Patent ID: 7045800

Claim:
An electron beam drawing apparatus comprising: an electron source for generating an electron beam; a reducing lens group for reducing said electron beam; an objective lens group for converging the reduced shaped beam on a sample plane; an object deflector for deflecting said shaped beam at a desired position on said sample plane; and a stage control circuit for moving and positioning the sample stage within the deflection range of said object deflector by detecting the position of the sample stage mounting said sample, wherein said objective lens group includes lenses of two stages, said electron beam drawing apparatus being constructed such that first the power of the objective lens of the lower stage is changed to change the deflection range of said object deflector and so that second the power of the objective lens of the upper stage is then changed to form the image on said sample plane, thereby to make a focusing, and a focal length of the objective lens of the lower stage is greater than a focal length of the objective lens of the upper stage.