Color picture tube having an improved electron gun with expanded

Details Color picture tube having an improved electron gun with expanded Color picture tube having an improved electron gun with expanded

1980-02-28

1982-02-23

Lieberman, Eli

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313409, H01J 2950

Patent

active

043170650

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 gun electrodes that form the main focus lens. The main focus lens is formed by two spaced electrodes. Each electrode includes a member having a plurality of apertures therein equal to the number of electron beams and a lens plate spaced from the member which is electrically connected to the member. The lens plates of the two electrodes are adjacent and spaced from each other and are located between the members of the electrodes having a plurality of apertures therein. Each lens plate includes a signal large hole therein formed by a plurality of overlapping apertures equal to the number of electron beams.

REFERENCES:
patent: 3932786 (1976-01-01), Campbell
patent: 4086513 (1978-04-01), Evans
patent: 4275332 (1981-06-01), Ashizaki et al.
Home Furnishing Daily, Matsushita Will Use Its New Electron Gun; 9-3-79.
Ken-Ichi Doi, "Future Color TV CRTs Approach Perfection", Journal of Electronics Engineering, 11-79.
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, S. Ashizaki and H. Suzuki.

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