| 摘要 |
PROBLEM TO BE SOLVED: To provide a vertical deflection apparatus that can sufficiently correct vertical pin-cushion distortion without being affected of crosstalk from a horizontal deflection coil to a vertical deflection coil. SOLUTION: A parabola modulation circuit 12 performs amplitude modulation of a horizontal parabola signal HP by a vertical modulation signal VM by multiplying the horizontal parabola signal HP and the vertical modulation signal VM and the phase of the horizontal parabola signal HP is modulated in accordance with the vertical modulation signal VM. The modulated horizontal parabola signal HP1 is outputted to a correction current output amplifier 7. When an NS pin-cushion distortion on the CRT tube is right-left asymmetric, a horizontal parabola signal generation circuit 32 is set, so as to generate a right-left asymmetric horizontal parabola signal HP. By adjusting the value of n in the n power waveform generator in the horizontal parabola signal generation circuit 32, it is possible to correct the gull wing distortion. |
