Patent ID: 8736813

Claim:
An exposure apparatus for transferring a mask pattern from a mask surface of a mask to at least one substrate, the exposure apparatus comprising: an illumination system that directs a first beam at the mask surface and a second beam at the same time at the mask surface, the illumination system comprising an input optical assembly and a segmented imaging condenser assembly, the segmented imaging condenser assembly includes a first lenslet array and a second lenslet array that is spaced apart from the first lenslet array, wherein the input optical assembly supplies a first source beam and a second source beam to the segmented imaging condenser assembly, each of the first source beam and the second source beam being directed through both the first lenslet array and the second lenslet array, wherein the first beam is generated from the first source beam, wherein the second beam is generated from the second source beam, and wherein a position of the first beam is different from a position of the second beam at the mask surface.