EP0944885A1 - Label for use in acousto-magnetic anti-theft devices - Google Patents
Label for use in acousto-magnetic anti-theft devicesInfo
- 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
Links
- 238000012544 monitoring process Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000005415 magnetization Effects 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000009849 deactivation Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims 5
- 238000004080 punching Methods 0.000 claims 4
- 230000010355 oscillation Effects 0.000 claims 3
- 230000000737 periodic effect Effects 0.000 claims 3
- 239000012790 adhesive layer Substances 0.000 claims 2
- 238000005259 measurement Methods 0.000 claims 1
- 230000005284 excitation Effects 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19651525A DE19651525A1 (en) | 1996-12-11 | 1996-12-11 | Labels in acustomagnetic anti-theft systems |
DE19651525 | 1996-12-11 | ||
PCT/DE1997/002893 WO1998026390A1 (en) | 1996-12-11 | 1997-12-11 | Label for use in acousto-magnetic anti-theft devices |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0944885A1 true EP0944885A1 (en) | 1999-09-29 |
EP0944885B1 EP0944885B1 (en) | 2002-09-18 |
Family
ID=7814384
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97952717A Expired - Lifetime EP0944885B1 (en) | 1996-12-11 | 1997-12-11 | Label for use in acousto-magnetic anti-theft devices |
Country Status (5)
Country | Link |
---|---|
US (1) | US6171694B1 (en) |
EP (1) | EP0944885B1 (en) |
JP (1) | JP2001506025A (en) |
DE (2) | DE19651525A1 (en) |
WO (1) | WO1998026390A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19953334C2 (en) | 1999-11-05 | 2002-05-08 | Siemens Ag | Remote readable identification tag and method for operating several such identification tags |
WO2010082195A1 (en) | 2009-01-13 | 2010-07-22 | Vladimir Manov | Magnetomechanical markers and magnetostrictive amorphous element for use therein |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1954575B2 (en) | 1969-10-30 | 1972-02-17 | Fa. Friedr. Krollmann, 5990 Altena | FORMING PRESS WITH AT LEAST THREE STAR-SHAPED PRISMATIC PRISM JAWS IN PARTICULAR FOR FINGING PIPES |
JPS58139408A (en) * | 1982-02-15 | 1983-08-18 | Hitachi Metals Ltd | Wound iron core |
JPH04500985A (en) | 1988-09-26 | 1992-02-20 | アライド―シグナル・インコーポレーテッド | Metallic glass alloys for mechanical resonance target monitoring systems |
DE9412456U1 (en) | 1994-08-02 | 1994-10-27 | Vacuumschmelze Gmbh | Amorphous alloy with high magnetostriction and at the same time high induced anisotropy |
US5539380A (en) * | 1995-04-13 | 1996-07-23 | Alliedsignal Inc. | Metallic glass alloys for mechanically resonant marker surveillance systems |
DE19545755A1 (en) | 1995-12-07 | 1997-06-12 | Vacuumschmelze Gmbh | Use of an amorphous alloy for magnetoelastic excitable labels in monitoring systems based on mechanical resonance |
-
1996
- 1996-12-11 DE DE19651525A patent/DE19651525A1/en not_active Withdrawn
-
1997
- 1997-12-11 JP JP52609398A patent/JP2001506025A/en active Pending
- 1997-12-11 DE DE59708282T patent/DE59708282D1/en not_active Expired - Fee Related
- 1997-12-11 WO PCT/DE1997/002893 patent/WO1998026390A1/en active IP Right Grant
- 1997-12-11 EP EP97952717A patent/EP0944885B1/en not_active Expired - Lifetime
- 1997-12-11 US US09/319,760 patent/US6171694B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9826390A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1998026390A1 (en) | 1998-06-18 |
US6171694B1 (en) | 2001-01-09 |
JP2001506025A (en) | 2001-05-08 |
DE19651525A1 (en) | 1998-06-18 |
DE59708282D1 (en) | 2002-10-24 |
EP0944885B1 (en) | 2002-09-18 |
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