1991-06-24
1993-01-19
Wintercorn, Richard A.
354458, G03B 708, G03B 7093
Patent
active
051810646
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 sequential generation of first and second photo-interruptor signal pulses, the first pulse having a width that is a function of the speed of the sector. A timer has a counter that is set to a first count corresponding to an exposure value that is a function of the brightness of an object to be photographed and the width of the first photo-interruptor signal. The timer is controlled to count down in response to the second photo-interruptor signal, and the sector driving motor is energized during the count down of the timer.
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patent: 4325614 (1982-04-01), Grimes
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patent: 4751543 (1988-06-01), Kodaira et al.
patent: 4907027 (1990-03-01), Kobe 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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