Electron gun for color-picture tube

Details Electron gun for color-picture tube Electron gun for color-picture tube

1989-03-16

1991-07-23

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313460, H01J 2951

Patent

active

050346520

ABSTRACT:
An electron gun for a color-picture tube includes adjacent low and high potential electrodes composing an electron lens, which electrodes have electron beam path holes horizonally formed with electric-field correcting members or raised portions. According to this construction, vertical equipotential lines are projected into the electrode so that the low potential electrode adds to electron beams a vertical focusing effect more strongly than a horizontal one and the high potential electrode adds to electron beams a vertical divergent effect more strongly than a horizontal one. The section of the electron beam in a deflection region has an ellipse shape whose major axis extends horizontally, resulting in suppressing a halo portion on the screen. The electron beam is properly focused horizontally and vertically so that the electron beam spot has a circular shape on the center of a screen. It results in improving the resolution on the periphery of the screen without having to lower the resolution on the center of the screen.

REFERENCES:
patent: 3970890 (1976-07-01), Linssen
patent: 4086513 (1978-04-01), Evans, Jr.
patent: 4678964 (1987-07-01), Peels
European Search Report No. EP 89302624.5 dated Jul. 11, 1989.
Patent Abstracts of Japan, vol. 3, No. 36 (E-100), to Muranishi, Jan. 1979.
Patent Abstracts of Japan, vol. 12, No. 162 (E-609) (3009), to Naiki, Nov. 1987.

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