Word: photoconductor
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Dates: during 1950-1950
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...lens focuses the scene being viewed on the front side of the photoconductor. A slender beam of electrons from an "electron gun" scans the rear side of the photo-conductor. When the electrons hit a brightly lighted area, a lot of them pass through. When they hit dark parts, only a few of them pass through. The transparent conducting layer collects the escaping electrons and passes them on in the form of a "video" current whose rapid fluctuations represent the light and shade of the picture. An ordinary television set turns the current into a copy of the scene which...
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