Patent ID: 7375356

Claim:
An electron-beam exposure system comprising: density-per-area map generating means configured to divide a certain area on which an electron beam is irradiated into meshes, to figure out a ratio of an area of patterns to be irradiated on each divided region to an area of the divided region, thus to generate a density-per-area map; and proximity-effect correcting means configured to correct exposure of the electron beam by referring to the density-per-area map, wherein the proximity-effect correcting means includes product-sum arithmetic means which is configured to perform product-sum arithmetic on two-dimensional array data, and addition means which is configured to perform addition arithmetic on the two-dimensional array data, the proximity-effect correcting means stores, in a first memory, two-dimensional array data on a density per area of patterns included in each of the meshes, performs the product-sum arithmetic and the addition a predetermined number of times, and thus calculates the two-dimensional array data on the density per area by a linear conversion, subsequently storing, in a second memory, the resultant data as two-dimensional array data of data on exposure to be used for correcting a proximity effect.