Patent ID: 8591010

Claim:
A liquid discharge head, comprising: a passage member comprising a plurality of liquid pressurizing chambers with an identical shape each other which have opening in a main surface and are arranged in a matrix shape, a plurality of liquid discharge holes respectively connected to the plurality of liquid pressurizing chambers, and a plurality of individual supply paths respectively connected to the plurality of liquid pressurizing chambers; and a piezoelectric actuator comprising a piezoelectric layer, a common electrode on the piezoelectric layer, a plurality of individual electrodes on the piezoelectric layer on an opposite side of the common electrode, and a diaphragm on which the common electrode, the piezoelectric layer, and the plurality of individual electrodes are laminated in that order wherein the piezoelectric actuator are laminated on the passage member in a state that the diaphragm and the piezoelectric layer cover the plurality of liquid pressurizing chambers, and wherein in a plan view of the liquid discharge head, an opening of each of the liquid pressurizing chambers is a polygonal shape with at least one acute angle shaped corner, each of the individual electrodes comprises an individual electrode body overlapped with the liquid pressurizing chamber, and a connection electrode led out from the individual electrode body to outside of the liquid pressurizing chamber, each of the liquid pressurizing chambers and each of the individual electrodes fit into a parallelogram shaped region which is made up of a first triangular region formed by two sides holding therebetween the acute angle shaped corner of the liquid pressurizing chamber and a straight line connecting two corners adjacent to the corner, and a second triangular region formed by half rotating the first triangular region within a planar surface.