Patent ID: 8044373

Claim:
A lithographic apparatus comprising: a patterning device support configured to hold a patterning device, the patterning device capable of imparting a radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate support constructed to hold a substrate; a projection system configured to project the patterned radiation beam onto a target portion of the substrate, the projection system comprising a projection system housing supporting internally a plurality of lens elements using mounting elements coupling the plurality of lens elements to the projection system housing; and a movement damper connected to, and arranged externally of, the projection system housing, the movement damper configured to damp movement of the projection system housing at an eigenfrequency of at least one of said plurality of lens elements that are arranged internally of the projection system housing, wherein the movement damper is a tuned mass damper, tuned on the eigenfrequency of the at least one of said plurality of lens elements.