Photoelectric target structure
The photoelectric target is very thin. In the vacuum glass tube, the side of the photoelectric target facing the scene is a signal board. It is a layer of transparent metal conductive layer sprayed on the glass board. It has the characteristics of uniform thickness, high transparency and good conductivity. The other side of the photoelectric target is the photoconductive layer (photocathode), which is composed of a layer of photosensitive semiconductor material evaporated on the signal board. 
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