Shutter speed control circuit for an image pick-up apparatus
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United States of America Patent
Stats
-
Jan 11, 1994
Grant Date -
N/A
app pub date -
Nov 27, 1991
filing date -
Nov 28, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In an image pickup apparatus having an image pickup device and a shutter speed control circuit for controlling a shutter speed of the image pickup device, the shutter speed control circuit is comprised of a circuit for generating a sensor gate pulse in accordance with a vertical scanning timing so as to output an accumulated charge in the image pickup device, a circuit for generating a saw tooth signal being reset to a predetermined voltage level in accordance with the sensor gate pulse, an inclination of the saw tooth signal in just before reset to the predetermined voltage level being larger than the same in just after reset to the predetermined voltage level, a circuit for comparing a voltage level of an output signal of the image pickup device with the saw tooth signal so as to generate a gate pulse, and a circuit for controlling an accumulating period of the image pickup device in accordance with the gate pulse.
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