| 摘要 |
An automatic sensitivity control circuit for image pickup camera having an amplifier provided in a control roop for controlling an output signal of a vidicon, said amplifier having a photoconductive element varying its resistance value in response to the scene illumination. By the variation of the gain of said amplifier in response to the variation of resistance value of said element, the output signal of said vidicon is controlled to small when the illumination is low and large when the illumination is high.
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