EP0944885A1 - Etiquette pour systemes antivol acousto-magnetiques - Google Patents

Etiquette pour systemes antivol acousto-magnetiques

Info

Publication number
EP0944885A1
EP0944885A1 EP97952717A EP97952717A EP0944885A1 EP 0944885 A1 EP0944885 A1 EP 0944885A1 EP 97952717 A EP97952717 A EP 97952717A EP 97952717 A EP97952717 A EP 97952717A EP 0944885 A1 EP0944885 A1 EP 0944885A1
Authority
EP
European Patent Office
Prior art keywords
strip
label according
label
hard
semi
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97952717A
Other languages
German (de)
English (en)
Other versions
EP0944885B1 (fr
Inventor
Kurt Emmerich
Giselher Herzer
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0944885A1 publication Critical patent/EP0944885A1/fr
Application granted granted Critical
Publication of EP0944885B1 publication Critical patent/EP0944885B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15316—Amorphous metallic alloys, e.g. glassy metals based on Co
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension

Definitions

  • amorphous strip as a resonator and a magnetically semi-hard strip arranged in parallel to adjust the resonance frequency.
  • These magnetoelastic strips usually contain surveillance strips, which are made of a preferably amorphous alloy with high
  • Magnetostriction exist and are mechanically freely movable in a label.
  • These amorphous alloys are based e.g. on alloy systems which also contain Ni in addition to Fe (WO 90/03652), or which also contain Ni and Co in addition to Fe (utility model G94 12 456.6) and which are excited by longitudinal excitation with an alternating field pulse to produce longitudinal, mechanical resonance vibrations. Due to the magnetostrictive coupling, the mechanical stresses linked to the vibration cause a change in magnetization, which induces a corresponding alternating voltage in the receiver coil, with which the label can be verified.
  • the characteristic of the label is the resonance frequency of the amorphous strip, which, in addition to the length of the label, also depends on the DC field magnetization of the parallel magnetically hard strip.
  • the tuning of the length of the amorphous strip to the flux of the magnetized, semi-hard strip determines the resonance frequency of the label in the activated state. This resonance frequency must clearly differ from the resonance frequency of the amorphous strip with or without
  • amorphous strips and magnetically semi-hard strips are produced separately and the properties are matched separately for both strips. Accordingly, the criteria for the strips used are very critical in terms of their properties and in particular the deviations in the properties within large run lengths and lead to unsatisfactory output values in the entire process.
  • the labels are shown with freely oscillating amorphous strips, so that the label length corresponds exactly to half the wavelength of the resonance frequency.
  • the width of the strips can only be reduced to a limited extent at the resonance frequency specified by the system.
  • the invention relates to the manufacture and design of labels for use in goods security and identification systems in which the magnetoelastic surveillance strip is fixed on one side and is excited in the system to oscillate with a 1/4 wavelength of the resonance frequency. Furthermore, the invention relates to the comparison of the properties of the label during manufacture, so that, compared to the prior art, a significant reduction in the requirements for the strips used (preferably amorphous and magnetically semi-hard) can be achieved.
  • An amorphous strip made of VITROVAC 7250 (Fe-Co-Ni-Si-BC) with a width of 6 mm and a thickness of 25 ⁇ m is attached to this magnetically semi-hard SEMIVAC 90 by spot welding, whereby in the amorphous strip by heat treatment in the field a linear magnetization curve, a defined magnetostriction (this results in the magnetoelastic resonance behavior) and a transverse curvature.
  • the spot weld fixings consist of one or more weld spots next to each other, each of which fix the amorphous strip on the SEMIVAC 90 at a distance of exactly 23 mm.
  • the magnetically semi-hard strip is magnetized and the resonance frequency of the amorphous strip is measured.
  • the exact positioning of the punch holes to the following spot welds is calculated from the measured resonance frequency, so that a close tolerance of the resonance frequency (e.g. 58 kHz ⁇ 100 Hz) can also be achieved with larger standard deviations of both strips, provided that the variation of the properties exceeds Lengths occurs, which is long compared to the label length (approx. 20 mm).
  • flux changes of the magnetic semi-hard strip of ⁇ 20% could be compensated for, while with conventional labels ⁇ 5% already lead to problems in production.
  • the label production is completed by placing a plastic pro filmaschine, which protects the free-swinging end of the amorphous strip against mechanical manipulation in use.
  • a further embodiment of the labels according to the invention replaces the spot welding process by applying transversely glued double-sided adhesive strips which, in accordance with the spot welds, ensure the amorphous strip is fixed at uniform intervals.
  • the further manufacturing process proceeds analogously.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Burglar Alarm Systems (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

La présente invention concerne l'utilisation d'une étiquette à excitation magnéto-élastique dans des systèmes de surveillance et d'identification. Cette étiquette est constituée d'une bande magnétique semi-solide de désactivation et, de préférence, d'une bande amorphe à fonction de résonateur. Le résonateur est fixé d'un côté et l'oscillation de résonnance stimulée avec un quart de longueur d'onde.
EP97952717A 1996-12-11 1997-12-11 Etiquette pour systemes antivol acousto-magnetiques Expired - Lifetime EP0944885B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19651525A DE19651525A1 (de) 1996-12-11 1996-12-11 Etiketten in akustomagnetischen Diebstahlsicherungssystemen
DE19651525 1996-12-11
PCT/DE1997/002893 WO1998026390A1 (fr) 1996-12-11 1997-12-11 Etiquette pour systemes antivol acousto-magnetiques

Publications (2)

Publication Number Publication Date
EP0944885A1 true EP0944885A1 (fr) 1999-09-29
EP0944885B1 EP0944885B1 (fr) 2002-09-18

Family

ID=7814384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97952717A Expired - Lifetime EP0944885B1 (fr) 1996-12-11 1997-12-11 Etiquette pour systemes antivol acousto-magnetiques

Country Status (5)

Country Link
US (1) US6171694B1 (fr)
EP (1) EP0944885B1 (fr)
JP (1) JP2001506025A (fr)
DE (2) DE19651525A1 (fr)
WO (1) WO1998026390A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19953334C2 (de) 1999-11-05 2002-05-08 Siemens Ag Fernauslesbare Identifikationsmarke und Verfahren zum Betrieb mehrerer solcher Identifikationsmarken
WO2010082195A1 (fr) 2009-01-13 2010-07-22 Vladimir Manov Marqueurs magnétomécaniques et élément amorphe magnétostrictif destiné à être utilisé dans ce dernier

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1954575B2 (de) 1969-10-30 1972-02-17 Fa. Friedr. Krollmann, 5990 Altena Verformungspresse mit mindestens drei sternfoermig angeord neten prismatischen pressbacken insbesondere zum anangeln von rohren
JPS58139408A (ja) 1982-02-15 1983-08-18 Hitachi Metals Ltd 巻鉄心の製造方法
DE68908184T2 (de) 1988-09-26 1993-11-25 Allied Signal Inc Glasartige metallegierung für mechanisch resonierende sicherungsmarkierungssysteme.
DE9412456U1 (de) 1994-08-02 1994-10-27 Vacuumschmelze Gmbh Amorphe Legierung mit hoher Magnetostriktion und gleichzeitig hoher induzierter Anisotropie
US5539380A (en) * 1995-04-13 1996-07-23 Alliedsignal Inc. Metallic glass alloys for mechanically resonant marker surveillance systems
DE19545755A1 (de) 1995-12-07 1997-06-12 Vacuumschmelze Gmbh Verwendung einer amorphen Legierung für magnetoelastisch anregbare Etiketten in auf mechanischer Resonanz basierenden Überwachungssystemen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9826390A1 *

Also Published As

Publication number Publication date
EP0944885B1 (fr) 2002-09-18
DE19651525A1 (de) 1998-06-18
DE59708282D1 (de) 2002-10-24
JP2001506025A (ja) 2001-05-08
US6171694B1 (en) 2001-01-09
WO1998026390A1 (fr) 1998-06-18

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