Patent ID: 7275308

Claim:
A method for manufacturing a monolithic ink-jet printhead, comprising: preparing a silicon substrate; forming a first silicon oxide layer by oxidizing the surface of the substrate; forming, on the substrate, a MOS integrated circuit including a MOSFET for driving the heater and electrodes connected to the heater; forming a heater on a second silicon oxide layer; forming, inside the heater, a nozzle for ejecting ink by etching a hole in the second silicon oxide layer, the hole having a diameter smaller than an innermost diameter of the heater; forming a manifold for supplying ink by etching a bottom surface of the substrate; forming an ink chamber having a diameter larger than that of the heater and having a hemispheric shape by etching the substrate exposed by the nozzle; and forming an ink channel for connecting the ink chamber to the manifold by etching the bottom of the ink chamber through the nozzle.