Color picture tube having an improved inline electron gun with a

Details Color picture tube having an improved inline electron gun with a Color picture tube having an improved inline electron gun with a

1980-10-29

1983-01-25

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313449, 313460, H01J 2950, H01J 2956

Patent

active

043705928

ABSTRACT:
The present invention relates to an improvement in a color picture tube having an inline electron gun, for generating and directing a plurality of electron beams along coplanar paths toward a screen of the tube. The gun includes a main focus lens for focusing the electron beams. The improvement comprises a change in the two spaced gun electrodes that form the main focus lens. Each electrode includes a plurality of apertures therein equal to the number of electron beams. Each electrode also includes a peripheral rim with the peripheral rims of the two electrodes facing each other. The apertured portion of each electrode is located within a recess set back from the rim. The recess has substantially straight wall sections parallel to the paths of the electron beams.

REFERENCES:
patent: 2732511 (1956-10-01), Dichter
patent: 3932786 (1976-01-01), Campbell
patent: 3987328 (1976-10-01), Yoshida
patent: 4049991 (1977-09-01), Collins
patent: 4086513 (1978-04-01), Evans
patent: 4275332 (1981-06-01), Ashizaki et al.
patent: 4317065 (1982-02-01), Hughes
1980, IEEE Chicago Spring Conference on Consumer Electronics, "A New Approach to a High Performance Electron Gun Design for Color Picture Tubes", by K. Hosokoshi et al.

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