CN106611466A - Commodity anti-theft device - Google Patents
Commodity anti-theft device Download PDFInfo
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- CN106611466A CN106611466A CN201510706864.XA CN201510706864A CN106611466A CN 106611466 A CN106611466 A CN 106611466A CN 201510706864 A CN201510706864 A CN 201510706864A CN 106611466 A CN106611466 A CN 106611466A
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- main body
- theft
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
- G08B13/1409—Mechanical actuation by lifting or attempted removal of hand-portable articles for removal detection of electrical appliances by detecting their physical disconnection from an electrical system, e.g. using a switch incorporated in the plug connector
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- Burglar Alarm Systems (AREA)
Abstract
The invention provides a commodity anti-theft device. The commodity anti-theft device comprises a first main body and a second main body, wherein the first main body and the second main body are respectively provided with a shell, both the first main body and the second main body are provided with an anti-theft alarm circuit, and the anti-theft alarm circuit of the first main body and the anti-theft alarm circuit of the second main body are connected by a single wire. The commodity anti-theft device can realize that the two main bodies are connected through a conventional single wire so as to perform anti-theft protection, only a signal wire made of a steel wire rope is provided, and a ground wire made of an easily broken core wire is not adopted. The commodity anti-theft device can be widely applied to split type device for commodity anti-theft display and the like, the service life of the device is prolonged, the anti-theft effect is good, and a false alarm is avoided. In addition, the split two main bodies can alarm at the same time, so that the anti-theft effect is further improved.
Description
Technical field
The present invention relates to a kind of anti-theft device for commodities, more particularly to a kind of device is divided between main frame, slave two parts and two parts and adopts wire to connect to realize the anti-theft device for commodities that commodity are reported to the police.
Background technology
Current goods display antitheft apparatus, are mainly made up of, i.e., two parts：Base and inductive head.Base, inductive head are connected by the steel wire rope wire with heart yearn, steel wire rope forms a circuit loop with heart yearn, prior art goods display antitheft apparatus structure diagram is shown in Fig. 1, prior art goods display antitheft apparatus electrical schematic diagram is shown in Fig. 2, and steel wire rope conductive wire cross-section schematic diagram of the prior art with heart yearn is shown in Fig. 3.
Inductive head wiring board is arranged on the loop that steel wire rope is formed with heart yearn; insulate between steel wire rope and heart yearn, outermost wraps up a layer insulating, make the spooler or spring wire being coiled into that be in line; protected commodity are arranged on inductive head, when there is following one of which situation：Commodity are removed from inductive head, wire is cut off, base is removed from installation table top; base circuit can control to send audible alarm; and LED flashes, to remind management personnel to be processed, for expensive article carries out self service and carries out effective protection that extraordinary effect can be played.
Existing goods show anti-theft device, because protected commodity are arranged on inductive head, when potential customer experiences, checks commodity; the general inductive head that all can in succession lifts together commodity, so as to affect steel wire rope wire, when wire is pulled often; such as, after more than 30000 times（The life-span of goods display antitheft apparatus calculated for 3 years, and average daily 28 times, this is not a very high frequency for the very big shop of the volume of the flow of passengers, also）, the heart yearn inside wire easily breaks, and so as to causing the false alarm of anti-theft device for commodities or not reporting to the police, to management personnel puzzlement is caused, and can not meet shop to showing the requirements for life of anti-theft device.
In addition, existing goods show anti-theft device, also have one disadvantage in that：Audible alarm module, LED all can only be arranged under normal circumstances on the circuit of base, when thief cuts off wire and takes the commodity on inductive head away, only base is reported to the police, the inductive head of attachment commodity then will not report to the police, management personnel cannot in time have found that who is thief, so as to cannot quickly recover commodity.
The content of the invention
The technical problem to be solved is to provide a kind of anti-theft device for commodities, can connect two main bodys using solid conductor, improves the service life of device, and two-way detection of breaking, good anti-theft effect simultaneously avoids reporting by mistake.For this purpose, the present invention is employed the following technical solutions：
A kind of anti-theft device for commodities, including the first main body and the second main body, first main body and the second main body are respectively arranged with shell, it is characterized in that first main body and the second main body are provided with anti-theft warning circuit, connected by solid conductor between first main body and the anti-theft warning circuit of the second main body；
Feedback signal detection module, signal generating source module, signal conversion circuit are respectively provided with the anti-theft warning circuit of the first main body and the second main body, the solid conductor is connected between the port of the signal conversion circuit of the signal conversion circuit port of the first main body and the second main body；
In first main body, signal generating source module is used to send frequency for first frequency F1, the arbitrary square wave W1 of dutycycle, signal conversion module is used to for square wave W1 to be transformed to primary sinusoid W2 that generation rule, frequency are first frequency F1, solid conductor described in primary sinusoid W2 Jing inputs to the signal conversion circuit of the second main body, the detection output of feedback signal detection module；
In second main body, signal generating source module is used to send frequency for second frequency F2, the arbitrary square wave W3 of dutycycle, signal conversion module is used to for square wave W3 to be transformed to the second sine wave W4 that generation rule, frequency are first frequency F1, solid conductor described in second sine wave W4 Jing inputs to the signal conversion circuit of the first main body, the detection output of feedback signal detection module；
The signal conversion module of the first main body is additionally operable to be overlapped primary sinusoid W2 and the second sine wave W4, and the signal conversion module of the second main body is also additionally operable to be overlapped primary sinusoid W2 and the second sine wave W4；
The signal of the signal conversion module that the feedback signal detection module in first main body is used in the first main body of detection, the signal of the signal conversion module that the feedback signal detection module in the second main body is used in the second main body of detection.
Further, first main body is the base in commodity anti-theft exhibiting device, and second main body is the inductive head in commodity anti-theft exhibiting device.
Further, the signal generating source module and feedback signal detection module of the first main body can be realized the function of both by microprocessor or integrated circuit, and the signal generating source module and feedback signal detection module of the second main body can also be realized the function of both by microprocessor or control chip.
Further, one of main body of the first main body and the second main body is separably shelved in another main body；Rechargeable battery and charging circuit are both provided with described two main bodys, contact switch is set between two main bodys, during so that one of main body is shelved in described another main body, described another main body can charge to one of main body, when one of main body leaves described another main body, described another main body can not charge to one of main body.
Further, it is in anti-theft warning circuit at least provided with the one kind in voice guard and light-emitting alarm, voice guard and light-emitting alarm in the first main body and the second main body, and is connected with above-mentioned microprocessor or control chip.
Due to adopting technical solution of the present invention, can realize that conventional solid conductor connects two main bodys and carries out anti-theft protection, only steel wire rope does signal conductor, and without easily disconnected heart yearn ground wire is made；The present invention can be widely applied in the split type devices such as commodity anti-theft displaying, improve the service life of device, and good anti-theft effect simultaneously avoids reporting by mistake, and can realize being reported to the police while two main bodys of split simultaneously, further improve anti-theft effect.
Description of the drawings
Fig. 1 is background technology goods display antitheft apparatus structure diagram
Fig. 2 is background technology goods display antitheft apparatus electrical schematic diagram
Fig. 3 is the cross-sectional view with heart yearn steel wire rope wire used by background technology goods display antitheft apparatus.
Fig. 4 is the signal transduction schematic flow sheet of the present invention.
Fig. 5 is the connection diagram of the first main body and the second main body anti-theft warning circuit.
Specific embodiment
Referring to the drawings shown in 1,2,3.Current goods display antitheft apparatus, are mainly made up of, i.e., two parts：Base 100 and inductive head 200.Base 100, inductive head 200 are connected by the wire of steel wire rope 302 with heart yearn 301, and steel wire rope 302 makes the anti-theft warning circuit in base form a circuit loop with heart yearn 301.
Inductive head wiring board is arranged on the loop that steel wire rope is formed with heart yearn; insulate 303 between steel wire rope and heart yearn, outermost wraps up a layer insulating 304, making is in line the spooler or spring wire being coiled into; protected commodity are arranged on inductive head, when there is following one of which situation：Commodity are removed from inductive head, wire is cut off, base is removed from installation table top, and base circuit can control to send audible alarm, and LED flashes, to remind management personnel to be processed.Drawing reference numeral 201 is the switch whether the sensing item to be protected on inductive head leaves inductive head, and drawing reference numeral 101 is that the switch whether base is lifted is sensed on base.
Referring to the drawings 4.Anti-theft device for commodities provided by the present invention, including the first main body and the second main body, the first main body 1 and the second main body 2 are respectively arranged with shell, and the present embodiment is by taking goods display antitheft apparatus as an example, first main body 1 and the second main body 2 are respectively base and inductive head, and its relation also refers to Fig. 1.
Base and inductive head are provided with anti-theft warning circuit.
Feedback signal detection module 13, signal generating source module 11, signal conversion circuit 12 are set in the anti-theft warning circuit of base；Feedback signal detection module 23, signal generating source module 21, signal conversion circuit 22 are set in the anti-theft warning circuit of inductive head.
Connected by solid conductor 3 between the port of the signal conversion circuit of the signal conversion circuit port and inductive head of base；The solid conductor refers to a signal conductor, without ground wire.
As first main body 1 is with the circuit theory connection in the second main body 2, but each component parameter is different, and for convenience, in the present embodiment Fig. 5, in the first main body 1, the circuit diagram of the second main body 2, function identical components and parts use identical symbology.
The present invention detects the connection status of solid conductor by feedback signal detection module, and successful connection is state2, and it is state1 to be not connected with or break.
When the signal generating source module 11 of base sends frequency for F1, the arbitrary square wave W1 of dutycycle.The generation rule of Jing base signals conversion module 12, frequency are the sine wave W2 of F1.Feedback signal detection module 13 can detect current signal condition and be designated as state1, the port 2 of signal conversion circuit 12 is output as frequency and F1 identical sine wave W2, solid conductor 3 is arrived in sine wave W2 outputs, and the other end of solid conductor 3 is connected with the port 4 of signal conversion circuit 22 of inductive head.The signal generating source module 21 of inductive head produce frequency be F2 dutycycles be arbitrary square wave W3, the output frequency of port 3 of the Jing signal conversion circuits 22 sine wave W4 connecting wire equal with F2 finally enters the port 2 of base signal conversion circuit 12.
So, signal conversion circuit 12 is superimposed by sine wave W2 with sine wave W4 inputs, Jing signals conversion module 12 produces the square wave that frequency is fixed, feedback signal detection module 13 can detect current waveform state, judge single line successful connection, the feedback signal detection module 13 of base judges that current state is State2.
Due to inductive head it is identical with the circuit of base, therefore the input waveform of signal conversion circuit 22 is also to be superimposed by sine wave W2 and sine wave W4, again Jing signal conversion circuits 22 are produced with the identical square wave of signal conversion circuit 12 to feedback signal detection module 23, judge that current state is State2.
When solid conductor 3 disconnects, the feedback signal detection module 13,23 of inductive head and base judges that current form state is all changed into state1, so as to the two-way detection for realizing breaking.
Above-mentioned signal generating source module and feedback signal detection module can realize two kinds of functions by a MCU or control chip, or two different MCU control chips realize that respectively signal occurs and feedback model detection.
W2 is superimposed the frequency of the regular square wave for producing with W4:Work as F1>During F2, F3=F1-F2；Work as F2>During F1, F3=F2-F1.
With reference to Fig. 4,5.The signal conversion circuit of base and waveform change general introduction：
The frequency exported by the 16th foot WAVE_OUT of master chip MCU is the square wave W1 Jing inductance L1 and electric capacity C30 resonance of F1, forms sine wave W2.Sine wave W2 point is two-way, all the way Jing WAVE_CM ports, the WAVE_CM ports of the output of wire 3 to inductive head, meanwhile, base WAVE_CM ports Jing wire 3 receives the sine wave W4 from inductive head WAVE_CM ports.
Another road sine wave W2, together with the sine wave W4 for receiving, Jing diode D5 one-way commutation diodes, removes the negative half period of sine wave, obtains the blank waveform of difference frequency.Because now positive half cycle waveforms amplitude is too high, Jing electric capacity C28 realize that amplitude is reduced, and waveform is designated as T1.Ripple T1 is so through the waveform point two-way output of amplitude transformation.The road Jing electric capacity C24 of waveform T1 mono-, resistance R31 couple output waveform T2, and waveform T2 point is two-way, is coupled to all the way on the 3rd foot of voltage follower U3A.Another road Jing resistance R32 are connected to the 12nd foot of U3D, Jing after voltage follower U3D impedances R27, R30 matching, output waveform T3.Waveform T1 is coupled on another road on the 2nd foot of voltage follower U3A, with the T2 waveforms on the 3rd foot of voltage follower U3A, Jing after operational amplifier U3A impedance matchings, Jing after resistance R28 is connected to the two-stage impedance matching circuit being made up of resistance R24, voltage follower U3B, electric capacity C16, electric capacity C18, resistance R25, electric capacity C17, resistance R26, electric capacity C23, voltage follower U3C, final waveform output is connected to coupled capacitor C22, Jing C22 and R27, integrate with T2 waveforms, finally obtain meeting the difference frequency square wave of the W2 and W4 of demand in WAVE_OT feet.Wave_OT feet must have pull-up resistor, and this pull-up resistor can be built in or beyond the pin of feedback detection module and add, and to realize normal high level output, the waveform that WAVE_OT feet are produced is judged by feedback signal detection module.This circuit need to pass through regulation different electric capacity, resistance, inductance value etc. and realize functional trimming, all to meet figure device principle figure connection such as（Device value is not considered）, all think substantive, the scope for belonging to signal conversion circuit.
Other circuit modules of base：
Master chip U5, input module switch, bar magnet receiver module, audible alarm module, LED indicating module, battery low-voltage detection module, external power supply detection module, external power supply power module of voltage regulation, super-charge super-discharge electric protection module, charge control module, the rechargeable battery 7 being connected on master chip U5.
Input module switch, connection inductive head switch, to the USB connecting lines charged by protection commodity, after master chip U5 detects inductive head on off state to change, or, USB connecting lines disconnect when, master chip U5 report to the police；
Bar magnet receiver module, for receiving the password from remote control, to master chip U5 password is arranged, releases and report to the police（The password stored in verification master chip U5 and the password from remote control, if unanimously, with regard to stop alarm）；
Audible alarm module, LED indicating module, after base switch, inductive head switch, wire disconnect or the USB line powered to commodity disconnects, master chip U5 can trigger audible alarm module, LED indicating module and be reported to the police.
Battery low-voltage detection module, for detecting the voltage of DC source, when DC source is detected less than a certain limit value, LED indicating module carries out prompting and is charged.
External power supply detection module, for detecting whether external power supply, if can detect, just by being powered to each module after external power supply rectifying and voltage-stabilizing.
External power supply power module of voltage regulation, for giving external power supply rectifying and voltage-stabilizing.
Super-charge super-discharge electric protection module, prevents over-charging of battery, battery of being rivals in a contest excessively from causing to damage.
Charge control module, controls charging current, with prevent charging current it is excessive cause to be not fully filled, electric current is too small causes the charging interval long.
Battery low-voltage detection module, external power supply detection module, external power supply power module of voltage regulation, super-charge super-discharge electric protection module, charge control module belong to charging circuit.
In goods display antitheft apparatus, inductive head is separably shelved on base；External charge power port on base is positive pole port VIN1, GND1, cable 5 is drawn from external charge positive source port VCC5.0, cable 5 is connected with the external charge positive source port VCC5.0 of inductive head, cable 6 is drawn from external charge power ground port GND1, cable 6 is connected with external power supply grounding ports GND1 of inductive head, cable 5, the middle setting contact switch 4 of cable 6, when inductive head is shelved on base, contact switch 4 is connected, external charge power supply passes through cable 5, cable 6 charges to inductive head, when inductive head leaves base, contact switch 4 disconnects, external charge power supply cannot pass through cable 5, cable 6 charges to inductive head.
The principle of inductive head circuit and base circuit and to be connected be identical.
The specific embodiment of the present invention is the foregoing is only, but the architectural feature of the present invention is not limited thereto, and any those skilled in the art in the field of the invention, all cover among protection scope of the present invention by the change or modification made.
Claims (5)
1. a kind of anti-theft device for commodities, including the first main body and the second main body, first main body and the second main body are respectively arranged with shell, it is characterized in that first main body and the second main body are provided with anti-theft warning circuit, connected by solid conductor between first main body and the anti-theft warning circuit of the second main body；
Feedback signal detection module, signal generating source module, signal conversion circuit are respectively provided with the anti-theft warning circuit of the first main body and the second main body, the solid conductor is connected between the port of the signal conversion circuit of the signal conversion circuit port of the first main body and the second main body；
In first main body, signal generating source module is used to send frequency for first frequency F1, the arbitrary square wave W1 of dutycycle, signal conversion module is used to for square wave W1 to be transformed to primary sinusoid W2 that generation rule, frequency are first frequency F1, solid conductor described in primary sinusoid W2 Jing inputs to the signal conversion circuit of the second main body, the detection output of feedback signal detection module；
In second main body, signal generating source module is used to send frequency for second frequency F2, the arbitrary square wave W3 of dutycycle, signal conversion module is used to for square wave W3 to be transformed to the second sine wave W4 that generation rule, frequency are first frequency F1, solid conductor described in second sine wave W4 Jing inputs to the signal conversion circuit of the first main body, the detection output of feedback signal detection module；
The signal conversion module of the first main body is additionally operable to be overlapped primary sinusoid W2 and the second sine wave W4, and the signal conversion module of the second main body is also additionally operable to be overlapped primary sinusoid W2 and the second sine wave W4；
The signal of the signal conversion module that the feedback signal detection module in first main body is used in the first main body of detection, the signal of the signal conversion module that the feedback signal detection module in the second main body is used in the second main body of detection.
2. a kind of anti-theft device for commodities as claimed in claim 1, it is characterised in that first main body is the base in commodity anti-theft exhibiting device, and second main body is the inductive head in commodity anti-theft exhibiting device.
3. a kind of anti-theft device for commodities as claimed in claim 1, it is characterized in that the signal generating source module and feedback signal detection module of the first main body can be realized the function of both by microprocessor or integrated circuit, the signal generating source module and feedback signal detection module of the second main body can also be realized the function of both by microprocessor or control chip.
4. a kind of anti-theft device for commodities as claimed in claim 1, it is characterised in that one of main body of the first main body and the second main body is separably shelved in another main body；
Rechargeable battery and charging circuit are both provided with described two main bodys, contact switch is set between two main bodys, during so that one of main body is shelved in described another main body, described another main body can charge to one of main body, when one of main body leaves described another main body, described another main body can not charge to one of main body.
5. a kind of anti-theft device for commodities as described in claim 1,2,3 or 4, it is characterized in that, at least provided with the one kind in voice guard and light-emitting alarm in the first main body and the second main body, voice guard and light-emitting alarm are in anti-theft warning circuit, and are connected with microprocessor or control chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510706864.XA CN106611466B (en) | 2015-10-27 | 2015-10-27 | A kind of anti-theft device for commodities |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510706864.XA CN106611466B (en) | 2015-10-27 | 2015-10-27 | A kind of anti-theft device for commodities |
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| CN106611466A true CN106611466A (en) | 2017-05-03 |
| CN106611466B CN106611466B (en) | 2019-02-01 |
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| CN201510706864.XA Active CN106611466B (en) | 2015-10-27 | 2015-10-27 | A kind of anti-theft device for commodities |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109671237A (en) * | 2019-02-22 | 2019-04-23 | 深圳亿东科技股份有限公司 | A kind of commodity anti-theft method and the commodity anti-theft alarm based on this method |
| WO2022170685A1 (en) * | 2021-02-09 | 2022-08-18 | 格美特智能电子科技(昆山)有限公司 | Commodity anti-theft device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101849250A (en) * | 2007-09-28 | 2010-09-29 | 检查站系统股份有限公司 | Coiled cable display device |
| JP4768895B1 (en) * | 2010-09-17 | 2011-09-07 | 株式会社エスキューブ | Crime prevention system |
| US20110283754A1 (en) * | 2010-05-24 | 2011-11-24 | Checkpoint Systems, Inc. | Security device for ring products |
| CN202331692U (en) * | 2011-10-28 | 2012-07-11 | 上海锦为网络科技有限公司 | Anti-theft device for displaying and experiencing cell phone or digital product |
| CN203102498U (en) * | 2013-02-19 | 2013-07-31 | 昆山禾讯电子科技有限公司 | Novel antitheft exhibition rack |
| CN104574738A (en) * | 2013-10-18 | 2015-04-29 | 天津市雅铁科贸有限公司 | Mobile phone pickproof display stand |
-
2015
- 2015-10-27 CN CN201510706864.XA patent/CN106611466B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101849250A (en) * | 2007-09-28 | 2010-09-29 | 检查站系统股份有限公司 | Coiled cable display device |
| US20110283754A1 (en) * | 2010-05-24 | 2011-11-24 | Checkpoint Systems, Inc. | Security device for ring products |
| JP4768895B1 (en) * | 2010-09-17 | 2011-09-07 | 株式会社エスキューブ | Crime prevention system |
| CN202331692U (en) * | 2011-10-28 | 2012-07-11 | 上海锦为网络科技有限公司 | Anti-theft device for displaying and experiencing cell phone or digital product |
| CN203102498U (en) * | 2013-02-19 | 2013-07-31 | 昆山禾讯电子科技有限公司 | Novel antitheft exhibition rack |
| CN104574738A (en) * | 2013-10-18 | 2015-04-29 | 天津市雅铁科贸有限公司 | Mobile phone pickproof display stand |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109671237A (en) * | 2019-02-22 | 2019-04-23 | 深圳亿东科技股份有限公司 | A kind of commodity anti-theft method and the commodity anti-theft alarm based on this method |
| WO2022170685A1 (en) * | 2021-02-09 | 2022-08-18 | 格美特智能电子科技(昆山)有限公司 | Commodity anti-theft device |
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