Electron gun for color picture tube

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

1982-12-10

1986-04-08

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313460, H01J 2951, H01J 2962

Patent

active

045815607

ABSTRACT:
An electron gun used in a color picture tube having means for emitting three electron beams toward the fluorescent screen, and main lenses for focusing the electron beams on the fluorescent screen. The main lenses are constituted by two envelopes spaced out from each other and adapted to surround the electron beams, and two electrode plates located on the confronting end surfaces of the envelopes and provided with three apertures aligning on a line for conducting the three electron beams. At least one of the two electrode plates is recessed relative to another electrode plate and disposed inside the envelope, and the recessed electrode plate is structured such that non-rotational symmetry of the lens caused by the recess of the electrode is corrected.

REFERENCES:
patent: 2859378 (1958-11-01), Gundert et al.
patent: 3772554 (1973-11-01), Hughes
patent: 4370592 (1983-01-01), Hughes et al.
patent: 4429252 (1984-01-01), Vieland et al.
patent: 4490644 (1984-12-01), Shimoma et al.
patent: 4495439 (1985-01-01), Shimoma et al.

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