Patent ID: 7551261
Filing Date: 2009-06-23
Classification: G03F

Abstract:
1. An illumination system for a microlithography projection exposure apparatus for illuminating an illumination field with light from a primary light source, comprising: a light distribution device receiving light from the primary light source and generating a predetermined, two-dimensional intensity distribution from the light from the primary light source in a first surface of the illumination system; a first raster arrangement comprising first raster elements receiving the spatial, two-dimensional intensity distribution and generating a raster arrangement of secondary light sources; a second raster arrangement comprising second raster elements receiving light from the secondary light sources and at least partially superimposing light from the secondary light sources in the illumination field; the light distribution device comprising at least one diffractive optical element generating an angular distribution whose far field has separate or contiguous luminous zones which are coordinated in terms of form and size with the form and size of individual first raster elements of the first raster arrangement.