Patent ID: 7992971

Claim:
A liquid delivering apparatus, comprising: a flow-passage unit including an opening and a pressure chamber which accommodates liquid and which communicates with the opening; an oscillating plate which is stacked on the flow-passage unit, which partially defines the pressure chamber and which includes an extending portion that extends from one side edge of the flow-passage unit; a piezoelectric material layer which is stacked on one surface of the oscillating plate opposite to another surface of the oscillating plate where the flow-passage unit is stacked and which deforms upon application of an electric field thereto so as to oscillate the oscillating plate for delivering the liquid from the pressure chamber through the opening; and an electrode pattern and a drive circuit which apply the electric field to the piezoelectric material layer, wherein the oscillating plate is formed of an electrically conductive material, wherein the piezoelectric material layer is superposed on the oscillating plate at a region of the oscillating plate overlapping the flow-passage unit, wherein the liquid delivering apparatus further comprises an electrically insulating layer superposed on the oscillating plate at a region of the oscillating plate corresponding to the extending portion, wherein the drive circuit is mounted on the extending portion of the oscillating plate while the electrode pattern is superposed on both of the piezoelectric material layer and the electrically insulating layer at the region of the oscillating plate overlapping the flow-passage unit and the region of the oscillating plate corresponding to the extending portion, and wherein the liquid delivering apparatus is arranged such that the electric field is applied between the electrode pattern and the oscillating plate.