1) Image orthicon 2) Television pickup tube 3) Television-camera tube 
(from the article `television`) ...States by Vladimir K. Zworykin (the Iconoscope) in 1924 and by Philo T. Farnsworth (the Image Dissector) in 1927. These early inventions were soon ...
a low-velocity photoemissive camera tube in which the beam scans a mosaic capable of storing an electric charge pattern
An orthicon is a form of television camera tube in which the optical image to be transmitted is projected on a photo-sensitive mosaic on the far side of a transparent signal plate, a charge pattern thus being produced on the mosaic.
[n] - a now obsolete picture pickup tube in a television camera
image orthicon 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
a camera tube, more sensitive than the iconoscope, in which a beam of low-velocity electrons scans a photoemissive mosaic.