Patent ID: 7081945

Claim:
A device manufacturing method, comprising: providing a beam of radiation using a radiation system; providing first and second patterning devices which are held on a support, the first patterning device comprising features only in a first direction and the second patterning device comprising features only in a second direction substantially perpendicular to the first direction; using one of the first and second patterning devices to endow the beam of radiation with a pattern in its cross-section; projecting the patterned beam of radiation onto a target portion of a layer of radiation-sensitive material at least partially covering a substrate; projecting a first pattern on the first patterning device onto the target portion; subsequently projecting a second pattern on the second patterning device onto the same target portion before projecting one of the first and second patterns onto another target portion; projecting the first pattern while scanning the first pattern in a scan direction; and subsequently projecting the second pattern while scanning the second pattern in a direction opposite to the scan direction.