H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.2
H01J 31/26 (2006.01) H01J 29/48 (2006.01) H01J 31/38 (2006.01)
Patent
CA 1118831
ABSTRACT A television camera tube having an electron gun to generate an electron beam, which electron gun comprises, centred along an axis. successively a cathode, a first electrode having an aperture, a second electrode having an aperture, and a focus- ing lens to focus the electron beam on a photosensitive layer pro- vided on a signal plate. A potential distribution can be formed on the photosensitive layer by projecting an optical image on it and the signal plate provides electric signals corresponding to the optical image by scanning the photosensitive layer with an electron beam. The diameter of the aperture in the first electrode, which forms a first anode, is at least twice as large as the dia- meter of the aperture in the second electrode, which forms a second anode. The aperture in the first anode is so small that d lens field is formed between the first and second anodes which has nearly no influence on the cathode emission. A positive vol- tage of a few tens of volts is applied to the first anode and a positive voltage which is at least ten times higher and which is at least 100 volts is applied to the second anode.
321220
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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