Electron gun assembly having a quadruple lens for a color cathod

Details Electron gun assembly having a quadruple lens for a color cathod Electron gun assembly having a quadruple lens for a color cathod

1995-09-19

1997-09-02

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313413, 315 15, 315382, H01J 2958

Patent

active

056636091

ABSTRACT:
A color cathode ray tube apparatus is provided with an electron gun assembly. In the electron gun assembly, three electron beams, which are emitted from cathodes of an in-line arrangement, are accelerated and converged onto a phosphor screen by an electron lens system of the electron gun assembly. The electron lens system is constituted by a plurality of grid electrodes and includes individual electron lenses and a common electron lens. Each of the individual electron lenses has first and second lens powers in horizontal and vertical planes, respectively. Each of the electron beams is diverged in the horizontal plane and converged in the vertical plane by the corresponding individual electron lens due to the first and second lens powers. The common electron lens has third and forth lens powers in the horizontal and vertical planes, respectively. The electron beams from the individual electron lenses are converged in the horizontal plane by the common electron lens due to the third lens power and each of the electron beams diverged by the common electron lens due to the fourth lens power.

REFERENCES:
patent: 4786845 (1988-11-01), Kato et al.
patent: 5061881 (1991-10-01), Suzuki et al.
patent: 5157301 (1992-10-01), Tominaga et al.
patent: 5241237 (1993-08-01), Misono et al.
patent: 5341070 (1994-08-01), Son
patent: 5367230 (1994-11-01), Iguchi et al.

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