Patent ID: 7378671

Claim:
A charged particle beam lithography machine for exposing a target exposure surface by using a plurality of charged particle beams, said machine comprising: a charged particle source to emit a charged particle beam; an aperture substrate which has a plurality of apertures to divide the charged particle beam from said charged particle source into a plurality of charged particle beams; a plurality of electron optical systems which have the apertures as pupils; a charged particle beam optical system which projects, to the target exposure surface, charged particle source images formed by said plurality of electron optical systems; a unit adapted to set the apertures of said aperture substrate to an aperture for exposure and an aperture for aberration measurement to make the plurality of charged particle beams strike said charged particle beam optical system at different incident angles; and a detecting unit adapted to detect a position where the plurality of charged particle beams, which have passed through the aperture for aberration measurement, form images on an image surface of said charged particle beam optical system.