Patent ID: 7338570

Claim:
A method of producing an inkjet head, comprising: producing a flow path unit that includes a plurality of ink flow paths that reach ink jet nozzles through pressure chambers; producing an actuator unit that has a thermal expansion coefficient different from that of the flow path unit, includes a piezoelectric ceramic sheet having a size covering the chambers, and gives jetting energy to ink in the pressure chambers; laminating the flow path unit and the actuator unit to each other through a heat-curable adhesive agent; heating the flow path unit and the actuator unit to a predetermined temperature, which is equal to or larger than a curing temperature of the heat-curable adhesive agent; applying pressure on the flow path unit and the actuator unit in a direction of pressing the flow path unit and the actuator unit against each other through the heat-curable adhesive agent, only after the flow path unit and the actuator unit are thermally expanded to maximum sizes at the predetermined temperature and before the heat-curable adhesive agent is cured; and releasing the pressure applied on the flow path unit and the actuator unit after the heat-curable adhesive agent is cured, wherein the flow path unit and the actuator unit are heated at the predetermined temperature until the flow path unit and the actuator unit are thermally expanded to the maximum sizes determined by thermal expansion coefficients of the flow path unit and the actuator unit and the predetermined temperature.