Patent ID: 6566662
Filing Date: 2003-05-20
Classification: B82Y,H01J

Abstract:
A charged beam exposure system comprising:a charged beam source; a movable stage on which a specimen is supported, said system writing a pattern by moving said stage at a fixed speed for a frame field, which is a unit of writing determined by a deflection width of a main deflected beam, and said system irradiating the charged beam only for frame fields that are to be exposed; and a stage moving control unit configured to determine, before frame field writing, said fixed speed for a frame field by: calculating a segment writing time for each of a plurality of segments partitioned from said frame field in a stage moving direction, calculating a block writing time for each of a plurality of blocks of said segment, each block being a consecutive series of said segments and having at least one segment common to another block such that adjacent blocks overlap one another, and determining a longest block writing time from the calculated writing times for the plurality of blocks and setting said fixed speed as the longest block writing time.