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Patterning device cooling apparatus

  • US 10,642,166 B2
  • Filed: 07/22/2019
  • Issued: 05/05/2020
  • Est. Priority Date: 04/04/2016
  • Status: Active Grant
First Claim
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1. A patterning apparatus for a lithographic apparatus, the patterning apparatus comprising:

  • a patterning device support structure configured to support a patterning device having a planar surface;

    a first gas outlet configured to provide a first gas flow over the planar surface in use with a directional component parallel to the planar surface, the first gas outlet configured to be connected to a gas supply and control system;

    a second gas outlet configured to provide a second gas flow over the planar surface in use with a directional component parallel to the planar surface, the second gas outlet configured to be connected to the gas supply and control system,wherein the first gas outlet and the second gas outlet are arranged at different distances perpendicular to the planar surface and the first and second gas outlets are arranged to provide their respective gas flows to be in contact with the planar surface in use.

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