Patent Document ID: 8276103
Application ID: 12883299
Patent Status: 1

Claim One:
1. A photomask designing method comprising: dividing design pattern data of a photomask into predetermined regions by a machine; obtaining a pattern perimeter for each of the divided regions by a machine; obtaining a pattern perimeter for an entire region of the design pattern data by repeating the obtaining a pattern perimeter for the each of the divided regions by a machine; obtaining a dimension conversion difference for the entire region of the design pattern data using the pattern perimeter for the entire region of the design pattern data and a correlation, which is obtained in advance, between a predicted pattern perimeter and a predicted dimension conversion difference by a machine; performing a process proximity correction on the design pattern data using a value of the obtained dimension conversion difference by a machine; and creating exposure pattern data from the design pattern data corrected by the process proximity correction by a machine.