Title: Exposure control apparatus for a camera

Abstract: The present invention relates to an exposure control apparatus for a camera which is so designed that the output terminal of the light measuring circuit of the brightness of the object to be photographed having a photo electric transducing means is connected to one input terminal of an operation amplifier. The output of the photographing information setting circuit, having a variable resistance means for setting other photographing informations than the information of the brightness of the object to be photographed, is connected to the other input terminal of the above mentioned operation amplifier. This is done in such a manner that proper exposure conditions can be obtained by means of the output of the exposure control circuit connected to the output of the above mentioned operation amplifier. Each input signal to the operational amplifier is adjusted by a bias signal which is controlled in accordance with ambient temperature conditions.

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Inventors: Hashimoto, Teiji (Kawasaki, JA)
Matsumoto, Seiichi (Yokohama, JA)
Taguchi, Tetsuya (Kawasaki, JA)
Kiyohara, Takehiko (Zama, JA)
Tsunekawa, Tokuichi (Yokohama, JA)

Application Number: 534578
Filing Date: 1974-12-19
Publication_date: 1976-08-03
Assignee: Canon Kabushiki Kaisha (Tokyo, JA)
Primary Class(es): 396/228 396/231, 396/293
Other Classes:
US Patent Ref:

3678826	Jul, 1972	Mori et al.	354/51.
3690230	Sep, 1972	Mori et al.	354/51.
3750540	Aug, 1973	Yanagisawa et al.	354/51.
3863263	Jan, 1975	Itagaki	354/50.

Other Refs:
Primary Examiner: Hix, L. T.
Assistant Examiner: LaBarre, James
Attorney: Toren, McGeady and Stanger