Reader/writer and article sorting system
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
78 Citations
14 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for reading and writing information from and onto a non-contact information recording medium using an electric wave, the method comprising:
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radiating the electric wave and receiving a reflected wave modulated by said non-contact information recording medium; transmitting the electric wave to the non-contact information recording medium via the antenna; demodulating the reflected wave modulated by said non-contact information recording medium modulating a part of the electric wave; calculating a difference in phases between the electric wave and the reflected wave from the non-contact information recording medium; and determining that the non-contact information recording medium passes a position closest to the antenna, on the basis of the calculated difference in phases between the electric wave radiated from the antenna and the reflected wave from the non-contact information recording medium.
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Specification