orthicon

Noun
  1. 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 (synset 103862248)
    is a type of: television pickup tube, television-camera tube - a tube that rapidly scans an optical image and converts it into electronic signals
    same as: image orthicon

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