Patent ID: 6791664
Filing Date: 2004-09-14
Classification: G03F

Abstract:
A lithographic projection apparatus comprising:a radiation system to provide a projection beam of radiation; a table to support patterning structure, which pattering structure can be used to pattern the projection beam according to a desired pattern; a substrate table to hold a substrate; and a vibrationally isolated portion of the apparatus silent world supported by a vibration isolation system and comprising a projection system to image the patterned beam onto a target portion of the substrate; a detector to observe relative movement between a first and a second portion of said vibrationally isolated portion of the apparatus, and generating at least one movement signal representative thereof; an actuator responsive to at least one control signal for exerting a force upon a portion of said vibrationally isolated portion of the apparatus; and a controller responsive to said at least one movement signal to generate said at least one control signal to reduce relative movement between said first and said second portion.