Patent ID: 7372624

Claim:
A projection objective that provides a light path for a light bundle from an object field in an object plane to an image field in an image plane, said projection objective comprising: a first mirror (S 1 ) in said light path; a second mirror (S 2 ) in said light path, after said first mirror; a third mirror (S 3 ) in said light path, after said second mirror; a fourth mirror (S 4 ) in said light path, after said third mirror; a fifth mirror (S 5 ) in said light path, after said fourth mirror; a sixth mirror (S 6 ) in said light path, after said fifth mirror; a seventh mirror (S 7 ) in said light path, after said sixth mirror; and an eighth mirror (S 8 ) in said light path, after said seventh mirror, wherein said eighth mirror is concave, wherein said light bundle includes light with a wavelength in a range of 10-30 nm, wherein said light path is provided via said eight mirrors, and wherein said light path is free of obscuration.