1989-06-28
1990-09-25
Hix, L. T.
354441, 354236, 354233, G03B 700, G03B 900
Patent
active
049596802
ABSTRACT:
A camera system of the type having a lens shutter, a focal-plane shutter, an aperture defined by the lens shutter, and a camera lens, includes a selector circuit which sets an operation mode to either a lens shutter mode in which the lens shutter is operated as a programmed shutter or a focal-plane shutter mode in which the shutter speed is controlled by the focal-plane shutter and the aperture of the camera system is controlled by the lens shutter; a first driving system which controls the lens shutter; a second driving system which controls the time during which the focal-plane shutter is operated; a sequential control circuit which controls the timing of the first and second driving systems; a setting circuit which sets the focal length of the camera lens; an arithmetic circuit which produces an output signal in response to the brightness of the subject, the distance to the subject, the focal length of the lens and the sensitivity of the film; and a switching circuit which switches the operation mode to the focal-plane shutter mode irrespective of the setting of the selector circuit when the exposure value to be controlled exceeds the programmed exposure value of the lens shutter and for switching either the operation mode or the shutter speed in accordance with the set focal length to prevent photographic blurring during camera shake, in response to the output from the arithmetic circuit.
REFERENCES:
patent: 4166685 (1979-09-01), Hashimoto
patent: 4200385 (1980-04-01), Shono
Ishida Hiroaki
Ishii Isamu
Iwamatsu Yoshiyuki
Nakano Yoichi
Nemoto Ichiro
Hix L. T,.
Seikosha Co. Ltd.
Spyrou Cassandra C.
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