Illumination system with spatially controllable partial...

Photocopying – Projection printing and copying cameras – Step and repeat

Reexamination Certificate

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C355S067000, C355S071000

Reexamination Certificate

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07092070

ABSTRACT:
An illumination system having an array optical element with different illumination regions corresponding or matched to different line width variations printed on a photosensitive material. The array optical element may be a filter, diffractive optical element, or micro lens array having illumination regions producing different types of illumination properties or characteristics. Each of the illumination regions are matched or correspond to a respective region on a patterning device to provide optimized exposure of a photosensitive material. The optical element may be used to tailor a conventional illumination system to the unique characteristics of the projection optics used in a system, thereby compensating for vertical and horizontal bias or variations in line width for features oriented in the vertical and horizontal direction.

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