| 摘要 |
PROBLEM TO BE SOLVED: To provide an access method for a transponder by which a plurality of transponder that can be manufactured at a low cost and use a plurality of electromagnetic waves can be accessed nearly at the same time, to provide a transponder reader and a transponder system. SOLUTION: In this transponder access method, a system using a plurality of transponder TP-1 to TP-n using a frequency of a 135 kHz band, and using a transponder reader is configured. Furthermore, times (t1-tn) until the transmission of a response signal is started after a 30ms questionnaire signal is received by each of the plurality of the transponders TP-1 to TP-n are set at random within 35ms-295ms. After the transponder reader TRD transmits a questionnaire signal once, the transponder reader TRD maintains a reception state for at least 300ms to receive a response signal. |
