Dynamic focus and astigmatism correction circuit

Details Dynamic focus and astigmatism correction circuit Dynamic focus and astigmatism correction circuit

1979-09-18

1981-02-03

Hubler, Malcolm F.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, H01J 2958

Patent

active

042491126

ABSTRACT:
A dynamic focus system for a cathode ray tube display system is described. In some cathode ray tubes an electrostatic or electromagnetic stigmator is driven by a correction signal derived from the beam deflection signals. The required signal is proportional to the product of the horizontal and vertical deflection signals. The described system incorporates a means for making the constant of proportionality independently adjustable for each quadrant of the cathode ray tube screen.

REFERENCES:
patent: 2951965 (1960-09-01), Durnal
patent: 3403289 (1968-09-01), Garry
patent: 3422305 (1969-01-01), Infante
patent: 3465137 (1969-09-01), Brouillette, Jr. et al.
patent: 3772566 (1973-11-01), Schwartz
patent: 3942067 (1976-03-01), Cawood
patent: 3943279 (1976-03-01), Austefjord
patent: 3961223 (1976-06-01), Ray et al.

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