Patent ID: 6438199
Filing Date: 2002-08-20
Classification: B82Y,G03F,G21K

Abstract:
An illumination system, particularly for microlithography with wavelengths &lE;193 nm, comprising:a primary light source; a first optical component; a second optical component; an image plane; and an exit pupil, wherein said first optical component transforms said primary light source into a plurality of secondary light sources that are imaged by said second optical component in said exit pupil, wherein said first optical component includes a first optical element having a plurality of first raster elements that are imaged into said image plane, producing a plurality of images being superimposed, at least partially, on a field in said image plane, wherein said plurality of first raster elements deflect a plurality of incoming ray bundles to produce a plurality of deflected ray bundles with first deflection angles, and wherein at least two of said first deflection angles are different from one another.