| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric actuator which performs thickness slip mode transformation in circumferential direction. SOLUTION: A piezoelectric actuator 1 is equipped with a piezoelectric element main body 2 circular in plan view and a top electrode 3 and a bottom electrode 4 installed at the upper end and the lower end, respectively, in the thickness direction of that piezoelectric element main body. Though the piezoelectric actuator 1 is in the shape of a hollow tube, this is on account of letting it perform the thickness slippage mode transformation in circumferential direction easily, and it is not limited to the shape of a hollow tube so long as it is circular in plan view. The piezoelectric element main body 2 is polarized in circumferential direction, accordingly when voltage is applied between the top electrode 3 and the bottom electrode 4, the piezoelectric element main body 2 performs thickness slip transformation in circumferential direction. |
