| 摘要 |
PCT No. PCT/JP93/00200 Sec. 371 Date Oct. 15, 1993 Sec. 102(e) Date Oct. 15, 1993 PCT Filed Feb. 18, 1993 PCT Pub. No. WO93/16444 PCT Pub. Date Aug. 19, 1993A data carrier system which uses a power sourceless electromagnetically coupled data carrier, wherein two-way data communication is made possible between a fixed facility and a data carrier. Provision is made for a synchronizing means which renders the frequencies and phases of AC magnetic fields emitted from the fixed facilities to be the same among a plurality of fixed facilities, such that interference will not take place among the plurality of fixed facilities even when they are arranged close to one another. Moreover, the electric power induced in the antenna of the fixed facility by the AC magnetic field generated from the data carrier is synchronously detected by using a synchronizing signal controlled by said synchronizing means.
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