Patent ID: 7483122

Claim:
A projection exposure apparatus having an illumination optical system for illuminating an arc region spaced from an optical axis on a mask set at a first plane, a reflective type projection optical system for forming an image of a pattern formed on the mask in the arc region spaced from the optical axis on a photosensitive substrate set at a second plane, and a stage system for holding the mask and the photosensitive substrate so as to be scanned, wherein: in the arc region, the width in the scan movement direction is relatively narrow with respect to a width in a direction perpendicular to the scan movement direction; and the projection optical system is provided with an aperture stop for defining a numerical aperture, and an aperture shape of the aperture stop has a first diameter in a direction corresponding to the scan movement direction that is larger than a second diameter in a direction corresponding to a direction perpendicular to the scan movement direction.