Patent ID: 8791432
Filing Date: 2014-07-29
Classification: B82Y,H01J

Abstract:
1. A beam writing apparatus comprising: a memory configured to store a plurality of dose equations for calculating a dose of a beam; a selection unit configured to select a dose equation from the plurality of dose equations stored in the memory, for each small region of a plurality of small regions made by virtually dividing a writing region of a target workpiece into mesh-like regions; a dose calculation unit configured to calculate a dose of a beam which is shot into a small region of the plurality of small regions, by using a selected dose equation, for the each small region; and a writing unit configured to write a desired pattern in the small region, by using a calculated dose, for the each small region, wherein the selection unit selectively selects (1) one of the dose equations in a case that a pattern area density of the small region is 100% and each of pattern area densities of all of a plurality of small regions which adjacently surround the small region is 100%, and (2) another one of the dose equations in a case that a pattern area density of the small region is 100% and at least one of pattern area densities of the plurality of small regions which adjacently surround the small region is not 100%.