Patent ID: 7631427

Claim:
A method of producing a pagewidth inkjet printhead, the method comprising: forming a substrate having defined therein a nozzle chamber operable to receive and store a fluid, the chamber fed at one side by an inlet passage; forming a nozzle plate in-situ on the substrate to define a nozzle opening on an opposite side of the nozzle chamber to the inlet passage; and forming a heater element between the nozzle opening and the inlet passage, the heater element arranged to be suspended within the nozzle chamber and to be in direct contact with the fluid in the nozzle chamber at both major faces thereof, the heater element being a cantilever supported at one end by the nozzle chamber, wherein the heater element is formed to require between substantially 120 nanojoules and substantially 400 nanojoules of heating energy to form said gas bubbles, the inlet passage, nozzle opening, and heater element are formed such that heat generated by the heater element is substantially dissipated by a flow of ink in through the inlet passage and out through the nozzle opening, and the nozzle plate is formed in-situ on the substrate with a thickness of substantially between 2 to 2.5 microns.