Patent ID: 6124596
Filing Date: 2000-09-26
Classification: B82Y,H01J

Abstract:
A charged-particle-beam projection-microlithography apparatus for transferring a mask pattern image to a sensitive substrate using a charged-particle beam, the apparatus comprising along an optical axis in the trajectory direction of the charged-particle beam:(a) a charged-particle-beam source for emitting the charged-particle-beam;(b) a first condenser lens for converging the charged-particle-beam at a first crossover;(c) a field-limiting aperture for shaping a field, transverse to the optical axis, of the charged-particle beam and for transmitting the beam onto a region of a pattern defined by a mask;(d) a projection-optical system, comprising first and second projection lenses, for imaging the charged-particle beam transmitted by the mask and projecting a demagnified mask-pattern image onto the sensitive substrate; and(e) a first astigmatic-aberration-correction coil positioned in a vicinity of a principal plane of either of the first and second projection lenses for correcting linear distortion of the demagnified mask-pattern image on the sensitive substrate, the first astigmatic-aberration-correction coil being connected to a plurality of power supplies so as to receive an electric current from the power supplies.