Ink jet head and method of manufacturing the ink jet head

A method of manufacturing an ink jet head comprising a cavity unit and an actuator unit, the cavity unit comprising a plurality of nozzles and a plurality of pressure chambers, the actuator unit comprising a plurality of piezo electric elements, the cavity unit being joined with the actuator unit such that each piezoelectric element is located to face a corresponding pressure chamber, the method comprising:

• a step of defining a relation between an average nozzle diameter of a cavity unit and an average capacitance of an actuator unit;
• a step of measuring the average nozzle diameter of each of cavity units;
• a step of measuring the average capacitance of each of actuator units;
• a step of selecting a combination of one of the cavity units and one of the actuator units so that the average nozzle diameter of the selected cavity unit and the average capacitance of the selected actuator unit satisfy the relation defined in the defining step;
• and
• a step of joining together the selected cavity unit and the selected actuator unit,
• wherein there is no need to adjust voltage applied to the ink jet heads.