Patent ID: 9024513
Filing Date: 2015-05-05
Classification: F02M,H01L

Abstract:
1. A multi-layer piezoelectric element, comprising: a stacked body including piezoelectric layers and internal electrode layers, the piezoelectric layers and the internal electrode layers being stacked; an external electrode layer attached to a side surface of the stacked body, the external electrode layer being elongated in a stacking direction of the stacked body, the external electrode layer being electrically connected with ends of the internal electrode layers which are exposed on the side surface; and an external electrode plate bonded to the external electrode layer therealong by an electrically conducting bonding material, wherein the external electrode plate is provided with a plurality of slits which extend from opposite long sides of the external electrode plate toward a center thereof in such a manner that tips of the respective slits overlap each other alternately when viewed in the stacking direction of the stacked body, and a portion of the external electrode plate where the tips of the respective slits overlap each other alternately is provided with a hole extending along an extension direction of the slit.