Electron gun body for a color cathode ray tube

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

1994-12-20

1996-12-03

Patel, Nimeshkumar

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313409, 313449, H01J 2962

Patent

active

055811477

ABSTRACT:
An electron gun body for a color cathode ray tube includes an electron beam forming region formed by cathodes, first and second grids, and a main focusing lens having first and second accelerating and focusing electrodes for substantially focusing three electron beams from the electron beam forming region. The first and second accelerating and focusing electrodes are provided with through holes for passing the three electron beams and upper rims respectively bent from the outer circumferences of the electrodes toward the through holes, in which a first inclined extension electrode having a vertically-provided sloped portion and bottom portion, and a center hole opened to reach a bent plane of the sloped portion in the bottom portion is installed into the first accelerating and focusing electrode to fix one side of the first inclined extension electrode to connect with an inwardly-bent portion of the one upper rim, and a second inclined extension electrode having projections parallel in both directions on the same plane of a head portion is installed into the second accelerating and focusing electrode, while forming the vertical inner diameter of the projection to be smaller than that of the upper rim, to fix one side of the second inclined extension electrode to connect with an inwardly-bent portion of the other upper rim. Thus, astigmatism is eliminated without using a separate correction electrode to improve resolution on the periphery of a screen.

REFERENCES:
patent: 4542318 (1985-09-01), Say
patent: 4599534 (1986-07-01), Shirai et al.
patent: 5023508 (1991-06-01), Park
patent: 5146133 (1992-09-01), Shirai et al.
patent: 5196762 (1993-03-01), Go

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