Television camera tube

Details Television camera tube Television camera tube

H - Electricity

01

J

313/35.2

H01J 31/26 (2006.01) H01J 29/48 (2006.01) H01J 31/38 (2006.01)

Patent

CA 1194079

-9- ABSTRACT: "Television camera tube". A television camera tube comprising in an evacuated envelope (1) an electron gun (6) which, viewed in the direction of propagation of the generated electron beam (48) comprises successively a cathode (40), a grid (41), an anode (42) and a cylindrical electrode (45) with a diaphragm (46), of which anode a part extends sub- stantially perpendicularly to the electron beam. This part has an aperture (44) which on the side of the target is covered with a first metal foil (53), This metal foil has an aperture (54) at the area of the electron beam which has a diameter which is not more than 0.15 mm and not less than the diameter of the beam at that area. By covering the aperture (44) on the cathode side with a second metal foil (55), which foil has an aperture (56) having a diameter which is smaller than the diameter of the aperture in the first metal foil and which not less than the diameter of the electron beam at that area, interference in the recorded image as a result of a return beam is considerably reduced without increasing the interference resulting from secondary electrons.

419881

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