Exposure control circuit for a camera

Details Exposure control circuit for a camera Exposure control circuit for a camera

1981-12-07

1984-04-24

Adams, Russell E.

354464, G03B 708

Patent

active

044444818

ABSTRACT:
An exposure control circuit for camera comprises an integrating circuit including a plurality of capacitors for integrating a photocurrent which depends on the brightness of an object being photographed. The integrated voltage is compared against a decision voltage which depends on a particular value of film speed. The level of the decision voltage is switched either manually or automatically for low and high values of film speed as the combined capacitance of the integrating capacitors is switched.

REFERENCES:
patent: 4189221 (1980-02-01), Kawasaki
patent: 4343541 (1982-10-01), Mizokami
patent: 4363541 (1982-12-01), Aihara et al.

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