Patent ID: 7322104

Claim:
A method for producing an ink jet head, the ink jet head comprising a plurality of discharge ports for discharging ink, a plurality of ink flow paths for respectively supplying ink to the plurality of discharge ports, and an ink supply port for supplying ink to the plurality of ink flow paths, the ink jet head discharging ink supplied from the ink supply port through the plurality of discharge ports using a plurality of energy generating elements, the method comprising the steps of: providing a substrate having a first principal plane on which the plurality of energy generating elements, a dummy layer for forming the ink supply port, and a first etching stopper layer suffounded by the dummy layer are formed; forming a second etching stopper layer on a region of the first principal plane corresponding to the ink supply port; forming, on the first principal plane, a flow path construction member for constructing the plurality of discharge ports and the plurality of ink flow paths; placing, on a second principal plane opposed to the first principle plane of the substrate, an etching mask for forming a plurality of through holes, the etching mask being partitioned so as to include a region opposed to the first etching stopper layer; performing etching of the substrate from the second principle plane; and removing the second etching stopper layer after the etching step to form the ink supply port, wherein, in the etching step, a groove is formed on the first principal plane, the groove having a region corresponding to the first etching stopper layer corresponding to the dummy layer left in an island-shaped manner, and the groove communicating with a plurality of through holes formed on the second principal plane.