Patent ID: 6796637
Filing Date: 2004-09-28
Classification: B41J,H04R,Y10T

Abstract:
A piezoelectric/electrostrictive film-type actuator comprising:a ceramic base; and a piezoelectric/electrostrictive element disposed on said ceramic base, said piezoelectric/electrostrictive element comprising a plurality of piezoelectric/electrostrictive films; and a plurality of electrode films; wherein said piezoelectric/electrostrictive films and said electrode films are alternately laminated such that said electrode films comprise an uppermost layer and a lowermost layer of said piezoelectric/electrostrictive element; wherein said piezoelectric/electrostrictive films comprise at least an upper piezoelectric/electrostrictive film and a lower piezoelectric/electrostrictive film, said upper piezoelectric/electrostrictive film is separated from said lower piezoelectric/electrostrictive film by an intermediate electrode film layer interposed therebetween, and said upper piezoelectric/electrostrictive film is thicker than said lower piezoelectric/electrostrictive film; wherein at least said lower piezoelectric/electrostrictive film includes pores, and an interface between an upper surface of said lower piezoelectric/electrostrictive film and a lower surface of said intermediate electrode is free from a different phase formed by a decomposed material of said piezoelectric/electrostrictive films; and wherein said actuator is driven in accordance with a dislocation of said piezoelectric/electrostrictive element.