| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio tag system etc. capable of unfailingly acquiring information for identifying radio tags in an area where radio waves do not reach, including radio tags existing in an area where radio waves reach. <P>SOLUTION: The radio tag system S is provided with: a plurality of radio tags 10, 10a storing unique identification information; and a radio tag reader 5 capable of performing communication with the radio tags 10, 10a via radio waves. In the radio tag system S, the radio tag reader 5 is provided with a signal transmission means for transmitting a predetermined signal, and the radio tags 10, 10a are provided with a first information transmission control means for transmitting a radio wave including the identification information of itself based on the signal, an identification information receiving means for receiving identification information transmitted from the other radio tag according to the signal, and a second information transmission control means for transmitting a radio wave obtained by adding its own identification information to the identification information received from the other radio tag. <P>COPYRIGHT: (C)2009,JPO&INPIT |
