Patent ID: 7209218

Claim:
An exposure apparatus comprising: an illumination optical system configured to irradiate a mask with light from a light source; and a projecting optical system configured to project a pattern image of the mask onto a substrate, wherein the illumination optical system includes a first optical unit configured to provide a first light intensity distribution, a second optical unit configured to change a shape of the first light intensity distribution so as to provide a second light intensity distribution, and a third optical unit configured to change a dimension of the second light intensity distribution so as to provide a third light intensity distribution, the first optical unit, the second optical unit, and the third optical unit being arranged in that order from the light source, and wherein a symmetry of the third light intensity distribution and a center of gravity of the third light intensity distribution are individually adjustable by decentering in an optical path of the illumination optical system at least two of the first optical unit, the second optical unit, and the third optical unit.