Optical sensor (options), lens (options) and the optical adapter unit (options)

 

(57) Abstract:

The invention relates to devices designed for recording and reproducing information on the recording media, representing the disc, card or tape. The invention is an optical sensor in the optical device that is compatible with many optical recording media of different thickness, containing a light source for emitting a light beam, a lens for focusing a light beam emitted from the light source, a single light spot on the surface of the information recording one of the many optical recording media, and a photocell for detecting the light beam transmitted through the lens after reflection from the surface of the information recording one of the many media accounts, which focuses the light spot. The lens has an internal area of the annular lens area and the outer area with the center at the top. The annular lens area has an annular shape and separates an inner area from the outer area. The inner zone, the annular lens area and the outer area are aspheric shape of the surface to focus the light beam that has passed through the inner area and the outer area, the nkiye the first optical recording medium, and to disperse the light passing through the annular lens area, so that the scattered light is not focused on the surface of the information recording thin optical disk. The information read from the surface of the information recording thick optical disk by focusing the light transmitted through the inner area and the annular lens area, a single light spot, and scattering the light transmitted through the outer area so that the information cannot be read from the surface of the information recording thick optical disk. The invention allows recording and reproduction of information on the surface of the information recording media, optical recording in various formats, such as digital multifaceted disc, recordable CD-ROM, rewritable CD-ROM, CD-ROM and laser disc. 6 C. and 57 C.p. f-crystals, 11 tab., table 1.

The present invention relates to the optical sensor containing a lens with a function of forming an optical spot on the surface of the information recording media, optical recording in various formats, and in particular, to the optical sensor with a lens that is compatible for use in a multitude of optical fiber is savemy CD (SCD) (CD-R) rewritable CD (PKD) (CD-RW) CD (CD) (CD) and a laser disk (LD) (LD).

The recording media for recording and reproducing information such as image, sound, or data, is a disc, card or tape. However, mainly used disc-shaped recording media. Previously, optical disk systems have been developed in the form of LD, KD and CMSD. However, when the shared optical discs having, respectively, different formats, such as CMD, SCD, KD, PKD and LD, due to changes of the disk thickness and the wavelength of the optical distortions occur. Thus, actively studied optical sensor, which is compatible with various disc formats and which removes the above-mentioned optical distortion. The result of this examination is made of the optical sensor, which is compatible with various formats.

Fig. 1A and 1B show a portion of a conventional optical sensor, which is compatible with various formats. Fig. 1A shows the case where light is focused on a thin optical disk, and Fig. 1B represents the case where light is focused on a thick optical disk. In Fig. 1A and 1B, reference character 1 denotes a holographic lens. POS. 2 denotes PR is Etowah stream 4, coming from a not shown light source, experiencing the diffraction by a grating (mesh) structure 11 holographic lens 1, respectively, for education redirecionado light beam 40 zero-order and diffracted light beam 41 of the first order. Nederevyanny light beam 40 zero order is focused by the lens 2 on the surface of the information recording optical disc 3a. Dragirovaniya light beam 41 of the first order is focused by the lens 2 on the surface of the information recording optical disk 3b. Therefore, the optical sensor shown in Fig. 1A and 1B, uses nederevyanny light beam 40 of the first order and dragirovaniya light beam 41 of the first order for recording information on optical discs 3a and 3b respectively different thicknesses or for reading information from the disks.

Another conventional method is considered in application laid Japan N 07-302437, published on 14 November 1995. Lens discussed in this publication device, the optical head is measured from the center of the lens, the odd-numbered (odd-numbered zones) with a focus coinciding with the surface of the information recording thin optical disk, and even the area (even, in the case of the thin optical disk drive for reading information from a thin optical disk is used, the light beam that has passed through the odd-numbered (odd) lens. However, in the case of a thick optical disk drive for reading information from a thick optical disk uses a light beam that has passed through the even-numbered (even-numbered zones) of the lens.

However, since the optical sensor shown in Fig. 1A and 1B, divides the incident light beam on the light beam of the zero order light beam of the first order, the light utilization efficiency is reduced, i.e., since the incident light is divided by the lens 1, the light beam of the zero order light beam of the first order, for recording information on an optical disk or reading information from an optical disc is used, only the light beam of the zero order or the light beam of the first order, and an optical sensor uses only 15% or so of the incident light, thereby reducing the light utilization efficiency. In addition, in accordance with the thickness of the optical disk, only one light beam of the zero order and the light beam of the first order reflected from the respective optical without information acts as noise for the light, containing information. The above problem can be overcome by processing the holographic lens 1 lens device. However, in the manufacture of a holographic lens 1, the etching process for the production of thin holographic patterns requires high precision. Thereby increasing the production cost.

In the case of examined application laid Japan N 7-302437 used the light passing through only one of the odd (odd) and the even-numbered (even) fields. The result is reduced efficiency of utilization of light. In addition, since the number of tricks always two light without information acts as a noise during detection of the light, which complicates the detection information from the light beam reflected from the optical disk.

Disclosure of the invention

In order to solve the above problem, the present invention is the provision of an optical sensor, which has an excellent feature detection signal regardless of the format it to disk.

Another objective of the present invention is to provide a lens that is used together with at least two substrates having respectively different thicknesses.

The above and other objectives of the present invention are achieved by providing an optical sensor, which is compatible with many optical recording media, while the optical sensor includes at least one light source, the lens function of focusing light emitted by a light source, an optimal light spot on the surface of the information recording one of the many optical recording media, and a photocell for detecting the light beam transmitted through the lens after it is reflected from the surface of the information recording optical recording medium, on which is focused the light spot. The lens has an internal area of the annular lens area and the outer area, which are separated by the annular lens area in the form of a ring centered at the top, and the inner zone, the annular lens area and the outer area have an aspherical surface shape for focusing light transmitted through the inner area and the outer area, into a single light spot, which can read information from the surface of the information recording relatively thin first optical recording medium and the scattered light that has passed through the circular Lisova is the recording medium during playback of the first optical recording medium with a thin substrate. The lens focuses the light passing through the inner zone and the annular lens area, a single light spot, which can read information from the surface of the information recording relatively thick second optical recording media, and the scattered light that has passed through the outer zone, unable to focus on the second optical recording medium with a thick substrate during playback, this second optical recording media.

The above and other objectives can be further achieved by the provision of the lens, which uses at least two substrates having respectively different thicknesses for light usage, and the lens includes an inner zone, an annular lens area and the outer area, which are separated by the annular lens area in the form of a ring centered at the top, and the inner zone and the outer zone have an aspherical surface shape for focusing light transmitted through the inner area and the outer area, into a single light spot, which can read information from the surface of the information recording relatively thinner first substrate. The annular lens area has a different aspheric surface shape for receiveack that last light is unable to focus on the first substrate with a smaller thickness. The lens focuses the light beam that has passed through the inner area and the annular lens area, a single light spot, which can read information from the surface of the information recording relatively thicker second substrate, and scatters the light passing through the outer lens area so that the last light cannot focus on the second substrate with greater thickness.

Brief description of drawings

These and other objectives and advantages of the invention will become apparent and better understood from the following description of preferred embodiments, taken together with the accompanying drawings.

Fig. 1A and 1B show a conventional optical sensor with holographic lens and the refractive lens.

Fig. 2A shows that the lens according to the first and second variants of execution of the present invention, forms an optical spot on the surface of the information recording thin optical disk.

Fig. 2B shows that the lens according to the first and second variants of execution of the present invention, forms an optical spot on the surface of the information recording thick optical disk.

Fig. 2C shows the lens sogny part of the lens - the inner zone, the annular lens area and the outer area.

Fig. 2D shows in enlarged scale a part of the annular lens area for the perfect ring lens according to the present invention.

Fig. 3A shows a longitudinal spherical lens distortion, according to the first variant implementation of the present invention, during the read Tolstoy optical media.

Fig. 3B shows the distortion of the wavefront of the lens according to the first variant implementation of the present invention, during the read Tolstoy optical media.

Fig. 4 shows the lens according to the first variant implementation of the present invention.

Fig. 5 shows in enlarged scale a part of the ring of the objective lens according to the second variant of implementation of the present invention.

Fig. 6 shows the optical system of the first type optical sensor with a single light source that includes a lens according to the first and second variants of execution of the present invention.

Fig. 7 shows a modification of the optical system of the optical sensor shown in Fig. 6.

Fig. 8A shows the second type of optical the options for the implementation of the present invention.

Fig. 8B shows a modification of the optical sensor shown in Fig. 8A.

Fig. 9 shows a second type of optical sensor with lens, two light sources and two solar cells according to the first and second variants of execution of the present invention.

Fig. 10 shows the distribution of the light fluxes in the solar cell, when read thin optical disk using an optical sensor according to the first and second variants of execution of the present invention.

Fig. 11 shows the distribution of the light fluxes in the solar cell, when read thick optical disk using an optical sensor according to the first and second variants of execution of the present invention.

A detailed description of the preferred embodiments

Consider now in detail the present preferred embodiments of the present invention, examples of which are presented on the accompanying drawings, in which everywhere the same reference items refer to the same elements. These steps described below to explain the present invention with reference to the drawings.

Fig. 2A-2D show the lens, according to Mr. the when reading the thin optical disk 30A. Fig. 2B shows the optical path when the working distance of the lens 20 is "WD2" when reading a thick optical disk 30B. Fig. 2C shows the lens 20 when viewed from the light source, where it is seen that the lens surface 22 lying on the side of the lens 20 facing the light source, is divided into an inner zone (middle zone) A1, the annular lens area (staging area) A2 and the outer area (peripheral area) A3. Fig. 2D is an enlarged view of part of the annular lens area A2 of the lens 20, where the lens 20 is made perfect.

The lens 20 according to the first variant implementation of the present invention, the lens surface 22, which lies on the side of the lens 20 facing the light source, is divided into an inner area A1 and the outer area A3 of the annular lens area A2 having such a ring-shaped appearance as elliptical or round shape with the vertex V1 of the lens surface 22 in the middle. Here, the vertex V1 is a point where the lens axis 20 intersects the lens surface 22 on the side of the light source. The inner area A1 and the outer area A3 has an aspheric shape that is optimized for the best education focus on the surface 31A informationreference distortion on the surface 31B of the information recording thick optical disk 30B, but in order to have a sufficiently small spherical distortion to read the thick optical disk 30B. In particular, the inner area A1 has a numerical aperture NA, which meets the following equation (1) for optimized optical spot to play the thick optical disk 30B, such as an existing CD. The inner area A1, the annular lens area A2 and the outer area A3, respectively, are near the axial zone, the intermediate axial zone and the far axis area of the incident light.

When using light with a wavelength of 650 nm, it is preferable that the numerical aperture NA of the lens 20 were 0.37 or more to play existing CD.

0,8/NA spot size (1)

Here is the wavelength of light and NA is the numerical aperture of the inner area A1. Assume that the working distance of the lens 20 is "WD1", when the best focus is formed by the inner area A1 and the outer area A3, the light (rays) passing through the inner area A1 and the outer area A3, forms an optimal spot on the surface 31A of the information recording thin optical disk 30A with respect to the working distance WD1 and does not form spherical distortion. In addition, Koki disk 30B, such as a relatively thick KD. This method was described in a patent application Korea N 96-3606. However, for playback from an optical disc, such as the LD among the existing optical disc that uses a smaller spot size, the required numerical aperture not less than 0.4. To raise NA above 0,37 when the annular lens area A2 has an aspherical surface that extends aspherical surface shape of the inner area A1, the light passing through the annular lens area A2 when playing LD, forms a stronger optical distortion to such an extent that LD cannot be reproduced. Therefore, the annular area A2 corrects such optical distortion and has an aspherical surface shape, by which the light passing through the annular lens area A2, corrects the optical distortion in the best position, where the inner area A1 is formed focus.

Fig. 2B shows the optical path when the reproduction of the thick optical disk 30B and shows that the light passing through the outer area A3, does not form a spot on an optical disc and dispersed, and the light passing through the zones A1 and A2, is focused on the surface 31B of the large disk 31B. Meanwhile, when the working distance obamaloney recording optical disk 30A. The solid line in Fig. 2A shows an optical path of light passed the inner area A1 and the outer area A3, when the working distance is "WD1". The dashed lines show the optical path of light passed annular lens area A2, in which the light is scattered.

Fig. 3A is a graph showing distortion to explain the working distance and longitudinal optical spherical lens 20 when reading a thick optical disk 30B. Since the inner area A1 has a spherical distortion when the lens 20 reproduces the thick optical disk 30B, the lens 20 of the optical refocused, i.e., subject to a working distance in order to have the minimum value of the spherical distortion. The coefficient of W40spherical distortion caused by the difference of the disk thickness between the thin optical disk 30A and the thick optical disk 30B, meets the following equation (2).

(2)

In the General case, optical distortion, which includes spherical distortion (spherical aberration), is expressed by the following equation (3).

W = W20h2+ W40h4(3)

Here W20is the coefficient of defocus, and h Ave abusea equation (4).

...(4)

Therefore, the condition of the coefficient of defocus, which minimizes optical distortion, is W20= -W40and the actual amount of defocus obeys the following equation (5).

...(5)

Here the variation of the numerical aperture (NA) of the internal zone, the index (n) of refraction of the disk and the thickness (d) of the disk is: NA = 0,38, n = 1,58, and d = 0.6 mm If the annular lens area A2 so designed that formed the best spot, and in relation to the thick optical disk 30B, rostkoviana 8.3 μm, no spherical distortion, you can get a graph of the longitudinal spherical distortion, as shown in Fig. 3A. In this case, the difference between the focal length, formed by the inner area A1, and a focal length, formed by the annular lens area A2 becomes of 8.3 μm due to the amount of defocus of 8.3 μm on the optical axis. The total focal length equal 3,3025 mm for the inner area A1 and 3,3111 mm for the annular lens area A2, according to calculations by a commercial program (software) for optical applications. The size of 8.3 μm is the result of hand-made calculations of the third order, and the 8.6 ám represents the programme (software).

If the working distance of the lens 20 is changed from "WD1" to "WD2", which reduces optical distortion of light transmitted through the annular lens area A2, practically to zero, then the light passing through the annular lens area A2, forms an optical path shown in Fig. 2B, solid lines, and forms the optimal spot on the surface 31B of the information recording thick optical disk 30B. When the working distance WD2 is the optimum working distance for playback of a thick optical disk 30B, the annular lens area A2 increases the light utilization efficiency, but also increases the numerical aperture. In this case, the inner area A1 retains the spherical distortions, which are small enough to play the thick optical disk 30B. Spherical distortion generated in the inner area A1, minimized, and the overall distortion of the wave front are about 0.07 (RMS). Thus, the light passing through the inner area A1 and the annular lens area A2, forms a spot with a size reduced by 15% or more without increasing the optical distortion on the surface 31B of the information recording thick optical disk 30B compared with the case where the ring l is aspraiseworthy optical recording medium, such as the existing LD requiring high density, and KD. In this case, the light passing through the outer area A3, scatters and does not affect the optical spot formed on the surface 31B of the information recording thick optical disk 30B. The optical path of light passed through the outer area A3 shown in dotted lines in Fig. 2B. Thus, on the surface 31B of the information recording it is possible to form a single optical spot. Examples of working distances described above and shown in Fig. 2A and 2B constitute WD1 = 1,897 mm and WD2 = 1,525 mm

When reading the recorded information of the thin optical disk 30A uses light with a relatively short wavelength, while the thick optical disk 30B uses light with a short wavelength and with a relatively long wavelength. Therefore, when the thin optical disk 30A is CMSD, and the thick optical disk 30B is a KD, LD, PKD or SCD, the inner area A1 and the outer area A3 has an aspherical surface shape that is optimized for the surface of the information recording CMSD, and the inner area A1 and the annular lens area A2 have an aspherical surface shape, where the distortion is corrected and working distance wholesale LD or PKD or SCD. The annular lens area A2 among the areas A1, A2 and A3 has an aspherical surface shape defined by the following equation (6), expressing this aspherical surface.

< / BR>
In the above equation, the function Z represents the distance from the surface perpendicular to the optical axis and passing through the vertex V1 of the lens 20, the lens surface 22 lying on the side of the lens 20 facing the light source. The variable "h" represents the distance from the axis of the lens 20 to a particular point perpendicular to the axis. The constant R represents the curvature, which is becoming the standard for determining the aspheric shape of the surface, Zshiftrepresents a parameter that is introduced to Express the difference between the annular lens area A2 and the inner area A1. Since equation (6) known in the art, its detailed description is omitted. The annular lens area A2 has a protruding shape or depth form compared to the inner area A1 and the outer area A3. The annular lens area A2 of the protruding shape is enlarged and shown in Fig. 2D. The aspherical surface shape inherent in the inner area A1 and the outer area A3 can be expressed removing components Z

The data obtained for the optimum aspherical surface shapes for areas A1, A2 and A3 are presented in table (at the end of the description).

When the aspheric shape of the surface areas A1, A2 and A3 are determined by equation (6) and the above table, the imaginary surface, which stands for aspherical surface of the annular lens area A2, indicated by the dotted line in Fig. 4, it becomes farther from the vertex V1 of the lens 20 than the aspherical surface of the inner area A1.

However, to facilitate the formation of zones A1, A2 and A3 with aspherical surface forms on the lens surface lying on the side facing the light source, it is preferable that the annular lens area A2 is processed after processing the first inner area A1 and the outer area A3. Thus, the annular annular lens area A2 is the difference in the contact area with the inner area A1 or the outer area A3.

Fig. 4 shows objetivos lens area A2. Fig. 5 shows the lens 20', which is processed so that the difference occurred in the area where the annular lens area A2 is in contact with the outer area A3. Such differences create distortions due to the difference of the light paths between the light passing through the inner area A1, and the light passing through the annular lens area A2. The difference is the height through which the optical distortion due to the difference of light paths between the light passing through the inner area A1, and the light passing through the annular lens area A2 can be removed for a light beam with a relatively long wavelength, emitted from the light source, or light beam to reproduce a thick optical disk. In particular, this height difference is determined so that the difference of the light paths between the light passed through the annular lens area A2, and the light passed through the inner area A1 of the lens 20, became an integral multiple of the wavelength of the used light, as shown in Fig. 3B. The height difference is determined to be a value by which the optical distortion due to the difference of light paths could be removed by considering the offset Zshiftin equation (6) and the width of the annular lens area A2. Preferred is CLASS="ptx2">

Fig. 6 shows the first type of optical sensor with a single light source that includes a lens 20 or 20', according to the first and second variants of execution of the present invention. The optical sensor shown in Fig. 6 has a conventional optical system, which is compatible with optical discs of various different formats, using the same wavelength of light, through the use of the lens 20 or 20', according to the first or second options, the implementation of the present invention. The optical source 41 emits a laser beam with a specific wavelength. The photocell 43 is constructed so that the light passing through the outer area A3 of the lens 20 or 20', not detected during playback of a thick optical disk 30B. I.e. photocell 43 is constructed so that during reproduction of information with a thick optical disk 30B detected only the light passing through the inner area A1 and the annular lens area A2 of the lens 20 or 20'.

For clarity, will be described the case where the optical sensor according to Fig. 6, includes a lens 20 or 20', and the optical source 41 emits light with a wavelength of 650 nm. Light rays with a wavelength of 650 nm emitted from the source is nye's rays are almost parallel (colimits) using a collimating lens 70. Because light rays incident from the light source in the direction of the lens 20 or 20' can be made almost parallel light beam by the collimating lens 70, a read operation can be performed more stably. When the playback operation in respect of a thin disk 30A, for example, CMSD, light rays that have passed through the collimating lens 70, the focus lens 20 or 20' in the form of a spot beam on the surface 31A of the information recording thin disk 30A. In this case, the lens 20 or 20' has a working distance WD1 and shown by the solid line in Fig. 6 in position A. Therefore, the rays with a wavelength of 650 μm from the light source shown in Fig. 6 as a solid line. Light reflected from the surface 31A of the information recording thin disk 30A passes through the lens 20 or 20' and the collimating lens 70, and then falls on the beam splitter 42 of the beam. The beam splitter 42 beam transmits about 50% of incident light, and missed the light beam is focused on the photocell 43 through the lens 44 of the photocell. Here the light passing through the inner area A1 and the outer area A3 of the lens 20 or 20', forms a specific spot size on the surface 31A of the information recording thin disk 30A, through chagasi through the annular lens area A2 of the lens 20 or 20', forms a band in a dispersed form in a position rejected by about 5 μm on the disk 31B from the position of the spot formed by the light passed through the inner area A1 and the outer area A3. Thus, the light passing through the annular lens area A2, is not detected by the photocell 43 and act as noise for efficient playback signal during playback data from the thin disk 30A.

When the playback operation with the thick disk 30B, for example, CD or LD, the light passing through the collimating lens 70 is focused by the lens 20 or 20' in the form of a spot beam on the surface 31B of the information recording thick disk 30B in position B. In this case, the lens 20 or 20' has a working distance WD2" and is shown in dashed lines in Fig. 6. Therefore, the light beam forms an optical path shown in Fig. 6 by the dashed line. Here, the light passing through the inner area A1 and the annular lens area A2 of the lens 20 or 20', forms on the surface 31B of the information recording thick disk 30B spot size through which information can be read from the surface 31B of the information recording thick disk 30B. Meanwhile, the light passing through the outer area A3 lens the spot, formed by light having passed through the inner area A1 and the annular lens area A2. Thus, the photocell 43 can read the thick disk 30B, using the light passing through the inner area A1 and the annular lens area A2 of the lens 20 or 20'.

More, the light passing through the inner area A1, forms a spherical distortion on the surface 31B of the information recording thick disk 30B. However, these spherical distortions are sufficiently small value for the read signal with a thick disk 30B, and minimized optical distortion saved defocusing of light due to the magnitude of the spherical distortion on the optical axis. The curvature of the lens and the aspherical coefficient of the surface of the annular lens area A2 are adjusted for non-distorting optical system in a state where the working distance is adjusted to approximately 10 μm, so that an additional spherical distortion is not formed. Accordingly, the numerical aperture is increased without increasing the optical distortion, and the spot size decreases. Thus, it can play existing optical discs, such as LD, requiring higher density than KD. Note, to play LD ne the desired spot size of about 0.9 μm. As a result, the present invention can reproduce a variety of optical discs, such as CMD, LD and KD using a simple optical sensor.

Fig. 10 shows the distribution of light in the photocell 43, when the disc 30A is reproduced, according to the first and second variants of execution of the present invention. In Fig. 10 the dark portions caused by the light having passed through the inner area A1 and the outer area A3 of the lens 20 or 20', and are detected as an effective playback signal. Bright parts and dark parts represent that the light passing through the annular lens area A2 of the lens 20 or 20', is not detected by the photocell 43 and is not detected as an effective playback signal. Fig. 11 shows the distribution of light beams in the solar cell 43, when the information from the thick disk 30B is reproduced using the lens 20 or 20', according to the present invention. The inscription "B1" shows the distribution of the light transmitted to the photocell through the inner area A1, B2 shows the distribution of the light transmitted through the annular lens area A2, and B3 shows the distribution of the light transmitted through the outer area A3. Light, forming raspredeliteli distribution B3, is not detected as an effective signal playback.

Fig. 7 shows a modification of the optical system of the optical sensor shown in Fig. 6. In Fig. 7 unit 40 includes a source 41 of the light and the photocell 43, which form a single unit. A holographic beam splitter 50 beam is a polarization hologram with high optical efficiency and receives high optical efficiency due to the use of a quarter-wave plate 60. Preferably, the polarization hologram would change the total hologram when a quarter-wave plate 60 is not used. Light rays with a wavelength of 650 nm from the source 41 of the light passing through the holographic beam splitter 50 of the beam and the quarter wave plate 60, and then become parallel rays by using a collimating lens 70. The lens 20 or 20' focuses the light incident from the collimating lens 70 on the surface 31A of the information recording thin optical disk 30A or on the surface 31B of the information recording thick optical disk 30B in the form of optical spots. Detailed description of the optical sensor shown in Fig. 7 will be omitted, because the lens 20 or 20' is the same as focusing on the photocell 43 through a holographic beam splitter 50 beam.

Fig. 8A shows an optical sensor having a lens 20 or 20', two springs 41 and 45 of the light and a single photocell 43 for the first and second embodiments of the present invention. Source 41 emits light of a laser beam with a wavelength of 650 nm, and the source 45 light emits a laser beam with a wavelength of 780 nm. A light source with a wavelength of 780 nm should be used for discs such as CD, PKD, LD or SCD, and the light source with a wavelength of 650 mm should be used for disk type CMD, KD or PKD. When using a source 41 of the light emitted by the light rays forming the optical path shown in Fig. 8A solid line, and in this case, the lens 20 or 20' shown in solid lines in position A. When using a source 45 of the light emitted by the light rays form an optical path shown by a dotted line, and in this case, the lens 20 or 20' is shown in dashed lines in position B. Optical spot focused on a thick optical disk 30B or thin optical disk 30A lens 20 or 20', the same as shown in Fig. 6.

The beam splitter 46 beam is a separating color splitter, which transmits the light given from the source 41 of the light, and reflects light the l 47 beam. Polarization splitter 47 beam has an optical characteristic which transmits or reflects linearly polarized beams, operating at wavelengths of 650 nm and 780 nm. Polarization splitter 47 transmits the light beam incident from the beam splitter 46 of the beam, and passing the light through a quarter-wave plate 60 becomes a beam with circular polarization. The beam with circular polarization is focused by lens 20 or 20' on the surface of the information recording thin optical disk 30A or thick optical disk 30B. The light beam reflected from the surface of the information recording passes through the lens 20 or 20' and the collimating lens 70, and then becomes linearly polarized using a quarter-wave plate 60. Linearly polarized light is reflected from the polarization beam splitter 47 of the beam, and the reflected light is focused on the photocell 43 lens photocell 44. Polarization splitter 47 beam is replaced by a beam splitter, which partially transmits and reflects incident light, when the quarter-wave plate 60 is not used.

You can use an optical sensor having a lens, two light sources, a single photocell and the beam splitter 42 of the beam in WITTEM replace the beam splitter in the form of a cube beam splitter in the form of a plate. In addition, two springs 41 and 45 of the light looking in opposite directions to each other, and the photocell is looking at an angle 90othe springs 41 and 45 of the world. This is opposed to the optical sensor shown in Fig. 8A, in which the springs 41 and 45 light look under right angles relative to each other, and the photocell 43 is looking in the opposite direction of the source 45 of light and at a right angle to the source 41 of the light.

Fig. 9 shows an optical sensor having a lens 20 or 20', two springs 41 and 45 of the light and two photocell 83 and 105 according to the first and second variants of execution of the present invention. In Fig. 9 source 41 emits light (light) rays with a wavelength of 650 nm, a photodetector 83 corresponds to the source 41 of the light, and the source 41 to the light and photocell 83. Reference position 45 and 105 denotes a light source and photocell, respectively, for light with a wavelength of 780 nm, and 110 is a beam splitter. Other optical elements are the same as shown in Fig. 8A and 8B. Because the optical sensor shown in Fig. 9, can be understood on the basis of the description provided for Fig. 8A and 8B, a detailed description will be omitted.

To the sheet clear what lens according to the present invention can be used in the microscope or in the device, which measures optical sensors.

As described above, the optical sensor according to the present invention, compatible with discs having various different formats without regard to the thickness or density of the disc, and the disc you are using, you can get a great signal reading. In addition, the lens according to the present invention, can be manufactured with low cost, using injection molding. In particular, when the compatible optical drive uses two or more wavelengths, the optical sensor can be performed using a single lens and a single photocell.

Although it specifically describes only some of the execution of the invention, it is clear that it is possible to make numerous modifications without departing from the spirit and scope of the invention.

1. The optical sensor in the optical device that is compatible with many optical recording media of different thickness, containing a light source for emitting a light beam, a lens for focusing a light beam emitted from the light source, a single light spot h is the pit of the light beam, passed through the lens after reflection from the surface of the information recording one of the many media accounts, which focuses the light spot, wherein the lens has an internal area of the annular lens area and the outer area with the center at the top, and the annular lens area has an annular shape and separates an inner area from the outer zone, the inner zone, the annular lens area and the outer area are aspheric shape of the surface to focus the light beam that has passed through the inner area and the outer area, into a single light spot, through which information is read from the surface of the information recording one of the optical recording medium to disperse the light passing through the annular lens area formed between the inner area and the outer area, so that the scattered light is not focused on the surface of the information recording, if the one optical recording medium is the first optical recording medium with a first thickness, and to focus the light passing through the inner zone and the annular lens area, a single light spot, whereby information is read from the surface informationby this scattered light is not focused on the surface of the information recording one of the optical recording medium, if the one optical recording medium is the second optical recording media with a second thickness greater than the first thickness.

2. Optical sensor under item 1, characterized in that the lens is mounted on such a working distance that the light passing through the inner zone, is focused into a single spot with minimal optical distortion on the surface of the information recording of the second optical recording medium during reproduction of the second optical carrier.

3. Optical sensor under item 2, wherein the aspherical surface shape of the inner zone, spaced on said working distance from the optical recording medium, such that the light passing through the inner zone, is focused into a single spot of light on the surface of the information recording of the first optical recording medium during reproduction of the first optical carrier, and the same light is focused into the optical spot with minimal optical distortion on the surface of the information recording of the second optical recording medium during reproduction of the second optical carrier.

4. Optical sensor under item 2, wherein the aspherical fetsa into a single light spot, not having a spherical distortions on the surface of the information recording of the second optical recording medium during reproduction of the second optical carrier with a thick substrate.

5. Optical sensor under item 2, characterized in that the difference Z between the focal length of the annular lens area and a focal length of the inner zone is about the size of defocus determined by the following ratio:

Z = -(2W40)/(NA)2,

where NA is a numerical aperture in the inner zone, and W40is the coefficient of spherical distortion, which has an internal area during playback of the second optical recording media.

6. Optical sensor under item 1, characterized in that the numerical aperture of the inner zone stores the value of at least 0,3 at least.

7. Optical sensor under item 1, characterized in that the annular lens area of the lens has such a numerical aperture that the inner zone and the annular lens area form a single light spot on the surface of the information recording of the second optical recording medium during reproduction of information from the second optical carrier.

8. Optical sensor for p. the displacement of the lens from the lens, face the light source.

9. Optical sensor under item 8, characterized in that the imaginary surface, continuing the aspherical surface of the annular lens area, separated from the vertex of the aspherical surface of the inner zone.

10. Optical sensor under item 8, characterized in that the width of the annular lens area lies between about 100 and about 300 microns.

11. Optical sensor according to p. 10, characterized in that the surface area of the annular lens area is at least 10% of the surface of the lens that receives the light beam from the light source.

12. Optical sensor under item 1, characterized in that it additionally contains at least one additional light source, each light source and at least one additional light source emits light beams with different wavelengths.

13. Optical sensor under item 12, characterized in that it further comprises a beam splitter with the characteristic splitting of the beam with respect to each of the multiple beams respectively emitted from the light source and at least one additional light source.

14. Optical is NNI disk (CMSD), and the second optical recording medium is a compact disc (CD) or a laser disk (LD), when the said light source emits a light beam with wavelength, which is used for digital multilateral disk (CMSD).

15. Optical sensor under item 1, characterized in that it additionally contains at least one additional light source, the first optical recording medium is a digital multifaceted disc (CMSD), and the second optical recording medium is one of a compact disc (CD), recordable compact disc (SCD), a rewritable CD (PKD) and a laser disk (LD), when the first light sources emitting light beams has a wavelength, which is used for digital multilateral disk (CMSD), and the second light source has a wavelength that is applied to a recordable CD (SCD).

16. Optical sensor under item 1, characterized in that the solar cell is the only detector used for detecting the light beam as the optical information from the first and second optical recording media, when used, at least two of the many istocie sensor under item 1, characterized in that the lens has a step that is formed in the region where the annular lens area and the inner area in contact with each other, and this step leads to the fact that the difference of the light paths between the light beam, having passed through the inner area of the above-mentioned lens, and the light beam passed through the annular lens area is an integer multiple of the wavelength of light emitted from the light source, during reproduction of information from the second optical recording media.

18. Optical sensor under item 17, characterized in that the step height is approximately 1.0 to 1.5 μm.

19. Optical sensor under item 1, characterized in that the lens has a step that is formed in the region where the annular lens area and the outer area in contact with each other, and this step leads to the fact that the difference of the light paths between the light beam, having passed through the inner area of the lens, and the light beam passed through the annular lens area is an integer multiple of the wavelength of light emitted from the light source, during reproduction of information from the second optical recording media.

20. Lens compatible, at least when ormatio, contains the internal zone, the annular lens area and the outer area with the center at the top, and the annular lens area has an annular shape and separates an inner area from the outer area, wherein the inner zone, the annular lens area and the outer area are aspheric shape of the surface to focus the light passing through the inner zone and the outer zone, into a single light spot, whereby information is read from the surface of the information recording first of the at least two substrates, which has a first thickness, and to disperse the light passing through the annular lens area formed between the inner area and the outer area, so that the scattered light is not focused on the surface of the information recording first substrate, should be used when the first substrate, and to focus the light passing through the inner zone and the annular lens area in a single light spot, whereby information is read from the surface of the information recording second of the at least two substrates, which has a second thickness greater than the first thickness, and to disperse the light passing through the outer zone to etisalats this second substrate.

21. The lens on p. 20, characterized in that the difference Z between the focal length of the annular lens area and a focal length of the inner zone is the same as the amount of defocus determined by the following ratio:

Z = -(2W40)/(NA)2,

where NA is a numerical aperture in the inner zone, and W40is the coefficient of spherical distortion, should be used when the second substrate.

22. The lens on p. 20, characterized in that it has a step that is formed in the region where the annular lens area and the inner area in contact with each other, and this step leads to the fact that the difference of the light paths between the light passed through the inner area of the lens, and the light passed through the annular lens area has a whole multiple of the wavelength of the light beam radiated from the light source, should be used when the second substrate.

23. The lens on p. 20, characterized in that it has a step that is formed in the region where the annular lens area and the outer area in contact with each other, and this step leads to the fact that the difference of the light paths between the light passed through the inner area of the object, emitted from the light source, should be used when the second substrate.

24. The optical sensor in the optical device that is compatible with discs of different thickness, containing a light source for emitting a light beam, a lens, converted to one of these discs, which are placed in the optical device, the lens has a field of light transmission, divided respectively on the inner, annular lens and outer zones near the axial zone, the intermediate axial zone and the far axis area of the incident light, characterized in that the curvature of the Central and peripheral zones is optimized for one disk if the one disk has the first thickness and the curvature of the annular zone is optimized for a single disk, if the one disk has a second thickness greater than the first thickness, a photodetector for detecting the light beam reflected from this one disk, the separation unit for separating the incident light beam transmitted from the light source, the reflected light beam reflected by one disk.

25. Optical sensor according to p. 24, wherein the inner zone has a value of numerical aperture NA, according to the following uravneniya, and the spot size represents the size of the spot that forms on the same drive as the light beam that has passed through the lens.

26. Optical sensor on p. 25, characterized in that the wavelength is 650 nm, and NA is, at least, 0,37.

27. Optical sensor according to p. 24, characterized in that the annular lens area has an aspherical surface shape, through which the annular lens area corrects the optical distortion of a light beam from the light source passing through the sensor, the focus position of the inner zone.

28. Optical sensor according to p. 27, characterized in that the lens has a coefficient of W20defocus, which minimizes optical distortion, according to the following equation:

W20= -W40,

where W40is the coefficient of spherical distortion resulting from the difference between the first and second thicknesses.

29. Optical sensor on p. 28, characterized in that the Z value of the defocus of the lens follows the equation

Z = -(2W40)/(NA)2= -8,3 microns;

where NA represents a numerical aperture of the inner zone.

30. Optical sensor according to p. 24, characterized in that the width of the ring Lin the SC light.

31. Optical sensor according to p. 24, characterized in that the width of the annular lens area lies between about 100 and about 300 microns.

32. Optical sensor according to p. 24, characterized in that the surface of the annular lens area acting on the surface of the inner and outer zones.

33. Optical sensor according to p. 24, characterized in that the surface of the annular lens area is a recess in the surface of the inner and outer zones.

34. Optical sensor according to p. 24, characterized in that the surface of the annular lens area forms a step with the surface of one of the inner and outer zones.

35. Optical sensor on p. 34, characterized in that the surface of the annular lens area forms a step with the surface of the inner zone, and this step has a value such that the difference of the light paths between the light passed through the inner area, and the light passed through the annular lens area is an integer multiple of the wavelength of light emitted from the light source.

36. Optical sensor on p. 34, characterized in that the surface of the annular lens area forms a step with the surface of the outer zone, and this step is so important that the difference between the light which is integer multiple of wavelengths of light, emitted from the light source.

37.Optical sensor on p. 34, characterized in that it further comprises a collimating lens placed in a linear path between the lens and the photocell, for callmerobbie the incident light beam, separated by a dividing unit, and for transmitting reflected from a single disk of the light beam separation unit, and the lens of the photocell for focusing the reflected light beam passing through the separation unit to the photodetector separation unit is a beam splitter.

38. Optical sensor according to p. 24, characterized in that it further comprises a block, where next to each other posted by the light source and the photodetector, a separating unit, which is a holographic beam splitter, and a collimating lens for callmerobbie light beam passing through the holographic beam splitter beam from the light source, and for transmitting the reflected light beam from one disk to the holographic beam splitter, while the holographic beam splitter directs the reflected light beam to the photodetector.

39. Optical sensor on p. 38, characterized in that it updat maruosa lens.

40. Optical sensor on p. 38, characterized in that the holographic beam splitter is a polarizing hologram.

41. Optical sensor on p. 34, characterized in that it further comprises a block, where next to each other posted by the light source and the photodetector, a separating unit, which is a holographic beam splitter, and a collimating lens for callmerobbie light beam passing through the holographic beam splitter beam from the light source, and to transmit reflected from a single disk of the light beam to the holographic beam splitter, while the holographic beam splitter directs the reflected light beam to the photodetector.

42. Optical adapter device in the optical device for reading information from optical recording media containing a first light source for emitting a first light beam, wherein is provided a second light source for emitting a second light beam, and at this time only the first or the second light source emits respectively the first or second light beams, a lens for receiving the first or second light beam radiated from cooteociago to the optical recording medium, and transmission of a light beam reflected from the optical recording medium, and a photodetector for receiving the light beam reflected from the optical recording medium and passing through the lens to reproduce information.

43. Optical adapter device according to p. 42, wherein the first light source emits the first light beam, if the optical recording medium has a first thickness and the second light source emits the second light beam when the optical recording medium has a second thickness greater than the first thickness.

44. Optical adapter device according to p. 42, characterized in that the first light beam has a first frequency and the second light beam has a second frequency different from the first frequency.

45. Optical adapter device on p. 43, characterized in that the first light beam has a first frequency and the second light beam has a second frequency different from the first frequency.

46. Optical adapter device according to p. 42, wherein the lens is a single lens.

47. Optical adapter device according to p. 42, wherein the lens includes a transmissive light region, is divided into vnutrennego the recording media, if this optical recording medium has a first thickness and the curvature of the annular zone is optimized for optical recording media, if this optical recording medium has a second thickness greater than the first thickness.

48. Optical adapter device according to p. 42, wherein the lens includes a light transmissive region, divided into the inner, annular lens and the outer zone, and the curvature of the Central and peripheral zones is optimized for optical recording media, if this optical recording medium has a first thickness and the curvature of the annular zone is optimized for optical recording media, if this optical recording medium has a second thickness.

49. Optical adapter device on p. 47, characterized in that the surface of the annular lens area forms a step with the surface of one of the inner and outer zones.

50. Optical adapter device on p. 48, characterized in that the surface of the annular lens area forms a step with the surface of one of the inner and outer zones.

51. Optical adapter device according to p. 42, characterized in that it further comprises a first beam splitter for transmitting PE is rather light, a second beam splitter for transmitting the first light beam transmitted through the first beam splitter and the second light beam reflected by the first beam splitter, and a collimating lens for callmerobbie first light beam and the reflected second light beam transmitted through the second beam splitter and transmitting the collimated light beam to the lens, and the second beam splitter reflects the first and second light beams reflected from the optical recording media.

52. Optical adapter device according to p. 49, characterized in that it further comprises a first beam splitter for transmitting the first light beam from the first light source and to reflect the second light beam from the second light source, a second beam splitter for transmitting the first light beam transmitted through the first beam splitter and the second light beam reflected by the first beam splitter, and a collimating lens for callmerobbie first light beam and the reflected second light beam transmitted through the second beam splitter and transmitting the collimated light beam to the lens, the second beam splitter reflects the first and second citichoice fact, he further comprises a first beam splitter for reflecting the first light beam from the first light source, a second beam splitter for transmitting the first light beam reflected by the first beam splitter, and reflecting the second light beam reflected by the first beam splitter, and a collimating lens for callmerobbie first light beam and the reflected second light beam transmitted through the second beam splitter and transmitting the collimated light beam to the lens, and the first and second beam splitters beam transmit the first and second light beams reflected from the optical recording medium to the photodetector.

54. Optical adapter device according to p. 49, characterized in that it further comprises a first beam splitter for reflecting the first light beam from the first light source, a second beam splitter for transmitting the first light beam reflected by the first beam splitter, and reflecting the second light beam reflected by the first beam splitter, and a collimating lens for callmerobbie first light beam and the reflected second light beam transmitted through the second beam splitter, and transfer of collegeroand the Ucka, reflected from the optical recording media.

55. Optical adapter device in the optical device for reading information from optical recording media containing a first light source for emitting a first light beam, wherein is provided a second light source for emitting a second light beam, and at this time only one of the first and second light sources emits respectively the first or second light beam, and a lens for receiving one of the first and second light beams radiated from the respective first or second light source and for focusing one of the first and second light beams emitted to the optical recording medium, and transmission of a light beam reflected from the optical recording medium, and a first photodetector for receiving the first light beam reflected from the optical recording medium and passing through the lens, to reproduce information, and a second photodetector for receiving the second light beam reflected from the optical recording medium and passing through the lens to reproduce information.

56. Optical adapter device according to p. 55, wherein the second light source emits the second light beam, if the optical recording medium has a second thickness greater than the first thickness.

57. Optical adapter unit p. 56, characterized in that the first light beam has a first frequency and the second light beam has a second frequency different from the first frequency.

58. Optical adapter device according to p. 55, wherein the lens includes a light transmissive region, divided into the inner, annular lens and the outer zone, and the curvature of the Central and peripheral zones is optimized for optical recording media, if this optical recording medium has a first thickness and the curvature of the annular zone is optimized for optical recording media, if this optical recording medium has a second thickness greater than the first thickness.

59. Optical adapter device on p. 58, characterized in that the surface of the annular lens area forms a step with the surface of one of the inner and outer zones.

60. Optical adapter device according to p. 49, characterized in that it further comprises a beam splitter for transmitting the first light beam from the first light source and to reflect the second light beam from the second source of storage light beam, reflected by the second beam splitter and transmitting the collimated light beam to the lens, the beam splitter transmits the first light beam reflected from the optical recording medium, to the first photodetector and reflects the second light beam reflected from the optical recording medium, the second photodetector.

61. Lens for use in an optical device that is compatible with different types of optical storage media memory, has many parts with different optical characteristics, and one part of many parts of the lens focuses the light beam on one of the memory regardless of the type of the optical recording medium, characterized in that the many parts of the lens includes a first portion for focusing the light beam radiated from the light source, on the same optical recording medium regardless of the thickness of one of the optical recording medium; the second part for focusing a light beam emitted from the light source, on the same optical recording medium, if the optical recording medium has a first predetermined thickness, and a third portion for focusing the light beam radiated from the light source, natora than the first predetermined thickness, and the surface of the second part forms the difference of the surface of one of the first and third sections.

62. Optical sensor for p. 61, characterized in that the surface of the second portion forms a step surface of the first part, and the step is a value that the difference of the light paths between the light passing through the first portion and the light passing through the second part is an integer multiple of the wavelength of the light beam radiated from the light source.

63. Optical sensor for p. 61, characterized in that the surface of the second portion forms a step with the surface of the third part, and the step is a value that the difference of the light paths between the light passing through the first portion and the light passing through the second part is an integer multiple of the wavelength of the light beam radiated from the light source.

 

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Conoidea lens // 2095832

Collimator sight // 2082188

FIELD: ophthalmology.

SUBSTANCE: goal of the invention is to make lenses with gradually increased focal power. Distribution of focal power between zones of far and near vision should meet requirements related to peculiarities of path of men's glance who uses the lenses and value of refraction. Distribution of focal length is performed without introduction of undesired astigmatism. When making lenses for glasses the two steps are obligatory. The first one is to measure path of glance to a person using lenses and required power of refraction when the person in lenses watches remote object. The second step corresponds to making lens having channel focal power profile on the path of person' s path of glance and meeting the requirements applied to refraction power. Second step is performed by means of making a lens that has first surface, first channel and first channel focal power profile and second surface that has second channel and second channel focal power profile , where lens channel focal power profile has to be vector sum of profiles of channel focal power.

EFFECT: reduced astigmatism.

21 cl, 6 dwg

FIELD: optics.

SUBSTANCE: system has television tube, protective glass, meniscus, three correction-force components with aspheric surfaces, and home video system screen. Meniscus together with protective glass forms a hollow for cooling liquid. Correction-force component is made in form of glass lens. onto at least one surface of lens plastic layer is applied with a spherical contact surface and outer aspheric surface. Plastic layer has optical force. Refraction coefficient of plastic layer is not equal to refraction coefficient of lens glass.

EFFECT: higher quality, lower costs.

1 dwg

Optical member // 2282221

FIELD: optical devices with variable optical parameters, applicable in manufacture of miniature objective lenses with a variable focal length.

SUBSTANCE: the optical member has a container. The container comprises two transparent immiscible liquids with various indices of reflection. They are transparent in the area of operating wave-lengths. The first one is a dielectric. The second one features the properties of electric conduction. The liquids are engageable with each other with formation of an interface separating them. The interface curvature determines the optical parameters of the optical member. For control of the curvature of this interface the container is provided wits electrodes. A porous matrix with liquids with formation of an interface separating them is performed by impregnation.

EFFECT: developed a modification of an optical member with variable optical parameters using the effect of curvature of the interface formed on the boundary of engagement of two immiscible liquids with various indices of reflection, adapted to mass reproduction and featuring a stability to mechanical actions.

3 cl, 1 dwg

FIELD: ophthalmology; multiple focal ophthalmologic lenses.

SUBSTANCE: lens can be used for reduction in undesired astigmatism comparing to known traditional progressive lenses. Progressive lens having gradual growth of optical lens has at least one surface combined of progressive surface and of regressive surface. Combined surface has maximal localized undesired astigmatism which is 0,125 diopter at least smaller than sum of absolute values of maximal localized astigmatism of any progressive and regressive surfaces. Lens can additionally have second progressive surface with gradual growth of focal power. Lens can additionally have second surface which has to be regressive surface. Lens can have normalized distortion of lens being less than 300 square mm.

EFFECT: reduction of undesired astigmatism.

16 cl, 9 dwg

FIELD: gradient optics.

SUBSTANCE: aplanatic gradient lens can be used in fiber optics and optical instrument engineering. Aplanatic gradient lens is confined by first and second refracting surfaces of rotation. Lens has thickness of c along optical axis z, which thickness is multiple to doubled focal length. Lens is made of material with radial distribution of refractivity factor n(y). Lens has shape of refracting surfaces which shape is defined by relation of generator z(y) of z'(y) = y/n(y)√y2+(z(y)+sF)2 - (z(y)+sF), where z'(y) is first derivative of z(y) and sF is front cut. Distribution of refractivity factor of lens' material looks like n(y) = n0sec h a y=2n0/eay+e-ay, where n0 is meaning of refractivity factor at axis and a is constant. Generators of first and second surfaces are defined by the following relations: y21(z)=(n2(y)-1)z2+2sF(n(y)-1)z and y22(z)=(n2(y)-1)(z-c)2+2sF(n(y)-1)(z-c).

EFFECT: improved quality of image; simplified process of manufacture.

4 dwg, 1 appl

Gradient lens // 2289830

FIELD: gradient optics.

SUBSTANCE: gradient lens can be also used in fiber optics and optical instrument engineering. Gradient lens has thickness d along its optical axis z. Lens is limited by first convex refracting surface of rotation with generator y1(z) and by second concave refracting spherical surface with radius R2. Lens has spherical-concentric distribution of refractivity in material of lens, which distribution is defined by formula of n(x, y, z) =n0/f (√x2+y2+ (z-f) 2), where n0 is refractivity at vertex of first refracting surface; f=d+s' which has to be distance from vertex of first surface to center of spherical-concentric distribution of refractivity; s'=R2 which has to be rear cut. Center of spherical-concentric distribution of refractivity coincides with center of second surface at optical; axis. Generator of first refracting surface in plane, which goes through center of spherical-concentric distribution of refractivity, is defined by relation of y21=-z2+2fz+2f/n02((n0s+f)-√2n02(f+s)z+(n0s+f)2), where s if front cut. Lens converts entrance divergent homocentric beam from object being at specific distance from axis, into exit convergent homocentric beam, which is focused in center of distribution of refractivity.

EFFECT: improved exploitation capabilities.

2 dwg, 1 ann

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