Vidicon type camera tube

Details Vidicon type camera tube Vidicon type camera tube

1980-12-11

1982-12-14

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313389, H01J 2946, H01J 2956, H01J 3138

Patent

active

043639968

ABSTRACT:
A vidicon type camera tube comprising a beam current control section including a thermionic cathode, a first grid having an aperture of diameter d.sub.1, a second grid having an aperture of diameter d.sub.2 and a beam disc having a diaphragm of diameter d.sub.3 disposed at a distance of l along the tube axis from the second grid. The tube further comprises a main lens section constituted of cylindrical electrodes. The diameters d.sub.1, d.sub.2 and d.sub.3 and the distance l are so determined that the value of (d.sub.2 /l)(d.sub.3 /d.sub.1).sup.2 may lie in the range where the difference of the effective cathode loading is positive.

REFERENCES:
patent: 3866079 (1975-02-01), Schut
patent: 3928784 (1975-12-01), Weijland
patent: 4268777 (1981-05-01), Roosmalen

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