Photocopying – Projection printing and copying cameras – Illumination systems or details
Reexamination Certificate
2007-08-24
2011-11-01
Nguyen, Hung Henry (Department: 2882)
Photocopying
Projection printing and copying cameras
Illumination systems or details
C359S490020, C355S053000, C355S067000
Reexamination Certificate
active
08049866
ABSTRACT:
A polarization control device for a lithography system selectively polarizes light in horizontal, vertical and/or circular orientations. A pair of relatively rotatable quarter-wave plates move to provide the desired polarization. When the quarter-wave plates are at a relative angle of 45 degrees, the polarization is circular. When the quarter-wave plates are both at zero or 45 degrees, the resulting polarization is vertical or horizontal. The polarization is selected based on the orientation of an image to be projected. Horizontal polarization is preferably used for images with a strong horizontal orientation, and vertical polarization is selected for images with a strong vertical orientation. Circular orientation is selected when the image has no strong horizontal or vertical orientation.
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ASML Holding N.V.
Nguyen Hung Henry
Sterne Kessler Goldstein & Fox P.L.L.C.
Whitesell-Gordon Steven H
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