Adjustable pincushion correction circuit

Details Adjustable pincushion correction circuit Adjustable pincushion correction circuit

1974-02-27

1976-03-16

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, 315371, H01J 2970, H01J 2976

Patent

active

039448843

ABSTRACT:
In a television receiver, a saturable transformer has three windings, one being in series with a horizontal deflection coil to introduce a parabolic reactance variation to correct for side pincushion distortion. An adjustable correction circuit includes a transistor integrator for producing in another winding of the saturable transformer a vertical parabolic current. The last winding of the saturable transformer is coupled through a pair of switching diodes to a pair of variable inductors. The diodes conduct alternately at the beginning and end of the vertical scanning period. The variable inductors may be mounted coaxially with a common movable core to allow inverse side correction, or may be mounted separately with separate movable cores to allow independent side correction.

REFERENCES:
patent: 3452243 (1969-06-01), Knorr
patent: 3681725 (1972-08-01), Ikeuchi
patent: 3748531 (1973-07-01), Boekhorst
patent: 3814982 (1974-06-01), Sakurai

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