Assembly, a lithographic apparatus, and a device manufacturing method

摘要

A lithographic apparatus includes a projection optics assembly for projecting a patterned beam onto a target portion of a substrate. The projection optics assembly includes a first element having a predetermined functionality that is positioned with respect to a second element in a spaced relationship on a support frame. The support frame has an interface surface formed on or in the support frame for receiving the first element. The interface surface determines the position of the first element with respect to the second element, and is configured in accordance with the predetermined functionality so that the first element is positionable with respect to the second element with at least three degrees of freedom.