JP2000259958A - Shoplifting and burglary preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shoplifting and burglary preventing device for detecting the shoplifting of plural kinds of merchandise by a gate sensor even when plural persons simultaneously pass through the gate sensor. SOLUTION: A radio tag is attached to the merchandise of a store, and radio waves from the radio tag are received, and an alarm is generated at the entrance/exit of the store in this shoplifting and burglary preventing device. This device is provided with a radio tag 2 capable of the setting of transmission frequencies by the setting of data constituted of plural bits, a receiving circuit for receiving a transmission signal from the radio tag 2, a frequency receiving and detecting circuit 31 for receiving a signal from the receiving circuit, and for individually detecting the transmission signal with frequencies set by the setting of the data, and for individually generating a detection signal, and an alarm device 32 for receiving the individual detection signal from the frequency receiving and detecting circuit 31, and for generating a different alarm signal according to the detecting state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-shoplifting antitheft device, and more particularly, to wireless communication of goods in a CD or video shop, a CD or video rental shop, a small goods shop or a home electronics shop. The present invention relates to an anti-shoplifting antitheft device that can detect shoplifting of a plurality of products with a gate sensor when a tag is attached and the gate sensor detects the shoplifting.

[0002]

2. Description of the Related Art Conventionally, in a shoplifting theft prevention device using a wireless tag and a gate sensor, when a product with the wireless tag passes through the gate sensor, the state of the wireless tag is set to 1 bit ON / OFF.
It senses when it is OFF and judges only whether or not it has been cleared. Therefore, it is not possible to check a plurality of types of uncleared products passing through the gate. On the other hand, in the case of shoplifting by one person, the same product is rarely stolen, and in the case of multiple shoplifting, the same product is unlikely to be the same product. By the way, as a device for preventing simultaneous theft of a plurality of products, a device in which a product rack itself monitors the weight of displayed products to prevent the simultaneous theft of a plurality of products, as disclosed in Japanese Patent Application Laid-Open No. 63-24491. It is.

[0003]

In the former shoplifting antitheft device using a wireless tag and a gate sensor, even if an attempt is made to prevent simultaneous theft of a plurality of kinds of products, a large number of people systematically open the gate. When passing, there is a problem that only one shoplifter can be detected. In other words, in the case of simultaneous shoplifting by several people, other people than one can escape, and in some cases only one of the group is caught and completed. In the latter case, theft of many commodities is a detection target, and it is not possible to cope with shoplifting in which many commodities steal several commodities simultaneously from different merchandise shelves. SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem of the prior art, and a shoplifting theft that can detect shoplifting of a plurality of types of products even when a plurality of people pass through the gate sensor at the same time. It is to provide a prevention device.

[0004]

A feature of the anti-shoplifting antitheft device for achieving the above object is that a wireless tag is attached to merchandise in a store, and a radio wave from the wireless tag is received at an entrance of the store. In an anti-shoplift anti-theft device that generates an alarm, a wireless tag whose transmission frequency can be set by setting data of a plurality of bits, a receiving circuit that receives a transmission signal from the wireless tag, and a signal that is received from the receiving circuit A frequency reception detection circuit that individually detects transmission signals of a frequency set by data setting and individually generates a detection signal, and receives individual detection signals from this frequency reception detection circuit and responds to the state indicated by them. And an alarm device for generating different alarm signals.

[0005]

As described above, if a wireless tag whose transmission frequency can be set by setting data is provided and different data is set according to the type of product, the wireless tags can transmit at different frequencies. Therefore, the alarm device receives the frequency of each wireless tag and detects it individually,
By generating different alarms according to the detection state, shoplifting of a plurality of different products can be detected at the same time. In this case, the setting data of a plurality of bits is, for example, 4 bits.
If it is a bit, it can correspond to 15 types of products, and simultaneous detection of many products is possible. Also,
Since the type of the product can be known, the product name can be displayed on the display device at the time of displaying the alarm.

[0006]

FIG. 1 is a block diagram showing an embodiment of a shoplifting antitheft device according to the present invention, FIG. 2 is an explanatory diagram of an internal configuration of a wireless tag, and FIG. 3 is a flowchart of detection processing of an alarm device. FIG. 4 is an explanatory diagram of a warning information table. Reference numeral 10 denotes a shoplifting antitheft device, which comprises a gate 6 having a gate sensor 1 and a wireless tag 2 for transmitting and receiving to and from the sensor sensor 1. The wireless tag 2 is attached to a product 7. As shown in FIG. 2, the wireless tag 2 has a gate 6 serving as an antenna.
A power supply circuit 21 for receiving radio waves of a predetermined frequency from the power supply circuit and charging the capacitor 21a to generate electric power;
Re-writable nonvolatile register 2 such as M, FERAM, etc.
2, a D / A conversion circuit (D / A) 23, a VCO (voltage controlled oscillation circuit) 24, a transmission circuit 25, and a housing 26 serving as an antenna. The data setting in the nonvolatile register 22 is performed by a writing device from an external terminal connected to the nonvolatile register 22 provided in the wireless tag 2. Is not shown.

Each circuit operates with the electric power charged in the capacitor 21a, and the D / A 23 generates a control voltage of the VCO 24 according to the data stored in the nonvolatile register 22, and the oscillation of the VCO 24 according to the voltage. Is controlled, and a signal having a frequency corresponding to the data stored in the nonvolatile register 22 is output. This output is transmitted to the gate sensor 1 via the transmission circuit 25 and the housing (antenna) 26 as a transmission signal of a frequency corresponding to the data of the nonvolatile register 22. Note that a data conversion circuit may be provided in place of the D / A 23, and a ring oscillator that feeds back the output of the shift register to the input may be provided in place of the VCO 24. In this case, the data stored in the nonvolatile register 22 is stored. It is preferable to adopt a form in which data is converted into bit string data corresponding to a frequency by a data conversion circuit and set in a ring oscillator.

In FIG. 1, a gate sensor 1 has a gate 6 as an antenna and has a transmission / reception circuit therein. The anti-shoplift anti-theft device 10 has an alarm device 3, a display device 4, and an audio output device 5 in addition to the gate sensor 1. The alarm device 3 is a device that receives a signal received from the gate sensor 1 and processes an alarm. The alarm device 3 is provided in correspondence with the transmission frequency of the wireless tag 2. 31n, and an alarm processing device 32 for receiving detection signals of the specific frequency reception detection circuits 31a, 31b,... 31n. The specific frequency reception detection circuits 31a to 31n are circuits for detecting specific reception frequencies which are individually assigned, for example, a tuning circuit corresponding to the frequency to be detected and a detection circuit for detecting an output of the tuning circuit. It comprises a circuit and a comparator which detects whether a specific frequency is received by comparing the detected signal with a threshold value, and outputs the output of each comparator to the interface 37 of the alarm processing device 32 as a tag detection signal. You.

The alarm processor 32 includes an MPU 34, a memory 35, an alarm information table 36, and an interface 37, and these circuits are mutually connected by a bus 38. The alarm processing program 33 is stored in the memory 35, and receives the tag detection signals of the specific frequency reception detection circuits 31a to 31n via the interface 37.
The interface 37 includes a specific frequency reception detection circuit 31a.
When a detection signal (tag detection signal) is received from any one of .about.31n, an interrupt signal is generated. The MPU 34 executes the alarm processing program 33 in response to the interrupt signal. The alarm processing program 33 is such that the MPU 34
, The frequency detection signal received from the interface 37 is read as data. This data handles each tag detection signal of the specific frequency reception detection circuits 31a to 31n as one data, and is a bit data string corresponding to the type of frequency to be detected.
This data string is hereinafter referred to as tag detection data. The alarm information table 36 is searched according to the tag detection data, and a corresponding alarm sound and a corresponding warning display are performed. Then, the next received signal is monitored by referring to the data of the interface 37 depending on whether there is another detection signal.

The alarm information table 36 is, as shown in FIG. 4, a warning information table in which information on what kind of alarm processing is performed is registered. This includes a tag detection data column 36a, a display information column 36b, and a generated frequency column 36.
c, an occurrence pattern column 36e is provided.
34 searches the tag detection data column 36 based on the tag detection data obtained by referring to the interface 37, sends the contents of the display information column 36b of that line to the display device 4, and determines the frequency of the generated sound. An alarm signal is generated according to the contents of the generation frequency column 36c and the generation pattern column 36d, and sent to the audio output device 5. In particular, when the number of bits is made to correspond one-to-one to the type of product, the type of product can be surely known. It is possible to display at four positions, which makes it possible to clearly ask the person who tried to take out the product. The pattern in the occurrence pattern column 36e corresponds to the detection of a single product when the pattern is repeated in a predetermined cycle, and corresponds to the detection of a plurality of products when the pattern is alternately repeated. I do. For the sake of explanation,
Although the content is described by the pattern number, data for generating the above-mentioned sound may be directly stored. The display device 4 is a display device that performs an alarm display according to the contents of the display information column 36b sent from the alarm device 3, and the audio output device 5 generates an alarm sound based on the above-described signal from the alarm device 3. Is a voice generating device.

As an alarm operation, the gate sensor 1 receives transmission signals of different frequencies transmitted according to a plurality of bits of data stored in the nonvolatile register 22 inside the wireless tag 2. At this time, by transmitting transmission signals of different frequencies from the respective wireless tags 2 to the gate sensor 1 according to the type of the product, the specific frequency reception detection circuit 31a,
31n receives and detects the transmission frequency. Here, the detected signal is sent to the alarm processor 32.
To send to. The alarm processing device 32 outputs the detected signal as 1
Are treated as two data strings, and different alarms and warnings are generated according to the data strings. Thereby, it is detected whether different types of commodities are taken out at the same time. At this time, even when each of the products is taken out by a plurality of persons, it can be detected by the difference in the state of the alarm.

Now, the nonvolatile register 22 of the wireless tag 2
And the bit data stored in the
The relationship between the oscillation frequency of O24 and the oscillation frequency of VCO 24 will be described. For example, the relationship between the 4-bit data stored in nonvolatile register 22 and the oscillation frequency of VCO 24 is as follows.
Assuming 0.2 MHz, “0001” is 1.0 MHz,
“0010” is 1.2 MHz, “0011” is 1.
4 MHz, "0110" is 1.6 MHz. “0
111 "is 1.8 MHz," 1000 "is 2.0M
Hz and “1001” are 2.2 MHz. “00
00 "means that transmission is not performed when these bits are" 0 ". At the time of display of goods, at least one of the four bits is in the" 1 "state.
When selling in the POS register, all bits are reset to '0' to indicate that the sale is legal. In this example, since it is shown in a 4-bit configuration, it is possible to classify 15 types of products, but to increase the types of product differentiation,
The number of bits may be increased. Further, in order to increase the detection accuracy, a large numerical value of the difference from the adjacent frequency may be used.

FIG. 4 is a flowchart of a detection process of the alarm device 3. When the wireless tag 2 passes through the gate sensor 1, the gate sensor 1 reads the data stored in the wireless tag 2 (bit data stored in the nonvolatile register 22).
As a result, a radio wave having a frequency corresponding to the received signal is received and detected in accordance with the reception frequency (step 101). Alarm device 3
The alarm processing device 32 performs detection by referring to the data of the interface 37 based on the received information (step 102). If it is determined that the data is illegally taken out, the alarm processing device 32 refers to the warning information table 5 (step 103). Then, an alarm corresponding to the received information is sent to the display device 4 and the audio output device 5, and a specific sound is output from the audio output device 5 (step 104). Next, the input of the stop key is determined (step 105), and it is determined whether to stop the alarm. If NO here, the process returns to step 102, and the above-mentioned detection is performed by referring to the data of the interface 37. If YES, the alarm is ended (step 106), and this process ends.

As a result, when a plurality of persons pass through the gate sensor 1 at the same time and each person tries to take out a shoplifted product, the volume, the sound frequency, and the display method change according to the type of the product, so that they are distinguished. be able to. Further, when the gate sensor 1 detects the passage of a new wireless tag 2 during the warning operation, a warning corresponding to the newly received information,
Generate a warning. As long as the warnings are different, multiple types of take-out of the goods can be detected, and the warnings and warnings are continued until they are released.

[0015]

As can be understood from the above description, according to the present invention, if a wireless tag whose transmission frequency can be set by data setting is provided and different data is set in accordance with the type of product, the wireless tag can be used. Can be transmitted at different frequencies. Therefore, the alarm device receives the frequency of each wireless tag and individually detects the frequency, and generates a different alarm according to the detection state, whereby shoplifting of a plurality of different products can be detected at the same time. In this case, if the setting data of a plurality of bits is, for example, 4 bits, 15 bits
It is possible to correspond to various types of products, and it is possible to simultaneously detect many products.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a shoplifting antitheft device of the present invention.

FIG. 2 is an explanatory diagram of an internal configuration of a wireless tag.

FIG. 3 is a flowchart of a detection process of the alarm device.

FIG. 4 is an explanatory diagram of a warning information table.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gate sensor, 2 ... Wireless tag, 3 ... Alarm device, 4 ...
Display device, 5: audio output device, 6: gate, 10: anti-shoplifting antitheft device, 7: product, 21: power supply circuit, 22: rewritable nonvolatile register, 23: D / A conversion circuit (D / A) ), 24 ... VCO (Voltage Controlled Oscillator), 25
... transmitting circuit, 26 ... antenna, 30 ... transmitting circuit, 31 ...
Receiving circuits, 31a, 31b, 31n: specific frequency reception detecting circuit, 32: alarm processing device, 33: alarm processing program, 34: MPU, 35: memory, 36: alarm information table, 37: interface.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C084 AA03 AA09 BB31 CC35 DD07 EE07 GG24 GG42 GG43 HH02 HH12

Claims (2)

[Claims] An anti-shoplift anti-theft device that affixes a wireless tag to a product in a store and receives an electric wave from the wireless tag at a doorway of the store to generate an alarm, wherein a transmission frequency is set by setting data comprising a plurality of bits. A wireless tag that can be set, a receiving circuit for receiving a transmission signal from the wireless tag, and a signal from the receiving circuit, individually detecting a transmission signal of a frequency set by the data setting, A frequency reception detection circuit that individually generates a detection signal; and an alarm device that receives the individual detection signals from the frequency reception detection circuit and generates a different alarm signal according to a state indicated by the detection signal. Shoplift anti-theft device. 2. The wireless tag according to claim 1, further comprising: a rewritable memory for storing data set therein; and an oscillating circuit for generating a signal having a frequency corresponding to the transmission frequency in accordance with a value stored in the memory. The shoplifting antitheft device according to claim 1, further comprising: