Patent ID: 7518705

Claim:
A lithographic apparatus, comprising: an illumination system configured to condition a radiation beam; a support constructed to support a first and a second patterning device, each patterning device being 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 onto a target portion of the substrate, wherein the illumination system comprises a radiation beam path adaptation device configured to adapt a radiation beam path to allow subsequent projections of a pattern of the first patterning device and a pattern of the second patterning device during a single scanning movement of the patterning device support, wherein the radiation beam path adaptation device comprises a patterning device masking device configured to, at least in a scanning direction, delimit a beam dimension of the radiation beam, wherein the patterning device masking device is arranged in a focus plane of the illumination system.