Two-dimensional image readout device

A two-dimensional image readout device comprising:

• a sensor device including an insulating substrate, a plurality of parallel Y electrodes of conductive material, a plurality of X electrodes of conductive material disposed in a direction normal to said Y electrodes with a spacing therebetween, and a photoconductive layer interposed in said spacing between said Y and X electrodes, at least one of said Y and X electrodes being made of transparent material;
• an optical system including a lens for directing to a surface of said sensor device an image portion to be read out, said image portion being selectively directed by said lens onto a region of one X electrode at a time;
• means for moving said optical system and said lens thereof along a path normal to said X electrodes to sequentially align said image portion with each respective X electrodes along said path;
• position detector means for detecting when the lens of said optical system is aligned with a respective one of said X electrodes and for identifying which X electrode is aligned with said lens;
• power supply means for supplying voltage to a selected portion of said photoconductive layer;
• and
• switch means for selectively connecting said voltage to the X electrode identified by said position detector means to read out an image portion in said photoconductive layer aligned with the identified X electrode.