| 摘要 |
A system that reads and writes information from and onto a non-contact information recording medium using an electric wave includes a reader/writer and a measuring unit. The reader/writer includes an antenna configured to transmit an electric wave onto the non-contact information recording medium, a demodulator configured to demodulate a reflected wave obtained by the non-contact information recording medium modulating a part of the electric wave, and a calculator configured to obtain a delay time of the reflected wave. The measuring unit measures a difference in delay times calculated by the calculator, and obtains a change in a distance between the antenna mediating transmission/reception of the electric wave and the non-contact information recording medium.
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