CN108564754B - Acoustic-magnetic anti-theft tag and offset sheet thereof - Google Patents
Acoustic-magnetic anti-theft tag and offset sheet thereof Download PDFInfo
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- CN108564754B CN108564754B CN201810626347.5A CN201810626347A CN108564754B CN 108564754 B CN108564754 B CN 108564754B CN 201810626347 A CN201810626347 A CN 201810626347A CN 108564754 B CN108564754 B CN 108564754B
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- 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
- G08B13/2422—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 acoustic or microwave 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
- G08B13/2434—Tag housing and attachment details
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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)
- Acoustics & Sound (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The invention discloses an acousto-magnetic anti-theft tag and a bias sheet thereof, wherein the disclosed bias sheet for the acousto-magnetic anti-theft tag is made of a material containing 10-14wt% of manganese, at least one transition group metal with the total content not exceeding 7wt% and the balance of iron, the residual magnetism of the bias sheet is larger than 12000Gs, and the width of the bias sheet is 1.5-3.8mm; wherein the transition group metal does not include manganese and iron. The acoustic-magnetic anti-theft tag manufactured by using the bias sheet which is narrowed and has better material can effectively avoid the resonance frequency of the acoustic-magnetic anti-theft tag from rising after diagonal torsion, thereby greatly improving the mechanical damage resistance of the tag.
Description
Technical Field
The invention relates to the technical field of sound magnetic anti-theft, in particular to a sound magnetic anti-theft label and a bias piece thereof.
Background
The acousto-magnetic anti-theft system is widely used as one of the anti-theft systems for electronic goods with its excellent performance. The specific working principle of the sound magnetic anti-theft system is as follows: the transmitting antenna transmits an alternating magnetic field, when the acoustic-magnetic anti-theft tag enters the alternating magnetic field (detection area), and the resonance frequency of the acoustic-magnetic anti-theft tag is consistent with the carrier frequency in the alternating magnetic field, the resonance signals are generated by the resonance sheet in the acoustic-magnetic anti-theft tag under the action of the magnetic field provided by the bias sheet and are received by the receiving antenna due to the magnetic-elastic resonance effect, so that the existence of the acoustic-magnetic anti-theft tag is detected. The acousto-magnetic anti-theft system generally consists of two parts: the detector comprises a transmitting antenna and a receiving antenna, wherein an alternating magnetic field is emitted by the transmitting antenna, a detection induction area is formed between the transmitting antenna and the receiving antenna, whether an effective label exists or not is searched in a specific range by utilizing a magneto-elastic resonance principle, and an alarm is triggered when the effective label exists; the second is the sound magnetic anti-theft label, mainly made up of resonant piece producing magnetic mechanical resonance and bias piece providing bias magnetic field, wherein the resonant piece is cut into the size with the resonance frequency of 58kHz by the function of bias magnetic field provided by the bias piece accurately by the amorphous metal thin strip, can produce magnetic mechanical resonance in the detection area and reflect to the receiving antenna.
The present inventors have found that in the process of implementing the present invention, the following technical problems exist in the prior art:
When the conventional rectangular acousto-magnetic anti-theft tag is used, the shell of the acousto-magnetic anti-theft tag is a Plastic (PS) thin shell with a shape modification, so that bending or bending phenomenon can occur frequently due to the action of external force, but the bending or bending of the general degree does not obviously influence the performance of the acousto-magnetic anti-theft tag. Therefore, when bending or bending occurs, the acoustic-magnetic anti-theft label can be normally used after being restored to a flat state.
However, the inventor found in practice that when the acousto-magnetic anti-theft tag is torn off from the base paper, if the tearing speed is too high and the tag cannot be torn off completely along the width direction, the tag can be twisted diagonally to different degrees (as in the case of twisting twist and towel, namely, the two ends of the tag are respectively subjected to opposite twisting forces so as to twist the tag around the axis in the length direction, particularly referring to fig. 1), or one end of the tag is fixed and the other end of the tag is subjected to twisting forces so as to twist the tag around the axis because the base adhesive of the tag is very sticky and the plastic shell of the tag is easy to deform. The inventor finds that when the bias sheet is also twisted diagonally due to the diagonal twisting of the acousto-magnetic anti-theft tag, the twisting has a relatively large influence on the magnetic field performance of the bias sheet in the prior art, and even if the bias sheet has slight twisting, the bias sheet has a relatively obvious demagnetizing phenomenon. The bias sheet is demagnetized to different degrees according to the amplitude of the diagonal torsion and the number of times of the diagonal torsion, and the greater the amplitude of the diagonal torsion is, the more serious the demagnetization of the bias sheet is, and the more the number of times of the diagonal torsion is, the more serious the demagnetization of the bias sheet is. When the bias magnetic field of the bias sheet is weakened due to demagnetization, the resonance frequency of the resonance sheet of the acoustic magnetic anti-theft tag is greatly changed (the change amplitude is generally increased by more than 0.5 kHz), so that the allowable error range of the resonance frequency of the acoustic magnetic anti-theft tag is exceeded (the allowable error range is generally within 0.5 kHz), and the resonance frequency of part of the acoustic magnetic anti-theft tag is not within the detection frequency range of the acoustic magnetic anti-theft system any more and cannot work normally, for example: if the detection window of the resonance frequency of the acoustic magnetic anti-theft tag is 57.5kHz-58.5kHz, the distribution of the resonance frequency is 57.7kHz-58.3 kHz in actual operation, so that after the acoustic magnetic anti-theft tag is diagonally twisted, the resonance frequency can rise by 0.5kHz, and the resonance frequency of the part of the tag which is originally 58.1-58.3kHz is no longer in the detection frequency range of the acoustic magnetic anti-theft system, so that the alarm performance is invalid.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an acoustic-magnetic anti-theft tag and a bias sheet thereof, which can effectively avoid the increase of the resonant frequency of the acoustic-magnetic anti-theft tag after diagonal torsion by using the acoustic-magnetic anti-theft tag made of a bias sheet which is narrower and has a better material, thereby greatly improving the capability of the tag to resist mechanical damage.
In order to achieve the above object, an embodiment of the present invention provides a bias sheet for an acoustic-magnetic anti-theft tag, the bias sheet being made of a material having a manganese content of 10 to 14wt%, at least one transition group metal content of not more than 7wt% in total, and the balance being iron, the bias sheet having a remanence of 12000Gs or more, the bias sheet having a width of 1.5 to 3.8mm; wherein the transition group metal does not include manganese and iron.
As a modification of the scheme, the width of the offset sheet is 1.8-3.2mm.
As a modification of the above, the length of the bias plate is 25-38mm.
As a modification of the scheme, the thickness of the offset sheet is 0.065-0.18mm.
As an improvement of the scheme, the bias sheet is manufactured by cutting an alloy strip containing 10-14wt% of manganese, at least one transition metal with the total content not exceeding 7wt% and the balance of iron after the prior cold rolling is subjected to annealing treatment for more than 5 minutes and less than 600 ℃.
Another embodiment of the present invention provides an acoustic-magnetic anti-theft tag, including a case, at least one resonant sheet, and a bias sheet according to any of the above schemes; the box body is internally provided with a resonant cavity, the at least one resonant sheet and the offset sheet are arranged in the resonant cavity, and the offset sheet and the at least one resonant sheet are arranged in a layered manner.
Another embodiment of the present invention provides an acoustic-magnetic anti-theft tag, which includes a case, at least one resonant piece, and a bias piece according to any of the above schemes; the box body is internally provided with a resonant cavity, and the at least one resonant sheet is arranged in the resonant cavity; wherein,
The offset sheet is arranged in the box body, is positioned outside the resonant cavity and is arranged in a layered manner with the at least one resonant sheet; the volume in the box body is larger than the occupied space of the resonant cavity;
Or, the offset sheet is arranged on the outer surface of the box body and is arranged in a layered manner with the at least one resonant sheet.
As an improvement of the scheme, after the acoustic-magnetic anti-theft tag is twisted for at least one time with a torsion angle larger than 15 degrees and is restored to a straight state, the rising amplitude of the resonance frequency is smaller than or equal to 0.3kHz.
As an improvement to the above, the twist is in the form of a diagonal twist.
As an improvement of the scheme, the resonance frequency of the acousto-magnetic anti-theft label before torsion is 57.5kHz-58.5 kHz.
Compared with the prior art, the acousto-magnetic anti-theft tag and the offset sheet thereof provided by the invention have the following beneficial effects:
The bias sheet of the acousto-magnetic anti-theft tag is made of a material containing 10-14wt% of manganese, not more than 7wt% of at least one transition group metal except manganese and iron, and the balance of iron, so that the coercive force of the bias sheet is not high or low and is moderate (preferably 15-45 Oe), the remanence of the bias sheet is large, and compared with the prior art, the width of the bias sheet can be made smaller (the coercive force is high, the larger the remanence is, the stronger the magnetic field generated by the bias sheet is, and the size of the bias sheet can be made smaller under the condition of ensuring the stronger magnetic field). And the inventors have conducted intensive studies to find that when the width of the bias sheet is 1.5-3.8mm, even if diagonal torsion occurs in the bias sheet, the bias magnetic field generated by the bias sheet after being restored to a flat state is not significantly different from the bias magnetic field generated before diagonal torsion, and does not weaken to a large extent. Therefore, even if the bias sheet is twisted diagonally by external force, the generated bias magnetic field does not cause larger change of the resonance frequency of the acoustic magnetic anti-theft label, so that the acoustic magnetic anti-theft label can effectively avoid rising of the resonance frequency after the diagonal twisting, and the mechanical damage resistance of the acoustic magnetic anti-theft label is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a state of an acousto-magnetic anti-theft tag when diagonally folded;
FIG. 2 is a schematic structural diagram of a first acoustic-magnetic anti-theft tag according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second acoustic-magnetic anti-theft tag according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a third acoustic-magnetic anti-theft tag according to an embodiment of the present invention.
Reference numerals illustrate: 20. a case body; 21. a resonator plate; 22. a bias plate; 23. a resonant cavity; 24. a receiving chamber; 25, a partition board.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
Referring to fig. 2, an embodiment of the present invention provides an acoustic-magnetic anti-theft tag, which includes a case 20, at least one resonant piece 21, and a biasing piece 22; the box 20 is provided with a resonant cavity 23, the at least one resonant plate and the offset plate 22 are disposed in the resonant cavity 23, and the offset plate 22 and the at least one resonant plate 21 are arranged in a layered manner.
Wherein the bias sheet 22 is made of a material containing 10-14wt% of manganese, at least one transition group metal (the transition group metal does not include manganese and iron) in an amount of not more than 7wt% in total, and the balance being iron, the coercive force Hc of the bias sheet 22 is greater than 15Oe (preferably between 15-45 Oe), the remanence of the bias sheet 22 is greater than or equal to 12000Gs, and the width of the bias sheet 22 is 1.5-3.8mm.
The embodiment of the invention has the following beneficial effects:
The bias sheet 22 of the acousto-magnetic anti-theft tag of the embodiment of the present invention is made of a material having manganese content of 10-14wt%, at least one transition group metal other than manganese and iron, and the balance being iron, the sum of the contents not exceeding 7 wt%. The bias plate 22 has a moderate coercivity (preferably 15-45 Oe) and a higher remanence (12000 Gs), and the width of the bias plate 22 can be made smaller (less than 4.5-6 mm) than in the prior art. And the inventors have conducted intensive studies to find that when the width of the bias sheet 22 is 1.5 to 3.8mm, the bias sheet 22 is returned to a straight state even after diagonal torsion, and the difference between the generated bias magnetic field and the bias magnetic field generated before torsion is not obvious, and no great weakening occurs. Therefore, even if the bias sheet 22 is diagonally twisted by an external force at a twist angle of 15 degrees or more, the generated bias magnetic field does not cause a large change in the resonance frequency of the acoustic-magnetic anti-theft tag (the resonance frequency change is less than 0.5kHz, for example, refer to table 2 below), so that the acoustic-magnetic anti-theft tag can effectively avoid the increase in the resonance frequency after the diagonal twist, thereby greatly improving the mechanical damage resistance of the acoustic-magnetic anti-theft tag.
The torsion angle means: when the acousto-magnetic anti-theft tag is twisted, the twisted position of the torsion-exerting part of the acousto-magnetic anti-theft tag is rotated by an included angle relative to the position before twisting.
The bias plate 22 may be disposed in the resonant cavity 23 in the following manner: the biasing piece 22 is located in the resonant cavity 23 and fixed to the inner side wall of the case 20, so that when the case 20 is deformed in torsion, the biasing piece 22 is deformed in torsion; or the bias piece 22 is only located in the resonant cavity 23 and is not fixed, so that as long as the box body 20 does not generate large torsional deformation, the bias piece 22 can not be subjected to torsional deformation, and the influence of the torsional deformation of the box body 20 on the magnetic field performance of the bias piece 22 is avoided.
In order to facilitate understanding of embodiments of the present invention, the following more detailed description of embodiments of the present invention is provided herein:
in the embodiment of the present invention, the biasing piece 22 is preferably in a wave-like structure, which is advantageous in improving the resistance of the biasing piece 22 against torsional deformation.
In this embodiment of the present invention, preferably, the width of the bias sheet 22 is 1.8-3.2mm, so that the bias magnetic field generated by the bias sheet 22 is smaller than the bias magnetic field generated before torsion under the condition that the length and thickness of the bias sheet 22 are set, so that the variation amplitude of the resonance frequency of the resonance sheet 21 is small (the variation of the resonance frequency is smaller than 0.3 kHz, for example, please refer to table 2 below) even if the bias sheet 22 is twisted diagonally by an external force, thereby ensuring the normal operation of the acoustic-magnetic anti-theft tag.
In the above embodiment of the invention, the length of the biasing piece 22 is preferably 25-38mm. Further, the thickness of the biasing sheet 22 is preferably 0.065-0.18mm. Of course, since the variation of the length and thickness of the bias sheet 22 does not have a significant effect on the magnetic field performance of the bias sheet 22 after torsion, the length and thickness of the bias sheet 22 may take other values according to the actual situation, and are not particularly limited herein.
In the above embodiment of the invention, the bias sheet 22 is specifically made of an alloy strip containing 10 to 14wt% of manganese, at least one transition metal in an amount not exceeding 7wt% in total, and the balance iron, and is manufactured by performing a prior cold rolling, followed by an annealing treatment for more than 5 minutes and less than 600 c, and then cutting. The bias sheet 22 is manufactured by the process provided by the embodiment of the invention, so that the coercive force of the bias sheet 22 is 15-45Oe, and the remanence is 12000-13200Gs, thereby being beneficial to improving the anti-demagnetizing capability of the bias sheet 22.
More specifically, the bias plate 22 (specifically, the alloy strip) is preferably made of: manganese content of 12.1 wt%, chromium content of 0.05% by weight, balance iron; or 12.8wt% manganese, 1.1wt% nickel, 0.05wt% chromium, the balance being iron; or 10.5 wt% of manganese, 1.1% of molybdenum, 0.05% of chromium, 0.3% of titanium and the balance of iron.
Illustratively, when the materials of the bias sheet 22 (specifically, the alloy strip) are the above three, the composition and the processing process of the bias sheet 22 are the following three:
(1) Smelting alloy material (12.1 wt% Mn, 0.05wt% Cr and balance Fe), casting, hot forging and hot rolling to 5mm to obtain alloy strip, eliminating surface oxide layer, re-rolling to 0.5mm thickness, fast softening at 850 deg.c single phase area to prevent excessive oxidation, cold rolling to 0.065-0.18mm thickness in a roll mill, annealing at 600 deg.c for over 5min, shearing to 1.5-3.8mm wide coil, and shearing to form bias sheet 22 with 5-38mm length in a high speed shearing machine.
(2) Smelting alloy material (12.8wt% Mn, 1.1wt% Ni, 0.05 wt% Cr and balance Fe), casting, hot forging and hot rolling to 5mm to obtain alloy strip, removing surface, hot rolling to 0.5mm thickness, rapid softening at 850 deg.C single-phase zone, directly cold rolling to 0.065-0.18mm thickness by a rolling mill, annealing for more than 5min and less than 600 deg.C, slitting to 1.5-3.8 mm wide coil, and shearing the coil to 5-38mm long bias piece 22 by a high speed shearing machine.
(3) Smelting alloy material (10.5 wt% Mn, 1.1wt% Mo, 0.05wt% Cr, 0.3wt% Ti and the rest being Fe), casting ingot, hot forging and hot rolling to 5mm to obtain alloy strip, eliminating surface, cold rolling to 0.065-0.18mm thickness, annealing for over 5min and below 600 deg.c, trimming to 1.5-3.8mm width, and trimming to 5-38mm length bias sheet 22.
Wherein, the typical parameters of the magnetic properties of the bias sheet 22 obtained by the above three components and processing technique are shown in the following table 1:
Table 1: three components and a typical parameter table of magnetic properties of the bias sheet 22 obtained by the processing technology
| Composition and process | Hc(Oe) | Br(Gs) |
| 1 | 32 | 12800 |
| 2 | 22 | 13200 |
| 3 | 43 | 12000 |
From table 1, it can be derived that: the components provided by the embodiment of the invention can be used for processing the bias sheet 22 with moderate coercive force and high remanence through the three processing processes, thereby being beneficial to improving the demagnetizing resistance of the bias sheet 22.
In the above embodiment of the invention, the resonant frequency of the acousto-magnetic anti-theft tag is raised by 0.3kHz or less (for example, refer to table 2 below) after being twisted diagonally at least once by a twist angle of more than 15 degrees and returned to a flat state.
In the embodiment of the invention, specifically, the resonance frequency of the acousto-magnetic anti-theft tag before torsion is 57.5 kHz-58.5kHz.
In the above embodiments, in combination, the bias sheet 22 and the acousto-magnetic anti-theft tag according to the embodiments of the present invention have: the size is narrowed, the rise of the resonance frequency after diagonal torsion can be effectively avoided, and the mechanical damage resistance is improved. In order to prove that the resonant frequency of the acousto-magnetic anti-theft tag provided by the embodiment of the invention is not obviously increased by Δf after being subjected to diagonal torsion (Δf is less than or equal to 0.5KHz is used as a judgment standard), the following test data table is provided:
Table 2: test meter for changing resonance frequency of diagonally twisted acousto-magnetic anti-theft tag
Referring to Table 2, the bias sheet 22 (preferably comprising 12wt% manganese, 0.05wt% chromium and balance iron) has a thickness of 0.085mm and a length of 28-35mm (the length and thickness of the bias sheet 22 have little effect on the magnetic field stability of the bias sheet of the tag, as is common knowledge in the art), a remanence of about 12800Gs, and a diagonal twist with a twist angle of greater than 15 degrees. As can be seen from table 2, when the width of the bias sheet 22 is relatively narrow, the resonant frequency of the acousto-magnetic anti-theft tag is significantly reduced by the increase in the resonant frequency after the tag is diagonally twisted. When the width is 1.8-3.2mm, the rising amplitude of the resonance frequency of the acousto-magnetic anti-theft tag after multiple diagonal twists is smaller than 0.5kHz.
Embodiment two:
An embodiment of the present invention provides another acoustic-magnetic anti-theft tag, please refer to fig. 3, which mainly includes the following differences from the acoustic-magnetic anti-theft tag of the first embodiment: the bias plate 22 is disposed in the case 20 and outside the resonant cavity 23, and is arranged in a layered manner with the at least one resonant plate 21; the volume in the case 20 is larger than the occupied space of the resonant cavity 23. That is, the space in the box 20 is divided into at least two parts, for example, in fig. 3, a partition 25 is disposed in the box 20 to divide the inner space of the box 20 into a resonant cavity 23 and a containing cavity 24, and the biasing piece 22 is disposed in the containing cavity 24, so that the overall structure of the box 20 is more stable and has better rigidity, and the acousto-magnetic anti-theft tag is not easy to generate torsional deformation, thereby more effectively avoiding the influence of diagonal torsion on the resonant frequency of the tag, and greatly improving the mechanical damage resistance of the tag. It should be noted that, the bias plate 22 may be disposed in the accommodating cavity 24 in the following manner: the biasing piece 22 is positioned in the accommodating cavity 24 and is fixed with the inner side wall of the box body 20; or the biasing tab 22 is simply located within the receiving cavity 24 and is not stationary.
Embodiment III:
The embodiment of the present invention provides another acoustic-magnetic anti-theft tag, please refer to fig. 4, which mainly differs from the acoustic-magnetic anti-theft tag of the first embodiment in that: the bias plate 22 is disposed on an outer surface of the case 20 (e.g., disposed at a bottom portion outside the case 20), and is arranged in a layer with the at least one resonator plate 21. This facilitates replacement of the biasing piece 22 when the biasing piece 22 is damaged due to torsional deformation.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A bias sheet for an acousto-magnetic anti-theft tag, the bias sheet being made of a material having a manganese content of 10-14 wt%, at least one transition group metal having a total content of no more than 7 wt%, and the balance being iron, the bias sheet having a remanence of greater than or equal to 12000 Gs, the bias sheet having a width of 1.5-3.8 mm; wherein the transition group metal does not include manganese and iron; after the bias sheet is subjected to external force and is diagonally twisted at a torsion angle of more than 15 degrees, the amplitude of the resonance frequency change of the acousto-magnetic anti-theft tag is smaller than 0.5kHz due to the bias magnetic field generated by the bias sheet; the length of the offset sheet is 25-38 mm; the bias sheet is made of an alloy strip containing 10-14 wt% manganese, at least one transition metal with a total content of no more than 7 wt% and the balance iron, which is produced by a preceding cold rolling followed by an annealing treatment for more than 5 minutes and less than 600 ℃ and then cutting.
2. The bias sheet for an acoustic magnetic security tag of claim 1 wherein said bias sheet has a width of 1.8-3.2 mm.
3. The bias sheet for an acoustic magnetic security tag of claim 1 wherein said bias sheet has a thickness of 0.065-0.18mm.
4. An acousto-magnetic anti-theft tag comprising a case, at least one resonant panel and a bias panel according to any one of claims 1 to 3; the box body is internally provided with a resonant cavity, the at least one resonant sheet and the offset sheet are arranged in the resonant cavity, and the offset sheet and the at least one resonant sheet are arranged in a layered manner.
5. An acousto-magnetic anti-theft tag comprising a case, at least one resonant panel and a bias panel according to any one of claims 1 to 3; the box body is internally provided with a resonant cavity, and the at least one resonant sheet is arranged in the resonant cavity; wherein,
The offset sheet is arranged in the box body, is positioned outside the resonant cavity and is arranged in a layered manner with the at least one resonant sheet; the volume in the box body is larger than the occupied space of the resonant cavity;
Or, the offset sheet is arranged on the outer surface of the box body and is arranged in a layered manner with the at least one resonant sheet.
6. The acousto-magnetic security tag according to claim 5, wherein the rising amplitude of the resonance frequency of said acousto-magnetic security tag is less than or equal to 0.3 kHz after at least one twist of an angle greater than 15 degrees and return to a flat state.
7. The acousto-magnetic security tag of claim 6 wherein the twist is in the form of a diagonal twist.
8. The acousto-magnetic security tag of any of claims 5 to 7, wherein the resonant frequency of said acousto-magnetic security tag before diagonal twisting is 57.5 kHz-58.5 kHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810626347.5A CN108564754B (en) | 2018-06-15 | 2018-06-15 | Acoustic-magnetic anti-theft tag and offset sheet thereof |
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| CN201810626347.5A CN108564754B (en) | 2018-06-15 | 2018-06-15 | Acoustic-magnetic anti-theft tag and offset sheet thereof |
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| CN108564754B true CN108564754B (en) | 2024-06-04 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109697817A (en) * | 2019-01-16 | 2019-04-30 | 广州齐达材料科技有限公司 | Sound Magnetic Sensor |
| CN110599725A (en) * | 2019-09-27 | 2019-12-20 | 宁波讯强电子科技有限公司 | Acoustomagnetic anti-theft label |
| CN118906591A (en) * | 2021-05-28 | 2024-11-08 | 宁波讯强电子科技有限公司 | Regenerated PS plastic film, sound magnetic anti-theft label, label shell and preparation method thereof |
| CN116935556A (en) * | 2022-04-02 | 2023-10-24 | 宁波讯强电子科技有限公司 | Acoustic-magnetic anti-theft tag and application thereof |
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