| 摘要 |
<P>PROBLEM TO BE SOLVED: To make a period allowing use of each RFID tag longer than ever before. <P>SOLUTION: A main body 100 of RFID tag 1 includes a pair of substrates 10A and 10B that are equipped with IC chips 11A and 11B and antenna coils 12A and 12B, respectively, and are arranged face to face across a magnetic plate 13. The substrates 10A and 10B have surfaces that include the antenna coils 12A and 12B and that face to an side opposite to a direction facing the magnetic plate 13, and are blocked each other in an electrical manner. When a surface facing the substrate 10A of the tag 1 is allowed to function as a surface for receiving an electromagnetic wave from a reader-writer, presence of magnetic plate 13 prevents magnetic flux G caused at the antenna coil 12A from acting on the substrate 10B, and only the IC chip 11A communicates with the reader-writer. When a frequency of writing in a memory by the IC chip 11A reaches a prescribed value, the tag 1 is turned upside down to actuate the antenna coil 12B and the IC chip 11B. <P>COPYRIGHT: (C)2012,JPO&INPIT |
