CN219145590U - Magnetic boosting magnetic circuit system and loudspeaker - Google Patents
Magnetic boosting magnetic circuit system and loudspeaker Download PDFInfo
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- CN219145590U CN219145590U CN202222919919.3U CN202222919919U CN219145590U CN 219145590 U CN219145590 U CN 219145590U CN 202222919919 U CN202222919919 U CN 202222919919U CN 219145590 U CN219145590 U CN 219145590U
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Abstract
The utility model provides a magnetic boosting magnetic circuit system, which comprises: the magnetic circuit assembly comprises a yoke and magnetic steel arranged on the first side of the yoke; a magnetic boost assembly disposed on the second side of the yoke; the magnetic boosting assembly comprises a central magnetic steel and side magnetic steels arranged around the central magnetic steel; the magnetic pole direction of the magnetic steel is the same as the magnetic pole direction of the central magnetic steel, and the magnetic pole direction of the side magnetic steel changes along with the magnetic pole direction of the magnetic steel; the magnetic flux of the magnetic circuit system is increased while the volume of the loudspeaker is reduced, and the force factor of the loudspeaker is improved, so that the performance of the loudspeaker is improved.
Description
Technical Field
The utility model relates to the technical field of speakers, in particular to a magnetic boosting magnetic circuit system and a speaker.
Background
At present, as the requirements of consumers on a mobile phone speaker are higher and higher, the size of the speaker is smaller and smaller, but the requirements on the amplitude are larger and larger, a magnetic circuit system is used as a core driving force for sounding the speaker, and how to effectively improve the voice coil force factor BL is an important product development idea.
The development trend of the micro-speaker is that the volume is smaller and the amplitude is larger, which puts higher and higher requirements on the materials and structure of the speaker, and the space utilization rate needs to be improved as much as possible, but the heat dissipation and the power consumption of the power-on coil are required to be reduced, so as to improve the endurance of the whole machine. The trade-offs among these are closely related to the performance index of the speaker product and the development process.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: the magnetic boosting magnetic circuit system and the loudspeaker are provided, and the force factor of the loudspeaker is improved while the volume of the loudspeaker is reduced, so that the performance of the loudspeaker is improved.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a magnetic boost circuit system comprising:
the magnetic circuit assembly comprises a yoke and magnetic steel arranged on the first side of the yoke;
a magnetic boost assembly disposed on the second side of the yoke;
the magnetic boosting assembly comprises a central magnetic steel and side magnetic steels arranged around the central magnetic steel;
the magnetic pole direction of the magnetic steel is the same as that of the central magnetic steel, and the magnetic pole direction of the side magnetic steel changes along with the magnetic pole direction of the magnetic steel.
In order to solve the technical problems, the utility model adopts another technical scheme that:
a magnetic boosting loudspeaker comprises the magnetic boosting magnetic circuit system.
The utility model has the beneficial effects that: the magnetic flux of the magnetic circuit in the magnetic circuit assembly is provided by the magnetic steel, the air forms a passage of the magnetic circuit, the magnetic boosting assembly is arranged on one side of the yoke without changing the structure of the magnetic circuit assembly, and the magnetic poles of the magnetic steel and the central magnetic steel have the same direction, so that the magnetic flux generated by the magnetic circuit assembly is increased, and the magnetic flux in the passage of the magnetic circuit is increased. Meanwhile, the magnetic pole direction of the side magnetic steel of the magnetic boosting assembly is adapted to the magnetic pole direction of the magnetic steel, namely along the direction of magnetic force lines of the magnetic circuit assembly, magnetic fluxes provided by the side magnetic steel all enter a magnetic loop, and therefore the magnetic fluxes are increased for the magnetic circuit assembly by the center magnetic steel and the side magnetic steel, and the force factor BL of the loudspeaker is improved.
Drawings
FIG. 1 is a schematic diagram of a magnetic boosting circuit system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an array structure of a magnetic boosting magnetic circuit system according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a space coordinate system of a magnetic boosting magnetic circuit system according to an embodiment of the present utility model;
fig. 4 is a graph of force factors BL of a magnetic boosting speaker according to an embodiment of the present utility model and different boosting schemes in the prior art;
fig. 5 is a magnetic flux density cloud of a magnetic circuit of a speaker according to a conventional scheme of the prior art;
FIG. 6 is a magnetic flux density cloud of a prior art single magnetic scheme loudspeaker magnetic circuit;
FIG. 7 is a magnetic flux density cloud of a prior art speaker magnetic circuit for a profiled single magnetic scheme;
fig. 8 is a magnetic flux density cloud chart of a magnetic circuit of a magnetic boosting speaker according to an embodiment of the present utility model;
description of the reference numerals:
1. a magnetic circuit assembly; 2. a magnetic boosting assembly; 11. a yoke; 12. magnetic steel; 21. a center magnetic steel; 22. edge magnetic steel; 31. a Chinese sauce; 32. bian Huasi; 121. an inner magnetic steel; 122. an outer magnetic steel; 221. a first side magnetic steel; 222. a second side magnetic steel; 223. third side magnetic steel; 224. fourth magnetic steel.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, an embodiment of the present utility model provides a magnetic boosting magnetic circuit system, including:
the magnetic circuit assembly comprises a yoke and magnetic steel arranged on the first side of the yoke;
a magnetic boost assembly disposed on the second side of the yoke;
the magnetic boosting assembly comprises a central magnetic steel and side magnetic steels arranged around the central magnetic steel;
the magnetic pole direction of the magnetic steel is the same as that of the central magnetic steel, and the magnetic pole direction of the side magnetic steel changes along with the magnetic pole direction of the magnetic steel.
From the above description, the beneficial effects of the utility model are as follows: the magnetic flux of the magnetic circuit in the magnetic circuit assembly is provided by the magnetic steel, the air forms a passage of the magnetic circuit, the magnetic boosting assembly is arranged on one side of the yoke without changing the structure of the magnetic circuit assembly, and the magnetic poles of the magnetic steel and the central magnetic steel have the same direction, so that the magnetic flux generated by the magnetic circuit assembly is increased, and the magnetic flux in the passage of the magnetic circuit is increased. Meanwhile, the magnetic pole direction of the side magnetic steel of the magnetic boosting assembly is adapted to the magnetic pole direction of the magnetic steel, namely along the direction of magnetic force lines of the magnetic circuit assembly, magnetic fluxes provided by the side magnetic steel all enter a magnetic loop, and therefore the magnetic fluxes are increased for the magnetic circuit assembly by the center magnetic steel and the side magnetic steel, and the force factor BL of the loudspeaker is improved.
Further, the center magnetic steel and the side magnetic steel are arranged according to the halbach array.
From the above description, halbach array is a magnet structure with the goal of generating the strongest magnetic field with a minimum number of magnets, with a special arrangement of magnet units, to enhance field strength in one direction; the center magnetic steel and the side magnetic steel are arranged according to the halbach array, so that the magnetic boosting assembly occupies small volume, but the effect of increasing magnetic flux is obvious.
Further, the side magnetic steel comprises a first side magnetic steel, a second side magnetic steel, a third side magnetic steel and a fourth side magnetic steel; the first side magnetic steel, the second side magnetic steel, the third side magnetic steel and the fourth side magnetic steel are respectively arranged around the central magnetic steel.
As can be seen from the above description, in an alternative embodiment, the number of the side magnetic steels is 4, and the side magnetic steels are respectively disposed around the center magnetic steel, so that the amplitude of the BL curve of the speaker is improved without changing the structure of the magnetic circuit system, and the occupied volume is small.
Further, the center points of the magnetic steel and the center magnetic steel are positioned on the same straight line.
From the above description, the center points of the magnetic steel and the center magnetic steel are located on the same straight line, so that magnetic fields generated by the magnetic steel and the center magnetic steel can be overlapped to the greatest extent, and the magnetic flux provided by the center magnetic steel is prevented from shifting to influence the magnetic flux loop of the magnetic circuit assembly.
Further, the side magnetic steel is attached to the center magnetic steel.
From the above description, the closer the distance between the side magnetic steel and the center magnetic steel is, the more the magnetic fields are overlapped, and the larger the magnetic flux provided for the magnetic loop is, so as to achieve the best effect of improving the BL curve amplitude of the loudspeaker.
Further, the magnetic steel comprises inner magnetic steel and outer magnetic steel arranged around the inner magnetic steel, and the magnetic pole direction of the outer magnetic steel is opposite to the magnetic pole direction of the inner magnetic steel; the magnetic pole direction of the inner magnetic steel is the same as the magnetic pole direction of the central magnetic steel.
As is apparent from the above description, in order to significantly improve the magnetic flux of the magnetic circuit assembly, the magnetic circuit assembly is provided with an inner magnetic steel and an outer magnetic steel, the outer magnetic steel and the inner magnetic steel cooperate to provide more magnetic flux, and the magnetic pole directions of the outer magnetic steel and the inner magnetic steel are opposite, so that a passage of a magnetic loop is formed through air, and amplitude is generated by cooperation with the voice coil.
Furthermore, a gap is formed between the inner magnetic steel and the outer magnetic steel, and projections of the outer magnetic steel and the inner magnetic steel are located on the side magnetic steel.
From the above description, the gap between the inner magnetic steel and the outer magnetic steel is used for placing the voice coil, the gap is used for forming a passage of a magnetic loop through air, the side magnetic steel is arranged below the gap, and projections of the outer magnetic steel and the inner magnetic steel are both positioned on the side magnetic steel, which is equivalent to building a 'magnetic flux bridge' between the inner magnetic steel and the outer magnetic steel, so that the magnetic flux in the magnetic loop is improved.
Further, the magnetic circuit assembly is attached to the magnetic boosting assembly.
As can be seen from the above description, the magnetic boosting assembly and the magnetic circuit assembly may have a certain distance, but the further the distance is, the magnetic flux provided by the magnetic boosting assembly will be reduced, and when the two assemblies are attached, the shortest distance has the best effect of improving the force factor of the voice coil BL.
Further, the thickness of the center magnetic steel is the same as that of the side magnetic steel.
From the above description, the thickness of the two magnetic steels is the same, so that the magnetic flux provided by the side magnetic steel can be collected in the center magnetic steel to the greatest extent, and the magnetic steel density of the magnetic circuit is obviously improved.
Another embodiment of the present utility model provides a magnetically assisted speaker, including the magnetically assisted magnetic circuit system.
From the above description, the beneficial effects of the utility model are as follows: the magnetic flux of the magnetic circuit in the magnetic circuit assembly is provided by the magnetic steel, the air forms a passage of the magnetic circuit, the magnetic boosting assembly is arranged on one side of the yoke without changing the structure of the magnetic circuit assembly, and the magnetic poles of the magnetic steel and the central magnetic steel have the same direction, so that the magnetic flux generated by the magnetic circuit assembly is increased, and the magnetic flux in the passage of the magnetic circuit is increased. Meanwhile, the magnetic pole direction of the side magnetic steel of the magnetic boosting assembly is adapted to the magnetic pole direction of the magnetic steel, namely along the direction of magnetic force lines of the magnetic circuit assembly, magnetic fluxes provided by the side magnetic steel all enter a magnetic loop, and therefore the magnetic fluxes are increased for the magnetic circuit assembly by the center magnetic steel and the side magnetic steel, and the force factor BL of the loudspeaker is improved.
The embodiment of the utility model provides a magnetic boosting magnetic circuit system and a loudspeaker, which can be applied to external components including but not limited to folding screens, intelligent devices (VR/AR devices, intelligent glasses, intelligent watches and the like), wherein the magnetic boosting components can be matched with the original loudspeaker structure, the magnetic flux of the magnetic circuit system is increased while the volume of the loudspeaker is reduced, and the force factor of the loudspeaker is improved, so that the performance of the loudspeaker is improved, and the utility model is described by the specific embodiment below:
referring to fig. 1 to 3, a first embodiment of the present utility model is as follows:
a magnetic boost circuit system comprising: a magnetic circuit assembly 1, wherein the magnetic circuit assembly 1 comprises a yoke 11 and magnetic steel 12 arranged on a first side of the yoke; a magnetic boosting assembly 2, wherein the magnetic boosting assembly 2 is arranged on the second side of the yoke 11; the magnetic boosting assembly 2 comprises a central magnetic steel 21 and side magnetic steels 22 arranged around the central magnetic steel; the magnetic pole direction of the magnetic steel 12 is the same as the magnetic pole direction of the central magnetic steel 21, and the magnetic pole direction of the side magnetic steel 22 changes along with the magnetic pole direction of the magnetic steel 12.
It should be noted that the magnetic pole direction of the side magnetic steel 22 changes with the magnetic pole direction of the magnetic steel 12, that is, the magnetic line direction of the side magnetic steel 22 is the same as the magnetic line direction of the magnetic steel 12.
In an alternative embodiment, the magnetic steel 12 includes an inner magnetic steel 121 and an outer magnetic steel 122 disposed around the inner magnetic steel, and a magnetic pole direction of the outer magnetic steel 122 is opposite to a magnetic pole direction of the inner magnetic steel 121; the magnetic pole direction of the inner magnetic steel 121 is the same as the magnetic pole direction of the central magnetic steel 21.
In this embodiment, the magnetic circuit system further includes inner washer 31 and Bian Huasi, the inner washer 31 is disposed on a side of the inner magnet steel 121 away from the yoke 11, and the Bian Huasi is disposed on a side of the outer magnet steel 122 away from the yoke 11.
In an alternative embodiment, the center magnetic steel 21 and the side magnetic steel 22 are arranged in a halbach array.
Specifically, the edge magnetic steel 22 includes a first edge magnetic steel 221, a second edge magnetic steel 222, a third edge magnetic steel 223, and a fourth edge magnetic steel 224; the first side magnetic steel 221, the second side magnetic steel 222, the third side magnetic steel 223 and the fourth side magnetic steel 224 are respectively disposed around the central magnetic steel 21.
Specifically, the center points of the magnetic steel 12 and the center magnetic steel 21 are positioned on the same straight line.
Specifically, the edge magnetic steel 22 is attached to the center magnetic steel 21.
In this embodiment, referring to fig. 2 and 3, the magnetic pole direction of the inner magnetic steel 121 is positive z-axis, the magnetic pole direction of the outer magnetic steel 122 is negative z-axis, a rectangular space coordinate system of the magnetic circuit system is established, the first side magnetic steel 221 and the third side magnetic steel 223 are respectively located on positive y-axis and negative y-axis, and the second side magnetic steel 222 and the fourth side magnetic steel 224 are respectively located on positive x-axis and negative x-axis. The magnetic pole direction distribution of the side magnetic steel 22 is as follows: the magnetic boosting component is placed in the negative direction of the z axis of the magnetic circuit system, the magnetic pole direction of the central magnetic steel 21 faces positive direction of the z axis, the magnetic pole direction of the first side magnetic steel 221 located in the positive direction of the y axis faces negative direction of the y axis, the magnetic pole direction of the third side magnetic steel 223 located in the negative direction of the y axis faces positive direction of the y axis, the magnetic pole direction of the second side magnetic steel 222 located in the positive direction of the x axis faces negative direction of the x axis, and the magnetic pole direction of the fourth side magnetic steel 224 located in the positive direction of the x axis faces negative direction of the x axis. That is, the magnetic pole direction of the central magnetic steel 21 of the magnetic boosting assembly 2 is consistent with the magnetic pole direction of the inner magnetic steel 121, and the magnetic pole directions of the side magnetic steels 22 are all along the magnetic line direction of the inner washer 31 and the magnetic line direction of the Bian Huasi to face the center of the magnetic boosting assembly 2, so that the magnetic lines of the side magnetic steels 22 are converged towards the middle.
If the magnetic pole direction of the inner magnetic steel 121 is negative z-axis, the magnetic pole directions of the outer magnetic steel 122, the center magnetic steel 21, and the side magnetic steel 22 are opposite to the magnetic pole direction of the inner magnetic steel 121 when the magnetic pole direction is positive z-axis. The voice coil of the speaker is powered by alternating current, and the current direction is repeatedly changed, so that changing the magnetic pole direction of the magnetic steel does not change the relevant numerical value of the embodiment.
The inner magnetic steel 121 and the outer magnetic steel 122 have a gap therebetween, and projections of the outer magnetic steel 122 and the inner magnetic steel 121 are located on the side magnetic steel 22.
In an alternative embodiment, the magnetic circuit assembly 1 is attached to the magnetic boosting assembly 2. Here, the magnetic boosting unit 2 is not limited to be closely attached to the yoke 11, and the magnetic boosting unit 2 may be spaced apart from the yoke 11 by a predetermined distance, but the magnetic flux provided by the magnetic boosting unit 2 decreases as the distance increases.
It should be noted that, in the magnetic circuit system, the size range of the magnetic boosting assembly 2 is not limited, and for a specific product, the side magnetic steel 22 and the center magnetic steel 21 have a preferable size ratio, and need to be debugged according to an actual test result.
In an alternative embodiment, the center magnetic steel 21 and the side magnetic steel 22 have the same thickness.
In this embodiment, the inner magnetic steel 121, the outer magnetic steel 122 and the magnetic boosting component 2 are all N48H (neodymium iron boron magnetic steel).
In the embodiment, the magnetic flux in the magnetic circuit of the magnetic circuit system is provided by the inner magnetic steel and the outer magnetic steel, which is equivalent to the voltage provided by a power supply in the circuit; the air between the gaps between the inner magnetic steel and the outer magnetic steel forms a passage of a magnetic loop, which is equivalent to a wire in a circuit. If the wire is unchanged and the voltage increases, the current in the circuit increases. Therefore, the polarity of the central magnetic steel below the yoke is the same as that of the inner magnetic steel, so that the magnetic flux in the magnetic loop is increased, which is equivalent to adding a power supply in the circuit, so that the voltage of the whole circuit is increased, and the current is increased. Referring to fig. 2, the magnetic boosting assembly is composed of side magnetic steel and a central magnetic steel, the polarities of the side magnetic steel are gathered towards the z axis on the xy plane, so that the magnetic flux of the side magnetic steel is gathered towards the central magnetic steel, and then propagates forward towards the z axis and enters the magnetic loop of the loudspeaker. Thus, the magnetic boost assembly is effective to increase the magnetic flux and thus the force factor of the speaker.
Referring to fig. 4 to 8, a second embodiment of the present utility model is:
a magnetic boosting loudspeaker comprises the magnetic boosting magnetic circuit system in the first embodiment.
As can be seen from table 1 and fig. 4, compared with the conventional scheme, the single magnetic scheme and the speaker of the special-shaped single magnetic scheme in the prior art, the speaker comprising the halbach array magnetic boosting assembly can significantly improve the BL value of the voice coil, wherein the conventional scheme is a non-magnetic steel boosting structure; the single magnetic scheme is that only a central magnetic steel and an edge-free magnetic steel are arranged below an inner magnetic steel; the special-shaped single magnetic scheme comprises a central magnetic steel and side magnetic steels, wherein the magnetic pole directions of the central magnetic steel and the side magnetic steel are both one direction; based on the conventional data of the non-boosting magnetic steel, the single magnetic boosting can boost the amplitude of the BL curve by 4.09%, the abnormal single magnetic boosting can boost the amplitude of the BL curve by 6.54%, and the magnetic boosting component can boost the amplitude of the BL curve by 11.44%.
Table 1 values of the force factor BL curves of the speakers in different schemes
Referring to fig. 5 to 8, the single magnetic boost provides more magnetic flux density for the speaker magnetic circuit, and the abnormal single magnetic field is larger than the single magnetic field volume, so further provides more magnetic flux density for the speaker magnetic circuit, but because a part of the abnormal magnetic steel is positioned below the magnetic gap and the outer magnetic steel, the magnetic flux of the part of magnetic steel does not completely enter the voice coil magnetic circuit, and the effective utilization rate is lower. The four outer magnetic steel poles of the halbach array magnetic steel are converged in the middle along the direction of the magnetic force lines of the washer, and the central magnetic steel pole is forward towards the z-axis and is the same as the inner magnetic steel pole, so that the halbach array magnetic boosting component can remarkably improve the magnetic flux density of a magnetic loop, and the BL value of the voice coil is remarkably improved.
In summary, according to the magnetic boosting magnetic circuit system and the loudspeaker provided by the utility model, the magnetic flux of the magnetic circuit in the magnetic circuit system is provided by the inner magnetic steel and the outer magnetic steel, the gap between the inner magnetic steel and the outer magnetic steel forms the passage of the magnetic circuit through the air and the washer, the magnetic boosting assembly is arranged on one side of the yoke without changing the original structure of the loudspeaker, and the polarities of the magnetic steel in the center of the magnetic boosting assembly and the magnetic steel in the magnetic circuit assembly are the same, so that the magnetic flux generated by the magnetic circuit system is increased, and the magnetic flux in the passage of the magnetic circuit is increased. Meanwhile, the polarity of the side magnetic steel of the magnetic boosting assembly is matched with the magnetic pole direction of the magnetic steel, namely, along the direction of magnetic force lines of the magnetic circuit assembly, magnetic fluxes provided by the side magnetic steel enter a magnetic loop, so that the magnetic fluxes can be increased by the center magnetic steel and the side magnetic steel, the force factor BL of the loudspeaker is improved, and compared with other boosting magnetic steel structures, the halbach array magnetic boosting assembly has more remarkable effect of improving the magnetic flux density.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.
Claims (10)
1. A magnetic boosting magnetic circuit system, comprising:
the magnetic circuit assembly comprises a yoke and magnetic steel arranged on the first side of the yoke;
a magnetic boost assembly disposed on the second side of the yoke;
the magnetic boosting assembly comprises a central magnetic steel and side magnetic steels arranged around the central magnetic steel;
the magnetic pole direction of the magnetic steel is the same as that of the central magnetic steel, and the magnetic pole direction of the side magnetic steel changes along with the magnetic pole direction of the magnetic steel.
2. The magnetic boosting magnetic circuit system according to claim 1, wherein the center magnetic steel and the side magnetic steel are arranged in a halbach array.
3. The magnetic boosting magnetic circuit system according to claim 2, wherein said side magnetic steels include a first side magnetic steel, a second side magnetic steel, a third side magnetic steel and a fourth side magnetic steel; the first side magnetic steel, the second side magnetic steel, the third side magnetic steel and the fourth side magnetic steel are respectively arranged around the central magnetic steel.
4. A magnetic boosting magnetic circuit system according to claim 1 or 3, wherein the center points of said magnetic steel and said center magnetic steel are positioned on the same straight line.
5. A magnetic boosting magnetic circuit system according to claim 1 or 3, wherein said side magnetic steel is bonded to said center magnetic steel.
6. The magnetic boosting magnetic circuit system according to claim 1, wherein the magnetic steel comprises an inner magnetic steel and an outer magnetic steel arranged around the inner magnetic steel, and the magnetic pole direction of the outer magnetic steel is opposite to the magnetic pole direction of the inner magnetic steel; the magnetic pole direction of the inner magnetic steel is the same as the magnetic pole direction of the central magnetic steel.
7. The magnetic boosting magnetic circuit system according to claim 6, wherein a gap is formed between said inner magnetic steel and said outer magnetic steel, and projections of said outer magnetic steel and said inner magnetic steel are both located on said side magnetic steel.
8. The magnetic boosting magnetic circuit system according to claim 1, wherein said magnetic circuit assembly is attached to said magnetic boosting assembly.
9. The magnetic boosting magnetic circuit system according to claim 1, wherein said center magnetic steel and said side magnetic steel have the same thickness.
10. A magnetically assisted loudspeaker comprising a magnetically assisted magnetic circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222919919.3U CN219145590U (en) | 2022-11-02 | 2022-11-02 | Magnetic boosting magnetic circuit system and loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222919919.3U CN219145590U (en) | 2022-11-02 | 2022-11-02 | Magnetic boosting magnetic circuit system and loudspeaker |
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| Publication Number | Publication Date |
|---|---|
| CN219145590U true CN219145590U (en) | 2023-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222919919.3U Active CN219145590U (en) | 2022-11-02 | 2022-11-02 | Magnetic boosting magnetic circuit system and loudspeaker |
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| Country | Link |
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| CN (1) | CN219145590U (en) |
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- 2022-11-02 CN CN202222919919.3U patent/CN219145590U/en active Active
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