Article monitoring apparatus and system
AssigneesSensormatic Electronics Corporation, Takachiho Koheki Co., Ltd.
InventorKunihiko Imafuku
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Abstract
A tag has an intelligent function such that when radiation of a burst signal synchronized with a power source frequency from a transmission antenna (20) is detected, it transmits a response burst signal after completion of reception. Then, when a predetermined number of burst signals have been detected, the tag outputs an alarm. Also, an alarm device main body outputs an alarm when a predetermined number of response burst signals have been received. To provide article monitoring apparatus and article monitoring system which determine whether or not an unpaid article is taken out with reliability. According to the present invention, it is possible to provide article monitoring apparatus and article monitoring system which determine whether or not an unpaid article is taken out with reliability.
Claims32
An article monitoring apparatus, attached to an article monitored by an alarm device having a transmission antenna for transmitting radiant energy within a predetermined region and a reception antenna for receiving the radiant energy outputted periodically, by said transmission antenna, said apparatus comprising:
- an antenna which receives the radiant energy from said transmission antenna of said alarm device and transmits radiant energy from said apparatus to said reception antenna;
- alarm output means for outputting an alarm in response to reception of the radiant energy from said antenna;
- and
- control means for emitting radiant energy with similar frequency (in a similar cycle) to that of said received radiant energy from said transmission antenna, in response to reception of said radiant energy by said antenna, and driving said alarm output means when detecting a predetermined number of reception of said radiant energy, within a pre-determine time period.
Dependencies are inferred from the claim text.