Patent attributes
A vertical deflection apparatus supplies a vertical deflection current to a vertical deflection coil to deflect an electron beam in the vertical direction of a screen. The apparatus includes: a vertical deflection current output circuit that outputs a vertical deflection current; a correction circuit that outputs a correction signal periodically changing in a parabolic shape in a horizontal scanning period to correct a north-south pincushion distortion; a modulation circuit that modulates the phase of the correction signal output from the correction circuit in a vertical scanning period; and a superimposition device that superimposes a correction current based on an output signal of the modulation circuit on the vertical deflection current. The correction circuit includes: a folded waveform generator; a turn-up waveform generator; and a correction signal generator that generates the correction signal having a peak corresponding to a turn-up point of a turn-up waveform generated by the turn-up waveform generator.
