WO1993010514A1 - Procede d'activation et de desactivation d'etiquettes et appareil pour activer et desactiver ces etiquettes - Google Patents

Procede d'activation et de desactivation d'etiquettes et appareil pour activer et desactiver ces etiquettes Download PDF

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Publication number
WO1993010514A1
WO1993010514A1 PCT/DK1992/000330 DK9200330W WO9310514A1 WO 1993010514 A1 WO1993010514 A1 WO 1993010514A1 DK 9200330 W DK9200330 W DK 9200330W WO 9310514 A1 WO9310514 A1 WO 9310514A1
Authority
WO
WIPO (PCT)
Prior art keywords
deactivation
activation
resonant circuit
high tension
tags
Prior art date
Application number
PCT/DK1992/000330
Other languages
English (en)
Inventor
Poul Richter JØRGENSEN
Original Assignee
Joergensen Poul Richter
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.)
Filing date
Publication date
Application filed by Joergensen Poul Richter filed Critical Joergensen Poul Richter
Publication of WO1993010514A1 publication Critical patent/WO1993010514A1/fr

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR 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 of activation and deactivation of tags comprising resonant circuits and to an apparatus for activating and deactivating said tags.
  • Such systems usually include the production of an electromagnetic field in a supervised area through which the mentioned objects are to be transported.
  • a tag having one or several coil(s) and capacitor(s) integrated in resonant circuits is attached to the object.
  • the resonant circuit placed on the tag shall be destroyed in a manner to avoid the release of an alarm signal. Such a destruction can be carried out mechanically, but this is difficult and timeconsuming.
  • DK Patent Application No. 2796/90 discloses how reso ⁇ nant circuits for tags can be produced with a very precise thickness in areas of the dielectric medium used in the capacitor of such circuits.
  • US Patent Specification No. 4.498.076 and European Patent Specification No. 235.559 disclose a method of deac ⁇ tivation of tags of the kind disclosed here, where the des ⁇ truction of the resonant circuit on the tag is carried out by emitting electromagnetic fields from a radio transmitter, in as much as the emission takes place at frequencies within a frequency interval comprising the resonant frequency of the resonant circuit.
  • the resonant circuit of the tag can be destroyed, for example by short-circuiting the capacitor of the resonant circuit where regions can be provided in which the capacitor plates are particularly close to each other.
  • the tag In dependence on the magnitude of the emitted power, the tag can be deactivated within a given distance from the antenna of the deactivation transmitter, but there are limi- . tations for the magnitude of the power to be emitted by the transmitter in order to avoid undesired impact on the trans ⁇ mitter-receiver of the supervisory equipment. Furthermore, the power is limited by the existing legislation. In spite of these limitations, there has to be emitted such a high power that known systems of this kind are depending on energy supply from the common electrical distribution network, and therefore, the deactivation systems are fixed stationary systems.
  • a receiver is integrated in the known deactivation systems by means of which it may be controlled whether the resonant circuit on the tag has been deactivated after having passed the deactivation system.
  • the location of the deactivation system may also cause problems if the supervisory equipment is too close to the deactivation system, it has to be synchronized with it and this is expensive.
  • a resonant circuit could be solidly in ⁇ serted during the binding step, said resonant circuit only becoming active within the frequency range used to the super ⁇ vision after the initiation of an activation process.
  • a resonant circuit on a tag which can be activated can be produced in such a manner that a conductive path between the capacitor and the coil is cut off but that the galvanic connection between the capacitor and the coil is brought about by short-circuiting between the two parts of the disconnected conductive path which in the beginning were isolated from each other in the same manner as while deactivating the resonant circuit.
  • the power neccessary to activate the resonant circuit may, however, be lower than the power necessary to deactivation, and this can be realized by the fact that the insulating layer between the two parts of the disconnected conductive path is thinner than the dielectric medium in the capacitor at selected short-circui- ting spots.
  • the invention brings about a method and an apparatus for carrying out the method wich
  • - is operating without energy supply from the elec— trical distribution network or from big stationary battery installations, - is mobile,
  • FIG. 1 schematically shows the method of activa ⁇ tion/deactivation of a resonant circuit according to the invention
  • Fig. 2 schematically shows selected breakdown regions in a capacitor
  • Figs. 3A, 3B, 4A, 4B and 5 show examples of known circuits for electronic production of high tension pulses.
  • Fig. 1 shows a resonant circuit of the kind used in connection with the tags disclosed.
  • the shown capacitor and the shown coil represent the total capacity, respectively the total self-induction of the circuit.
  • electrodes from the high tension unit of the ac ⁇ tivation/deactivation unit are conducted to the tag and thus, by means of contact or at a small distance from the tag, a high tension pulse is transmitted to the resonant circuit.
  • Fig. 2 shows, on a larger scale, two capacitor plates in a resonant circuit of the kind disclosed where the dielec ⁇ tric medium in two regions has a smaller thickness than the dielectric medium outside these regions.
  • Such regions can be brought about with high precision so that the thickness of the dielectric medium in the one region for example is about 1 ⁇ m and in the other region for example 3 ⁇ m.
  • the tension necessary to cause breakdown at a given thickness of the dielectric medium is well-defined for a given dielec ⁇ tric medium and thus, it is possible in the capacitor shown in Fig. 2 to provoke a breakdown at spot 1, without any breakdown taking place at spot 2 where the dielectric medium has a bigger thickness than at spot 1.
  • Such a method can, for example, be used when a reso- nant circuit first shall be activated and afterwards deac ⁇ tivated, as explained before, as the activation then can take place at a lower tension than the deactivation.
  • Figs. 3A and B, Figs. 4A and B and Fig. 5 are examples for diagrams of known electronic circuits to produce high tension pulses.
  • the shown circuits get their energy supply from dry cell batteries, and they are all connected with the primary of a transformer, and the high tension pulse is supplied by the secondary.
  • Fig. 3A requires quite much current and is hardly preferred for the present use, while the re ⁇ maining circuits all can be used.
  • circuits having other configurations than the shown ones may also be used in con ⁇ nection with the present invention.
  • Anactivation/deactivationapparatus compriseswhether at least one electronic circuit to produce high tension pulses and a region for inserting dry cell batteries, or at least one piezoelectric unit.
  • the apparatus shall be provided with sui ⁇ table switches/interrupters, and when using piezoelectric crystals, with devices for mechanical impact on the piezo ⁇ electric units.
  • the apparatus is provided with a plurality of electrodes which are connected with the secondary of the transformer, respectively with the piezoelectric unit so that the contact with the tag can take place in a suitable manner.

Landscapes

  • 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)
  • Semiconductor Integrated Circuits (AREA)

Abstract

Des étiquettes comportant des circuits de résonance sont activées et désactivées en court-circuitant une ligne de courant interrompue ou en provoquant un court-circuit entre deux plaques d'un condensateur, respectivement, pour autant que le matériau diélectrique dans des zones spéciales ait une épaisseur plus petite qu'en dehors de ces zones. L'énergie nécessaire pour provoquer le court-circuit est générée par la décharge d'une impulsion de haute tension.
PCT/DK1992/000330 1991-11-14 1992-11-10 Procede d'activation et de desactivation d'etiquettes et appareil pour activer et desactiver ces etiquettes WO1993010514A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1864/91 1991-11-14
DK186491A DK167829B1 (da) 1991-11-14 1991-11-14 Fremgangsmaade og apparat til aktivering og deaktivering af maerkesedler

Publications (1)

Publication Number Publication Date
WO1993010514A1 true WO1993010514A1 (fr) 1993-05-27

Family

ID=8108629

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1992/000330 WO1993010514A1 (fr) 1991-11-14 1992-11-10 Procede d'activation et de desactivation d'etiquettes et appareil pour activer et desactiver ces etiquettes

Country Status (2)

Country Link
DK (1) DK167829B1 (fr)
WO (1) WO1993010514A1 (fr)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153852A (en) * 1976-01-29 1979-05-08 Vainer Ernesto A Compact piezoelectric lighter for gas fixtures
US4574274A (en) * 1982-08-09 1986-03-04 Sensormatic Electronics Corporation Non-contact electrostatic deactivator
EP0215605A2 (fr) * 1985-09-09 1987-03-25 Minnesota Mining And Manufacturing Company Etiquette RF réactivable
US4689636A (en) * 1985-03-15 1987-08-25 Minnesota Mining And Manufacturing Company Deactivatable resonant marker for use in RF electronic article surveillance system
US4744423A (en) * 1986-03-26 1988-05-17 Tri Square Industrial Co., Ltd. Piezoelectric high voltage impact mechanism
EP0287905A1 (fr) * 1987-04-23 1988-10-26 Actron Entwicklungs AG Procédé pour désactiver une étiquette résonante et circuit de mise en oeuvre du procédé
CH672854A5 (en) * 1987-03-01 1989-12-29 Scanmatic Security Systems Ag Security tag for controlled access to building - has LC circuit with capacitor set to valve by burn in at specific location
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
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
EP0463233A2 (fr) * 1990-06-27 1992-01-02 Checkpoint Systems, Inc. Etiquette de sécurité activable/déactivable pour l'emploi dans un système électronique de sécurité
WO1992009978A1 (fr) * 1990-11-23 1992-06-11 Joergensen Poul Richter Procede de fabrication d'etiquettes comprenant des circuits a resonance pouvant etre actives et desactives

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153852A (en) * 1976-01-29 1979-05-08 Vainer Ernesto A Compact piezoelectric lighter for gas fixtures
US4574274A (en) * 1982-08-09 1986-03-04 Sensormatic Electronics Corporation Non-contact electrostatic deactivator
US4689636A (en) * 1985-03-15 1987-08-25 Minnesota Mining And Manufacturing Company Deactivatable resonant marker for use in RF electronic article surveillance system
EP0215605A2 (fr) * 1985-09-09 1987-03-25 Minnesota Mining And Manufacturing Company Etiquette RF réactivable
US4744423A (en) * 1986-03-26 1988-05-17 Tri Square Industrial Co., Ltd. Piezoelectric high voltage impact mechanism
CH672854A5 (en) * 1987-03-01 1989-12-29 Scanmatic Security Systems Ag Security tag for controlled access to building - has LC circuit with capacitor set to valve by burn in at specific location
EP0287905A1 (fr) * 1987-04-23 1988-10-26 Actron Entwicklungs AG Procédé pour désactiver une étiquette résonante et circuit de mise en oeuvre du procédé
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
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
EP0463233A2 (fr) * 1990-06-27 1992-01-02 Checkpoint Systems, Inc. Etiquette de sécurité activable/déactivable pour l'emploi dans un système électronique de sécurité
WO1992009978A1 (fr) * 1990-11-23 1992-06-11 Joergensen Poul Richter Procede de fabrication d'etiquettes comprenant des circuits a resonance pouvant etre actives et desactives

Also Published As

Publication number Publication date
DK186491D0 (da) 1991-11-14
DK167829B1 (da) 1993-12-20
DK186491A (da) 1993-05-15

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