Patent ID: 6087048
Filing Date: 2000-07-11
Classification: G03F

Abstract:
A method of producing a block mask to be employed in an electron-beam lithography apparatus of a type that produces a unit pattern at a time by transmitting an electron beam through openings selected from among a plurality of kinds of openings of a block mask, links the unit pattern with a previous one, and repeats this process to delineate a desired pattern, said method of producing a block mask for electron-beam lithography apparatuses comprising:a step of applying a resist to the surface of a substrate of said block mask;a step of exposing said resist to delineate patterns of the plurality of kinds of openings;a step of developing said exposed resist; anda step of etching said substrate of said block mask,at said step of exposing said resist to delineate the patterns of said plurality of kinds of openings, when said resist must be exposed to delineate a pattern of openings that are larger than a predetermined size, the perimeters of corresponding opening portions of said resist are exposed by a predetermined width, but the insides thereof remain unexposed.