Exposure control circuit for cameras equipped with self-timer
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United States of America Patent
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Feb 22, 1983
Grant Date -
N/A
app pub date -
Apr 28, 1981
filing date -
Jun 20, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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