Patent ID: 7999914
Filing Date: 2011-08-16
Classification: G03F

Abstract:
1. A lithographic apparatus, comprising: a projection system configured to project a patterned radiation beam onto a target portion of a substrate; a deformable lens element through which the patterned radiation beam is arranged to pass before reaching the substrate; a plurality of magnetic dipoles connected to the deformable lens element and oriented substantially tangentially with respect thereto so as to form a path of alternating north and south poles; and a plurality of magnetic actuators configured to interact with one or more magnetic dipoles of the plurality of magnetic dipoles so as to apply (i) a tangential bending moment, or (ii) a radial bending moment, or (iii) a force with a component substantially parallel to the optical axis of the projection system, or (iv) any combination selected from (i)-(iii), to a portion of the deformable lens element to change the shape of the deformable lens element.