| 摘要 |
A piezoelectric actuator includes a vibration plate, a first piezoelectric layer formed on one surface of the vibration plate, a second piezoelectric layer stacked on a surface of the first piezoelectric layer, a plurality of individual electrodes arranged on a surface of the second piezoelectric layer in a predetermined direction, a first common electrode having a plurality of first electrodes formed between the first piezoelectric layer and the second piezoelectric layer, and which are arranged in the predetermined direction to face the individual electrodes respectively, and a first wire electrically connecting all of the first electrodes, and a second common electrode having a plurality of second electrodes formed between the vibration plate and the first piezoelectric layer, and which are arranged in the predetermined direction to face the individual electrodes respectively, and a second wire electrically connecting all of the second electrodes.
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