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Substrate provided with an alignment mark in a substantially transmissive process layer, mask for exposing said mark, device manufacturing method, and device manufactured thereby

  • US 7,759,029 B2
  • Filed: 11/06/2008
  • Issued: 07/20/2010
  • Est. Priority Date: 05/23/2001
  • Status: Expired due to Fees
First Claim
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1. A device manufacturing method, comprising:

  • providing a substrate comprising an alignment mark that is disposed in a transmissive layer, the alignment mark comprising a relatively high reflectance area and a low reflectance area that is at least partially covered by a layer of radiation sensitive material;

    aligning the alignment mark to a reference, with an alignment beam of radiation;

    providing a projection beam of radiation using a radiation system;

    using a patterning structure to endow the projection beam with a patterned cross-section; and

    projecting the patterned beam of radiation onto a target portion of the layer of radiation sensitive material,wherein the relatively high reflectance area comprises a plurality of substantially linear sub-gratings, at least one of the substantially linear sub-gratings comprising a plurality of spaced square regions.

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