Patent ID: 7358653
Filing Date: 2008-04-15
Classification: H01L

Abstract:
1. A piezoelectric element, comprising: a piezoelectric substrate including a top surface, a bottom surface, and at least one side face connecting the top surface and the bottom surface, and comprising a plurality of internal electrodes comprising at least one first and at least one second internal electrodes adapted to be place at different electric potentials, the internal electrodes disposed parallel to the top surface and the bottom surface and exposed at the side face in the piezoelectric substrate, a plurality of piezoelectric layers stacked with the plurality of internal electrodes such that each internal electrode is interposed between a pair of piezoelectric layers, and wherein the piezoelectric element further comprises an exterior portion for preventing migration, the exterior portion covering portions of the first internal electrodes and the second internal electrodes exposed on a side face of the piezoelectric substrate, the exposed portions not including a portion which can be electrically connected to the first external and the second external electrodes, the exterior portion containing dispersed electroconductive particles.