| 摘要 |
An ink jet printer is provided with an ink jet head. The ink jet head comprises an ink passage body and an actuator. The ink passage body comprises a nozzle, an ink chamber communicating with the nozzle, and a pressure chamber located between the nozzle and the ink chamber. The actuator comprises a piezoelectric element facing the pressure chamber. The piezoelectric element comprises a piezoelectric layer, a first electrode connected with a front face of the piezoelectric layer, a second electrode connected with a back face of the piezoelectric layer, and a first insulator located between the second electrode and the ink passage body. The ink jet printer further comprises a device for maintaining the electric potentials of the ink passage body and the second electrode such that the electric potential of the ink passage body is equal to or below the electric potential of the second electrode.
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