Definition of image orthicon in English:

image orthicon

noun

Television
historical
  • A kind of television camera tube in which a flow of electrons, produced as in an image tube, strikes a thin glass sheet and forms a pattern of positive charges corresponding to the original image, the video signal being derived by an electron beam which scans the other side of the sheet.

Origin

1940s; earliest use found in Daily Mail (Hagerstown, Maryland).