Patent ID: 7408289
Filing Date: 2008-08-05
Classification: H02N

Abstract:
1. A piezoelectric actuator comprising: a moving member having a predetermined length; and a piezoelectric portion contacting the moving member, the piezoelectric portion comprising: a piezoelectric layer comprising a plurality of regions; a first electrode layer divided into the same number of regions as the piezoelectric layer, disposed on a first side the piezoelectric layer, and applying electrical signals to the regions of the piezoelectric layer; a second electrode layer divided into the same number of regions as the piezoelectric layer, disposed on a second side of the piezoelectric layer that is opposite the first side, and applying electrical signals to the regions of the piezoelectric layer; and a metal layer transmitting the vibration of the piezoelectric layer to the moving member; wherein the piezoelectric layer generates a contraction vibration or an expanding vibration in response to an electrical signal to move the moving member linearly in response to the contraction vibration or the expanding vibration.