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Diffractive optical element and image reader using the same

  • US 6,683,718 B2
  • Filed: 09/25/2001
  • Issued: 01/27/2004
  • Est. Priority Date: 10/02/2000
  • Status: Expired due to Fees
First Claim
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1. A diffraction optical element formed by laminating a plurality of diffraction gratings having a plurality of grating surfaces, wherein two non-overlapping grating surfaces adjacent to each other along an incident direction of a light satisfy the following relation:

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