Patent ID: 6351056
Filing Date: 2002-02-26
Classification: H01L

Abstract:
A piezoelectric/electrostrictive device comprising a driving portion to be driven by displacement of a piezoelectric/electrostrictive element, a movable portion to be operated by displacement of said driving portion, a fixing portion for holding said driving portion and said movable portion, said movable portion being coupled with said fixing portion via said driving portion, and a hole formed by inner walls of said driving portion, an inner wall of said movable portion, and an inner wall of said fixing portion,said driving portion comprising a pair of mutually opposing thin plate portions, and a piezoelectric/electrostrictive element including a piezoelectric/electrostrictive operating portion comprising a pair or more of electrodes and a piezoelectric/electrostrictive layer arranged on at least a part of the outer surface of at least one of said thin plate portions, one end of said piezoelectric/electrostrictive operating portion in a direction in which said fixing portion is connected with said movable portion exists on said fixing portion or said movable portion, and the other end of said piezoelectric/electrostrictive operating portion is arranged on said thin plate portion, and at least one end of a piezoelectric/electrostrictive layer of said piezoelectric/electrostrictive element exists on said fixing portion or said movable portion, and the other end thereof is arranged on said thin plate portion, the Young's modulus Y1 of a material composing said thin plate portions and the Young's modulus Y2 of a material composing said piezoelectric/electrostrictive layer have a relationship satisfying the following expression: 11/Y2&lE;20.