Color display tube with reduced deflection defocussing

Details Color display tube with reduced deflection defocussing Color display tube with reduced deflection defocussing

1989-08-31

1991-05-21

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 15, 313414, 313449, H01J 2958

Patent

active

RE0335924

ABSTRACT:
Color display tube comprising an electron gun 5 of the in-line type. The electron gun 5 comprises a main lens which is constituted by a first focussing electrode 25 and a second focussing electrode 26. The first focussing electrode comprises sub-electrodes 27, 28 placed at a distance from each other between which an auxiliary electrode constituting an astigmatic element G.sub.AST is positioned. The auxiiary electrode G.sub.AST is connected during operation to means for applying a constant voltage, whilst at least the sub-electrode 28 forming part of the main lens is connected during operation to means for applying a control voltage. The control voltage may be a static voltage or a dynamically varying voltage, for example, a parabolic voltage which is in synchronism with the line deflection.

REFERENCES:
patent: 4334169 (1982-01-01), Takenaka et al.
patent: 4383199 (1983-05-01), Washino et al.
patent: 4473775 (1984-09-01), Hosokoshi et al.
patent: 4560910 (1985-12-01), Midland
patent: 4626738 (1986-12-01), Gerlach

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