Patent ID: 8436980

Claim:
An exposure apparatus comprising: an illumination optical system that illuminates a reticle using a light beam from a light source; a projection optical system that projects a pattern of the reticle onto a substrate; a relay optical system that guides the light beam from the light source to the illumination optical system; and a chamber configured to accommodate the illumination optical system, the chamber including an opening configured to guide the light beam from the light source to said illumination optical system, wherein the relay optical system includes: an enlarging imaging optical system disposed between the light source and the illumination optical system; and a reduction optical system disposed between the enlarging imaging optical system and the illumination optical system, wherein the enlarging imaging optical system is formed so that an image plane is disposed between the light source and the reduction optical system, wherein the enlarging imaging optical system causes the light source and the image plane of the enlarging optical system to be optically conjugately disposed, wherein the image plane of the enlarging imaging optical system is disposed between the enlarging imaging optical system and the reduction optical system, and wherein the image plane of the enlarging imaging optical system is situated at the opening or in the vicinity of the opening.