Multilayer rear view mirror for vehicles

 

Multilayer mirror comprises a glass substrate, was highly reflective aluminium layer and the applied multilayer dielectric coating of alternating layers of aluminum oxide and titanium oxide of the six layers. It was highly reflective layer of aluminum adjacent the aluminium oxide layer geometrical thickness 113-115 nm, the geometric thickness of the other layers of aluminum oxide and titanium oxide have a size 76-78 and 49-51 nm, respectively. Was highly reflective layer of aluminum deposited on the outer side of the substrate, and its geometrical thickness has a value of 200-500 nm. Protected view of the driver from the glare at night by improving the suppression of reflections in a narrow spectral region, where the zone of maximum sensitivity of the human eye in the dark while increasing the level of overall reflectance in the visible region of the spectrum. 2 Il.

The invention relates to the design of multilayer mirrors used as automotive rear view mirrors, ensuring the safe operation of the vehicle, and can be used on all types of transport.

Blindness is a common cause of accidents and road is.

Optical or spectral protection from glare based on the specific physiological mechanism of human vision and is based on the change of the reflectance spectrum of multilayer mirrors by coating on the mirror surface of the interference coating. The principle of operation of these mirrors is based on the peculiarities of the sensitivity of the human eye day and night.

The retina consists of light-sensitive objects: rods and cones. Vision in conditions of insufficient visibility is carried out almost exclusively with chopsticks, and in bright light conditions - with the help of cones [Feynman R., Leighton R., Sands M. the Feynman lectures on physics - M., Mir, 1976, 496 S. ] . In Fig.1 the solid curve 1 characterizes the sensitivity of the eyes in the dark, i.e., the sensitivity at the expense of sticks, and the dotted curve 2 refers to the vision in the daytime. The maximum sensitivity of the sticks is in the green wavelength=500 nm, and cones - at wavelength=550 nm. The spectral sensitivity of the night vision shifted relative to day in the shortwave region of the spectrum. Both types of view are Nezavisimaia, you can achieve that in the presence of blinding of the same type of view of another type of view will continue to work effectively, distinguish the things.

Known mirror having a multilayer coating consisting of a glass substrate, the multilayer coating of dielectric material and the metal was highly reflective layer [Japan patent JP 212704/1985]. There are two ways multilayer coatings: three - and four-layer. Formula three-layer coating has the form:1As H2B2where B1- material with high refractive index having an optical thickness0/4, N - a material with a low refractive index having an optical thickness0/4, 2B - a material with a high refractive index having an optical thickness0/2. Formula four-layer coating is in the form of In1H1In2H2. All layers have an optical thickness0/4, where0- the wavelength of light selected as a control in the formation of the coating corresponds to the spectral region of maximum sensitivity of the night vision. The above multi-layer C is in the range of 550-700 nm. This mirror has a light blue color. For reasons that impede the achievement of specified following technical result when using the known multilayer mirrors, is that in the known multilayer mirror the maximum of his reflection is in the region of maximum sensitivity of the human eye at night (500 nm), and therefore, this mirror does not prevent the glare reflected light. The second important disadvantage of this multilayer mirrors is a material breach of the color balance of the reflected light, which can lead to difficulties in the recognition by the driver of the reflected color.

Known mirror having a multilayer coating [patent RU 2125283, G 02 In 5/08, 60 R 1/08, 1998], consisting of a transparent substrate, the multilayer coating (two or three layers) and was highly reflective metal layer deposited on the multilayer coating. This mirror is characterized by the suppression of reflections in the region of the spectrum 500-560 nm. Thanks to the application of multilayer coating of semiconductor material with a high refractive index, the technical result is achieved in a smaller number of layers. For reasons that impede the achievement of the decree it is the minimum reflection is shifted relative to the maximum sensitivity of the human eye in the dark the integrated reflection coefficient in the visible range is relatively low and does not exceed 60%, the suppression of reflections in the region of the spectrum 480-550 nm is not effective.

The closest to the proposed technical solution to the technical essence is a mirror having a multilayer coating [US patent US 4955705, G 02 In 5/08, 1990]. It consists of a transparent substrate, a multilayer dielectric coating (two to four layers) formed on one side of the substrate and the metal or semiconductor layer which is formed on a multilayer dielectric coating. Multilayer coating includes at least one layer having an optical thickness0/2, and all other layers have an optical thickness0/4. As a material having a high refractive index, it is preferable to use oxides, such as Tio2TA2About5, Zr2SEO2, fO2and LaO3and sulfide ZnS. As a material having a low refractive index, - MgF2, SiO2, F3and Al2O3. The formula of such a multilayer coating in one of the examples is: ML2HL, where N vysokopil the Oh nizkoroslogo dielectric material with a refractive index of 1.3 to 1.6, optical thickness0/4; 2N with high refraction layer, the optical thickness0/2; P is a glass substrate; M is a metal layer or semiconductor.

In Fig. 1 shows the spectral dependence of the reflection coefficient of the prototype multilayer mirrors (4).

For reasons that impede the achievement of specified following technical result when using the known multilayer mirrors, taken as a prototype, is the fact that it is not effective to suppress the reflection (R= 30%) in the region of maximum sensitivity night vision person and has a low integral reflection (~45%) in the visible region of the spectrum.

The objective of the invention is the provision of protection of vision of the driver from glare at night by improving the suppression of reflections in the narrow region of the spectrum, where the zone of maximum sensitivity of the human eye in the dark (region 480<<530 nm), while increasing the level of overall reflectance in the visible region of the spectrum.

The problem is solved by the development and use of multilayer mirrors for vehicles, including the participation of alternating layers of aluminum oxide and titanium oxide. The multi-layer dielectric coating of the six layers are deposited so that it was highly reflective layer of aluminum deposited on the outer side of the substrate, adjacent the aluminium oxide layer geometrical thickness 113-115 nm, the geometric thickness of the other layers of aluminum oxide and titanium oxide have a size 76-78 and 49-51 nm, respectively, was highly reflective layer of aluminum deposited on the outer side of the substrate, and its geometrical thickness has a value of 200-500 nm.

The specified arrangement of layers and their thickness are crucial for the formation of the spectral characteristics of reflectance, providing effective glare effect mirrors and integral high reflectivity in the visible spectrum. The proposed multilayer mirror greatly reduces (up 8%) reflected light with a wavelength in the region 480<<530nm, protecting eyesight from the glare. Integral reflection multilayer mirrors in the visible spectrum of 400-700 nm is greater than 80%.

In Fig. 1 shows a function of vidnosti human vision day and night, spectral curves reflect the proposed multilayer interference coating solution (curves 1, 2, 3, and 4, respectively).

referencing floor.

Multilayer mirror (Fig.2) consists of a glass substrate 5, a reflective coating of aluminum 6 and six-plane interference coatings consisting of alternating layers of aluminum oxide 7 with a low refractive index of nN=1,63 and titanium oxide 8 with a high refractive index of nIn= 2,5, and the geometric thickness of the layer of aluminum oxide and titanium oxide are d=76-78 nm and d=49-51 nm, respectively, with the exception of the aluminum oxide layer adjacent to the metal surface, the geometric thickness of which is d=113-115 nm.

Multilayer dielectric coating consists of six layers of alternating low and high refractive indices. Adjacent to the metal layer of aluminum oxide having a low refractive index, adjusts the phase of the reflected wave. The multilayer mirror is a design (VN)2B1, 48 1/P, where a layer of TiO2with high refractive index of nB= 2,5; N - layer of Al2About3with a low refractive index of nH=1,63; Al - was highly reflective metal layer; a P - substrate. The optical thickness nd each of the coating layers, with the exception of the film adjacent to the metal equal tod = (1+)0/(4), where d is the geometrical thickness of the layer;- jump phase of the electric vector in the reflection from the boundaries of the insulator - metal, where nNthe refractive index of a non-absorbent coating, n and k are the real and imaginary parts of the complex refractive index of the metal (n-ik), i is the imaginary unit. For aluminum mirrors the complex refractive index is equal to (0,6-i 5,01), and the geometric thickness of the layer of aluminum oxide is d=76-78 nm, and the geometrical thickness of the layer of titanium oxide is d=49-51 nm, and the aluminium oxide layer adjacent to the metal surface has a geometric thickness d=113-115 nm.

The refractive index and the geometrical thickness of the layers are selected in such a way that the damping of reflected light occurred in a narrow spectral region 480<<530 nm corresponding to the zone of maximum sensitivity of human vision in the dark, while maintaining a high reflection in the visible spectral range 400-700 nm.

The Centuries, Turaeva, P. Magnetron sputtering system (magnatron) //M CRI "electronics", 1979, 57 S.] as follows: substrate pre-degreased and placed in a vacuum chamber, which is pumped to a pressure ofOST=6,610-3PA. Then is the overlap of argon to a pressure P=0.26 PA. The substrate close the valve and ignite the discharge in a magnetron with an aluminum target. Removes the oxide film from the surface of the target within 5 minutes of burning discharge. The valve is removed, and the coated reflective coatings of Al. The time of spraying is to=5 minutes When applying the interference coating the substrate is heated to T=200-250oTo enhance performance, increase the density of the coating, reducing their porosity and mechanical strength. The coating layer interference coating carried out in the atmosphere of a gas mixture of AG and O2when the pressure P=0.26 PA. The spray material is aluminum and titanium targets magnetron produce alternately. In the transport area and on the surface of the substrate, oxidation of the atoms of the material of the target and the substrate to form a coating of the light source with a stabilized power source, modulator (f=400 Hz), narrowband filter=500 nm, a silicon photodetector, the resonance amplifier and recording device (S-1413). The optical thickness of the layers is controlled by the control sample, located in the plane of the work products to change the reflection. At the points of extremum of the application of each layer cease.

The peculiarity of the proposed technical solution multilayer mirrors is that the geometric thickness adjacent to the surface of the aluminum layer of aluminum oxide d=113-115 nm, and the geometrical thickness of subsequent layers have a value for Al2About3d=76.7 nm, for Tio2d=49-51 nm. Due to the fact that the multilayer coating is on the surface was highly reflective metal layer located in turn on a glass substrate, the reflected light does not experience the refraction in the glass, which can further increase the integral reflection and reduce distortion.

Developed and by the method of magnetron sputtering is made a mirror having a multilayer interference coating. The spectral characteristic of the reflection coefficient of the mirror with such a coating is shown in Fig. 1. It is evident from Fig.Stateliest night vision of the human eye (max= 500 nm) and the reflection coefficient in this region is estimated at ~8%. It is evident from Fig.1 shows that the multilayer mirror has a high reflectance in the blue (430-480 nm) and red (540-700 nm) wavelengths. The selectivity of the reflection of the mirror is not actually reduces the integral value of the reflection coefficient. According to the international requirements of the UNECE Regulations 46 mirrors in the "night" should ensure that the color recognition signal traffic signs (reflectance not lower than 4%); despite adverse weather conditions, the reflective surface of the exterior mirrors have a long time to maintain the specified properties.

Light reflected from the mirror with the proposed interference coating, does not blind the human eye reflected light in the dark. More effectively preventing blinding effect, the coating does not impair the consumer properties of mirrors in the range of the visible spectrum. In terms of mechanical performance, this mirror can operate in harsh operating conditions. Multilayer mirror meets the international requirements of the UNECE Regulations 46.

The formula and the ku, was highly reflective aluminium layer and the applied multilayer dielectric coating of alternating layers of aluminum oxide and titanium oxide, wherein the multilayer dielectric coating of the six layers are deposited so that it was highly reflective layer of aluminum adjacent the aluminium oxide layer geometrical thickness 113-115 nm, the geometric thickness of the other layers of aluminum oxide and titanium oxide have a size 76-78 and 49-51 nm, respectively, and was highly reflective layer of aluminum deposited on the outer side of the substrate, and its geometrical thickness has a value of 200-500 nm.

 

Same patents:

The invention relates to the field of optical instrument, in particular to interference coatings and can be used to create a mirror, beam-splitting filter and other multilayer coatings for optical elements, a wide variety of applications, including laser technology in the field of wavelengths from 0.4 to 9.0 μm

Interference mirror // 2097802

Ar coating // 2097801
The invention relates to an optical instrument, in particular for the optical coatings and can be used to create a walk-through optical element (OE) of the semiconductor materials (PMM) with antireflection coatings for infrared (IR) radiation, which can be used in the process of laser systems

The invention relates to an optical instrument, in particular an interference coatings, and can be used to create the output mirror of the resonator powerful technological CO2lasers

Interference mirror // 2091826

Bandpass filter // 2079861

The invention relates to optoelectronics and integrated optics and can be used to create a structurally stable narrow-band interference filters, logical optical elements and picosecond optical keys UV, visible and IR frequency range

The invention relates to the field of astronomical instrumentation and can be used in serial small telescopes for fastening the main mirror having a Central hole
The invention relates to reflectors, made of plastic workpiece, the surface of which serve to reflect the rays deposited metal layer
Mirror // 2159217
The invention relates to the field of optical instruments, creating a light image of the subject in any geometric configuration

Mirror // 2107315

The invention relates to the field of opto-electronic instrumentation, in particular for space telescopesthrough, and can be used in the development and manufacturing of large space-based optics

The invention relates to quantum electrical engineering, in particular to a device for measuring the absorption coefficient used in devices for forming and transporting radiation cooled mirror at the working wavelength

The invention relates to an optical instrument, in particular to optical systems for observation and measurement of distance to remote objects using laser pulses, and can be used in optical devices for monitoring and tracking remote objects
Up!