Patent ID: 8269398

Claim:
A piezoelectric actuator comprising: a piezoelectric element adapted to simultaneously generate first and second vibration modes in response to a voltage applied thereto, the piezoelectric element has an element body having a plurality of laminated piezoelectric layers and having a pair of principal surfaces opposing each other in a laminating direction of the piezoelectric layers, and a plurality of electrode layers arranged in the element body and opposing each other in the laminating direction; and a frictional portion arranged on one of the principal surfaces of the element body and adapted to come into contact with a body to be driven and cause a frictional force therewith; wherein the frictional portion has a glass-containing portion containing a glass material and being formed such as to project from the one of the principal surfaces of the element body, and wherein the glass material contained in the glass-containing portion is dispersed in the element body.