| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric actuator which can achieve stable and highly efficient drive using a small and thin structure. SOLUTION: In order to drive to load by the piezoelectric actuator, vibration assisting part 50 comprising notches are formed in a vibration plate 10 at positions corresponding to knots of bending vibration actually generated in the vibration plate 10. If a drive signal is applied to an electrode part on a piezoelectric device, the piezoelectric device is expanded/contracted in the longitudinal direction, i.e., in the horizontal direction in Figure, and longitudinal vibration is excited. If such a longitudinal vibration is excited, the bending vibration is induced by a mechanical cause such as imbalance in the weight of the vibration plate 10. Further, since the bending vibration is easily induced by the vibration assisting parts 50, the bending vibration with a frequency corresponding to a load is positively generated, particularly between a support element 11 and a contact part 36, and highly efficient and stably vibration is generated. |
