Rear view mirror for vehicles

 

(57) Abstract:

Usage: lighting, in particular in the mirrors for vehicles, and relates to devices rear view (review), mainly cars. The inventive glare layer mirror is made of graphite or aluminum nitride with a thickness of 0.01 to 1.0 μm. 2 Il., table 1.

The invention relates to lighting, in particular mirrors for vehicles, and for the device rear view (review), mainly cars.

It is known device is a rear view of the car containing the mirror is able to reduce the blinding of the driver's headlights behind going transport at night by controlling the reflectivity of the mirror element (French patent N 2119463, class B 60 R 1/00, 1972). The device has a mechanical managed devices, using which set the rear view mirror at night or day position, respectively, by changing the degree of reflection of the incident light.

Known glare mirror, in which the change in reflectivity is achieved by installing the front surface of the mirror element of the optical medium with variable prose is, teramae case, the plate with two different reflectivity layers, of which at least one is made glare (prototype). The mirror surface is made of phototrope glass and two reflecting layers of titanium oxide and silver. Phototrophy effect is achieved by the fact that in ordinary borosilicate glass add fine particles of silver halide, and is annealed at a temperature of 565aboutWith over 180 minutes Glare layer of titanium oxide or chromium is applied by sputtering in a vacuum from a vapor phase or a dipping method. This mirror allows you to reduce the glare on 30-35%

A disadvantage of the known mirror is that phototrophy glass have long regeneration time and the reduction of glare is achieved by only 15% in Addition, when the dimming at night the reflection from phototrope glass with a reflective layer of titanium oxide and silver does not give good color and distinctiveness of contrapositively to the eyes of the driver, thereby reducing the traffic safety. The technology of manufacturing such a mirror element is a complex and multistage due to additional annealing glass, and requires the use of expensive deficient mothers who placed the driver reflected headlights behind going transport while maintaining sufficient distinctiveness colors and shapes (contours reproducibility).

This objective is achieved in that in the rear view mirror for vehicles, comprising a housing, a plate with two different reflectivity layers, of which at least one glare layer is made of graphite or aluminum nitride with a thickness of 0.01 to 1.0 μm.

The invention consists in the following. When placing a plate of glass with a thickness of 3-5 mm in the magnetron on it when the sputtering of a graphite target in pure argon at a pressure of 210-2mm RT.article deposited thin carbon film having a mirror surface. Good film-forming properties of graphite allow you to get at various capacities spray coatings with tunable optical properties and thicknesses. Used graphite target is a disk with a diameter of 136 mm and a thickness of 2 mm

The substrate for film deposition are placed in the magnetron on a rotating table, located so that the substrate used for deposition, was always at the center of the target. Since graphite has a great absorbtiometry, to prevent contamination of the growing film gases, the target before the deposition of the films previously receive sufficient outgassing. / Min net is Ron about 400 C.

The effect of power dissipation on the optical and physical properties of the obtained coatings was manifested in obtaining films consisting of different types of links carbon atoms (tetrahedral and trigonal). The change in the power dissipation was possible to obtain films with different density, hardness and the absorptive capacity of the mirror surface.

Received the mirror due to the different optical properties of the film coating (graphite or aluminum nitride) is able to provide antireflection effect at different times of day, and consequently, to improve traffic safety on the roads. Due to the good adhesion of the coatings to the substrate eliminates the need for additional processing in the protective coatings of the mirror reflecting layer that simplifies the technology of their preparation.

A variant of the proposed device can be a two-way mirror with different reflectivity. Execution glare layer of graphite or aluminum nitride also provides atmosferoustojchivosti and korrozionnostojkie mirrors due to the inertness of the carbon layer without additional process steps for applying the protective coating of setiu, therefore, to reduce traffic safety. Increasing the coating thickness above 1 μm creates a large shadow and the mirror surface does not provide the required contrapositively and thereby affects the visibility of the items that reduces traffic safety.

In Fig. 1 shows the rear view mirror of Fig. 2 section a-a in Fig. 1.

The mirror includes a housing 1, plate 2, layers 3 and 4.

P R I m e R 1. Thermally polished glass thickness of 3 mm was pre-purified from impurities in the alcohol solution, was dried and placed in a magnetron with a planar arrangement for spraying. The spray chamber was pumped to a pressure of 10-5mm RT.article Then, during rotation of the table was filled with argon under a pressure of 210-2mm RT.article and applied voltage of 200 C. With the appearance of abnormal glow discharge produced sputtering target made of a graphite anode (THE 16-538.020-75) within 5 minutes After stopping the rotation of the table stopped the flow of argon, cooled camera and filled the air.

The reflection coefficient obtained mirrors was measured using a photometer FM-59 in natural light conditions. Measurements were made at three points of the mirror surface is GCC extent reduce glare (%) produced by the difference of the values of the reflection coefficients of the mirrors with available surface and obtained by the described method mirrors, with glare effect. Contrapositively subjects were assessed visually in comparison with a reference mirror and a real (not reflected) by the subjects.

P R I m m e R 2. A plate of polished glass thickness of 4 mm after purification from impurities in the alcohol solution and drying were placed in a spray chamber of a magnetron with an aluminum target (aluminum grade a-1), in which, after evacuation to a pressure of 10-5mm RT.article gave a mixture of argon (85%) and nitrogen (15% ). The voltage at the magnetron for ignition discharge was 400 C. the deposition Rate of 5 μm/h

P R I m e R 3. Technology example 1, but as a graphite target used colloidal graphite (TU 16.538.317-77).

P R I m e R 4. Technology example 1, but as a graphite target used spectral pure graphite (TU 16-538.240-74).

P R I m e R 5. Technology example 1, but as a graphite target used termorasshirennyi graphite (grade TWG).

P R I m e R 6. Technology example 1, but as a graphite target used graphite anode; height glare layer is 0.01 μm.

P R I m e R 7. Technology example 1, but as a graphite target used the measure reflectivity and contrapositively.

The results of the tests of mirrors made according to examples 1-7, presented in the table.

As can be seen from the table, mirror glare layer manufactured according to examples 1-7, compared with the prototype have a smaller reflection coefficient ( 1.5 times), in which the blinding of the driver of the headlights is reduced by 50-60%

REAR VIEW MIRROR FOR vehicles, comprising a housing and fixed therein a plate with two different reflectivity layers, of which at least one layer is made glare, characterized in that, to improve traffic safety by reducing the blinding of the driver of the reflected light, glare layer is made of graphite or aluminum nitride with a thickness of 0.01 to 1.0 μm.

 

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