JPS6410815B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a photochromic member that has the property of reversibly changing between a darkened state and a non-darkened state depending on the presence or absence of light irradiation. Regarding the anti-glare mirror for vehicles used.

[Prior Art] The reversible change between a darkening state and a non-darkening state in a photochromic member such as photochromic glass is seen as a promising material for anti-glare mirrors because its fatigue and deterioration are extremely low. ing. As an example of this type of anti-glare mirror, a back mirror for automobiles and the like is disclosed in Japanese Utility Model Application Publication No. 178101/1982. The device described in this publication has a mirror body with a reflective film layer arranged on the back side of photochromic glass that forms the surface layer, and this mirror body is held in a housing. In each case, when the headlights of a vehicle behind the vehicle are illuminated on the mirror body, and when sunlight is illuminated on the mirror body during the daytime, the photochromic glass on the surface darkens, creating an anti-glare state. .

However, with such a conventional structure, the anti-glare state is created passively by light rays from the outside, and the anti-glare state cannot be selectively switched using an external signal. Under these circumstances, this type of rearview mirror for automobiles, etc., exhibits an anti-glare state even in the daytime when anti-glare state is unnecessary, and its reflected image may become dark. Therefore, in this case, rearward visibility during the daytime would be poor, and there was a risk that the vehicle would not be practical. In addition, with the conventional configuration described above, since the anti-glare state cannot be selectively switched by an external signal as described above, for example, the anti-glare state can be switched in conjunction with the ON operation of a lighting switch for a car. It is not possible to select a mode of use such as switching, which is extremely inconvenient when actually used for automobiles.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to actively detect the presence or absence of an anti-glare state while using a photochromic member with excellent fatigue resistance and deterioration resistance. It is an object of the present invention to provide an anti-glare mirror for a vehicle that can be selectively selected and has effects such as being extremely convenient in actual use.

[Summary of the Invention] In order to achieve the above object, the present invention includes disposing an ultraviolet absorbing filter and a visible light reflecting member through which ultraviolet rays can pass on the front and rear surfaces of a photochromic member that darkens with ultraviolet rays, respectively. The ultraviolet ray generation source is arranged on the rear surface of the visible light reflecting member in a state where visible light is cut off.

[Example] Hereinafter, a first example of the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, numeral 1 denotes a photochromic glass which is a photochromic member made of silver halide glass containing colloidal silver halide particles, thallium halide glass, etc. A material having sensitivity characteristics, ie, a darkening property that responds sharply to irradiation with ultraviolet light having a wavelength of about 400 nm or less, is selected.
Further, 2 is a film-like or plate-like ultraviolet absorbing filter disposed closely on the front surface of the photochromic glass 1, and 3 is a UV-absorbing filter disposed closely on the rear surface of the photochromic glass 1. This is a half mirror that is a possible visible light reflecting member, and a film-like or plate-like visible light absorption filter 4 is disposed closely on the rear surface of the half mirror 3. Reference numeral 5 denotes, for example, an electroluminescence display panel (hereinafter abbreviated as ELD), which is an ultraviolet ray generation source and is arranged closely behind the visible light absorption filter 4. When an alternating current voltage from the switch 7 is applied through the switch 7, light including the ultraviolet range is generated. Reference numeral 8 denotes a case provided to cover the photochromic glass 1, ultraviolet absorption filter 2, half mirror 3, visible light absorption filter 4, and ELD 5 to cut off visible light. The front surface of the mirror 3 is configured to act as a mirror surface.

Next, the operation of the above configuration will be explained. Since the ultraviolet component of the light incident on the photochromic glass 1 from the front is absorbed by the ultraviolet absorption filter 2, the photochromic glass 1 will not be darkened by the light. However, Switch 7
When the ELD 5 is turned off, that is, when the ELD 5 is not emitting light, no ultraviolet rays are irradiated from the rear surface of the photochromic glass 1, so the photochromic glass 1 maintains a non-darkened state. Therefore, when the switch 7 is turned off, a bright reflected image can be obtained from the half mirror 3, making it suitable for daytime driving. On the other hand, switch 7
is turned on, the visible light component of the light generated from the ELD 5 is absorbed by the visible light absorption filter 4 and does not reach the photochromic glass 1, but the ultraviolet component passes through the half mirror 3. The light reaches the photochromic glass 1 and darkens the photochromic glass 1. As a result of the photochromic glass 1 being darkened in this way, the reflected image on the half mirror 3 becomes darker, providing an anti-glare effect, which can be used when the headlights of a following vehicle are dazzling when driving at night. Suitable.

As described above, according to the configuration of this embodiment, although the photochromic glass 1 is used, the anti-glare state can be selected only when necessary. For example, the anti-glare state can be set in conjunction with turning on the lighting switch. It is possible to realize a usage mode such as switching between the two modes, which can be done conveniently. In addition, according to the above embodiment, all the constituent elements such as the photochromic glass 1 and the ELD 5 can be solidified, so that productivity can be improved and impact resistance etc. can be improved, resulting in reliability. It can also improve sexual performance. In addition, since each of the constituent elements has a wide usable temperature range, the usable temperature range of the anti-glare mirror for automobiles can be widened, which is practically advantageous.

Second to fourth embodiments of the present invention are shown in FIGS. 3 to 5, and only the portions of each of these embodiments that are different from the first embodiment will be described below.

That is, the second embodiment shown in FIG. 3 has a configuration in which an electroluminescence display panel (ELD) 9 that only generates ultraviolet rays is provided as an ultraviolet ray generation source. The visible light absorption filter 4 can be made unnecessary. In addition, the third embodiment shown in FIG.
A fluorescent film 10 that generates ultraviolet rays in response to the light emitted is provided on the front surface of the fluorescent film 5. This structure also makes it possible to eliminate the need for the visible light absorption filter 4. Furthermore, the fourth embodiment shown in FIG. 5 uses an ultraviolet lamp 11 as a source of ultraviolet light.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without departing from the spirit thereof.

[Effects of the Invention] As is clear from the above description, the present invention uses a photochromic member with excellent fatigue resistance and deterioration resistance, but it is also possible to actively detect the presence or absence of an anti-glare state. It is possible to select the desired one, which is extremely convenient in actual use, and has practical beneficial effects such as being able to improve productivity and reliability.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, with FIG. 1 being a schematic longitudinal sectional view and FIG. 2 being a characteristic diagram of a photochromic member. 3 to 5 are views corresponding to FIG. 1 showing second to fourth embodiments of the present invention, respectively. In the figure, 1 is a photochromic glass (photochromic member), 2 is an ultraviolet absorbing filter, 3 is a half mirror (a visible light reflecting member through which ultraviolet rays can pass),
4 is a visible light absorption filter, 5 and 9 are electrophotographic filters.
A luminescence display panel (ultraviolet light source), 7 a switch, and 11 an ultraviolet lamp (ultraviolet light source).

Claims (1)

[Claims] 1. A photochromic member that darkens with ultraviolet rays, an ultraviolet absorbing filter disposed on the front surface of the photochromic member, and a visible light reflecting member through which ultraviolet rays can pass, disposed on the rear surface of the photochromic glass. An anti-glare mirror for a vehicle, comprising an ultraviolet generation source disposed on the rear surface of the visible light reflecting member so as to block visible light.