JP2010015230A - Security tag, security system, and antenna device - Google Patents

Abstract

<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

Description

  The present invention relates to a security tag attached to an object to be monitored, a security system using the security tag, and an antenna device. More specifically, the present invention relates to monitoring products and assets in a monitoring area such as a store, a warehouse, and an office. The present invention relates to a security tag attached to an object, a security system that monitors the object to be monitored using the security tag, and an antenna device.

Conventionally, in a store or the like, a tag is attached to a product, or a tag is stored in a case for storing a CD, a DVD, etc., and when the product passes between gate devices, the gate device detects the tag and sounds or emits light. Informing the store clerk and the like by detecting an illegal take-out.
Also, in offices and warehouses, a tag is attached to an asset such as a computer, document, product, or material stored in the monitoring area, and if it is illegally taken out of the monitoring area, the gate device detects the tag and rings. Notification operations such as flashing and flashing were performed to detect illegal takeouts and notify asset managers.

In addition, an RFID tag attached to a product displayed in the store, an information reading gate arranged near the store entrance and reading the product ID recorded on the RFID tag, and information communicably connected to the information reading gate There is a system consisting of a processing device.
This information processing apparatus includes a database in which items such as a product ID recorded in an RFID, a product name of a product to which the RFID is attached, a product price, a product arrival date, a product sale date, and a processed flag are recorded. When the RFID tag attached to the product passes through the gate, the gate reads the product ID recorded on the RFID tag and transmits it to the information processing apparatus. Then, the information processing apparatus searches the database for data that matches the product ID. If there is data for the matching product ID, the information processing device determines whether the product is sold or not sold based on the processed flag. If it is in a sales state, an alarm process is executed (see, for example, Patent Document 1).

The RFID tag is classified into an active tag having a power supply unit such as a battery and a passive tag having no power supply unit.
There is also a resonance tag including a resonance circuit as a tag other than the RFID tag. When the resonance tag passes between the gate devices, the gate device performs a ringing operation in response to the resonance frequency output from the resonance circuit. In addition, there is a self-sounding resonance tag that includes a power supply unit such as a battery in the resonance tag and performs a sounding operation when the resonance tag is removed from the object to be monitored.
JP 2005-284671 A

  The RFID tag described in Patent Document 1 is a so-called passive tag that does not include a power supply unit such as a battery, and does not transmit a signal upon receiving power supply from the power supply unit. It was as narrow as about 1 m. Also, the directivity is high, and it may be significantly less than 1 m depending on the direction of the passive tag. For this reason, even if the distance between the gate devices is set to about 1 m, there are not a few cases where the passive tag cannot be detected. Furthermore, since the passive tag does not include the power supply unit as described above, even if the passive tag is illegally removed from the monitoring target, a notification operation such as ringing or light emission cannot be performed.

  On the other hand, an active tag having a power supply unit can communicate within a range of about several tens of meters by receiving power supply from the power supply unit. In addition, the directivity is lower than that of the passive tag, and signals can be transmitted over a wide range. However, because the communication range is wide, when the active tag transmits a signal corresponding to the signal from the gate device, not only the gate device receives the signal but also other gate devices receive the signal. In some cases, a notification operation is performed.

For example, when a gate device is installed on the floor on which the gate device is installed and on the floor one floor above or below the floor, not only the radio signal transmitted on a certain floor is received on the floor, There were quite a few receptions on the first and lower floors.
More specifically, as shown in FIG. 3, when the gate device 3a is installed on the first floor portion of the building and the gate device 3d is installed on the second floor almost above the gate device 3a, the security tag is attached. A signal transmitted from the security tag when a product that has been attached passes through the gate device 3a on the first floor is not only received by the gate device 3a on the first floor, but also on the gate device 3d on the second floor. Could have received.

Furthermore, in the case of a self-sounding resonance tag, when it is detected that the tag has been removed from the object to be monitored, a notification operation by ringing or light emission is performed. There were times when it was flowing, and sometimes it was difficult for the clerk to notice. Similarly, even when the store area is large, it may be difficult to notice the tag notification operation.
In addition, there may be only one worker in a monitoring area such as a warehouse or office. When a self-sounding tag is removed from the monitored object in such a situation, the self-sounding tag Although the notification operation is performed, if there is no other person, it is possible to remove the tag and take out the object to be monitored without being noticed even though an illegal act has been performed.

  In view of the problem, the present invention can more reliably detect a tag attached to a monitoring target, has no interference with other antenna devices, and can securely grasp that the tag has been removed from the monitoring target. It is an object to provide a tag, the security system, and an antenna device.

The security tag according to the present invention is a security tag attached to a monitoring object, and is transmitted from a removal detecting means for detecting removal from the monitoring object and an antenna device installed at a predetermined position. Antenna signal receiving means for receiving an antenna signal, antenna identification information detecting means for detecting antenna identification information for identifying the antenna device or antenna device group that has transmitted the antenna signal from the antenna signal, and the antenna identification information detecting means When the antenna identification information is detected, the broadcast identification data including the antenna identification information is generated, and when the removal detection means detects the removal, the antenna identification information detected by the antenna identification information detection means Broadcast data generation that generates broadcast data that does not contain Receiving means, the power supply from the power supply unit, characterized by comprising a notification data transmitting means for transmitting the broadcast data wirelessly.
Accordingly, an antenna signal including antenna identification information for identifying an antenna device or a group of antenna devices is received and transmitted by including the antenna identification information in the broadcast data. it can. In addition, since the notification data is transmitted even when the removal is detected, it is possible to recognize not only unauthorized take-out but also an unauthorized removal action of the tag.

  Further, the notification data generation means may generate notification data including identification information set in advance as antenna identification information when the removal is detected by the removal detection means.

  In addition, a tag identification information storage unit that stores unique tag identification information for each tag may be provided, and the notification data generation unit may generate notification data including the tag identification information.

Furthermore, the security system according to the present invention includes an antenna device including an antenna signal transmitting unit that transmits an antenna signal including antenna identification information for identifying the security tag and the security tag, and the security tag. It is characterized by comprising receiving means for receiving notification data transmitted from a tag, and identification information detecting means for detecting identification information included in the notification data received by the receiving means.
Therefore, when an antenna signal including antenna identification information for identifying an antenna device is transmitted and this security signal is received by the antenna tag, the antenna identification information is detected from the antenna signal, and broadcast data including the detected antenna identification information is detected. Therefore, the antenna device that has detected unauthorized take-out can be identified based on the antenna identification information included in the broadcast data. Further, when the security tag is illegally removed from the monitored object, the notification data not including the antenna identification information detected by the antenna identification information detecting means is transmitted, so that the security tag is illegally removed based on the notification data. Can also be detected.

  The receiving means may be provided in a receiving device installed in the monitoring area.

  Further, the antenna device is configured to determine whether the receiving means, the identification information included in the broadcast data received by the receiving means, and the antenna identification information set in the antenna device match. And an informing means for informing when the identification information judging means determines that the identification information matches.

The antenna device according to the present invention is transmitted from an antenna signal transmitting means for transmitting an antenna signal including antenna identification information for identifying the security tag attached to the monitored object, and the security tag. Receiving means for receiving a signal; identification information detecting means for detecting identification information contained in the signal received by the receiving means; and notifying means for informing when the identification information is determined to match by the identification information determining means It is characterized by providing.
Therefore, when a signal is received from the security tag in response to the antenna signal transmitted by itself, a notification operation is executed. On the other hand, when a signal from a security tag that has reacted to an antenna signal transmitted from another antenna device is received, the notification operation is not executed. Therefore, the security tag corresponding to its own antenna signal can be detected and notified.

When receiving the antenna signal transmitted from the antenna device, the security tag and the security system according to the present invention detect the antenna identification information from the antenna signal and transmit the notification data including the antenna identification information. Based on the data, it is possible to easily identify the antenna device that has detected unauthorized take-out.
Further, when the security tag is illegally removed from the monitored object, the notification data not including the antenna identification information detected by the antenna identification information detecting means is transmitted, so that the security tag is illegally removed based on the notification data. Can also be detected.
That is, even if the security tag is illegally removed or illegally taken out from the monitoring area, it is possible to determine an illegal act with the same tag based on the antenna identification information included in the notification data. In addition, when taken out illegally, even if a device other than the device that transmitted the antenna signal receives the notification data transmitted corresponding to the antenna signal transmitted from the antenna device, Since it is possible to specify the antenna device that has detected unauthorized take-out, there is no need to consider the output of broadcast data, the position between the antenna devices, and the like.
Further, when the security tag is illegally removed, not only the notification operation but also the notification data is transmitted, so that it is possible to reliably detect that the security tag has been removed even in an environment where the notification operation is not noticed or difficult to notice. .
Furthermore, since the power is supplied from the power supply unit and transmitted, the notification data can be transmitted over a wide range.

  And when removal is detected by the removal detection means, since the preset identification information is included as the antenna identification information, it is illegally removed only by detecting the antenna identification information included in the notification data. It is possible to easily determine at which installation position of the antenna device the unauthorized take-out was performed.

  A tag identification information storage unit that stores unique tag identification information for each tag is included, and since this tag identification information is included in the notification data, a database that associates the tag identification information with the product information is provided in advance. Then, it is possible to easily identify product information that has been stolen or is likely to be stolen. Similarly, if a monitoring area such as an office is provided with a database in which tag identification information and asset information are associated with each other, it is possible to understand which asset is taken out illegally or a tag is removed.

  Since the receiving means for receiving the notification data is provided in the receiving device installed in the monitoring area, the receiving area of the notification data can be freely set by installing a plurality of receiving devices in the monitoring area. In particular, it is possible to more reliably detect unauthorized removal of a security tag by placing it in a place where it is difficult for a person such as a store clerk or a shopper to notice it or in an unattended surveillance area.

  Further, the identification information determination means for determining whether or not the antenna identification information set in the antenna device matches the antenna identification information included in the broadcast data, and the antenna identification information as a determination result matches In this case, since it is provided with notifying means for notifying the theft, the notifying operation can be executed corresponding to only the notification data transmitted based on its own antenna signal.

  As shown in FIG. 1, the security system 1 according to the present invention includes a security tag 2, an antenna device 3, a receiving device 4, and a computer 5.

  In the embodiment described below, a case where a store is a monitoring area and the security tag 2 is attached to a product in the store will be described as an example. However, the monitoring area may be a warehouse, an office, or the like. May be a computer, document, product, material, etc. stored in a monitoring area such as a warehouse or office.

  The security tag (hereinafter referred to as “tag”) 2 is attached to a monitoring object such as a product or a case in which the product is stored, and when it is detected that it has been removed from the monitoring object, either a ringing or a light emission is performed. Alternatively, both of the notification operations are performed, and a fraudulent act is notified to a monitor such as a store clerk or a guard.

Examples of the tag 2 include what are called a wire type, a sticking type, and a case type.
The wire-type tag 2 is mainly composed of a main body portion and a wire portion, and is tethered to an object to be monitored through the wire portion through a hole of a product. And when a wire part is cut | disconnected or a wire part is pulled out from a main-body part, alerting | reporting operation | movement will be performed.
The sticking type tag 2 includes a button that protrudes forward and backward by the urging force of the spring on the main body, the surface provided with the button is brought into contact with the product, and the button is pushed into the main body. To attach to the product. When the tag 2 is removed from the product, the button protrudes from the main body and performs a notification operation. The sticking type tag 2 may be adhered to the product with a tape or the like, or the tag 2 may be attached to the product with a synthetic resin wrap or the like.
The case-type tag 2 is composed of a main body portion provided with a button that protrudes forward and backward by a biasing force of a spring, and a main body portion and a synthetic resin case portion that stores the product, and stores the product in the case portion. By doing so, the button in contact with the product is pushed into the main body, and when the product is taken out from the case, the button protrudes from the main body and performs a notification operation.
The tag in the present invention is not limited to the wire type tag, the sticking type tag, and the case type tag, and may be other types as long as the removal from the monitoring target can be detected.

  As shown in FIG. 1, the tag 2 includes an antenna signal receiving unit 6, an antenna identification information detection unit 7, a tag identification information storage unit 8, a removal detection unit 9, a notification data generation unit 10, a notification data transmission unit 11, and a notification unit. 12 is provided. The tag 2 also includes a power supply unit such as a battery, control means, and the like.

The antenna signal receiving unit 6 receives an antenna signal transmitted from the antenna device 3. The antenna signal receiving unit 6 receives a signal in a predetermined frequency band. The antenna signal also functions as a trigger signal for the tag 2. In response to the antenna signal receiving means 6 receiving the antenna signal, the control means shifts the tag 2 from the sleep state to the activated state.
The antenna signal receiving means 6 may be configured to receive only a signal in a predetermined frequency band, and may be configured not to receive an antenna signal even if a signal other than the frequency band is transmitted.

The sleep state in the present invention is a state in which only removal detection by the removal detection unit 9 and reception of an antenna signal by the antenna signal reception unit 6 can be performed. Broadcast data cannot be generated or transmitted. When the detachment detecting means 9 and the antenna signal receiving means 6 do not require power supply from the power supply unit, the power supply unit is consumed only by natural discharge.
On the other hand, the activated state is a state in which power is supplied from the power supply unit, antenna identification information is detected, and notification data can be generated, transmitted, and notified.

The antenna identification information detecting means 7 detects antenna identification information for identifying the antenna device 3 from the antenna signals received by the antenna signal receiving means 6.
The antenna identification information is identification information stored in the antenna device 3 as will be described later. For example, as shown in FIG. 2, the antenna device 3a installed at the store entrance / exit Ga and the antenna installed at the entrance Gb This is information for identifying which one of the antenna devices 3 of the device 3b and the antenna device 3c installed at the entrance / exit Gc is a signal. As the antenna identification information, different identification information is set for each antenna device 3, but when a plurality of antenna devices 3,..., 3 are installed adjacent to each other, these antenna devices 3,. The same antenna identification information may be installed as one antenna device group.

  The tag identification information storage unit 8 stores tag identification information. The tag identification information may be identification information uniquely set for each tag 2, common identification information may be set for each monitoring area, or common identification information may be set for each store. Also good.

The removal detection means 9 detects that the tag 2 has been removed from a monitored object such as a product. As described above, in the case of the wire type tag 2, it is detected that the wire is cut or pulled out. Further, in the case of the sticking type tag 2, removal is detected by a button that has been pushed into the tag body protruding. The case-type tag 2 detects removal when the product stored in the case part is taken out and the button pushed into the main body part protrudes.
When the removal detection means 9 detects removal, the control means shifts the tag 2 from the sleep state to the activated state.
Note that when the removal detection means 9 does not detect removal, the tag 2 maintains the sleep state.

The notification data generation means 10 reads tag identification information even stored in the tag identification information storage unit 8. When antenna identification information is detected by the antenna identification information detection means 7, notification data including the antenna identification information and the tag identification information is created.
When removal is detected by the removal detection means, notification data including preset removal identification information and the tag identification information is generated.

The removal identification information may be any information as long as it is different from the antenna identification information set in the antenna device 3. For example, removal identification information common to all tags 2 may be set, removal identification information common to each monitoring area may be set, or removal identification information common to each monitoring object may be set. Alternatively, different removal identification information may be set for all the tags 2.
More specifically, when setting the removal identification information common to all the tags 2, “0 (zero)” is set as the removal identification information, and identification information other than “0” is set in advance as the antenna identification information. Set.
Further, when setting the removal identification information for each monitoring area, as shown in FIG. 3, “1” is set in advance as the removal identification information in the tag 2 used in the monitoring area S1 on the first floor. “2” is set in advance as the removal identification information for the tag 2 used in the monitoring area S2 of the floor portion. At this time, information other than the identification numbers “1” and “2” is set as the antenna identification information.
Further, as another example, any one of “10” to “19” is used as the removal identification information of the tag 2 used in the monitoring region S1, and “20” is used as the removal identification information of the tag 2 used in the monitoring region S2. If any one of "29" is set, it is possible to know in which monitoring area the illegal removal has been performed based on the removal identification information.
Furthermore, the identification information stored in the tag identification information storage unit 8 may be removed and used as identification information.
Moreover, it is good also as removal identification information by not setting data to the data area ensured as antenna identification information (for example, setting NULL data).

The notification data transmission unit 11 transmits the notification data generated by the notification data generation unit 10. The notification data may be transmitted only once, but may be transmitted a predetermined number of times (for example, 5 times or 10 times). Further, it may be repeatedly transmitted for a predetermined time (for example, 5 minutes), or may be repeatedly transmitted until it receives notification stop control by a store clerk or the like. When the signal is transmitted a plurality of times, the notification data may be transmitted continuously, or may be transmitted with a predetermined time interval.
The notification data transmitted by the notification data transmitting unit 11 is preferably not strong in directivity, and is preferably transmitted in almost all directions.

The notification unit 12 performs a notification operation with sound or light when the antenna signal is received by the antenna signal reception unit 6 and when removal is detected by the removal detection unit 9. The notification operation may be performed until stop control is performed, or may be continuously performed for a predetermined time (for example, 5 minutes) and then stopped.

Note that when the tag 2 is performing a notification operation, if the store clerk or the like receives a stop control process, the operation state of the tag 2 is changed from the activated state to the sleep state. That is, the power supply from the power supply unit is stopped.
Further, when the product is sold, the tag 2 attached to the product is removed by the store clerk in a proper procedure, so that the notification operation is not performed and the notification data is not transmitted.

Next, the antenna device 3 that transmits an antenna signal to the tag 2 will be described.
The antenna device 3 may be a gate type antenna device 3 as shown in FIG. Further, an antenna unit (not shown) constituting the antenna signal transmission unit 14 may be embedded in a floor, a wall surface, a ceiling, or the like, and the antenna signal may be transmitted from the antenna unit.
When the antenna portion is embedded in a floor, a wall surface, a ceiling, etc., it is possible to make the store excellent in design without impairing the beauty of the store.
On the other hand, in the case of the gate type, it is only necessary to install the gate type antenna device 3 at a predetermined location in the store. Not only the installation work is easier than the embedded type antenna device 3, but also the antenna device The installation position can also be changed, and the installation position of the antenna device 3 can be changed in accordance with the change of the store layout.
Moreover, the antenna part which comprises the antenna signal transmission means 14 may be provided in a mat | matte, the said mat | matte may be installed in an exit, and an antenna signal may be transmitted to the tag 2 which passed the exit.

  The antenna device 3 includes an antenna identification information storage unit 13 and an antenna signal transmission unit 14. When the antenna device 3 receives the notification data transmitted from the tag 2, the antenna device 3 may include a reception unit 15, an identification information determination unit 16, a notification unit 17, and a transmission unit 18.

The antenna identification information storage unit 13 stores antenna identification information for identifying the antenna device 3 or the antenna device group. For example, as shown in FIG. 2, when a pair of antenna devices 3a, 3b, 3c are installed at three entrances Ga, Gb, Gc, respectively, the antenna devices 3a, 3b, 3c Antenna identification information “a”, “b”, and “c” are stored in each.
Further, when the tag 2 passing through the entrance / exit G is detected by a plurality of antenna devices 3,..., 3 having a wide entrance / exit G, the same antenna identification information may be set for the plurality of antenna devices 3,. For example, when the transmittable range of the antenna signal of one antenna device 3 is 2 m, it is necessary to install two or more antenna devices 3 in order to cover a 3 m wide entrance. In such a case, the same antenna identification information may be installed in a plurality of antenna devices 3 installed at one doorway, or different antenna identification information may be set for each.

  The antenna signal transmission unit 14 reads out its own antenna identification information stored in the antenna identification information storage unit 13 and transmits an antenna signal including the antenna identification information. The antenna signal may be transmitted continuously, or may be transmitted at predetermined time intervals (for example, 0.5 seconds or 1 second). When transmitting an antenna signal every predetermined time interval, it is more preferable to shorten the time interval because the probability of receiving the antenna signal when the tag 2 passes through the entrance / exit G can be increased.

  The receiving means 15 receives the notification data transmitted from the tag 2.

  The identification information determination means 16 determines whether or not the identification information included in the received notification data matches the antenna identification information stored in its own antenna identification information storage unit 13.

  The notification unit 17 performs a notification operation using sound or light when the antenna identification information set in the identification information determination unit 16 matches the identification information included in the notification data.

When the receiving unit 15 receives the notification data, the transmission unit 18 adds receiving device identification information set in advance to the antenna device 3 to the notification data, and transmits this data to the computer 5 by wire or wirelessly.
The transmission means 18 is transmitted when the tag 2 is removed from the product near the antenna device 3 by transmitting the notification data to the computer 5 even if the notification data does not include its own antenna identification information. Broadcast data is received and transmitted to the computer 5.

  The receiving device 4 includes receiving means 19. In addition, a receiving device identification information storage unit (not shown) for storing receiving device identification information for identifying the receiving device 4 is provided, and the receiving device identification information is added to the received notification data, and this data is transmitted by wire or wirelessly. Send to computer 5.

The computer 5 includes an input unit 20, an identification information detection unit 21, a notification unit 22, and the like.
The input unit 20 inputs notification data transmitted from the receiving device 4 and notification data transmitted from the antenna device 3.

The identification information detection means 21 detects antenna identification information and removal identification information from the notification data input by the input means 20. Further, the receiving device identification information added to the broadcast data is detected.
Depending on whether or not the antenna identification information is included in the notification data, whether the tag 2 has passed through the place where the antenna device 3 is installed and the notification data is transmitted, the tag 2 is removed from the monitoring object and notified. It is possible to determine whether data has been transmitted. Further, the receiving device 4 that has received the notification data can be identified based on the receiving device identification information added to the notification data input to the computer 5. That is, it is possible to estimate the position of the tag 2 that is transmitting the notification data.

  The notification means 22 displays on the display unit connected to the computer 5 that an act that seems to be stolen has occurred, or notifies the mobile terminal possessed by a store clerk that an act that seems to be stolen has occurred.

  Further, when the tag identification information stored in the tag identification information storage unit 8 is different for each tag 2, the tag identification information is associated with product information such as a product name and product ID. May be provided in the computer 5 so that a product for which an illegal act has been performed can be specified based on the tag identification information when an illegal take-out or removal occurs.

  Next, processing of the tag 2, the antenna device 3, the receiving device 4, and the computer 5 in the security system 1 will be described based on FIGS.

First, the processing of the tag 2 will be described based on the flowchart of FIG.
Tag 2 is waiting in the sleep state. Then, it is determined whether or not the object is removed from the monitoring object. If it is removed, the process proceeds to step 2 (S2), and if not removed, the process proceeds to step 3 (S3).
When the tag 2 is removed from the monitoring object, the tag 2 is shifted from the sleep state to the activated state, and receives power supply from the power supply unit (S2). And the process after step 6 (S6) is performed (S1). If not removed, it is determined whether the antenna signal receiving means 6 has received an antenna signal transmitted from the antenna device 3 (S3). When the antenna signal is not received, the process proceeds to step 1 (S1) and the sleep state is maintained. When the antenna signal is received, the tag 2 is shifted from the sleep state to the activated state, and receives power supply from the power supply unit (S4). Then, the antenna identification information included in the transmitted antenna signal is detected (S5), and the process proceeds to step 6 (S6).
Further, the notification data generation means 10 reads the tag identification information stored in the tag identification information storage unit 8 (S6), and generates notification data (S7). At this time, the broadcast data when the antenna signal is received includes the antenna identification information in the broadcast data.
The notification data transmission unit 11 transmits the generated notification data (S8), and executes a notification operation by ringing or light emission.

Next, the processing of the antenna device 3 will be described based on the flowchart of FIG.
In parallel with the processing of the flowchart of FIG. 5, the antenna device 3 transmits an antenna signal including antenna identification information continuously or at predetermined intervals. Therefore, when the tag 2 enters the antenna signal transmission area of the antenna device 3, the tag 2 receives the antenna signal and transmits notification data.

The receiving unit 15 of the antenna device 3 transmits an antenna signal and determines whether or not the notification data transmitted from the tag 2 is received. If the notification data is received, the process proceeds to step 12 (S12). When the notification data is not received, the process is repeated until reception of the notification data is received (S11).
And if the receiving means 15 receives alerting | reporting data, the receiver identification information preset to the antenna apparatus 3 will be added to the received alerting | reporting data (S12). The transmission means 18 transmits the notification data to which the receiving device identification information is added to the computer 5 (S13).
Further, the identification information determination means 16 determines whether or not the antenna identification information included in the received notification data matches its own antenna identification information (S14). S15) If not matched, the process is terminated.
That is, a notification operation is performed when notification data transmitted by the tag 2 that has received its own antenna signal is received. Further, all the notification data received by the receiving means 15 is transmitted to the computer 5 and the computer 5 performs data processing.

  When receiving the notification data, the reception device 4 adds the reception device identification information preset in the reception device 4 to the received notification data, and transmits the received notification data to the computer 5.

  As shown in FIG. 6, the computer 5 inputs the notification data transmitted from the receiving device 4 or the antenna device 3 (S21). The notification data input by the input means 20 determines whether or not the antenna identification information exists in the notification data (S22). If the antenna identification information does not exist, the receiving device identification information included in the broadcast data is detected (S23). And based on the said antenna identification information or receiving device identification information, the position of the tag 2 which transmitted alerting | reporting data is estimated, and the notification operation | movement to a salesclerk etc. is performed (S25).

  Next, the estimation of the position of the tag 2 that has transmitted the notification data will be described with reference to FIG. In FIG. 2, a tag 2 is attached to a commodity that is a monitoring target displayed in a store as the monitoring target area S <b> 1. The store is provided with three entrances Ga, Gb, and Gc, and a pair of gate-type antenna devices 3a, 3b, and 3c is installed at each entrance. That is, the product cannot be taken out of the store unless it passes between the pair of antenna devices 3 installed at the three entrances Ga to Gc. Further, the antenna signal is output between the pair of antenna devices 3.

  For example, when the antenna identification information of the antenna device (gate device) 3a is included in the notification data, it can be determined that the tag 2 has transmitted the notification data by passing between the antenna devices 3a. As described above, when the antenna identification information exists in the notification data, it can be understood that an illegal act such as taking out is performed at the position of the antenna device 3 corresponding to the antenna identification information. Similarly, when a tag passes between other antenna devices 3, it is possible to specify at which doorway an illegal take-out has occurred based on the respective antenna identification information.

  On the other hand, when the antenna identification information does not exist in the notification data, it is when the tag 2 is removed from the monitoring object in the monitoring area S1 such as a store, and the tag 2 is removed based on the receiving device identification information. Estimated position. For example, when the tag 2 is removed at the X1 point in the store, the tag 2 transmits the notification data in an area where the reception area 24b of the reception apparatus 4b and the reception area 24c of the reception apparatus 4c overlap each other. Then, only the receiving device 4b and the receiving device 4c receive this notification data, add its own receiving device identification information to the received notification data, and transmit it to the computer 5. Since there is no antenna identification information in the notification data, the computer 5 determines that the tag 2 has been removed, and further receives the notification data in the reception device 4b and the reception device 4c, so that the reception region 24b and the reception region 24c overlap. It can be seen that unauthorized removal was performed within the area. Similarly, when the tag 2 is removed at the X2 point, only the receiving device 4a receives the signal. Therefore, an unauthorized removal action is performed in an area that does not overlap with other receiving areas in the receiving area 24a of the receiving apparatus 4a. I understand that.

  Note that the receiving means 19 of the receiving device 4 and the receiving means 15 of the antenna device 3 are provided with a reception strength measuring unit (not shown) for measuring the reception strength of the notification data, and this reception strength information is also added to the notification data. Then, it may be transmitted to the computer 5. In this case, the distance between the tag 2 that transmitted the notification data and the receiving device 4 can also be estimated based on the received intensity, and the position of the tag 2 can be estimated more accurately.

  Further, the antenna device 3 determines whether or not the antenna identification information included in the notification data received by the identification information determination unit 16 matches its own antenna identification information, and only the antenna device whose antenna identification information matches. Performs the notification operation. For example, when the reception areas 23a and 23b of the notification data overlap each other as in the antenna device 3a and the antenna device 3b, the tag 2 corresponds to the antenna signal from the antenna device 3b. When transmitting the notification data, the antenna device 3a does not execute the notification operation, and only the antenna device 3b executes the notification operation. Thus, even if the antenna device 3 is installed close to the antenna device 3, it is possible to easily identify the antenna device 3 that has detected an unauthorized take-out action.

  Furthermore, an imaging means (not shown) such as a monitoring camera capable of changing the imaging area may be installed in the store, and the imaging area may be switched based on a control signal from the computer 5. At this time, as described above, the photographing unit may be controlled based on the information on the position of the tag 2 estimated based on the notification data.

  Next, the case where the security system 1 of the present invention is installed in a store adjacent on the upper and lower floors will be described with reference to FIG. As shown in FIG. 2, the store on the first floor has a pair of antenna devices 3a, 3b, and 3c at the three entrances, and the store on this floor is defined as one monitoring area S1. Five receiving devices 4 are installed at predetermined positions in the monitoring area S1.

  In the store on the second floor, a pair of antenna devices 3d are installed at one entrance, and the store on the second floor is set as one monitoring area S2. In addition, the second-floor antenna device 3d is installed substantially above the first-floor antenna device 3a, and four receiving devices 4f, 4g, and 4i are installed at predetermined positions in the monitoring area S2.

Unlike the present invention, in the case of a system in which the antenna device performs a notification operation or the computer 5 performs a notification operation when the notification data transmitted from the tag 2 is received regardless of the antenna identification information, 1 When the tag 2 passes between the antenna devices 3a in the floor portion, the tag 2 transmits notification data corresponding to the antenna signal of the antenna device 3a. This notification data is not only received by the antenna device 3a but also received by the antenna device 3b installed in the vicinity on the same floor and the antenna device 3d installed above the antenna device 3a. The notification operation is also executed in the device 3d.
That is, not only the 1st floor part detects fraudulent acts performed on the 1st floor part, but also the 2nd floor part. In particular, when a notification operation is executed in the second floor device due to an illegal take-out that has occurred in the first floor portion, the person who has passed through the gate device 3d in the second floor portion may feel uncomfortable, Sometimes 3d seems to have failed. In this way, the notification data is transmitted and received over the upper and lower floors, in addition to passing through the floor material or the like, the notification data may be transmitted using spaces such as stairs and escalators.

  However, as in the present invention, the antenna signal transmitted from the antenna device 3 includes its own antenna identification information, and the tag 2 that has received the antenna transmits notification data including the antenna identification information. It can be clarified in which antenna device 3 an illegal take-out has occurred, and even if an illegal take-out occurs on the first floor portion, the gate device 3d on the second floor does not perform an incorrect notification operation.

As shown in FIG. 3, when the removal identification information is the same in the monitoring area S1 and the monitoring area S2, notification data is transmitted from the tag 2 when unauthorized removal is performed in the monitoring area S2. This notification data is received not only by the receiving devices 4f to 4i in the monitoring area S2 on the second floor, but also received by the receiving devices 4a to 4e in the monitoring area S1 on the first floor. It was difficult to identify whether unauthorized removal occurred. In particular, when the receiving device 4 is installed on the ceiling, since the distance between the floor on the second floor and the ceiling on the first floor is short, the receiving device 4 on the first floor receives the notification data transmitted from the second floor. There was often to do.
However, if the removal identification information is set in the tag 2 for each monitoring area S, even if the tag 2 is illegally removed from the monitoring object, unauthorized removal has occurred in any monitoring area S based on the removal identification information. It is easy to understand.

In addition, when the tag 2 is removed from the monitoring object, not only the notification operation is performed but also notification data is transmitted. For example, the environment in which announcements and music are output at a large volume, and the store area are large. Even in an environment where it is difficult to notice the notification operation of the tag 2 as in the wide case, it is possible to reliably detect that unauthorized removal has occurred by transmitting the notification data.
Furthermore, if the tag 2 is illegally removed in a situation where there is only one worker in a monitoring area such as an office or warehouse, it is not known that the tag has been illegally removed when only the notification operation is performed. By transmitting the notification data as in the present invention, it can be seen that the tag has been illegally removed.

  In FIG. 3, one monitoring area S is set for each floor, but a plurality of monitoring areas S may be set for one floor.

It is a block diagram of a security tag and a security system. It is explanatory drawing about a monitoring area | region. It is explanatory drawing when the monitoring area | region is provided in the 1st floor and the 2nd floor. It is an operation | movement flowchart of a security tag. It is an operation | movement flowchart of an antenna apparatus. It is an operation | movement flowchart of a computer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Security system 2 Security tag 3 Antenna apparatus 4 Receiving device 5 Computer 6 Antenna signal receiving means 7 Antenna identification information detection means 8 Tag identification information storage part 9 Detachment detection means 10 Notification data generation means 11 Notification data transmission means 12 Notification means 13 Antenna Identification information storage unit 14 Antenna signal transmission means 15 Reception means 16 Identification information determination means 17 Notification means 18 Transmission means 19 Reception means 20 Input means 21 Identification information detection means 22 Notification means 23 Reception area 24 Reception area G Entrance / exit S Monitoring area

Claims (7)

A security tag attached to a monitoring object,
Detachment detection means for detecting removal from the monitoring object;
An antenna signal receiving means for receiving an antenna signal transmitted from an antenna device installed at a predetermined position;
Antenna identification information detecting means for detecting antenna identification information for identifying the antenna device or antenna device group that has transmitted the antenna signal from the antenna signal;
When antenna identification information is detected by the antenna identification information detection means, notification data including the antenna identification information is generated, and when removal is detected by the removal detection means, the antenna identification information detection means Broadcast data generating means for generating broadcast data not including the detected antenna identification information;
A security tag comprising: notification data transmitting means for receiving power supplied from a power supply unit and transmitting the notification data wirelessly.   The security tag according to claim 1, wherein the notification data generation unit generates notification data including identification information set in advance as antenna identification information when removal is detected by the removal detection unit. A tag identification information storage unit that stores unique tag identification information for each tag,
The security tag according to claim 1 or 2, wherein the notification data generation means generates notification data including the tag identification information. A security tag according to any one of claims 1 to 3,
An antenna device comprising an antenna signal transmitting means for transmitting an antenna signal including antenna identification information for identifying the security tag;
Receiving means for receiving notification data transmitted from the security tag;
A security system comprising: identification information detecting means for detecting identification information included in the notification data received by the receiving means.   The security system according to claim 4, wherein the receiving unit is provided in a receiving device installed in a monitoring area. The antenna device is
The receiving means;
Identification information determination means for determining whether or not the identification information included in the notification data received by the reception means matches the antenna identification information set in itself;
6. The security system according to claim 4 or 5, further comprising notification means for notifying when the identification information determination means determines that the identification information matches. An antenna signal transmitting means for transmitting an antenna signal including antenna identification information for identifying the security tag attached to the monitored object;
Receiving means for receiving a signal transmitted from the security tag;
Identification information detecting means for detecting identification information included in the signal received by the receiving means;
An antenna device comprising: an informing means for informing when the identification information is judged to match by the identification information judging means.

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