Patent ID: 7249484
Filing Date: 2007-07-31
Classification: B41J,Y10T

Abstract:
1. 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 steps of: 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 to form at least one array of the projections, 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 supporting a second face of the plate member; forming at least one first region on the plate member so as to have a less rigidity than another region of the plate member; approaching the first die and the second die, so that the projections are dug into a second 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 to be the pressure generating chambers, wherein the at least one first region is adjacent to at least one of ends in the first direction of the second region, such that the first region and the second region are arranged in the second direction; wherein the projections in the first die is arranged so as to form two arrays of the projections; and wherein the first region is placed between two arrays of the projections when the projections are dug into the plate member.