Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
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
Blum Theodore M.
Briody Thomas A.
Streeter William J.
U.S. Philips Corporation
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