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

Claim 8:
9. A charged particle beam irradiation devices, comprising:
an irradiation device configured to irradiate a target with a charged particle beam; and
control circuitry configured to generate 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, generate 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, calculate 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, calculate 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, calculate an irradiation amount of each segmented region based on the coverage, and control the irradiation device to irradiate the target with the charged particle beam at the calculated irradiation amount to write a pattern onto the target.