Patent ID: 6833907
Filing Date: 2004-12-21
Classification: G03F

Abstract:
A lithographic projection apparatus comprising:a radiation system to provide a beam of radiation, comprising an illumination system that defines an intensity distribution of the beam at a plane, the illumination system comprising adjusting structure to control an angular intensity of the intensity distribution such that at least one localized portion of the intensity distribution has a higher intensity than at least another localized portion of the intensity distribution; patterning structure that patterns the beam according to a desired pattern; a substrate table to hold a substrate; and a projection system to project the patterned beam onto a target portion of the substrate; the adjusting structure comprising at least one exchanger for inserting and removing at least one of a plurality of optical elements into and out of the beam path, each of the said optical elements defining a particular intensity distribution, and the adjusting structure being configured to provide at least one hybrid illumination pattern in said plane by moving the at least one of the plurality of optical elements substantially perpendicularly to said beam path.