Patent ID: 7242457
Filing Date: 2007-07-10
Classification: G03F

Abstract:
1. A scanning exposure apparatus, comprising: an illumination optical system for illuminating an original with light from a light source; and a projection optical system for projecting a pattern of the original onto a substrate; wherein said illumination optical system includes an optical integrator of wavefront division type, for forming a secondary light source by use of light from the light source and a condenser optical system for directing light from said optical integrator to the original; wherein said projection optical system includes an optical element made of a glass material of quartz and being disposed adjacent a pupil plane of said projection optical system; and wherein, regarding the number of division upon the pupil plane of the projection optical system, where said optical integrator of wavefront division type is divided by a number N with respect to a scan direction and also said optical integrator is divided by a number M with respect to a direction orthogonal to the scan direction, relations 100≦M≦300 and M≦N are satisfied.