Patent ID: 7279259
Filing Date: 2007-10-09
Classification: G03F

Abstract:
1. A pattern data correcting method for making a correction to pattern data affected by a proximity effect when a pattern is formed on a photomask or wafer according to design data for a semiconductor device, comprising the steps of: detecting, according to said design data, a space portion on said photomask or wafer and having a specified size occurring between first and second patterns facing each other; producing pattern data corresponding to an assist pattern that fills said space portion; detecting, on a third pattern near to said assist pattern, an edge to be corrected in a position out of framing portions of said third pattern and opposite to and parallel with an edge of said assist pattern, said edge of said assist pattern extending in a direction between said first and second patterns facing each other; making a correction to the detected edge, said correction being independent of a correction made to an other edge of said third pattern; and removing said assist pattern.