Patent ID: 7512035
Filing Date: 2009-03-31
Classification: B41J

Abstract:
1. A piezoelectric actuator for a liquid transporting apparatus, which is arranged on one surface of a channel unit in which a liquid channel including a plurality of pressure chambers arranged along a plane is formed, and which selectively changes volume of the pressure chambers, the piezoelectric actuator comprising: a vibrating plate which covers the pressure chambers; a common electrode which is formed on a surface of the vibration plate on a side opposite to the pressure chambers; a piezoelectric layer which is arranged continuously on a surface of the common electrode on a side opposite to the pressure chambers, so that the piezoelectric layer wholly covers the pressure chambers thereover; an insulating layer which is formed entirely on a surface of the piezoelectric layer on a side opposite to the pressure chambers; wirings which are formed, on a surface of the insulating layer on a side opposite to the pressure chambers, corresponding to the pressure chambers respectively; a drive unit connected to the wirings, and arranged on the surface of the insulating layer on the side opposite to the pressure chambers, wherein: a first through hole is formed in the insulating layer at an area facing one of the wirings; the insulating layer and the piezoelectric layer are adhered tightly without a gap between the insulating layer and the piezoelectric layer; and the first through hole is filled with an electroconductive material which is connected to one of the wirings.