Patent ID: 6949320

Claim:
A preparation method of an exposure original plate, comprising: subdividing a pattern constituting an exposure original plate into a plurality of rectangular patterns; extracting at least one micro pattern having a side with a size smaller than a prescribed value from among the plurality of rectangular patterns; forming a corrected micro pattern for the extracted micro pattern in which a size of a side of the extracted micro pattern perpendicular to another side of the extracted micro pattern making contact with an adjacent pattern is increased by at least the prescribed value; correcting the adjacent pattern, to form a corrected adjacent pattern, by retreating the side of the adjacent pattern which has been in contact with said corrected micro pattern by said prescribed amount of increase; finding Electron Beam (EB) exposure data for a pattern including said corrected micro pattern and said corrected adjacent pattern, and carrying out EB exposure by the variable shaped exposure system based on the EB exposure data.