Patent ID: 6377336
Filing Date: 2002-04-23
Classification: G03F

Abstract:
An exposure apparatus which exposes a substrate with an illumination beam irradiated on a mask, comprising:an illumination optical system disposed on an optical path along which the illumination beam passes to illuminate the mask with the illumination beam of which an intensity distribution, on a Fourier transform plane with respect to a pattern surface of the mask, is determined in accordance with a pattern to be transferred on the substrate, the illumination optical system forming the intensity distribution with an increased intensity portion apart from an optical axis of the illumination optical system relative to a portion of the intensity distribution on the optical axis; and a plurality of prisms of which at least one is movable along the optical axis, arranged on the optical axis in said illumination optical system to adjust a positional relationship between the increased intensity portion and the optical axis by moving the at least one prism along the optical axis.