Patent ID: 6248249
Filing Date: 2001-06-19
Classification: B41J,H04N

Abstract:
A method of manufacture of an ink jet printhead, said method comprising the steps of:(a) providing a semiconductor wafer having an electrical circuitry layer formed thereon;(b) etching a nozzle chamber cavity in the wafer and stopping the etching substantially at said epitaxial layer;(c) depositing a first layer of sacrificial material, filling the nozzle chamber cavity with the sacrificial material, and etching a series of concertina ridges in the sacrificial layer above the nozzle chamber cavity;(d) depositing a first inert material layer on the concertina ridges, and etching the first inert material layer to retain the series of concertina ridges on a surface of the first inert material layer;(e) depositing a first conductive material layer over the concertina ridges of the first inert material layer and etching the first conductive material layer to form a coil layer having a series of concertina wire portions over the nozzle chamber cavity;(f) depositing a second inert material layer on the first conductive material layer, and etching the second inert material layer to retain the series of concertina ridges on the surface thereof;(g) etching a back of the wafer to the epitaxial layer;(h) etching an ink ejection port through the epitaxial layer to be interconnected with the nozzle chamber cavity; and(i) etching away any remaining sacrificial layers.