| 摘要 |
PROBLEM TO BE SOLVED: To realize low-speed drive, the efficient utilization of a battery capacity, and a stable operation of an actuator which moves a driven element in the prescribed direction by applying an AC drive signal to a displacement device, such as a piezoelectric device, etc., to make the displacement device vibrate. SOLUTION: Information concerning the amplitude of the vibration of the displacement device, for instance a current applied to the piezoelectric device, is monitored. When the peak value of the current reaches a value which is not larger than a target value, the application of a drive signal is started, and when the peak value reaches a value larger than the target value, the application of the driving signal is discontinued. |
