| 摘要 |
An electrical power efficiency of the driving circuit is improved. The OP amplifier in the control arithmetic circuit compares a controlling amount with an added value of a target value and an AC signal and then outputs the comparing signal to the driving circuit. Since the transistor in the driving circuit is controlled in switching by the comparing signal, its loss of electrical power is reduced. Accordingly, an electrical power efficiency of the driving circuit is improved. In addition, the driving circuit drives the actuator section, a controlling amount of the actuator is detected by the position sensing unit and it is fed back as the controlling amount to the controlling arithmetic circuit.
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