CN211128183U - Loudspeaker - Google Patents
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- CN211128183U CN211128183U CN202020132589.1U CN202020132589U CN211128183U CN 211128183 U CN211128183 U CN 211128183U CN 202020132589 U CN202020132589 U CN 202020132589U CN 211128183 U CN211128183 U CN 211128183U
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Abstract
The utility model provides a loudspeaker, which comprises a magnetic circuit component, a vibrating diaphragm component, a vibration monitoring and correcting component and a plurality of auxiliary voice coils; the plurality of auxiliary voice coils are arranged on the diaphragm assembly at intervals; the metal winding on the auxiliary voice coil can cut the magnetic induction line generated by the magnetic circuit component along with the vibration of the vibrating diaphragm component to generate electromotive force; the vibration monitoring and correcting component is respectively electrically connected with the auxiliary voice coils to detect electromotive force generated by the auxiliary voice coils, and applies corresponding current to each auxiliary voice coil according to a detection result to ensure the consistency of vibration of the vibrating diaphragm component at different positions. Add vice voice coil loudspeaker voice coil on the basis of original speaker, correct the subassembly through vibration control and carry out the adjustment of signal of telecommunication amplitude to a plurality of vice voice coil loudspeaker voice coils, make the vice voice coil loudspeaker voice coil of this end pass through the electric current increase or diminish, the drive power that obtains in the magnetic field to play upwards or decurrent effort and compensate, improve vibration system and roll and shake or sway the demonstration.
Description
Technical Field
The utility model relates to a technical field is made to the speaker, especially relates to a speaker.
Background
Electrodynamic loudspeakers are also known as moving-coil loudspeakers; it is an electroacoustic transducer applying the electric principle; it is the most widely used speaker at present, and there are three main reasons for it: 1. the electrodynamic loudspeaker has simple structure, easy production, and no need of large space, resulting in low cost and wide application. 2. Such a speaker can be made excellent in performance and can obtain a uniform frequency response in the middle frequency band. 3. In the continuous improvement of the loudspeaker, the development history of the loudspeaker in decades is the history of continuous improvement of the design, the process and the material of the loudspeaker and the history of the performance of the loudspeaker with the time. According to Faraday's law, when a current-carrying conductor passes through a magnetic field, an ampere force is applied, the direction of the ampere force accords with the left-hand rule, the force is perpendicular to the direction of the current and the direction of the magnetic field, and the force is in direct proportion to the current, the length of a lead and the magnetic flux density. When the voice coil inputs alternating audio current, the voice coil is subjected to an alternating driving force to generate alternating motion, so that the voice diaphragm assembly is driven to vibrate, and air is repeatedly pushed to produce sound. The loudspeaker manufactured by the principle has the problem of noise of the whole loudspeaker; the main reason is distortion frequency components caused by vibration system swing when the loudspeaker or the loudspeaker module works, and even noise caused by collision of the vibration system with a magnetic circuit system.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the utility model provides a pair of loudspeaker improves the sound quality of loudspeaker.
In order to solve the technical problem, the utility model discloses a technical scheme be:
a loudspeaker comprises a magnetic circuit assembly, a diaphragm assembly, a vibration monitoring and correcting assembly and a plurality of auxiliary voice coils;
the plurality of auxiliary voice coils are arranged on the diaphragm assembly at intervals;
the metal winding on the auxiliary voice coil can cut the magnetic induction line generated by the magnetic circuit component along with the vibration of the vibrating diaphragm component to generate electromotive force;
the vibration monitoring and correcting component is respectively electrically connected with the auxiliary voice coils to detect electromotive force generated by the auxiliary voice coils, and applies corresponding current to each auxiliary voice coil according to a detection result to ensure the consistency of vibration of the vibrating diaphragm component at different positions.
Furthermore, a plurality of flanges are arranged on the magnetic circuit component;
the plurality of flanges are arranged corresponding to the plurality of auxiliary voice coils; and the auxiliary voice coil is sleeved on the turnup in a sliding manner.
Further, the iron core comprises a plurality of iron cores;
the magnetic circuit assembly is provided with a plurality of mounting holes for mounting the iron core;
the mounting holes are arranged corresponding to the auxiliary voice coils; and the auxiliary voice coil is slidably sleeved on the iron core.
Further, the vibration monitoring and correcting component comprises a processor and an external power amplifier circuit;
one end of the external power amplifier circuit is electrically connected with the auxiliary voice coils respectively, and the other end of the external power amplifier circuit is electrically connected with the processor.
Further, the plurality of sub voice coils are arranged on the diaphragm assembly at equal intervals.
Further, the plurality of sub voice coils are symmetrically arranged about a center point of the diaphragm assembly.
Further, the distances from the plurality of sub voice coils to the magnetic circuit assembly are equal.
Further, four sub voice coils are included;
the four auxiliary voice coils are symmetrically arranged at the corners, close to the vibrating diaphragm component, of the vibrating diaphragm component.
The voice coil is fixedly arranged at the center of the vibrating diaphragm component;
the auxiliary voice coil is wound outside the main voice coil.
Further, the device also comprises a supporting component;
the support component is fixedly connected below the main voice coil and used for supporting the main voice coil.
The beneficial effects of the utility model reside in that: the utility model provides a loudspeaker, which comprises a magnetic circuit component, a vibrating diaphragm component, a vibration monitoring and correcting component and a plurality of auxiliary voice coils; the plurality of auxiliary voice coils are arranged on the diaphragm assembly at intervals; the metal winding on the auxiliary voice coil can cut the magnetic induction line generated by the magnetic circuit component along with the vibration of the vibrating diaphragm component so as to generate electromotive force; the vibration monitoring and correcting component is respectively electrically connected with the auxiliary voice coils to detect electromotive force generated by the auxiliary voice coils, and applies corresponding current to each auxiliary voice coil according to a detection result to ensure the consistency of vibration of the vibrating diaphragm component at different positions. This design adds vice voice coil loudspeaker voice coil on the basis of original speaker, when vibration diaphragm subassembly amplitude asymmetry from top to bottom, correct the subassembly through vibration control and carry out the adjustment of signal of telecommunication amplitude to a plurality of vice voice coil loudspeaker voice coils, make the vice voice coil loudspeaker voice coil of this end pass through the current increase or diminish, the drive power that obtains in magnetic field, thereby play upwards or decurrent effort and compensate, make vibration diaphragm subassembly amplitude symmetry from top to bottom, improve vibration system and roll and shake or sway the demonstration, reach the purpose that improves speaker acoustic performance.
Drawings
Fig. 1 is a front view of a speaker according to an embodiment of the present invention;
fig. 2 is a top view of a speaker according to an embodiment of the present invention;
fig. 3 is a left side view of a speaker according to an embodiment of the present invention;
fig. 4 is a bottom view of a speaker according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating an internal structure of a speaker according to an embodiment of the present invention;
fig. 6 is a top view of an internal structure of a speaker according to an embodiment of the present invention;
fig. 7 is a cross-sectional view of a speaker according to an embodiment of the present invention;
fig. 8 is an exploded view of the components of a loudspeaker according to an embodiment of the present invention;
description of reference numerals:
1. a magnetic circuit assembly; 2. a diaphragm assembly; 3. a sub voice coil; 4. flanging; 5. a main voice coil; 6. a support member; 7. a basin stand; 8. washer.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 8, a speaker includes a magnetic circuit assembly, a diaphragm assembly, a vibration monitoring and correcting assembly, and a plurality of sub-voice coils;
the plurality of auxiliary voice coils are arranged on the diaphragm assembly at intervals;
the metal winding on the auxiliary voice coil can cut the magnetic induction line generated by the magnetic circuit component along with the vibration of the vibrating diaphragm component to generate electromotive force;
the vibration monitoring and correcting component is respectively electrically connected with the auxiliary voice coils to detect electromotive force generated by the auxiliary voice coils, and applies corresponding current to each auxiliary voice coil according to a detection result to ensure the consistency of vibration of the vibrating diaphragm component at different positions.
The utility model discloses a theory of operation when the signal of telecommunication of main voice coil loudspeaker voice coil switch-on certain amplitude, main voice coil loudspeaker voice coil can drive the vibrating diaphragm subassembly and vibrate from top to bottom, because vice voice coil loudspeaker voice coil sets up on the vibrating diaphragm subassembly, vice voice coil loudspeaker voice coil can be along with the together vibration of vibrating diaphragm subassembly, the metal wire winding on the vice voice coil loudspeaker voice coil, its magnetism that can be along with the vibration cutting magnetic circuit subassembly of vibrating diaphragm subassembly produced is felt the line in order to produce electromotive force E ═ B L V.
When the heights of the auxiliary voice coils from the magnetic circuit component are consistent, the magnetic induction line cutting state of the magnetic circuit component is the same, so that the generated real-time dynamic electromotive force is also the same; when rolling vibration/swing exists in an actual vibration system, the vibration heights of four ends of the vibrating diaphragm assembly are inconsistent, so that the cutting magnetic induction lines of different auxiliary voice coils are inconsistent, the generated dynamic electromotive forces are unequal, and the rolling vibration/swing state of the micro loudspeaker is obtained by monitoring the data difference through the vibration monitoring correction assembly.
When the subassembly is corrected in vibration control monitors to the last different vice voice coil loudspeaker voice coil of vibrating diaphragm subassembly, certain end or some end height are lower or when higher, carry out the amplitude adjustment of the signal of telecommunication through vice voice coil loudspeaker voice coil to on this end vibrating diaphragm subassembly, make the vice voice coil loudspeaker voice coil of this end pass through the current increase or diminish, the ampere force F that obtains is BI L and increases or diminish than other ends, thereby play upwards or decurrent effort and compensate, thereby make four end height of vibrating diaphragm subassembly keep unanimous, solve and roll vibration/sway, accomplish real-time correction, reach balanced state, thereby promote tone quality effect and reliability allowance.
From the above description, the beneficial effects of the present invention are: the utility model provides a loudspeaker, which comprises a magnetic circuit component, a vibrating diaphragm component, a vibration monitoring and correcting component and a plurality of auxiliary voice coils; the plurality of auxiliary voice coils are arranged on the diaphragm assembly at intervals; the metal winding on the auxiliary voice coil can cut the magnetic induction line generated by the magnetic circuit component along with the vibration of the vibrating diaphragm component so as to generate electromotive force; the vibration monitoring and correcting component is respectively electrically connected with the auxiliary voice coils to detect electromotive force generated by the auxiliary voice coils, and applies corresponding current to each auxiliary voice coil according to a detection result to ensure the consistency of vibration of the vibrating diaphragm component at different positions. This design adds vice voice coil loudspeaker voice coil on the basis of original speaker, when vibration diaphragm subassembly amplitude asymmetry from top to bottom, correct the subassembly through vibration control and carry out the adjustment of signal of telecommunication amplitude to a plurality of vice voice coil loudspeaker voice coils, make the vice voice coil loudspeaker voice coil of this end pass through the current increase or diminish, the drive power that obtains in magnetic field, thereby play upwards or decurrent effort and compensate, make vibration diaphragm subassembly amplitude symmetry from top to bottom, improve vibration system and roll and shake or sway the demonstration, reach the purpose that improves speaker acoustic performance.
Furthermore, a plurality of flanges are arranged on the magnetic circuit component;
the plurality of flanges are arranged corresponding to the plurality of auxiliary voice coils; and the auxiliary voice coil is sleeved on the turnup in a sliding manner.
As can be seen from the above description, the flanged edge is provided to provide the magnetic field required for the operation of the sub voice coil in addition to the guiding function of the sub voice coil.
Further, the iron core comprises a plurality of iron cores;
the magnetic circuit assembly is provided with a plurality of mounting holes for mounting the iron core;
the mounting holes are arranged corresponding to the auxiliary voice coils; and the auxiliary voice coil is slidably sleeved on the iron core.
According to the above description, the arrangement of the iron core can enhance the magnetic induction intensity of the magnetic field where the auxiliary voice coil is located, so that the monitoring resolution is improved, and the correction driving force is larger.
Further, the vibration monitoring and correcting component comprises a processor and an external power amplifier circuit;
one end of the external power amplifier circuit is electrically connected with the auxiliary voice coils respectively, and the other end of the external power amplifier circuit is electrically connected with the processor.
According to the above description, the external power amplifier circuit is used for amplifying the amplitude of the detected electromotive force, then transmitting the signal to the processor for electric signal analysis and comparison, and sending corresponding adjusting current to different auxiliary voice coils to realize the self-balancing process after comparison. The connection between the external power amplifier circuit and the specific internal element and element of the processor belongs to the prior art, and therefore, it is not described herein in detail.
Further, the plurality of sub voice coils are arranged on the diaphragm assembly at equal intervals.
As can be seen from the above description, the purpose of arranging the sub voice coils at equal intervals is to better balance the rolling or swaying state of the diaphragm assembly; meanwhile, the phenomenon of rolling vibration or swinging of the vibrating diaphragm component caused by the uneven distribution of the auxiliary voice coil on the vibrating diaphragm component is also avoided.
Further, the plurality of sub voice coils are symmetrically arranged about a center point of the diaphragm assembly.
As can be seen from the above description, the sub voice coils are arranged symmetrically with respect to the center point of the diaphragm assembly to better balance the rolling or swaying state of the diaphragm assembly; meanwhile, the phenomenon of rolling vibration or swinging of the vibrating diaphragm component caused by the uneven distribution of the auxiliary voice coil on the vibrating diaphragm component is also avoided.
Further, the distances from the plurality of sub voice coils to the magnetic circuit assembly are equal.
It can be known from the above description that when the diaphragm assembly is not in operation, or when the diaphragm vibrates normally, the distances between the metal wires on the secondary voice coils and the magnetic circuit assembly are equal, so as to ensure that the electromotive forces generated by different secondary voice coils are equal during operation, thereby achieving the purpose of simplifying the calibration operation, and realizing the state of comparative vibration as long as corresponding difference calculation is performed.
Further, four sub voice coils are included;
the four auxiliary voice coils are symmetrically arranged at the corners, close to the vibrating diaphragm component, of the vibrating diaphragm component.
As can be seen from the above description, the purpose of symmetrically disposing the secondary voice coils near the corners of the diaphragm assembly is to better balance the rolling or swaying state of the diaphragm assembly; meanwhile, the phenomenon of rolling vibration or swinging of the vibrating diaphragm component caused by the uneven distribution of the auxiliary voice coil on the vibrating diaphragm component is also avoided.
The voice coil is fixedly arranged at the center of the vibrating diaphragm component;
the auxiliary voice coil is wound outside the main voice coil.
It can be known from the above description that the auxiliary voice coil is arranged outside the main voice coil, the volume of the internal magnetic steel can not be influenced, and the influence on the magnetic induction intensity of the working magnetic field of the main voice coil is small.
Further, the device also comprises a supporting component;
the support component is fixedly connected below the main voice coil and used for supporting the main voice coil.
As can be seen from the above description, the support member can effectively support the sub-voice coil and the main voice coil.
Referring to fig. 1 to 8, a first embodiment of the present invention is: a loudspeaker comprises a magnetic circuit component 1, a vibrating diaphragm component 2, a vibration monitoring and correcting component and a plurality of auxiliary voice coils 3;
the plurality of secondary voice coils 3 are arranged on the diaphragm assembly 2 at intervals;
a metal winding on the sub-voice coil 3 capable of cutting a magnetic induction line generated by the magnetic circuit assembly 1 with the vibration of the diaphragm assembly 2 to generate an electromotive force;
the vibration monitoring and correcting component is respectively electrically connected with the auxiliary voice coils 3 to detect electromotive forces generated by the auxiliary voice coils 3, and applies corresponding current to each auxiliary voice coil 3 according to a detection result to ensure the consistency of vibration of the vibrating diaphragm component 2 at different positions.
Referring to fig. 6 to 8, specifically, a plurality of flanges 4 are disposed on the magnetic circuit assembly 1;
the plurality of flanges 4 are arranged corresponding to the plurality of sub voice coils 3; and the auxiliary voice coil 3 is sleeved on the flange 4 in a sliding manner.
Specifically, the vibration monitoring and correcting component comprises a processor and an external power amplifier circuit; wherein the processor can be a CPU or a DSP;
one end of the external power amplifier circuit is respectively electrically connected with the plurality of auxiliary voice coils 3, and the other end of the external power amplifier circuit is electrically connected with the processor.
Referring to fig. 5 to 7, specifically, the plurality of sub voice coils 3 are disposed on the diaphragm assembly 2 at equal intervals.
Referring to fig. 5 to 7, in particular, the plurality of sub voice coils 3 are symmetrically disposed about a center point of the diaphragm assembly 2.
Referring to fig. 8, specifically, the flowerpot further comprises a flowerpot frame 7, wherein the flowerpot frame 7 and the washer 8 are integrally formed by injection molding; the magnetic circuit component 1 is arranged below the basin stand 7; the support member 6 is disposed below the main voice coil 5 and the sub voice coil 3; the diaphragm assembly 2 is disposed above the main voice coil 5 and the sub voice coil 3.
The magnetic induction line emitted by the magnetic circuit component 1 is vertical to the vibration direction of the auxiliary voice coil 3 and is also vertical to the routing direction of the metal winding of the auxiliary voice coil 3; the magnetic induction in the vibration direction of the sub voice coil 3 is different. And the metal winding wires on the auxiliary voice coil 3 are respectively provided with an inlet wire and an outlet wire which are conducted with external signals.
Referring to fig. 7, a second embodiment of the present invention is: in this embodiment, the distances from the sub voice coils 3 to the magnetic circuit assembly 1 are equal to each other in the first embodiment.
Referring to fig. 5 and 6, specifically, the voice coil assembly includes four sub voice coils 3;
the four auxiliary voice coils 3 are symmetrically arranged at the corners, close to the diaphragm component 2, of the diaphragm component 2.
The third embodiment of the present invention is: in this embodiment, on the basis of the first or second embodiment, the voice coil assembly further includes a main voice coil 5, and the main voice coil 5 is fixedly disposed at the center of the diaphragm assembly 2;
the auxiliary voice coil 3 is wound outside the main voice coil.
Specifically, the device further comprises a supporting component 6;
the support member 6 is fixedly connected to a lower portion of the main voice coil 5 to support the main voice coil 5.
Specifically, the support part 6 is fixedly connected with the frame 7, and the support part 6 is fixed with the main voice coil 5 in a gluing mode.
The embodiment of the utility model provides a fourth is: the present embodiment is different from the first embodiment in the way of generating the operating magnetic field of the sub voice coil 3. Specifically, the iron core comprises a plurality of iron cores;
a plurality of mounting holes for mounting the iron core are formed in the magnetic circuit component 1;
the plurality of mounting holes are arranged corresponding to the plurality of sub voice coils 3; and the auxiliary voice coil 3 is slidably sleeved on the iron core.
To sum up, the utility model provides a loudspeaker, which comprises a magnetic circuit component, a vibrating diaphragm component, a vibration monitoring and correcting component and a plurality of auxiliary voice coils; the plurality of auxiliary voice coils are arranged on the diaphragm assembly at intervals; the metal winding on the auxiliary voice coil can cut the magnetic induction line generated by the magnetic circuit component along with the vibration of the vibrating diaphragm component so as to generate electromotive force; the vibration monitoring and correcting component is respectively electrically connected with the auxiliary voice coils to detect electromotive force generated by the auxiliary voice coils, and applies corresponding current to each auxiliary voice coil according to a detection result to ensure the consistency of vibration of the vibrating diaphragm component at different positions. This design adds vice voice coil loudspeaker voice coil on the basis of original speaker, when vibration diaphragm subassembly amplitude asymmetry from top to bottom, correct the subassembly through vibration control and carry out the adjustment of signal of telecommunication amplitude to a plurality of vice voice coil loudspeaker voice coils, make the vice voice coil loudspeaker voice coil of this end pass through the current increase or diminish, the drive power that obtains in magnetic field, thereby play upwards or decurrent effort and compensate, make vibration diaphragm subassembly amplitude symmetry from top to bottom, improve vibration system and roll and shake or sway the demonstration, reach the purpose that improves speaker acoustic performance. Furthermore, the flanging arranged on the magnetic circuit component has a guiding effect on the auxiliary voice coil and also provides a magnetic field required by the work for the auxiliary voice coil; or, set up the iron core on magnetic circuit assembly, it can strengthen the magnetic induction intensity of the magnetic field that vice voice coil loudspeaker voice coil was located, reaches the resolution ratio that improves the control, makes and corrects drive power bigger. Moreover, the auxiliary voice coil is arranged outside the main voice coil, the volume of the internal magnetic steel can not be influenced, and the influence on the magnetic induction intensity of the working magnetic field of the main voice coil is small.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (10)
1. A loudspeaker is characterized by comprising a magnetic circuit component, a diaphragm component, a vibration monitoring and correcting component and a plurality of auxiliary voice coils;
the plurality of auxiliary voice coils are arranged on the diaphragm assembly at intervals;
the metal winding on the auxiliary voice coil can cut the magnetic induction line generated by the magnetic circuit component along with the vibration of the vibrating diaphragm component to generate electromotive force;
the vibration monitoring and correcting component is respectively electrically connected with the auxiliary voice coils to detect electromotive force generated by the auxiliary voice coils, and applies corresponding current to each auxiliary voice coil according to a detection result to ensure the consistency of vibration of the vibrating diaphragm component at different positions.
2. The loudspeaker of claim 1, wherein the magnetic circuit assembly is provided with a plurality of flanges;
the plurality of flanges are arranged corresponding to the plurality of auxiliary voice coils; and the auxiliary voice coil is sleeved on the turnup in a sliding manner.
3. A loudspeaker according to claim 1, further comprising a plurality of cores;
the magnetic circuit assembly is provided with a plurality of mounting holes for mounting the iron core;
the mounting holes are arranged corresponding to the auxiliary voice coils; and the auxiliary voice coil is slidably sleeved on the iron core.
4. The loudspeaker of claim 1, wherein the vibration monitoring and correction component comprises a processor and an external power amplifier circuit;
one end of the external power amplifier circuit is electrically connected with the auxiliary voice coils respectively, and the other end of the external power amplifier circuit is electrically connected with the processor.
5. A loudspeaker according to claim 1, wherein the plurality of sub-voice coils are equally spaced on the diaphragm assembly.
6. A loudspeaker according to claim 1, wherein the plurality of sub-coils are arranged symmetrically about a center point of the diaphragm assembly.
7. A loudspeaker according to claim 1, 5 or 6, wherein a plurality of said sub-coils are equidistant from said magnetic circuit assembly.
8. A loudspeaker according to claim 7, comprising four sub-coils;
the four auxiliary voice coils are symmetrically arranged at the corners, close to the vibrating diaphragm component, of the vibrating diaphragm component.
9. The loudspeaker of claim 1, further comprising a main voice coil fixedly disposed at a central position of the diaphragm assembly;
the auxiliary voice coil is wound outside the main voice coil.
10. A loudspeaker according to claim 9, further comprising a support member;
the support component is fixedly connected below the main voice coil and used for supporting the main voice coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020132589.1U CN211128183U (en) | 2020-01-20 | 2020-01-20 | Loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020132589.1U CN211128183U (en) | 2020-01-20 | 2020-01-20 | Loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211128183U true CN211128183U (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020132589.1U Active CN211128183U (en) | 2020-01-20 | 2020-01-20 | Loudspeaker |
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| Country | Link |
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| CN (1) | CN211128183U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116709142A (en) * | 2023-07-31 | 2023-09-05 | 江苏裕成电子有限公司 | Multi-voice coil loudspeaker module |
-
2020
- 2020-01-20 CN CN202020132589.1U patent/CN211128183U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116709142A (en) * | 2023-07-31 | 2023-09-05 | 江苏裕成电子有限公司 | Multi-voice coil loudspeaker module |
| CN116709142B (en) * | 2023-07-31 | 2023-10-27 | 江苏裕成电子有限公司 | Multi-voice coil loudspeaker module |
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