A solid state image sensor system includes an array of image pickup cells, a signal read-out circuit for reading out image signals from the cells, and a shift register circuit for enabling the read-out circuit to produce effective video signals in response to shift pulses shifted through the respective shift register stages. The image sensor circuit includes a function security circuit whereby a shift pulse may be positively shifted through the shift register stages at all times for reading out one image pickup cell at one time.
A raster input scanner comprises a linear array of photosensors arranged on a plurality of butted chips. The analog video signal from the first photosensor on each chip is read out for an extended period relative to the readout of the other photosensors on the chip, to provide extra settling time for the signal.
