Catadioptric objective
View Patent ↗A catadioptric objective comprises a plurality of lenses and at least two deflecting mirrors that have reflecting surfaces that are at a specific angle, in particular of 90°, to one another. The two deflecting mirrors are arranged with their reflecting surfaces on a common base member whose position in the objective can be set.
1. A device for semiconductor microlithography comprising a projection exposure objective that includes a plurality of lenses and at least two deflecting mirrors that have reflecting surfaces that are fixed at a specific angle to one another, wherein the two deflecting mirror are arranged with their reflecting surfaces on a common base member and wherein the base member is a reduced mass construction with measures selected from the group consisting of bores, cutouts, milled-out portions, an approximate frame structure and stiffening ribs.
2. The objective as claimed in claim 1 , wherein the base member is mounted to a manipulator to initiate an adjusting movement.