| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reader/writer for a wireless tag, capable of solving the problem of radio waves from a wireless tag cannot be received any longer, by being affected by the interference of radio waves emitted from respective reader/writers, without having to narrow the communication area of the reader/writer, when a plurality of reader/writers exist in the communicable area. <P>SOLUTION: The reader/writer for a wireless tag for communication with a wireless tag by radio is provided with a receiving circuit 103 for receiving signals of reader/writers other than a self-reader/writer 100 and a signal detection circuit 104 of the other reader/writers. The self-reader/writer 100 has a reader/writer control circuit 105 for making the self-reader/writer 100 go into the operation mode of the wireless tag, when the signal detection circuit 104 of the other reader/writers detects a signal of the reader/writers other than the self-reader/writer 100 and for making the self-reader/writer 100 start the operation mode of a normal reader/writer, when the signal detection circuit 104 does not detect the signal of the reader/writers, other than the self-reader/writer 100. <P>COPYRIGHT: (C)2007,JPO&INPIT |
