Patent ID: 8872141

Claim:
A charged particle beam writing apparatus comprising: a first block generation unit configured to generate a plurality of area processing blocks in a writing region in which a plurality of writing groups respectively using different one of base doses set in advance, where a plurality of figure patterns are arranged in each of regions of the plurality of writing groups, is to be written; a second block generation unit configured to generate a plurality of proximity effect correction processing blocks for proximity effect correction, in the each of the regions of the plurality of writing groups; an area density calculation unit configured to calculate an area density of a figure pattern arranged in each of the plurality of area processing blocks; a weighting calculation unit configured to perform a weighting calculation on the area density for each of the plurality of area processing blocks by using a base dose of a corresponding group in the plurality of writing groups; a proximity effect correction dose coefficient calculation unit configured to calculate a proximity effect correction dose coefficient for proximity effect correction, for each of the plurality of proximity effect correction processing blocks, by using a corresponding weighted area density; a dose calculation unit configured to calculate a dose of a charged particle beam by using the base dose of the each of the plurality of writing groups and the proximity effect correction dose coefficient, calculated using the corresponding weighted area density weighted by the base dose, of the each of the plurality of proximity effect correction processing blocks; and a writing unit configured to write a figure pattern concerned in the plurality of figure patterns on a target object with a charged particle beam, based on the dose calculated, for the each of the regions of the plurality of writing groups.