EP0744722B1 - Magnetisches Antidiebstahletikett - Google Patents

Magnetisches Antidiebstahletikett Download PDF

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Publication number
EP0744722B1
EP0744722B1 EP19960201425 EP96201425A EP0744722B1 EP 0744722 B1 EP0744722 B1 EP 0744722B1 EP 19960201425 EP19960201425 EP 19960201425 EP 96201425 A EP96201425 A EP 96201425A EP 0744722 B1 EP0744722 B1 EP 0744722B1
Authority
EP
European Patent Office
Prior art keywords
tag
antipilferage
easy axis
magnetic
layers
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
EP19960201425
Other languages
English (en)
French (fr)
Other versions
EP0744722A1 (de
Inventor
Hugo Lievens
Paul Lippens
Pascal Verheyen
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.)
Innovative Sputtering Technology IST NV
Original Assignee
Innovative Sputtering Technology IST NV
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 Innovative Sputtering Technology IST NV filed Critical Innovative Sputtering Technology IST NV
Priority to EP19960201425 priority Critical patent/EP0744722B1/de
Publication of EP0744722A1 publication Critical patent/EP0744722A1/de
Application granted granted Critical
Publication of EP0744722B1 publication Critical patent/EP0744722B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • 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
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/244—Tag manufacturing, e.g. continuous manufacturing processes
    • 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
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details

Definitions

  • the present invention relates to an antipilferage or antitheft tag for an electronic article surveyance system (E.A.S.).
  • E.A.S. electronic article surveyance system
  • Such an antipilferage tag comprises a soft-magnetic thin film for use as an active element which is insensitive to its orientation in a detection gate of an E.A.S. system.
  • the present invention also relates to a method of making an antipilferage tag insensitive to its orientation in such a detection gate.
  • Such antipilferage tags or markers which comprise a soft-magnetic thin film for use as an active element are known in the art.
  • the term 'thin' herein refers to a film having a thickness which is smaller than 10 micrometer, or smaller than 5 micrometer, e.g. about 1 to 2 micrometer.
  • the term 'soft-magnetic' stays in contradiction with a magnetically hard or semi-hard material.
  • the term 'soft-magnetic' refers to materials having a rather low coercive force, for example a coercive force lying below 500 A/m, preferably from 3 to 100 A/m.
  • Such a soft-magnetic thin film can be made of an amorphous metal glass with only a limited amount of crystalline phases.
  • Such a soft-magnetic thin film can be manufactured by means of physical vapor deposition techniques such as sputtering processes.
  • the terms 'use as an active element' mean that, if the antipilferage tag is not deactivated at the point of sale, the active element must trigger a particular alarm signal in an alternating magnetic field at a detection gate which may be installed at the exit of a shop.
  • the antipilferage tag also comprises a deactivating material usually in the form of a magnetically hard or semi-hard material with a high coercive force which ranges, for example, from 4000 to 20 000 A/m. After deactivation of the antipilferage tag, usually at the point and at the moment of sale, the active element, i.e. the soft-magnetic thin film, is kept in saturation and no longer causes a typical response in a detection gate.
  • the antipilferage tag usually also comprises , next to the soft-magnetic film a thin organic substrate (thickness : e.g. about 23 ⁇ m), e.g. of a polyester or of a polyethylene terephtalate, an organic overlayer of e.g. polypropylene and an adhesive to adhere the antipilferage tag to the products to be protected.
  • a thin organic substrate e.g. about 23 ⁇ m
  • an organic overlayer e.g. polypropylene
  • EP-A1-0 459 722 discloses a multi-layer thin-film marker for E.A.S. systems.
  • Various parts of the marker e.g. various layers, have a magnetic easy axis in a direction transverse to the direction of a magnetic easy axis of a neighbouring layer.
  • the invention aims at avoiding the problems of the prior art. It is an object of the present invention to provide an antipilferage tag which is highly insensitive to its orientation in a detection gate. It is also an object of the present invention to provide a simple method of making an antipilferage tag insensitive to its orientation.
  • an antipilferage tag which comprises a soft-magnetic thin film for use as an active element.
  • the film has a magnetic easy axis with a particular direction.
  • the tag has been folded along at least one folding line so that the tag comprises at least two layers which at least partially overlap with each other.
  • the folding line forms an oblique angle different from zero with the direction of the magnetic easy axis so that the direction of the magnetic easy axis in one layer is different from the direction of the magnetic easy axis in another layer.
  • the oblique angle preferably ranges from 30° to 60° and is preferably about 45°.
  • the advantage of an oblique angle of 45° is that the direction of the easy axis in one layer becomes perpendicular to the direction of the easy axis in another layer. Such a situation gives the highest degree of insensitivity of the orientation of the tag in a detection gate.
  • the different layers may be bound to each other by means of an adhesive.
  • the overlapping of the layers is 100%.
  • the reason here is again that such a situation gives the highest degree of insensitivity of the orientation of the tag in a detection gate.
  • the antipilferage tags according to the invention may take a lot of geometrical forms which depend upon the ultimate use of the tag. Rectangular, square, triangular and circular forms are, however, very common forms which may be used in a lot of practical situations of source-labeling of products.
  • a method of making an antipilferage tag insensitive to its orientation in a detection gate of an antipilferage system comprises a step of folding the tag at least once along a folding line so that the tag comprises at least two layers which at least partially overlap with each other.
  • the folding line forms an oblique angle different from zero with the direction of the magnetic easy axis so that the direction of the magnetic easy axis in one layer is different from the direction of the magnetic easy axis in another layer.
  • FIGUREs 1, 2 and 3 illustrate how an antipilferage tag for use inside capsules of bottles is made.
  • FIGURE 1 shows a square piece of a tag 100 having a soft-magnetic thin film and having a side of 28 mm and having the direction of its easy axis 102 parallel to one pair of sides.
  • the square tag 100 will be folded according folding lines 104 (illustrated by means of dash lines) which make an angle ⁇ of 45° with the direction of the easy axis 102.
  • FIGURE 3 is a square piece of a tag 100 with a diagonal line of 28 mm and comprising two layers : an under layer with a direction of easy axis 102 and an upper layer with a direction of easy axis 106 perpendicular to easy axis 102.
  • the upper layer may be bound by means of a suitable adhesive to the under layer.
  • Such a folded square tag 100 can be used inside a capsule of a diameter of 30 mm.
  • Antipilferage tags according to this first example of the invention have been compared with respect to the sensitivity of their orientation in a detection gate to square tags having also a diagonal line of 28 mm and consisting of only one layer. Table 1 hereunder gives average levels of signal responses expressed in mV measured in a detection gate.
  • Double-layer tag according to the invention 0 376 358 10 338 322 20 284 267 30 226 216 45 77 144 60 0 219 90 0 307
  • a surface modulation such as described in WO-A1-92/07343 has been performed.
  • a single-layer tag according to the prior art does not give a response over at least 30 degrees out of 90 degrees and only gives a weak signal at 45 degrees.
  • a label according to the invention gives a response of an appropriate level over the complete range of 90 degrees. For reasons of symmetry this means that a tag according to the invention is detectable over 360 degrees.
  • the same results as the invention tag can be achieved by cutting two square pieces of soft-magnetic films, turning one piece over 90° and adhering the two pieces to each other.
  • the direction of easy axis is a direction which is not visible, this is an operation which is more difficult to carry out and to automate than a method according to the invention.
  • the direction of the easy axis makes an oblique angle different from zero with the folding lines. This is straightforward since the direction of the easy axis is perpendicular to the direction of movement of the film during its production. So if one pair of sides of the square tag is parallel to the direction of movement of the film, the direction of the easy axis will be parallel to one pair of sides of the square and the tag may be folded according to FIGURES 1, 2 and 3.
  • FIGURE 4 illustrates the starting material which is a round tag 108 with a diameter of 29 mm (or 33 mm).
  • Dotted lines 110 form the diagonal lines of a square having as sides the folding lines 104 with a length of 15.5 mm so that a round aperture of 15.5 mm diameter exactly fits therein.
  • the tag 108 is cut along dotted lines 110 and along dotted lines 112.
  • the reason for cutting along lines 110 is to allow the next folding step illustrated in FIGURE 5.
  • the reason for cutting along lines 112 is to prevent the second layer from extending beyond the border of tag 108 after folding (see FIGURE 6).
  • parts of the tag 108 are folded along folding lines 104 as illustrated in FIGURE 5.
  • the result is a tag as shown in FIGURE 6 with a circular form, a part 114 with no overlapping, thus consisting of only one layer with only one direction of easy axis 102 and a part 116 with overlapping and consisting of two layers with two directions 102 and 106 of the easy axis.
  • a tag according to this second example has been compared with an annular tag having an inner diameter of 15.5 mm and an outer diameter of 29 mm with respect to their levels of responses in a detection gate.
  • the results have been summarized in table 2 hereunder.
  • Angle between axis of detection coil and easy axis of only layer or of under layer (degrees) Annular tag with single layer according to the prior art Tag with partially a double layer according to the invention (with surface modulation) Tag with partially a double layer according to the invention (without surface modulation) 0 345 282 331 10 323 253 327 20 264 210 322 30 195 164 291 45 75 95 209 60 4 77 147 90 0 96 138
  • an antipilferage tag according to the prior art gives almost no signal over at least a range of 30 degrees, whereas the antipilferage tags according to the invention give a response of a proper level over the whole range of 90 degrees.
  • the antipilferage tag according to the invention without surface modulation gives better results than an antipilferage tag according to the invention with surface modulation, which is an advantage since this makes a supplementary step in the manufacturing process of a antipilferage tag superfluous.
  • 'surface modulation' are herein used in the same meaning as international application WO-A1-92/07343 and may consist, for example, in removing material from the soft-magnetic thin film in order to increase the level of response of the tag in a detection gate.
  • FIGURE 7 shows the starting material which is an elongated rectangular strip of a tag 118 that can be made, for example, by cutting the tag along its longitudinal direction.
  • the easy axis 102 is perpendicular to the longitudinal side of strip 118.
  • Folding lines 104 make an angle of 45° with the direction of easy axis 102. These folding lines 104 may be made, for example, by applying a sharpened point to the surface of strip 118.
  • FIGURES 8 illustrates the next manufacturing step where strip 118 is wrapped around a core strip 120 which is adhesive on both surfaces.
  • the strip 118 will fold along folding lines 104 under influence of the wrapping operation and will form a two-layered antipilferage tag, one layer on each side of core strip 120.
  • the intermediate product is shown in FIGURE 9.
  • the next step consists in cutting the intermediate product along lines I-I, II-II, III-III in order to obtain square tags 122 and 124 as illustrated respectively in FIGURE 10 and in FIGURE 11.
  • FIGUREs 12 and 13 illustrate yet another way of making a square antipilferage tag according to the invention.
  • the start material shown in FIGURE 12, is a rectangular piece of a tag 126, having long sides which are twice as long as the short sides. Both sides make an angle of 45° with the direction of easy axis 102. Folding the rectangular piece of tag 126 along folding line 104 results in the double-layered square tag of FIGURE 13.
  • FIGUREs 14 and 15 illustrate how a triangular antipilferage tag according to the invention can be made.
  • FIGURE 14 shows the start material which is a square piece of tag 128 having one pair of sides parallel to the direction of easy axis 102. Folding the square piece of tag 128 along folding line 104 which is one of the diagonals of the square, results in a triangular two-layered anti-pilferage tag shown in FIGURE 15.

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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)
  • Manufacturing & Machinery (AREA)
  • Burglar Alarm Systems (AREA)

Claims (9)

  1. Antidiebstahletikett umfassend einen weich-magnetischen, dünnen Film (100) zur Verwendung als ein aktives Element, wobei der Film eine magnetische Vorzugsachse (102) mit einer speziellen Richtung hat,
    dadurch gekennzeichnet,
    dass das Etikett entlang wenigstens einer Faltlinie (104) gefaltet ist, so dass das Etikett wenigstens zwei Lagen umfaßt, die sich wenigstens teilweise gegenseitig überlappen, wobei die wenigstens eine Faltlinie (104) mit der Richtung der magnetischen Vorzugsachse einen schrägen, von 0 verschiedenen Winkel bildet, so dass die Richtung der magnetischen Vorzugsachse (102) in einer Lage unterschiedlich zu der Richtung der magnetischen Vorzugsachse (106) in einer anderen Lage ist.
  2. Antidiebstahletikett nach Anspruch 1, bei welchem der schräge Winkel in einem Bereich von 30° bis 60° liegt.
  3. Antidiebstahletikett nach einem der vorherigen Ansprüche, bei welchem die wenigstens zwei Lagen mittels eines Klebstoffes aneinander befestigt sind.
  4. Antidiebstahletikett nach einem der vorherigen Ansprüche, bei welchem es nur zwei Lagen gibt.
  5. Antidiebstahletikett nach Anspruch 4, bei welchem die zwei Lagen sich gegenseitig vollständig überlappen.
  6. Antidiebstahletikett nach einem der vorherigen Ansprüche, bei welchem das Etikett vor dem Falten eine quadratische Form hat.
  7. Antidiebstahletikett nach einem der vorherigen Ansprüche, bei welchem das Etikett nach dem Falten eine quadratische Form hat.
  8. Verfahren, bei dem eine Antidiebstahletikett unempfindlich bezüglich seiner Ausrichtung in einer Nachweisschranke eines elektronischen Warenüberwachungssystems gemacht wird, wobei das Antidiebstahletikett einen weich-magnetischen, dünnen Film (100) als ein aktives Element umfaßt, und wobei der Film eine magnetische Vorzugsachse (102) mit einer speziellen Richtung aufweist,
    dadurch gekennzeichnet,
    dass das Verfahren einen Schritt umfaßt, bei dem das Etikett wenigstens einmal entlang einer Faltlinie (104) gefaltet wird, so dass das Etikett wenigstens zwei Lagen umfaßt, die sich wenigstens teilweise gegenseitig überlappen, und wobei die Faltlinie mit der Richtung der magnetischen Vorzugsachse (102) einen schrägen, von O verschiedenen Winkel bildet, so dass die Richtung der magnetischen Vorzugsachse (102) in einer Lage unterschiedlich zu der Richtung der magnetischen Vorzugsachse (106) in einer anderen Lage ist.
  9. Verfahren nach Anspruch 8, wobei das Verfahren außerdem einen Schritt umfasst, bei dem die wenigstens zwei Lagen mittels eines Klebstoffs aneinander verbunden werden.
EP19960201425 1995-05-24 1996-05-20 Magnetisches Antidiebstahletikett Expired - Lifetime EP0744722B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19960201425 EP0744722B1 (de) 1995-05-24 1996-05-20 Magnetisches Antidiebstahletikett

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP95201368 1995-05-24
EP95201368 1995-05-24
EP19960201425 EP0744722B1 (de) 1995-05-24 1996-05-20 Magnetisches Antidiebstahletikett

Publications (2)

Publication Number Publication Date
EP0744722A1 EP0744722A1 (de) 1996-11-27
EP0744722B1 true EP0744722B1 (de) 2001-07-18

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EP19960201425 Expired - Lifetime EP0744722B1 (de) 1995-05-24 1996-05-20 Magnetisches Antidiebstahletikett

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6498062B2 (en) 2001-04-27 2002-12-24 Micron Technology, Inc. DRAM access transistor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5083112A (en) * 1990-06-01 1992-01-21 Minnesota Mining And Manufacturing Company Multi-layer thin-film eas marker

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EP0744722A1 (de) 1996-11-27

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