EP0951000A2 - Dispositif pour désactiver un élément de sécurité pour la protection électronique d'articles - Google Patents

Dispositif pour désactiver un élément de sécurité pour la protection électronique d'articles Download PDF

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Publication number
EP0951000A2
EP0951000A2 EP98123424A EP98123424A EP0951000A2 EP 0951000 A2 EP0951000 A2 EP 0951000A2 EP 98123424 A EP98123424 A EP 98123424A EP 98123424 A EP98123424 A EP 98123424A EP 0951000 A2 EP0951000 A2 EP 0951000A2
Authority
EP
European Patent Office
Prior art keywords
magnet
opening
magnetic field
field lines
magnetic material
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.)
Withdrawn
Application number
EP98123424A
Other languages
German (de)
English (en)
Other versions
EP0951000A3 (fr
Inventor
Manfred Dr. Rührig
Michael Rapp
Peter Bremer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meto International GmbH
Original Assignee
Meto International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19831415A external-priority patent/DE19831415A1/de
Application filed by Meto International GmbH filed Critical Meto International GmbH
Publication of EP0951000A2 publication Critical patent/EP0951000A2/fr
Publication of EP0951000A3 publication Critical patent/EP0951000A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2408—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using ferromagnetic tags
    • G08B13/2411—Tag deactivation

Definitions

  • the invention relates to a device for deactivating a securing element for electronic article surveillance, the securing element a magnetic material with high permeability and low coercive force (soft magnetic material) and a magnetic material with less Permeability and high coercivity (semi-hard or hard magnetic Material), the soft magnetic material by applying a magnetic alternating field in an interrogation zone for the remission of a characteristic signal is excited and being the characteristic Signal is suppressed when the semi-hard or hard magnetic material after applying a correspondingly high magnetic field in a retentive Magnetization state is.
  • Securing elements of the type described above are - as already said - preferably in the area of electronic article surveillance in department stores and bearings used.
  • a particularly advantageous embodiment of a Securing element has become known from EP 0 295 028 B1.
  • the so-called thin-film sealing elements are described in the patent. This consist of a thin layer, preferably in the ⁇ m range made of soft magnetic material. The layer is e.g. B. by means of a physical deposition process under vacuum conditions Carrier substrate applied.
  • Thin-film fuse elements show an anisotropic structure.
  • Anisotropic means the soft magnetic layer from which the thin film fuse elements are formed, has a preferred axis.
  • the anisotropic In practice, structure is noticeable in that the of the Thin film fuse element returned in response to a query field characteristic signal is maximum if query field and preferred axis are aligned parallel to each other; however, the signal disappears when Preferred axis and query field are perpendicular to each other.
  • strip elements which consist of 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 disappears when aligned vertically.
  • the strip element can also be made of drawn wire consist.
  • a perforated film from a semi-hard magnetic material, such as nickel, is provided.
  • At Strip elements are sections of a semi-hard or hard magnetic Material arranged in the immediate vicinity of the soft magnetic strip.
  • the magnetized deactivation material generates a Stray field that premagnetizes the soft magnetic material so that it is no longer detected in the query zone.
  • the deactivation material is converted into a defined magnetization state (remanence), which maximum magnetization and thus a maximum stray field guaranteed.
  • the invention has for its object to propose a device that a reliable deactivation of a safety element for electronic Article security over a greater distance allowed.
  • the object is achieved in that at least one magnet is provided, that at least one deflection device for the magnetic field lines of the magnet between the fuse element to be deactivated and the magnet is provided and that in the deflection device for the magnetic field lines of A substantially linear opening is provided through magnets the magnetic field lines of the magnetic field of the magnet emerge in bundles.
  • the opening in the deflection device for the magnetic field lines of the magnet has the shape of a triangle in cross section, the magnetic field lines emerging through the corner opposite the base side.
  • the opening in the deflection device for the magnetic field lines of the magnet has the shape of an isosceles triangle in cross section.
  • the magnet is preferably a permanent magnet.
  • An alternative embodiment proposes an electromagnet.
  • the device according to the invention is the deflection device for the magnetic field lines of the magnet around at least one soft magnetic Metal plate.
  • the metal plate or exist Metal plates made of iron.
  • a permanent magnet is used as the magnet, it preferably has the shape of a cuboid with different side lengths.
  • the opening faced one of the larger side surfaces is arranged or that the opening parallel to one of the larger Side surfaces is arranged.
  • the opening is outside the corresponding side surface provided, but at least it is off-center to one of the two larger side surfaces.
  • the asymmetrical arrangement of the Opening causes the magnetic field after leaving the maximum values, achieved above the opening no longer changes direction.
  • a further magnet is arranged behind the first magnet, this further magnet essentially generating a vertical field component. This significantly improves the deactivation properties of the device according to the invention in the near field. In particular, it is ensured that the magnetic field generated by the device no longer changes its sign along the direction of movement (x) of the securing element after passing through the maximum value of the field as soon as the amount has once dropped below a certain threshold value.
  • an alternative embodiment of the device according to the invention provides that the opening is arranged opposite one of the smaller side surfaces of the cuboid permanent magnet.
  • the opening is preferably arranged centrally to one of the smaller side surfaces.
  • the opening extends over the entire side length of the corresponding side surface of the magnet.
  • the device according to the invention is a compact part that can be easily integrated into a checkout point of a department store.
  • the device is arranged under the feed belt for the goods, the opening being oriented parallel to the feed belt but perpendicular to its running direction.
  • the security elements are deactivated while the goods are being transported on the conveyor belt to the cash register.
  • two devices according to the invention are arranged so that the corresponding Openings are substantially perpendicular to each other and that the Openings lie essentially in one plane.
  • the devices can be integrated in the area of a cash desk, for example, so that the Article security elements are deactivated as soon as or shortly before the corresponding item price registered for proper payment becomes.
  • the first device preferably has an asymmetrical field distribution, while the second device has a symmetrical field distribution having.
  • Figures 1 and 2 show a first embodiment of the Device 1 according to the invention in perspective view.
  • Two magnetically conductive metal plates 3, 4, which are preferably made of iron are bevelled on the opposite edges.
  • the Bevels with respect to the base pages, i.e. the undersides of the Metal plates 3, 4 is preferably 45 °. So that the opening 5 between the two metal plates 3, 4 in cross section the shape of an isosceles Triangular.
  • the opening 5 itself is arranged in the corner, that of the base side of the isosceles triangle.
  • the width of the opening 5 is preferably in the mm range.
  • the two metal plates 3, 4 leave one of the both side surfaces (a x b) and the two side surfaces (a x c) free.
  • Permanent magnet 2 is provided, which is positioned so that it is parallel to the linear opening 5, but outside the opening 5 between the Metal plates 3, 4 is arranged.
  • the opening 5 is covered by a magnetically non-conductive plate 6, which is preferably made of aluminum or Plastic is made.
  • the cover plate 6 serves to lock the invention Device 1 in the area of the cash desk.
  • Fig. 3 the distribution of the x component of the magnetic field is above that in Fig. 1 and Fig. 2 embodiment shown in longitudinal section (labeling III-III).
  • the deflection device in the case shown by the two metal plates 3, 4 with the opening 5, the magnetic field lines occur bundled out.
  • the magnetic field above the opening 5 is therefore maximum.
  • FIG. 4 shows a further embodiment of the device according to the invention 1 in perspective view; 5 is a cross section through that in FIG. 4 shown embodiment shown according to the label V-V.
  • the opening 5 is between the two metal plates 3, 4 parallel and centered on one of the smaller side faces of the cuboid Permanent magnet 2 arranged.
  • both metal plates 3, 4 are on the opposite edges beveled so that the opening 5 forms the shape of an isosceles triangle.
  • the linear opening 5, through which the magnetic field lines emerge into the outside is again only a few millimeters wide.
  • FIG. 6 shows one corresponding to the FIGS. 2 and 3 Embodiment, but here the permanent magnet 2 of the figures Fig. 2 and Fig. 3 by an electromagnet 7 - one on a core wound coil - is replaced.
  • FIG. 7 shows an embodiment analogous to FIG. 4 shown, again instead of one or more Permanent magnets 2 an electromagnet 7 (or several electromagnets 7) is used.
  • Fig. 7 shows a schematic representation of an embodiment of the device according to the invention also with an electromagnet.
  • FIG. 8 is a perspective view of a preferred combination of two Devices 1 according to the invention shown.
  • both devices 1 according to one preferred embodiment arranged in the area of a cash desk. While one of the two devices 1 has an asymmetrical field distribution has, the other device 1 is characterized by a symmetrical Field distribution.
  • the openings 5 of the arranged perpendicular to each other Devices 1 lie essentially in one plane. Through the shown The intensity of the magnetic field is arranged in particular in the area between the two devices 1 significantly increased without a Change of direction of the field occurs.
  • the securing element 9 shows a preferred embodiment of the device according to the invention.
  • the securing element 9 is in the direction of movement x guided over the device according to the invention.
  • that the securing element 9 is subsequently reactivated is behind the Opening 5 another magnet 11 is arranged.
  • This magnet 11 is like this positions that the magnetic field generated by it is essentially a Component has an angle with the normal to the plane of the Cover plate 6 forms. It is also possible to arrange the magnet 11 in such a way that it is essentially a component in the direction of the normal to the plane the cover plate 6 generated.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
EP98123424A 1998-04-17 1998-12-09 Dispositif pour désactiver un élément de sécurité pour la protection électronique d'articles Withdrawn EP0951000A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19816958 1998-04-17
DE19816958 1998-04-17
DE19831415 1998-07-14
DE19831415A DE19831415A1 (de) 1998-04-17 1998-07-14 Vorrichtung zum Deaktivieren eines Sicherungselementes für die elektronische Artikelsicherung

Publications (2)

Publication Number Publication Date
EP0951000A2 true EP0951000A2 (fr) 1999-10-20
EP0951000A3 EP0951000A3 (fr) 2000-06-21

Family

ID=26045538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98123424A Withdrawn EP0951000A3 (fr) 1998-04-17 1998-12-09 Dispositif pour désactiver un élément de sécurité pour la protection électronique d'articles

Country Status (1)

Country Link
EP (1) EP0951000A3 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0129335A1 (fr) * 1983-05-20 1984-12-27 Minnesota Mining And Manufacturing Company Désensibilisation d'un marqueur ferromagnétique dans un système de surveillance électromagnétique pour articles
EP0431745A2 (fr) * 1989-12-08 1991-06-12 Minnesota Mining And Manufacturing Company Sensibilisateur pour étiquettes ferromagnétiques utilisées avec des systèmes électromagnétiques de surveillance d'articles
EP0585891A1 (fr) * 1992-09-03 1994-03-09 Minnesota Mining And Manufacturing Company Dispositif de désensibilisation pour un système électromagnétique de surveillance d'articles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0129335A1 (fr) * 1983-05-20 1984-12-27 Minnesota Mining And Manufacturing Company Désensibilisation d'un marqueur ferromagnétique dans un système de surveillance électromagnétique pour articles
EP0431745A2 (fr) * 1989-12-08 1991-06-12 Minnesota Mining And Manufacturing Company Sensibilisateur pour étiquettes ferromagnétiques utilisées avec des systèmes électromagnétiques de surveillance d'articles
EP0585891A1 (fr) * 1992-09-03 1994-03-09 Minnesota Mining And Manufacturing Company Dispositif de désensibilisation pour un système électromagnétique de surveillance d'articles

Also Published As

Publication number Publication date
EP0951000A3 (fr) 2000-06-21

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