Patent ID: 6490105
Filing Date: 2002-12-03
Classification: G02B,G03F

Abstract:
A retention system for securing a mirror to a mounting surface of a wafer stage movable along an axis, wherein the mirror includes a substantially planar reflective surface, a rear surface, and an exposed surface, and wherein the reflective surface is substantially perpendicular to the axis, the retention system comprising:at least one first bracket adapted to engage the wafer stage and the mirror to restrain motion of the mirror relative to the wafer stage in at least a direction parallel to the axis, the at least one first bracket comprising a substantially planar contact surface adapted to engage a first one of the reflective surface and the rear surface of the mirror; and at least one second bracket adapted to engage the wafer stage and the mirror to restrain motion of the mirror relative to the wafer stage in at least a direction parallel to the axis, the at least one second bracket comprising a substantially planar contact surface adapted to engage a second one of the reflective surface and the rear surface of the mirror.