Patent ID: 8227151

Claim:
A flare correction method comprising: acquiring a flare point spread function indicating a relationship between an intensity of flare light convolved into exposing light that has passed through a pattern formed on a mask and a projection optical system, and a distance from the pattern; calculating a pattern density distribution in a first region of the mask, the distance from the pattern being equal to or shorter than a predetermined value in the first region; calculating pattern coverage in a second region of the mask, the distance from the pattern being longer than the predetermined value; calculating a first flare distribution with respect to the pattern by performing convolution integration between the flare point spread function corresponding to the first region and the pattern density distribution in the first region; calculating a flare value corresponding to the second region by multiplying a value of integral of the flare point spread function corresponding to the second region by the pattern coverage; calculating a second flare distribution by adding the flare value to the first flare distribution; and correcting the pattern based on the second flare distribution.