| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a security tag, a security system, and an antenna device for surely detecting a tag mounted on a monitoring object, and for eliminating any interference with another antenna device, and for surely recognizing that the tag has been removed from the monitoring object. <P>SOLUTION: This security tag includes: a removal detection means 9 for detecting that the tag has been removed from a monitoring object; an antenna signal reception means 6 for receiving an antenna signal transmitted from an antenna device 3; an antenna identification information detection means 7 for detecting antenna identification information from the antenna signal; a notification data generation means 10 for, when the antenna identification information is detected, generating notification data including the antenna identification information. and for, when removal is detected, generating the notification data excluding the antenna identification information; and a notification data transmission means 11 for transmitting the notification data by radio. <P>COPYRIGHT: (C)2010,JPO&INPIT |
