Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-03-14
1994-12-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
200 6102, G01D 534
Patent
active
053713591
ABSTRACT:
An optical switching device comprises a light emitting device, a reflector for reflecting a light emitted by the light emitting device and having a plurality of set states, a reflected light distribution being changed by switching the set state, a pair of photo-sensing devices for sensing a light from the reflector, and a detector for detecting a difference between light amounts sensed by the photo-sensing devices. The set state of the reflector is discriminated based .on the detection output of the detector.
REFERENCES:
patent: 4340813 (1982-07-01), Sauer
patent: 4902903 (1990-02-01), Segerson et al.
patent: 5061848 (1991-10-01), Choi
Hagiuda Nobuyoshi
Matsui Hideki
Sakamoto Hiroshi
Yokonuma Norikazo
Nelms David C.
Nikon Corporation
Shami K.
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