Patent ID: 9372412
Filing Date: 2016-06-21
CPC Classification: G03F

Claim Text:
1. A lithographic apparatus comprising: a self-emissive contrast device configured to emit a beam; a projection system configured to project the beam along an optical path onto a target portion of a substrate, the projection system comprising an optical element; an actuator to move at least the optical element with respect to the substrate; a first surface facing and immediately adjacent a radiation receiving surface of the optical element and with respect to which the radiation receiving surface of the optical element is movable, the first surface not having optical power and at least partly overlying the radiation receiving surface; a second surface facing and immediately adjacent a radiation emitting surface of the optical element and with respect to which the radiation emitting surface of the optical element is movable; and a control system configured to cause the self-emissive contrast device to modulate emission of the beam during projection and to cause the actuator to move the optical element during projection in a direction transverse to the optical path of the beam with respect to the first and second surfaces.