1991-06-24
1993-01-19
Wintercorn, Richard A.
354437, 354439, G03B 708
Patent
active
051810638
ABSTRACT:
A camera shutter system has a motor driven sector for opening and closing a shutter opening. A photo-interruptor is positioned to intercept a light beam, to effect the generation of a photo-interruptor signal. A timer has a counter that is set to a first count in response to the photo-interruptor signal, and is reset when a given count is reached. A shutter malfunction signal is generated when the level of the photo-interruptor signal has not changed by the time the given count is reached.
REFERENCES:
patent: 3971047 (1976-07-01), Isobe et al.
patent: 4963916 (1990-10-01), Tanaka et al.
patent: 4989030 (1991-01-01), Naka et al.
Akimoto Kazuo
Ito Kanji
Matsushita Katsuhiko
Tagami Shigeru
Noh Jae N.
Seikosha Co. Ltd.
Wintercorn Richard A.
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