Patent ID: 6172740
Filing Date: 2001-01-09
Classification: G03F

Abstract:
A projection exposure apparatus, comprising:a projection optical system for projecting a pattern of a mask onto a substrate; anda stage for the substrate arranged to be movable in directions X and Y each of which is perpendicular to an optical axis of said projection optical system and which are perpendicular to each other,wherein said projection optical system has a pair of aspherical members, at least one of which is displaceable in a direction P which is perpendicular to the optical axis of said projection optical system and which differs from the directions X and Y, the direction P being at an angle of not less than 10 degrees and not greater than 80 degrees with respect to each of the directions X and Y,wherein a shape of an aspheric surface of each of said pair of aspherical members is determined such that a refractive power of said pair of aspherical members functioning as one system obtained at a section including the direction P varies accordingly as a positional relation in the direction P between the aspheric surfaces of said pair of aspherical members varies, said pair of aspherical members functioning as one system having no refractive power at a section including a direction perpendicular to the direction P, andwherein a refractive power at the section of said projection optical system is varied by displacing the at least one of said pair of aspherical members in the direction P.