Color display tube system with reduced spot growth

Details Color display tube system with reduced spot growth Color display tube system with reduced spot growth

1994-03-02

1996-10-15

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

348830, 335210, H01J 2970

Patent

active

055657320

ABSTRACT:
A color display tube system having an electron gun producing three co-planar electron beams which are non-convergent, i.e. parallel or divergent. A convergence element located at a distance from the electron gun and coaxial with the tube axis then produces convergence of the electron beams at the display screen by generating a static 45.degree. 4-pole field. This combination reduces growth of the scanning beam spot in the horizontal direction at the ends of the horizontal axis, which is a problem encountered with electron guns which are convergent.

REFERENCES:
patent: 4405910 (1983-09-01), Ohtsu
patent: 4961021 (1990-10-01), Oguro et al.
patent: 5182487 (1993-01-01), Ohtsu

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