Patent ID: 7339310
Filing Date: 2008-03-04
Classification: F02M,H01L

Abstract:
1. A laminated piezoelectric element comprising: a laminated piezoelectric element comprising piezoelectric layers composed of a ceramic capable of expanding and contracting upon application of a voltage, and internal electrode layers that supply voltage to the piezoelectric layers, the internal electrode layers and piezoelectric layers being alternately provided; a first external electrode layer provided on a side of the laminated piezoelectric element and electrically connected with the internal electrode layers; and, a second external electrode layer provided on a side of the laminated piezoelectric element and electrically connected with the internal electrode layers via the first external electrode layer; wherein, when the maximum width of the laminated piezoelectric element in the direction perpendicular to the direction of lamination is taken to be W the laminated piezoelectric element has a piezoelectric active section that expands and contracts when a voltage is applied, and the second external electrode layer is provided continuously in the direction of lamination of the piezoelectric layers in the piezoelectric active section.