Patent ID: 6362871
Filing Date: 2002-03-26
Classification: G03F

Abstract:
A lithographic projection apparatus for imaging a mask pattern in a mask onto a substrate, comprising:a radiation system comprising a radiation source and an illumination system constructed and arranged to generate an illumination beam; a first movable object table provided with a mask holder constructed and arranged to hold a mask, the mask having a plurality of transmissive regions bounded by opaque regions; a second movable object table provided with a substrate holder constructed and arranged to hold a substrate, said substrate having a radiation sensitive layer; and a projection system constructed and arranged to image irradiated portions of the mask onto target portions of the substrate, said illumination system being configured to change a size of the illumination beam on the mask during an exposure period of at least part of any given transmissive region to generate a time integrated intensity trapezoidal beam profile.