Patent ID: 7126757
Filing Date: 2006-10-24
Classification: G03F

Abstract:
1. An illumination optical system comprising: a first optical system for illuminating a plurality of condensing systems of a third light integrator with light from a light source; and a second optical system for illuminating an illuminated plane with light from the plurality of condensing systems of the third light integrator, wherein said first optical system includes a first light integrator having a plurality of condensing systems and a first condenser lens that forms a Fourier transformation relationship between a light exit plane of the first light integrator and a light incidence plane of the third light integrator; and wherein said second optical system includes a second light integrator having a plurality of condensing systems and a second condenser lens that forms a Fourier transformation relationship between a light exit plane of the third light integrator and a light incidence plane of the second light integrator, and wherein each side on an outline of a light incidence plane of each condensing system of the third light integrator is not parallel to any one of sides that form an outline of a light incidence plane of condensing systems of the first light integrator, and wherein each side on the outline of the light incidence plane of each condensing system of the third light integrator is not parallel to any one of sides that form an outline of a light incidence plane of each condensing system of the second light integrator.