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Systems and methods for reading indicium

  • US 7,651,031 B2
  • Filed: 10/25/2004
  • Issued: 01/26/2010
  • Est. Priority Date: 10/25/2004
  • Status: Expired due to Fees
First Claim
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1. A system for detecting indicium, the indicium having at least one emissivity value, the system comprising:

  • an energy generation device that provides energy to affect a relative temperature of the indicium; and

    a sensor that detects differential emissivity values, including the at least one emissivity value of the indicium, wherein;

    the indicium resides on a substrate having an emissivity value different from the at least one emissivity value;

    an intervening layer having an emissivity value different from the at least one emissivity value is disposed between the substrate and the indicium; and

    the sensor detects a difference in energy emitted by at least one combination from the group comprising the intervening layer, the indicium and the substrate.

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