CRT scan system dynamic focus circuit

Details CRT scan system dynamic focus circuit CRT scan system dynamic focus circuit

1992-09-11

1993-08-10

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2958

Patent

active

052352579

ABSTRACT:
A method and apparatus for generating a dynamic focus correction voltage signal for a cathode ray tube which comprises the steps of: generating horizontal and vertical scan counter signals, and inputting the counter signals to a dynamic output voltage generating means which produces an output voltage that is proportional to the distance the scan is from the center of the image on the CRT in both the vertical and the horizontal directions.

REFERENCES:
patent: 4598234 (1986-07-01), McKibben

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