| 摘要 |
PURPOSE:To drive a circuit without receiving influence due to the impedance of a deflecting yoke and to prevent deflecting amplitude from changing even by changing a scanning time by connecting a part where a resistor, a capacitor, and a negative resistor are connected in series in parallel with a coil. CONSTITUTION:The part where the resistor R, the capacitor C, and the negative resistor RN are connected in series is connected in parallel with the coil of the deflecting yoke 1, and the impedance of the deflecting yoke 1 is measured by an impedance measuring instrument 7 prior to the operation of a scanning circuit, and after the constant of the resistor R is adjusted so as to negate a reactance component, the operation is started. Also, a residual reactance component is detected by measuring the voltage and the current of the deflecting yoke 1 during the operation, and the negative resistor RN is adjusted by a residual reactance correcting means 10. In such a way, it is possible to permit a saw-tooth wave current with superior linearity to flow, and the influence due to a back electromotive force can be eliminated, therefore, control with a low source voltage can be performed. |
