| 摘要 |
PROBLEM TO BE SOLVED: To reduce the loss of power consumption and to improve efficiency by selecting first power voltage in a scanning period and selecting second power voltage which is higher than first power voltage and which is constant voltage in a flyback period. SOLUTION: Offset voltage generation parts 13A and 13B, comparators 14A and 14B and chopper power sources 15A and 15B are provided. A power source part generating first power voltage + Vc which fluctuates so that it follows to voltage obtained by overlapping constant voltage with an amplified deflection signal Vin and a switch circuit 17 are provided. When a deflection signal Vout amplified by the switch circuit 17 is in the scanning period, first power voltage + Vc is selected and second power voltage + Vcch which is higher than first power voltage + Vc and which is constant voltage is selected in the flyback period. Then, they are supplied to signal amplification parts 11 and 12 as power voltage. |
