Patent ID: 8083331
Filing Date: 2011-12-27
Classification: B41J,H01L,Y10T

Abstract:
1. A piezoelectric actuator comprising: an uppermost piezoelectric layer comprising a plurality of surface individual electrodes provided on a front surface in a row that extends along a first direction, and the uppermost piezoelectric layer being connectable to a wiring member comprising a plurality of drive side terminal electrodes such that the surface individual electrodes are respectively connected to the drive side terminal electrodes; a plurality of piezoelectric layers that are laminated and provided on a rear surface side of the uppermost piezoelectric layer; and a plurality of internal electrodes disposed between the piezoelectric layers; wherein each of the surface individual electrodes has a slender shape of which a longitudinal direction extends along a second direction perpendicular to the first direction; wherein a plurality of surface layer through holes are formed in the uppermost piezoelectric layer such that the surface individual electrodes are connected to the internal electrodes via the surface layer through holes; wherein an electrode terminal, which is smaller than a dimension of the respective surface individual electrodes in the longitudinal direction of the respective surface individual electrodes, is formed on each of the surface individual electrodes; wherein the plurality of electrode terminals are disposed so as to be staggered along the first direction, and are connectable to the respective drive side terminal electrodes through a thermo-fusing conductive bonding material; wherein the surface layer through holes are disposed substantially in a row that extends along the first direction; and wherein at least one of the plurality of surface individual electrodes has a thickened portion extending from the electrode terminal towards the surface layer through hole.