Patent ID: 7609362

Claim:
A lithographic apparatus, comprising: optical columns comprising patterning systems and projection systems, wherein, each of the patterning systems are configured to emit a corresponding patterned beam, each of the projection systems are configured to project the patterned beams onto corresponding target portions of a substrate, the projection systems comprising an array of lenses, such that each lens in the array directs a respective part of a respective one of the patterned beams towards the substrate; and a displacement system configured to cause relative displacement between the substrate and the projection systems, such that the patterned beams are scanned across the substrate in a predetermined scanning direction, wherein the projection systems are positioned to allow each patterned—beam to be scanned along a respective one of a series of overlapping tracks on the substrate, wherein each of the tracks comprises, a first portion that is scanned by only one of the patterned beams, and at least one second portion that overlaps an adjacent track to the track and is scanned by two of the patterned beams; and wherein an intensity of each of the patterned beams is determined based on a misalignment between the patterned beams or a misalignment between the tracks.