Patent ID: 9316926
Filing Date: 2016-04-19
CPC Classification: G03F

Claim Text:
1. A lithographic apparatus having at least one optical column, the optical column comprising: a programmable patterning device configured to provide a plurality of radiation beams; a projection system configured to project the plurality of beams onto a substrate, the projection system comprising a plurality of lenses; a first actuator system, configured to move at least one of the lenses in a direction perpendicular to the optical axis of the projection system to scan the plurality of beams over a target portion of the substrate; a radiation beam expander, configured to project an image of the programmable patterning device onto the at least one lens; a second actuator system, configured to move the radiation beam expander in a direction parallel to the optical axis of the projection system; and a control system configured to control the second actuator system in order to control a focus between the substrate and the at least one lens to a certain position.