Twin-convex electron gun

Details Twin-convex electron gun Twin-convex electron gun

1994-03-14

1995-03-14

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

313414, H01J 2946, H01J 2956

Patent

active

053979591

ABSTRACT:
An electron gun for a cathode-ray tube has, in addition to its main lens, a triode with first and second grids as control electrodes. The thickness of the second grid, and the separation between the first and second grids, is at most one-half the diameter of the beam aperture in the second grid. These dimensions lead to formation of a prefocus lens with no concave lens component, hence with no beam diverging effect. The resulting triode aberration corrects spherical aberration in the main lens, so that the size of the beam spot focused on the screen has little tendency to increase with increasing beam current.

REFERENCES:
patent: 4496877 (1985-01-01), Kueny
patent: 5223764 (1993-06-01), Chen
"Projection Tubes for Professional Use", National Technical Report, vol. 28, No. 1--Feb. 1982, pp. 37-42.
"A New High Resolution Gun for Projection Tube", Suzuki et al.--National Technical Report, vol. 28, No. 1--Feb. 1982, pp. 132-142.

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