EP1034520B1 - System zur sicherung von artikeln gegen diebstahl - Google Patents
System zur sicherung von artikeln gegen diebstahl Download PDFInfo
- Publication number
- EP1034520B1 EP1034520B1 EP98962321A EP98962321A EP1034520B1 EP 1034520 B1 EP1034520 B1 EP 1034520B1 EP 98962321 A EP98962321 A EP 98962321A EP 98962321 A EP98962321 A EP 98962321A EP 1034520 B1 EP1034520 B1 EP 1034520B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- transmission device
- transmitter
- transmission
- alternating
- transmitting
- 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
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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 system for securing articles against theft, the are equipped with an electronic security element, with at least a first transmission device, the first magnetic in an interrogation zone Alternating field emitted, which the electronic fuse element for Emits a characteristic signal, and with at least one Receiving device that triggers an alarm as soon as it has a characteristic Signal received.
- Thin-film labels consist of a thin layer of soft magnetic material, preferably in the ⁇ m range. The layer is applied to a carrier substrate, for example by means of a physical deposition process under vacuum conditions. Thin-film labels have an anisotropic structure. Anisotropic means that the soft magnetic layer from which the thin-film labels are formed has a preferred axis.
- the anisotropic structure is noticeable in that the characteristic signal remitted by the thin-film label in response to a query field is at a maximum if the query field and the preferred axis are aligned parallel to one another; the signal disappears, however, if the preferred axis and the query field are perpendicular to each other.
- strip security elements which are made of, also show an analogous behavior a strip-shaped, soft magnetic material. This is also here characteristic signal maximum when the query field and stripes are parallel are aligned with each other and it disappears when aligned vertically.
- a strip securing element can also be made from a drawn wire consist.
- a large number of different methods have become known for detecting security elements in an interrogation zone.
- These devices include transmitter and receiver devices that are arranged to generate a horizontal magnetic field (parallel to the ground).
- the transmission devices in particular often consist of different transmission coils, the transmission coils of a transmission device normally being connected in parallel or in series.
- the customers cross the magnetic field of the transmitting device, moving orthogonally to it.
- Various devices and methods have been described to improve the detection rates achieved by the described transmission and reception devices.
- US-A-3 838 409 which, however, relates exclusively to the detection of fuse elements with electrical resonant circuits, proposes a further transmitting coil in addition to the aforementioned transmitting and receiving devices, which generates a further horizontal magnetic field.
- This second magnetic field is orthogonal to the first and thus parallel to the direction of travel of the customers who cross the magnetic field of the second transmitter coil when they leave the department store.
- the current that generates the first magnetic field has a phase difference of 90 ° compared to the current that causes the second magnetic field.
- EP 123 586 B proposes sending, in addition to two query fields with the frequencies f1 and f2 in the kHz range, a field with a frequency in the Hz range into the query zone.
- the low-frequency interrogation field causes the securing element to be driven from saturation in one direction to saturation in the other direction in time with this field.
- the characteristic signal therefore occurs periodically with the frequency of the low-frequency field.
- EP 0 611 164 A2 describes a method and a corresponding one Device described, which are based on a 2-frequency detection.
- the invention has for its object a device with an improved To create detection rate in the floor area.
- the object is achieved in that a second transmitter in Floor area of the query zone a second magnetic alternating field is provided to approximate the detection rate in the near ground area emitted into the interrogation zone, the second transmitter essentially is aligned perpendicular to the first transmission device.
- the system Since the detection rate of the second transmitting device in the near the floor, the system is mainly used in Exit / entrance area of shoe stores are used. In however, the second transmitter can be used in corresponding applications also be arranged in the ceiling area.
- the second transmission device is composed of at least two transmission coils which are arranged next to one another at a predetermined distance.
- the first transmission device consists of two transmission antennas arranged at a predetermined distance from one another and that the transmission coils of the second transmission device are each connected in series with the transmission antenna of the first transmission device, which has the greater distance from it .
- the transmitting devices advantageously emit alternating magnetic fields different frequencies in the interrogation zone, the frequency being one of the
- Alternating fields is located in the low frequency range. This arrangement thus corresponds to the monitoring device described in EP 0 123 586 is described. According to an alternative, this is with a low frequency of e.g. 16 Hz in the surveillance zone emitted alternating magnetic field to the corresponding alternating field the transmitting antenna (s) of the first transmitting device in phase opposition.
- a low frequency e.g. 16 Hz
- the surveillance zone emitted alternating magnetic field to the corresponding alternating field the transmitting antenna (s) of the first transmitting device in phase opposition.
- the resulting field-free areas which are in this arrangement in the floor area are shown in Fig. 1.
- a preferred development of the system according to the invention provides that the second transmitter device consisting of four transmitter coils or two pairs of transmitter coils exists, the two transmitter coils of a pair each offset from one another are arranged like a checkerboard in two successive levels. By this configuration allows the detection rate in the floor area or in Considerably increase the ceiling area again.
- pairs of transmitter coils each have the transmitting antenna of the first transmitting device is connected in series, which has the greater distance from it.
- the pairs of transmission coils of the second transmission device are preferably switched to the transmission antennas of the first transmission device a control / evaluation unit.
- the second is to make installation in the floor or ceiling easier Transmitting device designed as a compact unit.
- the transmitter coils of the second transmitter are installed in corresponding recesses in one Mounting plate inserted.
- Interference radiation entering the interrogation zone from outside has a negative effect the detection rate.
- a shielding plate is preferably made of aluminum.
- the second transmission device is arranged in the floor area them in the upper area with a coating of a resistant Provide material.
- Fig. 1 and Fig. 2 is a first embodiment of the System according to the invention can be seen in a perspective view.
- the two Transmitting / receiving devices 3, 4 are at a predetermined distance arranged from each other.
- In the floor area between the two transmitting / receiving devices 3, 4 are in addition to the transmission antennas 11, 12 of the first Transmitting devices 3 two adjacent transmission coils 7, 8 of a second transmitting device 6 intended.
- These transmission coils 7, 8 emit like the transmission antennas 11, 12 of the first transmission devices 3 magnetic alternating fields with preferably three different frequencies: a low frequency of e.g. 16 Hz and two Radio frequencies in the kilo-Hertz range.
- the left transmitter coil 7 is on the right Transmitting antenna 12 connected in series, and the right transmitting coil 8 is in series switched with the left transmitting antenna 11.
- FIGS. 1 and 2 18 The distribution of the field-free areas is also shown in FIGS. 1 and 2 18 visualized near the floor of query zone 5.
- the differences in the Field distribution stems from the fact that in the case of FIG. 1 the current that the low-frequency fields in the transmission coils 7, 8 of the second transmission device 6 and in the transmission antennas 11, 12 of the first transmission device 3 is generated, is in phase opposition, whereas in the case of FIG. 2 it is in the transmission coils 7, 8 and the transmitting antennas 11, 12, is in phase.
- FIG. 3 shows a third preferred embodiment of the invention Systems in perspective view.
- the query zone 5 by the two at a predetermined distance arranged transmitting / receiving devices 3, 4 defined.
- the floor area are in addition to the two laterally arranged transmission antennas 11, 12 now four transmitter coils 7, 8, 9, 10 are provided, which are checkerboard-like are arranged.
- the arrangement of the transmitter coils 7, 8, 9, 10 of the second Transmitting device 6 is shown in detail in the top view of FIG. 3a.
- the two left transmission coils 7, 9 are in with the right transmission antenna 12 of the first transmission device 3 Series connected; the two right transmitter coils 8, 10 are serial with the left Transmitting antenna 11 of the first transmitting device 3 connected. This arrangement provides an excellent one Detection rate in the floor area.
- FIG. 4 shows a schematic representation of the system according to the invention, consisting of the arranged on both sides of the query zone 5 Transmitting antennas 11, 12 of the first transmitting device 3 and the second transmitting device 6 in the floor area.
- the Transmitting coils 7, 8, 9, 10 of the second transmitting device 6 are again arranged like a checkerboard.
- the circuit of the transmitter coils 7, 8, 9, 10 and Transmitting antennas 11, 12 are carried out just like the evaluation of the received signals via an electronic control / evaluation unit 13. With this control / evaluation unit for example, it is an EM3 + electronics that is distributed by the applicant.
- the second transmission device 6 is, as in FIG. 5 shown, a receiving plate 15 with recesses 14 for the transmitter coils 7, 8, 9, 10 provided.
- the second transmission device 6 is thus a compact unit designed, which is fixed in the floor or on the bottom of the query zone 5.
- the radiation of the high-frequency fields from the interrogation zone 5 in the To prevent floor area and on the other hand to avoid the from the floor area radiated radio frequency fields (e.g. from electrical cables) keep away from the interrogation zone is on the underside of the transmission coils 7, 8, 9, 10 receiving receiving plate 15, a shielding plate 16 is arranged. According to a preferred embodiment, this is made of aluminum.
- the second transmission device 6 is in the passage area Department store or warehouse arranged - it is made with a coating 17 resistant material.
- the construction of an embodiment of the Incidentally, the second transmission device 6 is in the cross section shown in FIG. 6 (along the line VI-VI in Fig. 5).
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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)
Abstract
Description
Dünnschicht-Etiketten beschrieben, welche aus einer dünnen, vorzugsweise im µm-Bereich liegenden Schicht aus weichmagnetischem Material bestehen. Die Schicht wird z.B. mittels eines physikalischen Abscheideverfahrens unter Vakuumbedingungen auf ein Trägersubstrat aufgebracht.
Dünnschicht-Etiketten zeigen einen anisotropen Aufbau. Anisotrop bedeutet, daß die weichmagnetische Schicht, aus der die Dünnschicht-Etiketten gebildet sind, eine Vorzugsachse besitzt. Der anisotrope Aufbau macht sich in der Praxis dadurch bemerkbar, daß das von dem Dünnschicht-Etikett als Antwort auf ein Abfragefeld remittierte charakteristische Signal maximal ist, wenn Abfragefeld und Vorzugsachse parallel zueinander ausgerichtet sind; das Signal verschwindet hingegen, wenn Vorzugsachse und Abfragefeld senkrecht zueinander stehen.
Zur Verbesserung der Detektionsquoten, die von den beschriebenen Sende- und Empfangsvorrichtungen erreicht werden, sind verschiedene Vorrichtungen und Verfahren beschrieben worden.
So schlägt die US-A-3 838 409, die sich allerdings ausschließlich auf die Detektion von Sicherungselementen mit elektrischen Schwingkreisen bezieht, neben den vorgenannten Sende- und Empfangesvorrichtungen eine weitere Sendespule vor, die ein weiteres horizontales Magnetfeld erzeugt. Dieses zweite Magnetfeld verläuft orthogonal zu dem ersten und damit parallel zur Fortbewegungsrichtung der Kunden, die beim Verlassen des Kaufhauses das Magnetfeld der zweiten Sendespule durchqueren. Um die feldfreien Flächen im geometrischen Zentrum der Überwachungszone, die ein Kunde beim Durchqueren der Magnetfelder durchläuft, zu reduzieren, besitzt der Strom, der das erste Magnetfeld erzeugt, eine Phasendifferenz von 90° gegenüber dem Strom, der das zweite Magnetfeld hervorruft.
In der EP 123 586 B wird vorgeschlagen, zusätzlich zu zwei Abfragefeldern mit den Frequenzen f1 und f2 im kHz-Bereich ein Feld mit einer im Hz-Bereich liegenden Frequenz in die Abfragezone zu senden. Die beiden Abfragefelder mit den Frequenzen f1 und f2 regen ein in der Überwachungszone befindliches Sicherungselement zur Aussendung eines charakteristischen Signals mit den
Intermodulationsfrequenzen n×f1 ± m×f2 (n, m = 0, 1, 2,...) an. Das niederfrequente Abfragefeld bewirkt, daß das Sicherungselement im Takt dieses Feldes von der Sättigung in eine Richtung zur Sättigung in die andere Richtung getrieben wird. Das charakteristische Signal tritt daher periodisch mit der Frequenz des niederfrequenten Feldes auf.
In diesem Zusammenhang wird gemäß einer günstigen Ausführungsform vorgeschlagen, daß die erste Sendevorrichtung aus zwei in einem vorgegebenen Abstand zueinander angeordneten Sendeantennen besteht und daß die Sendespulen der zweiten Sendevorrichtung jeweils in Reihe mit der Sendeantenne der ersten Sendevorrichtung geschaltet ist, die von ihr den größeren Abstand hat. Es ist hierzu anzumerken, dass die Begriffe "Sendespule" und "Sendeantenne" grundsätzlich synonym verwendet werden können, da auch eine "Sendeantenne" aus "Sendespulen" besteht. Die unterschiedlichen Begriffe werden hier verwendet, um die "Sendespulen" der zweiten Sendevorrichtung besser von den Sendespulen (= "Sendeantennen") der ersten Sendevorrichtung unterscheiden in können.
- 1
- Artikel
- 2
- Sicherungselement
- 3
- erste Sendevorrichtung
- 4
- Empfangsvorrichtung
- 5
- Abfragezone
- 6
- zweite Sendevorrichtung
- 7
- Sendespule
- 8
- Sendespule
- 9
- Sendespule
- 10
- Sendespule
- 11
- Sendeantenne
- 12
- Sendeantenne
- 13
- Regel-/Auswerteeinheit
- 14
- Ausnehmung
- 15
- Aufnahmeplatte
- 16
- Abschirmplatte
- 17
- Beschichtung
- 18
- Feldfreier Bereich
Claims (11)
- System zur Sicherung von Artikeln (1) gegen Diebstahl, die mit einem elektronischen Sicherungselement (2) ausgestattet sind, mit mindestens einer ersten Sendevorrichtung (3), die in eine Abfragezone ein erstes magnetisches Wechselfeld emittiert, welches das elektronische Sicherungselement zur Aussendung eines charakteristischen Signals anregt, und mit mindestens einer Empfangsvorrichtung (4), die einen Alarm auslöst, sobald sie das charakteristische Signal identifiziert,
dadurch gekennzeichnet, daß eine zweite Sendevorrichtung (6) im Bodenbereich der Abfragezone (5) zur Erhöhung der Detektionsrate im nahen Bodenbereich vorgesehen ist, die ein zweites magnetisches Wechselfeld in die Abfragezone (5) emittiert, wobei die erste Sendevorrichtung (3) im wesentlichen senkrecht zu der zweiten Sendevorrichtung (6) ausgerichtet ist. - System nach Anspruch 1,
dadurch gekennzeichnet, daß die zweite Sendevorrichtung (6) aus zumindest zwei Sendespulen (7, 8) besteht, die in einem vorgegebenen Abstand nebeneinander angeordnet sind. - System nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die erste Sendevorrichtung (3) aus zwei in einem vorgegebenen Abstand zueinander angeordneten Sendeantennen (11, 12) besteht und
daß die Sendespulen (7; 8) der zweiten Sendevorrichtung (6) jeweils in Reihe mit der Sendeantenne (12, 11) der ersten Sendevorrichtung (3) geschaltet ist, die von ihr den größeren Abstand hat. - System nach Anspruch 3,
dadurch gekennzeichnet, daß die Sendevorrichtungen (3, 6) magnetische Wechselfelder unterschiedlicher Frequenzen in die Abfragezone (5) emittieren, wobei die Frequenz eines der Wechselfelder im Niederfrequenzbereich angesiedelt ist und wobei
dieses im Niederfrequenz bereich angesiedelte wechselfeld mit dem entsprechenden Wechselfeld der Sendeantenne(n) (11, 12) der ersten Sendevorrichtung (3) in Phase ist. - System nach Anspruch 3,
dadurch gekennzeichnet, daß die Sendevorrichtungen (3, 6) magnetische Wechselfelder unterschiedlicher Frequenzen in die Abfragezone (5) emittieren, wobei eines der Wechselfelder im Niederfrequenzbereich angesiedelt und
zu dem entsprechenden Wechselfeld der Sendeantenne(n) (11, 12) der ersten Sendevorrichtung (3) gegenphasig ist. - System nach Anspruch 1,
dadurch gekennzeichnet, daß die zweite Sendevorrichtung (6) aus vier Sendespulen (7, 8, 9, 10) oder zwei Paar Sendespulen (7, 9; 8, 10) besteht, wobei die beiden Sendespulen eines Paares (7, 9; 8, 10) der zweiten Sendvorrichtung (6) jeweils versetzt zueinander in zwei aufeinanderfolgenden Ebenen schachbrettartig angeordnet sind. - System nach Anspruch 6,
dadurch gekennzeichnet, daß ein Paar Sendespulen (7, 9; 8, 10) der zweiten Sendevorrichtung (6) jeweils mit der Sendeantenne (12; 11) der ersten Sendevorrichtung (3) in Reihe geschaltet ist, die von ihm den größeren Abstand hat. - System nach Anspruch 7,
dadurch gekennzeichnet, daß die Schaltung der Paare von Sendespulen (7, 9; 8, 10) der zweiten Sendevorrichtung (6) zu den Sendeantennen (12, 11) der ersten Sendevorrichtung (13) über eine Regel-/Auswerteeinheit (13) erfolgt. - System nach Anspruch 2 oder 6,
dadurch gekennzeichnet, daß die zweite Sendevorrichtung (6) als kompakte Einheit ausgebildet ist und
daß die Sendespulen (7, 8, 9, 10) derselben in entsprechend vorgesehene Ausnehmungen (14) einer Aufnahmeplatte (15) eingelegt sind. - System nach Anspruch 9,
dadurch gekennzeichnet, daß im unteren Bereich der zweiten Sendevorrichtung (6) eine Abschirmplatte (16) vorgesehen ist. - System nach Anspruch 10,
dadurch gekennzeichnet, daß die Oberseite der zweiten Sendevorrichtung (6) mit einer Beschichtung (17) aus einem widerstandsfähigen Material versehen ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19752506 | 1997-11-27 | ||
DE19752506A DE19752506A1 (de) | 1997-11-27 | 1997-11-27 | System zur Sicherung von Artikeln gegen Diebstahl |
PCT/EP1998/007043 WO1999028878A1 (de) | 1997-11-27 | 1998-11-04 | System zur sicherung von artikeln gegen diebstahl |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1034520A1 EP1034520A1 (de) | 2000-09-13 |
EP1034520B1 true EP1034520B1 (de) | 2003-01-22 |
Family
ID=7849938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98962321A Expired - Lifetime EP1034520B1 (de) | 1997-11-27 | 1998-11-04 | System zur sicherung von artikeln gegen diebstahl |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1034520B1 (de) |
AU (1) | AU1753799A (de) |
DE (2) | DE19752506A1 (de) |
WO (1) | WO1999028878A1 (de) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3838409A (en) * | 1973-04-13 | 1974-09-24 | Knogo Corp | Field strength uniformity control system for article theft detection system |
US3938125A (en) * | 1974-02-20 | 1976-02-10 | Minnesota Mining And Manufacturing Company | Antipilferage system and marker therefor |
GB1582616A (en) * | 1977-04-29 | 1981-01-14 | Lord Corp | Liquid filled flexible conduit joint |
EP0123586B1 (de) * | 1983-03-25 | 1988-06-01 | FAIRCHILD CAMERA & INSTRUMENT CORPORATION | Treiberschaltung mit drei möglichen Ausgangszuständen für eine automatische Testeinrichtung |
US5121103A (en) * | 1988-07-29 | 1992-06-09 | Knogo Corporation | Load isolated article surveillance system and antenna assembly |
GB9302757D0 (en) * | 1993-02-11 | 1993-03-24 | Esselte Meto Int Gmbh | Method and system for detecting a marker |
US5406262A (en) * | 1993-06-16 | 1995-04-11 | Security Tag Systems, Inc. | Adjusting magnetic bias field intensity in EAS presence detection system to enhance detection |
-
1997
- 1997-11-27 DE DE19752506A patent/DE19752506A1/de not_active Withdrawn
-
1998
- 1998-11-04 WO PCT/EP1998/007043 patent/WO1999028878A1/de active IP Right Grant
- 1998-11-04 EP EP98962321A patent/EP1034520B1/de not_active Expired - Lifetime
- 1998-11-04 DE DE59807033T patent/DE59807033D1/de not_active Expired - Fee Related
- 1998-11-04 AU AU17537/99A patent/AU1753799A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
DE19752506A1 (de) | 1999-06-02 |
AU1753799A (en) | 1999-06-16 |
WO1999028878A1 (de) | 1999-06-10 |
DE59807033D1 (de) | 2003-02-27 |
EP1034520A1 (de) | 2000-09-13 |
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