Electron gun for multigun cathode ray tube

Details Electron gun for multigun cathode ray tube Electron gun for multigun cathode ray tube

1989-04-12

1990-05-01

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 315382, H01J 2951

Patent

active

049221663

ABSTRACT:
An electron gun arrangement for color cathode-ray tubes comprising three cathodes for emitting electron beams, for example, for red, green and blue, and a main electron lens comprising three front electron lenses corresponding to the cathodes, respectively, and a back electron lens common to all the cathodes. Each front electron lens is formed with an aperture smaller than that of the back electron lens and is mounted so as to meet Fraunhofer conditions so that aberration is reduced. Electron beam transmitting apertures are formed in the grids forming the front electron lenses, respectively, with the respective center axes thereof parallel to each other, which makes it easy to manufacture the electron gun arrangement and enables accurate machining during manufacturing.

REFERENCES:
patent: 3619686 (1971-11-01), Miyaoka
patent: 4119883 (1978-10-01), Miyaoka
patent: 4230972 (1980-10-01), Bafaro
patent: 4528476 (1985-07-01), Alig
patent: 4701678 (1987-10-01), Blacker et al.
patent: 4704565 (1987-11-01), Blacker, Jr. et al.

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