Patent ID: 9525120
Filing Date: 2016-12-20
CPC Classification: B05B,F02M,H01L

Claim Text:
1. A multi-layer piezoelectric element, comprising: a stacked body in which piezoelectric layers and internal electrode layers are laminated; and an external electrode adhered to a side surface of the stacked body with a conductive bonding material and electrically connected to the internal electrode layers, wherein the external electrode includes at least one of a plurality of slits alternately extending from opposite ends of the external electrode in a width direction thereof toward a central part of the external electrode and a plurality of holes extending in the width direction of the external electrode, and protrusions which protrude toward the stacked body are disposed in peripheral edges of the slits or the holes, and a conductive layer electrically connected to the internal electrode layers is provided on a side surface of the stacked body, and each of the protrusions penetrates into the conductive layer and electrically connects the conductive layer.