on the other hand, most of the light is refracted closer to the direction that is perpendicular with respect to the light axis Z, and is radiated as light L4. This provides the ability to control a large fraction of the light emitted by the light emitting element 1 is refracted by item 2 management light flux and a light-diffusing element 5 is closer to the direction that is perpendicular with respect to the light axis Z. Therefore, the group is a rotary light-emitting device, contains light-diffusing element 5, it is possible to further prevent the formation of uneven brightness.

In particular, the position at which is located a light-diffusing element 5 is not limited, provided that the light diffusing element 5 refracts more light from the light emitting surface 2b almost along the direction that is perpendicular with respect to the light axis Z. In particular, it is preferable to provide a light-diffusing element 5 at the focal point P, because it allows the smaller prism shaped to refract almost along the direction that is perpendicular with respect to the light axis Z, the greater the amount of light reflected on the basis of the Fresnel reflection from the light emitting surface 2b. The focal point P is located on the bottom surface 2c, approximately at the position close to the light emitting surface 2b.

Fig depicts a chart illustrating the distribution of brightness on the liquid crystal panel 6 in the case of using the light-emitting devices 14 and 15, respectively. On Fig the vertical axis indicates the relative distribution of brightness on the liquid crystal panel 6, and the horizontal axis indicates the position on the liquid crystal panel to the middle point of the horizontal axis, the corresponding position will have is asasa directly above the light-emitting elements 1 light-emitting devices. On Fig solid line indicates the brightness distribution of the light-emitting device 14 containing a light-diffusing element 5, and the dotted line indicates the brightness distribution of the light-emitting device 15 that does not contain a light-diffusing element 5.

Comparing the solid line with a dashed line on Fig demonstrates that, in the light emitting device 14 containing a light-diffusing element 5, the brightness is lowered to a greater extent in the region above the light-emitting element 1, compared with the light emitting device 15. The brightness level of the area directly above the light-emitting element 1, which is indicated by dotted lines in Fig, generates uneven brightness when in the area directly above the light-emitting element, the brightness is higher. Therefore, as described above, providing a light-diffusing element 5 in the light-emitting device 14 makes the formation of uneven brightness on the liquid crystal panel 6 is less likely.

Fig depicts a view in cross section illustrating the light emitting device 14 when the light falling on svetoprinimayuschego surface 2a reaches the light diffusing element 5 before it reaches the light emitting surface 2b.

As described above, in hoteisluca device 14, the light from the light-emitting element 1 is emitted as light L1, if he is radiated from the light emitting surface 2b before it reaches the light diffusing element 5. Thus, the characteristic scattering of light emitted by the light emitting element is improved. As shown in Fig, part of the light emitted by the light emitting element 1 reaches the light diffusing element 5 after contact with svetoprinimayuschego surface 2a. Then the light falls on the light emitting surface 2b, after which it radiates outward, as light L5, item 2 management luminous flux. As shown in Fig, after getting on svetoprinimayuschego surface 2a of the light from the light-emitting element 1 is refracted by the light-scattering element 5 in a direction that is parallel to the light axis Z. That is, the formation of light L5 reduces the effectiveness of improving the characteristics of the scattering of light from the light-emitting element 1.

To further improve the characteristics of light scattering by preventing the formation of such a light L5, the inventor has invented the following light-emitting device. Fig depicts a view in cross section of the light-emitting device 16 containing a light-diffusing surface 2e.

Item 2 management luminous flux of the light-emitting device 16 has a light to the diffusing surface 2e, which side (outer side) has a surface which is perpendicular with respect to the light axis Z, with which the light from the light-emitting element 1 is irradiated on the light emitting surface 2b. End surface 2f, which is vertical relative to the bottom surface 2c is formed on the outer part of the outer side of the light-diffusing surface 2e, contacting with the lower surface 2c.

As shown in Fig, the light emitted by the light emitting element 1, falling on svetoprinimayuschego surface 2a and reaches the light diffusing element 5 before it reaches the light emitting surface 2b, is scattered by the light-scattering surface 2e as light L6. Essentially, it is possible to prevent the generation of bright lines annular shape which is formed by such light as the light L5, shown on Fig, which is refracted in a direction that is parallel to the light axis Z. Therefore, light from the light-emitting element 1 can be dispersed more effectively. In particular, in accordance with the light-emitting device 16, the probability with which the light emitted from the liquid crystal panel, will form a bright line of a circular shape in a specific area is reduced. That is, installing a light-diffusing surface 2e on the barks prevent the formation of uneven brightness easier.

In the case when, despite the adoption of the above-mentioned countermeasures, formed a bright spot and/or bright line, the lens must be designed in accordance with the new standard brightness, which is set taking into account the formation of bright spots and/or bright lines. The new standard brightness is set by reducing the brightness of the local area under the Gaussian distribution, is formed when a bright spot and/or bright line.

The present invention is not limited to the aforementioned embodiments and can be changed by a specialist within the claims. An implementation option, based on a proper combination of technical means disclosed in different embodiments, implementation of the covered in the technical scope of the present invention.

As described above, the light emitting device of the present invention is a light-emitting device containing the light-emitting element and the control light flow to control the light emitted by the light emitting element, and the control light flux has (i) svetoprinimayuschego the surface from which the light emitted by the light emitting element, gets to control light output, and (ii) light-emitting surface from which the light incident on sitepronews the second surface, is emitted from the control light flux, where satisfies the above equation (2), where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, R(φ1) is a characteristic of the light distribution of a light emitting element which is a constant defined to satisfy ϕ1=0 when r=0, σ is a constant that indicates the characteristic scattering, and A receive through the above-mentioned equation (1).

Consequently, it is possible to provide a light emitting device that improves the characteristics of light scattering, using a common light-emitting element.

In addition, it is preferable that the light emitting device of the present invention was designed in such a way that if the characteristic of R(φ1) light distribution light-emitting element is close to lambertesca distribution satisfied the following equation (3):

where r t is aetsa length from the reference light axis of the light-emitting device plane, which is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, and σ is a constant that indicates the characteristic scattering.

In the light-emitting device, which satisfies equation (3), it is possible to convert the light emitted by the light emitting element on the basis of lambertuccio distribution, in light based on the Gaussian distribution on the above plane. This provides the possibility of providing the light-emitting device that improves the characteristics of light scattering, using a common light-emitting element.

And it is also preferable that the light emitting device of the present invention was designed in such a way that if Δϕ=7π/45, met the following equation (4):

1/25,8 ≤ θ12≤ 25,8 equation (4)

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference lights the y axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface from which light radiates outward and normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, the normal and the light-emitting surface at the point of emission of light, φ2is the angle between the reference light axis and the light emitted by the light emitting element, falling on svetoprinimayuschego surface and emitted from the light emitting surface outward and Δϕ=ϕ21

And it is also preferable that the light emitting device of the present invention was designed in such a way that if Δϕ ≤ π/6, met the following equation (5):

1/6,8 ≤ θ12≤ 6,8 equation (5)

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel to the tion to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface from which light radiates outward and normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, the normal and the light-emitting surface at the point of emission of light, and Δϕ=ϕ21.

In addition, it is preferable that the light emitting device of the present invention was designed in such a way that if Δϕ≤7π/36, met the following equation (6):

1/2,5 ≤ θ12≤ 2.5 equation (6)

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1 is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface from which light radiates outward and normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, the normal and the light-emitting surface at the point of emission of light, and Δϕ=ϕ21.

And it is also preferable that the light emitting device of the present invention was designed in such a way that if Δϕ ≤ 2π/9, met the following equation (7)

1/1,6 ≤ θ12≤ 1,6 equation (7)

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface, the light which radiates outward, and the normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, the normal and the light-emitting surface at the point of emission of light, and Δϕ=ϕ21.

And it is also preferable that the light emitting device of the present invention was designed in such a way that if Δϕ≤π/4, met the following equation (8):

1/1,2 ≤ θ12≤ 1.2 equation (8)

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface from which light radiates outward and normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, and the normal svatosp scause surface at the point of emission of light, and Δϕ=ϕ21.

Light-emitting device satisfies any of the above equations, allowing receives the reflection coefficient of the light emitted by the light emitting element is equal to 15% or less. This allows the light emitting device is further enhanced by the characteristic scattering of light.

And it is also preferable that the light emitting device of the present invention was designed in such a way as to control the light output was lower surface, which connects svetoprinimayuschego surface with the light emitting surface, and the element to prevent the admission of light to prevent the incidence of light emitted by the light-emitting element provided on the lower surface, the element of preventing reception of the light is reflecting element.

This causes the element to prevent the admission of light prevents light emitted by the light emitting element on the lower surface. Therefore, it is possible to prevent the generation of uneven brightness caused by the light-emitting device, when a light on the control light output from unwanted directions. In addition, by reflecting element may easily prevent the incidence of light, and the emitted light emitting element.

In addition, it is preferable that the light emitting device of the present invention was arranged so that the control light flux having a bottom surface that connects svetoprinimayuschego surface with the light emitting surface and the light-scattering member for scattering light reflected by the light emitting surface, returning to control light output, was provided on the bottom surface.

With this structure, it is possible to further disperse the light reflected and returned to the control light output, without external radiation from the light emitting surface. So it is possible to provide a light emitting device, which weakens the light, causing uneven brightness on the liquid crystal panel, namely outside (ambient) light, caused by the Fresnel reflection at the light emitting surface.

And it is also preferable that the light emitting device of the present invention was designed in such a way that in the control luminous flux wedge-shaped element serving as a light diffusing element was formed in the cross section including the reference light axis and formed a wedge resp is rsta, which is a light diffusing element located asymmetrically in relation to the reference light axis.

Light diffusing element can easily be formed in the form of wedge-shaped openings, which allows you to provide a light emitting device containing a light-diffusing element with a simple structure.

And it is also preferable that the light emitting device of the present invention was designed in such a way that the light diffusing element was provided in such a position, in which condenses the light emitted by the light emitting element, falling on svetoprinimayuschego the surface of the control light flux and reflected from the light emitting surface.

With this structure, it is possible to increase the amount of light that may be scattered by the light-scattering element. This allows you to provide a light emitting device which can improve the degree of scattering of external light, resulting in occurrence of uneven brightness on the liquid crystal panel, to reduce uneven brightness.

And it is also preferable that the light emitting device of the present invention was designed in such a way that on the side of the light-emitting surface from which light radiates outward, the control is placed luminous flux had a light-diffusing surface, which is perpendicular in relation to the reference light axis and the light-diffusing surface is provided in such a position, in which the light emitted by the light emitting element, falling on svetoprinimayuschego surface, reaching the light-scattering element and reaching the light emitting surface, is emitted by the control light flux outward.

In accordance with the above structure, the light emitted by the light-emitting element falls on svetoprinimayuschego surface, reaches the light diffusing element, is reflected by a light-diffusing surface, and then is emitted from the light emitting surface outside. In this regard, the light emitted by the light-emitting element falls on svetoprinimayuschego surface, and then reaches the light-diffusing surface to achieve a liquid crystal panel in a position which is away from the light axis. Therefore, it is possible to prevent deterioration of the characteristics of the scattering of light.

The lighting device in accordance with the present invention includes a light-emitting device.

Consequently, it is possible to provide a lighting device with high characteristic scattering, which is obtained by reducing the reflection coefficient is and the basis of the Fresnel reflection.

Options for implementation and concrete examples of implementation discussed in the foregoing detailed explanation serve solely to illustrate the technical details of the present invention, which should not be narrowly interpreted within the framework of these embodiments and concrete examples, and moreover, can be applied in many changes within the entity of the present invention, if such changes do not exceed the amount of available following claims.

Industrial applicability

The lighting device in accordance with the present invention can be used as a backlight for liquid crystal display devices. The lighting device in accordance with the present invention can accordingly be used, in particular, as a backlight for liquid crystal display devices of large size.

1. Light-emitting device containing
the light-emitting element, and the control light flow to control the light emitted by the light emitting element, and the control light flux contains (i) svetoprinimayuschego the surface from which the light emitted by the light emitting element, gets to control light output, and (ii) light is descending surface, with which the light incident on svetoprinimayuschego surface, is emitted by the control light flux, and satisfies the following equation (2):

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, R(φ1) is a characteristic of the light distribution of a light emitting element which is a constant defined to satisfy ϕ1=0 when r=0, σ is a constant that indicates the characteristic scattering, and get through the following equation (1):

2. The light emitting device according to claim 1, in which
if the characteristic of R(φ1) light distribution light-emitting element is close to lambertesca distribution, satisfies the following equation (3):

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance is from the control light flux in the direction which is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, and σ is a constant that indicates the characteristic scattering.

3. The light emitting device according to claim 1 or 2, in which
ifsatisfied the following equation (4):

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface from which light radiates outward and normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, and the normal light emitting by the Ergneti at the point of emission of light, ϕ2is the angle between the reference light axis and the light emitted by the light emitting element, falling on svetoprinimayuschego surface and emitted from the light emitting surface outward and Δϕ=ϕ21.

4. The light emitting device according to claim 1 or 2, in which
ifsatisfied the following equation (5)

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface from which light radiates outward and normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, the normal and the light-emitting surface at the point of emission of light, and Δϕ=ϕ21.

5. Light is sluchae device according to claim 1 or 2, in which case, ifsatisfied the following equation (6):

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface from which light radiates outward and normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, the normal and the light-emitting surface at the point of emission of light, and Δϕ=ϕ21.

6. The light emitting device according to claim 1 or 2, in which
ifmet the following equation (7)

where r is the length from the reference light axis of the light-emitting device plane, which is provided on defined the om distance from the control light flux in the direction which is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface from which light radiates outward and normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, the normal and the light-emitting surface at the point of emission of light, and Δϕ=ϕ21.

7. The light emitting device according to claim 1 or 2, in which case, ifsatisfied the following equation (8):

where r is the length from the reference light axis of the light-emitting device plane that is provided at a certain distance from the control light flux in a direction that is parallel in relation to the reference light axis, so as to be perpendicular in relation to the reference light axis, φ1is the angle between the light emitted by the light emitting element and the light axis, θ1 is the angle between the light passing from the receiving point of the light svetoprinimayuschego surface which directs the light to the point of light emission of the light emitting surface from which light radiates outward and normal svetoprinimayuschego surface at the point of reception of light, θ2is the angle between the light passing from the receiving point of light point of the light emission, the normal and the light-emitting surface at the point of emission of light, and Δϕ=ϕ21.

8. The light emitting device according to claim 1, in which
the control light flux has a bottom surface that connects svetoprinimayuschego surface with the light emitting surface, and the element to prevent the admission of light, which serves to prevent the incidence of light emitted by the light emitting element is provided on the bottom surface, the element of preventing reception of the light is reflecting element.

9. The light emitting device according to claim 1, in which
the control light flux has a bottom surface that connects svetoprinimayuschego surface with the light emitting surface, and a light-diffusing element serving for scattering light reflected by the light emitting surface, and returned to control light output, provided on the bottom surface.

<> 10. The light emitting device according to claim 9, in which
in the control luminous flux wedge-shaped element serving as a light scattering element, formed in the cross section including the reference light axis and the light diffusing element is axially symmetric with respect to the reference light axis.

11. The light emitting device according to claim 9, in which
light-diffusing element is provided in such a position, in which condenses the light emitted by the light emitting element, falling on svetoprinimayuschego the surface of the control light flux and reflected from the light-emitting surface.

12. The light emitting device according to claim 9, in which
on the side of the light-emitting surface from which light is emitted to the outside, the control light flux has a light-diffusing surface, which is perpendicular in relation to the reference light axis, and
a light-diffusing surface is provided in such a position, in which the light emitted by the light emitting element, falling on svetoprinimayuschego surface, reaches the light diffusing element, and then reaches the light emitting surface, is emitted by the control light flux outward.

13. The lighting device containing a light-emitting device according to any one of p is.1-12.



 

Same patents:

FIELD: physics.

SUBSTANCE: optical device has at least a first separate part (10) in form of a solid waveguide and an additional separate part (10") for connecting with the light-emitting diode (LED) light source. The first separate optical part (10) narrows in the direction z in a Cartesian coordinate system from the x-y plane, has longitudinal length in the direction y which is less than or equal to its longitudinal length in the directions z and x, and has first and second flat outer surfaces (14), lying oppositely in the x-z plane, third and fourth outer surfaces (16, 20) essentially lying opposite in the x-y plane, and fifth and sixth oppositely lying outer surfaces (7), arched and rounded relative the y-z plane. The third outer surface (16) has a rectangular shape. The fifth and sixth outer surfaces (7) are arched such that the fourth outer surface has size in the direction x less than the size of the third outer surface. The third (16), fifth and sixth (7) outer surfaces are primary surfaces for light output, and the light source (6) is entirely placed in the optical device opposite the light output surface (3, 23).

EFFECT: emission of focused light, having a given intensity distribution curve.

9 cl, 4 dwg

Dental illuminator // 2403494

FIELD: physics.

SUBSTANCE: illuminator has a housing in which there is a base in whose socket of which parabolic-shaped reflectors are screwed in. Powerful light-emitting diodes are fitted at the focus of the reflectors. The housing is closed by a transparent cover made from polycarbonate. There are light filters between the base and the cover. The light-emitting diodes are placed on the base symmetrically about the axis of the illuminator. Light-emitting diodes placed nearby have different spatial orientation based on the condition for obtaining a uniformly illuminated elliptical light spot, and the light-emitting diodes lying opposite each other have a reflection symmetric spatial orientation. There is a switch on the housing. The housing of the illuminator is joined to a suspension on which a unit for controlling brightness of the illuminator is mounted.

EFFECT: provision for a light spot which meets ISO 9680 requirements with simplification of the design and miniaturisation.

2 cl, 4 dwg

Illumination device // 2398996

FIELD: physics.

SUBSTANCE: illumination device has at least one light source and at least one diffuser. The diffuser consists of at least one scattering polymer element in whose transparent polymer mass there are transparent scattering bodies. The diffuser covers at least one or more light sources and is made in form an external housing component of the illumination device. The scattering bodies have a narrow Gaussian multimodal distribution.

EFFECT: simple design, fewer light sources required, more uniform illumination.

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Searchlight // 2302585

FIELD: lighting engineering.

SUBSTANCE: searchlight comprises Fresnel lens, reflector, lamp, and at least one additional Fresnel lens. The additional Fresnel lens is made of a lens with negative focus distance and, hence, is a dispersing lens having virtual focus point. The distance (a) between the Fresnel lens and reflector can be changed in correlation with the distance (b) between the lamp and reflector on the basis of the aperture angle determined for the light beam. The virtual focusing point of the dispersing lens is positioned out of the unit of the Fresnel lens, and it can be in coincidence with the focusing point of the reflector that is located far from the reflector. The Fresnel lens is made of a double-concave dispersing lens and has double lens with chromatically corrected characteristics of imaginary. The searchlight has Fresnel lens with integrated diffusion round window that is positioned at the Fresnel lens center and defines the system for mixing light which changes the ratio of the scattered light to the reflected light. The distance (b) can be controlled by moving the lamp with respect to the top of the reflector. The reflector is made of metallic or transparent dielectric material, preferably glass or/and plastic, and represents an ellipsoidal reflector. The Fresnel lens is coated with the dielectric interference layers that change the light spectrum passing through them. The auxiliary reflector is interposed between the Fresnel lens and reflector.

EFFECT: reduced sizes and efficiency.

20 cl, 8 dwg

FIELD: optics.

SUBSTANCE: proposed Fresnel-lens searchlight whose light beam is radiated at adjustable aperture angle has reflector, lamp, and at least one Fresnel lens. The latter is essentially negative focal length lens and, hence, it is negative lens with virtual focal point. Searchlight is designed for superposing focal point distant from reflector onto virtual focal point of Fresnel lens. Mentioned point of reflector is superposed on virtual focal point of Fresnel lens in searchlight position forming quasi-parallel path of beam. It is concave-concave negative lens incorporating duplex lens with chromatically corrected display characteristics. Searchlight Fresnel lens has circular integrated dissipating glass disposed at center of Fresnel lens thereby forming light mixing system that varies some fraction of dissipated light relative to fraction of diametrically and optically reflected light, that is, light mixing is function of Fresnel-lens searchlight position. Searchlight ellipsoidal reflector is made of metal or transparent, preferably dielectric, material in the form of glass and/or plastic. Fresnel lens is covered with a number of dielectric interference layers which function to vary spectrum of light passed through lens. Auxiliary reflector is disposed between Fresnel lens and main reflector.

EFFECT: reduced space requirement and mass compared with prior-art searchlights of this type.

19 cl, 6 dwg

FIELD: optics.

SUBSTANCE: micro-lens array includes micro-lens array of Fresnel lenses, provided with grooves, divided on reflecting and deflecting parts. Reflecting surface is engineering so that angle of light fall onto it exceeds angle of full inner reflection, and limit angle is computed from formula , and functional dependence between input and output beams and micro-lens parameters is described by formula , where α - input angle; β - output angle; γ - angle of inclination of reflecting surface; δ - maximal falling angle of light; ε - angle of inclination of deflecting surface; n1 - air deflection coefficient; n2 - lens material deflection coefficient. Output beam is formed in such a way, that central groove forms wide-angle zone, and next grooves from center to edge form a zone from edge to center.

EFFECT: increased beam divergence angle after micro-structured optics up to 170-180° (depending on source used) with efficiency of 80-90% and with fully controlled shape of output beam.

14 dwg

Illuminating device // 2295667

FIELD: illumination.

SUBSTANCE: device comprises light source and light scattering screen made of a colored plastic. The light source is composed of one or several light-emitting diodes. The screen transmits at least 35% and reflects 15% when the wavelength of radiation emitted by the diode reaches a maximum.

EFFECT: reduced sizes and power consumption.

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FIELD: the invention refers to searchlights.

SUBSTANCE: the searchlight with Frenel's lens with a regulated angle of aperture of coming out beam of light has preferably an elliptical reflector, a lamp and at least one Frenel's lens. The Frenel's lens has a diffuser, at that the diffuser is fulfilled of round form and is located only in the center of the Frenel's lens or the diffuser is fulfilled with changing degree of dispersion in such a way, that more powerfully dispersed fields are located in the middle of the diffuser and fields dispersed in a less degree are located along its edge. The Frenel's lens with the diffuser form a system of light displacement which changes the share of dispersed light in relation to the share of geometrically and optically projected light and thus changes correlation of light displacement as a function of installing a searchlight with Frenel's lens and also has a real point of focusing of a reflector removed from the reflector. The Frenel's lens is a flat-convex lens with chromatic corrected properties of projection. The covering of the Frenel's lens has a system of dielectric interference layers that changes the spectrum of light passing through it. An auxiliary reflector is installed between the Frenel's lens and the reflector.

EFFECT: provides high degree of effectiveness of obtaining of even coming out of light.

17 cl, 5 dwg

FIELD: light engineering.

SUBSTANCE: searchlight comprises Fresnel lens with controlled aperture of output beam, elliptical reflector, lamp, and at least one Fresnel lens. The distance between the Fresnel lens and reflector can be changed depending on the distance between the lamp and reflector according to the controlled angle of the aperture of the searchlight beam. The Fresnel lens has circular diffusion screen mounted at the center of the lens. The Fresnel lens and the screen define a system for shifting light, which allows the fraction of the diffused light to be changed, and the Fresnel lens has real point of focusing that can be set in coincidence with the focusing point of the reflector. The reflector focusing point is located far from the reflector. The Fresnel lens represents a flat-convex collecting lens and has double lens with chromatic-corrected projection properties. The coating of the Fresnel lens has a system of dielectric interference layer that changes the spectrum of the light passing through it. The auxiliary reflector is interposed between the Fresnel lens and reflector.

EFFECT: enhanced efficiency.

19 cl, 6 dwg

The invention relates to a light-diffusing means, intended for use in traffic lights, which is projected (almost parallel) light beam on unpainted or painted (red, yellow, green) surface with elementary light diffusing elements to scatter light within the boundaries of certain specified limits

FIELD: light engineering.

SUBSTANCE: searchlight comprises Fresnel lens with controlled aperture of output beam, elliptical reflector, lamp, and at least one Fresnel lens. The distance between the Fresnel lens and reflector can be changed depending on the distance between the lamp and reflector according to the controlled angle of the aperture of the searchlight beam. The Fresnel lens has circular diffusion screen mounted at the center of the lens. The Fresnel lens and the screen define a system for shifting light, which allows the fraction of the diffused light to be changed, and the Fresnel lens has real point of focusing that can be set in coincidence with the focusing point of the reflector. The reflector focusing point is located far from the reflector. The Fresnel lens represents a flat-convex collecting lens and has double lens with chromatic-corrected projection properties. The coating of the Fresnel lens has a system of dielectric interference layer that changes the spectrum of the light passing through it. The auxiliary reflector is interposed between the Fresnel lens and reflector.

EFFECT: enhanced efficiency.

19 cl, 6 dwg

FIELD: the invention refers to searchlights.

SUBSTANCE: the searchlight with Frenel's lens with a regulated angle of aperture of coming out beam of light has preferably an elliptical reflector, a lamp and at least one Frenel's lens. The Frenel's lens has a diffuser, at that the diffuser is fulfilled of round form and is located only in the center of the Frenel's lens or the diffuser is fulfilled with changing degree of dispersion in such a way, that more powerfully dispersed fields are located in the middle of the diffuser and fields dispersed in a less degree are located along its edge. The Frenel's lens with the diffuser form a system of light displacement which changes the share of dispersed light in relation to the share of geometrically and optically projected light and thus changes correlation of light displacement as a function of installing a searchlight with Frenel's lens and also has a real point of focusing of a reflector removed from the reflector. The Frenel's lens is a flat-convex lens with chromatic corrected properties of projection. The covering of the Frenel's lens has a system of dielectric interference layers that changes the spectrum of light passing through it. An auxiliary reflector is installed between the Frenel's lens and the reflector.

EFFECT: provides high degree of effectiveness of obtaining of even coming out of light.

17 cl, 5 dwg

Illuminating device // 2295667

FIELD: illumination.

SUBSTANCE: device comprises light source and light scattering screen made of a colored plastic. The light source is composed of one or several light-emitting diodes. The screen transmits at least 35% and reflects 15% when the wavelength of radiation emitted by the diode reaches a maximum.

EFFECT: reduced sizes and power consumption.

17 cl, 2 dwg

FIELD: optics.

SUBSTANCE: micro-lens array includes micro-lens array of Fresnel lenses, provided with grooves, divided on reflecting and deflecting parts. Reflecting surface is engineering so that angle of light fall onto it exceeds angle of full inner reflection, and limit angle is computed from formula , and functional dependence between input and output beams and micro-lens parameters is described by formula , where α - input angle; β - output angle; γ - angle of inclination of reflecting surface; δ - maximal falling angle of light; ε - angle of inclination of deflecting surface; n1 - air deflection coefficient; n2 - lens material deflection coefficient. Output beam is formed in such a way, that central groove forms wide-angle zone, and next grooves from center to edge form a zone from edge to center.

EFFECT: increased beam divergence angle after micro-structured optics up to 170-180° (depending on source used) with efficiency of 80-90% and with fully controlled shape of output beam.

14 dwg

FIELD: optics.

SUBSTANCE: proposed Fresnel-lens searchlight whose light beam is radiated at adjustable aperture angle has reflector, lamp, and at least one Fresnel lens. The latter is essentially negative focal length lens and, hence, it is negative lens with virtual focal point. Searchlight is designed for superposing focal point distant from reflector onto virtual focal point of Fresnel lens. Mentioned point of reflector is superposed on virtual focal point of Fresnel lens in searchlight position forming quasi-parallel path of beam. It is concave-concave negative lens incorporating duplex lens with chromatically corrected display characteristics. Searchlight Fresnel lens has circular integrated dissipating glass disposed at center of Fresnel lens thereby forming light mixing system that varies some fraction of dissipated light relative to fraction of diametrically and optically reflected light, that is, light mixing is function of Fresnel-lens searchlight position. Searchlight ellipsoidal reflector is made of metal or transparent, preferably dielectric, material in the form of glass and/or plastic. Fresnel lens is covered with a number of dielectric interference layers which function to vary spectrum of light passed through lens. Auxiliary reflector is disposed between Fresnel lens and main reflector.

EFFECT: reduced space requirement and mass compared with prior-art searchlights of this type.

19 cl, 6 dwg

Searchlight // 2302585

FIELD: lighting engineering.

SUBSTANCE: searchlight comprises Fresnel lens, reflector, lamp, and at least one additional Fresnel lens. The additional Fresnel lens is made of a lens with negative focus distance and, hence, is a dispersing lens having virtual focus point. The distance (a) between the Fresnel lens and reflector can be changed in correlation with the distance (b) between the lamp and reflector on the basis of the aperture angle determined for the light beam. The virtual focusing point of the dispersing lens is positioned out of the unit of the Fresnel lens, and it can be in coincidence with the focusing point of the reflector that is located far from the reflector. The Fresnel lens is made of a double-concave dispersing lens and has double lens with chromatically corrected characteristics of imaginary. The searchlight has Fresnel lens with integrated diffusion round window that is positioned at the Fresnel lens center and defines the system for mixing light which changes the ratio of the scattered light to the reflected light. The distance (b) can be controlled by moving the lamp with respect to the top of the reflector. The reflector is made of metallic or transparent dielectric material, preferably glass or/and plastic, and represents an ellipsoidal reflector. The Fresnel lens is coated with the dielectric interference layers that change the light spectrum passing through them. The auxiliary reflector is interposed between the Fresnel lens and reflector.

EFFECT: reduced sizes and efficiency.

20 cl, 8 dwg

Illumination device // 2398996

FIELD: physics.

SUBSTANCE: illumination device has at least one light source and at least one diffuser. The diffuser consists of at least one scattering polymer element in whose transparent polymer mass there are transparent scattering bodies. The diffuser covers at least one or more light sources and is made in form an external housing component of the illumination device. The scattering bodies have a narrow Gaussian multimodal distribution.

EFFECT: simple design, fewer light sources required, more uniform illumination.

14 cl, 5 dwg

Dental illuminator // 2403494

FIELD: physics.

SUBSTANCE: illuminator has a housing in which there is a base in whose socket of which parabolic-shaped reflectors are screwed in. Powerful light-emitting diodes are fitted at the focus of the reflectors. The housing is closed by a transparent cover made from polycarbonate. There are light filters between the base and the cover. The light-emitting diodes are placed on the base symmetrically about the axis of the illuminator. Light-emitting diodes placed nearby have different spatial orientation based on the condition for obtaining a uniformly illuminated elliptical light spot, and the light-emitting diodes lying opposite each other have a reflection symmetric spatial orientation. There is a switch on the housing. The housing of the illuminator is joined to a suspension on which a unit for controlling brightness of the illuminator is mounted.

EFFECT: provision for a light spot which meets ISO 9680 requirements with simplification of the design and miniaturisation.

2 cl, 4 dwg

FIELD: physics.

SUBSTANCE: optical device has at least a first separate part (10) in form of a solid waveguide and an additional separate part (10") for connecting with the light-emitting diode (LED) light source. The first separate optical part (10) narrows in the direction z in a Cartesian coordinate system from the x-y plane, has longitudinal length in the direction y which is less than or equal to its longitudinal length in the directions z and x, and has first and second flat outer surfaces (14), lying oppositely in the x-z plane, third and fourth outer surfaces (16, 20) essentially lying opposite in the x-y plane, and fifth and sixth oppositely lying outer surfaces (7), arched and rounded relative the y-z plane. The third outer surface (16) has a rectangular shape. The fifth and sixth outer surfaces (7) are arched such that the fourth outer surface has size in the direction x less than the size of the third outer surface. The third (16), fifth and sixth (7) outer surfaces are primary surfaces for light output, and the light source (6) is entirely placed in the optical device opposite the light output surface (3, 23).

EFFECT: emission of focused light, having a given intensity distribution curve.

9 cl, 4 dwg

FIELD: physics.

SUBSTANCE: light-emitting device (10) has a light-emitting element (1) and an element (2) for controlling light emitted by the light-emitting element (1). The light flux control element (2) has (i) a light-receiving surface (2a) on which light emitted by the light-emitting element (1) falls, and (ii) a light-emitting surface (2b).

EFFECT: high uniformity of light intensity, low reflection coefficient due to Fresnel reflection, improved scattering characteristics.

13 cl, 21 dwg

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