Patent ID: 7102275
Filing Date: 2006-09-05
Classification: H01L

Abstract:
1. A stack-type piezoelectric device comprising an alternate stack of first piezoelectric layers and second piezoelectric layers, wherein a plurality of individual electrodes electrically independent of each other are formed in each of the first piezoelectric layers, wherein a common electrode adapted for application of a voltage between the common electrode and the individual electrodes is formed in each of the second piezoelectric layers, wherein a relay electrode is formed in each of the first piezoelectric layers, wherein the length of the relay electrode is aligned generally perpendicular to the length of the individual electrodes, and wherein the common electrodes adjacent in a thickness direction of the first and second piezoelectric layers are electrically connected through the relay electrode by electroconductive members in a plurality of through holes formed in the first piezoelectric layers and along the extending direction of the relay electrode and by electroconductive members in a plurality of through holes formed in the second piezoelectric layers and along the extending direction of the relay electrode.