Patent ID: 6828573
Filing Date: 2004-12-07
Classification: H01J

Abstract:
An electron beam lithography system comprising:an exposure map creating unit which, based on positional relations between meshes dividing a region to be rendered by an electron beam on the one hand and shots to be rendered by said electron beam on the other hand, creates an exposure map by calculating an area density from a shot area included in each of said meshes; and a proximity effect correcting unit that corrects a level of exposure for each of said shots by referencing said exposure map so that each shot is exposed at the corrected level; wherein said proximity effect correcting unit includes: a judging unit that judges whether or not each shot straddles a plurality of meshes based on positional relations between coordinates of two diagonally positioned edge points of each shot on the one hand and mesh boundaries on the other hand; a plurality of area value computing units that compute an area of a respective shot in each of the meshes; a plurality of adding circuits; and a plurality of memories that store said computed area values of shots included in each respective mesh, wherein said adding circuits add newly computed area values in respective memories to previously computed area values for each respective mesh.