Electron gun of a color picture tube for preventing astigmation

Details Electron gun of a color picture tube for preventing astigmation Electron gun of a color picture tube for preventing astigmation

1994-09-02

1997-08-12

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313425, 313428, 313432, H01J 2956

Patent

active

056568843

ABSTRACT:
An electron gun of a color picture tube which can make uniform beam spots on a screen by eliminating astigmation of electron beams caused by a self-convergence yoke is constructed by the use of the improved shapes of vertical blades or horizontal blades of astigmation correction electrodes. The electron gun includes a three electrode part having a plurality of in line electron beam emitting means for emitting electron beams, and control electrodes and an acceleration electrode for controlling the quantity of emission and forming a crossover of the electron beams, a plurality of focusing electrodes and positive electrodes forming a main electrostatic focusing lens for focusing the electron beam onto a screen, a four polar lens means having projections from forward ends on the four polar lens means positioned between a fixed voltage focusing electrode and a varying voltage focusing electrode, wherein the electron beam emitting means and the plurality of electrodes are in line with the tube axis spaced in a certain interval successively, said fixed voltage focusing electrode beam formed by applying a fixed voltage to at least one of the plurality of the focusing electrodes, and the varying voltage focusing electrode beam formed by applying varying voltage to at least one of the rest of the plurality of focusing electrodes.

REFERENCES:
patent: 4086513 (1978-04-01), Evans, Jr.
patent: 4142131 (1979-02-01), Ando et al.
patent: 4208610 (1980-06-01), Schwartz
patent: 4772827 (1988-09-01), Osakabe
patent: 5017843 (1991-05-01), Barten
patent: 5128586 (1992-07-01), Ashizaki et al.

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