Patent ID: 7254976

Claim:
A method of manufacturing a liquid ejection head which ejects liquid droplets from nozzle orifices by generating pressure fluctuation in liquid contained in a plurality of pressure generating chambers communicated with the nozzle orifices, the method comprising: providing a metallic plate member; providing a first die, in which a plurality of projections are arrayed in a first direction with a fixed pitch, each of the projections being elongated in a second direction perpendicular to the first direction, the first die facing a first face of the plate member; providing a second die, opposed to the first die while facing a second face of the plate member; providing at least one dam member in at least one of the first die and the second die, so as to project from one of the first die and the second die toward the other one of the first die and the second die; positioning the first die and the second die, so that the at least one dam member is dug into at least one of the first face and the second face of the plate member; and further the first die and the second die, so that the projections are dug into a first region in the first face of the plate member, the projections being pressed in a third direction orthogonal to the first direction and the second direction, so as to generate a plastic flow of a material in the plate member into gaps defined between the projections, thereby forming partitioned recesses, wherein the at least one dam member is situated in the vicinity of at least one of ends in the first direction of the first region, thereby suppressing a plastic flow of the material in the first direction caused by positioning of the projections, and wherein the plate member includes at least one opening formed in at least one of the first face and the second face and configured to accept the dam member.