| 摘要 |
A piezoelectric ceramic actuator having a laminated body obtained by alternately laminating a plurality of piezoelectric ceramic layers and a plurality of internal electrode layers in which at least one part of two adjacent ceramic layers, having the internal electrode sandwiched therebetween, are bonded to each other through particles of ceramic powder contained within the internal electrode. As a result of this structure, the bonding strength between the ceramic layer and the internal electrode can be greatly increased compared with conventional designs, thus improving the impact resistance of the actuator. The average particle size of the ceramic powder contained within the internal electrode ranges from one-third to one times (preferably from one-half to one times) the thickness of the internal electrode, and the mixing ratio of the ceramic powder ranges from 10 to 20 weight percent to electroconductive materials within the internal electrode.
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