CN108564754A - A kind of acoustic magnetic anti-theft label and its bias slice - Google Patents
A kind of acoustic magnetic anti-theft label and its bias slice Download PDFInfo
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- CN108564754A CN108564754A CN201810626347.5A CN201810626347A CN108564754A CN 108564754 A CN108564754 A CN 108564754A CN 201810626347 A CN201810626347 A CN 201810626347A CN 108564754 A CN108564754 A CN 108564754A
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- sheet
- bias
- theft tag
- acoustic
- theft
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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
本发明公开了一种声磁防盗标签及其偏置片，其中，公开的所述用于声磁防盗标签的偏置片由含量为10‑14wt％的锰、含量总和不超过7wt％的至少一种过渡族金属且余量为铁的材料制成，所述偏置片的剩磁大于12000Gs，所述偏置片的宽度为1.5‑3.8mm；其中，所述过渡族金属不包括锰与铁。本发明通过使用变窄的且材料更优的偏置片制成的声磁防盗标签，能够有效避免对角扭转后声磁防盗标签的共振频率升高，从而大大提高了该标签抗机械破坏的能力。
The invention discloses an acoustomagnetic anti-theft label and a bias sheet thereof, wherein the disclosed bias sheet for the acoustomagnetic anti-theft label consists of manganese with a content of 10-14wt%, and at least It is made of a transition metal and the balance is iron, the remanence of the bias plate is greater than 12000Gs, and the width of the bias plate is 1.5-3.8mm; wherein, the transition metal does not include manganese and iron. The present invention uses the acoustomagnetic anti-theft tag made of a narrower and better material bias sheet, which can effectively avoid the increase of the resonant frequency of the acoustomagnetic anti-theft tag after diagonally twisted, thereby greatly improving the mechanical damage resistance of the tag ability.
Description
Technical Field
The invention relates to the technical field of acoustic-magnetic anti-theft, in particular to an acoustic-magnetic anti-theft tag and a bias sheet thereof.
Background
The acoustic-magnetic anti-theft system is widely used as one of electronic article anti-theft systems with its excellent performance. The specific working principle of the acoustic-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 resonant frequency of the acoustic-magnetic anti-theft tag is consistent with the carrier frequency in the alternating magnetic field, due to the magnetic-elastic resonance effect, a resonance sheet in the acoustic-magnetic anti-theft tag can generate a resonance signal under the action of the magnetic field provided by the biasing sheet and is received by the receiving antenna, and therefore the existence of the acoustic-magnetic anti-theft tag is detected. An acoustic-magnetic anti-theft system generally consists of two parts: the device comprises a detector comprising a transmitting antenna and a receiving antenna, wherein an alternating magnetic field is transmitted by the transmitting antenna, a detection induction area is formed between the transmitting antenna and the receiving antenna, whether an effective tag exists or not is searched in a specific range by using a magnetic-elastic resonance principle, and an alarm is triggered when the effective tag appears; the other is an acoustic-magnetic anti-theft label, which mainly comprises a resonance piece for generating magnetic-mechanical resonance and a bias piece for providing a bias magnetic field, wherein the resonance piece is accurately cut from an amorphous metal thin strip into a size with the resonance frequency of 58kHz under the action of the bias magnetic field provided by the bias piece, and the resonance piece can generate the magnetic-mechanical resonance in a detection area and reflect the magnetic-mechanical resonance to a receiving antenna.
The inventor finds that the following technical problems exist in the prior art in the process of implementing the invention:
when the existing rectangular acoustic-magnetic anti-theft tag is used, because the shell of the acoustic-magnetic anti-theft tag is a Plastic (PS) thin shell with certain deformation, the acoustic-magnetic anti-theft tag can be bent or bent frequently under the action of external force, but the performance of the acoustic-magnetic anti-theft tag cannot be obviously influenced by the bending or bending of the conventional rectangular acoustic-magnetic anti-theft tag. Therefore, when the acoustic magnetic anti-theft tag is bent or bent, the acoustic magnetic anti-theft tag can be normally used after being restored to a straight state.
However, the inventor finds in practice that when the acoustic-magnetic anti-theft tag is torn off from the base paper, if the tearing speed is too fast and the tag cannot be torn completely along the width direction, the tag may be twisted diagonally to different degrees (as in "twist and towel" in which two ends of the tag are twisted around its longitudinal axis by opposite twisting forces, as shown in fig. 1, or the tag is fixed at one end and twisted around the axis by the other end) because the base glue of the tag is sticky and the plastic shell of the tag is easily deformed. The inventor finds that when the acoustic-magnetic anti-theft tag is twisted diagonally to make the bias sheet also twisted diagonally, the twist can have a relatively large influence on the magnetic field performance of the bias sheet in the prior art, and even if the bias sheet is slightly twisted, the bias sheet can have a demagnetization phenomenon with a relatively obvious degree. The bias sheet has different degrees of demagnetization according to the amplitude of diagonal torsion and the number of the diagonal torsion, the larger the amplitude of the diagonal torsion is, the more serious the demagnetization of the bias sheet is, and the more the number 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 changes greatly (the change amplitude is generally the frequency rise above 0.5 kHz), which exceeds the allowable error range of the resonance frequency of the acoustic-magnetic anti-theft tag (the allowable error range is generally within 0.5 kHz), so that the resonance frequency of part of the acoustic-magnetic anti-theft tag is no longer within the detection frequency range of the acoustic-magnetic anti-theft system 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 during actual working is 57.7kHz-58.3 kHz, so that the resonance frequency can be increased by 0.5kHz after the acoustic magnetic anti-theft tag is twisted diagonally, and the resonance frequency of the part of the tag which is originally between 58.1 kHz and 58.3kHz is not in the detection frequency range of the acoustic magnetic anti-theft system any more, thereby 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, in which the acoustic-magnetic anti-theft tag made of the narrowed bias sheet with better material can effectively avoid the increase of the resonant frequency of the acoustic-magnetic anti-theft tag after the diagonal twisting, so as to greatly improve the mechanical damage resistance of the tag.
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 containing 10-14 wt% of manganese, at least one transition group metal in an amount not exceeding 7 wt% in total, and the balance being iron, the bias sheet having a remanence greater than or equal to 12000Gs, the bias sheet having a width of 1.5-3.8 mm; wherein the transition group metal does not include manganese and iron.
As an improvement of the scheme, the width of the offset sheet is 1.8-3.2 mm.
As an improvement of the scheme, the length of the offset sheet is 25-38 mm.
As an improvement of the scheme, the thickness of the offset sheet is 0.065-0.18 mm.
As an improvement of the scheme, the offset sheet is made of an alloy strip which contains 10-14 wt% of manganese, at least one transition metal with the total content not exceeding 7 wt% and the balance of iron, is subjected to cold rolling, then is subjected to annealing treatment for more than 5 minutes and less than 600 ℃, and then is cut.
Another embodiment of the invention provides an acoustic-magnetic anti-theft tag, which comprises a box body, at least one resonance sheet and the offset sheet in any scheme; the box body is internally provided with a resonant cavity, the at least one resonance sheet and the bias sheet are arranged in the resonant cavity, and the bias sheet and the at least one resonance sheet are arranged in a layered manner.
Another embodiment of the invention provides an acoustic-magnetic anti-theft tag, which comprises a box body, at least one resonance sheet and the offset sheet in any scheme; a resonant cavity is arranged in the box body, 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 resonance sheet.
As an improvement of the scheme, after the acoustic magnetic anti-theft tag is twisted for at least one time by a twisting angle larger than 15 degrees and is restored to a flat state, the rising amplitude of the resonant frequency of the acoustic magnetic anti-theft tag is smaller than or equal to 0.3 kHz.
As a modification of the above, the twist is in the form of a diagonal twist.
As an improvement of the scheme, the resonance frequency of the acoustic magnetic anti-theft label before torsion is 57.5kHz-58.5 kHz.
Compared with the prior art, the acoustic-magnetic anti-theft tag and the bias sheet thereof provided by the invention have the following beneficial effects:
the bias sheet of the acoustic-magnetic anti-theft tag is made of 10-14 wt% of manganese, at least one transition metal except manganese and iron, the total content of which is not more than 7 wt%, and the balance of which is iron, so that the coercive force of the bias sheet is not low and is moderate (preferably 15-45Oe), the residual magnetism of the bias sheet is large, and the width of the bias sheet can be made smaller compared with the width of the bias sheet in the prior art (the coercive force is high, the larger the residual magnetism 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 strong magnetic field). The inventor of the invention has conducted extensive research and found that when the width of the offset sheet is 1.5-3.8mm, even if the offset sheet is twisted diagonally, after the offset sheet is restored to a straight state, the difference between the generated bias magnetic field and the bias magnetic field generated before the diagonal twist is not obvious, and the offset sheet is not weakened to a large extent. Therefore, even if the offset sheet is diagonally twisted by an external force, the resonance frequency of the acoustic-magnetic anti-theft tag cannot be greatly changed by the generated offset magnetic field, so that the acoustic-magnetic anti-theft tag can effectively avoid the increase of the resonance frequency after the diagonal twisting, and the mechanical damage resistance of the acoustic-magnetic anti-theft tag is greatly improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used 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 it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the acoustic-magnetic anti-theft tag in a diagonally bent state;
FIG. 2 is a schematic structural diagram of a first acoustic-magnetic anti-theft tag provided in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second acoustic-magnetic anti-theft tag provided in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third acoustic-magnetic anti-theft tag provided in the embodiment of the present invention.
Description of reference numerals: 20. a box body; 21. a resonance plate; 22. a biasing sheet; 23. a resonant cavity; 24. an accommodating chamber; a separator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 2, an embodiment of the invention provides an acoustic-magnetic anti-theft tag, which includes a box 20, at least one resonant plate 21 and a bias plate 22; the box 20 is provided with a resonant cavity 23, the at least one resonator plate and the bias plate 22 are disposed in the resonant cavity 23, and the bias plate 22 and the at least one resonator plate 21 are arranged in a layered manner.
Wherein the bias sheet 22 is made of a material containing 10-14 wt% of manganese, at least one transition group metal (the transition group metal does not include manganese and iron) with the total content not exceeding 7 wt%, and the balance being iron, the coercive force Hc of the bias sheet 22 is greater than 15Oe (preferably between 15-45Oe), the remanence of the bias sheet 22 is greater than or equal to 12000Gs, and the width of the bias sheet 22 is 1.5-3.8 mm.
The embodiment of the invention has the following beneficial effects:
the bias sheet 22 of the acoustic-magnetic anti-theft tag of the embodiment of the present invention is made of a material containing 10-14 wt% of manganese, at least one transition group metal other than manganese and iron, and the balance iron, the sum of the contents of which is not more than 7 wt%. The coercivity of the bias sheet 22 is moderate (preferably 15-45Oe) and the remanence is high (12000 Gs), and the width of the bias sheet 22 can be made smaller (less than 4.5-6mm) than in the prior art. The inventor of the present invention has conducted extensive studies and found that when the width of the offset plate 22 is 1.5-3.8mm, even if the offset plate 22 is twisted diagonally and then returns to a flat state, the difference between the generated bias magnetic field and the bias magnetic field generated before twisting is not significant, and the bias magnetic field is not weakened to a large extent. Therefore, even if the bias sheet 22 is twisted diagonally by an external force at a twisting angle of more than 15 degrees, the generated bias magnetic field does not change the resonance frequency of the acoustic-magnetic anti-theft tag greatly (the resonance frequency change is less than 0.5kHz, for example, please refer to table 2 below), so that the acoustic-magnetic anti-theft tag can effectively avoid the increase of the resonance frequency after the diagonal twisting, and the capability of the acoustic-magnetic anti-theft tag against mechanical damage is greatly improved.
Note that the torsion angle means: when the acoustic magnetic anti-theft label is twisted, the twisted position of the force applying and twisting part of the acoustic magnetic anti-theft label is relative to the twisted position to form an included angle.
In addition, the arrangement manner of the biasing piece 22 in the resonant cavity 23 may be as follows: the offset plate 22 is located in the resonant cavity 23 and fixed to the inner sidewall of the box 20, so that when the box 20 is deformed, the offset plate 22 is also deformed; or the biasing plate 22 is located only in the resonant cavity 23 and is not fixed, so that the biasing plate 22 can not be subjected to torsional deformation as long as the cartridge 20 is not subjected to large torsional deformation, thereby avoiding the influence of the torsional deformation of the cartridge 20 on the magnetic field performance of the biasing plate 22.
To facilitate an understanding of the embodiments of the present invention, the following more detailed description of the embodiments of the present invention is presented:
in the embodiment of the present invention, it is preferable that the biasing sheet 22 has a wave-like structure, which is advantageous to improve the resistance of the biasing sheet 22 against torsional deformation.
In the embodiment of the present invention, preferably, the width of the bias sheet 22 is 1.8-3.2mm, so that when the length and the thickness of the bias sheet 22 are both set, the difference between the bias magnetic field generated by the bias sheet 22 and the bias magnetic field generated before twisting is smaller, and thus even if the bias sheet 22 is twisted diagonally by an external force, the variation amplitude of the resonance frequency of the resonance sheet 21 is small (the variation of the resonance frequency is less than 0.3kHz, for example, please refer to table 2 below), thereby ensuring the normal operation of the acoustic magnetic anti-theft tag.
In the above-mentioned embodiment of the invention, preferably, the length of the offset sheet 22 is 25-38 mm. Further, it is preferable that the thickness of the offset plate 22 is 0.065 to 0.18 mm. Of course, since the length and thickness of the offset plate 22 vary without significantly affecting the magnetic field performance of the offset plate 22 after twisting, the length and thickness of the offset plate 22 may also take other values according to the actual situation, and are not limited herein.
In the above-described embodiment of the invention, the offset sheet 22 is made of an alloy strip containing 10 to 14 wt% of manganese, at least one transition metal in an amount not exceeding 7 wt% in total, and the balance being iron, and is first cold-rolled and then subjected to an annealing treatment at a temperature of less than 600 ℃ for more than 5 minutes, and then trimmed. The bias sheet 22 is prepared 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 demagnetization resistance of the bias sheet 22.
More specifically, the material of the offset piece 22 (specifically, the alloy strip) is preferably: manganese with the content of 12.1 wt%, chromium with the content of 0.05 wt% and the balance of iron; or manganese with the content of 12.8 wt%, nickel with the content of 1.1 wt%, chromium with the content of 0.05 wt% and the balance of iron; or 10.5 wt% of manganese, 1.1 wt% of molybdenum, 0.05 wt% of chromium, 0.3 wt% of titanium and the balance of iron.
Illustratively, when the material of the offset sheet 22 (specifically, the alloy strip) is the above three, the composition and the processing technology of the offset sheet 22 are the following three correspondingly:
(1) the alloy material (manganese with the content of 12.1 wt%, chromium with the content of 0.05 wt% and iron with the balance) is smelted, cast into a ingot, hot forged and hot rolled to 5mm to form an alloy strip, the surface oxide layer is removed, the alloy strip is then rolled to the thickness of 0.5mm, the single-phase region at 850 ℃ is rapidly softened to prevent excessive oxidation, then the alloy strip is directly cold rolled to the thickness of 0.065-0.18mm by a rolling mill, annealed for more than 5 minutes and less than 600 ℃, longitudinally cut into different coils with the width of 1.5-3.8mm, and then the coils are cut into offset pieces 22 with the length of 5-38mm by a high-speed shearing machine.
(2) The alloy material (manganese with the content of 12.8 wt%, nickel with the content of 1.1 wt%, chromium with the content of 0.05 wt% and iron with the balance) is smelted, cast into a ingot, hot forged and hot rolled to 5mm to form an alloy strip, the surface of the alloy strip is removed, the alloy strip is then rolled to the thickness of 0.5mm, the single-phase region at 850 ℃ is subjected to rapid softening treatment, then the alloy strip is directly cold rolled to the thickness of 0.065-0.18mm by a rolling mill, annealed for more than 5 minutes and less than 600 ℃, longitudinally cut into different coils with the width of 1.5-3.8mm, and then the coils are cut into offset pieces 22 with the length of 5-38mm by a high-speed shearing machine.
(3) An alloy material (manganese with the content of 10.5 wt%, molybdenum with the content of 1.1 wt%, chromium with the content of 0.05 wt%, titanium with the content of 0.3 wt% and the balance iron) is smelted, cast into a ingot, hot forged and hot rolled to 5mm to form an alloy strip, the surface of the alloy strip is removed, the alloy strip is rolled to the thickness of 0.5mm, the alloy strip is quickly softened in a single phase zone at 850 ℃, then the alloy strip is directly cold rolled to the thickness of 0.065-0.18mm by a rolling mill, annealed for more than 5 minutes and less than 600 ℃, longitudinally cut into different coils with the width of 1.5-3.8mm, and then the coils are cut into offset pieces 22 with the length of 5-38mm by a high-speed shearing machine.
Typical parameters of the magnetic properties of the bias sheet 22 obtained by the above three components and processing techniques are shown in table 1 below:
table 1: typical parameter table of magnetic properties of the bias sheet 22 for three components and process
| Compositions and processes | Hc(Oe) | Br(Gs) |
| 1 | 32 | 12800 |
| 2 | 22 | 13200 |
| 3 | 43 | 12000 |
From table 1, it can be seen that: according to the components provided by the embodiment of the invention, the bias sheet 22 with moderate coercive force and high remanence can be processed by the three processing technologies, and the demagnetization resistance of the bias sheet 22 can be improved.
In the above embodiment of the invention, for example, after the acoustic magnetic anti-theft tag is twisted at least once with a twist angle greater than 15 degrees and returns to a flat state, the rising amplitude of the resonant frequency of the acoustic magnetic anti-theft tag is less than or equal to 0.3kHz (for example, see table 2 below).
In the embodiment of the invention, specifically, the resonance frequency of the acoustic magnetic anti-theft tag before torsion is 57.5kHz-58.5 kHz.
In the above embodiments, in summary, the bias sheet 22 and the acoustic-magnetic anti-theft tag provided in the embodiments of the present invention include: the size is narrowed, the increase of the resonance frequency after the diagonal torsion can be effectively avoided, and the capability of resisting mechanical damage is improved. In order to prove that the increase amplitude delta f of the resonant frequency of the acoustic-magnetic anti-theft tag provided by the embodiment of the invention is not obvious after the tag is subjected to diagonal torsion (delta f is less than or equal to 0.5KHz is taken as a judgment standard), the following test data table is provided:
table 2: resonance frequency change test meter of acoustic magnetic anti-theft label through diagonal torsion
Referring to table 2, the bias plate 22 (preferably 12 wt% mn, 0.05 wt% cr, and the balance fe) has a thickness of 0.085mm and a length of 28-35 mm (the length and thickness of the bias plate 22 do not affect the magnetic field stability of the bias plate of the tag much, as is common knowledge in the art), and has a remanence of about 12800Gs, which is twisted at an angle greater than 15 degrees. As can be seen from table 2, when the width of the offset sheet 22 is relatively narrow, the increase of the resonant frequency of the acoustic magnetic anti-theft tag after diagonal twisting is significantly reduced. When the width is 1.8-3.2mm, the resonance frequency of the acoustic magnetic anti-theft tag is increased by less than 0.5kHz after the acoustic magnetic anti-theft tag is twisted diagonally for many times.
Example two:
the embodiment of the present invention provides another acoustic-magnetic anti-theft tag, please refer to fig. 3, which is different from the acoustic-magnetic anti-theft tag of the first embodiment mainly in that: the offset plate 22 is disposed in the box body 20 and located outside the resonant cavity 23, and is layered with the at least one resonant plate 21; the volume inside the box 20 is larger than the occupied space of the resonance chamber 23. That is, the space inside the box 20 is divided into at least two parts, for example, in fig. 3, a partition 25 is arranged inside the box 20 to divide the internal space of the box 20 into a resonant cavity 23 and an accommodating cavity 24, and the biasing piece 22 is arranged in the accommodating cavity 24, so that the overall structure of the box 20 is more stable and rigid, the acoustic magnetic anti-theft tag is not easily twisted and deformed, the influence of the diagonal twist on the resonant frequency of the tag can be more effectively avoided, and the mechanical damage resistance of the tag is greatly improved. It should be noted that, the arrangement manner of the offset plate 22 in the accommodating cavity 24 may be: the offset piece 22 is positioned in the accommodating cavity 24 and fixed with the inner side wall of the box body 20; or the biasing member 22 is simply located within the receiving cavity 24 and is not fixed.
Example three:
the embodiment of the present invention provides another acoustic-magnetic anti-theft tag, please refer to fig. 4, which is different from the acoustic-magnetic anti-theft tag of the first embodiment mainly in that: the offset plate 22 is disposed on an outer surface of the case 20 (e.g., disposed at a bottom outside the case 20), and is layered with the at least one resonant plate 21. This facilitates replacement of the biasing piece 22 when the biasing piece 22 is damaged due to torsional deformation.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
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Cited By (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 |
| WO2023186160A1 (en) * | 2022-04-02 | 2023-10-05 | Ningbo Signatronic Technologies , Ltd. | Acousto-magnetic (am) anti-theft marker and use thereof |
| 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 |
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| 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 |
| WO2023186160A1 (en) * | 2022-04-02 | 2023-10-05 | Ningbo Signatronic Technologies , Ltd. | Acousto-magnetic (am) anti-theft marker and use thereof |
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