| 摘要 |
PURPOSE:To reduce adjustment and the number of components by changing a sawtooth voltage by making follow a source voltage. CONSTITUTION:The perpendicular parabolic component of a voltage at a power source terminal 2 can be eliminated with a resistor R11 and a capacitor C6, and a current which charges a capacitor C7 flows via a resistor R12. The sawtooth voltages appear at the emitters of transistors(TR) Q2, Q3, and a TR Q9 is turned on, thereby, they are integrated with an integration circuit 7 in a vertical flyback period via a buffer amplifier 10, then, a parabolic wave voltage is supplied to the base of a TR Q7 via a capacitor C9 and a volume VR5. Therefore, a parabolic quantity can be changed by adjusting the volume VR7. In a vertical scanning period, since the voltages in almost the same direction can be obtained in high definition TV and NTSC directions, it is enough to prepare only the volume VR5 as a volume for parabolic quantity setting, not requiring a displayable system, and the adjustment by either system only for one time is performed. |
