North-south pincushion corrected deflection circuit

Details North-south pincushion corrected deflection circuit North-south pincushion corrected deflection circuit

H - Electricity

01

J

350/102, 355/9

H01J 29/56 (2006.01) H04N 3/233 (2006.01)

Patent

CA 1263744

RCA 80958/81200 Abstract A field deflection amplifier generates a field deflection current in a field deflection winding. An LC resonant circuit is coupled to the deflection winding and to an output switching amplifier. A control circuit switches conductive states of the amplifier at a line rate, with a 50% duty cycle, to excite the LC resonant circuit into providing a line rate correction current for the field deflection winding. The control circuit varies the modulation envelope of the field deflection current at a field rate in a generally saw-tooth manner to provide north-south pincushion correction. When used in conjunction with raster scanning in a square-planar picture tube, the modulation envelope is nonlinearly waveshaped to take into account the aspherical nature of the picture tube faceplate.

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