Patent ID: 8885147

Claim:
A lithographic apparatus comprising: a support constructed to support a patterning device, the patterning device being capable of imparting a radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed to hold a substrate on a central area of the substrate table; a projection system configured to project the patterned radiation beam onto a target portion of the substrate in a first direction; and a positioning device configured to position the substrate table, the positioning device comprising a plurality of actuators arranged to exert forces to position the substrate table, each of the forces generated by four of the plurality of actuators, arranged along four different sides of the substrate table, substantially being directed in a same plane substantially perpendicular to the first direction, wherein the plurality of actuators are arranged outside a central volume of the substrate table, the central volume being obtained by projecting the central area along the first direction, wherein the plurality of actuators are arranged along the four sides of the substrate table, and wherein two of the plurality of actuators arranged on two opposite sides of the substrate table are configured to exert a force in a same direction that passes substantially through a center of gravity of said substrate table and wherein another two of the plurality of actuators arranged on another two opposite sides of the substrate table are configured to exert forces along two different directions that are parallel to each other and that do not pass through the center of gravity.