Patent ID: 6947124
Filing Date: 2005-09-20
Classification: B82Y,G03F,G21K

Abstract:
1. Illumination system, particularly for microlithography with wavelengths ≦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 are rectangular, wherein said field is a segment of an annulus, wherein said second optical component includes a first field mirror with negative optical power for shaping said field to said segment of said annulus and a second field mirror with positive optical power, wherein each of a plurality of rays intersects said first field mirror with an incidence angle greater than 70°, and wherein each of said plurality of rays intersects said second field mirror with an incidence angle of less than 25°.