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Systems and methods for reading indicium

  • US 8,235,298 B2
  • Filed: 12/21/2009
  • Issued: 08/07/2012
  • Est. Priority Date: 10/25/2004
  • Status: Active Grant
First Claim
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1. A system for detecting indicium, the indicium comprising a first element having a first emissivity value and a second element having a second emissivity value different from the first emissivity value, the system comprising:

  • an electromagnetic energy source that provides energy to affect a relative temperature of the indicium; and

    a sensor that detects differential emissivity values based at least partially on the first emissivity value of the indicium and the second emissivity value of the indicium, wherein;

    the indicium resides on a conductive layer; and

    the electromagnetic energy source affects the relative temperature of the indicium by increasing a temperature of the conductive layer.

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