Patent ID: 7443077
Filing Date: 2008-10-28
Classification: B26F,H01L

Abstract:
1. A stacked-type piezoelectric device comprising a ceramic stacked body constituted by alternately stacking ceramic layers and internal electrode layers, and a pair of external electrodes respectively connected to a pair of bond surfaces formed on an outer peripheral surface of said ceramic stacked body, wherein said ceramic stacked body has a groove portion recessed into a groove shape in an outer peripheral surface of said ceramic stacked body, said groove portion being formed at least partially in a peripheral direction of said outer peripheral surface and being adjacent to a stacking surface of each of said internal electrode layers, wherein said internal electrode layer comprises an internal electrode portion having electric conductivity, and a recess portion formed by recessing inward an outer peripheral edge portion of said internal electrode portion from the outer peripheral surface of said ceramic stacked body and adjacent to said groove portion in the stacking direction, and wherein said internal electrode layer has a stay portion consisting of a ceramic material having substantially the same composition as that of said ceramic layer, said stay portion being formed by recessing an outer peripheral edge thereof from an outer peripheral surface of said ceramic stacked body on either one of said pair of bond surfaces, and said internal electrode layers of every other layers have said recess portion exposed on one bond surface of said pair of bond surfaces and have said stay portion on another bond surface, and said internal electrode layers of every other layers have said recess portion exposed on another bond surface of said pair of bond surfaces and have said stay portion on said one bond surface.