Patent ID: 8103980

Claim:
A writing method comprising: specifying a matrix of rows and columns of regions as divided from a surface area of a target object to include first, second and third regions, the third regions being less in size than the first and second regions; determining first corrected doses of a charged particle beam for correcting fogging effects in the first regions; determining corrected size values for correcting pattern line width deviations occurring due to loading effects in the second regions; using said corrected size values in said second regions to create a map of base doses of the beam in respective ones of said second regions; using said corrected size values to prepare a map of proximity effect correction coefficients in respective ones of said second regions; using the maps to determine second corrected doses of said beam for correction of proximity effects in said third regions; using the first and second corrected doses to determine an actual beam dose at each position on the surface of said object; and controlling said beam in accordance with said actual beam dose to thereby write a pattern on said object.