Patent ID: 7479729

Claim:
A piezoelectric actuator comprising: a piezoelectric layer; a vibration plate provided on one side of the piezoelectric layer; a plurality of individual electrodes interposed between the piezoelectric layer and the vibration plate; a common electrode provided on the other surface of the piezoelectric layer and common to the individual electrodes; a plurality of first terminals formed on a same plane as the individual electrodes and each associated with one of the individual electrodes; a plurality of first wirings formed on the same plane as the individual electrodes and each electrically connecting one of the individual electrodes and one of the first terminals; and a drive unit which supplies drive voltage selectively to the individual electrodes is provided on the surface of the vibration plate, the drive unit having a plurality of output terminals joined to the individual electrodes via the first terminals and the first wirings, wherein the vibration plate is deformed by the deformation of the piezoelectric layer.