Photocopying – Projection printing and copying cameras – Illumination systems or details
Reexamination Certificate
2008-04-15
2008-04-15
Nguyen, Henry Hung (Department: 2851)
Photocopying
Projection printing and copying cameras
Illumination systems or details
C355S053000
Reexamination Certificate
active
11441482
ABSTRACT:
The invention concerns imaging systems, in particular for a microlithographic projection exposure apparatus, for imaging a mask which can be positioned in an object plane of the imaging system on to a photosensitive layer which can be positioned in an image plane of the imaging system. An imaging system according to the invention comprises: an object plane-side subsystem which produces a first intermediate image with an object plane-side imaging scale βo, at least one further subsystem which produces a further intermediate image between the first intermediate image and the image plane, and an image plane-side subsystem which images the further intermediate image into the image plane with an image plane-side imaging scale βi, wherein the condition 0.75≦βo*βi≦1.25 is satisfied.
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Carl Zeiss SMT AG
Nguyen Henry Hung
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