North-south pincushion distortion correction circuit

Details North-south pincushion distortion correction circuit North-south pincushion distortion correction circuit

1977-08-31

1978-10-03

Tubbesing, T.H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315393, H01J 2956

Patent

active

041186567

ABSTRACT:
A first capacitor is coupled in parallel with a vertical deflection winding and the two are coupled to a source of horizontal rate energy by means which permit the capacitor to be charged with decreasing and increasing amounts of horizontal rate energy during respective first and second portions of each vertical deflection interval. The discharge of the first capacitor through the winding produces the vertical rate sawtooth scanning current therein. A second capacitor and impedance means coupled in circuit with the first capacitor are responsive to the horizontal rate energy to alter the shape of the generally sawtooth shaped horizontal rate voltage developed across the capacitors for producing a substantially symmetrical horizontal rate parabolic current component superimposed on the vertical rate sawtooth scanning current during each horizontal trace interval during the vertical trace interval for effecting north-south pincushion distortion correction current in the vertical winding.

REFERENCES:
patent: 4041354 (1977-08-01), Haferl

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