PINCUSHION CORRECTION CIRCUIT UTILIZING A DC-REGULATED POWER SUPPLY

摘要

A circuit for correcting side pincushion distortion in a color television receiver having a cathode-ray tube and associated horizontal and vertical deflection circuits for generating a raster thereon. The circuit comprises a power supply for developing a DC potential and a regulating circuit for the supply which includes a transistor device, the collector-emitter path of which is serially interposed between the output of the supply and the energizing electrode of an output transistor in the horizontal deflection circuit. An integrating network, coupled to the vertical deflection circuit, derives a parabolic wave signal which is applied to the DC potential translated by the regulating transistor. The parabola-modulated DC potential applied to the energizing electrode of the horizontal output transistor changes the magnitude of horizontal scanning current in the horizontal deflection circuit parabolically as the electron beams are vertically deflected from the top of the raster to the bottom.