JP3197263U - Anti-theft tag and anti-theft system - Google Patents

Abstract

An anti-theft tag in which a comparator can be used to improve reception sensitivity and a theft prevention system in which a transmission antenna is miniaturized are provided. An alarm issuing unit capable of issuing an alarm signal, a trigger signal receiving unit for detecting a trigger signal transmitted from the outside, and an alarm issuing when the trigger signal receiving unit detects a trigger signal. A trigger signal receiving unit 124 that receives the trigger signal, and a signal indicating that the tag receiving antenna 126 has received the trigger signal. The tag control unit 140 includes a comparator power supply control unit 143 that controls the power supplied to the comparator 127 to intermittently operate the comparator 127. [Selection] Figure 1

Description

  The present invention relates to anti-theft tag technology.

  Conventionally, as a theft prevention system, there is one described in Patent Document 1, for example. This anti-theft system is composed of a self-sounding sensor tag (theft-preventing tag) which is a detection tool for anti-theft and a transmission / reception antenna that is separate from the self-sounding sensor tag. Comprises a theft detection means for detecting a preliminary act of theft, and an alarm sound output means for outputting an alarm sound when the theft detection means detects a preliminary act of theft, and the transmission / reception antenna is generated by the alarm sound output means An alarm operation detecting means for detecting electromagnetic noise and an auxiliary alarm output means for outputting an alarm signal when the alarm operation detecting means detects electromagnetic noise. The theft detection means detects that the theft preparatory action has occurred when the receiving means receives the operation instruction signal wirelessly transmitted from the transmitter of the transmission / reception antenna.

  In general, the anti-theft tag is provided with a receiving circuit for receiving an electric signal from the outside. For example, the one described in Patent Document 2 is transmitted from a transmitting device installed at a store entrance. When a predetermined signal is received, a resonance circuit including a resistor, a capacitor, and a coil resonates, and the transistor is input by driving the transistor with this resonance voltage.

  Furthermore, as what adjusts the reception sensitivity of a theft prevention tag, there exists a thing described in patent document 3, for example. Here, the reception signal input from the antenna is amplified in the signal amplification section, and the radio wave reception sensitivity is adjusted by adjusting the bias voltage of the transistor of the input circuit.

  The abnormality detection device described in Patent Document 4 includes frequency analysis means for obtaining a frequency component of a sound feature included in an alarm sound to be detected by frequency analysis, and frequency component of the sound feature in a sound feature period output from the frequency analysis means. Similarity detection means for obtaining a similarity between a time change pattern indicating time change and a time change pattern in a period before the sound feature period is provided, and an alarm sound is detected from the output level of the similarity detection means.

Japanese Patent No. 3138429 Patent No. 3099107 JP 2000-348270 A Japanese Patent No. 5499927

  Conventional antitheft tags generally have a configuration in which the output of a resonance circuit (receiving antenna) is received by a transistor. Further, in order to suppress the consumption of the battery current of the power supply, the microcomputer is normally kept in the sleep state. When the resonant circuit receives the radio signal, the microcomputer circuit receives an output from the resonant circuit and interrupts the CPU. The CPU analyzes the received signal from the resonant circuit and the received signal is a command code. Control according to the code, for example, control such as issuing an alarm sound.

  In this configuration, the transistor has an operating current of 1 μA or less in order to suppress its current consumption, and the current amplification factor of the transistor is low in the operating region, so that the reception sensitivity of the reception antenna of the antitheft tag is low. was there.

  Some detection circuits in general telecommunication equipment use a comparator to improve sensitivity. The signal detection level of the comparator is more than 100 times more sensitive than the signal detection level of a normal transistor. However, in normal use, the current consumption of the comparator is 10 times higher than that of the transistor, and the current consumption of the battery is lower. growing. The battery installed in the anti-theft tag has a limited capacity, and it is difficult to secure the current consumption of the comparator for a long time with this battery. To increase the sensitivity of the anti-theft tag, the comparator can be used as an anti-theft tag. It could not be installed.

  As described above, the anti-theft tag using a transistor in the input circuit has low reception sensitivity of the radio signal at the receiving antenna, so that the radio signal (trigger signal) can reach the anti-theft tag at a receivable signal level. Even if the electric field intensity of the antenna output is increased within the allowable range of the Radio Law, a large antenna having a size of about 40 cm (width) * 1 m (height) is required for the transmission antenna.

However, a large antenna placed near the entrance of a store may be an obstructive factor for aesthetics, and may impair the image at high-end stores.
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and aims to provide an anti-theft tag that can employ a comparator with high reception sensitivity to improve reception sensitivity and an anti-theft system that realizes downsizing of a transmission antenna. To do.

  In order to solve the above problems, the anti-theft tag of the present invention comprises an alarm notification unit capable of issuing an alarm signal, a trigger signal receiving unit for detecting a trigger signal transmitted from the outside, and a trigger signal receiving unit. It has a tag control unit that controls the alarm signal issuing unit when the trigger signal is detected, and issues the alarm signal. The trigger signal receiving unit receives the trigger signal and the tag receiving antenna receives the trigger signal. It has a comparator that transmits a signal indicating that it has been performed to the tag control unit, and the tag control unit includes a comparator power supply control unit that controls the power supplied to the comparator to intermittently operate the comparator. To do.

  In the anti-theft tag of the present invention, the tag control unit has a sensitivity adjustment unit that changes the comparison threshold voltage input to the comparator and sets the sensitivity of the trigger signal receiving unit.

The anti-theft system of the present invention includes the anti-theft tag and a trigger signal transmitting unit that transmits a trigger signal in the vicinity of the entrance / exit of the anti-theft area.
The anti-theft system of the present invention is the anti-theft tag described above, and is attached to an object placed in the anti-theft alarm area, and the first alarm sound and the second alarm sound are used as an alarm signal when a theft event occurs. An anti-theft tag that reports one of two different sounds, a trigger signal transmitter that transmits a trigger signal near the entrance / exit of the anti-theft alarm area, and at least one alarm among alarm sounds that the anti-theft tag reports An anti-theft tag that has an alarm sound identification unit that identifies sound, and has an alarm reporting unit that can issue a first alarm sound and a second alarm sound, and an abnormality that causes an electric circuit to open and close due to theft A theft detection unit having a situation detection switch unit and a trigger signal receiving unit that detects the trigger signal transmitted from the trigger signal transmission unit, and controls the alarm reporting unit to It has a tag control unit that issues a first alarm sound when the situation detection switch unit is activated and a second alarm sound when the trigger signal receiving unit detects a trigger signal. It is characterized in that an alarm sound that can be identified is recognized among alarm sounds issued by the prevention tag to detect that a theft event has occurred.

  As described above, according to the present invention, by setting the comparator in an intermittent operation state, the average current consumption of the comparator is reduced and the power consumption is suppressed, so that the battery can be used for a long period of time. Therefore, it is possible to use a comparator in the anti-theft tag, and the trigger signal reception sensitivity is improved by using the comparator. As a result, it is possible to reduce the size of the transmission antenna that transmits the trigger signal, and it is possible to suppress the factor that impairs the beauty of the vicinity of the entrance / exit in a luxury goods store or the like.

  The anti-theft tag changes the sensitivity of receiving trigger signals by adjusting the sensitivity, so the reception sensitivity can be adjusted according to the size of the take-out warning range set near the entrance / exit of the anti-theft alarm area. The sensitivity can be increased, and the area where the anti-theft tag issues the second alarm can be expanded.

  Conversely, when exhibiting products near the store entrance / exit where the transmission antenna of the trigger signal transmission unit is installed, if it is a normal sensitivity anti-theft tag, it receives the trigger signal of the transmission antenna and issues a notification in the installed state. Therefore, in the case where the anti-theft tag cannot be attached to the product, it may be possible to attach the anti-theft tag to the product by setting the sensitivity of the anti-theft tag low. Alternatively, malfunction due to electromagnetic noise emitted from a lighting device, an electric device, a power supply line, or the like can be prevented.

  The anti-theft tag issues an alarm sound with different sound characteristics depending on the location where the theft event occurred, so if the anti-theft tag reaches an abnormal state that informs the occurrence of the theft event by issuing an alarm sound, When the alarm sound is triggered, it can be determined that the location of the theft event is inside the burglar alert area. It can be judged that there is, and prompt action of the security officer after the report can be promoted.

The block diagram which shows the structure of the antitheft tag in embodiment of this invention The schematic diagram which shows the structure which combined the alarm sound identification part in the same embodiment, the trigger signal transmission part, and the transmission antenna integrally The block diagram which shows the principal part of the same trigger signal transmission section The block diagram which shows the principal part of the same alarm sound identification section Schematic diagram showing the anti-theft system in the same embodiment Schematic diagram showing the configuration of the first alarm sound in the same embodiment Schematic diagram showing the configuration of the second alarm sound in the same embodiment Schematic diagram showing the period of active state and sleep state of the anti-theft tag and the output period of the transmitting antenna in the same embodiment The schematic diagram which shows the relationship between the reachable range of the output signal of a transmitting antenna and the tag arrangement | positioning possible range in the same embodiment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 5, the anti-theft system is attached to an object placed inside the anti-theft alarm area A, and one of two sounds with different first and second alarm sounds when a theft event occurs. Anti-theft tag 100, trigger signal transmitting unit 200 for transmitting a trigger signal in the vicinity of the entrance / exit of anti-theft alarm area A, and an alarm for identifying the first alarm sound and the second alarm sound that the anti-theft tag reports A sound identification unit 300 (301, 302) is provided.

  In the present invention, the entrance / exit of the burglar alarm area A is not only an entrance / exit that leads from the inside of the store to the outside, but also an area that can be directly entered / exited from the sales area in the store that is the burglar alarm area A, For example, it includes an entrance to a toilet facility.

As shown in FIG. 1, the anti-theft tag 100 includes an alarm notification unit 110, a theft event detection unit 120, a sensitivity adjustment unit 130, a tag control unit 140, and a battery VB.
The alarm notification unit 110 includes a buzzer 111 that can issue a first alarm sound and a second alarm sound as an alarm sound, and a buzzer drive circuit 112 for driving the buzzer 111.

  The theft event detection unit 120 includes an abnormal situation detection switch unit 121 that opens and closes an electric circuit due to the theft. In FIG. 1, two configurations are simultaneously disclosed as an example of the abnormal state detection switch unit 121 for convenience, but are originally either one. One of them is a wire switch 122 spanned between the anti-theft tag 100 and an object. When the wire switch 122 is disconnected or pulled out by the theft, a circuit that has been closed in a normal state is opened. A signal indicating an abnormality is transmitted. The other one is a push switch 123, which is in a state in which the circuit is closed in a normal state where the antitheft tag 100 is attached to the object, and is opened in an abnormal state in which the antitheft tag 100 is removed from the object. A signal indicating abnormality is transmitted.

  The theft event detecting unit 120 includes a trigger signal receiving unit 124 that detects a trigger signal transmitted from the trigger signal transmitting unit 200, and the trigger signal receiving unit 124 is transmitted from a remote controller 125 operated by an administrator. A tag reception antenna (resonance circuit) 126 that receives a remote control signal to be transmitted or a trigger signal transmitted from the trigger signal transmission unit 200, and a comparator 127 that transmits a signal indicating that the tag reception antenna 126 has received the trigger signal. Yes. The comparator 127 is preferably a high sensitivity comparator.

  The remote controller 125 transmits to the anti-theft tag 100 a set signal for setting the anti-theft tag 100 in a warning state, a reset signal for stopping the issued alarm sound, and a reception sensitivity instruction signal.

  The sensitivity adjustment unit 130 changes the comparison threshold voltage (threshold voltage) input to the comparator 127 and sets the sensitivity of the theft event detection unit 120. The sensitivity setting unit 131 and a sensitivity storage unit 144 described later. And a sensitivity output unit 145. The sensitivity setting unit 131 includes a plurality of resistors R4, R3, and R2 having different resistance values, and the comparator 127 is configured by combining the outputs of the plurality of output ports P0, P1, and P2 of the CPU configuring the tag control unit 140. Set the comparison threshold voltage (threshold voltage).

Example 1 High sensitivity When the output port P0 is the logic output Lo and P1 and P2 are the logic output Hi, the comparison threshold voltage (threshold) having the lowest value is sent to the comparator 127 through the resistors R3 (2M) and R2 (4M). Voltage) is input, the sensitivity of the comparator 127 is increased, and the trigger signal receiving unit 124 becomes highly sensitive.

Example 2 Medium sensitivity If the output port P0 is a logic output Hi and P1 and P2 are logic outputs Lo, an intermediate comparison threshold voltage (threshold voltage) is input to the comparator 127 through the resistor R4 (33k). The sensitivity of the comparator 127 is medium, and the trigger signal receiving unit 124 is medium sensitivity.

Example 3 Low Sensitivity When the output ports P0, P1, and P2 are logic outputs Hi, the comparison threshold voltage (the highest value) is supplied to the comparator 127 through the resistors R4 (33k), R3 (2M), and R2 (4M). Threshold voltage) is input, the sensitivity of the comparator 127 is lowered, and the trigger signal receiving unit 124 is lowered in sensitivity.

  The tag control unit 140 including a CPU controls the alarm notification unit 110 to generate a first alarm sound when the abnormal state detection switch unit 121 is activated, and when the trigger signal reception unit 127 detects the trigger signal. A second alarm sound is issued, and includes a signal processing unit 141, an alarm control unit 142, a comparator power supply control unit 143, a sensitivity storage unit 144, a sensitivity output unit 145, and a battery 146.

  The signal processing unit 141 recognizes which of the abnormal event detection switch unit 121 and the trigger signal reception unit 124 of the theft event detection unit 120 has received the input signal, and issues the first alarm sound or the second alarm sound. Judge whether it is a report In addition, when the remote control signal transmitted from the remote controller 125 is a sensitivity setting signal, the signal processing unit 141 stores the high sensitivity setting parameter in the sensitivity storage unit 144 when the sensitivity setting signal is the high sensitivity setting signal. . When the sensitivity setting signal is a medium sensitivity setting signal, the medium sensitivity setting parameter is stored in the sensitivity storage unit 144. When the sensitivity setting signal is a low sensitivity setting signal, the low sensitivity setting parameter is stored in the sensitivity storage unit 144. After the storage mode, the set sensitivity is output via the sensitivity storage unit 144 and the sensitivity output unit 145.

  The alarm control unit 142 receives either an instruction from the signal processing unit 141, and is either a first alarm driving signal for generating a first alarm sound or a second alarm driving signal for generating a second alarm sound. Is output to the buzzer driving circuit 112.

  The comparator power supply control unit 143 controls the power supply input to supply the power supply power received from the battery 146 to the power supply input terminal c of the comparator 127 and applies a bias voltage to the + input terminal b of the comparator 127 via the bias circuit 128. Thus, the power supply to the power supply terminal c of the comparator 127 is controlled to be turned on / off to suppress the current consumption of the antitheft tag 100. Details will be described later.

  The sensitivity storage unit 144 stores the sensitivity state instructed from the signal processing unit 141 in accordance with the remote controller sensitivity setting signal, and instructs the sensitivity output unit 145 to combine the output ports P0, P1, and P2. The sensitivity output unit 145 controls the logic output Hi / Lo of the output ports P0, P1, and P2, and controls the combination of the output ports P0, P1, and P2.

  As shown in FIG. 3, the trigger signal transmission unit 200 includes a power supply unit 201, an antenna transmission signal generation unit 202, an antenna tuning / power amplifier unit 203, and a transmission antenna (antenna winding) 204.

  As shown in FIG. 5, the alarm sound identification unit 300 is arranged in a store that becomes the anti-theft alarm area A, and a first alarm sound identification device (ASD1) that identifies the first alarm sound that the anti-theft tag 100 issues. 301 and a second alarm sound identification device (ASD21, ASD22) 302 that is disposed near the entrance / exit of the anti-theft alarm area and identifies the second alarm sound issued by the anti-theft tag 100. The identification device 301 recognizes the first alarm sound issued by the anti-theft tag 100 and detects that a theft event has occurred inside the anti-theft alarm area A, and the second alarm sound identification device 302 prevents theft. The second alarm sound issued by the tag 100 is recognized and it is detected that a theft event has occurred near the entrance / exit of the theft alert area A.

  As shown in FIG. 2, the trigger signal transmitter 200 and the second alarm sound identification device 302 may be combined together, and this configuration is arranged as an integrated device near the entrance and exit as shown as ASD 21 in FIG. . In addition, the trigger signal transmission unit 200 and the second alarm sound identification device 302 may be separate devices, and this configuration is arranged as a separate device in the vicinity of the entrance / exit as shown as ASD 22 in FIG.

  The first warning sound identification device 301 and the second warning sound identification device 302 have the same configuration, and the basic technology is the same as that disclosed in Japanese Patent No. 5499927. As shown in FIG. , A sound feature analysis unit 320, a sound feature storage unit 330, a sound feature comparison unit 340, an alarm unit 350, an alarm buzzer 360, a wired alarm signal transmission unit 370, and a wireless alarm signal transmission unit 371 (wireless antenna 372). Either the wired alarm signal transmission unit 370 or the wireless alarm signal transmission unit 371 may be used.

  The microphone 310 captures an alarm sound issued from the antitheft tag 100 or the like, and here includes a function of amplifying a weak microphone signal and a filter function of mainly passing a frequency component of the alarm sound. Yes.

  The sound feature analysis unit 320 analyzes the sound captured from the microphone 310, that is, the sound feature of the acquired sound. In the present embodiment, the target alarm sound is a type in which a sound of several kHz is intermittently issued several times per second. As shown in FIG. 6, the first alarm sound has a sound feature in which a sound of frequency 3.6 kHz continues for a period of 100 ms, then stops sounding for a period of 100 ms, and is intermittently generated at intervals of 200 ms. . As shown in FIG. 7, the second alarm sound has a sound feature in which a sound having a frequency of 3.8 kHz continues for 80 ms, stops ringing for 70 ms thereafter, and is intermittently generated at intervals of 150 ms. In the present embodiment, the sound feature analysis unit 320 analyzes the frequency, duration, interval, and the like as the sound features of the acquired sound.

The sound feature storage unit 330 stores the sound feature of the first alarm sound in the first alarm sound identification device 301, and stores the sound feature of the second alarm sound in the second alarm sound identification device 302.
The sound feature comparison unit 340 stores the sound feature of the sound analyzed by the sound feature analysis unit 320 in the first alarm sound identification device 301, that is, the sound feature of the acquired sound captured by the microphone 310, and the sound feature storage unit 330. Compared with the sound feature of the first alarm sound, in the second alarm sound identification device 302, the sound feature of the sound analyzed by the sound feature analysis unit 320, that is, the sound feature of the acquired sound captured by the microphone 310, and the sound feature storage unit Compared with the sound feature of the second alarm sound stored in 330, if the sound feature matches, it is determined that the acquired sound is a registered (stored) alarm sound, and the alarm unit 350 is notified.

  The alarm unit 350 receives the notification from the sound feature comparison unit 340 and drives the alarm buzzer 360 to issue a separate alarm sound having a large volume with a sound feature different from the first alarm sound and the second alarm sound, Further, the information is wired or wirelessly distributed to a security system management apparatus disposed in a security room or the like through a wired alarm signal transmission unit 370 or a wireless alarm signal transmission unit 371 (wireless antenna 372).

  The operation of the above configuration will be described below. As shown in FIG. 8, when the transmission antenna 204 is an AM (acoustic magnetism) type antenna, for example, when the output frequency of the AM antenna is 45 Hz, 50 Hz, or 60 Hz, a trigger signal (frequency) is used depending on each case. 58 kHz, burst width 1.6 ms) is transmitted at a burst repetition period of 16.6 ms (45 Hz), 20 ms (50 Hz), and 22 ms (60 Hz).

  When the tag receiving antenna 126 is in the active state of the comparator 127, in order to receive the burst wave transmitted from the transmitting antenna 204, the time in which the comparator 127 is in the active state must be longer than the burst repetition period of the burst wave. is necessary.

  In the present embodiment, assuming that the burst frequency of the AM antenna is 45 Hz (burst repetition period 22 ms), the period during which the comparator 127 is in the active state is set to 30 ms.

  Further, here, the comparator power supply control unit 143 intermittently supplies power to the power supply terminal c of the comparator 127, for example, makes the comparator 127 enter a sleep state of 400 ms and operate intermittently as a 30 ms active state (operating state). .

  In this way, the average current consumption can be reduced by taking a longer time for the comparator 127 to be in the sleep state than the time for the comparator 127 to be in the active state. It becomes possible to use the comparator 127 that could not be used for the anti-theft tag 100.

  As a result, the use of the comparator 127 enables reception of a trigger signal at a low signal level, and the tag / antenna distance (reporting distance), that is, the antitheft tag 100 receives the trigger signal from the transmission antenna 204. Thus, the distance from the transmitting antenna 204 that reaches the alarm to the anti-theft tag 100 can be dramatically improved from 1.5 times to 2.0 times compared to the conventional case. It was less than half the size of the antenna.

  When the trigger signal transmitted from the transmission antenna 204 of the trigger signal transmission unit 200 is received by the tag reception antenna 126, the antenna output of the tag reception antenna 126 is input to the + terminal of the comparator 127, and the tag reception antenna 126 receives the trigger signal. The comparator 127 inputs this to the signal processing unit 141 at the comparator output terminal d.

  The tag control unit 140 waits in the sleep state, but when a comparator output is received, interrupt control is applied, and the signal processing unit 141 outputs a comparator output, that is, an input signal (resonance circuit) input from the tag receiving antenna 126 to the comparator 127. Output) is started, and thereafter, the tag controller 140 and the comparator 127 are in an operating state until the analysis of the input signal is completed.

  When the remote control signal transmitted from the remote control 125 is received by the tag reception antenna 126, the antenna output of the tag reception antenna 126 is input to the comparator 127, and the comparator 127 indicates that the remote control control signal has been received by the tag reception antenna 126. Input to the signal processing unit 141.

  The tag control unit 140 waits in the sleep state, but when a comparator output is received, interrupt control is applied, and the signal processing unit 141 outputs a comparator output, that is, an input signal (resonance circuit) input from the tag receiving antenna 126 to the comparator 127. Output) is started, and thereafter, the tag controller 140 and the comparator 127 are in an operating state until the analysis of the input signal is completed.

  An example of use will be described below. As shown in FIG. 5, an anti-theft tag 100 is attached to each product displayed in a store serving as an anti-theft alarm area, and a first alarm sound identification device 301 is installed at a predetermined position in the room. In the vicinity of the entrance / exit, a second alarm sound identification device 302 and a trigger signal transmission unit 200 are installed. As described above, the trigger signal transmission unit 200 and the second alarm sound identification device 302 may be combined together, and this configuration is ASD 21 in FIG. The alarm sound identification device 302 may be a separate device, and this configuration is shown as ASD 22 in FIG.

  FIG. 9 shows the tag / antenna between the anti-theft tag 100 when the trigger antenna 200 is placed at the store entrance and the sensitivity setting of the anti-theft tag 100 is set to high sensitivity, medium sensitivity, and low sensitivity. The distance (reporting distance) is shown.

L1 indicates a region where the anti-theft tag 100 receives a trigger signal from the transmission antenna 204 and issues a notification when the medium-sensitive anti-theft tag (medium sensitivity tag) 100 enters this region.
L <b> 2 indicates a region where the antitheft tag 100 receives a trigger signal from the transmission antenna 204 and issues a report when the high sensitivity antitheft tag (high sensitivity tag) 100 enters this region.

L3 indicates a region where the anti-theft tag 100 receives a trigger signal from the transmission antenna 204 and issues a notification when the low-sensitivity anti-theft tag (low sensitivity tag) 100 enters this region.
Example 1 Normally, when the sensitivity setting of the anti-theft tag 100 is set to the medium sensitivity setting, the antenna tuning of the trigger signal transmitting unit 200 and the power amplifier unit are adjusted so as to cover the entrance width BB of the store and then transmitted. The output of the antenna 204 is adjusted. That is, when the middle sensitivity anti-theft tag (medium sensitivity tag) 100 is taken out and enters the warning area L1, the anti-theft tag 100 issues a second alarm.

  Example 2 When the frontage width of the store entrance is a wider frontage width AA than BB in Example 1, the sensitivity setting of the antitheft tag 100 is set to a high sensitivity setting so that the frontage width AA is wider. The antitheft tag 100 can also be used. For this reason, it becomes possible to reduce the number of antennas installed even at the entrance with a wide frontage width, and a more economical system can be obtained.

  Example 3 In the case of a store having a small depth or area, a product display 400 is often placed inside the area L1 near the store entrance. In this case, the product displayed on the product display 400 If the anti-theft tag 100 with medium sensitivity is attached, the anti-theft tag 100 will issue a second alarm, so that the anti-theft tag 100 cannot be attached to the product. In such a case, an anti-theft tag 100 is issued over the full width of the wide frontage width BB by attaching a medium-sensitivity anti-theft tag (medium sensitivity tag) 100 to a product displayed at a place away from the store entrance. In this way, security can be improved by attaching a low-sensitivity anti-theft tag (low-sensitivity tag) 100 to the products displayed on the product display stand 400 near the store entrance.

  Next, when an event occurs in which the antitheft tag 100 is removed from the product due to theft, the abnormal situation detection switch unit 121 of the theft event detection unit 120 is activated, and a signal indicating the abnormality is transmitted to the signal processing unit 141. .

  Alternatively, when an event occurs in which the product is carried out of the room with the anti-theft tag 100 attached due to the theft, the theft event detection unit 120 is connected to the transmission antenna 204 of the trigger signal transmission unit 200 disposed near the entrance / exit. The trigger signal to be transmitted is received by the tag receiving antenna (resonance circuit) 126 of the trigger signal receiving unit 124, and the comparator 127 transmits to the signal processing unit 141 that the tag receiving antenna 126 has received the trigger signal.

  When the signal processing unit 141 receives an input signal from the abnormal state detection switch unit 121 or the trigger signal receiving unit 124, the tag control unit 140 becomes active, and the signal processing unit 141 includes the abnormal state detection switch unit 121 of the theft act detection unit 120. And the trigger signal receiving unit 124 from which the input signal is received, it is determined whether the first alarm sound is issued or the second alarm sound is issued, and the alarm control unit 142 instructs the signal processing unit 141 to In response to this, either the first alarm driving signal for generating the first alarm sound or the second alarm driving signal for generating the second alarm sound is output to the buzzer driving circuit 112 to the alarm notification unit. The first alarm sound or the second alarm sound is issued to notify surrounding people that a theft event has occurred.

  As described above, the anti-theft tag 100 issues the first alarm sound and the second alarm sound having different sound characteristics as the alarm sound, so that when the first alarm sound is issued, the place where the theft event occurs is theft alert. It can be determined that the area is inside the area, and when the second alarm sound is generated, it can be determined that the location of the theft event is near the entrance / exit of the theft alarm area. Can be promoted.

Further, the alarm sound identification unit 300 recognizes the first alarm sound by the first alarm sound identification device (ASD1) 301 when the anti-theft tag 100 issues the first alarm sound.
That is, the first alarm sound identification device 301 analyzes the characteristics of the acquired sound captured from the microphone 310 by the sound feature analysis unit 320, and the sound characteristics of the first alarm sound and the sound of the acquired sound stored in the sound feature storage unit 330. The feature is compared with the sound feature comparison unit 340, and if the sound features match, it is determined that the acquired sound is the first alarm sound, and the alarm buzzer 360 of the alarm unit 350 uses the first alarm sound or the second alarm sound. In addition, a separate alarm sound different from the alarm sound of the second alarm sound identification device 302 is issued, or another alarm device is operated by wire from the wired alarm signal transmission unit 370, or the wireless alarm signal transmission unit 371 (wireless The other alarm device is activated by a wireless signal emitted from the antenna 372) to notify the administrator that a theft event has occurred in the inner area of the theft alarm area A.

When the anti-theft tag 100 issues a second alarm sound, the alarm sound identification unit 300 recognizes the second alarm sound by the second alarm sound identification device (ASD2) 302.
That is, the second alarm sound identification device 302 analyzes the characteristics of the acquired sound captured from the microphone 310 by the sound feature analysis unit 320, and the sound characteristics of the second alarm sound and the sound of the acquisition sound stored in the sound feature storage unit 330. The feature is compared by the sound feature comparison unit 340, and if the sound features match, it is determined that the acquired sound is the second alarm sound. The alarm buzzer 360 of the alarm unit 350 uses the first alarm sound or the second alarm sound. In addition, a separate alarm sound different from the alarm sound of the first alarm sound identification device 301 is issued, or another alarm device is operated by wire from the wired alarm signal transmission unit 370, or the wireless alarm signal transmission unit 371 (wireless The other alarm device is activated by a radio signal emitted from the antenna 372) to notify the administrator that a theft event has occurred near the entrance / exit of the theft alert area A.

  As described above, in the present embodiment, the sound characteristics of the first alarm sound and the second alarm sound of the alarm sound are different, so that the place where the theft event occurs due to the alarm sound issued by the anti-theft tag 100. Can be identified, and prompt action of the security officer after the warning sound is triggered can be promoted.

  The first alarm sound or second alarm sound, which is an alarm sound issued by the anti-theft tag 100, is detected by the first alarm sound identification device 301 or the second alarm sound identification device 302 of the alarm sound identification unit 300 and theft event The occurrence of a theft event in the burglar alarm area A is not hindered by electromagnetic noise emitted from lighting devices, electrical equipment, power supply lines, etc., as in the case of detecting conventional radio waves. Can be reliably detected.

  The antenna for general anti-theft use described in Patent Document 1 needs to receive electromagnetic noise of small electromagnetic energy at the time of an alarm emitted from a tag. Therefore, a large receiving antenna is necessary, and generally 30 cm. * The receiving antenna is about 150cm in size.

  On the other hand, in the present invention, since the alarm sound issued by the anti-theft tag 100 is identified and the high-sensitivity comparator 127 is used for the anti-theft tag 100, a conventional large antenna is unnecessary, and the anti-theft application As a trigger signal transmission antenna, a small antenna may be used for the transmission antenna 204 of the trigger signal transmission unit 200. Even when the second alarm sound identification unit 302 and the trigger signal transmission unit 200 are integrated, Since the dual alarm sound identification device 302 can be made small, the antenna has a feature that it can be miniaturized to a size of about 30 cm * 50 cm.

  Further, in a general anti-theft antenna described in Patent Document 1, when a tag enters an area near the trigger signal antenna, the tag issues an alarm (tag alarm). At that time, the electromagnetic noise generated from the buzzer of the tag is received by the receiving antenna integrated in the trigger signal antenna, and the trigger signal antenna itself also generates an alarm sound (antenna alarm) different from the alarm sound of the tag. To do. However, the electromagnetic noise generated by the buzzer of the tag when the tag alarm is issued is extremely weak. Therefore, the distance between the tag / antenna that the receiving antenna can feel the electromagnetic noise of the buzzer and sound the antenna alarm is usually about 2m. It is an extremely short receivable distance. On the other hand, the present invention is characterized in that the distance at which the alarm sound can be identified by the first and second alarm sound identification devices 301 and 302 is an extremely long distinguishable distance, usually about 20 m.

  Therefore, in the present invention, the transmission antenna 204 of the trigger signal transmission unit 200 is ½ or smaller than the conventional antenna for anti-theft use, and the trigger signal transmission unit 200 installed near the store entrance and Since the number of installed alarm sound identification devices 302 can be reduced, the cost of the system can be greatly reduced, and the factor that impairs the beauty of the vicinity of the entrance / exit in a luxury goods store or the like can be suppressed.

  In the present embodiment, the warning sound identification unit 300 includes the first warning sound identification device 301 that identifies the first alarm sound that the anti-theft tag 100 issues and the second alarm that the anti-theft tag 100 issues. The thing which has the 2nd warning sound identification device 302 which identifies a sound was illustrated.

  However, the warning sound identification unit 300 can also be used as a warning sound identification device that identifies the first alarm sound and the second alarm sound that the anti-theft tag 100 issues, and this warning sound identification device can be used. By arranging it in the store, at the entrance / exit, etc., the first alarm sound issued by the anti-theft tag 100 is recognized to detect that the theft event has occurred in the anti-theft area, and the anti-theft tag 100 issues an alarm. The second alarm sound is recognized to detect that a theft event has occurred near the entrance / exit of the theft alert area.

  The alarm sound identification unit 300 can be configured to include only the first alarm sound identification device 301 that identifies the first alarm sound issued by the anti-theft tag 100, and the first alarm sound issued by the anti-theft tag is displayed. Recognize and detect that a theft event has occurred within the theft alert area. Further, the alarm sound identification unit 300 may be configured to include only the second alarm sound identification device 302 that identifies the second alarm sound issued by the anti-theft tag 100, and the second anti-theft tag 100 issues a second alarm sound. An alarm sound is recognized to detect that a theft event has occurred near the entrance / exit of the theft alert area.

100 anti-theft tag 110 alarm issuing unit 111 buzzer 112 buzzer drive circuit 120 theft act event detection unit 121 abnormal situation detection switch unit 122 wire switch 123 pressing switch 124 trigger signal receiving unit 125 remote control 126 tag receiving antenna (resonance circuit)
127 comparator 130 sensitivity adjustment unit 131 sensitivity setting unit 140 tag control unit 141 signal processing unit 142 alarm control unit 143 comparator power supply control unit 144 sensitivity storage unit 145 sensitivity output unit 146 battery 200 trigger signal transmission unit 201 power supply unit 202 antenna transmission signal generation Part 203 antenna tuning / power amplifier part 204 transmitting antenna (antenna winding)
300 Alarm sound identification unit 301 First alarm sound identification device (ASD1)
302 Second alarm sound identification device (ASD21, ASD22)
310 microphone 320 sound feature analysis unit 330 sound feature storage unit 340 sound feature comparison unit 350 alarm unit 360 alarm buzzer 370 wired alarm signal transmission unit 371 wireless alarm signal transmission unit 372 wireless antenna 400 product display stand

Claims (4)

An alarm notification unit capable of issuing an alarm signal, a trigger signal receiving unit for detecting a trigger signal transmitted from the outside, and an alarm signal by controlling the alarm notification unit when the trigger signal receiving unit detects the trigger signal Equipped with a tag control unit
The trigger signal receiving unit has a tag receiving antenna that receives the trigger signal, and a comparator that transmits a signal indicating that the tag receiving antenna has received the trigger signal to the tag control unit,
The anti-theft tag, wherein the tag control unit includes a comparator power supply control unit that controls power supplied to the comparator to intermittently operate the comparator.   The anti-theft tag according to claim 1, wherein the tag control unit includes a sensitivity adjustment unit that sets a sensitivity of the trigger signal receiving unit by changing a comparison threshold voltage input to the comparator.   An anti-theft system comprising the anti-theft tag according to claim 1 and a trigger signal transmitting unit for transmitting a trigger signal in the vicinity of an entrance / exit of an anti-theft area. The anti-theft tag according to claim 1 or 2, wherein the anti-theft tag is attached to an object placed in an anti-theft alarm area, and two alarm sounds different from the first alarm sound and the second alarm sound when a theft event occurs. Identify at least one alarm sound from anti-theft tag that reports any sound, trigger signal transmitter that transmits a trigger signal near the entrance / exit of the anti-theft alarm area, and alarm sound that the anti-theft tag reports A warning sound identification unit
The anti-theft tag has an alarm reporting unit capable of issuing a first alarm sound and a second alarm sound, an abnormal state detection switch unit that opens and closes an electric circuit due to theft, and a trigger signal transmission unit. It has a theft event detection unit with a trigger signal reception unit that detects the transmitted trigger signal, controls the alarm notification unit, and issues the first alarm sound when the abnormal state detection switch unit is activated , Having a tag control unit for generating a second alarm sound when the trigger signal receiving unit detects the trigger signal,
The alarm sound identification unit recognizes an identifiable alarm sound among alarm sounds issued by an anti-theft tag and detects that a theft event has occurred.

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