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Reader/writer and article sorting system

  • US 9,581,689 B2
  • Filed: 06/25/2008
  • Issued: 02/28/2017
  • Est. Priority Date: 06/28/2007
  • Status: Active Grant
First Claim
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1. A system which reads and writes information from and onto a non-contact information recording medium using an electric wave, the system comprising:

  • a reader/writer comprising;

    an antenna configured to radiate the electric wave and receive a reflected wave modulated by said non-contact information recording medium;

    a transmitter configured to transmit the electric wave to the non-contact information recording medium via the antenna;

    a demodulator configured to demodulate the reflected wave obtained by said non-contact information recording medium modulating a part of the electric wave;

    a calculator configured to calculate a difference in phases between the electric wave and the reflected wave from the non-contact information recording medium; and

    a measuring unit configured to determine that the non-contact information recording medium passes a position closest to the antenna, on the basis of the difference in phases between the electric wave radiated from the antenna and the reflected wave from the non-contact information recording medium calculated by the calculator.

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