Patent ID: 8081295
Filing Date: 2011-12-20
Classification: G03F

Abstract:
1. A system for exposing a radiation- sensitive substrate, arranged in the region of an image surface of a projection objective, with at least one image of a pattern of a mask arranged in the region of an object surface of the projection objective, the system comprising: an illumination system for illuminating the pattern with the aid of illumination radiation from an illumination field; the illumination system comprising a pupil-shaping unit for receiving light of a primary light source and for producing a defined, spatial illumination intensity distribution in a pupil-shaping surface of the illumination system; a projection objective for producing an image of the pattern in the region of the image surface of the projection objective; and a scanning device for scanning the mask in such a way that during a total exposure time required to image the entire mask, initially a first pattern area of the mask with a first subpattern, and thereafter at least one second pattern area, arranged laterally offset from the first pattern area, of the mask with a second subpattern is irradiated with the illumination radiation of the illumination field; the illumination system being set up such that the first subpattern is irradiated during a first illumination time interval with a first angular distribution, adapted to the first subpattern, of the illumination radiation, and the second subpattern is irradiated with a second angular distribution, adapted to the second subpattern, of the illumination radiation during a second illumination time interval following the first illumination time interval, the second angular distribution differing from the first angular distribution, wherein: