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US 3,944,879 AGranted
Pin cushion distortion correction circuit
AssigneeSony Corporation
InventorMasao Suzuki
Life of this patent
Estimating the term…
Abstract
A pin cushion distortion correction circuit is disclosed in which a parallel circuit of a resistor and a diode is inserted into the base circuit of a driving transistor of a saturable reactor for the correction of left and right pin cushion distortions to increase a correction current corresponding to the central portion of a video screen.
Claims9
A correction circuit for correction of pin cushion distortion of the sides of a television raster, said circuit comprising:
- A. a horizontal deflection circuit;
- B. a source of signal synchronous with the vertical deflection frequency of said raster, said signal having a generally parabolic waveform;
- C. a saturable reactor connected to said deflection circuit to modify the horizontal deflection current to correct said pin cushion distortion;
- and
- D. a coupling circuit comprising:
- 1. an impedance connected between said signal source and said reactor to control the amplitude of said signal applied to control said reactor, and
- 2. unidirectionally conductive means connected to said impedance to control the effective value thereof during peak values of said signal to modify the waveform of said signal in order to correct for non-linear response of said reactor.
4 more elements
Dependencies are inferred from the claim text.