Patent ID: 9484185
Filing Date: 2016-11-01
CPC Classification: H01J

Claim Text:
1. A charged particle beam writing apparatus comprising: a dividing-into-shots processing circuitry configured to divide a figure pattern into a plurality of shot figures each having a size that can be irradiated by one shot of a charged particle beam; a proximity effect density calculation processing circuitry configured to calculate a proximity effect density by using the figure pattern before being divided into the plurality of shot figures; a correction term calculation processing circuitry configured to calculate a correction term which corrects an error of the proximity effect density of the figure pattern to be written, compared against the figure pattern at design stage; a proximity effect correction dose coefficient calculation processing circuitry configured to calculate a proximity effect correction dose coefficient for correcting a proximity effect, by using the correction term; a dose calculation processing circuitry configured to calculate a dose of the charged particle beam by using the proximity effect correction dose coefficient; and a writing mechanism, including a charged particle source, a deflector and a stage on which a target object is placed, configured to write the figure pattern on the target object by using the charged particle beam whose dose is the dose calculated.