EP0287905A1 - Procédé pour désactiver une étiquette résonante et circuit de mise en oeuvre du procédé - Google Patents

Procédé pour désactiver une étiquette résonante et circuit de mise en oeuvre du procédé Download PDF

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Publication number
EP0287905A1
EP0287905A1 EP88105582A EP88105582A EP0287905A1 EP 0287905 A1 EP0287905 A1 EP 0287905A1 EP 88105582 A EP88105582 A EP 88105582A EP 88105582 A EP88105582 A EP 88105582A EP 0287905 A1 EP0287905 A1 EP 0287905A1
Authority
EP
European Patent Office
Prior art keywords
pulse
circuit
discharge
resonance
receiving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88105582A
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German (de)
English (en)
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EP0287905B1 (fr
Inventor
Jürgen Dipl.-Phys. Rehder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Actron Entwicklungs AG
Original Assignee
Durgo AG
Actron Entwicklungs AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Durgo AG, Actron Entwicklungs AG filed Critical Durgo AG
Priority to AT88105582T priority Critical patent/ATE86403T1/de
Publication of EP0287905A1 publication Critical patent/EP0287905A1/fr
Application granted granted Critical
Publication of EP0287905B1 publication Critical patent/EP0287905B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2414—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
    • G08B13/242—Tag deactivation

Definitions

  • the invention relates to a method according to the preamble of claim 1 and to a circuit arrangement for performing the method.
  • resonance labels are attached to the goods to protect them against theft, which must be deactivated when paying at the cash desk, but possibly also after showing the cash receipt confirmation when the goods are picked up at the packing table. If a label is not deactivated, this can be recognized by a monitoring system arranged in the exit area, which stimulates the labels to resonate and detects a label that has not been deactivated on the resonance.
  • the deactivation takes place conventionally by excitation of the label with about ten times the power, which leads to the burning of the resonant circuit or its capacitor.
  • the high current surge can also trigger an alarm at the exit of the department store, especially if the cash register is located close enough. This risk can only be eliminated by expensive circuitry measures.
  • Another difficulty is that such a high performance of a broadcaster (and this is what it is here for) requires the approval of the postal authority and it is difficult (or not at all) to obtain it.
  • this means that the monitoring device is ultimately switched off more than switched on, so that under certain circumstances a thief with stolen goods can still slip through.
  • the invention is based on the object of designing a method of the type mentioned at the outset and an associated circuit arrangement in such a way that the resonance labels can be checked or deactivated without interference.
  • a first step towards solving this task is the realization that the resonance frequency does not need to be released to deactivate the label, but that, with the appropriate strength, a single click pulse is sufficient to excite the resonant circuit of the label to self-destruct.
  • the term "cracking disorder" is common in a telephone line; a single pulse from such an interference signal is therefore a click pulse.
  • the procedure according to claim 3 can be followed, the label then being deactivated by a further pulse if this should not be the case with the first pulse.
  • it can also be carried out according to claim 4, it being preferred to combine the two procedures by emitting at least one second discharge pulse, which may then also be used for checking.
  • a circuit arrangement for carrying out the method according to the invention is characterized by the features of claim 5.
  • a goods provided with a resonance label E are either brought to the cash register or are collected from a packing table after payment at the cash register.
  • the resonance label E must be deactivated, which is initiated by actuating a switching element.
  • This switching element can simply be manually, e.g. by the cashier to be operated, but is preferably formed by a sensor LDR, which automatically detects the passage of the goods and activates the deactivation circuit.
  • the sensor LDR is formed by a light barrier or a light reflector with a photoelectric converter LDR, but various configurations are possible, for example a piezosensor that detects the weight of the goods on a base or a circle that simulates the inspection circuit at the department store exit, the one Sends out resonance vibration and uses the "echo" of the label E to determine its presence.
  • An amplifier 1 is connected downstream of the sensor LDR, in particular one with a large gain, such as a threshold switch, which converts the voltage change at the output of the sensor LDR into a voltage step. From this step signal, a timing element 2, in particular a monoflop, is triggered, possibly via a coupling capacitor which supplies a needle pulse, which keeps a downstream OR gate 3 open for a predetermined time.
  • a pulse generator 4 is switched on via the OR gate 3 switches, which emits at least two, preferably more, pulses with interposed pulse pauses.
  • the pulse pause times are preferably a multiple of the pulse times.
  • the pulse sequence delivered in this way serves a dual purpose, namely on the one hand to ensure the destruction of the resonance tag E (if this is not already possible with the first pulse) and on the other hand to check the success of the destruction. Since the lowest possible energy is used, the destruction can fail if the label E is placed on a very large piece of goods at a location distant from the transmitting antenna L1, for example on the underside.
  • a voltage converter 6 charges a capacitor C1 via a resistor R1.
  • a resistor is referred to here, then it is understood to mean any circuit which results in a current resistor.
  • transistors can also be operated as variable resistors.
  • the capacitor C1 is connected to ground via a controllable switch 5, the switch 5 being closed by the pulses from the pulse generator 5. It is therefore understood that the pulse pause times are to be dimensioned such that the capacitor C1 can be recharged by the voltage converter 6 during this time.
  • the timer 2 operates here to a certain extent as a gate circuit for determining the Number of pulses to be output by the pulse generator 4. It would therefore be readily possible to place a gate circuit at the output of a free-running pulse generator 4 and to pass pulses only during a predetermined time. It would also be conceivable to design the pulse generator 4 as a start-stop generator instead of the timing element 2, said generator generating a predetermined number of pulses after being triggered by the pulse from the amplifier 1.
  • the ratio of pulse to pause time can advantageously be of the order of 1: 10000.
  • the pulse pause times between the pulses of the pulse generator 4 will be discussed again. Normally, the pause times on such a generator are always the same, and the pulses occur periodically. However, this means that the pulses are emitted at a predetermined frequency. This can be a disadvantage for the present purposes if interference is to be expected from such a frequency. It is therefore expedient to make the pulse pause times uneven by switching the pulse generator 4 accordingly. This can either be done in such a way that they are determined by a connected or integrated random generator, or - as is preferred - that they are changed according to a predetermined law, i.e. either lengthened or shortened after each pulse, the extent of this change remaining constant or can be variable.
  • the receiving and test antenna L2 can be arranged together with the transmitting antenna L1.
  • the transmitting antenna L1 at the cash register and the test antenna L2 at the packing table can also be provided.
  • a procedure can also be adopted, as is known from radar and echo sounder technology, in that one and the same antenna is used by switching once as a transmitting antenna and then again as a receiving antenna.
  • this is generally not preferred for the present purposes, as will be explained below.
  • the relatively strong discharge pulse of capacitor C1 will generally require limiting measures to protect the receiving circuit.
  • the number of turns times the area product should be of the same size, but connected in series with the opposite polarity, so that the voltage induced by the excitation coil L1 is compensated to a first approximation.
  • the coil L1 when assembling the antenna coils L1, L2, it would be possible to design the coil L1 as a rectangle, in which the receiving coil L2 (as shown) is installed as a symmetrical "8".
  • this limiting circuit contains a limiting transformer T, which is preferably designed as a symmetrical ferrite transformer, in particular a relatively small magnetic cross section. This measure alone leads to a first safe limitation and thus to protection of the downstream receiving circuit, because in addition to any down-transformation, the saturation of the ferrite core (which is relatively small in relation to the signal) constitutes a further limitation of the signal emitted.
  • a center tap is provided on the secondary side of the transformer T, which is connected to ground.
  • An alternative or additional measure can consist in the arrangement (provided on the output side of the ferrite transformer T) of a diode circuit D with diodes connected in parallel with the anit. Silicon diodes or a low junction capacitance are preferred. It would also be possible to use Schottky diodes, which are correspondingly fast, but they are more expensive than the silicon diodes mentioned.
  • the circuit 7 has an amplifier A, which is expediently designed as a, in particular fully symmetrical, push-pull amplifier. This is also a protective measure by which common-mode interference signals, in particular capacitively transmitted to the receiving antenna L2, are effectively suppressed. At the same time, the cross-modulation products that occur in the event of overmodulation are reduced.
  • a simple measure to circumvent this difficulty is that a timer 8 is in the receiving circuit, which switch 8 only closes the receiving circuit a predetermined time after the discharge pulse has been emitted via the antenna L1.
  • this presupposes that the transmitting and receiving circuit are synchronized with one another, ie that the switch 8 is controlled by the transmitting circuit.
  • the control input of the switch 8 connected to the switching element LDR, 1-5 discharging the capacitor C1.
  • the control line 13 could be connected directly to the circuit of the capacitor C1 or to the switch 5, but this is generally not preferred for dimensional reasons. It is more favorable to connect the control line to the output of the pulse generator 4 (or one of the equivalent circuits mentioned above).
  • the delay time after the discharge pulse is emitted until the switch 8 closes is determined by a timer integrated in the switch 8, for example a monoflop, but the timer or monoflop can also be provided separately in line 13.
  • the delay time is at least 2 ⁇ s, but must not be too long. A range of 5 to 50 ⁇ s should be optimal. Subsequently, the switch 8 should not remain open too long in order to exclude interference signals as far as possible. An open time of 10 ⁇ s to a maximum of 60 ⁇ s, preferably a maximum of 50 ⁇ s, is entirely satisfactory.
  • the above-mentioned predetermined passes until the closing of the switch 8 , Time. This time is chosen such that the interference vibrations generated in the system by the excitation pulse from the antenna L1 have decayed to such an extent that a signal originating from a label E which has remained undamaged at any rate can be recorded significantly.
  • the switch 8 If the switch 8 is closed and the receiving antenna L2 receives a ringing from an undamaged label E, these oscillations are expedient integrated in an integrator 9. This may also be protection against interference frequencies, because the integrator 9 is preferably followed by a threshold switch 10, so that a few interference vibrations are not sufficient to exceed the switching threshold of the threshold switch 10.
  • the switch 10 serves as a comparator with a predetermined value, namely its threshold value, which can be set via an adjusting resistor (not shown).
  • integrator 9 and threshold switch 10 form the detection circuit for a resonance tag E that has remained capable of vibration.
  • the detection circuit can be constructed in any way, as is known from radio and radar technology.
  • At the output of this detection circuit there is a corresponding evaluation circuit, which is designed either as a pure display with an acoustic display device 11 and / or a visual display device 12, so that the cashier is made aware, for example, that the deactivation process must be repeated.
  • the evaluation circuit can also have a signal line 14 in the manner also shown for automating the new deactivation process, which feeds a signal to the switching element LDR, 1-5, which discharges the capacitor C1, for a new start-up.
  • the switching element LDR, 1-5 can be implemented in very different ways, and accordingly the output line 14 can also trigger a new switching operation at different points.
  • the output line 14 can also trigger a new switching operation at different points.
  • any other energy source of corresponding strength can be used instead of a capacitor C1.
  • the described deactivation test with the receiving circuit L2, 7-12 could also be carried out in a conventional manner, in particular if the test is carried out at a different location, e.g. at the packing table, is made as the deactivation.
  • the advantages achieved by the invention such as speed, etc., are lost when working with frequencies that are matched as precisely as possible.
  • a further modification possibility is given at the receiving antenna L2, which is practically designed in the manner of a compensation variometer and can accordingly take all forms known for this design.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Labeling Devices (AREA)
EP88105582A 1987-04-23 1988-04-08 Procédé pour désactiver une étiquette résonante et circuit de mise en oeuvre du procédé Expired - Lifetime EP0287905B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88105582T ATE86403T1 (de) 1987-04-23 1988-04-08 Verfahren zum deaktivieren einer resonanzetikette und schaltungsanordnung zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH156487 1987-04-23
CH1564/87 1987-04-23

Publications (2)

Publication Number Publication Date
EP0287905A1 true EP0287905A1 (fr) 1988-10-26
EP0287905B1 EP0287905B1 (fr) 1993-03-03

Family

ID=4213376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105582A Expired - Lifetime EP0287905B1 (fr) 1987-04-23 1988-04-08 Procédé pour désactiver une étiquette résonante et circuit de mise en oeuvre du procédé

Country Status (6)

Country Link
US (1) US4906974A (fr)
EP (1) EP0287905B1 (fr)
JP (1) JP2575173B2 (fr)
AT (1) ATE86403T1 (fr)
DE (1) DE3878717D1 (fr)
ES (1) ES2039005T3 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5027106A (en) * 1989-12-27 1991-06-25 Checkpoint Systems, Inc. Method and apparatus for electronic article surveillance
WO1991009387A1 (fr) * 1989-12-20 1991-06-27 Actron Entwicklungs Ag Etiquette a resonance desactivable
EP0439237A1 (fr) * 1990-01-25 1991-07-31 N.V. Nederlandsche Apparatenfabriek NEDAP Méthode et dispositif pour désactiver des étiquettes de détection électromagnétiques
EP0454021A1 (fr) * 1990-04-25 1991-10-30 Actron Entwicklungs AG Procédé pour désactiver une étiquette résonante et circuit de mise en oeuvre du procédé
EP0478092A1 (fr) * 1990-09-28 1992-04-01 N.V. Nederlandsche Apparatenfabriek NEDAP Dispositif de désactivation
FR2669756A1 (fr) * 1990-11-23 1992-05-29 Cga Hbs Systeme pour l'enregistrement et l'invalidation de l'identification d'un produit.
EP0499582A1 (fr) * 1991-02-12 1992-08-19 Actron Entwicklungs AG Dispositif pour la déactivation d'étiquettes résonantes
WO1993010514A1 (fr) * 1991-11-14 1993-05-27 Joergensen Poul Richter Procede d'activation et de desactivation d'etiquettes et appareil pour activer et desactiver ces etiquettes
US5257010A (en) * 1990-04-25 1993-10-26 Actron Entwicklungs Process for the deactivation of a reasonance label and circuit arrangement for the execution of the process
NL1002150C2 (nl) * 1996-01-23 1997-07-25 Nedap Nv Deactiveersysteem met verbeterde betrouwbaarheid.
WO2002005238A3 (fr) * 2000-07-07 2002-04-11 3M Innovative Properties Co Dispositif permettant de changer l'etat de marqueurs de surveillance electronique d'articles a deux etats
US6778087B2 (en) 2001-06-15 2004-08-17 3M Innovative Properties Company Dual axis magnetic field EAS device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4015779A1 (de) * 1990-05-16 1991-11-21 Minnesota Mining & Mfg Verfahren zur verwendung mit einem dazu passenden ueberwachungssystem fuer gegenstaende zur feststellung und magnetisierung eines magnetischen markierungselements und vorrichtung zur durchfuehrung des verfahrens
US5805065A (en) * 1991-05-08 1998-09-08 Minnesota Mining And Manufacturing Company Electro-magnetic desensitizer
NL9202067A (nl) * 1992-11-27 1994-06-16 Dutch A & A Trading Bv Detectielabel.
ES2152152B1 (es) * 1998-05-22 2001-08-01 El Corte Ingles S A Controlador de etiquetas de seguridad utilizadas en la comercializacion de mercancias.
GB2500134B (en) * 2009-12-08 2014-02-12 Redcliffe Magtronics Ltd Hand-held tag detector

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938044A (en) * 1973-11-14 1976-02-10 Lichtblau G J Antenna apparatus for an electronic security system
WO1985004975A1 (fr) * 1982-05-10 1985-11-07 Arthur D. Little, Inc. Etiquette resonante et desactivateur utilises dans un systeme de securite electronique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4686516A (en) * 1984-11-26 1987-08-11 Sensormatic Electronics Corporation Method, system and apparatus for use in article surveillance
US4736207A (en) * 1986-01-31 1988-04-05 Sensormatic Electronics Corporation Tag device and method for electronic article surveillance
CH677988A5 (fr) * 1986-07-30 1991-07-15 Actron Entwicklungs Ag

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938044A (en) * 1973-11-14 1976-02-10 Lichtblau G J Antenna apparatus for an electronic security system
WO1985004975A1 (fr) * 1982-05-10 1985-11-07 Arthur D. Little, Inc. Etiquette resonante et desactivateur utilises dans un systeme de securite electronique

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991009387A1 (fr) * 1989-12-20 1991-06-27 Actron Entwicklungs Ag Etiquette a resonance desactivable
EP0435538A3 (en) * 1989-12-27 1992-09-23 Checkpoint Systems, Inc. Method and apparatus for electronic article surveillance
US5027106A (en) * 1989-12-27 1991-06-25 Checkpoint Systems, Inc. Method and apparatus for electronic article surveillance
EP0439237A1 (fr) * 1990-01-25 1991-07-31 N.V. Nederlandsche Apparatenfabriek NEDAP Méthode et dispositif pour désactiver des étiquettes de détection électromagnétiques
US5257010A (en) * 1990-04-25 1993-10-26 Actron Entwicklungs Process for the deactivation of a reasonance label and circuit arrangement for the execution of the process
EP0454021A1 (fr) * 1990-04-25 1991-10-30 Actron Entwicklungs AG Procédé pour désactiver une étiquette résonante et circuit de mise en oeuvre du procédé
EP0478092A1 (fr) * 1990-09-28 1992-04-01 N.V. Nederlandsche Apparatenfabriek NEDAP Dispositif de désactivation
FR2669756A1 (fr) * 1990-11-23 1992-05-29 Cga Hbs Systeme pour l'enregistrement et l'invalidation de l'identification d'un produit.
EP0499582A1 (fr) * 1991-02-12 1992-08-19 Actron Entwicklungs AG Dispositif pour la déactivation d'étiquettes résonantes
CH682265A5 (fr) * 1991-02-12 1993-08-13 Actron Entwicklungs Ag
WO1993010514A1 (fr) * 1991-11-14 1993-05-27 Joergensen Poul Richter Procede d'activation et de desactivation d'etiquettes et appareil pour activer et desactiver ces etiquettes
NL1002150C2 (nl) * 1996-01-23 1997-07-25 Nedap Nv Deactiveersysteem met verbeterde betrouwbaarheid.
EP0786749A1 (fr) * 1996-01-23 1997-07-30 N.V. Nederlandsche Apparatenfabriek NEDAP Dispositif de déactivation pour étiquette électronique antivol
WO2002005238A3 (fr) * 2000-07-07 2002-04-11 3M Innovative Properties Co Dispositif permettant de changer l'etat de marqueurs de surveillance electronique d'articles a deux etats
US6486782B1 (en) 2000-07-07 2002-11-26 3M Innovative Properties Device for changing the status of dual status magnetic electronic article surveillance markers
AU2001212106B2 (en) * 2000-07-07 2006-02-16 3M Innovative Properties Company Device for changing the status of dual status magnetic electronic article surveillance markers
US6778087B2 (en) 2001-06-15 2004-08-17 3M Innovative Properties Company Dual axis magnetic field EAS device

Also Published As

Publication number Publication date
EP0287905B1 (fr) 1993-03-03
JP2575173B2 (ja) 1997-01-22
ATE86403T1 (de) 1993-03-15
US4906974A (en) 1990-03-06
DE3878717D1 (de) 1993-04-08
ES2039005T3 (es) 1993-08-16
JPS63282900A (ja) 1988-11-18

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