Lithographic apparatus and method for calibrating the same

Photocopying – Projection printing and copying cameras – Detailed holder for photosensitive paper

Reexamination Certificate

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C355S053000, C355S030000, C355S077000

Reexamination Certificate

active

10899295

ABSTRACT:
Lithographic apparatus includes a substrate table and a motion control system for controlling a movement of the substrate table. The motion control system includes at least 3 position detectors constructed for detecting a position of the substrate table. For measuring a position and orientation of the substrate table, each position detector comprises an optical encoder of a single dimensional or multi dimensional type, the optical encoders being arranged for providing together at least 6 position values, at least one position value being provided for each of the 3 dimensions. 3 or more of the at least 3 optical encoders being connected to the substrate table at different locations in the 3 dimensional coordinate system. The motion control system is arranged to calculate the position of the substrate table in the 3 dimensional coordinate system from a subset of at least 3 of the 6 position values and to calculate an orientation of the substrate table with respect to the coordinate system from another subset of at least 3 of the 6 position values. Further, a method for calibrating the position detectors is described.

REFERENCES:
patent: 6285444 (2001-09-01), Osanai et al.
patent: 6285457 (2001-09-01), Ukaji
patent: 6686991 (2004-02-01), Binnard et al.
patent: 2002/0041380 (2002-04-01), Kwan
patent: 2003/0179357 (2003-09-01), Ravensbergen
patent: 2004/0051881 (2004-03-01), Holzapfel et al.
patent: 2005/0168714 (2005-08-01), Renkens et al.
patent: 2006/0023178 (2006-02-01), Loopstra et al.
patent: 1 182 509 (2002-02-01), None
patent: 1 400 855 (2004-03-01), None
Singapore Patent Office Communication—Invitation to Respond to Written Opinion dated Aug. 14, 2006.
Australian Written Opinion and Search Report mailed Jul. 6, 2006.

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