| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress power consumption as much as possible, independent of changes in characteristics and load of a vibration type actuator. <P>SOLUTION: A vibration type actuator 4 relatively drives an elastic body and a contact body that contacts the elastic body by applying a frequency signal to an electric-mechanical energy conversion element 15 to excite vibration on the elastic body. The control device of the actuator comprises signal generating means 2, 3 for generating frequency signal, a vibration detecting means 8 for detecting vibration state of the elastic body, a phase difference detecting means 9 for detecting phase difference between the signal generated by the signal generating means and the output signal from the vibration detecting means, and a control means 1 which controls a voltage and frequency of the frequency signal generated by the signal generating means. The control means controls the voltage of frequency signal based on the phase difference detected by the phase difference detecting means. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
