WO2012159242A1 - Pièce de polarisation à coercivité élevée, son procédé de fabrication et marqueur antivol magnéto-acoustique composé de ladite pièce - Google Patents

Pièce de polarisation à coercivité élevée, son procédé de fabrication et marqueur antivol magnéto-acoustique composé de ladite pièce Download PDF

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Publication number
WO2012159242A1
WO2012159242A1 PCT/CN2011/074379 CN2011074379W WO2012159242A1 WO 2012159242 A1 WO2012159242 A1 WO 2012159242A1 CN 2011074379 W CN2011074379 W CN 2011074379W WO 2012159242 A1 WO2012159242 A1 WO 2012159242A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
label
theft
sheet
biasing
Prior art date
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Ceased
Application number
PCT/CN2011/074379
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English (en)
Chinese (zh)
Inventor
李霖
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.)
Ningbo Signatronic Tech Ltd
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Ningbo Signatronic Tech Ltd
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 Ningbo Signatronic Tech Ltd filed Critical Ningbo Signatronic Tech Ltd
Priority to PCT/CN2011/074379 priority Critical patent/WO2012159242A1/fr
Publication of WO2012159242A1 publication Critical patent/WO2012159242A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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 SYSTEMS, e.g. PERSONAL 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
    • 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

Definitions

  • the invention relates to a commercial anti-theft protection alarm device and a manufacturing method thereof, in particular to a cobalt-free nickel-free or low-nickel high-coercivity biasing sheet which can be stably produced, a manufacturing method thereof and a sound made therefrom Magnetic anti-theft tag.
  • Acoustic magnetic technology has been widely used in electronic object surveillance anti-theft devices for more than 20 years.
  • U.S. Patent No. 4,510,489 which discloses the original invention, discloses that certain amorphous alloy material ribbons can emit strong resonance due to their high magnetic-elastic coupling coefficient. Signals, and using this principle to successfully apply these materials to commercial anti-theft systems (acoustic magnetic systems), such as anti-theft systems in large supermarkets.
  • Acoustic magnetic systems mainly include detectors, decoders and verifiers, anti-theft acoustic magnetic targets, etc.
  • the commercially widely used detectors are Ultramax detectors manufactured by Sensormatic Electronics Corporation of the United States.
  • the detector is capable of transmitting a 58 kHz pulse wave that is used to excite an undecoded (active) anti-theft acoustic magnetic target in the detection zone to resonate at 58 kHz to produce a strong signal that is detected by the detector coil within the detector. Accept, trigger the alarm by the signal amplification analysis.
  • Decoding is to demagnetize the biasing piece in the anti-theft acoustic magnetic target to shift the resonant frequency out of the detection band window, while also significantly reducing the resonance signal strength without triggering an alarm.
  • Anti-theft acoustic magnetic targets can be divided into two types: anti-theft acoustic magnetic hard targets and anti-theft acoustic magnetic labels (hereinafter referred to as acoustic magnetic labels).
  • the anti-theft acoustic magnetic hard target uses an amorphous ribbon as a resonant piece, and a permanent magnet material (such as a permanent magnet bonded ferrite) is used as the offset piece.
  • a theft prevention target for example, Supertag I, II, III produced by Sensormatic
  • the anti-theft hard target on the paid item is removed by opening the mechanical needle lock device with the unlocker
  • the target method allows the item to leave the store without triggering the door alarm.
  • the acousto-magnetic label also uses an amorphous ribbon as the resonator, but uses a "semi-hard magnetic" material as the biasing element (for example, the DR acoustic magnetic anti-theft soft label manufactured by Sensormatic).
  • a "semi-hard magnetic" material for example, the DR acoustic magnetic anti-theft soft label manufactured by Sensormatic.
  • Such acoustic magnetic labels can be repeatedly decoded and activated.
  • the acousto-magnetic label on the paid item causes the item to leave the store without deactivating the door alarm by means of demagnetization decoding on the decoder.
  • the biasing piece is a key component in the acoustic magnetic tag.
  • the "semi-hard magnetic” material has a DC coercive force between soft magnetic material and hard magnetic material, which is 10-300 0e.
  • the coercive force of the acousto-magnetic biasing sheet is high (for example, 56-90 0e)
  • the acoustic magnetic label produced by using such a material as the offset sheet is more resistant to environmental interference magnetic fields during transportation, storage and use. high.
  • such materials are generally costly due to the presence of cobalt (strategic matter) or nickel (which has become increasingly expensive and volatile in recent years).
  • Cobalt strategic matter
  • nickel which has become increasingly expensive and volatile in recent years.
  • FeCrCo semi-hard magnetic biasing elements which have been used commercially for a long time, contain expensive cobalt (about 7-17 wt%).
  • VAC Vacuumshemelze
  • the method of the method of the Arnold method (US5716460) (the same as the other method of the strip film processing), including the first roll mill (to 0. 2 mm), and then the multi-roll mill to finish rolling to about 0. 05mm ( That is, the rolling method of the offset sheet thickness which is generally accepted in the industry.
  • a 4-roll mill with a lower processing cost can be rolled up to about 0.07.
  • Technical requirements 0. 065mm thickness or less has to use Z-mi ll (20-roll or 26-high-precision rolling mill).
  • the processing cost is abruptly much higher than the material cost of the base metal (such as Fe-Mn based alloy) strip. This is inconsistent with the economic goal of reducing the cost of a large-scale offset sheet without cobalt or nickel or low nickel, and is not necessary.
  • An example of the structure of an existing acoustic magnetic tag includes an elongated plastic case and a lid attached thereto, the cover being sequentially from top to bottom
  • the cover film, the double-sided tape, the offset piece of the semi-hard magnetic material and the cover film are superposed, and one or more pieces of the superimposed resonator piece whose size is matched with the case body are placed in the cavity of the box body, wherein the offset piece
  • the shape of the offset sheet that was later developed may also be rectangular.
  • the present invention provides an offset sheet which is cobalt-free, nickel-free or low-nickel, low in cost, and high in coercive force.
  • the present invention also provides a method for large-scale stable manufacturing of the above high coercivity biasing sheet.
  • the present invention also provides a decodable acoustic magnetic anti-theft tag comprising the above biasing sheet.
  • the invention also provides a magneto-optical label label arrangement combination and a combined magnetization activation method for a large number of the above-mentioned offset sheets, so that the total leakage magnetic field of the label is insufficient when the label is formed into a label or a label Self-demagnetization due to mutual influence. It greatly simplifies the process of label activation, storage and transportation while increasing reliability.
  • a high coercivity biasing sheet which is cold rolled to a final thickness by 10 to 14 wt% of Mn, a total of no more than 7 wt% of any other transition metal or balance of Fe, to a final thickness. After a final aging treatment of more than 5 minutes and less than 590 ° C, the thickness is 0. 065-0. 18 mm, and the DC coercive force is 56-90 Oe.
  • the corresponding acoustic magnetic label is more stable, and it has been experimentally proven that it can be completely demagnetized and deactivated on the currently widely used decoders.
  • the bias magnet pair with higher coercive force 56-90 Oe
  • the stability of label storage, transportation and use is economically and technically advantageous. (It can completely replace the low-coercivity semi-hard magnetic material with a high nickel content of about 20 Oe for He).
  • the sum of any one or more of the transition metal in the alloy ribbon does not exceed 5% by weight. 5 ⁇
  • the Mn content of the alloy ribbon is 11. 5_12. 5wt%, the sum of any other transition metal or more does not exceed 2wt%, the balance is Fe.
  • the strip is slit to a width of 4 to 10 inches and then cut to a length of 32 to 40 to obtain an offset sheet.
  • a method for manufacturing a high coercivity biasing sheet which comprises using an alloy material of any one or more transition metals and a balance of Fe having a composition of 10 to 14 wt% Mn and a total of not more than 5 wt%, after smelting, ingot casting, Hot-rolled, hot-rolled, hot-rolled oxidized surface, softened at 840 ° C, with a 4-roll mill (without Z-mi ll, such as a 20-roll or 26-high-precision mill) cold rolled to 0. 07-0. 09 After ⁇ , do a long time aging treatment at 540 °C for 2-10 hours.
  • the alloy material is subjected to cold rolling only after cold rolling +490 ° C / 5 hours final thickness aging, without performing any intermediate thickness at a lower temperature of 400-600 ° C Y - ⁇ dual phase zone aging deal with.
  • the thickness of the alloy is 0.15_12. 5wt% Mn, the total of the other or more than 2% of the transition metal, the balance of the Fe thin alloy strip, the thickness of 0. 07- 0. 085 mm.
  • An acousto-magnetic anti-theft tag comprising an elongated box body and a magnetic offset piece, the acousto-magnetic anti-theft tag comprising a high coercivity biasing piece as described above, and at least one piece having a length of 35-45 inches and a width of 5 ⁇
  • the resonant frequency of the active state of the tag is 57. 1-58. 9 kHz. 5 kHz ⁇ Further, the active state resonant frequency is 57. 5-58. 5 kHz.
  • An acoustic magnetic anti-theft tag comprising a long and narrow box body and a magnetic offset piece, wherein a cavity of the box body is provided a diaphragm, the cover is covered with a cover made of a double-sided tape and a cover film, and the cover film, the magnetic offset piece and the resonance piece are arranged in a layer, and the magnetic offset piece is as described above.
  • High coercivity material offset sheet
  • the arrangement structure of the acoustic magnetic anti-theft tag wherein the acoustic magnetic anti-theft tag is closely arranged on the same plane as a single version, and at least one edge of the acoustic magnetic anti-theft tag is spaced apart from the edge of the adjacent acoustic anti-theft tag by less than 0 1 mm, consisting of 40-120 labels in a single version, each box is commercially available with at least 20 labels, and the ratio of labels with the same bias sheet magnetization direction in each version is 50%-100%.
  • Another arrangement structure of the acoustic magnetic anti-theft tag wherein the acoustic magnetic anti-theft tags are parallel to each other and form a label perpendicular to the length direction of the supporting bottom band, and the edge of the acoustic magnetic anti-theft tag and the adjacent acoustic magnetic anti-theft
  • the label edge spacing is 2-4 mm, and the 2000-8000 labels are composed of a single volume.
  • Each box is commercially available with at least one label, and the ratio of the label with the same biasing sheet magnetization direction in each volume is 50%-100%.
  • the present invention has the following features compared to the prior art:
  • the present invention overcomes the technical bias of cobalt or nickel in the high coercivity of the acousto-magnetic label offset sheet, demonstrating that only a very inexpensive Fe-(10-14 wt%) Mn-based alloy has been subjected to the steps disclosed by the present invention. High coercivity can be obtained.
  • the method for manufacturing the offset sheet of the present invention eliminates the technical disadvantage of high processing cost of rolling with Z-mi ll (20-roll or 26-roll multi-roll high-precision rolling mill), saving expensive final processing costs and maintaining Low price advantage of Fe-Mn based alloy bias materials.
  • the method of the offset sheet of the invention eliminates the step of intermediate aging treatment which is considered necessary in the past, saves processing cost and material cost, and has simple process and convenient processing.
  • the method of the biasing sheet of the invention eliminates the technical prejudice that the heat treatment of the final thickness of the Fe-(8-18wt%) Mn material can not exceed 3 minutes, and prolongs the aging heat treatment time to 1-10 hours of the process window.
  • the offset strips with consistent coercivity in mass production are made simple and controllable.
  • the acousto-magnetic anti-theft tag of the present invention is manufactured by using a high coercivity low-cost Fe_(10-14wt%) Mn-based alloy material, which greatly improves the label stability and has obvious cost advantages, and at the same time, breaks He of about 60 0e.
  • the biasing material is not susceptible to technical bias in commercial deactivator demagnetization.
  • the label of the invention has strong market competitiveness and vitality.
  • the acoustic magnetic anti-theft tag of the present invention is manufactured by using a high coercivity low-cost Fe_(10-14wt%) Mn-based alloy material, which greatly improves the label stability and has obvious cost advantages, so that the magnetization activation method must be eliminated.
  • Technical bias for alternating magnetization directional limitations It makes the label activating, storing and transporting the label simple and reliable.
  • Figure 1 is a schematic view showing the structure of a label of the present invention.
  • the alloy material (containing 12. lwt% Mn, 0.05% by weight Cr, balance Fe) is smelted and then ingot, hot forged, smelted and ingot, hot forged, hot rolled to 5 ⁇ , the surface oxide layer is removed, and then the surface oxide layer is removed.
  • the alloy material (containing 12.8 wt% Mn, 1. lwt% Ni, 0.05 wt% Cr, balance Fe) is smelted and then ingot, hot forged, smelted and ingot, hot forged, hot rolled to 5 ⁇ , 5 ⁇
  • the surface is then cold-rolled to 0. 5 ⁇ , 850 °C single-phase zone softening treatment, and then directly cold-rolled to 0. 115 mm with a 4-roll mill, placed in a vacuum furnace 540 °C / 2. 5 hours duplex After the aging period, the slits were cut into different coils of 6 mm width, and the coils were cut into 36 mm long offset sheets by a high speed shear. The magnetic properties were then tested. The typical magnetic properties of the Fe-Mn based alloy biasing sheet are shown in Table 1.
  • the alloy material (containing 10. 5 wt% Mn, 1. lwt% Mo, 0.05 wt% Cr, 0.3 wt% Ti, balance Fe) is smelted and then ingot, hot forged, smelted, ingot, hot forged, The hot-rolled to 5 ⁇ , the surface is then cold-rolled to 0. 5mm, 850 ° C single-phase zone softening treatment, and then directly cold rolled to 0. 08 mm with a 4-roll mill, placed in a vacuum furnace 570 ° C / 1 After the aging of the two-phase phase, the magnetic properties were tested.
  • the typical magnetic properties of the Fe-Mn based alloy biasing sheet are shown in Table 1.
  • the acoustic magnetic anti-theft tag manufactured by using the above-mentioned offset piece comprises a long and narrow box body 3 and a magnetic biasing piece 1.
  • the cavity of the box body 3 is provided with a resonance piece 2, and the box body is covered with a double-sided tape and a cover.
  • the cover 5 composed of the film 4, the cover film 4, the magnetic offset piece 1 and the three pieces of the resonance piece are arranged in layers, as shown in Fig. 1, the resonance piece is a FeNiMoB amorphous resonance element having a width of 6 mm. See Table 2 for the comparison between the alarm performance of the anti-theft tag and the DR tag made of the low coercivity offset piece.
  • the effect comparison data is shown in Table 3. 1 Typical Magnetic Properties of Fe-Mn Based Alloy Bias Sheets Obtained in Examples 1-3 Examples Aging Temperature Aging Time He Br Bm ⁇ Br/Bm
  • Bm is the magnetic field strength at the maximum magnetic field strength of 150 Oe used in the test.
  • the detector is a single-chassis Ultropost commercial detector manufactured by Sensormatic, which is widely used. The detection is performed perpendicular to the surface of the acoustic magnetic label detector in the direction of the acoustic magnetic label, and then the two alarm distances are measured in the direction of the inverted magnetic magnetic label.
  • Decoder 1 Sensormatic Slimpad decoder, the label length is parallel to the decoder surface.
  • Decoder 2 Sensormatic RapidPad decoder, label length perpendicular to the decoder surface
  • the tag of the present invention can be demagnetized by the same commercial decoder as compared with the current DR tag. This is an important basis for the invention label to be used in the market.
  • the label made in the first embodiment is bent along the length center line toward the resonator side to 90 degrees, so that the offset sheet is Fully 90 degree bending plastic deformation, and then pressing the center line of the label length direction, the label is pulled back to the original straight shape, and the offset piece is plastically deformed again so that the label is substantially reset in the length direction.
  • Table 4 lists the measured values of the resonant frequency change.
  • the resonant frequency change value of at least one of the labels of the present invention after the above bending method is less than 0.995 kHz, so the label of the present invention is highly resistant to mechanical bending damage.
  • the alarm frequency window is 57. 7-58. 3 kHz commercial alarm device, the above-mentioned extreme mechanical damage has a very limited effect on the resonant frequency, and the alarm performance is not very good after encountering intentional or unintentional bending. Great impact.
  • the acoustic magnetic label of the high-force Fe-n-based alloy biasing sheet resists the demagnetizing field stability test produced by the combination of a large number of labels: 25000 labels made by the offset sheet of the embodiment 1 are all pressed one by one. The direction is activated, and the North Pole mark is marked on each label, and then all the tests are performed according to the methods listed in Table 2, and the qualified labels with the two-way alarm distance of 75 cm or more are selected for the following experiment.
  • Label arrangement 5000 test labels per roll, inner diameter 75 mm.
  • the PET separation bottom width is 48mm, and the label is perpendicular to the length of the PET separation base strip.
  • Each label is spaced 3 mm apart.
  • a total of 3 rolls were assembled and loaded into the carton.
  • the 3-volume trays are stacked neatly. All labels in the north pole are oriented in the same direction. Then, when simulating the actual use of the customer, remove each label of the volume sandwiched in the middle, and perform the alarm performance tests listed in Table 2 one by one.
  • the experimental result is that the 5,000-packed label has a two-way alarm distance of 75 cm or more, all qualified.
  • the combination mode does not demagnetize each other in the case where the possible leakage magnetic field is maximum, and is stable, so that it is not necessary to impose any limitation on the magnetization direction.
  • the examples are merely illustrative of the invention and are not intended to limit the scope of the invention.
  • the acoustic magnetic anti-theft tag of various structures can be manufactured by using the offset piece provided by the present invention, and the present invention only illustrates the application of the offset piece of the present invention by the above-mentioned Embodiment 1.
  • various modifications and changes may be made by those skilled in the art in the form of the present invention.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (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)

Abstract

La présente invention concerne une pièce de polarisation à coercivité élevée pouvant être fabriquée de manière stable, son procédé de fabrication et un marqueur antivol magnéto-acoustique composé de ladite pièce. La pièce de polarisation est fabriquée par une bande d'alliage contenant 10-14 % en poids de Mn, la quantité totale n'étant pas supérieure à 7 % en poids d'un ou de plusieurs métaux de transition, et le reste étant Fe. Après le laminage à froid de la bande d'alliage jusqu'à une épaisseur finale et un processus de vieillissement final pendant plus de 5 minutes à une température inférieure à 590 °C, la pièce de polarisation peut être fabriquée. L'épaisseur de la pièce de polarisation est de 0,065-0,18 mm et sa coercivité de courant continu est de 56-90 oe. Le procédé de fabrication de la pièce de polarisation comprend les étapes suivantes consistant à : laminer à froid la bande d'alliage jusqu'à 0,07-0,15 mm, effectuer un traitement de vieillissement à la température de 450-570 °C pendant 0,5-20 heures pour obtenir une bande magnétique présentant une coercivité de 60-85 Oe, découper la bande magnétique pour obtenir les dimensions requises. La présente invention supprime l'inconvénient selon lequel la pièce de polarisation doit contenir du cobalt ou du nickel, et prouve qu'une coercivité élevée peut être obtenue par utilisation d'un alliage à base de Fe (10-14% en poids) et de Mn peu coûteux traité par le présent procédé.
PCT/CN2011/074379 2011-05-20 2011-05-20 Pièce de polarisation à coercivité élevée, son procédé de fabrication et marqueur antivol magnéto-acoustique composé de ladite pièce Ceased WO2012159242A1 (fr)

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PCT/CN2011/074379 WO2012159242A1 (fr) 2011-05-20 2011-05-20 Pièce de polarisation à coercivité élevée, son procédé de fabrication et marqueur antivol magnéto-acoustique composé de ladite pièce

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PCT/CN2011/074379 WO2012159242A1 (fr) 2011-05-20 2011-05-20 Pièce de polarisation à coercivité élevée, son procédé de fabrication et marqueur antivol magnéto-acoustique composé de ladite pièce

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024255233A1 (fr) * 2023-06-16 2024-12-19 宁波讯强电子科技有限公司 Étiquette antivol magnétique acoustique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5716460A (en) * 1996-05-08 1998-02-10 The Arnold Engineering Company Methods for making magnetic strips
US20040207528A1 (en) * 2003-02-27 2004-10-21 Fabian Carl E. Miniature magnetomechanical marker for electronic article surveillance system
US6893511B1 (en) * 1998-09-10 2005-05-17 Hitachi Metals, Ltd. Production method for semirigid magnetic material and semirigid material and magnetic marker using it
US20070290857A1 (en) * 2006-06-16 2007-12-20 Ningbo Signatronic Technologies, Ltd. Anti-theft security marker with soft magnetic bias component

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5716460A (en) * 1996-05-08 1998-02-10 The Arnold Engineering Company Methods for making magnetic strips
US6893511B1 (en) * 1998-09-10 2005-05-17 Hitachi Metals, Ltd. Production method for semirigid magnetic material and semirigid material and magnetic marker using it
US20040207528A1 (en) * 2003-02-27 2004-10-21 Fabian Carl E. Miniature magnetomechanical marker for electronic article surveillance system
US20070290857A1 (en) * 2006-06-16 2007-12-20 Ningbo Signatronic Technologies, Ltd. Anti-theft security marker with soft magnetic bias component

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024255233A1 (fr) * 2023-06-16 2024-12-19 宁波讯强电子科技有限公司 Étiquette antivol magnétique acoustique

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