| 摘要 |
Disclosed is a method for driving a liquid-jet head comprising a passage-forming substrate in which pressure generating chambers communicating with nozzle orifices are formed; and a piezoelectric element provided on one surface of the passage-forming substrate via a vibration plate, and consisting of a lower electrode, a piezoelectric layer, and an upper electrode. The piezoelectric layer consists of a relaxor ferroelectric. A voltage between a potential V1, at which the capacitance of the piezoelectric element is maximal in a capacitance-potential curve of the piezoelectric element, and a potential V2, which has a larger absolute value than the absolute value of the potential V1 and at which an inflection point in the capacitance-potential curve is reached, is set as a drive start potential V0. The piezoelectric element is driven using a drive waveform having an ejection step for changing the potential from the drive start potential V0 to a potential V3, at which a driving electric field having an electric field strength of 100 to 500 kV/cm is generated in the piezoelectric layer, to contract the pressure generating chamber, thereby ejecting liquid droplets through the nozzle orifice.
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