EP0726549A2 - Dispositif de détection d'un article pourvu d'un élément de sécurité éléctronique - Google Patents

Dispositif de détection d'un article pourvu d'un élément de sécurité éléctronique Download PDF

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Publication number
EP0726549A2
EP0726549A2 EP96100686A EP96100686A EP0726549A2 EP 0726549 A2 EP0726549 A2 EP 0726549A2 EP 96100686 A EP96100686 A EP 96100686A EP 96100686 A EP96100686 A EP 96100686A EP 0726549 A2 EP0726549 A2 EP 0726549A2
Authority
EP
European Patent Office
Prior art keywords
turns
receiving device
detector gate
groups
detector
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
EP96100686A
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German (de)
English (en)
Other versions
EP0726549B1 (fr
EP0726549A3 (fr
Inventor
Jürgen Schoon
Michael David Crossfield
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meto International GmbH
Original Assignee
Esselte Meto International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Esselte Meto International GmbH filed Critical Esselte Meto International GmbH
Publication of EP0726549A2 publication Critical patent/EP0726549A2/fr
Publication of EP0726549A3 publication Critical patent/EP0726549A3/fr
Application granted granted Critical
Publication of EP0726549B1 publication Critical patent/EP0726549B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—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 device for detecting an article provided with an electronic security element in a surveillance zone, comprising at least one transmitting device that emits an alternating magnetic field that excites the electronic securing element to emit a characteristic signal, and at least one receiving device that is used for reception of the characteristic signal triggers an alarm.
  • Electronic goods security devices are now widely used in department stores and warehouses. By installing such facilities, inventory losses caused by theft can be significantly reduced. Such facilities are usually found in the entrance and exit areas of department stores and warehouses to indicate the unauthorized removal of electronically secured goods from the sales or storage area.
  • One of the factors that decisively determine the detection rate of an electronically secured article is the width of the zone to be monitored.
  • a spatially compact arrangement of detector gates in the entrance and exit area disturbs the visual impression that the customer gains when entering the department store: it suggests confinement and confinement. This makes the entrance area uninviting for customers. This impression is reinforced if the detector gates are not transparent.
  • the closely spaced detector gates prevent through traffic in the entrance and exit areas.
  • the invention is based on the object of proposing a device which ensures a sufficiently high detection rate within a wide monitoring zone. Furthermore, the invention provides a solution to the problem. reduce the impression of narrowness in the surveillance zone.
  • the invention manages to provide a solution for fulfilling the two contrary requirements: to provide a wider monitoring zone and a sufficiently high detection rate.
  • the transmitting device has a coil with a plurality of turns, that the turns lie essentially in one plane and that the turns are divided into at least two groups, the (two) groups being arranged at a certain distance from one another.
  • the field strength of the magnetic field in the monitoring zone can be increased considerably without the energy consumption increasing with respect to a corresponding device which does not show the spatial separation of the groups of turns. Viewed from the other side, this means that the width of the zone that can be safely monitored by the device according to the invention can be selected to be larger than that which could previously be safely monitored by a device of the prior art.
  • the reduction in the inductance of the coil goes hand in hand with an increase in the quality Q of the coil, which in particular reduces the losses in the high-frequency range.
  • the device according to the invention brings about a significant reduction in the inductance with respect to the previously known and used crowded arrangement of the individual turns. It is therefore possible to increase the number of turns of the coil of the transmitting device - and thus the field strength within the monitoring zone - without increasing the load resistance with respect to the solution known hitherto.
  • the use of stranded wire instead of the otherwise usual cables with a single metal wire has proven to be particularly advantageous.
  • stranded wire which is composed of a wire mesh consisting of a large number of thin wires, the skin effect is hardly noticeable, while this effect leads to a strong increase in resistance at high frequencies in the case of conventional wire.
  • a further development of the device according to the invention provides that the windings are arranged in a plane lying perpendicular to the direction of passage through the monitoring zone.
  • the windings of the coil can therefore be arranged so that they lie next to one another when the detector gate is viewed from above.
  • the outer windings, in particular the windings of the outer group thus have larger dimensions than the inner windings, or the windings of the inner group. This arrangement undoubtedly has the enormous advantage that the width of the detector gates can be chosen to be very small.
  • the second possibility is to arrange the turns in such a way that they lie one behind the other when the detector gate is viewed from above. Although this arrangement requires wider detector gates; to compensate for this, however, it offers the advantage that the turns of both or all groups have the maximum possible extent for a given size of the detector gate.
  • spacers are provided which spatially separate the (two) groups of turns from one another and keep them at a constant distance.
  • An alternative solution proposes the following to increase the stability of the detector gate: when the windings of the transmitter device are fastened, a groove formed by webs arranged on both sides is provided instead of the spacers at least in the two side regions of the detector gate. After assembly, a rod made of hard material is inserted into this groove.
  • the device according to the invention in such a way that the transmitting device and at least one receiving device are arranged in a detector gate forming a unit.
  • the transmitting device and at least one receiving device are arranged in a detector gate forming a unit.
  • the transmitting device and at least one receiving device are arranged in a detector gate forming a unit.
  • the transmitting device and at least one receiving device are arranged in a detector gate forming a unit.
  • the transmitting device and at least one receiving device are arranged in a detector gate forming a unit.
  • the transmitting device and at least one receiving device are arranged in a detector gate forming a unit.
  • the detector gate consists of an outer part and an inner part, the transmitter device being preferably accommodated in the outer part and the receiving device (s) in the inner part of the detector gate .
  • the detector gate is provided to design the detector gate with an open front and rear side, which suits him gives a modern, open design that is aesthetically extremely appealing.
  • this configuration also provides technical advantages: the material consumption for the receiving device (s) can be considerably reduced due to its small surface area.
  • a universal gate assembly for use in electronic article surveillance has become known from EP 0 428 384 B1.
  • the detector gate consists of an underframe that can be anchored to the floor, an upper section with side sections that run parallel to one another, and a middle section that is rigidly connected to the underframe and an upper section. Furthermore, means for connecting the two housing halves are provided in predetermined positions.
  • the turns of the transmitter and receiver coils run above the base. While the turns of the transmitter device run in the edge regions of the upper section, the turns of the receiver coils can be found in the middle part of the detector gate.
  • the constructive composition of the detector gate according to the invention differs decisively from this known construction.
  • the detector gate consists of two half-shells, preferably produced by injection molding.
  • the half-shells form a peripheral frame with a central part that divides the area specified by the frame into two halves.
  • the turns of the transmitting device are arranged in the frame of the detector gate; the maximum available area of the detector gate is thus approximately used for the transmitting device.
  • the receiver coils are preferably to be found in the middle part of the detector gate.
  • the new constructive composition of the detector gate is not limited to the division of the turns of the transmitter coil into two groups according to the invention, but can generally be used for any detector gates.
  • the receiving device is advantageously designed such that it has at least one receiver coil.
  • the receiver coil is advantageously wound in such a way that it has multiple poles; it preferably has a quadrupole characteristic.
  • the individual receiver coils are matched to one another in such a way that the detection rate is sufficiently high in all areas of the monitoring zone.
  • a receiver coil shaped as an 'eight' has a zero detection rate on a line that passes through the intersection between the upper and lower loops of the 'eight' and is parallel to the upper and lower edges of the detector gate. If another 'quadrupole offset eight' is superimposed on this receiver coil, so that the middle area of one of the two loops of the 'quadrupole offset eight' is superimposed on the area in which the two loops of the first 'eight' intersect ensures that the detection rate of the receiver coils is never zero at any point.
  • the device according to the invention can be used for all possible configurations of securing elements.
  • the electronic securing element can be an element that is made of a material with high permeability and low coercive force (soft magnetic material).
  • the device according to the invention detects security elements which are made of a material with magnetostrictive properties. The same applies in principle to fuse elements that have a resonant circuit. Securing elements with the previously described Properties have become known, for example, from the following European patent specifications: EP 0 295 028 B1, EP 0 181 327 B1 and EP 0 093 281 B1.
  • the device 1 schematically shows the device 1 according to the invention for detecting an article provided with a securing element 2 in a monitoring zone 3.
  • the monitoring zone 3 is formed by two detector gates 4, which are arranged in parallel and which contain the transmitting device 5 and the receiving device 6.
  • the transmission device 5 is supplied with computer control from the energy supply 7 in such a way that it emits an alternating magnetic field (several alternating magnetic fields) with the desired frequency (s) into the monitoring zone 3.
  • the frequency (s) is (are) matched to the particular nature of the securing element 2 used. Since the detection rate i.a.
  • the characteristic signal is at a maximum if the magnetic field and the alignment of the securing element 2 are parallel to one another, and it is zero with a vertical alignment - the field strength of the Magnetic field are selected so that the securing element 2 emits a sufficiently strong characteristic signal in the intermediate layers, which signal can be detected by the receiving device 6.
  • a special method for detecting a security element 2 in the monitoring zone 3 has become known, for example, from EP 0 153 286 B1. The content of this European patent specification is to be expressly added to the disclosure content of the present invention.
  • This computing / control device 8 evaluates the signals of the receiving device (s) and, upon detection of a characteristic signal, causes an alarm device 9 to emit an alarm.
  • the detector gate 4 consists of two partial areas: an outer, frame-like part 10 and an inner part 11, which is arranged between the lower and upper part of the frame.
  • the transmitting device 5 is arranged in the outer part 10 and the receiving device 6 is arranged in the inner part 11.
  • Both the outer part 10 and the inner part 11 consist of two shell-shaped frame halves 23, 24 which can be joined together and which serve to accommodate the transmitting device 5 and the receiving device (s) 6.
  • Holding elements 17 are attached to the two lateral regions of the outer part 10.
  • the holding elements 17 are fixed by means of the floor brackets 22, which for example consist of a bolt anchored in the floor and a nut.
  • the transmitting device 5 consists of eighteen turns 12, which according to the invention are divided into two groups 13a, 13b of turns 12. In the case shown, each of the two groups 13a, 13b has the same number of turns 12. In general, however, the subdivision of the turns 12 into groups 13a, 13b is possible in any constellation.
  • the gap 15 between the two groups 13a, 13b of turns 12 is created by spacers 14, which are arranged at a defined distance from one another along the coil turns 12.
  • the spacers 14 each have a bore 28 in the area of the gap 15 created by them, which serves to receive a screw 29. These screws 29 also have the function of connecting the two frame halves 23, 24 to one another.
  • the turns 12 are arranged side by side when viewed from above on the front or the back of the detector gate 4.
  • the transmission device 5 according to the invention operates also excellent if the windings 12 are arranged one behind the other - in the direction of view of the front or rear of the detector gate 4.
  • the subdivision of the turns 12 and the gap 15 lying between the groups 13a, 13b makes the inductance of the transmitting device 5 embodying coil significantly reduced.
  • the gap 15 between the two groups 13a, 13b makes it possible to increase the number of turns 12 and thus the field strength in the monitoring zone 3 without having to accept additional power losses.
  • the transmission device 5 is powered by the power supply 7 in a computer-controlled manner in such a way that an alternating magnetic field with the desired frequencies is emitted into the monitoring zone 3.
  • these frequencies are, for example, a low frequency in the hertz range and two high frequencies in the kilohertz range.
  • the computing / control device 8 is accommodated in the case shown in the form of a computer card in the lower part of the detector gate 4 and is freely accessible from the outside after opening the flap 16.
  • the lower part of the detector gate 4 is designed such that it leaves a space between the outer group 13a of the turns 12 and the ground. In this free space 30 there is sufficient space for line cables which are placed on the detector gate 4 from the outside.
  • the flap 16 is closed, there is sufficient space between the groups 13a, 13b of windings 12 and the flap 16 itself, so that the line cables coming from outside can be routed to the computing / control device 8, here a computer card, without any problems.
  • the concealed routing of the cable rounds off the harmonious overall impression of the detector gate 4.
  • the receiving device 6 is arranged in the inner part 11 of the detector gate 4.
  • the receiving device 6 consists of three combined receiver coils 18, 19, 20.
  • the receiver coil 18 consists of two horizontally adjacent loops 21 which are connected in series, so that the windings flow through them in opposite directions. While the receiver coil 18 thus embodies a horizontally lying "figure eight", the receiver coil 19 consists of a vertical “figure eight”, and the receiver coil 20 is effectively composed of two "figure eight", a so-called offset figure eight, one below the other.
  • the shapes of the selected receiver coils 18, 19, 20 ensure, especially in combination, a sufficient detection rate for an electronic security element 2 in the entire area of the monitoring zone 3. All three receiver coils only couple to a small extent with each other or with the transmitter. Furthermore, as already described above, they are distinguished by the fact that they are relatively insensitive to far fields that come from outside the surveillance zone.
  • Pins 33 are arranged in the region of the inner part 10. These pins 33 serve the purpose of fixing the windings 12 of the receiver coils 18, 19, 20 in the desired positions.
  • the shape of the receiver coils 18, 19, 20 is chosen such that they have the sensitivity of quadrupole fields. This constellation achieves sufficient sensitivity of the receiving device 6 in the central region of the detector gate 4 even with small dimensions. In addition, interference signals from far fields can be switched off to a sufficiently high degree so that the detection rate is optimal for the security elements passing through the monitoring zone.
  • the receiving device 6 receives a signal which the computing / control device 8 subsequently recognizes as a characteristic signal emitted by a security element 2, it sends a pulse to the alarm device 9, which is then acoustically via the two buzzer 25 and / or optically by means of the Flashing light 26 indicates the unauthorized stay of an electronically secured article in the surveillance zone 3.
  • the alarm device 9 is clearly visible in FIG. 3, which shows a top view of the detector gate 4 from above. Furthermore, the recess between the two shell-shaped frame halves 23, 24 can be seen in FIG. 3. It is sealed by a so-called piping 27, an elastic closure.
  • the holding elements 17 attached in the lower region of the outer part 10 of the detector gate 4 are by means of the Floor brackets 22 anchored in the floor.
  • the adjusting screws 37 are used for fine alignment of the detector gate 4.
  • FIGS. 4 to 12 show the sections marked with corresponding Roman numerals in FIG. 2.
  • FIG. 4 shows a section through an upper corner of the outer part 10 of the detector gate 4.
  • the webs 31 attached to the inner sides of the two frame halves 23, 24 serve to create a lateral boundary for the windings 12 of the inner group 13b. Otherwise, they contribute to the stability of the outer part 10 of the two frame halves 23, 24.
  • the two frame halves are screwed together by means of screws 29 which are guided through bores 28.
  • the two frame halves 23, 24 have bores 28 for receiving the screws 29.
  • the bores 28 and the screws 29 are arranged in the region of the gap 15 between the two groups 13a, 13b of windings 12. Furthermore, some of the screws 29 fix the spacers 14 in the desired positions.
  • These spacers 14 are elements made of plastic, which in the area of the gap 15 has an area penetrated by the bore 28 and which has a slot in the area of the outer group 13a of turns 12 for receiving the turns 12.
  • the recess at the edge of the outer part 10 left free by the two frame halves 23, 24 is sealed by an elastic closure element, a so-called piping 27.
  • FIG. 6 shows a cross section through the outer part 10 of the detector gate 4 in the region of the lateral holding elements 17. 7 relates to a parallel section in the area of a spacer 14.
  • FIG. 8 shows a section through the bottom part of the outer part 10 of the detector gate 4.
  • the free space 30 for receiving the lines can be seen in this FIG.
  • FIG. 9 shows a section through the inner part 11 of the detector gate 4 in accordance with the identification IX-IX in FIG. 2.
  • the arrangement of the turns 12 of the receiver coils 18, 19 are shown in this figure. 20 can be seen.
  • the individual turns 12 are guided in clamping elements 35.
  • FIG 10 shows a cross section through the area that contains the acoustic part of the alarm device 9.
  • the two buzzer 25 are shown in this drawing.
  • a (one or two) flashing light (s) 26 is / are arranged in a housing which is covered by a transparent, colored cap 34, which, in combination with the two buzzer 25, cannot be overlooked or not Sending out alarm signals as soon as the computing / control device 8 makes out the characteristic signal of a security element 2 in the monitoring zone 3.
  • FIG. 12 shows the section according to the identification XII-XII in FIG. 2 in the area of one of the six alignment means 32, which can be found in the inner part 11 of the detector gate 4.
  • these alignment means 32 are elements which are intended to facilitate the joining together of the two frame halves 23, 24 after installation of the receiving device (s) 6.
  • the alignment means 32 are two elements which can be inserted into one another with a precise fit, one of these elements being attached to the inside of the front frame half 23 and the other element to the inside of the rear frame half 24.
  • FIG. 13 shows a further embodiment of the device according to the invention. It differs from the previously described embodiment only in the manner in which the windings 12 of the transmitter device 5 are fastened. In the lower and upper region of the frame, the fastening continues to be carried out by means of the spacers 14. In the lateral regions these are by two between the two groups 13a, 13b of turns 12 webs 38, 39 replaced. With this construction, a considerably higher stability of the detector gate 4 against external influences is achieved. The stability of the detector gate 4 can be optimized by inserting a rod 40 made of a hard material into the free space between the two webs 38, 39.
  • FIGS. 14, 15 and 16 show the sections identified in FIG. 13 . All further details of the embodiment of FIGS. 13, 14, 15 and 16 correspond to the details shown in the previous figures.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
EP96100686A 1995-02-07 1996-01-18 Dispositif de détection d'un article pourvu d'un élément de sécurité éléctronique Expired - Lifetime EP0726549B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19503896 1995-02-07
DE19503896A DE19503896A1 (de) 1995-02-07 1995-02-07 Einrichtung zur Detektierung eines mit einem elektronischen Sicherungselement versehenen Artikels

Publications (3)

Publication Number Publication Date
EP0726549A2 true EP0726549A2 (fr) 1996-08-14
EP0726549A3 EP0726549A3 (fr) 1996-11-06
EP0726549B1 EP0726549B1 (fr) 2000-05-03

Family

ID=7753312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100686A Expired - Lifetime EP0726549B1 (fr) 1995-02-07 1996-01-18 Dispositif de détection d'un article pourvu d'un élément de sécurité éléctronique

Country Status (5)

Country Link
EP (1) EP0726549B1 (fr)
AU (1) AU695927B2 (fr)
DE (2) DE19503896A1 (fr)
DK (1) DK0726549T3 (fr)
ES (1) ES2148599T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19722078A1 (de) * 1997-05-27 1998-12-03 Meto International Gmbh System zur Überwachung von elektromagnetisch gesicherten Artikeln in mehreren Überwachungszonen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19726986A1 (de) * 1997-06-25 1999-01-07 Meto International Gmbh Vorrichtung zur Überwachung von elektronischen gesicherten Artikeln in einer Überwachungszone
DE19732558A1 (de) * 1997-07-29 1999-02-04 Meto International Gmbh Verfahren und Vorrichtung zur Wicklung einer Sende- oder Empfangsspule für ein elektronisches Artikelüberwachungssystem
DE19858714A1 (de) 1998-12-18 2000-06-21 Ebinger Klaus Ing Fa Torsonde

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3820104A (en) * 1972-12-15 1974-06-25 Stop Loss Inc Method and system for detecting an object within a magnetic field interrogation zone
DE2628644A1 (de) * 1975-06-27 1977-02-24 Knogo Corp Mit elektromagnetischem nahfeldbereich arbeitende detektorschranke fuer gegenstaende
EP0428384A2 (fr) * 1989-11-15 1991-05-22 Minnesota Mining And Manufacturing Company Réseau universel pour système magnétique-électronique de surveillance d'articles
WO1993011516A1 (fr) * 1991-12-04 1993-06-10 Esselte Meto International Gmbh Procede et systeme de surveillance et de detection utilisant des marqueurs magnetiques

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US4118693A (en) * 1977-05-09 1978-10-03 Knogo Corporation Method and apparatus for producing uniform electromagnetic fields in an article detection system
US4260990A (en) * 1979-11-08 1981-04-07 Lichtblau G J Asymmetrical antennas for use in electronic security systems
US4623877A (en) * 1983-06-30 1986-11-18 Knogo Corporation Method and apparatus for detection of targets in an interrogation zone
US4509039A (en) * 1983-07-05 1985-04-02 Minnesota Mining And Manufacturing Company Shielded, closely spaced transmit-receiver antennas for electronic article surveillance system
GB8808933D0 (en) * 1988-04-15 1988-05-18 Scient Generics Ltd Antipilferage system
US5051726A (en) * 1990-08-14 1991-09-24 Sensormatic Electronics Corporation Electronic article surveillance system with antenna array for enhanced field falloff
NL9100397A (nl) * 1991-03-06 1992-10-01 Nedap Nv Asymmetrische antenne voor winkeldiefstaldetectiesystemen.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3820104A (en) * 1972-12-15 1974-06-25 Stop Loss Inc Method and system for detecting an object within a magnetic field interrogation zone
DE2628644A1 (de) * 1975-06-27 1977-02-24 Knogo Corp Mit elektromagnetischem nahfeldbereich arbeitende detektorschranke fuer gegenstaende
EP0428384A2 (fr) * 1989-11-15 1991-05-22 Minnesota Mining And Manufacturing Company Réseau universel pour système magnétique-électronique de surveillance d'articles
WO1993011516A1 (fr) * 1991-12-04 1993-06-10 Esselte Meto International Gmbh Procede et systeme de surveillance et de detection utilisant des marqueurs magnetiques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19722078A1 (de) * 1997-05-27 1998-12-03 Meto International Gmbh System zur Überwachung von elektromagnetisch gesicherten Artikeln in mehreren Überwachungszonen

Also Published As

Publication number Publication date
EP0726549B1 (fr) 2000-05-03
DE19503896A1 (de) 1996-08-08
EP0726549A3 (fr) 1996-11-06
ES2148599T3 (es) 2000-10-16
DE59605082D1 (de) 2000-06-08
AU4058295A (en) 1996-08-15
AU695927B2 (en) 1998-08-27
DK0726549T3 (da) 2000-09-04

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