Patent ID: 6649074
Filing Date: 2003-11-18
Classification: B41J

Abstract:
A method of manufacturing a bubble-jet type ink jet printhead, the method comprising the steps of:forming an insulating layer on the surface of a substrate; forming a round-shaped heater on the insulating layer; forming electrodes electrically connected with the round-shaped heater on the insulating layer; etching said insulating layer to form a opening for an ink chamber and an opening for a manifold, said opening for said ink chamber having a diameter less than that of said round-shaped heater and being located inside said round-shaped heater, said opening for said manifold being located outside said round-shaped heater; etching said substrate using said insulating layer having said openings as an etch mask to form an ink chamber having a diameter greater than that of the round-shaped heater wherein said ink chamber resulting in a concave shape, and said manifold; and depositing a protective layer over said insulating layer, said protective layer covering said opening for said manifold, said protective layer being perforated by a hole, said hole overlapping said opening in said insulating layer for said ink chamber producing a nozzle hole.