Pincushion correction circuit

Details Pincushion correction circuit Pincushion correction circuit

1975-10-02

1977-08-09

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H01J 2970, H01J 2976

Patent

active

040413543

ABSTRACT:
In a vertical deflection circuit in which a capacitor in parallel with a pair of vertical deflection coils is charged by respective decreasing and increasing amounts of horizontal rate energy during respective first and second portions of a vertical scan interval for providing a substantially linear vertical sawtooth current through the vertical coils, a resonant circuit tuned to approximately the horizontal rate is coupled in parallel with the capacitor and a portion thereof is serially coupled with the vertical coils for providing a horizontal rate current component of such a phase in the vertical coils as to correct for top and bottom pincushion distortion.

REFERENCES:
patent: 3444423 (1969-05-01), Marshall
patent: 3648099 (1972-03-01), Otten et al.
patent: 3916254 (1975-10-01), Worster et al.

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