| 摘要 |
<p>PURPOSE:To achieve an improvement in ease of handling and moreover, an expansion of the form of utilization by increasing the freedom in the selection of a location of mounting an electronic type tag on an object and the location of setting a loop antenna. CONSTITUTION:An individual identification number intrinsic to an electronic type tag is transmitted to interrogators 13a-13n through a network circuit 12 from a center device 11 and after received with the interrogators 13a-13n, it is transmitted as radio wave through loop antennas 14a-14n. Receiving the radio wave, the electronic type tags 15a-15n involved transmit an existence affirmative signal as radio wave. The interrogator alone receiving the signal transmits his own position identification number to the center device 11. The center device 11 receives the number to recognize the position of an object.</p> |
