Patent ID: 7721440

Claim:
A method for manufacturing an inkjet head including a lower structure and an upper structure, the lower structure having a pressure chamber that stores ink and a nozzle that is provided at the pressure chamber and ejects the ink, and the upper structure having an actuator that changes an internal pressure of the pressure chamber to eject the ink in the pressure chamber through the nozzle, the method comprising the steps of: laminating a first separation film on a substrate; laminating a second separation film directly on the first separation film; forming the upper structure having the actuator on the second separation film by using one of a liquid phase method and a vapor phase method; forming grooves in the upper structure that extend from an upper surface of the upper structure to an interface between the first separation film and the second separation film; contacting a separation liquid with the interface between the first separation film and the second separation film to separate the first separation film from the second separation film at the interface, the separation liquid contacting the interface at a region that is exposed by formation of the grooves, the contacting of the separation liquid at the interface thereby separating the upper structure from the substrate including the first separation film; forming the lower structure having the pressure chamber, independently of the substrate; and joining the upper structure and the lower structure together.