Focusing electrode assembly for a color cathode ray tube electro

Details Focusing electrode assembly for a color cathode ray tube electro Focusing electrode assembly for a color cathode ray tube electro

1989-12-29

1991-02-05

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313409, 313412, 313417, 313421, H01J 2951

Patent

active

049908227

ABSTRACT:
A three-beam unitized, in-line electron gun for a color cathode ray tube has a series of hollow, rectangulr-in-cross-section electrodes for the side-by-side accommodation of the three beams. A two-element anode electrode for the gun includes first and second cup-shaped elements each having an apertured electrode face. The second cup-shaped element is nested in the first element, and has a cup draw effective to provide a predetermined distance between the electrode faces when the cups are in nested relationship. The critical focusing and convergence of the gun can thereby be adjusted by the adjustment of the cup draw.

REFERENCES:
patent: 4181870 (1980-01-01), Stevens
patent: 4678964 (1987-07-01), Peels
patent: 4737682 (1988-04-01), Alig et al.

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