Patent ID: 7714985

Claim:
A projection optical system that projects an image of a pattern of a first object onto a second object, the projection optical system comprising: a first image forming optical system that forms an intermediate image of the pattern, the first image forming optical system including a concave mirror and a reflecting mirror, the concave mirror having a reflecting surface that opposes the second object, the reflecting mirror directing light from the first object to the concave mirror; a second image forming optical system that forms an image of the intermediate image onto the second object, the second image forming optical system including a lens; and a light-shielding member disposed between the concave mirror and the lens, wherein an optical axis of the projection optical system does not pass through an area of the reflecting surface of the reflecting mirror where the light from the first object is reflected, and passes through the light-shielding member, and wherein a pupil plane of the projection optical system is free of a void area.