Patent Number: 
Section: claims

1. An illumination system, particularly for microlithography with wavelengths≦193 nm, comprising:a primary light source(8001, 8101, 8401) ; a first optical component; a second optical component(8021, 8121, 8421) ; an image plane(8029, 8129, 8429) ; and an exit pupil(8033, 8133) , wherein said first optical component transforms said primary light source(8001, 8101, 8401)  into a plurality of secondary light sources that are imaged by said second optical component in said exit pupil(8033, 8133) , wherein said first optical component includes a first optical-element  optical element having a plurality of first raster elements (8009, 8109, 8409)  that are imaged into said image plane(8029, . . . ) , producing a plurality of images being superimposed, at least partially, on a field in said image plane(8029, . . . ) , wherein said first optical component comprises a collector unit(8003, 8103, 8403)  and a second optical element having a plurality of second raster elements(8015, 8115, 8415) , said illumination system further comprising: a first optical axis(8045.1)  between said collector unit(8003, . . . )  and said first optical element, wherein said first optical element is reflective; a second optical axis(8045.2)  between said first optical element and said second optical element, wherein said second optical element is reflective; and a third optical axis(8045.3)  between said second optical element and said second optical component(8021, 8121, 8421) , wherein the  a directional vector(8046.1)  of the first optical axis(8045.1)  and the  a directional vector (8046.2)  of the second optical axis (8046.2)  define a plane and wherein said first and second optical elements are tilted to cause a crossing or  of the projection of said third optical axis (8045.3)  into said plane and said first optical axis, second optical element, wherein said second optical element is reflective; and a third optical axis (8045.3) between said second optical element and said second optical component (8021, 8121, 8421), wherein the directional vector (8046.1) of the first optical axis (8045.1) and the directional vector (8046.2) of the second optical axis (8045.2) define a plane and wherein said first and second optical elements are tilted to cause a crossing of the projection of said third optical axis (8045.3) into said plane and said first optical axis .  2. The illumination system according to claim 1, further comprising:a first beam path along said first optical axis) ; a second beam path along said second optical axis) ; and a third beam path along said third optical axis, wherein said first and said second optical elements are tilted to cause a crossing of said third beam path and said first beam path.  3. The illumination system according to claim 1,wherein said primary light source produces a beam cone oriented in a first direction, wherein said image plane has a surface normal that is substantially perpendicular to said first direction, wherein said first optical component comprises at least one first mirror, and wherein said second optical component comprises at least one second mirror, said illumination system having a beam path between said primary light source and said image plane that is bent with said at least one first mirror and said at least one second mirror.  4. The illumination system according to claim 1, further comprising:a straight line from a center of said field in said image plane to a center of said exit pupil; and an angle between said straight line and a surface normal of said image plane, wherein said angle is between 3° and 10°.  5. The illumination system according to claim 1, wherein each of a plurality of rays intersects said first and second optical components with incidence angles of greater than 65° or less than 25°. 6. The illumination system according to claim 1, wherein said second optical component comprises an even number of normal incidence mirrors having incidence angles of loss  less than 25°. 7. The illumination system according to claim 1,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 form one another.  8. The illumination system according to claim 1,wherein each of said plurality of first raster elements corresponds to one of said plurality of second raster elements, wherein each of said plurality of first raster elements deflects one of said plurality of incoming ray bundles to said corresponding one of said plurality of second raster elements, and wherein said plurality of second raster elements and said second optical component image said corresponding first raster elements into said image plane.  9. The illumination system according to claim 8, wherein said plurality of second raster elements are concave mirrors. 10. The illumination system according to claim 1,wherein said field is a segment of an annulus, wherein said plurality of first raster elements are rectangular, and wherein said second optical component comprises a first field mirror for shaping said field to said segment of said annulus.  11. The illumination system according to claim 10,wherein said first field mirror has negative optical power, and wherein said second optical component comprises a second field mirror with positive optical power.  12. The illumination system according to claim 10,wherein said second optical component comprises a third field mirror, and wherein said third field mirror has negative optical power.  13. The illumination system according to claim 12, wherein said third field mirror,  has positive optical power. 14. A projection exposure apparatus for microlithography comprising:the illumination system of claim 1; a reticle being located at said image plane; a light-sensitive object on a support system; and a projection objective to image said reticle onto said light-sensitive object.  15. The projection exposure apparatus of claim 14, further comprising:an illumination beam path between said primary light source and said reticle that passes through said first optical component and said second optical component; and a projection beam path between said reticle and said light-sensitive object that passes through said projection objective, wherein said illumination beam path and said projection beam path do not cross.  16. The projection exposure apparatus of claim 14, further comprising:a projection beam path between said reticle and a first imaging element of said projection objective, wherein said reticle is reflective, and wherein said projection beam path is tilted towards an optical axis of said projection objective.