Dual axis dynamic focus of an electron beam in a display monitor

Details Dual axis dynamic focus of an electron beam in a display monitor Dual axis dynamic focus of an electron beam in a display monitor

1989-06-26

1991-09-10

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

G09G 104, H01J 2958

Patent

active

050476971

ABSTRACT:
A circuit within a display monitor is used to generate a focal voltage used to vary the focal length of an electron beam of a cathode ray tube. The circuit utilizes horizontal current placed on a horizontal deflection yoke of the cathode ray tube and utilizes vertical current placed on a vertical deflection yoke of the cathode ray tube. The circuit includes a horizontal capacitor, a vertical capacitor, a first amplifier, a second and a summing device. The horizontal capacitor is connected to the horizontal deflection yoke. Similarly, the vertical capacitor is connected to the vertical deflection yoke. The voltages across each of the vertical capacitor and the horizontal capacitor are amplified and summed to obtained the focal voltage.

REFERENCES:
patent: 4587465 (1986-05-01), Truskalo
patent: 4633144 (1886-12-01), McKibben
patent: 4891564 (1990-01-01), Crowley
Display System Design Author Sol Sherr 1970 Library of Congress Catalogue Card No: 78-96045 pp. 234, 374-376; 416-419.

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