EP0319637B1 - Système de sécurité magnétique contre le vol, respectivement contre l'intrusion ainsi que capteur-élément de métal approprié à cet effet - Google Patents

Système de sécurité magnétique contre le vol, respectivement contre l'intrusion ainsi que capteur-élément de métal approprié à cet effet Download PDF

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Publication number
EP0319637B1
EP0319637B1 EP88104515A EP88104515A EP0319637B1 EP 0319637 B1 EP0319637 B1 EP 0319637B1 EP 88104515 A EP88104515 A EP 88104515A EP 88104515 A EP88104515 A EP 88104515A EP 0319637 B1 EP0319637 B1 EP 0319637B1
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EP
European Patent Office
Prior art keywords
theft system
field
coil
field coil
wiegand
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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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EP88104515A
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German (de)
English (en)
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EP0319637A2 (fr
EP0319637A3 (fr
Inventor
Erhard Klein
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Karl Harms Handels-Gmbh & Co KG
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Karl Harms Handels-Gmbh & Co KG
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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
    • 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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2474—Antenna or antenna activator geometry, arrangement or layout

Definitions

  • the invention relates to an anti-theft system according to the preamble of claim 1, as is known generically from DE 35 41 536 A1.
  • the sensor wire elements essentially consist of amorphous material, at least part of the wire being crystallizable when deactivated.
  • the sensor wire elements are each driven symmetrically in the area of a periodic magnetic field generated by a field coil, whereby when the magnetic polarity is reversed in the hysteresis loop, a large Barkhausen discontinuity (large Barkhausen jump) arises due to known physical effects, that is to say a normal one "Metal objects atypical signal, but due to the type of control a symmetrical signal.
  • the anti-theft system according to DE 35 41 536 A1 trusts that comparable atypical signals from the induction coil assigned to the field coil are not generated by other objects, and moreover also provides qualitative detection of such an atypical signal for the signal caused thereby Resolution of an alarm is generally satisfied.
  • a first embodiment assumes that the sensor wire element is embedded between the substrate and cover layers, and that two contacts are provided which must penetrate insulation of the sensor wire element, one contact to one The power supply is connected and the other contact is connected to earth, so that a capacitor discharges into a section of the sensor wire element lying between the two contacts and thereby raises its temperature above the voltage relief temperature of the material.
  • a laser is provided, the rays of which are directed onto a part to be crystallized (or the entire wire element) in order to heat it (possibly locally).
  • the sensor element with internal bracing is enclosed in laminate layers which can be shrunk by heat, the laminates being acted upon by hot air for deactivation, so that the sensor element can relax and thus lose its internal bracing.
  • the present invention has for its object to significantly improve the known generic anti-theft system, in particular with regard to its signal identification accuracy and thus to reduce the risk of false alarms in such a way that they are practically excluded.
  • the anti-theft system should not only be simplified and made cheaper with regard to its sensor elements.
  • the (authorized) deactivation of the sensor elements should also be possible considerably more easily and with less effort.
  • a Wiegand wire is known per se. It's a Wiegand wire is a rotating element made of ferromagnetic material, which due to certain treatment during manufacture has a soft magnetic core and a hard magnetic jacket (shell), such as this in US Pat. No. 4,247,601 or the Z. "measure + check / automatic", May 1984, pp. 236-239.
  • a pre-magnetized Wiegand wire rectified (positively or negatively oriented) by a sufficiently strong magnetic field with a saturation field strength rectified (positive or negative orientation) is applied to a core and shell, which (starting with a field strength output value 0 or a relatively low field strength output value) in the opposite direction increases towards the bias field, the magnetization state of the Wiegand wire initially remains in its bias state. If the field strength exceeds a threshold or limit value, also known as the ignition field strength, only the magnetization direction of the soft magnetic core changes when the ignition field strength is reached; this flips up spontaneously.
  • the Wiegand wire is in an induction coil when the magnetization direction of the soft magnetic core is flipped over, the flux change in the induction coil associated with flipping over the core magnetization direction generates a voltage pulse, also known as a reset pulse, with a - due to the magnetic coupling between the core and the shell - relatively small amplitude.
  • the field strength of the magnetic field applied to a Wiegand wire then remains below a second limit value, which, if exceeded, also leads to the magnetic reversal of the hard magnetic shell and if, after the direction of magnetization of the soft magnetic core has been flipped over and the ignition field strength has been exceeded, the applied magnetic field rises again in the original direction, the magnetization direction of the soft magnetic core flips over again when the ignition field strength is reached. Since the magnetic field of the shell is in this state the applied external field and supports it, as it were, the magnetic coupling between the shell and core causes a relatively high flow rate and thus a relatively strong signal, which is quasi-static with an applied periodic alternating field.
  • the anti-theft system according to the invention works with an asymmetrical control of the sensor wire elements and thus with asymmetrical pulse signals that are not generated by "normal" metal objects, there is already a high degree of identification accuracy with relatively simple means and thus an extremely small number of False alarms.
  • a quantitative signal identification is also provided, in which the amplitude of the positive signal is compared with the amplitude of the negative signal (and not only by forming the difference, which is already highly useful in itself, but by forming the quotient) and only then Alarm is triggered when the amplitude ratio of the generated pulses exceeds a predetermined limit value of preferably 3: 1, the proportion of false alarms can be reduced to practically 0 with the anti-theft system according to the invention, since it is practically impossible that any other contradiction an atypical, asymmetrical signal generated, the amplitude ratio then also exceeds a predetermined limit value of 3: 1, for example.
  • FIG. 1 to 3 of the drawing show the use of a security system according to the invention as an anti-theft security system in a supermarket, of which only one space outlet designed as a control gate 1 is shown as an example.
  • the objects to be secured which in the present case are goods 2, which have been taken from a corresponding stock of goods by a customer 3 (e.g. shelves) in order to purchase them, will be purchased by the customer 3 when approaching one of the Check-gate 1 placed in front of cash register 4 on a conveyor belt 5 and conveyed to cashier 6, who types the corresponding prices, which can be found in each case on a price tag 7, into cash register 4 and settles the purchase amount with customer 3.
  • the price tags 7 are shown in FIGS. 4 and 5 in their original size. They each consist of a paper label that can be firmly affixed to the product 2 in question, on the underside of which a section of a Wiegand wire serving as a sensor metal element 8 is fixed. Already at this point it should be pointed out that the sensor metal elements 8 could possibly also be arranged within the goods 2 or their packaging, so that they are not recognizable by customers 3 at all.
  • a field coil 9 is arranged, which is indicated in FIG. 1 with a dash-dotted line. As can be seen in particular from FIG. 3, the field coil 9 surrounds the control gate 1 in a ring. Its height H is 2.2 m and its width B 0.8 m, so that a customer 3 can easily pass the control gate 1 after the billing process.
  • the goods 2 held for sale in the supermarket and offered for purchase are each provided with at least one security label which also forms the price tag 7.
  • This is the case for goods 2.2 and 2.3 (see FIGS. 1 and 2), while goods 2.1 are provided with three security labels 7 (according to FIGS. 4 and 5), the sensor consisting of a Wiegand wire -Metal element 8 in its longitudinal extent according to the arrows x or y or z recognizable in the upper left in FIG. 1 (there the goods 2.1 are partially drawn out in perspective in an enlarged view), the directions x, y and z in each case are perpendicular to each other.
  • the Wiegand wires serving as sensor metal elements 8 are magnetized in their active state. In the case of proper billing, this activation state is thereby converted into a deactivated state (since the theft protection system is not supposed to trigger an alarm when properly purchased) by demagnetizing the Wiegand wires serving as sensor metal elements 8 in the area of the cash register 4.
  • an initially relatively strong alternating magnetic field is generated in the area of the conveyor belt 5 by means of a field coil 10 indicated by a dash-dotted line in FIG. 1, which is directed towards the control gate 1 in FIG its strength is continuously reduced, so that the deactivation of the sensor metal elements 8 takes place automatically when properly purchased.
  • the field coil 10 is shielded from the passage 11 running parallel to the cash register 4.
  • the entire security device is (only) switched on when a customer 3 approaches the area of the cash register 4. If he traverses a light barrier 12 (see FIG. 2), this causes a one-board computer 13 to be switched on, which works for several (possibly all) control gates 1 of the supermarket in question and first of all causes one Frequency generator 14, which also works for several (possibly all) control gates 1 of the supermarket, is put into operation.
  • the frequency generator 14 draws its power supply from the three-phase network and generates a sinusoidal voltage, which is a maximum of 67 V in the illustrated embodiment. It delivers a peak current of 15 A.
  • the alternating frequency generated by the frequency generator 14 is approximately 600 Hz. The frequency automatically regulates the system to the resonance frequency of the field coil 9.
  • the inductive resistance of the field coil 9 is compensated for by an appropriately dimensioned capacitance, a value of 600 Hz corresponding to the frequency generator 14 being selected as the resonance frequency. Since the capacitance is composed of discrete components which are subject not only to a certain tolerance but also to a certain aging, the resonance frequency cannot always be set precisely.
  • the induction coils 15, 15 arranged at a height h of 0.9 m on the two vertical legs of the field coil 9 are also oriented in such a way that they implement changes in the magnetic field, the vector of which points in the direction of the arrow 16.
  • the induction coils 15, 15 are designed so that they have the lowest possible own capacitance and do not contain a metal core.
  • this customer 3 crosses the control gate 1 and thereby reaches an area in which the alternating magnetic field generated by the field coil 9 exceeds the intended ignition field strength of 17 A / cm (on this occasion it should be noted that the leg cross section of the field coil 9 is approximately 8 cm 2, and that the field coil 9 has 150 copper wire windings which can easily be loaded with a peak current of 15 A, the internal resistance being 4 ⁇ , the magnetic field in the center of the coil 17 (see FIG.
  • the induction coils 15, 15, in which the pulses are generated feed them to filter electronics 19, in which the signal applied to the induction coils 15, 15 is amplified and filtered out in such a way that a signal is present at the output of the filter electronics 19, which is sent to the computer 13 is supplied.
  • the computer 13 first checks the probability of whether this signal is also certainly Wiegand pulses that were generated by a Wiegand wire serving as a sensor metal element 8. For this purpose, the computer 13 calculates the amplitude ratio of the amplitude of a positive pulse and a subsequent negative pulse, which are very different if the field strength does not exceed an upper limit value, which in the exemplary embodiment shown is approximately 25 A / cm.
  • the computer 13 assumes, on the basis of appropriate programming, that the pulses determined by it originate from an active, non-deactivated Wiegand wire, and triggers an optical and a flashing light 20 an audible alarm on a signal horn 21, the entrance and exit doors of the supermarket optionally being able to be locked automatically if desired. The customer in question can then be subjected to a corresponding check.
  • the computer 13 detects Wiegand pulses, but on the other hand determines that their amplitude ratio is below the amplitude limit ratio of 3: 1 provided for triggering an alarm, the computer assumes that the label is deactivated, and therefore does not trigger an alarm. This is particularly the case when a Wiegand wire serving as a sensor metal element 8 has been deactivated in the area of the conveyor belt 5 by an initially very strong and then continuously decreasing alternating magnetic field. In this demagnetized state, the amplitudes of positive and negative pulses are the same.
  • the Wiegand wires can easily be glued onto the goods 2 to be secured together with a conventional price tag 7, an approximately 1 cm long Wiegand wire being completely sufficient, and the diameter of which can be, for example, only 0.25 mm.
  • a sensor metal element 8 designed in this way is not, for example, scratched with a fingernail or the like. to render ineffective.
  • such a Wiegand wire 8 then generates a relatively strong, easily evaluable pulse if its longitudinal axis does not deviate too much from the magnetic vector (see arrow 16) of the magnetic field generated by the field coil 9. If a thief carries a correspondingly secured item 2, the sensor metal element 8 of which, for example, happens to be in the vertical direction when crossing the control gate 1, this would not induce a sufficiently strong pulse in the induction coils 15.
  • a second field coil 9 and possibly even a third field coil 9 could possibly - as already explained above installed, the magnetic vector axes of which run at an angle (possibly at right angles) to one another, in which case the security of theft detection is increased accordingly.
  • Another option is there however, it can also be seen in the fact that the installation is not correspondingly complex, but that higher-quality goods are provided with two or three sensor metal elements 8, the longitudinal axes of which are each at an angle, preferably at right angles, to one another. In this way, for example, the object 2.1 indicated in FIGS. 1 and 2 is secured, which is drawn out again on the upper left in FIG.
  • the goods 2.1 are provided with three security labels 7, the sensor metal element 8 of which is designed as a Wiegand wire and extends at right angles to the two other Wiegand wires 8, 8.
  • the sensor metal element 8 of which is designed as a Wiegand wire and extends at right angles to the two other Wiegand wires 8, 8.
  • a thief has no chance of crossing the field coil 9 without triggering an alarm, since one of the Wiegand wires 8 is always in a parallel or quasi-parallel position to the magnetic vector 16 of the field coil 9.
  • Such a fuse with several Wiegand wires 8 is easily justifiable in price, since such sensor metal elements 8 do not cost 6 to 25 Pfg.
  • 0.5 Pfg. So that obviously a material expenditure of less than half a penny is economically viable if practically one hundred percent theft protection can be achieved.
  • the Wiegand wires serving as sensor metal elements 8 can optionally also be integrated into the goods 2 or their packaging, so that a potential thief who is familiar with such a security system has practically no possibility has to track down the sensor metal elements and, if necessary, remove them if he wants to steal a certain item 2.
  • a false alarm is accordingly only conceivable if a customer carries an active Wiegand element which is not a sensor metal element 8 of the security system.
  • Wiegand wires are only used in speed and flow meters, and it is not common to use such devices when shopping in a supermarket, visiting an exhibition or the like. a false alarm is practically impossible.
  • the security system according to the invention is obviously also suitable as a burglar security system, for example also for private households.
  • the outlets leading to the outside such as windows and doors, floor and cellar hatches etc. are each provided with at least one field coil, which is then expediently embedded in the wall surrounding the room outlet or in the floor already during construction (possibly also later) and if the objects to be secured are each provided with a Wiegand wire (in as invisible a place as possible) (in this case, of course, attaching numerous Wiegand wires is also inexpensive to carry)
  • an alarm is then triggered in an analogous manner, if an object secured with at least one Wiegand wire is conveyed to the outside through a room outlet, since then, when the field coil is activated, it triggers a Wiegand pulse in at least one induction coil, which leads to an alarm being triggered when it is detected.
  • a burglar alarm system designed in this way is even more advantageous compared to known burglar alarm systems because it cannot be recognized as such and practically cannot be switched off by unauthorized burglars, since the frequency generator that is preferably to be provided is located somewhere hidden in a house, apartment or the like . so can be installed in such a way that it is practically undetectable, and since it is practically impossible for burglars, especially with larger objects, to search for Wiegand wires, whereby, moreover, they can never be sure whether they are attached to a specific object (e.g. a valuable piece of furniture, a carpet or the like) have actually found all the Wiegand wires if they know the security system as such and have already removed three or four Wiegand wires from an object, for example.
  • a specific object e.g. a valuable piece of furniture, a carpet or the like

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)

Claims (17)

  1. Système antivol conçu pour protéger des objets se trouvant dans un local - en particulier un lieu de vente en libre service tel qu'un supermarché - contre une appropriation illicite, sur lequel
    a) chacun des objets à protéger est muni d'au moins un détecteur en forme d'élément de fil métallique à l'aide duquel sera produit, à l'intérieur d'un champ magnétique périodique généré par une bobine de champ, un signal du type impulsion, si une valeur limite fixée pour l'intensité de champ opposée à l'état de magnétisation dudit détecteur a été dépassée, à l'intérieur d'une bobine d'induction ;
    b) la bobine d'induction est reliée à un dispositif de détection au moyen duquel les signaux générés dans la bobine sont contrôlés et éventuellement transmis à un dispositif d'alarme pour le déclenchement d'une alarme ; et
    c) se trouve un poste de désactivation sur lequel les détecteurs, en forme d'élément de fil métallique, placés sur des objets devant être éliminés du local de manière licite, pourront être désactivés,
       caractérisé par l'utilisation, pour servir d'élément détecteur (8) de (au moins) un tronçon d'un fil Wiegand présentant un noyau magnétique mou et une enveloppe magnétique dure, lequel est activable par pré-magnétisation, tandis que, pour la production connue en soi d'un signal asymétrique par un détecteur activé (8), dans la zone de la bobine de champ (9, 10) et de la bobine d'induction (15) l'amplitude de l'intensité du champ alternatif magnétique générée par ladite bobine de champ (9, 10) est supérieure à l'intensité du champ d'allumage du noyau, mais inférieure à l'intensité du champ d'allumage de l'enveloppe ; et tandis que le signal produit par un détecteur (8) est tout d'abord contrôlé par le dispositif de détection (13) pour savoir s'il s'agit d'un signal asymétrique venant d'un fil Wiegand, dans lequel s'effectue la comparaison entre les amplitudes de l'impulsion positive et de l'impulsion négative, une alarme n'est déclenchée que si le rapport entre les amplitudes des impulsions produites dépasse une valeur limite prédéterminée.
  2. Système antivol selon la revendication 1, caractérisé en ce que les tronçons de fil Wiegand utilisés pour servir d'élément détecteur (8) ont une longueur respective d'environ 5 à 20 mm.
  3. Système antivol selon la revendication 2, caractérisé en ce que les tronçons de fil Wiegand (8) ont une longueur d'environ 1 cm.
  4. Système antivol selon l'une des revendications 1 à 3, caractérisé en ce que les tronçons de fil Wiegand (8) ont un diamètre d'environ 0,15 à 0,4 mm.
  5. Système antivol selon la revendication 4, caractérisé en ce que les tronçons de fil Wiegand (8) ont un diamètre de 0,25 mm.
  6. Système antivol selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que, à chaque sortie (1) d'un local à sécuriser, sont disposées au moins une bobine de champ (9) entourant en forme d'anneau ladite sortie (1) du local ainsi qu'au moins une bobine d'induction (15).
  7. Système antivol selon la revendication 6, caractérisé en ce qu'à une sortie (1) du local sont associées au moins deux bobines de champ (9, 9) dont les axes (16) ou les vecteurs magnétiques forment un angle l'un par rapport à l'autre.
  8. Système antivol selon la revendication 7, caractérisé en ce que, en cas d'une disposition de deux bobines de champ (9, 9) sur une sortie (1) du local, leurs axes (16) ou leurs vecteurs magnétiques sont sensiblement perpendiculaires l'un par rapport à l'autre.
  9. Système antivol selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que la bobine ou les bobines de champ (9, 9) est excitée (ou sont excitées) par un générateur fréquentiel (14) à une fréquence (d'excitation) d'environ 400 à 800 Hz.
  10. Système antivol selon la revendication 9, caractérisé en ce que le générateur fréquentiel (14) se met en circuit automatiquement si une personne (3) s'en approche, et/ou se met hors circuit automatiquement, si une personne (3) s'en éloigne.
  11. Système antivol selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que, à chaque bobine de champ (9), est associée une résistance capacitive, la fréquence de résonance du système de résonance créé par l'inductivité de la bobine (9) et de la capacité associée est sensiblement égale à la fréquence d'excitation du générateur fréquentiel (14) ; et en ce que ledit générateur fréquentiel (14) est réalisé de telle sorte que sa fréquence se règle automatiquement sur la fréquence de résonance respective du système de résonance formé par l'inductivité de la bobine (9) et du système de résonance capacitif qui lui est associé.
  12. Système antivol selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que, sur chacune des deux branches de chaque bobine (9) est disposée une bobine d'induction (15), ces bobines d'induction (15, 15) étant orientées de telle sorte qu'elles transforment les variations du champ magnétique générées par la bobine (9), champ dont le vecteur s'étend parallèlement à l'axe (16) de ladite bobine de champ (9).
  13. Système antivol selon l'une ou plusieurs des revendications précédentes, en particulier la revendication 12, caractérisé en ce qu'en aval de la bobine d'induction (ou des bobines d'induction (15)) est disposé un dispositif de filtrage électronique (19) au moyen duquel des signaux générés par un détecteur (8) seront éliminés par filtrage ; en ce qu'un ordinateur (13) est associé ou subordonné à la bobine d'induction (15) (ou aux bobines d'induction (15, 15)) ou à un amplificateur ou au dispositif de filtrage (19), cet ordinateur (13) devant être activé si une personne (3) s'approche d'une sortie (1) du local ; en ce que ledit ordinateur (13) met alors en circuit le générateur de fréquence (14) ; et en ce que ledit ordinateur (13), faisant alors fonction de dispositifs de détection, lors de la réception d'un signal, procède à son contrôle.
  14. Système antivol selon l'une ou plusieurs des revendications précédentes, en particulier la revendication 13, caractérisé en ce que le dispositif de détection (13) ne déclenche une alarme que si le rapport entre les amplitudes des impulsions générées est égal à (au moins) environ 3:1.
  15. Système antivol selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que la protection d'un objet (2) comporte la présence d'au moins deux tronçons de fil Wiegand (8, 8) formant un angle entre eux.
  16. Système antivol selon la revendication 15, caractérisé en ce que les tronçons (8, 8) de fil Wiegand sont disposés sensiblement perpendiculairement l'un par rapport à l'autre.
  17. Système antivol selon la revendication 15, caractérisé par la présence de plus de deux tronçons (8) de fil Wiegand disposés éventuellement en forme d'hérisson.
EP88104515A 1987-12-10 1988-03-22 Système de sécurité magnétique contre le vol, respectivement contre l'intrusion ainsi que capteur-élément de métal approprié à cet effet Expired - Lifetime EP0319637B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3741780 1987-12-10
DE19873741780 DE3741780A1 (de) 1987-12-10 1987-12-10 Magnetisches diebstahl- bzw. einbruch-sicherungssystem sowie hierfuer geeignetes sensor-metallelement

Publications (3)

Publication Number Publication Date
EP0319637A2 EP0319637A2 (fr) 1989-06-14
EP0319637A3 EP0319637A3 (fr) 1991-07-03
EP0319637B1 true EP0319637B1 (fr) 1995-05-10

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EP88104515A Expired - Lifetime EP0319637B1 (fr) 1987-12-10 1988-03-22 Système de sécurité magnétique contre le vol, respectivement contre l'intrusion ainsi que capteur-élément de métal approprié à cet effet

Country Status (6)

Country Link
US (1) US5008649A (fr)
EP (1) EP0319637B1 (fr)
JP (1) JPH01169600A (fr)
AT (1) ATE122489T1 (fr)
DE (2) DE3741780A1 (fr)
ES (1) ES2074423T3 (fr)

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US5170045A (en) * 1990-03-20 1992-12-08 Esselte Meto Eas Int. Ab Price tag deactivator
SE500627C2 (sv) * 1990-03-20 1994-08-01 Esselte Meto Int Gmbh Handscanner anordnad att optiskt avläsa en streckkod på en vara
NL9002120A (nl) * 1990-09-28 1992-04-16 Nedap Nv Pulsdeactivator.
US5239284A (en) * 1991-01-08 1993-08-24 Kubota Corporation Antitheft device
US5341125A (en) * 1992-01-15 1994-08-23 Sensormatic Electronics Corporation Deactivating device for deactivating EAS dual status magnetic tags
DE4205084A1 (de) * 1992-02-17 1993-09-02 Karl Harms Handels Gmbh & Co K Vorrichtung zum empfangen elektromagnetischer wellen, insbesondere fuer diebstahlsicherungssysteme
US5253821A (en) * 1992-03-02 1993-10-19 Minnesota Mining And Manufacturing Company Security magnetic tape cartridge for use in electronic article surveillance systems
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Also Published As

Publication number Publication date
EP0319637A2 (fr) 1989-06-14
DE3741780C2 (fr) 1990-05-23
US5008649A (en) 1991-04-16
JPH01169600A (ja) 1989-07-04
DE3853767D1 (de) 1995-06-14
DE3741780A1 (de) 1989-06-29
ATE122489T1 (de) 1995-05-15
ES2074423T3 (es) 1995-09-16
EP0319637A3 (fr) 1991-07-03

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