ELECTROPHOTOGRAPHIC CAMERA DEVICE

摘要

PURPOSE:To compress the frequency band of a picture signal and to reduce the size and price of the titled device by changing the speed for reading out the signal from an image pickup device before and after the opening of a shutter. CONSTITUTION:Image pickup light passed through a lens 6 is gated in a moment by the opertion of an optical shutter 7, converted into an electric signal by an image pickup device 8 and accumulated on the photoelectric conversion surface of the device 8. The device 8 scans the electric signal accumulated on a two- dimensioal plane by an output pulse from a driving pulse generating circuit 11 to convert the signal into a time-sharing signal. A signal processing circuit 9 amplifies the output signal of the image pickup device 8 and converts the amplified signal into an electric signal easy to be recorded in a recording device 10. After opening the shutter 7 by the depression of a pushbutton 13, the frequency of a driving pulse reading out the image pickup device 8 is reduce and the device 8 is scanned at a low speed in comparison with the time of dark current reading out before the opening of the shutter 7.