| 摘要 |
<P>PROBLEM TO BE SOLVED: To track the position information of a management target of a child or the like even though a cellular phone falls into an incommunicable state without depending upon a GPS function or the like in a position information tracking system using an electronic tag. <P>SOLUTION: An electronic tag system comprises a fixed electronic tag 2 installed in a fixed object 1, an electronic tag 4 for a moving body which records an identification number and has a reader function for generating an electromagnetic wave 6 and a battery, and a reader for terminal electronic tag of a portable communication device terminal 5, wherein the portable communication device terminal 5 has a function for communicating with the electronic tag 4 for a moving body and the portable communication device terminal 5 in a fixed period, and the electronic tag 4 for a moving body generates an electromagnetic wave 6 with an included battery as a power supply and transmits the identification number to the fixed electronic tag 2 when the communication between the portable communication device terminal 5 and the electronic tag 4 for a moving body is lost. <P>COPYRIGHT: (C)2008,JPO&INPIT |
