Deflection circuit for a television picture tube

Details Deflection circuit for a television picture tube Deflection circuit for a television picture tube

1989-09-14

1991-01-29

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H01J 2956

Patent

active

049889273

ABSTRACT:
A deflection circuit for a television picture tube comprises a horizontal generator producing a first, symmetrical output current. A corrective current is generated from the first output current. The corrective current and the first output current change in value oppositely to one another at times. A vertical generator produces a second output current. The second output current and the corrective current are summed to form a composite current having a stairstep configuration. An amplitude control circuit for the composite current adjusts horizontal segments of the stairstep. A composite control signal for the amplitude control circuit is developed from the horizontal and vertical generators. A vertical sweeping coil is coupled to the amplitude control circuit and controlled by the composite current.

REFERENCES:
patent: 3662102 (1972-05-01), Herndon
patent: 4176300 (1979-11-01), Waehner
patent: 4672449 (1987-06-01), Kraus et al.
patent: 4680599 (1987-07-01), Wertz et al.
patent: 4766354 (1988-08-01), Oliver
Murphy, A. S.; Bidirectional Scan for CRT; IBM Tech. Disclosure Bulletin, vol. 21; No. 12; May 1979, pp. 5025-5026.
Kraus, Uwe E.; Symmetric Line Deflection for Colour TV Receivers with Enhanced Picture Quality; IEEE Transactions on Consumer Electronics; vol. CE-31; No. 3; Aug. 1985, pp. 255-261.

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