EP0949598A2 - Electronic anti-theft element - Google Patents
Electronic anti-theft element Download PDFInfo
- Publication number
- EP0949598A2 EP0949598A2 EP99104717A EP99104717A EP0949598A2 EP 0949598 A2 EP0949598 A2 EP 0949598A2 EP 99104717 A EP99104717 A EP 99104717A EP 99104717 A EP99104717 A EP 99104717A EP 0949598 A2 EP0949598 A2 EP 0949598A2
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- EP
- European Patent Office
- Prior art keywords
- barkhausen
- sections
- soft magnetic
- magnetic material
- length
- 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.)
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Classifications
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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
- G08B13/2408—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 ferromagnetic tags
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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
- G08B13/2428—Tag details
- G08B13/2437—Tag layered structure, processes for making layered tags
Definitions
- the invention relates to an element for electronic article surveillance or for the sensor technology, consisting of a strip-shaped or wire-shaped Barkhausen material of length L, which is in an external magnetic Alternating field is excited to emit a characteristic signal, and a soft magnetic material that the Barkhausen material assigned.
- Barkhausen material - also called pulse wires - are both for electronic article surveillance as well as for so-called pulse wire sensors in sensor technology. They are characterized by an almost rectangular Hysteresis curve, i.e. the magnetic reversal in an external magnetic Alternating field occurs almost suddenly, as soon as the field of excitation has reached the predetermined threshold.
- suitable elements are described, for example, in US 4,247,601 US 4,660,025, EP 0 309 679 B1 and EP 0 762 354 A1.
- the sudden magnetic reversal of wire-shaped or strip-shaped Barkhausen materials in an external alternating field is the result of one pronounced uniaxial anisotropy along the longitudinal axis of the wire or the strip.
- This anisotropy suppresses bothersome Turning processes during the magnetic reversal process as well as the formation of terminating domain structures before reaching the panel strength - would but the formation of appropriate structures to round off the Hysteresis curve and thus a deterioration in the switching characteristics to lead.
- an amorphous band or an amorphous wire made of Barkhausen material as a security element for the to use electronic article surveillance.
- the amorphous material at least one further strip of soft magnetic Material associated with which is preferably the ends of the amorphous Material towers.
- the invention has for its object a cost-effective element for to propose electronic article surveillance or for sensor technology, the does not have the aforementioned disadvantages.
- the object is achieved in that the soft magnetic material individual sections of a predetermined length, which in one predetermined distance from each other, and that the sections the soft magnetic material with respect to the Barkhausen material are positioned that the magnetic stray fields generated by them with the Coupling magnetization of the Barkhausen material.
- the stray field coupling stabilizes the biased causes wire-like or strip-like Barkhausen material.
- the stray field coupling stabilizes the biased causes wire-like or strip-like Barkhausen material.
- the corresponding securing elements can be used as continuous straps manufacture. From the tapes, labels can then be created for each Use case length are punched out.
- the sections of the soft magnetic material To couple the sections of the soft magnetic material with the To optimize Barkhausen material, the sections of the arrange soft magnetic material on the Barkhausen material.
- the sections of the soft magnetic material and the Barkhausen material have essentially the same width. Will continue suggested that the sections of the soft magnetic material in the essentially evenly distributed over the length of the Barkhausen material are.
- the invention For use as pulse wires in sensors, the invention has Element the advantage that the ends are not covered. This will make it possible, the distance between the actual sensor and the field source to keep low. Especially with such sensors, but increasingly Dimensions also for elements for electronic article surveillance (especially for small articles) is an embodiment of the invention Switching element to be regarded as particularly favorable, in which - as already mentioned - The length of the strip-shaped or wire-shaped Barkhausen material is chosen relatively low. By coordinating the length, the distance and the permeability of the sections of the soft magnetic material can be the characteristic signal of the element for the respective length of the Optimize Barkhausen material. So it enables the invention Solution, the length of known from the prior art Shorten Barkhausen elements by about half without the Panel strength increase dramatically. This inevitably leads to considerable Material savings, which is why the securing elements according to the invention are relatively inexpensive. This is also supported by the previous ones described simple and inexpensive methods of manufacturing.
- an advantageous training suggests that sections a semi-hard or hard magnetic material are provided, which in immediate vicinity of the Barkhausen material and the sections of the soft magnetic Material are arranged.
- An embodiment of an element according to the invention that can be deactivated before that the sections of soft magnetic material and the sections of the semi-hard or hard magnetic material along the length of the Barkhausen material are arranged alternately in succession.
- the sections of the soft magnetic material and the sections of the semi-hard or hard magnetic material and the Barkhausen material in have essentially the same width.
- Fig. 1 shows a schematic representation of the switching behavior of known Barkhausen elements of various lengths in the M-H diagram. While the Hysteresis curve of the longer Barkhausen element - characterized by (I) - runs almost rectangular and thus when the respective one is reached Switching field strengths suddenly magnetized, shows the shorter one Barkhausen element - characterized by (II) - a hysteresis curve on the deviates significantly from the desired rectangular shape. Magnetic reversal no longer occurs suddenly at a given field strength of the external magnetic field H, but continuously while the external Magnetic field passes through a certain area.
- the magnetization in the Barkhausen elements is from the saturated State coming in field H1, when field strength H2 is reached in the lower one Represented area of the drawing. While in the case of the longer one Barkhausen element the magnetization of the edge areas negligible is small, it occurs in the shorter Barkhausen element due to the increased demagnetization effect well before reaching the actual panel strength Hs. The consequence of this is that the Magnetization process of the shorter element is much less sudden runs as that of the longer element. This makes the detection probability in electronic article surveillance systems based on the Generation of higher harmonics of the fundamental frequency of the query field based, drastically reduced.
- FIG. 2 is an perspective view of an embodiment of the invention Elements for electronic article surveillance or for sensor technology shown.
- Fig. 3 shows the embodiment in plan view.
- sections 3 of a soft magnetic material of length a arranged on a strip-shaped Barkhausen material 2 b sections 3 of a soft magnetic material of length a arranged.
- the solution according to the invention is due to stray field couplings stabilization of the prestressed Barkhausen material 2 reached.
- the length a and the Distance b of the sections 3 of the soft magnetic material can do that Switching behavior also decided relatively short Barkhausen elements 1 can be improved without an undesirable increase in intrinsic panel strength would be necessary.
- an intrinsic switching field strength is the switching field strength of an "infinitely" long Barkhausen element designated.
- FIG Fig. 4 A deactivatable embodiment of the element 1 according to the invention is shown in FIG Fig. 4 can be seen in cross section.
- On the strip-shaped Barkhausen material 2 are at a distance b from each other sections 3 of length a made of soft magnetic Material arranged.
- sections 4 of a semi-hard or hard magnetic material are arranged. Sections 4 are used in a known manner to deactivate the Fuse element 1. Is such a high on the fuse element 1 Magnetic field applied that the sections 4 of the semi-hard or hard magnetic Materials are driven to saturation, so they prevent subsequently a reaction of the Barkhausen material 2 to the outside magnetic query field H.
- Fig. 5 shows a schematic representation of the switching behavior of the Elements 1 according to the invention for electronic article surveillance or for the sensor technology. While the strip or wire Barkhausen material 2 taken by itself the already mentioned several times has a rectangular hysteresis curve, the hysteresis curve has Sections 3 of the soft magnetic material have a typically sheared shape.
- the solution according to the invention is characterized in that a strip-like or wire-like Barkhausen material 2 of short length L is used. Without those arranged on the Barkhausen material 2 Sections 3 of the soft magnetic material would change the hysteresis curve into Fig. 1 shown rounded shape (hysteresis curve II).
- Barkhausen material 2 becomes prestressed Barkhausen material 2 stabilized due to stray field coupling. That also has the short Barkhausen element 1 shows a rectangular hysteresis curve and consequently shows the desired switching behavior when applying an external magnetic Alternating field H.
Abstract
Description
Die Erfindung betrifft ein Element für die elektronische Artikelsicherung oder für die Sensortechnik, bestehend aus einem streifenförmigen oder drahtförmigen Barkhausenmaterial der Länge L, das in einem externen magnetischen Wechselfeld zur Aussendung eines charakteristischen Signals angeregt wird, und einem weichmagnetischen Material, das dem Barkhausenmaterial zugeordnet ist.The invention relates to an element for electronic article surveillance or for the sensor technology, consisting of a strip-shaped or wire-shaped Barkhausen material of length L, which is in an external magnetic Alternating field is excited to emit a characteristic signal, and a soft magnetic material that the Barkhausen material assigned.
Elemente aus Barkhausenmaterial - auch Pulsdrähte genannt - werden sowohl für die elektronische Artikelsicherung als auch für sog. Impulsdrahtsensoren in der Sensortechnik eingesetzt. Sie zeichnen sich durch eine nahezu rechteckige Hysteresekurve aus, d.h., die Ummagnetisierung in einem äußeren magnetischen Wechselfeld erfolgt quasi schlagartig, sobald das Erregerfeld den vorgegebenen Schwellenwert erreicht hat. Für die elektronische Artikelsicherung geeignete Elemente werden beispielsweise in der US 4 247 601, der US 4 660 025, der EP 0 309 679 B1 und der EP 0 762 354 A1 beschrieben.Elements made of Barkhausen material - also called pulse wires - are both for electronic article surveillance as well as for so-called pulse wire sensors in sensor technology. They are characterized by an almost rectangular Hysteresis curve, i.e. the magnetic reversal in an external magnetic Alternating field occurs almost suddenly, as soon as the field of excitation has reached the predetermined threshold. For electronic article surveillance suitable elements are described, for example, in US 4,247,601 US 4,660,025, EP 0 309 679 B1 and EP 0 762 354 A1.
Das schlagartige Ummagnetisieren von drahtförmigen oder streifenförmigen Barkhausenmaterialien in einem äußeren Wechselfeld ist die Folge einer ausgeprägten einachsigen Anisotropie entlang der Längsachse des Drahtes oder des Streifens. Diese Anisotropie unterdrückt sowohl störende Drehprozesse während des Ummagnetisierungsvorgangs als auch die Bildung von Abschlußdomänenstrukturen vor Erreichen der Schaltfeldstärke - würde doch die Bildung entsprechender Strukturen zu einer Abrundung der Hysteresekurve und damit zu einer Verschlechterung der Schaltcharakteristik führen.The sudden magnetic reversal of wire-shaped or strip-shaped Barkhausen materials in an external alternating field is the result of one pronounced uniaxial anisotropy along the longitudinal axis of the wire or the strip. This anisotropy suppresses bothersome Turning processes during the magnetic reversal process as well as the formation of terminating domain structures before reaching the panel strength - would but the formation of appropriate structures to round off the Hysteresis curve and thus a deterioration in the switching characteristics to lead.
Die zur Bildung einer ausgeprägt rechteckigen Hysteresekurve erforderliche Anisotropie kann verschiedene Ursachen haben. Aus der Patentliteratur sind Methoden bekannt geworden, die spannungsinduzierte (US-PS 4,660,025) oder magnetfeldinduzierte Anisotropien (EP 0 762 354 A1) verwenden. Allen Methoden gemeinsam ist allerdings, daß zur Unterstützung der induzierten Anisotropien eine ausgeprägte Form-Anisotropie notwendig ist, um das ausgeprägte Schaltverhalten zu erzielen. Eine Verkürzung der in der Regel langgestreckten Streifen oder Drähte bewirkt eine Abnahme der Form-Anisotropie und eine Zunahme des Entmagnetisierungseffekts, wodurch die Reckteckform der Hysteresekurve reduziert wird.The one required to form a distinctly rectangular hysteresis curve Anisotropy can have different causes. Are from the patent literature Methods become known, the voltage-induced (US-PS 4,660,025) or use magnetic field-induced anisotropies (EP 0 762 354 A1). Everyone Common to methods, however, is that to support induced Anisotropy A pronounced shape anisotropy is necessary to achieve this to achieve pronounced switching behavior. A shortening of the rule elongated strips or wires cause a decrease in shape anisotropy and an increase in the demagnetizing effect, causing the Rectangular shape of the hysteresis curve is reduced.
Eine Erhöhung der intrinsischen Anisotropie, wie beispielsweise in der EP 0 762 354 A1 für kurze Etiketten vorgeschlagen, würde zwar die Abnahme der Form-Anisotropie bzw. die Zunahme des Entmagnetisierungsfaktors zumindest teilweise kompensieren; gleichzeitig würde sie jedoch zu einer Erhöhung der Schaltfeldstärke führen, was für die Anwendung in Systemen zur elektronischen Artikelsicherung unerwünscht ist.An increase in intrinsic anisotropy, as for example in EP 0 762 354 A1 for short labels, the acceptance of the Shape anisotropy or the increase in the demagnetization factor at least partially compensate; at the same time, however, it would increase the Switchgear panel strength, leading to use in electronic systems Article security is undesirable.
Aus der Patentliteratur sind bereits alternative Lösungen bekannt geworden, wie das entmagnetisierende Feld in den Endbereichen des Barkhausenmaterials, das ja die unerwünschten Ummagnetisierungsprozesse bewirkt, unterdrückt werden kann. So wird in der EP 0 710 923 A2 ein magnetisches Markierungselement beschrieben, das aus einem dünnen magnetischen Draht aus Barkhausenmaterial besteht, in dessen beiden Endbereichen zwei weichmagnetische Plättchen angeordnet sind, die eine kleinere Koerzitivkraft haben als der Draht aus Barkhausenmaterial. Zwecks Erhöhung der Pulshöhe bedecken die Plättchen die Streifenenden und ragen vorzugsweise nach allen Seiten hin über die Enden hinaus.Alternative solutions have already become known from the patent literature, like the demagnetizing field in the end areas of the Barkhausen material, that causes the unwanted magnetic reversal processes, can be suppressed. So in EP 0 710 923 A2 a magnetic Marker element described, which is made of a thin magnetic wire consists of Barkhausen material, in its two end areas two soft magnetic Platelets are arranged, which have a smaller coercive force than the wire made of Barkhausen material. To increase the pulse height the platelets cover the ends of the strips and preferably protrude towards all of them Sides over the ends.
Aus der EP 0 762 354 A1 ist es bekannt geworden, ein amorphes Band oder einen amorphen Draht aus Barkhausenmaterial als Sicherungselement für die elektronische Artikelsicherung zu verwenden. Zur Erhöhung der Pulshöhe ist dem amorphen Material zumindest ein weiterer Streifen aus weichmagnetischem Material zugeordnet, der vorzugsweise die Enden des amorphen Materials überragt.It has become known from EP 0 762 354 A1, an amorphous band or an amorphous wire made of Barkhausen material as a security element for the to use electronic article surveillance. To increase the pulse height is the amorphous material at least one further strip of soft magnetic Material associated with which is preferably the ends of the amorphous Material towers.
Beide Lösungen des Standes der Technik haben den Nachteil, daß sie sich nicht für eine kontinuierliche Fertigung von Bändern eignen, aus denen später Etiketten unterschiedlicher Länge gestanzt werden. Der Grund liegt darin, daß die weichmagnetischen Streifen an den Enden der Etiketten positioniert sein müssen, wobei jedoch die Position während der Fertigung in der Regel nicht bestimmbar ist.Both solutions of the prior art have the disadvantage that they are not suitable for continuous production of tapes from which later Labels of different lengths can be punched. The reason is that the soft magnetic strips can be positioned at the ends of the labels must, however, the position usually not during production is determinable.
Der Erfindung liegt die Aufgabe zugrunde, ein kostengünstiges Element für die elektronische Artikelsicherung oder für die Sensortechnik vorzuschlagen, das die zuvorgenannten Nachteile nicht aufweist.The invention has for its object a cost-effective element for to propose electronic article surveillance or for sensor technology, the does not have the aforementioned disadvantages.
Die Aufgabe wird dadurch gelöst, daß das weichmagnetische Material aus einzelnen Abschnitten einer vorgegebenen Länge besteht, die in einem vorgegebenen Abstand voneinander angeordnet sind, und daß die Abschnitte des weichmagnetischen Materials bezüglich des Barkhausenmaterials derart positioniert sind, daß die von ihnen erzeugten magnetischen Streufelder mit der Magnetisierung des Barkhausenmaterials koppeln.The object is achieved in that the soft magnetic material individual sections of a predetermined length, which in one predetermined distance from each other, and that the sections the soft magnetic material with respect to the Barkhausen material are positioned that the magnetic stray fields generated by them with the Coupling magnetization of the Barkhausen material.
Durch die Streufeldkopplung wird eine Stabilisierung des vorgespannten drahtförmigen oder streifenförmigen Barkhausenmaterials bewirkt. Durch die Anordnung der weichmagnetischen Abschnitte längs des streifenförmigen bzw. drahtförmigen Barkhausenmaterials wird das innere Feld des Elements reduziert, und zwar nicht nur -wie im Stand der Technik beschrieben- in den Endbereichen. Hierdurch wird -wie nachfolgend noch näher erläutert- der eigentliche Schaltbereich gezielt stabilisiert, bis die intrinsische Schaltfeldstärke erreicht ist, welche letztlich durch induzierte Anisotropien und damit durch die Domänenwand-Beweglichkeit bestimmt ist.The stray field coupling stabilizes the biased causes wire-like or strip-like Barkhausen material. Through the Arrangement of the soft magnetic sections along the strip-shaped or wire-shaped Barkhausen material becomes the inner field of the element reduced, and not only - as described in the prior art - in the End areas. This will - as will be explained in more detail below - Actual switching range is stabilized in a targeted manner until the intrinsic switching field strength is reached, which is ultimately due to induced anisotropies and thus is determined by the domain wall mobility.
Da bei der erfindungsgemäßen Lösung eine Bedeckung der Enden des drahtförmigen oder streifenförmigen Barkhausenmaterials nicht erforderlich ist, lassen sich die entsprechenden Sicherungselemente als kontinuierliche Bänder fertigen. Aus den Bändern können dann Etiketten einer für den jeweiligen Anwendungsfall benötigten Länge ausgestanzt werden. Since in the solution according to the invention covering the ends of the wire or strip-shaped Barkhausen material is not required, the corresponding securing elements can be used as continuous straps manufacture. From the tapes, labels can then be created for each Use case length are punched out.
Ein besonders günstiges Verfahren zur Herstellung der erfindungsgemäßen Sicherungselemente ist in der DE 196 31 852 A1 beschrieben. Zwar bezieht sich das aus diesem Stand der Technik bekannt gewordenen Verfahren auf die Fertigung von deaktivierbaren weichmagnetischen Streifenelementen; ersetzt man jedoch das aktivierbare weichmagnetische Material der deutschen Offenlegungsschrift durch streifenförmiges oder drahtförmiges Barkhausenmaterial und das halbhart- oder hartmagnetische Deaktivatormaterial durch weichmagnetisches Material, so ist das bekannt gewordene Verfahren analog auf die Herstellung der erfindungsgemäßen Sicherungselemente übertragbar. Der Offenbarungsgehalt der DE 196 31 852 A1 wird hiermit ausdrücklich in die Beschreibung der vorliegenden Erfindung einbezogen.A particularly favorable process for the production of the invention Securing elements are described in DE 196 31 852 A1. Relates the method known from this prior art relates to the Manufacture of deactivatable soft magnetic strip elements; replaced but the activatable soft magnetic material of the German Disclosure by strip or wire Barkhausen material and through the semi-hard or hard magnetic deactivator material soft magnetic material, the method that has become known is analog transferable to the manufacture of the securing elements according to the invention. The disclosure content of DE 196 31 852 A1 is hereby expressly included in the Description of the present invention included.
Selbstverständlich kann das erfindungsgemäße Element für die Artikelsicherung oder die Sensortechnik auch nach allen weiteren bekannt gewordenen Verfahren zur Herstellung von deaktivierbaren Streifenelementen gefertigt werden. Erwähnt sei hier insbesondere noch das Herstellungsverfahren, das in der EP 0 680 011 A1 beschrieben wird.Of course, the element according to the invention for article security or the sensor technology also known after all others process for the production of deactivatable strip elements are manufactured. The manufacturing process should also be mentioned here, which is described in EP 0 680 011 A1.
Um die Kopplung der Abschnitte des weichmagnetischen Materials mit dem Barkhausenmaterial zu optimieren, wird vorgeschlagen, die Abschnitte des weichmagnetischen Materials auf dem Barkhausenmaterial anzuordnen.To couple the sections of the soft magnetic material with the To optimize Barkhausen material, the sections of the arrange soft magnetic material on the Barkhausen material.
Gemäß einer bevorzugten Ausgestaltung des erfindungsgemäßen Elements ist vorgesehen, daß die Abschnitte des weichmagnetischen Materials und das Barkhausenmaterial im wesentlichen die gleiche Breite haben. Weiterhin wird vorgeschlagen, daß die Abschnitte des weichmagnetischen Materials im wesentlichen gleichmäßig über die Länge des Barkhausenmaterials verteilt sind.According to a preferred embodiment of the element according to the invention provided that the sections of the soft magnetic material and the Barkhausen material have essentially the same width. Will continue suggested that the sections of the soft magnetic material in the essentially evenly distributed over the length of the Barkhausen material are.
Für die Anwendung als Impulsdrähte in Sensoren hat das erfindungsgemäße Element den Vorteil, daß die Enden nicht bedeckt sind. Hierdurch wird es möglich, den Abstand zwischen dem eigentlichen Sensor und der Feldquelle gering zu halten. Gerade bei derartigen Sensoren, aber in zunehmendem Maße auch bei Elementen für die elektronische Artikelsicherung (insbesondere bei kleinen Artikeln), ist eine Ausgestaltung des erfindungsgemäßen Schaltelements als besonders günstig anzusehen, bei der - wie bereits erwähnt - die Länge des streifenförmigen oder drahtförmigen Barkhausenmaterials relativ gering gewählt ist. Durch Abstimmung der Länge, des Abstandes und der Permeabilität der Abschnitte des weichmagnetischen Materials läßt sich das charakteristische Signal des Elements für die jeweilige Länge des Barkhausenmaterials optimieren. So ermöglicht es die erfindungsgemäße Lösung, die Länge von aus dem Stand der Technik bekannt gewordenen Barkhausenelementen um ca. die Hälfte zu verkürzen, ohne die Schaltfeldstärke drastisch zu erhöhen. Dies führt zwangsläufig zu erheblichen Materialeinsparungen, weshalb die erfindungsgemäßen Sicherungselemente relativ kostengünstig sind. Unterstützt wird dies auch durch die zuvor beschriebenen einfachen und kostengünstigen Methoden der Fertigung.For use as pulse wires in sensors, the invention has Element the advantage that the ends are not covered. This will make it possible, the distance between the actual sensor and the field source to keep low. Especially with such sensors, but increasingly Dimensions also for elements for electronic article surveillance (especially for small articles) is an embodiment of the invention Switching element to be regarded as particularly favorable, in which - as already mentioned - The length of the strip-shaped or wire-shaped Barkhausen material is chosen relatively low. By coordinating the length, the distance and the permeability of the sections of the soft magnetic material can be the characteristic signal of the element for the respective length of the Optimize Barkhausen material. So it enables the invention Solution, the length of known from the prior art Shorten Barkhausen elements by about half without the Panel strength increase dramatically. This inevitably leads to considerable Material savings, which is why the securing elements according to the invention are relatively inexpensive. This is also supported by the previous ones described simple and inexpensive methods of manufacturing.
Um die erfindungsgemäßen Sicherungs- bzw. Sensorelemente deaktivierbar auszugestalten, schlägt eine vorteilhatte Weiterbildung vor, daß Abschnitte eines halbhart- oder hartmagnetischen Materials vorgesehen sind, die in unmittelbarer Nähe des Barkhausenmaterials und der Abschnitte des weichmagnetischen Materials angeordnet sind.Can be deactivated around the fuse or sensor elements according to the invention To design, an advantageous training suggests that sections a semi-hard or hard magnetic material are provided, which in immediate vicinity of the Barkhausen material and the sections of the soft magnetic Material are arranged.
Eine Ausgestaltung eines deaktivierbaren erfindungsgemäßen Elements sieht vor, daß die Abschnitte des weichmagnetischen Materials und die Abschnitte des halbhart- oder hartmagnetischen Materials entlang der Länge des Barkhausenmaterials abwechselnd aufeinander folgend angeordnet sind.An embodiment of an element according to the invention that can be deactivated before that the sections of soft magnetic material and the sections of the semi-hard or hard magnetic material along the length of the Barkhausen material are arranged alternately in succession.
Gemäß einer vorteilhaften Weiterbildung des erfindungsgemäßen Elements für die elektronische Artikelsicherung oder die Sensortechnik ist vorgesehen, daß die Abschnitte des weichmagnetischen Materials und die Abschnitte des halbhart- oder hartmagnetischen Materials und das Barkhausenmaterial im wesentlichen dieselbe Breite haben.According to an advantageous development of the element according to the invention for electronic article surveillance or sensor technology is provided that the sections of the soft magnetic material and the sections of the semi-hard or hard magnetic material and the Barkhausen material in have essentially the same width.
Die Erfindung wird anhand der nachfolgenden Figuren näher erläutert. Es zeigt:
Fig. 1 zeigt eine schematische Darstellung des Schaltverhaltens von bekannten Barkhausenelementen verschiedener Länge im M-H-Diagramm. Während die Hysteresekurve des längeren Barkhausenelements - gekennzeichnet durch (I) - nahezu rechteckförmig verläuft und damit bei Erreichen der jeweiligen Schaltfeldstärken schlagartig ummagnetisiert, weist das kürzere Barkhausenelement - gekennzeichnet durch (II) - eine Hysteresekurve auf, die von der gewünschten Rechteckform erheblich abweicht. Die Ummagnetisierung erfolgt hier nicht mehr schlagartig bei einer vorgegebenen Feldstärke des äußeren Magnetfeldes H, sondern kontinuierlich, während das äußere Magnetfeld einen gewissen Bereich durchläuft.Fig. 1 shows a schematic representation of the switching behavior of known Barkhausen elements of various lengths in the M-H diagram. While the Hysteresis curve of the longer Barkhausen element - characterized by (I) - runs almost rectangular and thus when the respective one is reached Switching field strengths suddenly magnetized, shows the shorter one Barkhausen element - characterized by (II) - a hysteresis curve on the deviates significantly from the desired rectangular shape. Magnetic reversal no longer occurs suddenly at a given field strength of the external magnetic field H, but continuously while the external Magnetic field passes through a certain area.
Die Magnetisierung in den Barkhausenelementen ist, aus dem gesättigten Zustand beim Feld H1 kommend, bei Erreichen der Feldstärke H2 im unteren Bereich der Zeichnung dargestellt. Während im Falle des längeren Barkhausenelements die Ummagnetisierung der Randbereiche vernachlässigbar gering ist, tritt sie bei dem kürzeren Barkhausenelement aufgrund des erhöhten Entmagnetisierungseffekts bereits deutlich vor dem Erreichen der eigentlichen Schaltfeldstärke Hs auf. Die Folge davon ist, daß der Ummagnetisierungsprozeß des kürzeren Elements weit weniger schlagartig verläuft als der des längeren Elements. Hierdurch wird die Detektionswahrscheinlichkeit in elektronischen Artikelüberwachungssystemen, die auf der Erzeugung höherer Harmonischer der Grundfrequenz des Abfragefeldes basiert, drastisch verringert.The magnetization in the Barkhausen elements is from the saturated State coming in field H1, when field strength H2 is reached in the lower one Represented area of the drawing. While in the case of the longer one Barkhausen element the magnetization of the edge areas negligible is small, it occurs in the shorter Barkhausen element due to the increased demagnetization effect well before reaching the actual panel strength Hs. The consequence of this is that the Magnetization process of the shorter element is much less sudden runs as that of the longer element. This makes the detection probability in electronic article surveillance systems based on the Generation of higher harmonics of the fundamental frequency of the query field based, drastically reduced.
In Fig. 2 ist in perspektivischer Ansicht eine Ausführungsform des erfindungsgemäßen
Elements für die elektronische Artikelsicherung bzw. für die Sensortechnik
dargestellt. Fig. 3 zeigt die Ausführungsform in Draufsicht.
Auf einem streifenförmigen Barkhausenmaterials 2 sind im Abstand b
voneinander Abschnitte 3 eines weichmagnetischen Materials der Länge a
angeordnet. Durch die erfindungsgemäße Lösung wird infolge von Streufeldkopplungen
eine Stabilisierung des vorgespannten Barkhausenmaterials 2
erreicht. Durch gezielte Optimierung der Permeabilität P, der Länge a und des
Abstandes b der Abschnitte 3 des weichmagnetischen Materials kann das
Schaltverhalten auch relativ kurzer Barkhausenelemente 1 entschieden
verbessert werden, ohne daß dazu eine unerwünschte Erhöhung der
intrinsischen Schaltfeldstärke notwendig wäre. Als intrinsische Schaltfeldstärke
wird hierbei die Schaltfeldstärke eines "unendlich" langen Barkhausenelements
bezeichnet.2 is an perspective view of an embodiment of the invention
Elements for electronic article surveillance or for sensor technology
shown. Fig. 3 shows the embodiment in plan view.
On a strip-shaped Barkhausen material 2
Eine deaktivierbare Ausführungsform des erfindungsgemäßen Elements 1 ist in
Fig. 4 im Querschnitt zu sehen. Auf dem streifenförmigen Barkhausenmaterial 2
sind im Abstand b voneinander Abschnitte 3 der Länge a aus weichmagnetischem
Material angeordnet. Unter dem streifenförmigen Barkhausenmaterial 2
sind Abschnitte 4 eines halbhart- oder hartmagnetischen Materials angeordnet.
Die Abschnitte 4 dienen in bekannter Weise der Deaktivierung des
Sicherungselements 1. Wird an das Sicherungelement 1 ein so hohes
Magnetfeld angelegt, daß die Abschnitte 4 des halbhart- oder hartmagnetischen
Materials in die Sättigung getrieben werden, so unterbinden sie
nachfolgend eine Reaktion des Barkhausenmaterials 2 auf das äußere
magnetische Abfragefeld H.A deactivatable embodiment of the
Fig. 5 zeigt eine schematische Darstellung des Schaltverhaltens des
erfindungsgemäßen Elements 1 für die elektronische Artikelsicherung bzw. für
die Sensortechnik. Während das streifenförmige bzw. drahtförmige
Barkhausenmaterial 2 für sich genommen die bereits mehrfach erwähnte
rechteckförmige Hysteresekurve aufweist, hat die Hysteresekurve der
Abschnitte 3 des weichmagnetischen Materials eine typisch gescherte Form.
Die erfindungsgemäße Lösung zeichnet sich nun gerade dadurch aus, daß ein
streifenförmiges oder drahtförmiges Barkhausenmaterial 2 geringer Länge L
verwendet wird. Ohne die auf dem Barkhausenmaterial 2 angeordneten
Abschnitte 3 des weichmagnetischen Materials würde die Hystereskurve die in
Fig. 1 gezeigte abgerundete Form (Hysteresekurve II) haben. Durch die
regelmäßige Anordnung der Abschnitte 3 des weichmagnetischen Materials auf
dem Barkhausenmaterial 2 wird das vorgespannte Barkhausenmaterial 2
infolge der Streufeldkopplung stabilisiert. Damit hat auch das kurze
Barkhausenelement 1 eine rechteckförmige Hysteresekurve und zeigt folglich
das gewünschte Schaltverhalten bei Anlegen eines äußeren magnetischen
Wechselfeldes H.Fig. 5 shows a schematic representation of the switching behavior of the
Claims (8)
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
daß die Abschnitte (3) des weichmagnetischen Materials auf dem Barkhausenmaterial (2) angeordnet sind.Device according to claim 1,
characterized,
that the sections (3) of the soft magnetic material are arranged on the Barkhausen material (2).
dadurch gekennzeichnet,
daß die Abschnitte (3) des weichmagnetischen Materials und das Barkhausenmaterial (2) im wesentlichen die gleiche Breite haben.Device according to claim 1 or 2,
characterized,
that the sections (3) of the soft magnetic material and the Barkhausen material (2) have essentially the same width.
dadurch gekennzeichnet,
daß die Abschnitte (3) des weichmagnetischen Materials im wesentlichen gleichmäßig über die Länge (L) des Barkhausenmaterials (2) verteilt sind.Device according to claim 1, 2 or 3
characterized,
that the sections (3) of the soft magnetic material are distributed substantially uniformly over the length (L) of the Barkhausen material (2).
dadurch gekennzeichnet,
daß die Länge L des Barkhausenmaterials (2) so gering wie möglich gewählt ist und daß durch Abstimmung der Länge (a), des Abstandes (b) und der Permeabilität (P) der Abschnitte (3) des weichmagnetischen Materials das charakteristische Signal des Elements (1) für die jeweilige Länge (L) des Barkhausenmaterials (2) optimiert ist.Device according to claim 1 or 4,
characterized,
that the length L of the Barkhausen material (2) is chosen to be as short as possible and that by coordinating the length (a), the distance (b) and the permeability (P) of the sections (3) of the soft magnetic material, the characteristic signal of the element ( 1) is optimized for the respective length (L) of the Barkhausen material (2).
dadurch gekennzeichnet,
daß Abschnitte (4) eines halbhart- oder hartmagnetischen Materials vorgesehen sind, die in unmittelbarer Nähe des Barkhausenmaterials (2) und der Abschnitte (3) des weichmagnetischen Materials angeordnet sind.Device according to claim 1 or 5,
characterized,
that sections (4) of a semi-hard or hard magnetic material are provided, which are arranged in the immediate vicinity of the Barkhausen material (2) and the sections (3) of the soft magnetic material.
dadurch gekennzeichnet,
daß die Abschnitte (3) des weichmagnetischen Materials und die Abschnitte (4) des halbhart- oder hartmagnetischen Materials entlang der Länge (L) des Barkhausenmaterials (2) abwechselnd aufeinander folgend angeordnet sind.Device according to claim 1 or 6,
characterized,
that the sections (3) of the soft magnetic material and the sections (4) of the semi-hard or hard magnetic material are arranged alternately in succession along the length (L) of the Barkhausen material (2).
dadurch gekennzeichnet,
daß die Abschnitte (3) des weichmagnetischen Materials und die Abschnitte (4) des halbhart- oder hartmagnetischen Materials und das Barkhausenmaterial (2) im wesentlichen dieselbe Breite haben.Device according to one or more of the preceding claims,
characterized,
that the sections (3) of the soft magnetic material and the sections (4) of the semi-hard or hard magnetic material and the Barkhausen material (2) have substantially the same width.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19815583 | 1998-04-08 | ||
| DE19815583A DE19815583A1 (en) | 1998-04-08 | 1998-04-08 | Element for electronic article surveillance or for sensor technology |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0949598A2 true EP0949598A2 (en) | 1999-10-13 |
| EP0949598A3 EP0949598A3 (en) | 2000-11-22 |
| EP0949598B1 EP0949598B1 (en) | 2003-12-03 |
Family
ID=7863889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99104717A Expired - Lifetime EP0949598B1 (en) | 1998-04-08 | 1999-03-10 | Electronic anti-theft element |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6259368B1 (en) |
| EP (1) | EP0949598B1 (en) |
| JP (1) | JP4159697B2 (en) |
| DE (2) | DE19815583A1 (en) |
| DK (1) | DK0949598T3 (en) |
| ES (1) | ES2212404T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8244632B2 (en) | 2001-10-26 | 2012-08-14 | First Data Corporation | Automated transfer with stored value |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6690279B1 (en) * | 1998-07-22 | 2004-02-10 | Meto International Gmbh | Security element for the electronic surveillance of articles |
| DE19958466A1 (en) | 1999-12-04 | 2001-06-07 | Meto International Gmbh | Device and method for indicating the status of EM or AM security tags |
| CN1388837A (en) * | 2000-07-17 | 2003-01-01 | 日本发条株式会社 | Magnetic marker and its manufactring method |
| ES2268964B1 (en) * | 2005-04-21 | 2008-04-16 | Micromag 2000, S.L. | "ACTIVABLE / DEACTIVABLE MAGNETIC LABEL BASED ON MAGNETIC MICROWAVE AND METHOD OF OBTAINING THE SAME". |
| RU2292588C1 (en) * | 2005-07-12 | 2007-01-27 | Бетелин Владимир Борисович | Device for identification and method for scanning the same |
| EP2269018A4 (en) * | 2008-04-18 | 2013-09-25 | Metglas Inc | Remote temperature sensing device and related remote temperature sensing method |
| CN102007391B (en) * | 2008-04-18 | 2013-12-25 | 梅特格拉斯公司 | Temperature sensor and related remote temperature sensing method |
| DE102009043462A1 (en) * | 2009-09-30 | 2011-03-31 | Vacuumschmelze Gmbh & Co. Kg | Magnetic strip, sensor comprising a magnetic strip and method of making a magnetic strip |
| JP2014171044A (en) * | 2013-03-01 | 2014-09-18 | Yokohama National Univ | Electrical pulse generation apparatus and electrical pulse generation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0710923A2 (en) * | 1994-11-02 | 1996-05-08 | Unitika Ltd. | Magnetic marker |
| US5519379A (en) * | 1995-04-10 | 1996-05-21 | Sensormatic Electronics Corporation | Multi-thread re-entrant marker with simultaneous switching |
| EP0762354A1 (en) * | 1995-09-09 | 1997-03-12 | Vacuumschmelze GmbH | Elongated bodies as security label for electromagnetic theft security systems |
| EP0789340A1 (en) * | 1996-02-09 | 1997-08-13 | Esselte Meto International GmbH | Security element for electronic article surveillance |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1234891A (en) * | 1983-10-20 | 1988-04-05 | 746278 Ontario Limited D/B/A I.D. Systems Canada | Security system label |
| GB8713353D0 (en) * | 1987-06-08 | 1987-07-15 | Scient Generics Ltd | Magnetic article surveillance systems |
| US4829288A (en) * | 1987-11-30 | 1989-05-09 | Minnesota Mining And Manufacturing Company | Economic, multi-directionally responsive marker for use in electronic article surveillance systems |
| US4882569A (en) * | 1988-07-26 | 1989-11-21 | Security Tag Systems, Inc. | Deactivatable fequency-dividing-transponder tag |
| US5554974A (en) * | 1994-11-23 | 1996-09-10 | International Business Machines Corporation | Encodable tag with radio frequency readout |
| CA2189827A1 (en) * | 1995-11-08 | 1997-05-09 | Tatsuya Matsumoto | Antitheft label |
| US5835016A (en) * | 1997-12-15 | 1998-11-10 | Sensormatic Electronics Corporation | Multi-thread re-entrant marker with transverse anisotropy flux concentrators |
| US6023226A (en) * | 1998-01-29 | 2000-02-08 | Sensormatic Electronics Corporation | EAS marker with flux concentrators having magnetic anisotropy oriented transversely to length of active element |
-
1998
- 1998-04-08 DE DE19815583A patent/DE19815583A1/en not_active Withdrawn
-
1999
- 1999-03-10 DK DK99104717T patent/DK0949598T3/en active
- 1999-03-10 EP EP99104717A patent/EP0949598B1/en not_active Expired - Lifetime
- 1999-03-10 DE DE59907905T patent/DE59907905D1/en not_active Expired - Fee Related
- 1999-03-10 ES ES99104717T patent/ES2212404T3/en not_active Expired - Lifetime
- 1999-04-07 JP JP09964999A patent/JP4159697B2/en not_active Expired - Fee Related
- 1999-04-08 US US09/288,102 patent/US6259368B1/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0710923A2 (en) * | 1994-11-02 | 1996-05-08 | Unitika Ltd. | Magnetic marker |
| US5519379A (en) * | 1995-04-10 | 1996-05-21 | Sensormatic Electronics Corporation | Multi-thread re-entrant marker with simultaneous switching |
| EP0762354A1 (en) * | 1995-09-09 | 1997-03-12 | Vacuumschmelze GmbH | Elongated bodies as security label for electromagnetic theft security systems |
| EP0789340A1 (en) * | 1996-02-09 | 1997-08-13 | Esselte Meto International GmbH | Security element for electronic article surveillance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8244632B2 (en) | 2001-10-26 | 2012-08-14 | First Data Corporation | Automated transfer with stored value |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11328549A (en) | 1999-11-30 |
| US6259368B1 (en) | 2001-07-10 |
| EP0949598B1 (en) | 2003-12-03 |
| DK0949598T3 (en) | 2004-03-29 |
| DE19815583A1 (en) | 1999-10-14 |
| DE59907905D1 (en) | 2004-01-15 |
| EP0949598A3 (en) | 2000-11-22 |
| JP4159697B2 (en) | 2008-10-01 |
| ES2212404T3 (en) | 2004-07-16 |
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