In a solid state image sensor device comprising a cell area wherein unit cells
each having photoelectric diodes are arranged in a matrix form on a semiconductor
substrate, the cell area being composed of a photo-sensitive pixel region for sensing
an image, and an optical black pixel region for defining an optical black level,
and a vertical shift register for selecting the unit cells of the image sensing
cell array, in a group along each of horizontal lines, and vertical signal lines,
each of which reads each of signals from the unit cells selected by turning on
an address register by means of the vertical shift register, the vertical signal
lines in the optical black pixel region are connected with each other through a
wiring. Since the vertical signal lines in the optical black pixel region are connected
with each other by a wiring, even if outputs from an optical black pixel region
vary in the pixels, the outputs are made averaged and uniform and a variation in
fixed pattern noises between the horizontal lines are reduced.
