Patent ID: 8702197
Filing Date: 2014-04-22
Classification: B41J,H01L

Abstract:
1. A piezoelectric actuator comprising: a first electrode which is formed on a base surface of a vibration plate; a piezoelectric layer which is formed on the base surface of the vibration plate and the first electrode; and a second electrode which is formed on the piezoelectric layer so as to extend in an X-axis direction, wherein the second electrode has a first portion having a first width, a second portion having a second width which is smaller than the first width, and a third portion which connects the first portion and the second portion, wherein a third width of the third portion narrows from the first portion toward the second portion, wherein the widths are measured in a Y-axis direction transverse to the X-axis direction, wherein the first electrode has a first side which forms an outer edge of the first electrode on a plan view when seen from a Z-axis direction of the base surface and which extends in the Y-axis direction, wherein the Z-axis direction is transverse to the X-axis direction and the Y-axis direction, and wherein the third portion of the second electrode is disposed immediately above the first side of the first electrode in the Z-axis direction, with no offset in the X-axis direction or the Y-axis direction.