JP2891566B2 - Anti-glare mirror - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-glare mirror such as a vehicle interior mirror.

[0002]

2. Description of the Related Art A reflecting mirror used as a vehicle interior mirror is a glass substrate on which aluminum is vapor-deposited, and the reflectance of the reflecting mirror is as high as 80 to 90%, the reflected image is too bright, and the spectral characteristics are high. Is flat. For this reason, when the vehicle is turned away from the sun or when illuminated by lights of a following vehicle at night, glare causes fatigue. In addition, prism-type anti-glare mirrors that are now widely used
The anti-glare reflectance of the vehicle was 4%, so that the headlights of the following vehicle could be easily discriminated.

[0003]

In order to prevent this, a light interference film is used to increase the reflectivity of an anti-glare mirror used at night to 4 to 10% to make it easier to see. The brightness of the headlights is so high that glare cannot be eliminated. There is a colored mirror formed by applying a black coating on three to five interference films, but the manufacturing cost is high. Further, if another color tone is used, the luminous reflectance is extremely reduced, and the reflectance standard at the time of regular use cannot be maintained. SUMMARY OF THE INVENTION An object of the present invention is to provide an anti-glare mirror capable of reducing glare even when the reflectance increases, characterized in that a wavelength range of 400 to 450 nm of reflected light when anti-glare is used is cut.

[0004]

Means for Solving the Problems The present invention for achieving the above object, reverses the reflex conventional prism, highly reflective surface, but have a function of low reflection in the rear surface.
In other words, incident light rays are not reflected on the surface of the prism type mirror substrate.
And the reflected light flux on the back surface and the outgoing direction are different.
A reflection surface switchable mirror for low reflection
The front surface of the mirror substrate has a wavelength-selective interference film having a reflectance of 50 to 70%, the rear surface has a reflection film on which a reflected image of 4 to 10% appears, and the interference film on the front surface has a peak value of 400 to 70%.
A multilayer dielectric film of three or more layers is formed to have a thickness of 450 nm.
The interference film on the surface is made of TiO ₂ (λ / 4) / SiO ₂ (λ /
4) / TiO ₂ (λ / 4), and the back surface is a metal such as chromium or a dielectric film such as TiO ₂ (λ / 4).

[0005]

The reflection of the anti-glare use reflected light on the back surface is selectively reduced by the interference film on the front surface with respect to the wavelength of the dazzling region,
400-450 which gives stimulation as dazzle to human eyes
Even if the reflectance increases when the anti-glare mirror is used by reducing the wavelength range of nm, glare is reduced. Since the reflected light during daytime uses the surface reflected light of the prism, the trouble of the double image is reduced as compared with the conventional method.

[0006]

Embodiment 1 FIG. 1 shows a cross section of an anti-glare mirror according to the present invention, in which TiO ₂ (λ /
4) An interference film 2 of a multilayer dielectric film of / SiO ₂ (λ / 4) / TiO ₂ (λ / 4) is formed, and TiO is formed on the back surface.
_{2 After} forming the dielectric film 3 by (λ / 4), a black protective coating film 4 is applied. The dielectric film 3 and the protective coating 4 can be replaced with a metal reflection film such as chrome.

As described above, the surface has a reflectance of 50 to 70%.
As shown in FIG. 2, a wavelength-selective interference film 2 having a peak value of 400 to 450 nm is provided, and the back surface has a metal or dielectric film 3 for reflecting the interference transmitted light on the back surface. Although interference film 2 of the surface is highly reflective of the wavelength of the selectively bright region, which is recognized as the brightness for the driver for use during the daytime. On the other hand, the headlights of following vehicles at night, etc.
When the light from the lamp feels dazzling to human eyes ,
By switching the reflection surface of the mirror, a wavelength range of 400 to 450 nm that gives stimulation as glare is set on the mirror substrate.
Cut surface, the light reaching the back surface is a metal or induction
Function of anti-glare reflection is exhibited is more reflected to the back reflecting layer is a collector layer 3. In other words , it has the function of inverting the reflection function of the conventional prism type mirror so as to provide high reflection on the front surface and low reflection on the back surface.

[0008]

According to the present invention, since the reflected light during daytime use is the light reflected on the surface of the prism, the trouble of the double image is reduced as compared with the conventional method. The surface reflected light is 400 to 450
The brightness is enhanced by increasing the wavelength range of nm. On the other hand, since the wavelength of 400 to 450 nm is cut off on the back side reflected light, even if the reflectance at the time of anti-glare is increased, there is little stimulation as glare for the driver, and the rear visibility when using the anti-glare mirror. Useful.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an anti-glare mirror.

FIG. 2 is a diagram showing spectral reflectance characteristics.

[Explanation of symbols]

 Reference Signs List 1 glass substrate 2 interference film 3 backside dielectric film 4 protective coating

Claims (3)

(57) [Claims] 1. An incident light beam on a surface of a prism type mirror substrate.
And the back side reflects the reflected light flux and outgoing direction on the front side.
A mirror whose surface can be switched to a different reflection surface for low reflection, wherein the surface of the mirror substrate has a wavelength selection interference film having a reflectance of 50 to 70%, and the back surface has a reflection film on which a reflection image of 4 to 10% appears. And the interference film on the surface has a peak value of 400 to
An anti-glare mirror comprising a multilayer dielectric film having three or more layers so as to have a thickness of 450 nm. 2. The interference film on the surface is made of TiO ₂ (λ / 4) /
The anti-glare mirror according to claim 1, wherein the ratio is SiO ₂ (λ / 4) / TiO ₂ (λ / 4). 3. The dielectric film on the back surface is made of TiO ₂ (λ / 4).
The anti-glare mirror according to claim 1, wherein