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Fluorescent substance, fluorescent composition, fluorescent mark carrier and optical reader therefor

  • US 6,688,789 B2
  • Filed: 05/16/2001
  • Issued: 02/10/2004
  • Est. Priority Date: 03/17/1994
  • Status: Expired due to Fees
First Claim
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1. An inked ribbon characterized in that it comprises a tape-like carrier deposited with a fluorescent composition comprising a fluorescent substance containing at least one of Nd and Yb as an optical active element and, other than this optical active element, at least one oxide of one of Mo and W and an alkaline earth metal, which fluorescent substance is dispersed and retained in an organic binder, wherein the organic binder is a mixture of wax and resin, and wherein the fluorescent substance has an average particle size of not more than 1 micron.

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