Patent ID: 7612473

Claim:
The driving device, comprising: a magnetostrictive actuator that drives a load member based on a driving signal; a sensor that detects an action of the load member; and a compensation unit that performs feedback compensation on the driving signal which the magnetostrictive actuator receives based on a detection signal that is received from the sensor, wherein the compensation unit includes a phase compensation circuit that locks a phase of the detection signal from the sensor into a phase of the driving signal; a low-pass filter that removes from the detection signal of the sensor a high-frequency component thereof; an equalizer that previously corrects a fluctuation in frequency characteristic of the driving signal, said fluctuation occurring at the feedback compensation; and a subtracter that subtracts the detection signal of the sensor, said detection signal having been phase-locked in the phase compensation circuit and the high-frequency component of the detection signal having been removed by the low-pass filter, from the driving signal, a frequency characteristic of which has been corrected by the equalizer, thereby getting the compensated driving signal.