EP0726549B1 - Detection device for an article with an electronic securing element - Google Patents

Detection device for an article with an electronic securing element Download PDF

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Publication number
EP0726549B1
EP0726549B1 EP96100686A EP96100686A EP0726549B1 EP 0726549 B1 EP0726549 B1 EP 0726549B1 EP 96100686 A EP96100686 A EP 96100686A EP 96100686 A EP96100686 A EP 96100686A EP 0726549 B1 EP0726549 B1 EP 0726549B1
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EP
European Patent Office
Prior art keywords
turns
groups
transmit
detector
receive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96100686A
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German (de)
French (fr)
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EP0726549A2 (en
EP0726549A3 (en
Inventor
Jürgen Schoon
Michael David Crossfield
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Meto International GmbH
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Meto International GmbH
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Publication date
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Publication of EP0726549A2 publication Critical patent/EP0726549A2/en
Publication of EP0726549A3 publication Critical patent/EP0726549A3/en
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Publication of EP0726549B1 publication Critical patent/EP0726549B1/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—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 a electronic security element provided article in a surveillance zone with at least one transmitter device that emits an alternating magnetic field, that the electronic security element for sending a characteristic Signal excites, and with at least one receiving device that is receiving of the characteristic signal triggers an alarm.
  • Such a device is known from DE-A-2 628 644, which also discloses that the transmitting device has a coil with several turns.
  • Devices for the purpose of electronic article surveillance are now in Department stores and warehouses widely used. By installing such Equipment, inventory losses caused by theft can be reduce significantly. Such devices are usually in the Exit area of department stores and warehouses to find the illicit Remove electronically secured goods from the sales or storage area display.
  • 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 has for its object to propose a device sufficiently high detection rate within a wide surveillance zone ensures. Furthermore, the invention provides a solution to the problem. the impression mine from narrowness in the surveillance zone.
  • the invention creates a Solution to meet the two conflicting requirements: wider Surveillance zone and sufficiently high detection rate.
  • the transmitter device be a coil with several turns has that the turns are substantially in one plane and that the Windings are divided into at least two groups, the two groups are arranged at a certain distance from each other.
  • 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 subdivision of the turns and thus the inductance of the coil is considerably reduced by the inventive division of the turns of the transmitting device into at least two groups, the two groups being at a certain distance from one another.
  • 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 a significant reduction in Inductance with respect to the previously known and used crowded Arrangement of the individual turns. It is therefore possible to limit the number of Windings of the coil of the transmitter device - and thus the field strength within the surveillance zone - to increase without the load resistance with respect to the previously known solution would increase.
  • the device according to the invention the use of stranded wire instead of otherwise proven cables with a single metal wire.
  • stranded wire the a wire mesh consisting of a multitude of thin wires, composed, the skin effect is hardly noticeable during this effect with conventional wire to a strong increase in resistance at high Frequencies.
  • a further development of the device according to the invention provides that the Turns in a direction perpendicular to the direction of passage through the Surveillance zone lying level are arranged.
  • the turns of the coil can therefore be arranged so that they are in a top view of the Detector gates lie side by side. So that the outside have Turns, especially the turns of the outer group, larger Dimensions as the inner turns, or the turns of the inner Group. This arrangement undoubtedly has the enormous advantage that the width of the Detector gate can be chosen very low.
  • the second possibility is to arrange the turns so that they are at Top view of the detector gate lying one behind the other.
  • This arrangement requires wider detector gates; in return, it offers the advantage that the Turns of both or all groups the maximum possible expansion in one have a predetermined 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.
  • a particularly advantageous embodiment of the device according to the invention suggests that in the case of the integral solution, the detector gate from one outer part and an inner part, wherein the transmitting device in the outer part and the receiving device (s) preferably in the inner part of the detector gate are housed.
  • the transmitting device in the outer part and the receiving device (s) preferably in the inner part of the detector gate are housed.
  • Detector gates with openwork front and back to shape what suits him gives a modern, open design that is aesthetically extremely appealing This Design also provides technical advantages: the material consumption for the Receiving device (s) can be due to their small surface area reduce considerably.
  • EP 0 428 384 B1 uses a universal gate assembly become known in electronic article surveillance.
  • the detector gate sets consists of a base that can be anchored to the floor, an upper section with parallel side sections and with a central part together, the are rigidly connected to the base and an upper part. Furthermore, funds are for connecting the two housing halves in predetermined positions intended.
  • the turns of the transmitting and receiving coils run above the base while the windings of the transmitter in the Edge areas of the upper section run, are the turns of the Find receiver coils in the middle part of the detector gate.
  • the constructive composition of the detector gate gives way from this known construction decisively.
  • the detector gate consists of two - half shells - preferably manufactured by injection molding.
  • the half-shells form a circumferential frame with a central part that the divides the area specified by the frame into two halves.
  • the turns of the Transmitting devices are arranged in the frame of the detector gate; for the Transmitting device is therefore approximately the maximum available Utilized surface of the detector gate.
  • the receiver coils preferably found in the middle part of the detector gate. It goes without saying the new design composition of the detector gate does not affect the division of the turns of the transmitter coil into two groups limited, but generally usable for arbitrarily equipped detector gates.
  • the receiving device is advantageously designed such that it has at least one receiver coil.
  • the receiver coil is advantageous so wound that it has multiple poles; preferably it has one Quadrupole characteristic.
  • the individual receiver coils are coordinated so that the Detection rate in all areas of the surveillance zone is sufficiently high.
  • a receiver coil shaped as an 'eight' has a zero detection rate on a line through the intersection between the upper and lower loops of the 'Eight' runs and is parallel to the upper or lower edge of the detector gate. If a further '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' Area where the two loops of the first 'eight' intersect, it is ensured that the detection rate of the receiver coils is nowhere is zero.
  • the device according to the invention is for all possible forms of Fuse elements can be used. So it can be with the electronic Securing element is an element that is made of a material with high Permeability and low coercive force (soft magnetic material) is made. Furthermore, the device according to the invention provides security elements detected, which are made of a material with magnetostrictive properties. The same applies in principle to fuse elements that have a resonant circuit exhibit. Securing elements with the previously described Properties are, for example, from the following European patents become known: EP 0 295 028 B1, EP 0 181 327 B1 and EP 0 093 281 B1.
  • the monitoring zone 3 is made up of two detector gates 4 placed in parallel formed, which contain the transmitting device 5 and the receiving device 6.
  • the transmission device 5 is computer-controlled by the energy supply 7 in this way energized that they have an alternating magnetic field (several magnetic Alternating fields) with the desired frequency (s) into the monitoring zone 3 sends out.
  • the frequency (s) is (are) based on the particular nature of the used fuse element 2 matched. Since the detection rate i.a.
  • the characteristic signal is maximum if that Magnetic field and the alignment of the securing element 2 parallel to each other stand, and it is zero with vertical alignment -, must also the Field strength of the magnetic field can be selected so that the securing element 2 A sufficiently strong characteristic signal even in the intermediate layers transmits, which can be detected by the receiving device 6.
  • a special one Method for detecting a security element 2 in the monitoring zone 3 has become known, for example, from EP 0 153 286 B1.
  • This computing / control device 8 evaluates the Signals of the receiving device (s) and causes a characteristic signal an alarm device 9 for emitting an alarm.
  • FIG. 2 shows a preferred embodiment of the device 1 according to the invention shown in partial section.
  • the detector gate 4 is - roughly speaking - from two sections: an outer, frame-like part 10 and an inner Part 11, which is arranged between the lower and upper part of the frame.
  • the outer part 10 is the transmitter 5 and in the inner part 11 is the Receiving device 6 arranged.
  • Both the outer part 10 and the inner part Part 11 consist of two joinable, shell-shaped frame halves 23, 24 for receiving the transmitting device 5 and the receiving device (s) 6 serve.
  • On the two lateral areas of the outer part 10 are Holding elements 17 attached.
  • the floor brackets 22 for example consist of a bolt anchored in the ground and a nut, the Holding elements 17 fixed.
  • 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 closed Spacers 14 created that are longitudinally spaced apart from each other the coil turns 12 are arranged.
  • the spacers 14 have in the area
  • the gap 15 created by them each has a bore 28 which is for receiving a screw 29 is used. These screws 29 also have the function of to connect the two frame halves 23, 24 to one another.
  • the turns 12 are a top view of the front or the Rear of the detector gate 4 arranged side by side.
  • the transmitting device 5 operates also excellent if the turns 12 - in the direction of view of the front or Rear of the detector gate 4 - are arranged one behind the other.
  • the inductance of the transmitting device 5 embodying coil significantly reduced.
  • the transmission device 5 is computer-controlled by the energy supply 7 in this way energized that an alternating magnetic field with the desired frequencies in surveillance zone 3 is transmitted. These frequencies are - Following EP 0 153 286 B1 - for example around a low frequency in the Hertz range and two radio frequencies in the kilohertz range.
  • the computing / control device 8 is in the form of a computer card housed in the lower part of the detector gate 4 and from the outside after opening the Flap 16 freely accessible.
  • the lower part of the detector gate 4 is such designed to have a space between the outer group 13a Turns 12 and the bottom. There is sufficient space in this free space 30 for cables that 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 turns 12 and the flap 16 itself, so that the of outside cable easily to the computing / control device 8, here a computer card, can be performed.
  • the undercover leadership of the Cable rounds off the overall harmonic impression of the detector gate 4.
  • the receiving device 6 is - as already mentioned - in the inner part 11 of the Detector gate 4 arranged.
  • the receiving device 6 exists according to one particularly favorable embodiment of three combined with each other Receiver coils 18, 19.20.
  • the receiver coil 18 consists of two horizontally adjacent loops 21 which are connected in series, so that the The current flows through windings in opposite directions. So while the receiver coil 18 embodies a horizontal "figure eight", the receiver coil 19 consists of a vertical "eight”, and the Receiver coil 20 is effectively composed of two "eighties" lying one below the other, a so-called offset eight, together.
  • the shapes of the selected receiver coils 18, 19, 20, especially in combination, provide a sufficient detection rate for an electronic security element 2 in the entire area of Surveillance zone 3 safe. All three receiver coils couple only slightly Measure with each other or with the transmitter 5. Furthermore, they stand out - how already described in the previous place - in that they are relative are insensitive to far fields from outside the surveillance zone 3 come from.
  • Pins 33 are arranged in the region of the inner part 10. These pins 33 serve the purpose, the turns 12 of the receiver coils 18, 19, 20 in the fix desired positions.
  • the shape of the receiver coils 18, 19, 20 is chosen such that it sensitivity of quadrupole fields. This constellation is sufficient Sensitivity of the receiving device 6 in the central region of the detector gate 4 achieved even with small dimensions. In addition, interference signals switch off from far fields to a sufficient extent so that the Detection rate for the security elements passing the surveillance zone 2 is optimal.
  • 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 area of the outer part 10 of the detector gate 4 are anchored in the floor by means of the floor brackets 22.
  • the adjusting screws 37 are used for fine alignment of the detector gate 4.
  • FIG. 4 to 12 show those in FIG. 2 with corresponding Roman numerals marked cuts.
  • Fig. 4 is a section through an upper corner of the outer part 10 of the detector gate 4 shown.
  • the inside of the two frame halves 23, 24 attached webs 31 serve a lateral To create a limit for the turns 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 23, 24 are secured by means of screws 29 which are passed through bores 28 are screwed together.
  • Fig. 5 shows a cross section through the upper corner of the outer part 10 of the Detector gate 4.
  • the two frame halves 23, 24 have holes 28 for Take up the screws 29.
  • the holes 28 and the screws 29 are in the Area of the gap 15 between the two groups 13a, 13b of turns 12 arranged.
  • some of the screws 29 fix the spacers 14 in the desired positions.
  • These spacers 14 are elements made of plastic, one in the area of the gap 15 through the bore 28 pierced Have area and that in the area of the outer group 13a of turns 12 have a slot for receiving the turns 12.
  • the one of the two Frame halves 23, 24 left recess at the edge of the outer part 10 is sealed by an elastic closure element, a so-called piping 27.
  • 6 is a cross section through the outer part 10 of the detector gate 4 in Area of the lateral holding elements 17 reproduced. 7 relates to a parallel section in the area of a spacer 14.
  • Fig. 8 is a section through the bottom part of the outer part 10 of the Detector gate 4 shown. In addition to those already in the previous Parts described in this drawing is the free space 30 in FIG See the lines.
  • FIG. 9 shows a section through the inner part 11 of the detector gate 4 according to FIG the marking IX-IX in Fig. 2.
  • the receiver coils 18, 19, 20 can be seen.
  • the individual turns 12 are in Clamping elements 35 out.
  • Fig. 10 shows a cross section through the area that the acoustic part of the Alarm device 9 contains. In particular, the two are in this drawing Buzzer 25 shown.
  • FIG. 11 shows a section through the optical part of the alarm device 9.
  • a housing that is covered by a transparent, colored cap 34, is (are) one (or two) flashing light (s) 26 arranged, the (the) in combination with the two buzzer 25 not to be overlooked or not to be overheard Sends out alarm signals as soon as the computing / control device 8 characteristic signal of a security element 2 in the monitoring zone 3 matters.
  • Fig. 12 shows the section according to the identification XII-XII in Fig. 2 in the area one of the six alignment means 32, which in the inner part 11 of the detector gate 4 are to be found.
  • this alignment means 32 it is about this alignment means 32 to elements that join the two Lighten the frame halves 23, 24 after mounting the receiving device (s) 6 should.
  • the alignment means 32 is two elements that fit snugly into one another, one of these elements on the Inside of the front frame half 23 and the other element on the Inside the rear frame half 24 is attached.
  • FIG. 13 shows a further embodiment of the device according to the invention shown. It differs from the previously described embodiment only by the type of attachment of the turns 12 of the transmitter device 5. In the lower and upper area of the frame is still attached about the spacers 14. In the side areas these are separated by two webs 38 running between the two groups 13a, 13b of turns 12, 39 replaced.
  • the stability of the Detector gate 4 reached against external influences. Optimize can the stability of the detector gate 4 by inserting a rod 40 a hard material in the space between the two webs 38, 39.
  • FIGS. 14, 15 and 16 show those identified in FIG. 13 Cuts. All further details of the embodiment of the figures Fig. 13, Fig. 14, 15 and 16 correspond to those shown in the previous figures Details.

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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)

Description

Die Erfindung bezieht sich auf eine Einrichtung zur Detektierung eines mit einem elektronischen Sicherungselement versehenen Artikels in einer Überwachungszone mit mindestens einer Sendevorrichtung, die ein magnetisches Wechselfeld emittiert, das das elektronische Sicherungselement zur Aussendung eines charakteristischen Signals anregt, und mit mindestens einer Empfangsvorrichtung, die beim Empfang des charakteristischen Signals einen Alarm auslöst.The invention relates to a device for detecting a electronic security element provided article in a surveillance zone with at least one transmitter device that emits an alternating magnetic field, that the electronic security element for sending a characteristic Signal excites, and with at least one receiving device that is receiving of the characteristic signal triggers an alarm.

Eine derartige Einrichtung ist aus der DE-A-2 628 644 bekannt, die auch offenbart, daß die Sendevorrichtung eine Spule mit mehreren Windungen aufweist.Such a device is known from DE-A-2 628 644, which also discloses that the transmitting device has a coil with several turns.

Einrichtungen zum Zwecke der elektronischen Warensicherung sind mittlerweile in Kaufhäusern und Lagern weit verbreitet. Durch die Installation derartiger Einrichtungen lassen sich Inventurverluste, die durch Diebstähle bedingt sind, entscheidend vermindern. Üblicherweise sind derartige Einrichtungen im Ein- bzw. Ausgangsbereich von Kaufhäusern und Lagern zu finden, um das unerlaubte Entfernen elektronisch gesicherter Waren aus dem Verkaufs- oder Lagerbereich anzuzeigen.Devices for the purpose of electronic article surveillance are now in Department stores and warehouses widely used. By installing such Equipment, inventory losses caused by theft can be reduce significantly. Such devices are usually in the Exit area of department stores and warehouses to find the illicit Remove electronically secured goods from the sales or storage area display.

Einer der Faktoren, die die Detektionsrate eines elektronisch gesicherten Artikels entscheidend bestimmen, ist die Breite der zu überwachenden Zone. Um einen elektronisch gesicherten Artikel mit einer hohen Detektionsrate in der Überwachungszone aufzuspüren, ist es daher günstig, die sog. Detektorgatter mit möglichst geringem Abstand im Ausgangsbereich eines Kaufhauses oder eines Lagers anzuordnen.
Eine räumlich gedrängte Anordnung von Detektorgattern im Eingangs- und Ausgangsbereich stört jedoch den optischen Eindruck, den der Kunde beim Betreten des Kaufhauses gewinnt: sie suggeriert Enge und Eingesperrtsein. Damit wirkt der Eingangsbereich wenig einladend auf die Kundschaft. Dieser Eindruck wird verstärkt, wenn die Detektorgatter nicht durchsichtig ausgebildet sind. Darüber hinaus wird durch die eng beieinander stehenden Detektorgatter der Durchgangsverkehr im Eingangs- und Ausgangsbereich behindert.One of the factors that decisively determine the detection rate of an electronically secured article is the width of the zone to be monitored. In order to detect an electronically secured article with a high detection rate in the monitoring zone, it is therefore favorable to arrange the so-called detector gates with the smallest possible distance in the exit area of a department store or a warehouse.
However, 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. In addition, the closely spaced detector gates prevent through traffic in the entrance and exit areas.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung vorzuschlagen, die eine ausreichend hohe Detektionsrate innerhalb einer breiten Überwachungszone sicherstellt. Weiterhin gibt die Erfindung eine Lösung für das Problem,. den Eindruck von Enge in der Überwachungszone abzubauen.The invention has for its object to propose a device sufficiently high detection rate within a wide surveillance zone ensures. Furthermore, the invention provides a solution to the problem. the impression mine from narrowness in the surveillance zone.

Bezüglich der zuerst genannten Aufgabenstellung, schafft es die Erfindung, eine Lösung für das Erfüllen der beiden konträren Anforderungen: verbreitere Überwachungszone und ausreichend hohe Detektionsrate zu geben. Insbesondere wird vorgeschlagen, daß die Sendevorrichtung eine Spule mit mehreren Windungen aufweist, daß die Windungen im wesentlichen in einer Ebene liegen und daß die Windungen in mindestens zwei Gruppen unterteilt sind, wobei die beiden Gruppen in einem gewissen Abstand voneinander angeordnet sind.With regard to the first-mentioned task, the invention creates a Solution to meet the two conflicting requirements: wider Surveillance zone and sufficiently high detection rate. In particular it is proposed that the transmitter device be a coil with several turns has that the turns are substantially in one plane and that the Windings are divided into at least two groups, the two groups are arranged at a certain distance from each other.

Mittels der erfindungsgemäßen Vorrichtung läßt sich die Feldstärke des Magnetfeldes in der Überwachungszone beträchtlich erhöhen, ohne daß der Energieverbrauch bezüglich einer entsprechenden Einrichtung, die die räumliche Trennung der Gruppen von Windungen nicht zeigt, ansteigen würde.
Von der anderen Seite betrachtet, bedeutet dies, daß die Breite der Zone, die von der erfindungsgemäßen Einrichtung sicher überwacht werden kann, größer wählbar ist als diejenige, die bislang von einer Einrichtung des Standes der Technik sicher überwacht werden konnte. By means of the device according to the invention, 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.

Durch die erfindungsgemäße Unterteilung der Windungen der Sendevorrichtung in mindestens zwei Gruppen, wobei die beiden Gruppen einen gewissen Abstand zueinander aufweisen, wird die gegenseitige Beeinflussung der Windungen und damit die Induktivität der Spule beträchtlich verringert. Die Verringerung der Induktivität der Spule geht einher mit einem Anstieg der Güte Q der Spule, wodurch insbesondere die Verluste im Hochfrequenzbereich vermindert werden. Die Güte Q ist folgendermaßen definiert: Q(ω):= ωL / R (ωL: Kreisfrequenz; R: der von der Kreisfrequenz ω abhängige Widerstand).The subdivision of the turns and thus the inductance of the coil is considerably reduced by the inventive division of the turns of the transmitting device into at least two groups, the two groups being at a certain distance from one another. 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 quality Q is defined as follows: Q (ω): = ω L / R (ω L : angular frequency; R: the resistance dependent on the angular frequency ω).

Die erfindungsgemäße Einrichtung bringt eine deutliche Verringerung der Induktivität bezüglich der bislang bekannten und verwendeten gedrängten Anordnung der einzelnen Windungen. Es ist daher möglich, die Anzahl der Windungen der Spule der Sendevorrichtung - und damit die Feldstärke innerhalb der Überwachungszone - zu erhöhen, ohne daß der Lastwiderstand bezüglich der bislang bekannt gewordenen Lösung ansteigen würde.The device according to the invention brings a significant reduction in Inductance with respect to the previously known and used crowded Arrangement of the individual turns. It is therefore possible to limit the number of Windings of the coil of the transmitter device - and thus the field strength within the surveillance zone - to increase without the load resistance with respect to the previously known solution would increase.

Als besonders vorteilhaft hat sich gemäß einer Weiterbildung der erfindungsgemäßen Einrichtung der Einsatz von Litze-Draht anstelle der sonst üblichen Kabel mit einem einzelnen Metalldraht erwiesen. Bei Litze-Draht, der sich aus einem Drahtgeflecht, bestehend aus einer Vielzahl dünner Drähte, zusammensetzt, macht sich der Skin-Effekt kaum bemerkbar, während dieser Effekt bei üblichem Draht zu einem starken Anwachsen des Widerstandes bei hohen Frequenzen führt.According to a further development, the device according to the invention the use of stranded wire instead of otherwise proven cables with a single metal wire. With stranded wire, the a wire mesh consisting of a multitude of thin wires, composed, the skin effect is hardly noticeable during this effect with conventional wire to a strong increase in resistance at high Frequencies.

Eine Weiterbildung der erfindungsgemäßen Einrichtung sieht vor, daß die Windungen in einer senkrecht zur Durchgangsrichtung durch die Überwachungszone liegenden Ebene angeordnet sind. Die Windungen der Spule können daher einmal so angeordnet sein, daß sie bei Draufsicht auf das Detektorgatter nebeneinander liegen. Damit haben die außen liegenden Windungen, insbesondere die Windungen der äußeren Gruppe, größere Abmessungen als die innen liegenden Windungen, bzw. die Windungen der inneren Gruppe. Diese Anordnung hat zweifellos den enormen Vorteil, daß die Breite der Detektorgatter sehr gering gewählt werden kann. A further development of the device according to the invention provides that the Turns in a direction perpendicular to the direction of passage through the Surveillance zone lying level are arranged. The turns of the coil can therefore be arranged so that they are in a top view of the Detector gates lie side by side. So that the outside have Turns, especially the turns of the outer group, larger Dimensions as the inner turns, or the turns of the inner Group. This arrangement undoubtedly has the enormous advantage that the width of the Detector gate can be chosen very low.

Die zweite Möglichkeit besteht darin, die Windungen derart anzuordnen, daß sie bei Draufsicht auf das Detektorgatter hintereinander liegen. Diese Anordnung erfordert zwar breitere Detektorgatter; als Ausgleich dafür bietet sie aber den Vorteil, daß die Windungen beider bzw. aller Gruppen die maximal mögliche Ausdehnung bei einer vorgegebenen Größe des Detektorgatters haben.The second possibility is to arrange the turns so that they are at Top view of the detector gate lying one behind the other. This arrangement requires wider detector gates; in return, it offers the advantage that the Turns of both or all groups the maximum possible expansion in one have a predetermined size of the detector gate.

Gemäß einer vorteilhaften Weiterbildung der erfindungsgemäßen Vorrichtung sind Abstandhalter vorgesehen sind, die die beiden Gruppen von Windungen räumlich voneinander trennen und auf einem gleichbleibenden Abstand halten.
Eine alternative Lösung schlägt zur Erhöhung der Stabilität des Detektorgatters folgendes vor: bei der Befestigung der Windungen der Sendevorrichtung ist zumindest in den beiden Seitenbereichen des Detektorgatters anstelle der Abstandhalter eine durch beidseitig angeordnete Stege gebildete Nut vorgesehen. In diese Nut wird nach der Montage ein Stab aus hartem Material eingeschoben.According to an advantageous development of the device according to the invention, 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.

Vorteilhaft ist es darüber hinaus, die erfindungsgemäße Einrichtung derart zu gestalten, daß die Sendevorrichtung und zumindest eine Empfangsvorrichtung in einem eine Einheit bildenden Detektorgatter angeordnet sind. Je nach Überwachungsbereich ist es durchaus möglich, in einem Detektorgatter eine Sendevorrichtung und zwei komplette Empfangsvorrichtungen, die ihrerseits wieder aus mehreren einzelnen Empfängerspulen kombiniert sind, unterzubringen. Die beiden Empfangseinrichtungen detektieren getrennt voneinander die charakteristischen Signale von Sicherungselementen aus zwei nebeneinander liegenden Überwachungszonen.
Alternativ ist es selbstverständlich auch möglich, die Sendevorrichtung und die Empfangsvorrichtung(en) in separaten Detektorgattern anzuordnen.It is also advantageous to design 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. Depending on the monitoring area, it is entirely possible to accommodate a transmitter device and two complete receiver devices in a detector gate, which in turn are combined from several individual receiver coils. The two receiving devices separately detect the characteristic signals from security elements from two adjacent monitoring zones.
Alternatively, it is of course also possible to arrange the transmitting device and the receiving device (s) in separate detector gates.

Eine besonders vorteilhafte Ausgestaltung der erfindungsgemäßen Einrichtung schlägt vor, daß im Falle der integralen Lösung das Detektorgatter aus einem äußeren Teil und einem inneren Teil besteht, wobei die Sendevorrichtung in dem äußeren Teil und die Empfangsvorrichtung(en) vorzugsweise in dem inneren Teil des Detektorgatters untergebracht sind. Insbesondere ist vorgesehen, das Detektorgatter mit durchbrochener Vorder- und Rückseite zu gestalten, was ihm ein modernes, offenes Design verleiht, das ästhetisch überaus ansprechend ist. Diese Ausgestaltung liefert aber auch technische Vorteile: der Materialverbrauch für die Empfangsvorrichtung(en) läßt sich infolge ihrer geringen Flächenausdehnung beträchtlich reduzieren.A particularly advantageous embodiment of the device according to the invention suggests that in the case of the integral solution, the detector gate from one outer part and an inner part, wherein the transmitting device in the outer part and the receiving device (s) preferably in the inner part of the detector gate are housed. In particular, it is provided that Detector gates with openwork front and back to shape what suits him gives a modern, open design that is aesthetically extremely appealing. This Design also provides technical advantages: the material consumption for the Receiving device (s) can be due to their small surface area reduce considerably.

Aus der EP 0 428 384 B1 ist ein universeller Gatterzusammenbau zur Verwendung bei der elektronischen Artikelsicherung bekannt geworden. Das Detektorgatter setzt sich aus einem am Boden verankerbaren Untergestell, einem oberen Abschnitt mit parallel zueinander verlaufenden Seitenabschnitten sowie mit einem Mittelteil zusammen, die starr mit dem Untergestell und einem Oberteil verbunden sind. Weiterhin sind Mittel zum Verbinden der beiden Gehäusehälften in vorgegebenen Positionen vorgesehen. Die Windungen der Sende- und der Empfangsspulen verlaufen oberhalb des Untergestells Während die Windungen der Sendevorrichtung in den Randbereichen des oberen Abschnitts verlaufen, sind die Windungen der Empfängerspulen in dem Mittelteil des Detektorgatters zu finden.EP 0 428 384 B1 uses a universal gate assembly become known in electronic article surveillance. The detector gate sets consists of a base that can be anchored to the floor, an upper section with parallel side sections and with a central part together, the are rigidly connected to the base and an upper part. Furthermore, funds are for connecting the two housing halves in predetermined positions intended. The turns of the transmitting and receiving coils run above the base while the windings of the transmitter in the Edge areas of the upper section run, are the turns of the Find receiver coils in the middle part of the detector gate.

Die konstruktive Zusammensetzung des Detektorgatters weicht von dieser bekannt gewordenen Konstruktion entscheidend ab. Das Detektorgatter besteht aus zwei - vorzugsweise im Spritzgußverfahren hergestellten - Halbschalen. Die Halbschalen bilden einen umlaufenden Rahmen mit einem Mittelteil, das die durch den Rahmen vorgegebene Fläche in zwei Hälften teilt. Die Windungen der Sendevorrichtung sind im Rahmen des Detektorgatters angeordnet sind; für die Sendevorrichtung wird also näherungsweise die maximal zur Verfügung stehende Fläche des Detektorgatters ausgenützt. Hingegen sind die Empfängerspulen vorzugsweise in dem Mittelteil des Detektorgatters zu finden. Selbstverständlich ist die neue konstruktive Zusammensetzung des Detektorgatters nicht auf die erfindungsgemäße Unterteilung der Windungen der Sendespule in zwei Gruppen beschränkt, sondern generell für beliebig ausgestattete Detektorgatter verwendbar.The constructive composition of the detector gate gives way from this known construction decisively. The detector gate consists of two - half shells - preferably manufactured by injection molding. The half-shells form a circumferential frame with a central part that the divides the area specified by the frame into two halves. The turns of the Transmitting devices are arranged in the frame of the detector gate; for the Transmitting device is therefore approximately the maximum available Utilized surface of the detector gate. In contrast, the receiver coils preferably found in the middle part of the detector gate. It goes without saying the new design composition of the detector gate does not affect the division of the turns of the transmitter coil into two groups limited, but generally usable for arbitrarily equipped detector gates.

Die Empfangsvorrichtung ist vorteilhafterweise derart ausgebildet, daß sie zumindest eine Empfängerspule aufweist. Vorteilhafterweise ist die Empfängerspule so gewickelt, daß sie mehrpolig ist; vorzugsweise weist sie eine Quadrupolcharakteristik auf. Durch eine derartige Ausgestaltung läßt sich sowohl der Einfluß der Sendevorrichtung als auch der Einfluß von elektromagnetischen Feldern, die von außerhalb der Überwachungszone herrühren (--> Fernfelder), auf die Empfängerspulen erheblich reduzieren.The receiving device is advantageously designed such that it has at least one receiver coil. The receiver coil is advantageous so wound that it has multiple poles; preferably it has one Quadrupole characteristic. With such a configuration, both the influence of the transmitter as well as the influence of electromagnetic Fields that come from outside the surveillance zone (-> far fields) significantly reduce the receiver coils.

Ein weiterer Vorteil zeigt sich bei der Verwendung mehrerer Empfängerspulen: hier werden die einzelnen Empfängerspulen so aufeinander abgestimmt, daß die Detektionsrate in allen Bereichen der Überwachungszone ausreichend hoch ist. Beispielsweise hat eine als 'Acht' geformte Empfängerspule eine Null-Detektionsrate auf einer Linie, die durch den Schnittpunkt zwischen oberer und unterer Schleife der 'Acht' verläuft und parallel zum oberen bzw. unteren Rand des Detektorgatters ist. Wird dieser Empfängerspule eine weitere 'Quadrupol-Offset-Acht' überlagert, so daß der mittlere Bereich einer der beiden Schleifen der 'Quadrupol-Offset-Acht' dem Bereich überlagert ist, in dem sich die beiden Schleifen der ersten 'Acht' schneiden, wird sichergestellt, daß die Detektionsrate der Empfängerspulen an keiner Stelle gleich Null ist.Another advantage can be seen when using multiple receiver coils: here the individual receiver coils are coordinated so that the Detection rate in all areas of the surveillance zone is sufficiently high. For example, a receiver coil shaped as an 'eight' has a zero detection rate on a line through the intersection between the upper and lower loops of the 'Eight' runs and is parallel to the upper or lower edge of the detector gate. If a further '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' Area where the two loops of the first 'eight' intersect, it is ensured that the detection rate of the receiver coils is nowhere is zero.

Ein zusätzlicher Vorteil bei der Nutzung mehrerer Empfängerspulen ergibt sich daraus, daß infolge der unterschiedlichen Detektionsempfindlichkeiten der Spulen in unterschiedlichen Bereichen der Überwachungszone ein zusätzlicher Schutz vor Fehlalarmen erzielt wird. Insbesondere wird hier Bezug genommen auf Fehlalarme, die durch Störquellen hervorgerufen wird, die sich in unmittelbarer Nähe der Überwachungszone befinden. Die Erhöhung der Sicherheit kommt dadurch zustande, daß es sehr unwahrscheinlich ist, daß eine Störquelle mit allen unterschiedlich geformten Empfängerspulen in gleicher Weise interferiert.There is an additional advantage when using multiple receiver coils from the fact that due to the different detection sensitivities of the coils in protection from different areas of the surveillance zone False alarms is achieved. In particular, reference is made here to false alarms, which is caused by sources of interference located in the immediate vicinity of the Surveillance zone. This increases security state that it is very unlikely to be a source of interference with everyone differently shaped receiver coils interfered in the same way.

Die erfindungsgemäße Einrichtung ist für alle möglichen Ausbildungen von Sicherungselementen einsetzbar. So kann es sich bei dem elektronischen Sicherungselement um ein Element handeln, das aus einem Material mit hoher Permeabilität und geringer Koerzitivkraft (weichmagnetisches Material) gefertigt ist. Weiterhin werden von der erfindungsgemäßen Einrichtung Sicherungselemente detektiert, die aus einem Material mit magnetostriktiven Eigenschaften gefertigt sind. Gleiches gilt prinzipiell für Sicherungselemente, die einen Resonanzschwingkreis aufweisen. Sicherungselemente mit den vorhergehend beschriebenen Eigenschaften sind beispielsweise aus den folgenden europäischen Patentschriften bekannt geworden: der EP 0 295 028 B1, der EP 0 181 327 B1 und der EP 0 093 281 B1.The device according to the invention is for all possible forms of Fuse elements can be used. So it can be with the electronic Securing element is an element that is made of a material with high Permeability and low coercive force (soft magnetic material) is made. Furthermore, the device according to the invention provides security elements detected, which are made of a material with magnetostrictive properties. The same applies in principle to fuse elements that have a resonant circuit exhibit. Securing elements with the previously described Properties are, for example, from the following European patents become known: EP 0 295 028 B1, EP 0 181 327 B1 and EP 0 093 281 B1.

Die Erfindung wird anhand der nachfolgenden Figuren näher erläutert. Es zeigt:

  • Fig. 1: eine schematische Darstellung der erfindungsgemäßen Einrichtung,
  • Fig. 2: eine bevorzugte Ausführungsform der erfindungsgemäßen Einrichtung in teilweisem Schnitt,
  • Fig. 3: eine Draufsicht auf das Detektorgatter von oben,
  • Fig. 4: einen Schnitt gemäß der Kennzeichnung IV-IV in Fig. 2,
  • Fig. 5: einen Schnitt gemäß der Kennzeichnung V-V in Fig. 2,
  • Fig. 6: einen Schnitt gemäß der Kennzeichnung VI-VI in Fig. 2,
  • Fig. 7: einen Schnitt gemäß der Kennzeichnung VII-VII in Fig. 2,
  • Fig. 8: einen Schnitt gemäß der Kennzeichnung VIII-VIII in Fig. 2,
  • Fig. 9: einen Schnitt gemäß der Kennzeichnung IX-IX in Fig. 2,
  • Fig. 10: einen Schnitt gemäß der Kennzeichnung X-X in Fig. 2,
  • Fig. 11: einen Schnitt gemäß der Kennzeichnung XI-XI in Fig. 2,
  • Fig. 12: einen Schnitt gemäß der Kennzeichnung XII-XII in Fig. 2.
  • Fig. 13: eine weitere Ausführungsform der erfindungsgemäßen Einrichtung in teilweisem Schnitt,
  • Fig. 14: einen Schnitt gemäß der Kennzeichnung XIV-XIV in Fig. 13,
  • Fig. 15: einen Schnitt gemäß der Kennzeichnung XV-XV in Fig. 13 und
  • Fig. 16: einen Schnitt gemäß der Kennzeichnung XVI-XVI in Fig. 13.
    • The invention is explained in more detail with reference to the following figures. It shows:
  • 1: a schematic representation of the device according to the invention,
  • 2: a preferred embodiment of the device according to the invention in partial section,
  • 3: a top view of the detector gate from above,
  • 4: a section according to the identification IV-IV in FIG. 2,
  • 5: a section according to the marking VV in Fig. 2,
  • 6: a section according to the marking VI-VI in Fig. 2,
  • 7: a section according to the identification VII-VII in Fig. 2,
  • 8: a section according to the marking VIII-VIII in Fig. 2,
  • 9: a section according to the identification IX-IX in FIG. 2,
  • 10: a section according to the marking XX in Fig. 2,
  • 11: a section according to the identification XI-XI in FIG. 2,
  • FIG. 12: a section according to the identification XII-XII in FIG. 2.
  • 13: a further embodiment of the device according to the invention in partial section,
  • 14: a section according to the identification XIV-XIV in Fig. 13,
  • Fig. 15: a section according to the identification XV-XV in Fig. 13 and
  • 16: a section according to the identification XVI-XVI in FIG. 13.

    • Fig. 1 zeigt schematisch die erfindungsgemäße Einrichtung 1 zur Detektierung eines mit einem Sicherungselement 2 versehenen Artikels in einer Überwachungszone 3. Die Überwachungszone 3 wird von zwei parallel aufgestellten Detektorgattern 4 gebildet, die die Sendevorrichtung 5 und die Empfangsvorrichtung 6 enthalten. Die Sendevorrichtung 5 wird von der Energieversorgung 7 rechnergesteuert derart bestromt, daß sie ein magnetisches Wechselfeld (mehrere magnetische Wechselfelder) mit der (den) gewünschten Frequenz(en) in die Überwachungszone 3 aussendet. Die Frequenz(en) ist (sind) auf die jeweilige Beschaffenheit des verwendeten Sicherungselementes 2 abgestimmt. Da die Detektionsrate u.a. von der Lage des Sicherungselementes 2 bezüglich des magnetischen Wechselfeldes in der Überwachungszone 3 abhängt - das charakteristische Signal ist maximal, wenn das Magnetfeld und die Ausrichtung des Sicherungselementes 2 parallel zueinander stehen, und es ist Null bei senkrechter Ausrichtung -, muß darüber hinaus die Feldstärke des Magnetfeldes so gewählt werden, daß das Sicherungselement 2 auch in den Zwischenlagen ein ausreichend starkes charakteristisches Signal aussendet, das von der Empfangsvorrichtung 6 detektierbar ist. Ein spezielles Verfahren zur Detektierung eines Sicherungselementes 2 in der Überwachungszone 3 ist beispielsweise aus der EP 0 153 286 B1 bekannt geworden.1 schematically shows the device 1 according to the invention for detecting a Article provided with a securing element 2 in a surveillance zone 3. The monitoring zone 3 is made up of two detector gates 4 placed in parallel formed, which contain the transmitting device 5 and the receiving device 6. The transmission device 5 is computer-controlled by the energy supply 7 in this way energized that they have an alternating magnetic field (several magnetic Alternating fields) with the desired frequency (s) into the monitoring zone 3 sends out. The frequency (s) is (are) based on the particular nature of the used fuse element 2 matched. Since the detection rate i.a. of the Location of the securing element 2 with respect to the alternating magnetic field in the Surveillance zone 3 depends - the characteristic signal is maximum if that Magnetic field and the alignment of the securing element 2 parallel to each other stand, and it is zero with vertical alignment -, must also the Field strength of the magnetic field can be selected so that the securing element 2 A sufficiently strong characteristic signal even in the intermediate layers transmits, which can be detected by the receiving device 6. A special one Method for detecting a security element 2 in the monitoring zone 3 has become known, for example, from EP 0 153 286 B1.

    Die Empfangsvorrichtung(en) 6, die in einem oder in beiden Detektorgattern 4 der erfindungsgemäßen Einrichtung 1 angeordnet ist (sind), ist (sind) mit einer Rechen-/Ansteuereinrichtung 8 verbunden. Diese Rechen-/Ansteuereinrichtung 8 wertet die Signale der Empfangsvorrichtung(en) aus und veranlaßt bei Erkennung eines charakteristischen Signals eine Alarmvorrichtung 9 zur Abgabe eines Alarms. The receiving device (s) 6, which in one or in both detector gates 4 of the The device 1 according to the invention is (are), is (are) equipped with a computing / control device 8 connected. This computing / control device 8 evaluates the Signals of the receiving device (s) and causes a characteristic signal an alarm device 9 for emitting an alarm.

    In Fig. 2 ist eine bevorzugte Ausführungsform der erfindungsgemäßen Einrichtung 1 in teilweisem Schnitt dargestellt. Das Detektorgatter 4 besteht - grob gesprochen - aus zwei Teilbereichen: einem äußeren, rahmenartigen Teil 10 und einem inneren Teil 11, der zwischen dem unteren und oberen Teil des Rahmens angeordnet ist. In dem äußeren Teil 10 ist die Sendevorrichtung 5 und in dem inneren Teil 11 ist die Empfangsvorrichtung 6 angeordnet. Sowohl der äußere Teil 10 als auch der innere Teil 11 bestehen aus zwei zusammenfügbaren, schalenförmigen Rahmenhälften 23, 24, die zur Aufnahme der Sendevorrichtung 5 und der Empfangsvorrichtung(en) 6 dienen. An den beiden seitlichen Bereichen des äußeren Teils 10 sind Halteelemente 17 angebracht. Mittels der Bodenhalterungen 22, die beispielsweise aus einem im Boden verankerten Bolzen und einer Mutter bestehen, werden die Halteelemente 17 fixiert.FIG. 2 shows a preferred embodiment of the device 1 according to the invention shown in partial section. The detector gate 4 is - roughly speaking - from two sections: an outer, frame-like part 10 and an inner Part 11, which is arranged between the lower and upper part of the frame. In the outer part 10 is the transmitter 5 and in the inner part 11 is the Receiving device 6 arranged. Both the outer part 10 and the inner part Part 11 consist of two joinable, shell-shaped frame halves 23, 24 for receiving the transmitting device 5 and the receiving device (s) 6 serve. On the two lateral areas of the outer part 10 are Holding elements 17 attached. By means of the floor brackets 22, for example consist of a bolt anchored in the ground and a nut, the Holding elements 17 fixed.

    Im folgenden wird zuerst der Aufbau der bevorzugten Sendevorrichtung 5, dann der Aufbau der bevorzugten Empfangsvorrichtung 6 beschrieben.
    Die Sendevorrichtung 5 besteht aus achtzehn Windungen 12, die gemäß der Erfindung in zwei Gruppen 13a, 13b von Windungen 12 unterteilt sind. Im gezeigten Fall hat jede der beiden Gruppen 13a, 13b jeweils die gleiche Anzahl von Windungen 12. Generell ist die Unterteilung der Windungen 12 in Gruppen 13a, 13b jedoch in beliebigen Konstellationen möglich.    The structure of the preferred transmission device 5, then the structure of the preferred reception device 6 is described below.
    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.

    Die Lücke 15 zwischen den beiden Gruppen 13a, 13b von Windungen 12 wird durch Abstandhalter 14 geschaffen, die in einem definierten Abstand voneinander längs der Spulenwindungen 12 angeordnet sind. Die Abstandhalter 14 haben im Bereich der von ihnen geschaffenen Lücke 15 jeweils eine Bohrung 28, die zur Aufnahme einer Schraube 29 dient. Diese Schrauben 29 haben zusätzlich die Funktion, die beiden Rahmenhälften 23, 24 miteinander zu verbinden.The gap 15 between the two groups 13a, 13b of turns 12 is closed Spacers 14 created that are longitudinally spaced apart from each other the coil turns 12 are arranged. The spacers 14 have in the area The gap 15 created by them each has a bore 28 which is for receiving a screw 29 is used. These screws 29 also have the function of to connect the two frame halves 23, 24 to one another.

    Im dargestellten Fall sind die Windungen 12 bei Draufsicht auf die Vorder- bzw. die Rückseite des Detektorgatters 4 nebeneinander angeordnet. Wie bereits an vorhergehender Stelle erwähnt, arbeitet die Sendevorrichtung 5 ebenfalls ausgezeichnet, wenn die Windungen 12 - in Blickrichtung auf die Vorder- bzw. Rückseite des Detektorgatters 4 - hintereinander angeordnet sind.In the case shown, the turns 12 are a top view of the front or the Rear of the detector gate 4 arranged side by side. As already stated mentioned above, the transmitting device 5 operates also excellent if the turns 12 - in the direction of view of the front or Rear of the detector gate 4 - are arranged one behind the other.

    Die Montage der Empfangsvorrichtung 6 und der Windungen 12 der Sendevorrichtung 5 erfolgt in den folgenden Schritten:

  • 1. Die Empfängerspulen 18, 19, 20 der Empfangsvorrichtung 6 werden im inneren Teil 11 des Detektorgatters 4 angebracht.
  • 2. Die vordere Rahmenhälfte 23 und die hintere Rahmenhälfte 24 werden über die Ausrichtemittel 32 vorjustiert.
  • 3. Die innere Gruppe 13b von Windungen 12 wird im äußeren Teil 10 des Detektorgatters 4 montiert, wobei die Stege 31 eine seitliche Begrenzung für die Windungen 12 darstellen.
  • 4. Die Abstandhalter 14 werden eingefügt und mittels der Schrauben 29 bzw. 36 an den beiden Rahmenhälften 23, 24 festgeschraubt. Die Abstandhalter 14 übernehmen dabei die zusätzliche Funktion, einen definierten Abstand zwischen den beiden Rahmenhälften zu schaffen.
  • 5. Anschließend wird die äußere Gruppe 13a von Windungen 12 in den Spalt zwischen den beiden Rahmenhälften 23, 24 eingefügt, wobei die Abstandhalter 14 die seitliche Fixierung der Windungen 12 übernehmen.
  • 6. Der Keder 27 wird in den umlaufenden Spalt zwischen den beiden Rahmenhälften 23, 24 eingepaßt. Hierdurch wird eine Fixierung der seitlichen Lage der äußeren Gruppe 13a von Windungen 12 erreicht.
    Wo erforderlich, werden bei den einzelnen Schritten die Windungen 12 der Gruppen 13a, 13b elektrisch angeschlossen.
    • The reception device 6 and the turns 12 of the transmission device 5 are assembled in the following steps:
  • 1. The receiver coils 18, 19, 20 of the receiving device 6 are attached in the inner part 11 of the detector gate 4.
  • 2. The front frame half 23 and the rear frame half 24 are pre-adjusted via the alignment means 32.
  • 3. The inner group 13b of turns 12 is mounted in the outer part 10 of the detector gate 4, the webs 31 representing a lateral boundary for the turns 12.
  • 4. The spacers 14 are inserted and screwed onto the two frame halves 23, 24 by means of the screws 29 and 36, respectively. The spacers 14 take on the additional function of creating a defined distance between the two frame halves.
  • 5. The outer group 13a of windings 12 is then inserted into the gap between the two frame halves 23, 24, the spacers 14 taking over the lateral fixation of the windings 12.
  • 6. The piping 27 is fitted into the circumferential gap between the two frame halves 23, 24. This fixes the lateral position of the outer group 13a of turns 12.
    Where necessary, the turns 12 of the groups 13a, 13b are electrically connected in the individual steps.

    • Erfindungsgemäß wird durch die Unterteilung der Windungen 12 und die zwischen den Gruppen 13a, 13b liegende Lücke 15 die Induktivität der die Sendevorrichtung 5 verkörpernden Spule erheblich vermindert. Durch die Lücke 15 zwischen den beiden Gruppen 13a, 13b wird es möglich, die Anzahl der Windungen 12 und damit die Feldstärke in der Überwachungszone 3 zu erhöhen, ohne zusätzlich Verlustleistungen hinnehmen zu müssen.According to the invention, by dividing the turns 12 and between the gap 15 lying in groups 13a, 13b is the inductance of the transmitting device 5 embodying coil significantly reduced. Through the gap 15 between the two Groups 13a, 13b make it possible to determine the number of turns 12 and thus the number of turns To increase field strength in monitoring zone 3 without additional Having to accept power losses.

    Die Sendevorrichtung 5 wird rechnergesteuert von der Energieversorgung 7 derart bestromt, daß ein magnetisches Wechselfeld mit den gewünschten Frequenzen in die Überwachungszone 3 ausgesendet wird. Bei diesen Frequenzen handelt es sich - der EP 0 153 286 B1 folgend - beispielsweise um eine Niederfrequenz im Hertzbereich und zwei Hochfrequenzen im Kilohertzbereich.The transmission device 5 is computer-controlled by the energy supply 7 in this way energized that an alternating magnetic field with the desired frequencies in surveillance zone 3 is transmitted. These frequencies are - Following EP 0 153 286 B1 - for example around a low frequency in the Hertz range and two radio frequencies in the kilohertz range.

    Die Rechen-/Ansteuereinrichtung 8 ist im gezeigten Fall in Form einer Rechnerkarte im unteren Teil des Detektorgatters 4 untergebracht und von außen nach Öffnen der Klappe 16 frei zugänglich. Der untere Teil des Detektorgatters 4 ist derart ausgestaltet, daß er einen Freiraum zwischen der äußeren Gruppe 13a der Windungen 12 und dem Boden beläßt. In diesem Freiraum 30 ist ausreichend Platz für Leitungskabel, die von außen an das Detektorgatter 4 gelegt werden. Desweiteren ist bei geschlossener Klappe 16 genügend Platz zwischen den Gruppen 13a, 13b von Windungen 12 und der Klappe 16 selbst, so daß die von außen kommenden Leitungskabel problemlos an die Rechen-/Ansteuereinrichtung 8, hier eine Rechnerkarte, geführt werden können. Die verdeckte Führung der Leitungskabel rundet den harmonischen Gesamteindruck des Detektorgatters 4 ab.In the case shown, the computing / control device 8 is in the form of a computer card housed in the lower part of the detector gate 4 and from the outside after opening the Flap 16 freely accessible. The lower part of the detector gate 4 is such designed to have a space between the outer group 13a Turns 12 and the bottom. There is sufficient space in this free space 30 for cables that are placed on the detector gate 4 from the outside. Furthermore, when the flap 16 is closed, there is sufficient space between the Groups 13a, 13b of turns 12 and the flap 16 itself, so that the of outside cable easily to the computing / control device 8, here a computer card, can be performed. The undercover leadership of the Cable rounds off the overall harmonic impression of the detector gate 4.

    Die Empfangsvorrichtung 6 ist - wie bereits erwähnt - im inneren Teil 11 des Detektorgatters 4 angeordnet. Die Empfangsvorrichtung 6 besteht gemäß einer besonders günstigen Ausgestaltung aus drei miteinander kombinierten Empfängerspulen 18, 19,20. Die Empfängerspule 18 besteht aus zwei waagerecht nebeneinander liegenden Schleifen 21, die in Serie geschaltet sind, so daß die Windungen in entgegengesetzten Richtungen vom Strom durchflossen werden. Während die Empfängerspule 18 also eine waagerecht liegende "Acht" verkörpert, besteht die Empfängerspule 19 aus einer senkrecht stehenden "Acht", und die Empfängerspule 20 setzt sich effektiv aus zwei untereinander liegenden "Achten", einer sog. Offset-Acht, zusammen. Die Formen der gewählten Empfängerspulen 18, 19, 20 stellen, insbesondere in Kombination, eine ausreichende Detektionsrate für ein elektronisches Sicherungselement 2 im gesamten Bereich der Überwachungszone 3 sicher. Alle drei Empfängerspulen koppeln nur in geringem Maß untereinander oder mit der Sendevorrichtung 5. Weiterhin zeichnen sie sich - wie bereits an vorhergehender Stelle beschrieben - dadurch aus, daß sie relativ unempfindlich für Fernfelder sind, die von außerhalb der Überwachungszone 3 herrühren.The receiving device 6 is - as already mentioned - in the inner part 11 of the Detector gate 4 arranged. The receiving device 6 exists according to one particularly favorable embodiment of three combined with each other Receiver coils 18, 19.20. The receiver coil 18 consists of two horizontally adjacent loops 21 which are connected in series, so that the The current flows through windings in opposite directions. So while the receiver coil 18 embodies a horizontal "figure eight", the receiver coil 19 consists of a vertical "eight", and the Receiver coil 20 is effectively composed of two "eighties" lying one below the other, a so-called offset eight, together. The shapes of the selected receiver coils 18, 19, 20, especially in combination, provide a sufficient detection rate for an electronic security element 2 in the entire area of Surveillance zone 3 safe. All three receiver coils couple only slightly Measure with each other or with the transmitter 5. Furthermore, they stand out - how already described in the previous place - in that they are relative are insensitive to far fields from outside the surveillance zone 3 come from.

    Im Bereich des inneren Teils 10 sind Stifte 33 angeordnet. Diese Stifte 33 dienen dem Zwecke, die Windungen 12 der Empfängerspulen 18, 19, 20 in den gewünschten Positionen zu fixieren.Pins 33 are arranged in the region of the inner part 10. These pins 33 serve the purpose, the turns 12 of the receiver coils 18, 19, 20 in the fix desired positions.

    Die Form der Empfängerspulen 18, 19, 20 ist derart gewählt, daß sie die Sensitivität von Quadrupolfeldern haben. Durch diese Konstellation wird eine ausreichende Empfindlichkeit der Empfangsvorrichtung 6 im mittleren Bereich des Detektorgatters 4 auch bei geringer Dimensionierung erzielt. Darüber hinaus lassen sich Störsignale von Fernfeldern in ausreichend hohem Maße ausschalten, so daß die Detektionsrate für die die Überwachungszone passierenden Sicherungselemente 2 optimal ist.The shape of the receiver coils 18, 19, 20 is chosen such that it sensitivity of quadrupole fields. This constellation is sufficient Sensitivity of the receiving device 6 in the central region of the detector gate 4 achieved even with small dimensions. In addition, interference signals switch off from far fields to a sufficient extent so that the Detection rate for the security elements passing the surveillance zone 2 is optimal.

    Sobald die Empfangsvorrichtung 6 ein Signal empfängt, das die Rechen-/Ansteuereinrichtung 8 nachfolgend als charakteristisches, von einem Sicherungselement 2 ausgesendetes Signal erkennt, schickt sie einen Impuls an die Alarmvorrichtung 9, die dann akustisch über die beiden Buzzer 25 und/oder optisch mittels des Blinklichtes 26 den unerlaubten Aufenthalt eines elektronisch gesicherten Artikels in der Überwachungszone 3 anzeigt. Gut sichtbar ist die Alarmvorrichtung 9 in Fig. 3, die eine Draufsicht auf das Detektorgatter 4 von oben wiedergibt.
    Weiterhin ist in Fig. 3 die Ausnehmung zwischen den beiden schalenförmigen Rahmenhälften 23, 24 ersichtlich. Sie wird durch einen sog. Keder 27, einen elastischen Verschluß, abgedichtet. Die im unteren Bereich des äußeren Teils 10 des Detektorgatters 4 angebrachten Halteelemente 17 werden mittels der Bodenhalterungen 22 im Boden verankert. Die Justierschrauben 37 dienen zur Feinausrichtung des Detektorgatters 4.    As soon as 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 area of the outer part 10 of the detector gate 4 are anchored in the floor by means of the floor brackets 22. The adjusting screws 37 are used for fine alignment of the detector gate 4.

    Fig. 4 bis Fig. 12 zeigen die in der Fig. 2 mit entsprechenden römischen Ziffern gekennzeichneten Schnitte. In Fig. 4 ist ein Schnitt durch eine obere Ecke des äußeren Teils 10 des Detektorgatters 4 dargestellt. Die an den Innenseiten der beiden Rahmenhälften 23, 24 angebrachten Stege 31 dienen dazu, eine seitliche Begrenzung für die Windungen 12 der inneren Gruppe 13b zu schaffen. Ansonsten tragen sie zur Stabilität des äußeren Teils 10 der beiden Rahmenhälften 23, 24 bei. Die beiden Rahmenhälften 23, 24 werden mittels Schrauben 29, die durch Bohrungen 28 geführt sind, miteinander verschraubt.4 to 12 show those in FIG. 2 with corresponding Roman numerals marked cuts. In Fig. 4 is a section through an upper corner of the outer part 10 of the detector gate 4 shown. The inside of the two frame halves 23, 24 attached webs 31 serve a lateral To create a limit for the turns 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 23, 24 are secured by means of screws 29 which are passed through bores 28 are screwed together.

    Fig. 5 zeigt einen Querschnitt durch die obere Ecke des äußeren Teils 10 des Detektorgatters 4. Die beiden Rahmenhälften 23, 24 weisen Bohrungen 28 zur Aufnahme der Schrauben 29 auf. Die Bohrungen 28 bzw. die Schrauben 29 sind im Bereich der Lücke 15 zwischen den beiden Gruppen 13a, 13b von Windungen 12 angeordnet. Weiterhin fixiert ein Teil der Schrauben 29 die Abstandhalter 14 in den gewünschten Positionen. Bei diesen Abstandhaltern 14 handelt es sich um Elemente aus Plastik, die im Bereich der Lücke 15 einen von der Bohrung 28 durchbrochenen Bereich aufweisen und die im Bereich der äußeren Gruppe 13a von Windungen 12 einen Schlitz zur Aufnahme der Windungen 12 besitzen. Die von den beiden Rahmenhälften 23, 24 freigelassene Ausnehmung am Rand des äußeren Teils 10 wird von einem elastischen Verschlußelement, einem sog. Keder 27, abgedichtet.Fig. 5 shows a cross section through the upper corner of the outer part 10 of the Detector gate 4. The two frame halves 23, 24 have holes 28 for Take up the screws 29. The holes 28 and the screws 29 are in the Area of the gap 15 between the two groups 13a, 13b of turns 12 arranged. Furthermore, some of the screws 29 fix the spacers 14 in the desired positions. These spacers 14 are elements made of plastic, one in the area of the gap 15 through the bore 28 pierced Have area and that in the area of the outer group 13a of turns 12 have a slot for receiving the turns 12. The one of the two Frame halves 23, 24 left recess at the edge of the outer part 10 is sealed by an elastic closure element, a so-called piping 27.

    In Fig. 6 ist ein Querschnitt durch den äußeren Teil 10 des Detektorgatters 4 im Bereich der seitlichen Halteelemente 17 wiedergegeben. Fig. 7 bezieht sich auf einen parallelen Schnitt im Bereich eines Abstandhalters 14.6 is a cross section through the outer part 10 of the detector gate 4 in Area of the lateral holding elements 17 reproduced. 7 relates to a parallel section in the area of a spacer 14.

    In Fig. 8 ist ein Schnitt durch den Bodenteil des äußeren Teils 10 des Detektorgatters 4 dargestellt. Zusätzlich zu den bereits in den vorhergehenden Zeichnungen beschriebenen Teilen ist in dieser Fig. 8 der Freiraum 30 zur Aufnahme der Leitungen zu sehen. In Fig. 8 is a section through the bottom part of the outer part 10 of the Detector gate 4 shown. In addition to those already in the previous Parts described in this drawing is the free space 30 in FIG See the lines.

    Fig. 9 zeigt einen Schnitt durch den inneren Teil 11 des Detektorgatters 4 gemäß der Kennzeichnung IX-IX in Fig. 2. Neben der hinteren Rahmenhälfte 24 und der vorderen Rahmenhälfte 23 sind aus dieser Figur die Anordnung der Windungen 12 der Empfängerspulen 18, 19, 20 ersichtlich. Die einzelnen Windungen 12 werden in Klemmelementen 35 geführt.FIG. 9 shows a section through the inner part 11 of the detector gate 4 according to FIG the marking IX-IX in Fig. 2. In addition to the rear frame 24 and the Front frame half 23 are the arrangement of the turns 12 from this figure the receiver coils 18, 19, 20 can be seen. The individual turns 12 are in Clamping elements 35 out.

    Fig. 10 zeigt einen Querschnitt durch den Bereich, der den akustischen Teil der Alarmeinrichtung 9 enthält. Insbesondere sind in dieser Zeichnung die beiden Buzzer 25 dargestellt.Fig. 10 shows a cross section through the area that the acoustic part of the Alarm device 9 contains. In particular, the two are in this drawing Buzzer 25 shown.

    In Fig. 11 ist ein Schnitt durch den optischen Teil der Alarmeinrichtung 9 zu sehen. In einem Gehäuse, das von einer transparenten, farbigen Kappe 34 abgedeckt ist, ist (sind) ein (ein oder zwei) Blinklicht(er) 26 angeordnet, das (die) in Kombination mit den beiden Buzzern 25 nicht zu übersehende bzw. nicht zu überhörende Alarmsignale aussendet, sobald die Rechen-/Ansteuereinrichtung 8 das charakteristische Signal eines Sicherungselementes 2 in der Überwachungszone 3 ausmacht.11 shows a section through the optical part of the alarm device 9. In a housing that is covered by a transparent, colored cap 34, is (are) one (or two) flashing light (s) 26 arranged, the (the) in combination with the two buzzer 25 not to be overlooked or not to be overheard Sends out alarm signals as soon as the computing / control device 8 characteristic signal of a security element 2 in the monitoring zone 3 matters.

    Fig. 12 zeigt den Schnitt gemäß der Kennzeichnung XII-XII in Fig. 2 im Bereich eines der sechs Ausrichtemittel 32, die im inneren Teil 11 des Detektorgatters 4 zu finden sind. Wie bereits an vorhergehender Stelle erwähnt, handelt es sich bei diesen Ausrichtemitteln 32 um Elemente, die das Zusammenfügen der beiden Rahmenhälften 23, 24 nach Montage der Empfangsvorrichtung(en) 6 erleichtern sollen. Im dargestellten Fall handelt es sich bei dem Ausrichtemittel 32 um zwei paßgenau ineinandersteckbare Elemente, wobei eines dieser Elemente an der Innenseite der vorderen Rahmenhälfte 23 und das andere Element an der Innenseite der hinteren Rahmenhälfte 24 angebracht ist.Fig. 12 shows the section according to the identification XII-XII in Fig. 2 in the area one of the six alignment means 32, which in the inner part 11 of the detector gate 4 are to be found. As mentioned earlier, it is about this alignment means 32 to elements that join the two Lighten the frame halves 23, 24 after mounting the receiving device (s) 6 should. In the case shown, the alignment means 32 is two elements that fit snugly into one another, one of these elements on the Inside of the front frame half 23 and the other element on the Inside the rear frame half 24 is attached.

    In Fig. 13 ist eine weitere Ausführungsform der erfindungsgemäßen Einrichtung dargestellt. Sie unterscheidet sich von der zuvorbeschriebenen Ausführungsform lediglich durch die Art der Befestigung der Windungen 12 der Sendevorrichtung 5. In dem unteren und oberen Bereich des Rahmens erfolgt die Befestigung weiterhin über die Abstandhalter 14. In den seitlichen Bereichen sind diese durch zwei zwischen den beiden Gruppen 13a, 13b von Windungen 12 verlaufende Stege 38, 39 ersetzt. Durch diese Konstruktion wird eine erheblich höhere Stabilität des Detektorgatters 4 gegen von außen kommende Einwirkungen erreicht. Optimieren läßt sich die Stabilität des Detektorgatters 4 durch Einfügen eines Stabes 40 aus einem harten Material in den Freiraum zwischen die beiden Stege 38, 39. Die Figuren Fig. 14, Fig. 15 und Fig. 16 zeigen die in der Fig. 13 gekennzeichneten Schnitte. Alle weiteren Einzelheiten der Ausführungsform der Figuren Fig. 13, Fig. 14, Fig. 15 und Fig. 16 entsprechen den in den vorhergehenden Figuren gezeigten Einzelheiten. 13 shows a further embodiment of the device according to the invention shown. It differs from the previously described embodiment only by the type of attachment of the turns 12 of the transmitter device 5. In the lower and upper area of the frame is still attached about the spacers 14. In the side areas these are separated by two webs 38 running between the two groups 13a, 13b of turns 12, 39 replaced. With this construction, the stability of the Detector gate 4 reached against external influences. Optimize can the stability of the detector gate 4 by inserting a rod 40 a hard material in the space between the two webs 38, 39. FIGS. 14, 15 and 16 show those identified in FIG. 13 Cuts. All further details of the embodiment of the figures Fig. 13, Fig. 14, 15 and 16 correspond to those shown in the previous figures Details.

    BezugszeichenlisteReference list

    11
    DetektoreinrichtungDetector device
    22nd
    SicherungselementSecuring element
    33rd
    ÜberwachungszoneSurveillance zone
    44th
    DetektorgatterDetector gate
    55
    SendevorrichtungTransmitter
    66
    EmpfangsvorrichtungReceiving device
    77
    Energieversorgungpower supply
    88th
    Rechen-/AnsteuereinrichtungComputing / control device
    99
    AlarmeinrichtungAlarm device
    1010th
    äußerer Teilouter part
    1111
    innerer Teilinner part
    1212th
    WindungSwirl
    13a13a
    äußere Gruppeouter group
    13b13b
    innere Gruppeinner group
    1414
    AbstandhalterSpacers
    1515
    Lückegap
    1616
    Klappeflap
    1717th
    HalteelementHolding element
    1818th
    EmpfängerspuleReceiver coil
    1919th
    EmpfängerspuleReceiver coil
    2020th
    EmpfängerspuleReceiver coil
    2121
    Schleifeloop
    2222
    BodenhalterungFloor bracket
    2323
    vordere Rahmenhälftefront frame half
    2424th
    hintere Rahmenhälfterear frame half
    2525th
    Buzzerbuzzer
    2626
    BlinklichtFlashing light
    2727
    KederPiping
    2828
    Bohrungdrilling
    2929
    Schraubescrew
    3030th
    Freiraum free space
    3131
    Stegweb
    3232
    AusrichtemittelAlignment means
    3333
    Stiftpen
    3434
    transparente Kappetransparent cap
    3535
    KlemmelementClamping element
    3636
    Schraubescrew
    3737
    JustierschraubeAdjusting screw
    3838
    Stegweb
    3939
    Stegweb
    4040
    StabRod

    Claims (13)

    1. A device for detecting an article provided with an electronic security tag (2) in an interrogation zone (3), comprising at least one transmit device (5) emitting an alternating magnetic field causing the electronic security tag to deliver a characteristic signal, and at least one receive device (6) producing an alarm on receiving the characteristic signal, said transmit device (5) including a coil with several turns (12),
      characterized in that the turns (12) lie essentially in one plane, and that the turns (12) are subdivided into at least two groups (13a, 13b), said two groups (13a, 13b) being arranged at a distance (15) to each other.
    2. The device according to claim 1,
      characterized in that the turns (12) are arranged in a plane lying normal to the direction of passage through the interrogation zone (3).
    3. The device according to claim 1 or 2,
      characterized in that spacers (14) are provided which spatially separate the two groups (13a, 13b) of turns (12) from each other.
    4. The device according to claim 1,
      characterized in that two rib members (38, 39) forming a groove are provided between the two groups (13a, 13b) of turns (12).
    5. The device according to claim 4,
      characterized in that a rod (40) fabricated from a hard material is provided which is insertable into the groove formed between the two rib members (38, 39).
    6. The device according to claim 1 or 2,
      characterized in that the transmit device (5) and at least one receive device (6) are arranged in a detector antenna (4) forming a unit.
    7. The device according to claim 1 or 2,
      characterized in that the transmit device (5) and the receive device(s) (6) are arranged in separate detector antennas (4).
    8. The device according to claim 1 or 2,
      characterized in that the turns (12) of the coil of the transmit device (5) are fabricated from litz wire.
    9. The device according to claim 1 or 6,
      characterized in that the detector antenna (4) is comprised of an outer section (11) and an inner section (10), with the transmit device (5) being accommodated in the outer section (11) and the receive device(s) (6) preferably in the inner section (10) of the detector antenna (4).
    10. The device according to claim 1 or 9,
      characterized in that the receive device(s) (6) cover(s) a substantially smaller surface area than the transmit device (5).
    11. The device according to claim 10,
      characterized in that the receive device (6) includes at least one turn (12) bent such as to have essentially a quadrupole characteristic.
    12. The device according to claim 1,
      characterized in that the receive device (6) has the shape of a "figure of eight", with the two portions of the "figure of eight" being arranged side-by-side or one below the other.
    13. The device according to claim 1,
      characterized in that the electronic security tag (2) is an element fabricated from a soft magnetic material of high permeability and low coercive force, or that the material has magnetostrictive properties, or alternatively, that the security tag (2) is an element having a resonant circuit.
    EP96100686A 1995-02-07 1996-01-18 Detection device for an article with an electronic securing element Expired - Lifetime EP0726549B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19503896 1995-02-07
    DE19503896A DE19503896A1 (en) 1995-02-07 1995-02-07 Device for detecting an article provided with an electronic security element

    Publications (3)

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

    Family

    ID=7753312

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP96100686A Expired - Lifetime EP0726549B1 (en) 1995-02-07 1996-01-18 Detection device for an article with an electronic securing element

    Country Status (5)

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

    Families Citing this family (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE19722078A1 (en) * 1997-05-27 1998-12-03 Meto International Gmbh System for the surveillance of electromagnetically secured articles in several surveillance zones
    DE19726986A1 (en) * 1997-06-25 1999-01-07 Meto International Gmbh Device for the surveillance of electronically secured articles in a surveillance zone
    DE19732558A1 (en) * 1997-07-29 1999-02-04 Meto International Gmbh Method and device for winding a transmitting or receiving coil for an electronic article surveillance system
    DE19858714A1 (en) 1998-12-18 2000-06-21 Ebinger Klaus Ing Fa Gate probe

    Family Cites Families (11)

    * 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
    US4016553A (en) * 1975-06-27 1977-04-05 Knogo Corporation Article detection system with near field electromagnetic wave control
    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
    US4994939A (en) * 1989-11-15 1991-02-19 Minnesota Mining And Manufacturing Company Universal lattice for magnetic-electronic article surveillance system
    US5051726A (en) * 1990-08-14 1991-09-24 Sensormatic Electronics Corporation Electronic article surveillance system with antenna array for enhanced field falloff
    NL9100397A (en) * 1991-03-06 1992-10-01 Nedap Nv ASYMMETRICAL ANTENNA FOR SHOP THEFT DETECTION SYSTEMS.
    GB9125846D0 (en) * 1991-12-04 1992-02-05 Esselte Meto Int Gmbh Improved interrogation and detection means for theft-detection systems

    Also Published As

    Publication number Publication date
    AU4058295A (en) 1996-08-15
    ES2148599T3 (en) 2000-10-16
    DE59605082D1 (en) 2000-06-08
    DK0726549T3 (en) 2000-09-04
    AU695927B2 (en) 1998-08-27
    DE19503896A1 (en) 1996-08-08
    EP0726549A2 (en) 1996-08-14
    EP0726549A3 (en) 1996-11-06

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