Patent ID: 7052806

Claim:
A production method of an exposure controlling photomask, the production method comprising: depositing a transparent material on a mask substrate to form a transparent material film as a transparent foundation material; depositing a resist on said transparent material film; continuously variably irradiating said resist with an electron beam by continuously varying an irradiating amount of the electron beam by varying at least one of intensity and douation while irradiating said resist to produce an exposure depth so as to define a three-dimensional face structure to be developed from the resist as a remainder wherein the remainder continuously varies between 100% and 0% of a thickness of the resist; performing development of the resist to produce the three-dimensional face structure according to said electron beam irradiating amount; etching-back said resist and the transparent material film so as to transfer the three-dimensional face structure of said resist to the transparent material film; and depositing a light interrupting film in a concavity of said three-dimensional face structure of said transparent material film such that a contour thickness of the light interrupting film varies inversely with a corresponding contour thickness of the transparent material film defined by the three-dimensional face structure.