Water-proof optical switching device for controlling flash light

Details Water-proof optical switching device for controlling flash light Water-proof optical switching device for controlling flash light

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

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