Patent ID: 6767674
Filing Date: 2004-07-27
Classification: G03F,Y10S

Abstract:
A method of fabricating a mask for patterning a semiconductor wafer with at least one feature having rounded edges, comprising the steps of:providing a mask blank suitable for patterning, said mask blank comprising a substrate and an opaque material formed thereon; patterning the opaque material with oval or rounded features; projecting an energy ream having an elliptical cross-sectional shape onto said mask blank, said elliptical cross-sectional shape defining a long axis and a short axis; positioning said long axis of said energy beam at a first angular position with respect to said mask blank and providing relative movement between said mask blank and said energy beam to form a first portion of said at least one feature; and positioning said long axis of said energy beam on said mask blank to a second angular position and providing relative motion movement between said mask blank and said energy beam to form a second portion of said at least one feature.