| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a non-contact ID system for clearly discriminating the reduction of influence due to interference. <P>SOLUTION: This non-contact ID system is configured of a responder 1 having an unique identifier and a questioner 2 having a transmitting means for outputting a question signal with each predetermined interval to the responder 1 and a receiving means for receiving a response signal including an identifier to be outputted from the responder 1 at the time of receiving the question signal. The questioner 1 is provided with a carrier wave detecting circuit 26 which detects the level of a carrier wave received by the receiving means, a light emitting element 27 and a speaker 28 for announcing the generation of interference and its level and a questioner control circuit 20 for detecting the level of the carrier wave by the carrier wave detecting circuit 26 without making the transmitting means output any question signal in any transmission timing among the transmission timings of the question signal, and for transmitting an announcement command corresponding to the detection level to the announcing means when the detection level exceeds a predetermined threshold. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
