Stack-type piezoelectric device

Abstract

Provided is a stack-type piezoelectric device capable of preventing cracks from being made in a portion between adjacent individual electrodes and a relay common electrode in a piezoelectric layer with individual electrodes formed therein, because of a polarization process or the like. In a stack-type piezoelectric device 1, each piezoelectric layer 3 with individual electrodes 2 formed therein also has relay common electrodes 6 formed so as to be electrically connected to each of common electrodes 4, 4 adjacent in a stack direction. For this reason, for example, where a voltage is applied between individual electrodes 2 and common electrodes 4 to effect a polarization process, electric fields are generated not only in the thickness direction of the piezoelectric layer 3, but also between adjacent individual electrodes 2 and relay common electrode 6. At this time, since an end 2b of each individual electrode 2 adjacent to the relay common electrode 6 has a semicircular contour on the relay common electrode 6 side, it is feasible to prevent cracks from being made in a portion between adjacent individual electrodes 2 and relay common electrode 6 in the piezoelectric layer 3.

Dependencies are inferred from the claim text.