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Detector

  • US 7,646,303 B2
  • Filed: 11/13/2006
  • Issued: 01/12/2010
  • Est. Priority Date: 11/21/2002
  • Status: Expired due to Fees
First Claim
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1. A printer operable to print on a base medium provided with at least one memory tag, the printer comprising a detector for detecting the presence of a memory tag, the detector comprising a radio frequency source operable to generate a radio frequency signal and a detector resonant circuit part connected to the radio frequency source, the detector resonant circuit part comprising an antenna,the detector further comprising a power monitor responsive to the power of a reflected signal returned from the detector resonant circuit part,the power monitor being operable to generate an output in response to the power of the reflected signal,wherein a decrease in the power of the reflected signal indicates the presence of a tag in the vicinity of the antenna.

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