#television-camera_tube__television_pickup_tube  a tube that rapidly scans an optical image and converts it into electronic signals
  supertype:  #thermionic_vacuum_tube__tube__vacuum_tube__thermionic_tube__electron_tube__thermionic_valve  electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
  part of:  #television_camera
  subtype:  #iconoscope  the first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin
  subtype:  #image_orthicon__imageorthicon__orthicon  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

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