Cathode ray tube apparatus

Details Cathode ray tube apparatus Cathode ray tube apparatus

1984-03-21

1986-05-27

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

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

313449, H01J 2946, H01J 2956

Patent

active

045917604

ABSTRACT:
An electron gun has five grids (G.sub.1, G.sub.2, G.sub.3, G.sub.4, G.sub.5), and an additional grid (G.sub.2s) is disposed between the second grid and the third grid (G.sub.3) and is impressed with a potential lower than that of the second grid (G.sub.2), and a trimming electrode (G.sub.5a) with a trimming aperture 14 is provided in the fifth grid (G.sub.5), and by trimming the outer shell part of the electron beam having crossed the electron gun axis twice a very small beam spot is produced.

REFERENCES:
patent: 3143685 (1964-08-01), Glyptis
patent: 3806758 (1974-04-01), Lundqvist
patent: 4383199 (1983-05-01), Washino et al.
patent: 4481445 (1984-11-01), Gorski

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