| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform a position detection without following a large increase in costs even if an object area for the position detection is increased when acquiring a unique coil ID of a trigger coil with a radio tag to perform the position detection of the radio tag on the basis of the acquired coil ID.SOLUTION: A coil part 2a to be arranged in an X-axis direction is connected to trigger transmitters 3(X1), 3(X2) and 3(X3) in arrangement order of the trigger transmitter. A coil part 2a to be arranged in a Y-axis direction is connected to trigger transmitters 3(Y1), 3(Y2) and 3(Y3) in arrangement order thereof. From a switch-over pattern of a trigger ID of a trigger coil 2 to be detected by a radio tag 1, a movement pattern can be identified that shows in which direction the radio tag 1 moves. Specifically, since a current position of the radio tag 1 can be computed from a pre-movement position of the radio tag 1 and the movement pattern thereof, a post-movement position of the radio tag 1 can be computed by preliminarily detecting an initial position of the radio tag 1.</p> |
