Color cathode ray tube with deflection means

Details Color cathode ray tube with deflection means Color cathode ray tube with deflection means

1988-02-10

1989-07-04

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313440, H01J 2972

Patent

active

048454010

ABSTRACT:
In a color cathode ray tube, an in-line electron gun assembly is located in the neck of a vacuum envelope and vertical and horizontal magnetic coils are arranged on the outer surface of the funnel of the vacuum envelope. The vertical magnetic coil produces a vertical magnetic field which has an asymmetrical distribution relative to a horizontal axis within a deflection plane. The asymmetrical distribution is determined as a function of the screen position on which electron beams deflected from the horizontal axis of the screen land. The electron beams are thus subjected to a negative astigmatism by the vertical deflection magnetic field.

REFERENCES:
patent: 3800176 (1974-03-01), Gross et al.
patent: 4415831 (1983-11-01), Konosu
patent: 4433268 (1984-02-01), Arisato

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