Patent ID: 8072700
Filing Date: 2011-12-06
Classification: G02B,G03F

Abstract:
1. An apparatus, comprising: an interchange mechanism and an optical assembly, said optical assembly having a housing and having a plurality of optical elements arranged along a beam path to form a projection objective or an illuminating system, said plurality of optical elements including at least one selected optical element and a plurality of remaining optical elements, said selected optical element being selectable from among a plurality of selectable optical elements available from said interchange mechanism, said interchange mechanism being operable to insert said selected optical element into the beam path, and to remove said selected optical element from the beam path, said selected optical element being inserted into an operating position in the beam path, said operating position being a position at which said selected optical element is separate from said interchange mechanism, said interchange mechanism being supported by a structure which is substantially dynamically decoupled from said housing and from said remaining optical elements arranged along the beam path.