Patent ID: 7475969

Claim:
An ink-jet printing head comprising an integral body which comprises a piezoelectric actuator and a cavity plate, the piezoelectric actuator of the integral body including a plurality of piezoelectric sheets and a plurality of electrodes each of which is formed so as to be interposed between adjacent two of the plurality of piezoelectric sheets, portions of the plurality of piezoelectric sheets which are sandwiched by the electrodes functioning as a plurality of active portions, the cavity plate of the integral body including a plurality of pressure chambers which are formed through the thickness thereof and which respectively correspond to the plurality of active portions, the cavity plate being stacked on and bonded to the piezoelectric actuator at one of opposite surfaces thereof, wherein the piezoelectric actuator further includes at least one detect portion which can be perceived from an outside of the piezoelectric actuator and the cavity plate further includes at least one opening which is formed through a thickness thereof, and the piezoelectric actuator and the cavity plate are stacked on and bonded to each other to provide the integral body, such that the entirety of each of the at least one detect portion is located within each of the at least one opening as viewed from a cavity-plate side in a direction of stacking of the piezoelectric actuator and the cavity plate.