Exposure control circuit of camera

Details Exposure control circuit of camera Exposure control circuit of camera

1980-01-07

1981-10-20

Gellner, Michael L.

354 60R, G03B 7081

Patent

active

042957184

ABSTRACT:
An exposure control circuit for camera comprises a photoelectric transducer element which produces an integrated voltage by the photometry of light from an object being photographed. A trigger signal is applied to the transducer element by a trigger switch which is preferably constructed as a semiconductor switch circuit. The trigger switch is connected, through a potential equalizing switch or resistor, between the non-inverting input terminal and the output terminal of an operational amplifier which is arranged to operate as a voltage follower to derive an output voltage equal to the integrated voltage.

REFERENCES:
patent: 4099115 (1978-07-01), Watanabe
patent: 4107707 (1978-08-01), Wumata et al.

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