Multi-focusing type electron gun for color cathode ray tubes

Details Multi-focusing type electron gun for color cathode ray tubes Multi-focusing type electron gun for color cathode ray tubes

1992-02-12

1994-03-01

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313460, 313425, H01J 2956

Patent

active

052910946

ABSTRACT:
In a multi-focusing type electron gun in which first through eighth electrodes and a shield cup are provided, the sixth electrode which forms the center of a second unipotential lens is formed by a primary electrode and a corresponding secondary electrode. The center aperture of the primary electrode has a larger inside diameter than lateral apertures thereof, which is equal to the inside diameter of the lateral apertures of the secondary electrode. The center aperture of the secondary electrode has a comparatively smaller inside diameter than the lateral apertures thereof but which is equal to the inside diameter of the lateral apertures of the primary electrode, so that a voltage difference of the second unipotential lens becomes uniform to obtain an expanded focus lens.

REFERENCES:
patent: 4370592 (1983-01-01), Hughes et al.
patent: 4728859 (1988-03-01), Natshuhara et al.
patent: 4833365 (1989-05-01), Shirai et al.

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