| 摘要 |
A piezoelectric actuator includes a first piezoelectric layer, a second piezoelectric layer stacked on the first piezoelectric layer, a first electrode arranged on the first piezoelectric layer, a second electrode arranged between the first and second piezoelectric layers, and a third electrode arranged on the second piezoelectric layer. A portion of the third electrode faces the second electrode, and another portion of the third electrode faces the first electrode. The first electrode does not face at least a portion of the second electrode. A portion, of the second piezoelectric layer, sandwiched between the second electrode and the third electrode is polarized in a first direction in a thickness direction thereof, and portions, of the first and the second piezoelectric layers, which are sandwiched between the first electrode and the third electrode and between which the second electrode is not arranged, are polarized in a direction opposite to the first direction. |
