Patent ID: 9162455
Filing Date: 2015-10-20
Classification: B41J

Abstract:
1. A liquid ejecting apparatus comprising: a pressure generation chamber communicating with a nozzle opening for discharging a liquid: a piezoelectric element overlapping the pressure generation chamber and including a piezoelectric layer and a pair of electrodes, the piezoelectric layer made of a complex oxide having a perovskite structure, the piezoelectric layer having a polarization when a first voltage larger than a coercive voltage of the piezoelectric layer is applied to the piezoelectric layer, and the piezoelectric layer having a relaxed polarization when a second voltage having a reverse-polarity of the first voltage is applied to the piezoelectric layer; and a driver for supplying a driving waveform to drive the piezoelectric element, the driving waveform including a polarization stage in which the first voltage is applied so as to give the piezoelectric layer the polarization, a relaxation stage in which a voltage being applied is changed from the first voltage to the second voltage so as to relax the polarization to the relaxed polarization of the piezoelectric layer and expand the pressure generation chamber; and a voltage changing stage in which the voltage being applied is changed from the second voltage to a third voltage larger than the first voltage so as to shrink the pressure generation chamber, wherein the driving wave form further includes a first hold stage in which the third voltage is held for a predetermined time after the voltage changing stage, a first voltage changing stage in which the voltage being applied is changed from the third voltage to a fourth voltage smaller than the first voltage after the first hold stage, second hold stage in which the fourth voltage is held for a predetermined time after the first voltage changing stage, and a second voltage changing stage in which the voltage being applied is changed from the fourth voltage to the first voltage.