Patent ID: 8994247
Filing Date: 2015-03-31
Classification: B06B,H01L,H04M,H04R

Abstract:
1. A piezoelectric actuator, comprising: a stacked body having a longitudinal direction and a width direction, the stacked body composed of internal electrodes and piezoelectric layers which are stacked on each other; and a surface electrode disposed on at least one of main surfaces orthogonal to a stacking direction of the stacked body so as to be electrically connected to the internal electrodes, the internal electrodes each including a first electrode and a second electrode, the stacked body comprising an active section in which the first electrodes and the second electrodes of the internal electrodes are arranged so as to overlap each other in a stacking direction thereof, and an inactive section which is every section of the stacked body other than the active section, an internal electrode placed on a one-main-surface side of the internal electrodes being configured so that its end part situated near a boundary between the active section and the inactive section is curved toward the other main surface, the surface electrode being disposed to extend from the active section to the inactive section in the longitudinal direction and the width direction, the surface electrode being curved in conformity to the curve of the internal electrode in the width direction.