| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a user to suitably data stored in an RFID while preventing a circuit in a reader from becoming complicated. <P>SOLUTION: This RFID 3a includes an antenna resonance circuit 31a; a data transmission part 332 for trasmitting data to a reader 2a by using the antenna resonance circuit 31a; a data reception part 331 for receiving the data from the reader 2a by using the antenna resonance circuit 31a; and a resonance characteristic control part 333a for controlling the resonance characteristics of the antenna resonance circuit 31a when any prescribed data are not received by the data reception circuit 331 within a prescribed time after the transmission of data by the data transmission part 332. Thus, it is possible to change the amplitude of a superimposed wave according to the on/off of a load changeover switch in the antenna resonance circuit 31a. Therefore, a reader 2a can suitably read the data stored in an RFID 3a while preventing the circuit in the reader 2a from becoming complicated. <P>COPYRIGHT: (C)2010,JPO&INPIT |
