Patent ID: 7592103

Claim:
A method of manufacturing a lithography mask having a mask pattern on a substrate, which mask pattern being formed by writing the mask pattern on a resist film with an electron beam writing method, said writing method comprising the steps of: dividing a writing pattern to be corrected by meshes for a foggy effect correction and meshes for a proximity effect correction, said meshes for proximity effect correction being finer than the meshes for foggy effect correction; obtaining an area occupation rate of the writing pattern for each of the meshes for the foggy effect correction and the meshes for the proximity effect correction; carrying out a first calculation which comprises calculating a stored energy, for each of the meshes for the foggy effect correction and the meshes for the proximity effect correction, on a condition of an exposure with a foggy effect and a proximity effect without correction and, based on the stored energy, obtaining an exposure dose for the meshes for a proximity effect correction, which exposure dose makes a dimension of the mask pattern coincide with a pattern for which an influence of the foggy effect and the proximity effect can be disregarded; carrying out a recalculation which comprises calculating the stored energy, based on the exposure dose obtained by the first calculation, on the condition of foggy effect and proximity effect, and, based on the stored energy, re-obtaining the exposure dose for the meshes for the proximity effect correction, which exposure dose makes a dimension of the mask pattern coincide with the pattern for which the influence of the foggy effect and the proximity effect can be disregarded; and repeating the recalculation, until a precision in the dimension falls within a predetermined range, to obtain a corrected exposure dose which corrects a dimensional error of the writing pattern caused by the proximity effect and the foggy effect.