Side pincushion correction circuit
AssigneeRCA Corporation
InventorWolfgang Friedrich Wilhelm Dietz
Life of this patent
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Abstract
Horizontal rate energy obtained from a winding of the horizontal output transformer of a deflection system is rectified for providing operating current for the vertical deflection output stage. A variable impedance is in shunt with a coil which is in series with a rectifier coupled to the transformer winding. The impedance is controlled by a parabolic vertical rate waveform to alter the charging rate of a storage capacitor coupled to the rectifier for supplying the vertical operating current. The parabolically varying rectifier current alters the loading of the horizontal transformer and thereby alters the horizontal scanning current at a vertical rate in a manner to correct for side pincushion distortion.
Claims7
A raster correction circuit comprising:
- a line frequency generator;
- a line frequency deflection winding coupled to said line frequency generator;
- a line frequency output transformer coupled to said line frequency generator;
- power supply means including rectifying means coupled to a winding of said line frequency output transformer for producing a direct current voltage from line rate energy in said winding;
- a field frequency generator coupled to said rectifying means for obtaining operating current therefrom;
- and
- active current conducting means coupled in circuit with said rectifying means and responsive to signals derived from said field frequency generator for providing a variable impedance path for current in said rectifying means at a field deflection rate for loading said transformer and varying line rate current in said deflection winding in a manner to correct for raster distortion.
A raster correction circuit comprising:
- a line frequency generator;
- a line frequency deflection winding coupled to said line frequency generator;
- a line frequency output transformer coupled to said line frequency generator;
- power supply means including rectifying means and impedance means coupled in circuit with said winding for rectifying line rate energy in said winding;
- a field frequency generator coupled to said power supply means for obtaining operating current therefrom;
- and
- control means including active current conducting means coupled in circuit with said impedance means and responsive to signals derived from said field frequency generator for providing a variable impedance path for current in said impedance means for altering current in said rectifying means at said field frequency rate for loading said winding and thereby altering said line rate current in said deflection winding in a manner to correct raster distortion.
A raster correction circuit comprising:
- a line frequency generator;
- a line frequency deflection winding coupled to said line frequency generator;
- a line frequency transformer coupled to said line frequency generator;
- series connected rectifier means and inductance means coupled to a winding of said transformer;
- series connected storage means and waveshaping means coupled to said rectifier means for storing rectified line frequency energy obtained therefrom;
- a field deflection generator coupled to said storage means for obtaining operating current therefrom;
- and
- an active current conducting device coupled in shunt with said rectifier means and said inductance means and having a control electrode coupled to said waveshaping means and responsive to field rate signals developed therein for providing a varying impedance at said field rate for controlling the line rate current flow through said rectifier means for loading said transformer and thereby altering the line rate scanning current through said line frequency deflection winding at said field rate in a manner to correct for side pincushion distortion.
Dependencies are inferred from the claim text.