Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-11-13
1999-12-07
Font, Frank G.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022724, 2502222, 318643, G02B 642
Patent
active
059987820
ABSTRACT:
A windshield (transparent substrate) 1 having the function of detecting the presence of water drops W upon one side surface of the windshield depending upon variations in an amount of reflected light, comprising a rain sensor provided on the other side surface of the windshield, which further comprises: light emitting means 6 for guiding light into the windshield 1; light receiving means 7 for detecting the light which is reflected within the windshield 1; and, light shielding members 10 and 11 provided on the other side surface of the windshield 1 opposing the light emitting means 6 and the light receiving means 7, respectively; wherein the light shielding member 10 shields the light emitted from the light emitting means 6 at an incident angle less than a critical angle at which total internal reflection occurs at a boundary surface between air and the windshield 1, while the other shielding member 11 shields outside ambient light incident upon the light receiving means 7.
REFERENCES:
patent: 5391891 (1995-02-01), Wiegleb et al.
patent: 5414257 (1995-05-01), Stanton
patent: 5498866 (1996-03-01), Bendicks et al.
patent: 5661303 (1997-08-01), Teder
patent: 5703568 (1997-12-01), Hegyi
patent: 5811793 (1998-09-01), Pientka
Imanishi Hideki
Koyama Tadashi
Tanaka Shuhei
Tsunetomo Keiji
Font Frank G.
Lauchman Layla G.
Nippon Sheet Glass Co. Ltd.
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