| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving device that reduces the holding torque of an oscillatory wave motor and rotates an object to be driven by light operation for the enhancement of operability. <P>SOLUTION: A pan tilt camera includes: a camera unit 102, a pan unit 115, the oscillatory wave motor 103, 110, an encoder sensor 106, 113, and an encoder scale 107, 114. The oscillatory wave motor includes a piezoelectric element, an oscillator 2, a slider member 3, a rotor 4, and a shaft 10. When a user rotates the camera unit 102 or the pan unit 115, an encoder pulse is detected at the encoder sensor 106 (113). Therefore, a control unit 20 generates a pulse signal corresponding to a standing wave from an voltage-controlled oscillator 23 and supplies it to a driver A25 and a driver B26 through a driving pulse generator 24. That is, the control unit 20 carries out such control as to apply driving voltage to the piezoelectric element so that a standing wave is generated at the oscillator 2 of the oscillatory wave motor. <P>COPYRIGHT: (C)2007,JPO&INPIT |
