Patent ID: 7678509
Filing Date: 2010-03-16
Classification: G03F

Abstract:
1. A method of manufacturing a phase shift mask having, on a transparent substrate, a main opening formed by partly removing a light-shielding film and an auxiliary opening provided at a peripheral portion of said main opening, said auxiliary opening having a width incapable of being resolved when transferring, wherein the transparent substrate is partly removed in a depth direction such that phases of light passing through the main opening and light passing through the auxiliary opening differ from each other by a predetermined angle, comprising: a first process including a second process including a step of forming a second resist film on the transparent substrate obtained in the first process, a step of exposing a pattern corresponding to one of the main opening and the auxiliary opening and then developing to form a second resist pattern, a step of, using the second resist pattern as a mask, etching part of the transparent substrate to a depth such that the phases of the light passing through the main opening and the light passing through the auxiliary opening differ from each other by the predetermined angle, and a step of stripping the remaining second resist pattern, and a third process including a step of removing a part of or whole of the etching mask layer.