Patent ID: 6326629
Filing Date: 2001-12-04
Classification: B82Y,H01J

Abstract:
A lithography device for carrying out projection lithography by means of a beam of charged particles,which device includes an imaging particle-optical system for imaging a lithographic object structure (14) on a lithographic imaging surface (16) by means of said beam of charged particles,said particle-optical system including a substantially telescopic system with first and second round particle lenses (10, 12) which are arranged to produce first and second rotationally symmetrical lens fields, respectively,characterized in thatthe particle-optical system includes first quadrupole means (10-6) and second quadrupole means (12-6) which are arranged to produce first and second quadrupole fields, respectively,converging effects of said quadrupole fields on the beam intersecting one another at substantially right angles,said first and second quadrupole fields being substantially coincident with the first and the second rotationally symmetrical lens fields, respectively,the strength of the quadrupole fields being such that the lithographic object structure to be imaged is stigmatically imaged on the lithographic imaging surface.