Patent ID: 8174678
Filing Date: 2012-05-08
Classification: G03F

Abstract:
1. A lithographic apparatus comprising: an illumination system configured to condition a radiation beam; a patterning device support configured to support a patterning device, the patterning device capable of imparting the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed to hold a substrate; and a projection system configured to project the patterned radiation beam in a scanning exposure along a scanning direction onto a target portion of the substrate, wherein the illumination system is configured to form in a plane of the patterning device a slit shaped image having a curved shape with a slit curvature in the scanning direction, the illumination system being configured to vary the slit curvature during the scanning exposure of the substrate, the slit shaped image having a length in the scanning direction and a width substantially perpendicular to the scanning direction, the slit shaped image configured to create a curved pattern image portion of the patterned radiation beam in an image plane of the projection system.