Patent ID: 11942305
Assignee: NUFLARE TECHNOLOGY, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A charged particle beam irradiation method, comprising:
generating a plurality of parametric elements by dividing, at positions of an extremum and an inflection point, a parametric curve that expresses a shape of a writing pattern and is defined by a plurality of control points arranged in order in a predetermined direction;
generating a polygon by extracting, for each of the parametric elements, one or some of the plurality of control points and connecting the extracted control points in order in the predetermined direction;
calculating a coverage by the polygon in each of a plurality of rectangular segmented regions obtained by dividing a target to be irradiated with a charged particle beam into a predetermined size;
calculating a coverage of each segmented region in a peripheral part of the writing pattern by finding intersections of each of the plurality of parametric elements and four sides of each of the plurality of segmented regions;
calculating an irradiation amount of each segmented region based on the calculated coverage; and
controlling a charged particle beam irradiation apparatus to irradiate the target with the charged particle beam at the calculated irradiation amount to write a pattern onto the target.