Patent ID: 7250113

Claim:
A method for manufacturing a liquid ejection head having a substrate including an ejection energy generating section for ejecting a liquid from an ejection opening, a driver element provided as a lower layer of the ejection energy generating section via an insulating layer for driving the ejection energy generating section, an electrode wiring section electrically connecting the driver element to the ejection energy generating section, formed of a material composed mainly of aluminum, a protective layer formed on the insulating layer to cover the ejection energy generating section, and a liquid supply port therethrough, comprising the steps of: forming a sacrificial layer at a position at which the liquid supply port is to be formed, by using the same material as that of the electrode wiring section, when the electrode wiring section is formed; forming an anti-etching layer for covering the sacrificial layer, the anti-etching layer having durability against an etching liquid; etching the substrate with the etching liquid from a surface thereof opposite to a surface of the substrate on which the ejection energy generating section is formed until the sacrificial layer is exposed; further proceeding with the etching to remove the sacrificial layer and expose a portion of the anti-etching layer to form the liquid supply port; and forming the liquid supply port in the substrate by removing the exposed anti-etching layer.