Patent ID: 8662617

Claim:
A liquid ejection apparatus comprising: a passage unit including an ejection opening which ejects liquid, and a supply passage which supplies the liquid to the ejection opening; an piezoelectric actuator which includes a first electrode, a piezoelectric layer, and a second electrode arranged so that the first electrode and second electrode sandwich the piezoelectric layer therebetween, the piezoelectric actuator being configured so that, when a drive signal is applied between the first electrode and the second electrode, the piezoelectric layer is deformed and thereby energy is applied to the liquid in the supply passage; a drive signal generator which generates a drive signal having a voltage value corresponding to a reference voltage value; a driver which applies the drive signal generated by the drive signal generator between the first electrode and the second electrode; a voltage value changing unit which changes the reference voltage value; and an interval setting unit which determines a time interval to a change of the reference voltage value made by the voltage value changing unit; wherein: the voltage value changing unit changes the reference voltage value from a present voltage value to a larger voltage value, when an accumulated time during which a voltage is applied between the first electrode and the second electrode, the accumulated time being calculated since a last change of the reference voltage, reaches the time interval determined by the interval setting unit; and when the voltage value changing unit changes the reference voltage value, the interval setting unit determines another time interval which is shorter than before, based on the larger voltage value.