Electron gun for a color picture tube

Details Electron gun for a color picture tube Electron gun for a color picture tube

1994-11-30

1998-05-19

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2952

Patent

active

057540144

ABSTRACT:
The present invention discloses an improved electron gun for a color picture tube.
The present gun having a triple electrode part, a prefocusing lens part for preliminarily focusing and accelerating the electron beam from the triple electrode part, and a main lens part for finally focusing and accelerating the beam from the prefocusing lens part, is characterized in that the prefocusing lens part comprises a plurality of focusing lenses for forminig at last one quadrapole lens, and two different focusing voltages each of which being dynamically changed synchronized with the deflection signal, are selectively applied to each focusing electrode. Thus, a uniform beam section can be obtained all over the screen.

REFERENCES:
patent: 4825120 (1989-04-01), Takahashi
patent: 5347202 (1994-09-01), Stil
patent: 5386178 (1995-01-01), Son et al.
patent: 5404071 (1995-04-01), Son
Shirai & Noguchi, Reduction of Dynamic Focus Voltage in Color CRTs, (Hitachi, Ltd. Japan), 1991 SID International Symposium Digest of Technical Papers, pp. 695-698.

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