Electron gun for reduction of glimmer

Details Electron gun for reduction of glimmer Electron gun for reduction of glimmer

1986-05-06

1988-05-10

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313447, 313449, 313458, H01J 2906, H01J 2962

Patent

active

047437960

ABSTRACT:
Electron gun for cathode ray tube, the electrostatic lenses of which comprise an electrode that remains at a high voltage after shut-down of the power supply of the tube, wherein in order to reduce the effect, apparent through an interference glimmer upon the screen on the K cathode of the high voltage remaining on the electrode after shutdown of the power supply, means for masking this voltage are provided that form part of an electron gun electrode of intermediary position between the first high voltage electrode and the cathode, and wherein preferably, the intermediary electrode has an elongated form according to the axis of the gun with two end walls, of which that turned towards the cathode has a greater thickness than the thickness of the opposite wall.

REFERENCES:
patent: 3374379 (1968-03-01), Maruyama et al.
patent: 3852608 (1974-12-01), Johanns et al.
patent: 4620134 (1986-10-01), Peels et al.
Patents Abstracts of Japan, vol. 8, No. 8(E-221)[1445], 13 Jan. 1984 & JP-A-58 175 244 and JP-A-58 175 245 (Mitsubishi Denki K.K.).

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