| 摘要 |
PURPOSE:To form a constitution, in which an internal electrode layer after assembly is not peeled, by organizing the internal electrode layer of a metallic material mainly comprising palladium (Pd) and/or platinum (Pt) and shaping a plurality of holes penetrating in the laminating direction. CONSTITUTION:A material constructing an internal electrode with a plurality of specific holes is composed of a material mainly comprising Pd and/or Pt, powdered together with Ag, Ni, etc., mixed with a binder and changed into a pasty state, and baked at a fixed temperature after application. Since a pasty electrode material is baked uniformly extending over the upper section of a piezoelectric ceramic board 1 normally, the material does not lose its original electrical characteristics, and a plurality of small holes 6 penetrating in the laminating direction of the internal electrode can be shaped. Common materials 7 connecting each piezoelectric ceramic board 1 consisting of the same material are disposed into the holes of the internal electrode layers 2, thus firmly fixing respective piezoelectric ceramic board 1 mutually, then positively preventing peeling due to transversal effect strain on the polarization of an actuator.
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