Patent ID: 6258511
Filing Date: 2001-07-10
Classification: G03F,H01J,Y10S

Abstract:
A charged particle beam exposure method, comprising following steps:providing a charged particle beam exposure device including an illumination optical system to illuminate a mask with an illumination charged particle beam, and a projection optical system to project said charged particle beam passing through a mask onto a sensitive substrate;dividing a pattern to be transferred to an exposure surface of said sensitive substrate into a plurality of subfields;classifying said plurality of subfields into a plurality of stripes;arranging said plurality of stripes on said mask;exposing a stripe positioned in a field of said projection optical system with an exposure time amount;upon completion of exposure moving said mask to place next stripe to be exposed into said field;deflecting said illumination beam in the exposed stripe to illuminate each subfield of said mask; andstitching the images of said subfields in order to obtain a complete image of said pattern on said exposure surface,wherein the method further includes forming on the mask at the ends of two adjacent stripes two end subfields having the same portion of the pattern; and exposing each of the end subfields by approximately half the exposure time amount in such a fashion that images of said two end subfields overlap on substantially the same position on said exposure surface which is in a stitching part of the images of said two stripes.