Patent ID: 7874655

Claim:
A liquid transporting apparatus which transports a liquid, comprising: a channel unit in which liquid transporting channel transporting the liquid is formed, the liquid transporting channel including a pressure chamber; a piezoelectric actuator which is connected to the channel unit, and which applies a pressure to the liquid in the pressure chamber, the piezoelectric actuator having: a piezoelectric layer; a first electrode which is arranged on a first surface of the piezoelectric layer to face the pressure chamber; a second electrode which is arranged, to face the first electrode, on a second surface of the piezoelectric layer different from the first surface; third electrodes which are arranged on the piezoelectric layer to sandwich the first electrode in a plan view; and fourth electrodes which are arranged, to face the third electrode, on the piezoelectric layer; a voltage applying mechanism which applies a voltage to the piezoelectric actuator; and a controller which controls the voltage applying mechanism, wherein the channel unit is formed of a material having a coefficient of linear expansion greater than a coefficient of linear expansion of the piezoelectric layer, and the voltage applying mechanism applies the voltage between the first electrode and the second electrode, and between the third electrodes and the fourth electrodes, and the controller controls the voltage applying mechanism so that the voltage applied between the first electrode and the second electrode is changed, and to thereby deform a portion of the piezoelectric layer facing the pressure chamber and to carry out a pressure applying operation to apply a pressure to the liquid in the pressure chamber and that a predetermined constant voltage is applied between the third electrodes and the fourth electrodes during the pressure applying operation.