noun
a now obsolete picture pickup tube in a television camera; 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 (Freq. 1)
• Syn: ↑orthicon
• Hypernyms: ↑television-camera tube, ↑television pickup tube
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noun : a camera tube that is similar to the iconoscope or the orthicon and uses secondary emission and electron multiplication to produce the voltages that are subsequently amplified and transmitted as television-picture signals
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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.
[1940-45]
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image orthicon noun
A television camera tube that converts the images it receives into electronic impulses which are transmitted as television signals
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Main Entry: ↑image
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image orthicon,
a very sensitive cathode-ray tube used in television cameras to convert light images into electronic impulses. It consists of an orthicon, an electron gun, and an electron multiplier. »
The standard tube in the United States for television cameras is the image orthicon (Kenneth Harwood).
Useful english dictionary. 2012.