Beam focusing means for a CRT electron gun assembly

Details Beam focusing means for a CRT electron gun assembly Beam focusing means for a CRT electron gun assembly

1990-06-21

1991-07-23

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313414, 315 16, H01J 2962

Patent

active

050346547

ABSTRACT:
The gun comprises a cathode, a control grid, a first anode a second anode and a third anode. Preferably a beam width limiting aperture is provided in the first anode. In one example the current modulating voltage applied to the grid is 0 to -50V, the voltage applied to the first anode is +5 kV, the focus voltage applied to the second anode is +500V, and the EHT voltage applied to the third anode is +25 kV. A main focussing lens is formed by the second and third anodes, but the spacing of the first and third anodes is small so that the focussing effect is also substantially dependent on the voltage of the first anode. The field strength between the grid and first anode is high, which combined with the high first voltage produces a small crossover.

REFERENCES:
patent: 4201933 (1980-05-01), Hisada et al.
patent: 4374341 (1983-02-01), Say
P. Grivet, Electron Optics, pp. 384-385 (Permagon Press, 2d ed., 1972; translated by P. W. Hawkes) ("Grivet").
H. Moss, Narrow Angle Electron Guns and Cathode Ray Tubes, pp. 181-189 (Academic Press, 1968) ("Moss").

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