Electron gun for a color cathode-ray tube

Details Electron gun for a color cathode-ray tube Electron gun for a color cathode-ray tube

1990-11-21

1992-08-25

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313413, 313449, 315 16, H01J 2954

Patent

active

051421909

ABSTRACT:
An electron gun for a color cathode-ray tube includes a triode, a pre-stage auxiliary electrostatic focusing lens, a fourth grid electrode, a first accelerating/focusing lower electrode assembly, and a main electrostatic focusing lens formed between a first accelerating/focusing upper electrode assembly and a second accelerating/focusing electrode. In the electron gun, the electron beam horizontally extended by the magnetic quadrupole lens of the deflection magnetic field is compensated by vertically extending the horizontally extended electron beam before the deflection magnetic field is entered by the electrostatic quadrupole lens which varies according to the deflected amount of the electron beam and round beam sports obtained in the vicinity of the screen edge as well as at the center of the screen, so that the halo portions of a low electron density surrounding the core portion of a high electron density forming a beam spot is greatly reduced to obtain a good resolution characteristic.

REFERENCES:
patent: 4591760 (1986-05-01), Kimura
patent: 4935663 (1990-06-01), Shimoma et al.
patent: 5023508 (1991-06-01), Park

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