Ink jet printing head

An ink jet printing head comprising:

• a plurality of piezoelectric actuators arranged in rows, aligned substantially along a line, on a substrate, each row including first piezoelectric elements and second piezoelectric elements which are alternately arrayed along the row, the first piezoelectric elements being actuatable to apply a compressive force on ink in accordance with print signals, the second piezoelectric elements being fixed and not actuated;
• said first and second piezoelectric elements having substantially the same width in the direction of said rows, and said first and second piezoelectric elements having a multilayer structure including laminated layers;
• and
• an ink chamber unit, arranged on said actuators, which includes ink chambers located above the respective first piezoelectric elements, wherein the respective ink chambers contain ink,
• said ink chamber unit comprising:
• an oscillation plate including diaphragm portions which are connected to the respective first piezoelectric elements thereby forming connections between said diaphragm portions and said first piezoelectric elements and said diaphragm portions being independently deformable in a vertical direction perpendicular to the substrate by said first piezoelectric elements when actuated;
• a nozzle plate which includes nozzles located above the respective diaphragm portions and opened to the ink chambers, so that ink drops are respectively forced out from the nozzles when the first piezoelectric elements are actuated, wherein said nozzles are provided separately from said oscillation plate;
• and
• an ink passage member, arranged between said oscillation plate and said nozzle plate, which includes ink passages communicating with the respective ink chambers, said ink passages having a shape corresponding to a shape of said diaphragm portions.