| 摘要 |
<P>PROBLEM TO BE SOLVED: To make a reader compact when it is not used and improve the estimating accuracy of a radio tag position when searching. <P>SOLUTION: The radio tag reader 1 has a control circuit 202 for generating access information for accessing the radio tag information of the IC circuit unit 150 of a radio tag circuit element (To) attached to an object, a transmission antenna 10 for transmitting the access information to the antenna 151 of the radio tag circuit element (To) to perform access, and an antenna 3 provided with reception antennas 11A, 11B each receiving a response signal corresponding to this transmission. The reception antennas 11A, 11B are connected to each other so that a distance (d) between them can be expanded/retracted. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
