a solid state image sensor having row lines connected to a vertical scanning circuit , column lines connected to a horizontal scanning circuit , a video line selectively connected to the column lines , and pixels arranged at cross points between the row and column lines , each pixel including a static induction transistor having a drain connected to the ground , a source connected to a column line and a gate connected to a capacitor formed by a gate electrode connected to the gate , a photoconductive film applied on the gate electrode and a transparent electrode applied on the photoconductive layer . the transparent electrode may be divided into a plurality of parts each of which extends in a row direction and is connected to respective row line .