Patent ID: 8353578

Claim:
A piezoelectric actuator disposed on a surface of a flow-path forming member of a liquid-droplet ejection head, the piezoelectric actuator applying energy to liquid in pressure chambers that are opened in the surface, the piezoelectric actuator comprising: a first piezoelectric layer disposed farthest from the surface of the flow-path forming member among one or more piezoelectric layers included in the piezoelectric actuator, the first piezoelectric layer having a first active portion that is displaced by an electric field acting in a thickness direction; a surface electrode configured to apply an electric field to the first active portion, the surface electrode being disposed on one surface of the first piezoelectric layer opposite the surface of the flow-path forming member; a land bonded to a terminal of a power supply member configured to supply a signal to the surface electrode, the land being disposed so as to be electrically connected to the surface electrode on the one surface of the first piezoelectric layer; and a continuous detection electrode including an outer peripheral portion extending along the outline of an area that opposes the land so as to surround the area, the detection electrode being disposed on one of the other surface of the first piezoelectric layer and a surface of a second piezoelectric layer underlying the first piezoelectric layer.