| 摘要 |
Antennas 21 generate electromagnetic waves that cause an RFID tag to generate electricity, the RFID tag being provided in a game chip placed on an upper surface of a betting board 4. A plurality of the antennas 21 are provided in association with each bet portion 3 on the betting board 4. Antennas 31 receive a signal from the RFID tag. Each of the antennas 31 is provided in association with the plurality of antennas 21. A set of the plurality of antennas 21 associated with the respective antennas 31 is driven while successively being changed over among the antennas 21, for each set of the antennas 21 associated with each antenna 31. Further, each antenna 31 is driven at least while any of the plurality of antennas 21 associated with this antenna 31 generates electromagnetic waves.
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