EP0319637A2 - 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
EP0319637A2
EP0319637A2 EP88104515A EP88104515A EP0319637A2 EP 0319637 A2 EP0319637 A2 EP 0319637A2 EP 88104515 A EP88104515 A EP 88104515A EP 88104515 A EP88104515 A EP 88104515A EP 0319637 A2 EP0319637 A2 EP 0319637A2
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EP
European Patent Office
Prior art keywords
arrangement according
sensor
field coil
field
sensor metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88104515A
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German (de)
English (en)
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EP0319637B1 (fr
EP0319637A3 (fr
Inventor
Erhard Klein
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.)
Karl Harms Handels-Gmbh & Co KG
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Karl Harms Handels-Gmbh & Co KG
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Publication of EP0319637A3 publication Critical patent/EP0319637A3/fr
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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 a system or an arrangement for securing objects located in at least one room outlet, in particular a (self-service) sales point (such as a supermarket), against theft or against burglary, the objects to be secured in each case with at least are provided with a magnetically activatable sensor metal element, with a first device for generating a magnetic field to be arranged at each room outlet, in the area of which a magnetically activated sensor metal element arranged on an object to be secured generates a detectable signal when a field strength limit value is exceeded, and with a second device assigned to the first device, by means of which a generated signal is to be detected and sent to an alarm device when it occurs in order to trigger an alarm.
  • a (self-service) sales point such as a supermarket
  • the invention further relates to a sensor metal element suitable for this purpose and the use of a section of a Wiegand wire as a sensor metal element for a magnetic security system of the type in question here.
  • the system according to the invention when used as an intrusion security system, it will generally be a common one Entrance / exit and beyond around windows, floor or cellar hatches and the like. act, i.e. room outlets that are present in a wall, the ceiling or the floor of the room to be secured.
  • Securing goods kept ready for sale against theft in sales outlets is not only necessary for relatively high-quality goods, but also for low-value items, since, unfortunately, such property offenses are not isolated cases that are limited to high-quality goods. Rather, based on corresponding studies, it is assumed that, for example, in so-called supermarkets or similar sales outlets, in which the goods kept in stock are picked up by customers as required (generally in a shopping basket or cart) and then paid for at a cash register, the Loss of goods resulting from theft refers to practically all goods offered and in total amounts to more than 1% of the total turnover. This size is extremely high, not least in view of the relatively small profit margins of such sales outlets, and requires appropriate countermeasures.
  • the procurement costs amount to 6 Pfg. and are therefore in the size of the profit to be achieved.
  • the above example is by no means out of thin air, but is even at the lower end of the cost range for such sensor elements.
  • Other metal sensor elements for use in magnetic anti-theft systems even cost several times more (e.g. approx. DM 0.25) and can therefore be used for economic reasons at best for very high-quality goods with a corresponding value.
  • the sensor metal elements to be secured to an object to be secured each consist of a metal strip which consists of a highly permeable metal or a corresponding metal alloy with a pronounced rectangular hysteresis loop.
  • the metal strips forming the sensor elements must be attached to an object to be secured with a separate security label, because the price tags usually used for labeling are too small to be able to be provided with such a metal strip.
  • a length of, for example, 7 cm is required for the sensor metal elements of common systems in order to be able to generate the desired signals at all.
  • an object provided with a magnetically activated metal sensor element is brought to a room outlet, in a supermarket or the like, for example a control gate arranged adjacent to a cash register, to which a magnetic device is attached by means of a corresponding device (Alternating) field is generated, so that in a corresponding device, which essentially consists of an induction coil, due to the non-linear hysteresis loop of the material of the sensor metal element, among others Harmonics are induced, which can be evaluated by means of a suitable electronic filter device, so that an acoustic or / and visual alarm is triggered when corresponding harmonics occur (if necessary, the room outlet can also be closed, for example) if an appropriately secured object is unauthorized is removed from the room in question.
  • a corresponding device which essentially consists of an induction coil
  • Harmonics are induced, which can be evaluated by means of a suitable electronic filter device, so that an acoustic or / and visual alarm is triggered when corresponding harmonics
  • an appropriately secured object is properly paid for and then only passed through a suitably equipped room outlet, its magnetization is deactivated during or after the payment so that no harmonics occur when passing through the room outlet, which are a signal for an unauthorized removal of a secured object deliver.
  • the establishment of such a known anti-theft system consists of an excitation coil which generates the electromagnetic alternating field, in addition to the strip-shaped sensor metal elements already mentioned repeatedly, the induction coil forming the pick-up coil and the filter electronics.
  • This drives the securing strip, which is made of a soft magnetic metal, to saturation and then generates magnetic reversal processes in it due to the alternating field, which are detected with the induction coil.
  • the fundamental frequency is then expediently suppressed by means of the filter electronics and only the harmonics (generally between the second and twentieth harmonics, often reaching into the 100 kHz range) are evaluated, it being important that these harmonics are already at relative small excitation field strengths are excited with which the previously known systems work, but that these harmonics to be generated and evaluated nevertheless stand out as possible from signals that are not generated by sensor metal elements but by objects that the customer may have with them or else has duly declared and paid for as a purchase.
  • the magnetic material of such a security strip serving as a sensor metal element must be both extremely permeable and distinctly rectangular with respect to its hysteresis loop.
  • a combination of a magnetically active strip with a magnetically semi-hard material enables the security function of a sensor metal element to function if an appropriately secured article is taken with authorization to put.
  • the semi-hard part of the metal strip is deliberately magnetized by an external field and in this way linearizes the characteristic of the magnetically active strip or part of the strip, as a result of which the harmonics that provide the signal desired for unauthorized driving are reduced in amplitude to such an extent that they are no longer recognized as harmonics by the filter electronics and no longer trigger an alarm signal.
  • the request is not uncommon in this regard, and a false alarm is triggered in spite of the corresponding magnetization by misinterpretation.
  • the object of the present invention is to create a security system of the type described in the introduction which avoids the aforementioned and further disadvantages and which fulfills the requirements to be made both in technical and in economic terms. From a technical point of view, it should therefore be ensured on the one hand that the taking of an object carried illegitimately (at least with a sufficiently high statistical probability) is actually determined, but on the other hand that a false alarm is avoided with a probability bordering on certainty.
  • the necessary investments with regard to the required facilities and in particular also the required sensor metal elements should be able to be reduced considerably with the security system according to the invention, on the one hand by correspondingly low procurement costs and on the other hand by a considerable reduction in the installation costs (e.g.
  • a sensor metal element can be attached to an object to be secured with a price tag.
  • the sensor metal elements according to the invention for the security system according to the invention should be recognized or found as badly as possible by potential thieves and should be overridden if they are found.
  • the security system according to the invention should also be able to be used as a burglar security system.
  • Another part of the object on which the present invention is based lies in a new use of a Wiegand wire, which is described in more detail below, as will be described in more detail below.
  • Magnetic field is an alternating field, so that a quasi-stationary signal can be generated in this way, which can be evaluated considerably better than a singular signal.
  • the system is designed in such a way that the signal to be detected by the second device - preferably at least one induction coil of the second device - is a pulse which, for reasons which will be explained in more detail below, is preferably asymmetrical.
  • a most preferred embodiment of a sensor metal element according to the invention lies in its configuration as a Wiegand wire, the length of which is preferably (only) about 5 to 20 mm and in particular for direct use in connection with conventional price tags is only about 1 cm, the diameter being approx Can be 0.15 to 0.4 mm and is about 0.25 mm in a most preferred embodiment of the present invention.
  • a Wiegand wire basically consists of two sections with different magnetic properties, the coercive force of one section being significantly above the coercive force of the other section, although the wire has a substantially uniform cross section has chemical composition.
  • a wire made of a ferromagnetic material with a fine grain structure is subjected to a longitudinal tension that is sufficient to conduct it permanently, and then subjected to cyclic torsional stress, after which the longitudinal tension is removed from the wire, this creates a Wiegand wire, in which the sections of different coercive force consist on the one hand of its jacket section and on the other hand of its core section, as described, for example, in DE-PS 21 43 326.
  • the first device becomes Generating a magnetic field preferably generates a periodic alternating magnetic field in a manner known per se, so that quasi-stationary signals are to be generated by means of such an excitation.
  • Such an alternating field can be generated with a frequency generator, the frequency of which in a preferred embodiment of the present invention is in the range from 400 to 800 Hz, the Frequency generator does not have to be in constant operation, but is preferably only to be switched on automatically when a person approaches it, and accordingly is preferably also switched off again automatically when the person moves away from it. This can be achieved by the simplest circuitry measures (e.g. a light barrier).
  • Wiegand wire is a sensor metal element which is particularly suitable in the context of the present invention, both technically Terms as well as from an economic point of view.
  • this is not intended to express the fact that there are no other possible configurations of sensor metal elements suitable for the invention, which offer at least approximately the same advantages in technical and / or economic terms.
  • the so-called impulse wire produced and sold by the company Vacuumschmelze GmbH Hanau-Berlin is an element which can be used very advantageously in the context of the present invention.
  • This so-called impulse wire is a composite wire, in which an internal switching core is held under tension by a milling material.
  • a permanent magnet wire preferably of the same length and approximately the same diameter, is arranged parallel to the composite wire, the usual dimensions of such pulse wires being approximately 0.1 to 0.2 mm in diameter and a length of approximately 10 to 20 mm is sufficient for use as a magnetic sensor.
  • Such pulse wires (without power supply) emit voltage pulses of up to 2 V as a magnetic switching element, wherein only a magnetic field of only approx. 20 A / cm is required for triggering the pulse and the pulse half-width is in the range of approx. 12 ⁇ s.
  • Such pulse wires have so far been used to record magnetic fields and to store information.
  • the device arranged at each room outlet consists of at least one field coil, which among other things. is dimensioned such that its height is approximately 2 m (for example 2.2 m) and its width is approximately 1 m (for example 0.8 m) so that a person can walk through the field coil effortlessly if it is ring-shaped as it were the room outlet surrounds, the lower leg of the field coil in a theft security system is expediently sunk in the floor of the room in question and when using the security system according to the invention as a burglar alarm system on the other legs of the field coil in a wall or the ceiling of the room in question can be let in.
  • leg cross-section of a field coil of about 5 to 15 cm2 with a number of turns of a field coil consisting essentially of copper wire of about 100 to 200 turns is completely sufficient to be manageable with other electrical values and above all a Wiegand -Wire of sufficiently small dimensions to achieve the desired effect.
  • an object provided with a deactivated Deactivated Wiegand wire can be detected if the longitudinal axis of the Wiegand wire essentially with the vector of the exciting magnetic alternating field generated by the field coil agrees, so that with such an arrangement, therefore, more than a third of all random spatial positions of a sensor metal element designed as a Wiegand wire can be recognized and reported with certainty and accordingly a thief who, based on experience, does not only visit a certain sales outlet regularly, statistically every third to second theft is determined.
  • the first device assigned to a room outlet can (at least) have a further second field coil, the central axis of which extends at an angle to the central axis of the first field coil. If the central axes of the first and second field coils are perpendicular to one another, a further good third of all conceivable random positions of the sensor metal element in the form of a Wiegand wire can be seen, and one hundred percent proof can be achieved by a third field coil is also provided, the magnetic vector of which extends perpendicular to the magnetic vector of the first and second field coils.
  • a sensor metal element designed as a Wiegand wire is premagnetized and the ignition field strength does not exceed an upper limit value, which for example does not exceed the value 25 A / cm with an intended ignition field strength of 16 A / cm, this is from an active sensor metal element
  • the pulse image generated asymmetrically the positive impulse is (significantly) higher than the negative impulse or vice versa.
  • positive and negative impulses in the demagnetized state are the same size. This effect can be used in an excellent manner to deactivate sensor metal elements designed as Wiegand wire in the security system according to the invention, which happens when a correspondingly secured object is legitimately brought through a room outlet after payment.
  • the second device of the security system essentially consists of at least one induction coil with a preferably downstream filter device. It has proven to be particularly useful if an induction coil is arranged on each of two parallel legs of each field coil, the induction coils also expediently being oriented such that they implement changes in the magnetic field, the vector of which is parallel to the central axis of the field coil or to its magnetic vector runs.
  • the induction coils are preferably designed with a low intrinsic capacity without a metal core.
  • the filter device downstream of the coils by means of which signals generated by a sensor metal element are to be filtered out (or other signals are to be filtered out and the signals leading to the triggering of an alarm are to be passed through) can be assigned or assigned a computer which determines the process sequence, the Arrangement can be made so that the computer (for example by means of a light barrier) is to be activated when a person approaches a room outlet, that the computer then controls the frequency generator in order to put it into operation, and that the computer continues to operate at one Receiving signals does not always trigger an alarm if he is informed of any kind of pulse signal (as this may well be the case in the embodiment of the present invention), but that he first checks the probability that it is these signals are actually signals generated by a sensor metal element.
  • the computer for example by means of a light barrier
  • the computer checks the amplitude ratio of the positive and negative pulses in the induction coil / the induction coils due to the field coil / field coils generated alternating magnetic field are generated during the respective magnetization reversal, whereby to further reduce false alarms, an alarm is only triggered when a predetermined amplitude ratio of positive and negative amplitude (or vice versa) is reached or exceeded. If you want to virtually completely exclude false alarms, you can program the computer so that an alarm is only triggered if this amplitude ratio is 2: 1 or 3: 1, for example.
  • the total investment costs for a security system according to the invention are low compared to comparable known systems. This is achieved, inter alia, by the fact that it is readily possible to use only a single computer and also only one frequency generator for all of the room outlets to be secured or secured. Because, for example, in a supermarket, for example, not all customers who are currently at a cash register and therefore in front of a room outlet (control gate) enter the room outlet at the same time, and it is even less likely that several thieves will come together at exactly the same time Pass the room outlet.
  • the computer which can be a single-board computer, supplies the field coil (s) with current from a central frequency generator when a customer approaches the relevant room exit, especially since several room outlets can be seen as it were can be controlled at the same time, since a measuring process only takes a fraction of a second. Accordingly, only at least one field coil and at least one induction coil are required for a room exit to be secured, although it may also be expedient if a separate filter electronics is assigned to each room exit to be secured or secured.
  • 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 (e.g. shelves) by a customer 3 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 in question 2, 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 top 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. This activation state is converted into a deactivated state when the account is properly billed (since the anti-theft 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 in the direction of the control gate 1 in 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 convert magnetic field changes, 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 passes through 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 strengthened 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 certainly also 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 is approximately 25 A / cm in the exemplary embodiment shown.
  • the computer 13 assumes, on the basis of appropriate programming, that the impulses it detects come 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 intended 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 the 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 together with a customary price tag 7 to the goods 2 to be secured, 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 is located, for example, in the vertical direction when passing through the control gate 1, this would not induce a sufficiently strong pulse in the induction coils 15.
  • 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 an intrusion 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 as early as possible during construction and if the objects to be secured are each provided with a Wiegand wire (in the most invisible place 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 outside through a room outlet, since it then triggers a Wiegand pulse in at least one induction coil when the field coil is activated, which pulse, after detection, triggers an alarm.
  • 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 illegitimate burglars, since the frequency generator that is preferably to be provided is located somewhere hidden in a house, an 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
  • goods (objects to be secured) 3 customers
  • cash register 5
  • conveyor belt 6
  • cashier 6
  • Price tag security label
  • field coil 10
  • field coil 11 round
  • light barrier 13
  • computers 14
  • frequency generator 15
  • induction coils 16
  • filter electronics 20 flashing light 21 bugle

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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)
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
DE19873741780 DE3741780A1 (de) 1987-12-10 1987-12-10 Magnetisches diebstahl- bzw. einbruch-sicherungssystem sowie hierfuer geeignetes sensor-metallelement
DE3741780 1987-12-10

Publications (3)

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

Cited By (2)

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US5459451A (en) * 1993-03-12 1995-10-17 Esselte Meto International Gmbh Electronic article surveillance system with enhanced geometric arrangement
WO2010136316A2 (fr) * 2009-05-26 2010-12-02 Commissariat à l'énergie atomique et aux énergies alternatives Procede de detection et detecteur de perturbateur, procede et systeme de localisation utilisant ce procede

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US5204526A (en) * 1988-02-08 1993-04-20 Fuji Electric Co., Ltd. Magnetic marker and reading and identifying apparatus therefor
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.
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DE3741780C2 (fr) 1990-05-23
DE3741780A1 (de) 1989-06-29
JPH01169600A (ja) 1989-07-04
ATE122489T1 (de) 1995-05-15
EP0319637B1 (fr) 1995-05-10
ES2074423T3 (es) 1995-09-16
DE3853767D1 (de) 1995-06-14
EP0319637A3 (fr) 1991-07-03
US5008649A (en) 1991-04-16

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