| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving gear having an oscillatory wave actuator which makes possible highly accurate speed control with simple structure. SOLUTION: In a driving gear having an oscillatory wave actuator which obtains driving force by boosting an alternating signal with a transformer to impress it to the piezoelectric element of an oscillatory wave actuator, a coupling coefficient setting means is provided for setting the coupling coefficient between the primary and secondary sides of a transformer 3 to a required value. This coupling coefficient setting means should be structured either by providing a gap d of an arbitrary size on the magnetic path of the transformer 3 made of a magnetic body or by making adjustable to an arbitrary length the distance between the primary and secondary windings of the transformer 3. |
