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Lithographic apparatus, device manufacturing method, and device manufactured thereby

  • US 6,727,977 B2
  • Filed: 06/06/2002
  • Issued: 04/27/2004
  • Est. Priority Date: 06/06/2001
  • Status: Expired due to Fees
First Claim
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1. A lithographic projection apparatus, comprising:

  • a radiation system constructed and arranged to provide a projection beam of radiation;

    a support structure constructed and arranged to support a patterning device, the patterning device constructed and arranged to pattern the projection beam according to a desired pattern;

    a substrate table to hold a substrate;

    a projection system constructed and arranged to project the patterned beam onto a target portion of the substrate, a first driving device constructed and arranged to move the support structure in a given reference direction substantially parallel to the plane of the patterning device;

    a second driving device constructed and arranged to move the substrate table parallel to the reference direction so as to be synchronous with the motion of the support structure;

    a first position measuring device constructed and arranged to determine the momentary position of the patterning device with respect to a fixed reference point;

    a second position measuring device constructed and arranged to determine the momentary position of the substrate table with respect to a fixed reference point;

    a position comparator constructed and arranged to compare the measured momentary position of the substrate table with a desired momentary position of the substrate table to generate a position error signal in accordance with a difference between the two positions; and

    a position error predictor that generates a future position error signal based on one or more previous position error signals; and

    a position correction device that adjusts the momentary position of the patterning device based upon the future position error signal.

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