Patent ID: 8575821
Filing Date: 2013-11-05
Classification: G02B,H02N

Abstract:
1. A piezoelectric actuator comprising: a column-like piezoelectric body, whose bottom face is fixed to a base portion, and which stands from said base portion; and a driving power supply section for applying a driving voltage to said piezoelectric body; so as to move a movable body by using mechanical vibration generated on a top face of said piezoelectric body, wherein, said piezoelectric body includes two sets of a pair of electrodes for applying electrical fields to said piezoelectric body; said two sets of a pair of electrodes are formed in such a manner that each of said two sets is provided to each of two regions into which said piezoelectric body is divided by a plane parallel to the center axis of said piezoelectric body; and said driving power supply section is configured so as to apply a driving voltage having a frequency between the second-order bending resonant frequency of said piezoelectric body and the first-order expansion-contraction resonant frequency of said piezoelectric body to either one of said two sets of a pair of electrodes, selectively.