| 摘要 |
PURPOSE:To reduce the fluctuation of horizontal amplitude due to the change of brightness of a picture by changing the DC component of a parabolic signal for modulation corresponding to the size of a horizontal flyback pulse. CONSTITUTION:A rectifier circuit 16 is provided which superimposes the DC component on the output of a parabolic signal generation circuit 13. Namely, in the rectifier circuit 16, a tertiary winding L3 is provided at a flyback transformer TF, and a DC voltage Vd can be obtained by rectifying and smoothing a voltage generated at the tertiary winding L3 with a constant voltage diode ZD1 for slicing, a rectifier diode D3, and a smoothing capacitor C8. The DC voltage is added on the base of a transistor Q2 from the connecting point of series resistors R4 and R6 connected between a terminal T4 and the capacitor C8 via a resistor R5. Therefore, since the DC component of the parabolic signal for modulation can be varied corresponding to the size of the horizontal flyback pulse, the reduction of a deflecting current can be prevented occurring even with the operation of a high voltage stabilization circuit 14. In such a way, it is possible to reduce the fluctuation of the horizontal am plitude with the horizontal amplitude corrective effect of a horizontal deflection circuit even when the brightness of the picture changes. |
