Vehicle rear-view mirror
To provide a vehicle rear-view mirror equipped with a display device, configured so that: a warning indication is easy to see from the driver and is hard to see from following vehicles and vehicles on the adjacent lanes; and when no warning is indicated, no discontinuities occur in the rear-area image reflected in the mirror and the warning symbol is unnoticeable. A mirror element 18 is configured by forming a semi-transmissive reflective film 24 or 56 formed of a dielectric multilayer film on the back or front surface of a transparent glass substrate 22 . A dark color mask member 26 is arranged on the back surface of the mirror element 18 . An opening 26 a is formed on the mask member 26 . A light-orienting tube 28 is arranged in such a manner that it protrudes in the backward direction of the mask member 26 so as to surround the opening 26 a . The tube axis 28 a of the light-orienting tube 28 is inclined in the direction toward the driver's viewpoint. An indication mask 32 , a light diffusion plate 34 and an LED 36 are arranged as an indication light-emitting portion 30 by depositing them in this order on a rear end-side opening 28 b of the light-orienting tube 28.
1. A vehicle rear-view mirror, comprising:
a mirror element having a semi-transmissive reflective film on one surface of a transparent substrate;
a dark color mask member having an opening in a surface thereof, the mask member being arranged over an entire region excluding the opening or at a necessary region excluding the opening, on a back side of the mirror element;
a dark color light-orienting tube arranged so that it protrudes backward from a back side of the mask member, a front end-side opening of the light-orienting tube being communicatively connected to the opening of the mask member on a same axis, the axis of the tube being arranged so that it is inclined relative to the mirror element in a direction toward a driver's viewpoint, the tube being of a dark color on an inner side;
an indication mask, arranged outside or inside the light-orienting tube at a back portion of the tube, in which a warning symbol expressing the content of a particular warning is drawn as a transmissive pattern;
a light source arranged behind the indication mask, wherein:
light emitted from the light source is formed into indication light having the pattern of the warning symbol by making the light pass through the indication mask; and the indication light is guided to the driver's viewpoint by making the light pass through the light-orienting tube and the opening of the mask member and further pass through the mirror element.
2. The vehicle rear-view mirror according to claim 1 , wherein the angle between the axis of the light-orienting tube and a surface of the mirror element is 30° to 80°.
3. The vehicle rear-view mirror according to claim 2 , wherein the area of the front end-side opening of the light-orienting tube in a direction perpendicular to the axis is larger than the area of an rear end-side opening of the light-orienting tube in a direction perpendicular to the axis.
4. The vehicle rear-view mirror according to claim 3 , wherein the inner diameter of the light-orienting tube gradually becomes larger from the rear end side to the front end side.
5. The vehicle rear-view mirror according to claim 3 , wherein the inner diameter of the light-orienting tube bulges at an intermediate portion in the axis direction.
6. The vehicle rear-view mirror according to claim 3 , wherein:
the mirror element has the semi-transmissive reflective film formed of a dielectric multilayer film, the mirror element has a characteristic that exhibits one reflection peak in a visible light range; and
indication light entering the mirror element has a light intensity peak in a band in which the transmittance of the mirror element is higher than the reflectance of the mirror element.
7. The vehicle rear-view mirror according to claim 2 , wherein:
the mirror element has the semi-transmissive reflective film formed of a dielectric multilayer film, the mirror element has a characteristic that exhibits one reflection peak in a visible light range; and
indication light entering the mirror element has a light intensity peak in a band in which the transmittance of the mirror element is higher than the reflectance of the mirror element.
8. The vehicle rear-view mirror according to claim 1 , wherein the area of the front end-side opening of the light-orienting tube in a direction perpendicular to the axis is larger than the area of an rear end-side opening of the light-orienting tube in a direction perpendicular to the axis.
9. The vehicle rear-view mirror according to claim 8 , wherein the inner diameter of the light-orienting tube gradually becomes larger from the rear end side to the front end side.
10. The vehicle rear-view mirror according to claim 8 , wherein the inner diameter of the light-orienting tube bulges at an intermediate portion in the axis direction.
11. The vehicle rear-view mirror according to claim 8 , wherein:
the mirror element has the semi-transmissive reflective film formed of a dielectric multilayer film, the mirror element has a characteristic that exhibits one reflection peak in a visible light range; and
indication light entering the mirror element has a light intensity peak in a band in which the transmittance of the mirror element is higher than the reflectance of the mirror element.
12. The vehicle rear-view mirror according to claim 1 , wherein the light-orienting tube is configured by being molded integrally with the mask member or a mirror holder arranged behind the mask member.
13. The vehicle rear-view mirror according to claim 1 , wherein:
the mirror element has the semi-transmissive reflective film formed of a dielectric multilayer film, the mirror element has a characteristic that exhibits one reflection peak in a visible light range; and
indication light entering the mirror element has a light intensity peak in a band in which the transmittance of the mirror element is higher than the reflectance of the mirror element.
14. The vehicle rear-view mirror according to claim 1 , wherein: the light source is an LED; and a light diffusion plate is arranged between the light source and the indication mask.
15. The vehicle rear-view mirror according to claim 1 , wherein: the light source is a white lamp; and a band-pass filter and a light diffusion plate are arranged between the light source and the indication mask.
16. The vehicle rear-view mirror according to claim 1 , wherein the light source is an electroluminescence element.