Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-08-11
1997-10-14
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
359603, 359604, G02B 508
Patent
active
056775261
ABSTRACT:
A rear light detection device for an automatic antiglare mirror includes a variable light transmissivity layer and a reflecting film provided behind the variable light transmissivity layer. Reflectivity of the reflecting film is variably controlled by controlling the light transmissivity of the variable light transmissivity layer. The reflecting film is made of a half mirror and the device includes a light transmitting member provided behind the half mirror for collecting light which has been transmitted through the half mirror, and a photo-sensor for receiving light collected by the light transmitting member. The light transmitting member may have a concave reflecting surface and light which has been transmitted through the half mirror may be collected on the concave reflecting surface and then received by the photo-sensor. The light transmitting member may include a plurality of light receiving sections disposed at separate locations behind the half mirror and a plurality of light conducting sections for conducting light received by the light receiving sections to the photo-sensor. The light transmitting member may include a scattering surface for scattering the collected light in the vicinity of the photo-sensor.
REFERENCES:
patent: 4542963 (1985-09-01), Linlor
patent: 5253109 (1993-10-01), O'Farrell et al.
patent: 5469296 (1995-11-01), Ohno et al.
Allen Stephone
Murakami Corporation
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