Inductorless pincushion correction circuit

Details Inductorless pincushion correction circuit Inductorless pincushion correction circuit

1982-12-03

1985-01-29

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

044968825

ABSTRACT:
An internally generated raster scanning circuit includes self correction for pincushion distortion by multiplying the horizontal parabolic wave form by the vertical saw-tooth wave form. The multiplier is biased to provide the required 180.degree. phase shift at the midpoint of the waveform. The multiplied signals are coupled back to an input of the existing power amplifier and a corrected current is then supplied to the vertical yoke coil, requiring no added reactor transformer. The balance or ratio of the top and bottom correction currents can be adjusted as required by a simple control in the multiplier circuit.

REFERENCES:
patent: 2880358 (1959-03-01), Parker
patent: 3968403 (1976-07-01), Ogawara
patent: 4039899 (1977-08-01), Battjes et al.
patent: 4048544 (1977-09-01), Haferl
patent: 4101814 (1978-07-01), Haferl
patent: 4169988 (1979-10-01), Fecht
patent: 4305023 (1981-12-01), Willis
patent: 4346327 (1982-08-01), Barten

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