EP0919049A1 - Circuit a resonance pour element antivol electronique - Google Patents

Circuit a resonance pour element antivol electronique

Info

Publication number
EP0919049A1
EP0919049A1 EP97936674A EP97936674A EP0919049A1 EP 0919049 A1 EP0919049 A1 EP 0919049A1 EP 97936674 A EP97936674 A EP 97936674A EP 97936674 A EP97936674 A EP 97936674A EP 0919049 A1 EP0919049 A1 EP 0919049A1
Authority
EP
European Patent Office
Prior art keywords
resonant circuit
dielectric layer
conductor tracks
circuit according
spiral conductor
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
EP97936674A
Other languages
German (de)
English (en)
Other versions
EP0919049B1 (fr
Inventor
Richard Altwasser
Peter Lendering
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.)
Meto International GmbH
Original Assignee
Meto International GmbH
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
Priority claimed from DE19705722A external-priority patent/DE19705722A1/de
Application filed by Meto International GmbH filed Critical Meto International GmbH
Publication of EP0919049A1 publication Critical patent/EP0919049A1/fr
Application granted granted Critical
Publication of EP0919049B1 publication Critical patent/EP0919049B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • 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
    • G08B13/2428—Tag details
    • G08B13/2448—Tag with at least dual detection means, e.g. combined inductive and ferromagnetic tags, dual frequencies within a single technology, tampering detection or signalling means on the tag

Definitions

  • the invention relates to a resonant circuit for electronic article surveillance.
  • Resonant circuits that are excited to resonate at a predetermined resonance frequency which is usually 8.2 MHz, are generally used for the purpose of theft protection in department stores. They are often an integral part of adhesive labels or hanging labels made of cardboard that are attached to the items to be secured.
  • the department store is equipped with an electronic surveillance system in the exit area that detects the resonant circuits and triggers an alarm if a secured article passes through a secured surveillance zone in an unauthorized manner.
  • the resonant circuit is deactivated.
  • the measure prevents an alarm from being triggered as soon as an item has been legally purchased and subsequently passes through the surveillance zone.
  • the deactivation systems which are often placed in the checkout area, generate a resonance signal with a greater amplitude than is generated in the monitoring systems.
  • a resonance label is usually deactivated with a signal whose field strength is greater than 1.5 A / m.
  • US Pat. No. 5,187,466 also describes a method for generating a deactivatable resonant circuit by means of a short circuit.
  • the resonant circuit disclosed therein has capacitor plates which are arranged on both sides of the dielectric.
  • the between The dielectric layer lying on the two capacitor plates has a through hole.
  • EP 0 181 327 B1 describes a deactivatable resonance label which is composed of a dielectric carrier layer, capacitor plates on both sides of the dielectric layer and a spiral turn on one of the two sides of the dielectric layer.
  • a selected area is prepared for the deactivation.
  • the dielectric layer is thinner here than in the other areas.
  • the invention is based on the object of proposing a resonant circuit which can be reliably deactivated.
  • the resonant circuit consists of two spiral conductor tracks and a dielectric layer, the two conductor tracks being wound in opposite directions and being arranged on both sides of the dielectric layer in such a way that they overlap at least partially, with at least a selected area is provided in which a conductive path between the two conductor tracks is formed as soon as a sufficiently high energy is supplied by an external alternating field.
  • the invention therefore has no separate capacitor plates; rather, these are directly through the two at least partially overlapping conductor tracks are formed.
  • the dielectric layer essentially has a uniform thickness and no additional manufacturing defects (e.g. air leakage).
  • This embodiment is particularly advantageous in connection with the further development that the selected area lies at the outer end areas of the conductor tracks, at which the induction voltage of the conductor tracks is maximum. So here it is completely superfluous to specially prepare any part of the resonant circuit. Taking advantage of physical laws, the deactivation area is automatically in a predeterminable area at the outer ends of the spiral conductor tracks.
  • An alternative embodiment of the resonant circuit according to the invention proposes that the selected area is located at any point on the overlapping conductor tracks and is prepared in such a way that the conductive path is set up at the prepared point when the deactivation signal is applied.
  • the dielectric layer in the selected area is thinner than in the other areas or that the prepared location is a hole in the dielectric layer.
  • Another embodiment of the resonant circuit according to the invention provides that the dielectric layer has a different physical or chemical nature in the selected area.
  • the dielectric Layer consists of at least two components.
  • very homogeneous dielectric layers containing negligibly small air pockets can be produced. It has proven to be advantageous if the melting point of one component is above the manufacturing temperature for the
  • Resonant circuits i.e. this layer will not melt during the manufacturing process.
  • the components are also in accordance with a further development of the
  • an advantageous development of the resonant circuit according to the invention provides that the overlap regions between the two conductor tracks and thus the capacitance between the spiral conductor tracks are concentrated at the inner ends of the conductor tracks.
  • a further improvement in terms of safe deactivation can also be achieved by the fact that the outer ends of the two conductor tracks overlap in a small area and that the outer ends of the conductor tracks are followed by a relatively long area without overlap.
  • Fig. 1 shows an embodiment of the resonant circuit 6 according to the invention in plan view.
  • FIG. 2 the resonant circuit 6 shown in FIG. 1 can be seen in cross section.
  • the resonant circuit 6 is deactivated by creating a short circuit between the two spiral conductor tracks 2, 3, which are preferably made of aluminum, through the dielectric layer 4.
  • An applied alternating magnetic field such as that emitted by the monitoring system, induces alternating voltages in the two spiral conductor tracks 2, 3 of the resonant circuit 6.
  • the two spiral conductor tracks 2, 3, which at least partially overlap, are wound in opposite directions. Therefore, the outer end of the lower coil 2 has a positive potential relative to the inner end of the lower coil 2 when that inner end of the upper coil 3 has a positive potential with respect to the outer end of the upper coil 3. It must therefore be noted that the points / areas in which the induced alternating voltages between the two coils 2, 3 are maximum are in the end areas of the coils 2, 3.
  • the upper coil 3 has fewer turns than the lower coil 2 in the example shown in FIG. 1, the highest voltages are generated between the ends of the upper coil 3 and the locations of the lower coil 2 directly below.
  • 3 illustrates the voltage relationships in different areas of the two at least partially overlapping coils 2, 3 of a resonant circuit 6 which can be used according to an advantageous development of the resonant circuit 6 according to the invention.
  • Fig. 3 shows the different voltages that occur in different areas of the two overlapping coils 2, 3 over their length during electromagnetic induction.
  • the deactivation takes place in the end regions of the upper coil 2 and lower coil 2, since the induced potential is maximum here. Since the electric field strength occurs concentrated on a surface with a small radius, deactivation occurs precisely at the ends of the conductor tracks 2, 3 - as shown in FIG. 4.
  • the dielectric layer 4 breaks down at these local weak points, although the voltage potential here is lower than at the ends of the upper coil 2 and lower coil 3. Since the voltage potential at the local weak points is lower than at the ends of the conductor tracks 2, 3, the electrical energy available for generating the deactivation short circuit is smaller than the electrical energy that would be necessary for generating a deactivation short circuit at the ends of the upper coil 3.
  • FIG. 5 shows a cross section of a dielectric 4 consisting of a layer with manufacturing defects, here air bubbles 7 and irregularities in the area of the surface.
  • a uniform dielectric layer 4 ensures deactivation at the points at which a maximum voltage and energy can be found, ie, in relation to the example shown, at the ends of the upper conductor track 2. Short circuits which result from such a deactivation are very robust and less susceptible to unintentional reactivation.
  • the dielectric layer 4 consists of at least two components 4a, 4b, an upper component 4a and a lower component 4b.
  • the lower component 4b is applied to the lower coil 3 before punching and hot stamping.
  • the upper component 4a is on the upper coil 2 applied.
  • the upper component 4a has a relatively low melting point, which enables it to serve as a hot melt adhesive and to glue the two coils 2, 3 onto the lower coil 3 during the hot stamping of the upper coil 2.
  • the upper component 4a of the dielectric layer 4 melts during the hot stamping of the upper coil 2.
  • the lower component 4b of the dielectric layer 4 has a higher melting point and does not melt during the hot stamping of the upper coil 2.
  • the uniformity of the lower component 4b of the dielectric layer 4 which does not melt, improves the uniformity in the thickness of the dielectric layer 4 as a whole.
  • FIG. 6 shows a cross section of a resonant circuit 6 with a dielectric layer 4 consisting of two components 4a, 4b.
  • the lower component 4b can be produced either by coating the lower coil 3 or by laminating the lower component 4b of the dielectric layer 4 onto the coil 3.
  • the coil material (AI) is usually in the form of wide roll material, so that the uniformity of the surface of the dielectric layer 4 can be maintained and other defects, which are caused, for example, by air pockets 7, are minimized.

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)
  • Filters And Equalizers (AREA)

Abstract

L'invention concerne un circuit à résonance (6) pour l'élément électronique. L'invention a pour objet de créer un circuit à résonance (6) pouvant être désactivé de manière fiable. A cet effet, le circuit à résonance (6) comporte deux circuits imprimés en spirale (2, 3) et une couche diélectrique (4), ces deux circuits imprimés en spirale (2, 3) étant bobinés dans des sens opposés et disposés des deux côtés de la couche diélectrique (4) de sorte qu'ils se chevauchent au moins partiellement. Au moins une région choisie (8) est prévue, dans laquelle un chemin conducteur est créé entre les deux circuits imprimés en spirale (2, 3) dès qu'une énergie suffisamment élevée est appliquée au moyen d'un champ alternatif externe.
EP97936674A 1996-08-06 1997-07-29 Circuit a resonance pour element antivol electronique Expired - Lifetime EP0919049B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19631775 1996-08-06
DE19631775 1996-08-06
DE19705722 1997-02-14
DE19705722A DE19705722A1 (de) 1996-08-06 1997-02-14 Resonanzschwingkreis für die elektronische Artikelsicherung
PCT/EP1997/004113 WO1998006074A1 (fr) 1996-08-06 1997-07-29 Circuit a resonance pour element antivol electronique

Publications (2)

Publication Number Publication Date
EP0919049A1 true EP0919049A1 (fr) 1999-06-02
EP0919049B1 EP0919049B1 (fr) 2000-03-29

Family

ID=26028182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97936674A Expired - Lifetime EP0919049B1 (fr) 1996-08-06 1997-07-29 Circuit a resonance pour element antivol electronique

Country Status (11)

Country Link
US (1) US6169482B1 (fr)
EP (1) EP0919049B1 (fr)
JP (1) JP3974659B2 (fr)
AT (1) ATE191288T1 (fr)
AU (1) AU3941897A (fr)
CA (1) CA2262585C (fr)
DK (1) DK0919049T3 (fr)
ES (1) ES2147017T3 (fr)
NO (1) NO313065B1 (fr)
PT (1) PT919049E (fr)
WO (1) WO1998006074A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19905886A1 (de) * 1999-02-11 2000-08-17 Meto International Gmbh Identifizierungselement und Verfahren zur Herstellung eines Identifizierungselements
JP3390389B2 (ja) * 1999-12-08 2003-03-24 チェックポイント・マニュファクチュアリング・ジャパン株式会社 共振タグ
US6400271B1 (en) * 2000-03-20 2002-06-04 Checkpoint Systems, Inc. Activate/deactiveable security tag with enhanced electronic protection for use with an electronic security system
FR2832530B1 (fr) * 2001-11-22 2004-08-20 Nojim Procede de fabrication d'une etiquette a circuits de resonance
JP2005280287A (ja) * 2004-03-31 2005-10-13 Tokai Aluminum Foil Co Ltd 共振ラベル用積層材の製造法
JP2006301827A (ja) * 2005-04-19 2006-11-02 Aruze Corp 非接触ｉｃカードシステム、並びに非接触ｉｃカードの取付体
US20070164865A1 (en) * 2005-11-04 2007-07-19 Gerald Giasson Security sensor system
US20080191883A1 (en) * 2007-02-12 2008-08-14 Checkpoint Systems, Inc. Resonant tag
US7812734B2 (en) * 2007-12-20 2010-10-12 Ken Hardin Alarm system employing existing conductive aspect of copper lines as well as optional pressure switch sensor for triggering a copper theft event

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5285191A (en) * 1981-10-30 1994-02-08 Reeb Max E LC marker construction useful as an electromagnetically interrogatable transponder means
US4498076A (en) * 1982-05-10 1985-02-05 Lichtblau G J Resonant tag and deactivator for use in an electronic security system
DE3221500A1 (de) 1982-06-07 1983-12-08 Max-E. Dipl.-Ing. 7320 Göppingen Reeb Identifizierungsanordnung in form eines an einem gegenstand anbringbaren gebildes und verfahren zur herstellung
NL8700388A (nl) 1987-02-17 1988-09-16 Nedap Nv Flexibele identificatielabel.
US4876555B1 (en) * 1987-03-17 1995-07-25 Actron Entwicklungs Ag Resonance label and method for its fabrication
CH680823A5 (fr) 1990-08-17 1992-11-13 Kobe Properties Ltd
CH682957A5 (de) * 1991-04-16 1993-12-15 Kobe Properties Ltd Verfahren zur Deaktivierung einer Resonanz-Etikette.
US5241299A (en) 1991-05-22 1993-08-31 Checkpoint Systems, Inc. Stabilized resonant tag circuit
DE69522214T2 (de) 1995-07-17 2002-05-08 Checkpoint Mfg Japan Co Resonanzetikett und Verfahren zu seiner Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9806074A1 *

Also Published As

Publication number Publication date
CA2262585C (fr) 2002-02-26
NO313065B1 (no) 2002-08-05
WO1998006074A1 (fr) 1998-02-12
US6169482B1 (en) 2001-01-02
NO990516L (no) 1999-02-04
JP3974659B2 (ja) 2007-09-12
NO990516D0 (no) 1999-02-04
DK0919049T3 (da) 2000-08-28
JP2001507141A (ja) 2001-05-29
ES2147017T3 (es) 2000-08-16
AU3941897A (en) 1998-02-25
CA2262585A1 (fr) 1998-02-12
ATE191288T1 (de) 2000-04-15
PT919049E (pt) 2000-09-29
EP0919049B1 (fr) 2000-03-29

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