| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric element capable of preventing migration from a stress mitigation layer, and preventing the stress mitigation layer, where migration occurs, from being a starting point of breakage.SOLUTION: Piezoelectric layers 110 and internal electrodes 120, 125 are alternately laminated on a piezoelectric element, and the piezoelectric element is shrunk by applying voltage. The piezoelectric element is provided with a stress mitigation layer 140 having a layer surface parallel to a lamination layer, formed in contact with an outer periphery, provided one layer for each of the plural piezoelectric layers, and for mitigating a stress due to driving. One part of the stress mitigation layer 140 is contained in an active region obtained by projecting all internal electrodes 120, 125 in a lamination direction. Both of the immediately near internal electrode 120 even partially overlaid on one part of the stress mitigation layer 140 in the lamination direction, and the immediately near internal electrode 120 even partially overlaid on the other part in the lamination direction have the same polarity as that of the external electrode 150 contacting the stress mitigation layer 140. |
