| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive device for a vibration wave motor capable of performing silent drive even at motion picture photographing.SOLUTION: In a drive device for a vibration wave motor, to an electromechanical conversion element 13 of a vibration wave motor 10 having a vibrator 11 on whose drive surface 12a a drive force is generated by the electromechanical conversion element 13, and a relative motion member 15 having a slide surface in pressure-contact with the drive surface 12a and driven by the drive force, from a state where two drive signals, which have substantially the same frequency and have a phase difference from each other, is applied to drive the relative motion member 15 in a first direction, the frequency of the drive signals is increased, and the phase difference between the two drive signals is changed in a state where the movement of the relative motion member 15 is substantially stopped. The frequency of the drive signals is reduced to perform a direction changing operation for changing the movement direction of the relative motion member 15 to a second direction reverse to the first direction. The drive signals are obtained by overlapping a fundamental wave and a high harmonic wave having a frequency of the fundamental wave with each other. |
