EP1224640B1 - Securing element for electronically securing articles - Google Patents

Securing element for electronically securing articles Download PDF

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Publication number
EP1224640B1
EP1224640B1 EP00969337A EP00969337A EP1224640B1 EP 1224640 B1 EP1224640 B1 EP 1224640B1 EP 00969337 A EP00969337 A EP 00969337A EP 00969337 A EP00969337 A EP 00969337A EP 1224640 B1 EP1224640 B1 EP 1224640B1
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EP
European Patent Office
Prior art keywords
security element
contact zone
dielectric layer
securing
conducting track
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.)
Expired - Lifetime
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EP00969337A
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German (de)
French (fr)
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EP1224640A1 (en
Inventor
Richard Altwasser
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
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Checkpoint Systems International GmbH
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Publication of EP1224640A1 publication Critical patent/EP1224640A1/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—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
    • 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
    • G08B13/2431—Tag circuit details

Definitions

  • the invention relates to a fuse element for electronic Article surveillance.
  • a corresponding securing element consisting of a lower conductor track and an upper conductor track, the conductor tracks having a contact zone and then each having a turn with a different sense of rotation and the conductor tracks being arranged one above the other and in the area of the contact zone an electrical connection between the lower conductor track and the upper one Conductor exists, has become known, for example, from DE 197 08 180 A1, in which case the entire securing element has at least one turn with an included angle of rotation of 2 ⁇ .
  • Such fuse elements are referred to as resonant resonant circuits or as radio frequency (RF) fuse elements, the resonant frequency being determined by the capacitance C , the inductance L and the resistance R of the resonant circuit.
  • Radio frequency security elements come in the form of labels or followers in the prevention and detection of Thefts used in department stores and warehouses and delight popularity due to the high detection rate.
  • the article security itself can be summarized as follows describe:
  • the radio frequency fuse elements are in the surveillance zone of the area to be secured - Usually this is the input and output area of the Department store or warehouse - through an alternating magnetic field for sending a characteristic detection signal stimulated. Once the surveillance system this Detection signal registered, an alarm is triggered. For visitors to a department store or warehouse can see two Pillars of the surveillance system between which everyone wants to leave the department store or warehouse, must go through.
  • One way to increase the detection rate is to increase the size of the fuse element.
  • the disadvantage of this solution is that the costs for the securing element increase and, moreover, goods with small external dimensions can be provided with such large securing elements only with difficulty.
  • Another disadvantage of the known RF fuse elements is that the resonance frequency of the fuse elements is detuned by an electrically conductive mass located in the vicinity of the fuse element; ie can be changed. A knowledgeable thief can take advantage of this effect and drastically reduce the deceiving rate by holding the security element in his hand.
  • there are difficulties in detecting security elements of the type described which are attached to products with a high water content, with sufficient certainty. Such products with high water content are e.g. B. meat, fish or beverage bottles.
  • the invention is therefore based on the object To provide fuse element, the same Dimensions like the known fuse elements a better one Has detection rate.
  • a Securing element for electronic article surveillance consisting of a lower conductor track and an upper one Conductor track, the conductor tracks being a contact zone and attached to it one turn each with a different turn Have sense of rotation, wherein the conductor tracks are arranged one above the other are electrical and in the area of the contact zone Connection between the lower trace and the upper trace exists and the one enclosed by both turns Angle of rotation is less than 2 ⁇ .
  • the effective volume V eff [m 3 ] is an important parameter for assessing the performance of an RF security element.
  • the effective volume V eff is defined as the quotient of the magnetic moment which is emitted by the securing element and the field strength H of the magnetic field in which the securing element is located.
  • the increase in the effective volume V eff reduces the sensitivity of the monitoring system to interference, it allows the columns to be spaced further apart, or it increases the detection rate of the monitoring system under otherwise identical conditions.
  • the inventive design of the security element increases the effective volume V eff by approximately 20% compared to known RF security elements.
  • the configuration of the dielectric is particularly advantageous Layer as an adhesive layer, dielectric film, in particular made of PET, and / or dielectric lacquer layer, because of simple and effectively prevents the electrical connection becomes.
  • An embodiment of the invention provides that the thickness of the dielectric layer is less than or equal to 2 ⁇ m, so that the capacity of that formed by the circuit boards Resonant circuit is increased and also the ability to influence the resonance frequency by near the fuse element located electrically conductive masses greatly reduced becomes.
  • Fig. 1 shows a plan view of a lower conductor track 1.
  • Die lower conductor track 1 is made of an aluminum foil of approximately 38 punched out to thickness.
  • the lower conductor track 1 has one Contact zone 2, within which an electrical contact between the lower conductor track 1 and one in FIG. 1 not shown upper trace exists.
  • the lower conductor track 1 wound counterclockwise.
  • the one from the turn 2 included rotation angle a is less than 2 ⁇ .
  • Fig. 2 shows a plan view of an upper conductor track 5.
  • Die upper conductor track 5 is also made of an aluminum foil punched out and has the same dimensions as the lower one Conductor 1.
  • the one also present on the upper conductor 5 Contact zone 2 is in the assembled state of the Fuse element an electrical connection between lower circuit board 1 and upper circuit board 5 ago.
  • the upper conductor track 5 is wound clockwise, also here the angle of rotation b enclosed by the turn 2 is less than 2 ⁇ .
  • the Angle of rotation a and b enclosed by both less than 2 ⁇ each, because of the full turn of 2 ⁇ in each case at least one gap 4 is to be deducted.
  • the thickness of the lower interconnect 1 and the upper interconnect 5 can go up or down from the above 38 ⁇ m differ.
  • the production of conductor tracks 1 and 5 can be based on other ways than by punching out. The punching out is inexpensive because the two conductor tracks 1 and 5 are relative are broad and simple. Between the ends of the Windings 3 and the contact zones 2, the gap 4 is present. Then the entire lower conductor track 1 with a dielectric layer coated. This layer is in the Area of contact zone 2 removed again or weakened.
  • FIG. 3 is an embodiment of an inventive Fuse element shown, which results from the lower and the upper conductor tracks 1 and 5.
  • the contact zone 2 In the area the contact zone 2 is an electrical contact between two conductor tracks 1 and 5. Otherwise prevents one between lower trace 1 and upper trace 5 arranged dielectric layer, not shown in Fig. 3 the electrical contact between the conductor tracks 1 and 5.
  • the conductor tracks 1 and 5 and the dielectric layer are arranged on a carrier plate 7, which outer dimensions of typically 40 mm x 40 mm and for which required mechanical stability of the securing element provides.
  • the capacitance C of the fuse element must be increased accordingly. This is done by reducing the thickness of the dielectric layer between lower interconnect 1 and upper interconnect 5.
  • the thickness of this layer in a fuse element according to the invention is approximately 2 ⁇ m or less, instead of 3 ⁇ m to 4 ⁇ m in fuse elements according to the prior art.
  • Etched RF security elements according to the prior art even have layer thicknesses of 30 ⁇ m to 50 ⁇ m.
  • the effective volume V eff is approximately 1.2 L to 1.3 L. In the case of the fuse elements according to the invention, the effective volume V eff is approximately 1 for the same area. 5 L to 1.6 L.
  • the increase in the capacitance C also leads to a greater insensitivity of the securing element to detuning, that is to say a change in the resonance frequency.
  • Detuning occurs whenever the fuse element is brought into close proximity to a large electrically conductive mass. High dielectric losses occur between this electrically conductive mass and the conductor tracks 1 and 5, which change the resonance frequency of the fuse element and reduce its Q factor. As a result, the effective volume V eff of the securing element also decreases.
  • the above-mentioned electrically conductive compound can be the hand or the body of a department store thief, the above-mentioned products or the like with high water content. his.
  • the Q factor by the proximity of a hand of values between 50 and 80 decrease to values between 10 and 30.
  • the resonance frequency can shift by 10% to 20%.
  • the Q factor drops due to the proximity of one hand only by about 10% the resonance frequency only shifts by about 1%.
  • the detection rate of the security element according to the invention is by hand or another electrically conductive Mass not significantly influenced. Even if that securing element according to the invention enclosed by two hands the detection rate remains almost unchanged high.

Abstract

A radio frequency security element is provided for electronic surveillance of articles of merchandise. The security element comprises a lower strip conductor ( 1 ) and an upper strip conductor ( 5 ), which are wound in opposite directions. The upper and lower strip conductors and superimposed and connected in a common contact zone. The coil turns of the two conductor strips each have an included angle of rotation less than 2pi. The security element has an improved detection rate and is particularly stable against changes in the resonance frequency.

Description

Die Erfindung betrifft ein Sicherungselement für die elektronische Artikelsicherung.The invention relates to a fuse element for electronic Article surveillance.

Ein entsprechendes Sicherungselement bestehend aus einer unteren Leiterbahn und einer oberen Leiterbahn, wobei die Leiterbahnen eine Kontaktzone und daran anschließend je eine Windung mit unterschiedlichem Drehsinn aufweisen und wobei die Leiterbahnen übereinander angeordnet sind und im Bereich der Kontaktzone eine elektrische Verbindung zwischen der unteren Leiterbahn und der oberen Leiterbahn besteht, ist beispielsweise aus der DE 197 08 180 A1 bekannt geworden, wobei hier das gesamte Sicherungselement zumindest eine Windung mit einem eingeschlossenen Drehwinkel von 2π aufweist. Derartige Sicherungselemente werden als Resonanzschwingkreise oder als Radiofrequenz-(RF-)Sicherungselemente bezeichnet, wobei die Resonanzfrequenz durch die Kapazität C, die Induktivität L und den Widerstand R des Schwingkreises bestimmt ist.A corresponding securing element consisting of a lower conductor track and an upper conductor track, the conductor tracks having a contact zone and then each having a turn with a different sense of rotation and the conductor tracks being arranged one above the other and in the area of the contact zone an electrical connection between the lower conductor track and the upper one Conductor exists, has become known, for example, from DE 197 08 180 A1, in which case the entire securing element has at least one turn with an included angle of rotation of 2π. Such fuse elements are referred to as resonant resonant circuits or as radio frequency (RF) fuse elements, the resonant frequency being determined by the capacitance C , the inductance L and the resistance R of the resonant circuit.

Radiofrequenz-Sicherungselemente werden in Form von Etiketten oder Anhängern bei der Prävention und Erkennung von Diebstählen in Kaufhäusern und Lagern eingesetzt und erfreuen sich infolge der hohen Detektionsrate steigender Beliebtheit.Radio frequency security elements come in the form of labels or followers in the prevention and detection of Thefts used in department stores and warehouses and delight popularity due to the high detection rate.

Die Artikelsicherung selbst läßt sich in Kürze wie folgt beschreiben: Die Radiofrequenz-Sicherungselemente werden in der Überwachungszone des zu sichernden Bereichs - üblicherweise ist dies der Eingangs- und Ausgangsbereich des Kaufhauses oder Lagers - durch ein magnetisches Wechselfeld zur Aussendung eines charakteristischen Erkennungssignals angeregt. Sobald das Überwachungssystem dieses Erkennungssignal registriert, wird ein Alarm ausgelöst. Für den Besucher eines Kaufhauses oder Lagers sichtbar sind zwei Säulen des Überwachungssystems zwischen denen Jedermann, der das Kaufhaus oder Lager verlassen will, hindurchgehen muß.The article security itself can be summarized as follows describe: The radio frequency fuse elements are in the surveillance zone of the area to be secured - Usually this is the input and output area of the Department store or warehouse - through an alternating magnetic field for sending a characteristic detection signal stimulated. Once the surveillance system this Detection signal registered, an alarm is triggered. For visitors to a department store or warehouse can see two Pillars of the surveillance system between which everyone wants to leave the department store or warehouse, must go through.

Wesentlich für die Detektionsrate des Überwachungssystems sind die räumlichen Abstände der o. g. Säulen, das Niveau der vorhandenen Störungen und die Leistungsfähigkeit des RF-Sicherungselements. Are essential for the detection rate of the monitoring system the spatial distances of the above Pillars, the level of existing faults and the performance of the RF security element.

Eine Möglichkeit die Detektionsrate zu erhöhen, besteht darin, die Abmessungen des Sicherungselements zu vergrößern. Nachteilig an dieser Lösung ist, dass die Kosten für das Sicherungselement ansteigen und außerdem Waren mit geringen Außenabmessungen nur unter Schwierigkeiten mit solchen großen Sichsrungselementen versehen werden können.
Ein weiterer Nachteil der bekannten RF-Sicherungselemente besteht darin, dass die Resonanz-Frequenz der Sicherungselemente durch eine in der Nähe des Sicherungselements befindliche elektrisch leitende Masse verstimmt; d. h. verändert werden kann. Diesen Effekt kann sich ein kundiger Dieb zunutze machen und die Decektionsrate drastisch verringern, indem er das Sicherungselement in seine Hand nimmt. Darüber hinaus bestehen Schwierigkeiten, Sicherungselemente der beschriebenen Art, die an Produkten mit hohem Wassergehalt angebracht sind, mit hinreichender Sicherheit zu detektieren. Solche Produkte mit hohem Wassergehalt sind z. B. Fleisch, Fisch oder Getränkeflaschen.One way to increase the detection rate is to increase the size of the fuse element. The disadvantage of this solution is that the costs for the securing element increase and, moreover, goods with small external dimensions can be provided with such large securing elements only with difficulty.
Another disadvantage of the known RF fuse elements is that the resonance frequency of the fuse elements is detuned by an electrically conductive mass located in the vicinity of the fuse element; ie can be changed. A knowledgeable thief can take advantage of this effect and drastically reduce the deceiving rate by holding the security element in his hand. In addition, there are difficulties in detecting security elements of the type described, which are attached to products with a high water content, with sufficient certainty. Such products with high water content are e.g. B. meat, fish or beverage bottles.

Der Erfindung liegt somit die Aufgabe zugrunde, ein Sicherungselement bereitzustellen, das bei gleichen Abmessungen wie die bekannten Sicherungselemente eine bessere Detektionsrate aufweist.The invention is therefore based on the object To provide fuse element, the same Dimensions like the known fuse elements a better one Has detection rate.

Diese Aufgabe wird erfindungsgemäß gelöst durch ein Sicherungselement für die elektronische Artikelsicherung, bestehend aus einer unteren Leiterbahn und einer oberen Leiterbahn, wobei die Leiterbahnen eine Kontaktzone und daran einseitig anschließend je eine Windung mit unterschiedlichem Drehsinn aufweisen, wobei die Leiterbahnen übereinander angeordnet sind und im Bereich der Kontaktzone eine elektrische Verbindung zwischen der unteren Leiterbahn und der oberen Leiterbahn besteht und wobei der von beiden Windungen eingeschlossene Drehwinkel jeweils kleiner 2 π ist.This object is achieved by a Securing element for electronic article surveillance, consisting of a lower conductor track and an upper one Conductor track, the conductor tracks being a contact zone and attached to it one turn each with a different turn Have sense of rotation, wherein the conductor tracks are arranged one above the other are electrical and in the area of the contact zone Connection between the lower trace and the upper trace exists and the one enclosed by both turns Angle of rotation is less than 2 π.

Durch die Verringerung des von den Windungen eingeschlossenen Drehwinkels auf weniger als 2 π und die sich je einseitig an die Kontaktzone anschließenden beiden Windungen mit unterschiedlichem Drehsinn vergrößert sich die von den Windungen eingeschlossene Fläche und mit ihr das effektive Volumen Veff. Dadurch wird die Detektionsrate des Sicherungselements deutlich verbessert.By reducing the angle of rotation enclosed by the turns to less than 2 π and the two turns each adjoining the contact zone with different directions of rotation, the area enclosed by the turns increases and with it the effective volume V eff . This significantly improves the detection rate of the security element.

Das effektive Volumen Veff [m3] ist ein wichtiger Parameter zur Beurteilung der Leistungsfähigkeit eines RF-Sicherungselements. Das effektive Volumen Veff ist definiert als der Quotient aus dem magnetischen Moment, welches von dem Sicherungselement ausgesandt wird, und der Feldstärke H des Magnetfeldes in den sich das Sicherungselement befindet.The effective volume V eff [m 3 ] is an important parameter for assessing the performance of an RF security element. The effective volume V eff is defined as the quotient of the magnetic moment which is emitted by the securing element and the field strength H of the magnetic field in which the securing element is located.

Die Erhöhung des effektiven Volumens Veff verringert die Empfindlichkeit des Überwachungssystems gegenüber Störungen, sie erlaubt größere Abstände der Säulen zueinander oder sie erhöht bei ansonsten gleichen Bedingungen die Detektionsrate des Überwachungssystems. Durch die erfindungsgemäße Ausgestaltung des Sicherungselements wird das effektive Volumen V eff um etwa 20% gegenüber bekannten RF-Sicherungselementen erhöht.The increase in the effective volume V eff reduces the sensitivity of the monitoring system to interference, it allows the columns to be spaced further apart, or it increases the detection rate of the monitoring system under otherwise identical conditions. The inventive design of the security element increases the effective volume V eff by approximately 20% compared to known RF security elements.

Bei einer Variante der Erfindung ist vorgesehen, dass zwischen der unteren Leiterbahn und der oberen Leiterbahn mit Ausnahme der Kontaktzone eine dielektrische Schicht vorhanden ist, so dass zuverlässig verhindert wird, dass eine elektrische Verbindung zwischen den Leiterplatten an anderer Stelle als an den Kontaktzonen besteht.In a variant of the invention it is provided that between the lower trace and the upper trace except there is a dielectric layer in the contact zone, so that reliably prevents an electrical Connection between the circuit boards at a different location than at the contact zones.

Besonders vorteilhaft ist die Ausgestaltung der dielektrischen Schicht als Klebeschicht, dielektrische Folie, insbesondere aus PET, und/oder dielektrische Lackschicht, da auf einfache und wirksame Weise die elektrische Verbindung unterbunden wird.The configuration of the dielectric is particularly advantageous Layer as an adhesive layer, dielectric film, in particular made of PET, and / or dielectric lacquer layer, because of simple and effectively prevents the electrical connection becomes.

Eine Ausgestaltung der Erfindung sieht vor, dass die Dicke der dielektrischen Schicht kleiner oder gleich 2 µm ist, so dass die Kapazität des von den Leiterplatten gebildeten Schwingkreises erhöht wird und außerdem die Beeinflußbarkeit der Resonanzfrequenz durch in der Nähe des Sicherungselements befindlichen elektrisch leitenden Massen stark verringert wird.An embodiment of the invention provides that the thickness of the dielectric layer is less than or equal to 2 µm, so that the capacity of that formed by the circuit boards Resonant circuit is increased and also the ability to influence the resonance frequency by near the fuse element located electrically conductive masses greatly reduced becomes.

In Ergänzung der Erfindung ist vorgesehen, die Leiterbahnen im 3ereich der Kontaktzonen durch Durchstanzen elektrisch zu verbinden, so dass die elektrische Verbindung sicher, kostengünstig und mechanisch hoch belastbar hergestellt wirdIn addition to the invention, it is provided that the conductor tracks in 3 area of the contact zones by punching through electrically connect so the electrical connection sure is manufactured inexpensively and mechanically highly resilient

Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind in der nachfolgenden Zeichnung, der Beschreibung und den Ansprüchen entnehmbar.Further advantages and advantageous configurations of the Invention are in the drawing below, the Description and the claims removed.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und im folgenden näher beschrieben. Es zeigen:

Fig. 1:
eine Draufsicht auf die untere Leiterbahn gemäß einer bevorzugten Ausgestaltung des erfindungsgemäßen Sicherungselements,
Fig. 2:
eine Draufsicht auf die obere Leiterbahn gemäß einer bevorzugten Ausgestaltung des erfindungsgemäßen Sicherungselements und
Fig. 3:
eine Draufsicht auf ein erfindungsgemäßes Sicherungselement, das sich aus den in den Figuren Fig. 1 und Fig. 2 gezeigten Leiterbahnen zusammensetzt.
An embodiment of the invention is shown in the drawing and described in more detail below. Show it:
Fig. 1:
a plan view of the lower conductor track according to a preferred embodiment of the fuse element according to the invention,
Fig. 2:
a plan view of the upper conductor track according to a preferred embodiment of the fuse element according to the invention and
Fig. 3:
a plan view of a fuse element according to the invention, which is composed of the conductor tracks shown in Figures 1 and 2.

Fig. 1 zeigt eine Draufsicht auf eine untere Leiterbahn 1. Die untere Leiterbahn 1 ist aus einer Aluminiumfolie von etwa 38 um Dicke ausgestanzt. Die untere Leiterbahn 1 weist eine Kontaktzone 2 auf, innerhalb derer ein elektrischer Kontakt zwischen der unteren Leiterbahn 1 und einer in Fig. 1 nicht dargestellten oberen Leiterbahn besteht. Fig. 1 shows a plan view of a lower conductor track 1. Die lower conductor track 1 is made of an aluminum foil of approximately 38 punched out to thickness. The lower conductor track 1 has one Contact zone 2, within which an electrical contact between the lower conductor track 1 and one in FIG. 1 not shown upper trace exists.

Ausgehend von der Kontaktzone 2 ist die untere Leiterbahn 1 entgegen dem Uhrzeigersinn gewunden. Der von der Windung 2 eingeschlossene Drehwinkel a ist kleiner 2 π.Starting from the contact zone 2, the lower conductor track 1 wound counterclockwise. The one from the turn 2 included rotation angle a is less than 2 π.

Fig. 2 zeigt eine Draufsicht auf eine obere Leiterbahn 5. Die obere Leiterbahn 5 ist ebenfalls aus einer Aluminiumfolie ausgestanzt und hat die gleichen Abmessungen wie die untere Leiterbahn 1. Die auch auf der oberen Leiterbahn 5 vorhandene Kontaktzone 2 stellt in zusammengebautem Zustand des Sicherungselements eine elektrische Verbindung zwischen unterer Leiterplatte 1 und oberer Leiterplatte 5 her. Die obere Leiterbahn 5 ist im Uhrzeigersinn gewunden, wobei auch hier der von der Windung 2 eingeschlossene Drehwinkel b kleiner 2 π ist. Bei dieser Ausführungsform sind somit die von beiden Windungen eingeschlossenen Drehwinkel a und b jeweils kleiner 2 π, da von der vollen Windung von 2 π jeweils noch wenigstens ein Spalt 4 abzuziehen ist.Fig. 2 shows a plan view of an upper conductor track 5. Die upper conductor track 5 is also made of an aluminum foil punched out and has the same dimensions as the lower one Conductor 1. The one also present on the upper conductor 5 Contact zone 2 is in the assembled state of the Fuse element an electrical connection between lower circuit board 1 and upper circuit board 5 ago. The upper conductor track 5 is wound clockwise, also here the angle of rotation b enclosed by the turn 2 is less than 2π. In this embodiment, the Angle of rotation a and b enclosed by both turns less than 2 π each, because of the full turn of 2 π in each case at least one gap 4 is to be deducted.

Die Dicke der unteren Leiterbahn 1 und der oberen Leiterbahn 5 kann nach oben oder unten von den oben erwähnten 38 µm abweichen. Die Herstellung der Leiterbahnen 1 und 5 kann auf anderem Wege als durch Ausstanzen erfolgen. Das Ausstanzen ist kostengünstig, da die beiden Leiterbahnen 1 und 5 relativ breit und einfach gestaltet sind. Zwischen den Enden der Windungen 3 und den Kontaktzonen 2 ist der Spalt 4 vorhanden. Anschließend wird die gesamte untere Leiterbahn 1 mit einer dielektrischen Schicht überzogen. Diese Schicht wird im Bereich der Kontaktzone 2 wieder entfernt, bzw. geschwächt. The thickness of the lower interconnect 1 and the upper interconnect 5 can go up or down from the above 38 µm differ. The production of conductor tracks 1 and 5 can be based on other ways than by punching out. The punching out is inexpensive because the two conductor tracks 1 and 5 are relative are broad and simple. Between the ends of the Windings 3 and the contact zones 2, the gap 4 is present. Then the entire lower conductor track 1 with a dielectric layer coated. This layer is in the Area of contact zone 2 removed again or weakened.

In Fig. 3 ist ein Ausführungsbeispiel eines erfindungsgemäßen Sicherungselements dargestellt, welches sich aus der unteren und der oberen Leiterbahn 1 und 5 zusammensetzt. Im Bereich der Kontaktzone 2 besteht ein elektrischer Kontakt zwischen beiden Leiterbahnen 1 und 5. Ansonsten verhindert eine zwischen unterer Leiterbahn 1 und oberer Leiterbahn 5 angeordnete in Fig. 3 nicht dargestellte dielektrische Schicht den elektrischen Kontakt zwischen den Leiterbahnen 1 und 5.3 is an embodiment of an inventive Fuse element shown, which results from the lower and the upper conductor tracks 1 and 5. In the area the contact zone 2 is an electrical contact between two conductor tracks 1 and 5. Otherwise prevents one between lower trace 1 and upper trace 5 arranged dielectric layer, not shown in Fig. 3 the electrical contact between the conductor tracks 1 and 5.

Die Leiterbahnen 1 und 5 sowie die dielektrische Schicht sind auf einer Trägerplatte 7 angeordnet, welche Außenabmessungen von typischerweise 40 mm x 40 mm haben kann und für die erforderliche mechanische Stabilität des Sicherungselements sorgt.The conductor tracks 1 and 5 and the dielectric layer are arranged on a carrier plate 7, which outer dimensions of typically 40 mm x 40 mm and for which required mechanical stability of the securing element provides.

Aufgrund der kleinen Anzahl von Windungen der Leiterbahnen 1 und 5 ist die von den Windungen eingeschlossene Fläche 9, relativ groß, was die magnetische Duchflutung  erhöht. In Folge der erhöhten Duchflutung  nimmt auch das effektive Volumen V eff zu.Due to the small number of turns of the conductor tracks 1 and 5, the area 9 enclosed by the turns is relatively large, which increases the magnetic flooding . As a result of the increased flooding , the effective volume V eff also increases.

Um trotz der geringen Windungszahl des erfindungsgemäßen Sicherungelements und ensprechend geringer Induktivität L die übliche Resonanzfrequenz von 8,2 MHz zu erhalten, muß die Kapazität C des Sicherungselements entsprechend angehoben werden. Dies geschieht durch eine Verringerung der Dicke der dielektrischen Schicht zwischen unterer Leiterbahn 1 und oberer Leiterbahn 5. Typischerweise beträgt die Dicke dieser Schicht bei einem erfindungsgemäßen Sicherungselement etwa 2 µm oder weniger, anstelle von 3 µm bis 4 µm bei Sicherungselementen nach dem Stand der Technik. Geätzte RF-Sicherungselemente nach dem Stand der Technik weisen sogar Schichtdicken von 30 µm bis 50 µm auf.In order to maintain the usual resonance frequency of 8.2 MHz despite the low number of turns of the fuse element according to the invention and correspondingly low inductance L , the capacitance C of the fuse element must be increased accordingly. This is done by reducing the thickness of the dielectric layer between lower interconnect 1 and upper interconnect 5. Typically, the thickness of this layer in a fuse element according to the invention is approximately 2 μm or less, instead of 3 μm to 4 μm in fuse elements according to the prior art. Etched RF security elements according to the prior art even have layer thicknesses of 30 µm to 50 µm.

Bei Sicherungelementen nach dem Stand der Technik, deren Außenabmessungen 40 mm x 40 mm betragen, beträgt das effektive Volumen V eff etwa 1,2 L bis 1,3 L. Bei den erfindungsgemäßen Sicherungelementen beträgt das effektive Volumen V eff bei gleicher Fläche etwa 1,5 L bis 1,6 L.In the case of fuse elements according to the prior art, the external dimensions of which are 40 mm × 40 mm, the effective volume V eff is approximately 1.2 L to 1.3 L. In the case of the fuse elements according to the invention, the effective volume V eff is approximately 1 for the same area. 5 L to 1.6 L.

Die Erhöhung der Kapazität C führt außerdem zu einer größeren Unempfindlichkeit des Sicherungselements gegen Verstimmen, d. h. einer Änderung der Resonanz-Frequenz. Das Verstimmen tritt immer dann ein, wenn das Sicherungselement in unmittelbare Nähe einer großen elektrisch leitenden Masse gebracht wird. Zwischen dieser elektrisch leitenden Masse und den Leiterbahnen 1 und 5 entstehen hohe dielektrische Verluste, welche die Resonanzfrequenz des Sicherungselements ändern und dessen Q-Faktor verringern. In Folge dessen verringert sich auch das effektive Volumen V eff des Sicherungselements. Die o. g. elektrisch leitende Masse kann die Hand oder der Körper eines Kaufhausdiebs, die o. g. Produkte mit hohem Wassergeahlt odgl. sein. The increase in the capacitance C also leads to a greater insensitivity of the securing element to detuning, that is to say a change in the resonance frequency. Detuning occurs whenever the fuse element is brought into close proximity to a large electrically conductive mass. High dielectric losses occur between this electrically conductive mass and the conductor tracks 1 and 5, which change the resonance frequency of the fuse element and reduce its Q factor. As a result, the effective volume V eff of the securing element also decreases. The above-mentioned electrically conductive compound can be the hand or the body of a department store thief, the above-mentioned products or the like with high water content. his.

Bei den oben erwähnten geätzten Sicherungslementen kann der Q-Faktor durch die Nähe einer Hand von Werten zwischen 50 und 80 auf Werte zwischen 10 und 30 absinken. Die Resonanzfrequenz kann sich um 10 % bis 20 % verschieben.In the case of the etched security elements mentioned above, the Q factor by the proximity of a hand of values between 50 and 80 decrease to values between 10 and 30. The resonance frequency can shift by 10% to 20%.

Bei einem erfindungsgemäßen Sicherungselement sinkt der der Q-Faktor durch die Nähe einer Hand nur um etwa 10 %, während sich die Resonanzfrequenz nur um etwa 1 % verschiebt. D. h. die Detektionsrate des erfindungsgemäßen Sicherungselements ist durch die Hand oder eine andere elektrisch leitfähige Masse nicht nennenswert beeinflußbar. Selbst wenn das erfindungsgemäße Sicherungselement von zwei Händen umschlossen wird, bleibt die Detektionsrate nahezu unverändert hoch.In a securing element according to the invention, the Q factor drops due to the proximity of one hand only by about 10% the resonance frequency only shifts by about 1%. I.e. the detection rate of the security element according to the invention is by hand or another electrically conductive Mass not significantly influenced. Even if that securing element according to the invention enclosed by two hands the detection rate remains almost unchanged high.

Aufgrund der Dimensionierung der Trägerplatte 7 zeichnet sich das erfindungsgemäße Sicherungselement darüber hinaus durch eine hohe mechanische Stabilität aus.Due to the dimensioning of the carrier plate 7 stands out the securing element according to the invention also by high mechanical stability.

Claims (7)

  1. A security element for electronic article surveillance, comprising one lower conducting track (1) and one upper conducting track (5), said conducting tracks (1, 5) having a respective contact zone (2) and each comprising, contiguous therewith on one side, a coil turn (3) with a different sense of winding, said conducting tracks (1, 5) being arranged in superposition and an electrical connection existing between the lower conducting track (1) and the upper conducting track (5) in the area of the contact zone (2), and the angle of rotation (a, b) included by both coil turns (3) being smaller than 2π.
  2. The security element as claimed in claim 1, characterized in that a dielectric layer is provided between the lower conducting track (1) and the upper conducting track (5) except for the contact zone (2).
  3. The security element as claimed in claim 2, characterized in that the dielectric layer is an adhesive layer.
  4. The security element as claimed in claim 2, characterized in that the dielectric layer is a dielectric film, in particular made of PET.
  5. The security element as claimed in claim 2, characterized in that the dielectric layer is a dielectric lacquer layer.
  6. The security element as claimed in any one of the claims 2 to 5, characterized in that the thickness of the dielectric layer is smaller that or equal to 2 µm.
  7. The security element as claimed in any one of the preceding claims, characterized in that the conducting tracks (1, 5) are electrically connected in the area of the contact zone (2) by perforating.
EP00969337A 1999-10-27 2000-09-28 Securing element for electronically securing articles Expired - Lifetime EP1224640B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19951561A DE19951561A1 (en) 1999-10-27 1999-10-27 Securing element for electronic article surveillance
DE19951561 1999-10-27
PCT/EP2000/009522 WO2001031601A1 (en) 1999-10-27 2000-09-28 Securing element for electronically securing articles

Publications (2)

Publication Number Publication Date
EP1224640A1 EP1224640A1 (en) 2002-07-24
EP1224640B1 true EP1224640B1 (en) 2003-08-06

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Application Number Title Priority Date Filing Date
EP00969337A Expired - Lifetime EP1224640B1 (en) 1999-10-27 2000-09-28 Securing element for electronically securing articles

Country Status (11)

Country Link
US (1) US6987453B1 (en)
EP (1) EP1224640B1 (en)
JP (1) JP4625221B2 (en)
AT (1) ATE246831T1 (en)
AU (1) AU777178B2 (en)
DE (2) DE19951561A1 (en)
DK (1) DK1224640T3 (en)
ES (1) ES2203521T3 (en)
NO (1) NO20021911L (en)
NZ (1) NZ517425A (en)
WO (1) WO2001031601A1 (en)

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DE102017207871A1 (en) 2017-05-10 2018-11-15 Tridonic Gmbh & Co Kg Firmware Update-Over-The Air (FOTA) in building technology

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Also Published As

Publication number Publication date
DE50003223D1 (en) 2003-09-11
WO2001031601A1 (en) 2001-05-03
DE19951561A1 (en) 2001-05-03
AU777178B2 (en) 2004-10-07
EP1224640A1 (en) 2002-07-24
NO20021911D0 (en) 2002-04-23
NZ517425A (en) 2003-01-31
ES2203521T3 (en) 2004-04-16
US20060007004A1 (en) 2006-01-12
AU7909500A (en) 2001-05-08
ATE246831T1 (en) 2003-08-15
DK1224640T3 (en) 2003-11-24
JP2003513381A (en) 2003-04-08
JP4625221B2 (en) 2011-02-02
US6987453B1 (en) 2006-01-17
NO20021911L (en) 2002-05-14

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