| 摘要 |
<p>A still picture pickup device provided with a light quantity measuring amplifier (4) which measures a photoelectric current flowing into the overflow drain of a CCD image sensor (3), a diaphragm mechanism (2) for controlling the quantity of light incident in the CCD image sensor, and command devices (8, 9) for giving pickup start command signals. The still image pickup device is fitted so that the light quantity measurement by the photoelectric current is performed when the image sensor is in a non-operation state and thereafter the image sensor starts its pickup operation according to the start command from the command devices (8, 9). Further, the still image pickup device is provided with a diaphragm control circuit (5) which performs the feedback control of the diaphragm mechanism (2) by the light quantity measuring signal from the light quantity measuring amplifier (4) so that the light quantity measuring signal becomes equal to the reference value which is the incident light quantity giving an optimum exposure when the image sensor (3) is exposed during a preset shutter time; a diaphragm fixing mechanism (11) which fixes mechanically a diaphragm opening of the diaphragm mechanism (2) being controlled by the diaphragm control circuit (5), just before a pickup operation starts based on command from the command devices (8, 9); and an output control circuit (6) for taking out from the image sensor (3) the image output signal which is picked up during the preset shutter time after fixing the diaphragm opening.</p> |
