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Lithographic apparatus, device manufacturing method and displacement measurement system

  • US 9,575,416 B2
  • Filed: 08/02/2013
  • Issued: 02/21/2017
  • Est. Priority Date: 08/23/2012
  • Status: Active Grant
First Claim
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1. A lithographic apparatus comprising:

  • a support structure constructed to support a patterning device, the patterning device being capable of imparting a radiation beam with a pattern to form a patterned radiation beam;

    a substrate table constructed to hold a substrate;

    a projection system configured to project the patterned radiation beam onto a target portion of the substrate; and

    a displacement measuring system arranged to determine a position quantity of a moveable object,wherein the moveable object comprises one of the support structure and the substrate table,wherein the displacement measuring system comprises an encoder and a grid structure,wherein one of the encoder and the grid structure is connected to the moveable object,wherein the grid structure comprises a high precision grid portion and a low precision grid portion,wherein the encoder is arranged to cooperate with the high precision grid portion to determine the position quantity relative to the grid structure with a high precision,wherein the encoder is arranged to cooperate with the low precision grid portion to determine the position quantity relative to the grid structure with a low precision, andwherein the high precision grid portion is provided closer to the projection system than the low precision grid portion.

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