Exposure control circuit for cameras equipped with self-timer

Details Exposure control circuit for cameras equipped with self-timer Exposure control circuit for cameras equipped with self-timer

1981-04-28

1983-02-22

Perkey, William B.

354267, G03B 1740

Patent

active

043746152

ABSTRACT:
An exposure control circuit for cameras equipped with a self-timer comprises an RC integrating circuit including a capacitor and a resistance for determining an automatic shutter releasing period and a time constant setting circuit employing the same capacitor for switching from the self-timer operating mode to the exposure time control mode. Exposure time is determined by the capacitor and the output signal of a photoelectric conversion circuit. This circuit construction allows a single electromagnet to control both an automatic shutter releasing period and exposure, and a single capacitor to function in three time constant setting operations.

REFERENCES:
patent: 3718077 (1973-02-01), Ono
patent: 3745902 (1973-07-01), Taguchi
patent: 3975746 (1976-08-01), Beppu

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