Patent ID: 8416490
Filing Date: 2013-04-09
Classification: G02B,G03F

Abstract:
1. A catadioptric projection objective for imaging a pattern provided in an object surface of the projection objective onto an image surface of the projection objective comprising: a first, refractive objective part for imaging the pattern provided in the object surface into a first intermediate image; a second objective part for imaging the first intermediate image into a second intermediate image; a third, refractive objective part for imaging, the second intermediate image onto the image surface; wherein the second objective part includes a first concave mirror having a first continuous mirror surface and a second concave mirror having a second continuous mirror surface; pupil surfaces are formed between the object plane and the first intermediate image, between the first and the second intermediate images and between the second intermediate image and the image plane; all concave mirrors are arranged optically remote from a pupil surface; wherein a first optical axis length OAL