Patent
1974-09-05
1977-03-29
Hix, L. T.
354 51, G03B 700, G03B 708
Patent
active
040152766
ABSTRACT:
In an electric shutter operating circuit for use in a photographic camera of the class wherein the operation of the shutter is controlled in accordance with the brightness of an object, and information regarding the iris opening and the photosensitivity of the film used, there are provided a photoelectric element for generating an electric signal corresponding to the brightness, means for generating information signals regarding iris opening and the photosensitivity, a comparator circuit for comparing the electric signal and the information signals, means to feedback the output of the comparator circuit to the input thereof, a memory capacitor connected on the output side of the comparator circuit for storing an electric quantity corresponding to the brightness, an amplifier connected to respond to the terminal voltage of the memory capacitor, and means responsive to the output of the amplifier for controlling the operation of the shutter of the camera.
REFERENCES:
patent: 3641890 (1972-02-01), Ono
patent: 3678826 (1972-07-01), Mori et al.
patent: 3690230 (1972-09-01), Mori et al.
patent: 3750540 (1973-08-01), Yanagisawa et al.
patent: 3763751 (1973-10-01), Akiyana
patent: 3855603 (1974-12-01), Ichihashi
patent: 3936842 (1976-02-01), Nanba et al.
Hix L. T,.
LaBarre J. A.
Pfund Charles E.
Yashica Co., Ltd.
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