| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable to stably read out and add information from and to a resonance tag (RF tag) that is less expensive than a non-contact RF tag containing LSI. <P>SOLUTION: A read method for RF tag information is provided with at least two or more pairs of electromagnetic wave resonance circuits U having a different resonance frequency each other, which include at least either of a resistor or a capacitor, a fuse or antifuse element that can select a low impedance state or a high impedance state through an electric signal, and a coil antenna. In the read method for RF tag information, the frequency of a read electromagnetic wave radiated from a reading means is continuously or intermittently swept, and a plurality of reflect waves that correspond to resonance frequencies of the plurality of electromagnetic wave resonance circuits are received. In addition, relative relations between frequencies of the plurality of reflect waves or relative relations between frequencies of absorption waves introduced from the reflect wave frequencies are detected to read out information. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
