Electron gun for color cathode ray tube

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

1990-06-29

1992-09-08

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313432, 313439, H01J 2956

Patent

active

051461331

ABSTRACT:
An electron gun for a color cathode ray tube having a structure that a plate electrode to be provided within the focusing electrode is given the structure adding the external portion and providing in parallel three elliptical apertures in place of providing the cutout portion at the external portion, a plate electrode to be provided within the acceleration electrode is given the structure providing the cutout portion at the external portion and the vertical axis including the center of external elliptical portion is arranged outside the center axis when the side electron beam enters the main lens is capable of correcting astigmatism and satisfying static convergence. Moreover, rotation and deformation of plate electrode during assembling of electrode can be prevented by providing the straight line portion to the side beam apertures, aberration of lens to be generated at the main lens portion can be reduced and focus characteristic can also be stablized.

REFERENCES:
patent: 4599534 (1986-07-01), Shirai et al.
patent: 4766344 (1988-08-01), Say
patent: 4833364 (1989-05-01), Izumida et al.

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