Television line deflection arrangement

Details Television line deflection arrangement Television line deflection arrangement

1982-07-22

1984-11-13

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 60, H01J 2956

Patent

active

044828462

ABSTRACT:
A circuit arrangement for correcting tilt and bow distortions in a raster scan display comprising a series arrangement of a current limiting inductor and diodes poled in opposite directions, which series arrangement is connected in parallel with the line deflection coil. A transistor is connected in parallel with one diode. In the absence of a control signal for the transistor the circuitry shunting the deflection coil acts as a centering circuit with a static offset current being produced through said coil which produces a static magnetic bias in the direction of line deflecton. To correct the geometric distortion the transistor receives a field frequency signal input which modulates it impedance at field frequency to produce a modulated magnetic bias through the deflection coil.

REFERENCES:
patent: 4093895 (1978-06-01), Collette
patent: 4198591 (1980-04-01), Ohmori
patent: 4375046 (1983-02-01), Lehnert

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