| 摘要 |
Disclosed is a piezoelectric actuating device for driving an object in a straight-line or linear manner. A driving shaft is perpendicularly coupled to the maximum displacement point of a piezoelectric vibration member. When a sawtooth-wave driving voltage is applied to the piezoelectric vibration member, the driving shaft repeatedly advances and retreats in accordance with a smooth impact driving mechanism (SIDM). An elastic friction driving unit, which is connected to or formed integrally with an end or side of the driving shaft, and which comes into elastic contact with a predetermined portion of the object being driven, reciprocates in accordance with the advancing and retreating motion of the driving shaft to transfer frictional force to the object being driven. During the above-described process, the piezoelectric actuating device provides the object being driven with driving force by means of the difference between the inertial force and frictional force between the piezoelectric actuating device and a guide surface of the object being driven. As a result, the object being driven (in the event a piezoelectric actuator is fixed) or the piezoelectric actuating device (in the event the object being driven is fixed) linearly moves (in the event the object being driven has a linear guide surface) or rotates (in the event the object being driven has an annular guide surface) in a desired direction. The piezoelectric actuating device can further comprise a vibration support member which is coupled to a vibration operating point of the piezoelectric vibration member so as to support the piezoelectric vibration member such that the piezoelectric vibration member can vibrate. In addition, the piezoelectric actuating device can further comprise a driving shaft guide unit which supports the outer surface of the driving shaft such that the driving shaft can advance and retreat, and the deviation of the advancing and retreating motion of the driving shaft can be minimized. When the level of the driving shaft and the level of the elastic friction driving unit differ from each other, the linear migration distance of the object being driven can be elongated. |
