| 摘要 |
An ink jet printer is provided with an ink jet head. The ink jet head includes an ink passage body and an actuator. The ink passage body includes a nozzle, an ink chamber communicating with the nozzle, and a pressure chamber located between the nozzle and the ink chamber. The actuator includes a piezoelectric element facing the pressure chamber. The piezoelectric element includes 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 includes 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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