Patent ID: 8227153
Filing Date: 2012-07-24
Classification: G03F

Abstract:
1. A method of correcting light exposure used in pattern transfer, onto a target object for pattern transfer, of a mask pattern of a photomask under light exposure repeated multiple number of times to thereby form a transferred pattern, comprising the steps of: calculating, for each and every one of a plurality of shot regions having a transferred pattern formed by a single time of light exposure through a mask pattern and each and every one of a plurality of chip regions comprised in one of said shot regions, a numerical aperture of said mask pattern corresponding to said transferred pattern onto said target object based on an exposure layout of the plurality of shot regions while considering a first flare due to influence from the peripherals of said each shot region and a second flare due to influence from the peripherals of said each chip region; calculating an irradiation energy distribution of exposure light in said each shot region necessary for obtaining said transferred pattern of a predetermined dimension, using said calculated numerical aperture; and adjusting the irradiation energy distribution of the exposure light in said each shot region, based on said irradiation energy distribution calculated in the above; wherein said calculating said numerical aperture includes,