image-orthicon

image orthicon

noun Television.
a camera tube, more sensitive than the orthicon, in which an electron image generated by a photocathode is focused on one side of a target that is scanned on its other side by a beam of low-velocity electrons to produce the output signal.

Origin:
1940–45

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n
a television camera tube in which electrons, emitted from a photoemissive surface in proportion to the intensity of the incident light, are focused onto the target causing secondary emission of electrons

Collins English Dictionary - Complete & Unabridged 10th Edition
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