Patent ID: 9735337
Date: 2017-08-15
CPC Classifications: H01L,H02N

Claim:
1. A piezoelectric actuator comprising a substantially rectangular parallelepiped piezoelectric element configured to generate first and second vibration modes simultaneously with each other in response to a voltage applied thereto, wherein the piezoelectric element has an active portion located between a plurality of inner electrodes arranged in the piezoelectric element and configured to be displaced in response to a voltage applied thereto, wherein one outer surface of the piezoelectric element includes a first region, and a second region located such as to project from the first region and to overlap a region corresponding to the active portion in the one outer surface, wherein the second region has a flat surface configured to come into contact with a body to be driven and generate a frictional force therewith, wherein the flat surface is shorter in a longitudinal direction of the piezoelectric element than in a lateral direction thereof, and wherein the flat surface is longer in the longitudinal direction of the piezoelectric element at a lateral center region thereof than at a lateral end region thereof.