CN208445745U - A kind of loudspeaker - Google Patents
A kind of loudspeaker Download PDFInfo
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- CN208445745U CN208445745U CN201820891642.9U CN201820891642U CN208445745U CN 208445745 U CN208445745 U CN 208445745U CN 201820891642 U CN201820891642 U CN 201820891642U CN 208445745 U CN208445745 U CN 208445745U
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Abstract
A kind of loudspeaker, has vibrational system and magnetic circuit system, and vibrational system includes upper diaphragm component and the voice coil for driving the upper diaphragm component vibration；Magnetic circuit system includes intermediate magnet steel and the intermediate magnetic conductive board for being attached at the intermediate magnet steel surface, outer steel is additionally provided with around intermediate magnet steel, the top of outer steel is equipped with upper conduction magnetic board, and the lower section of outer steel is equipped with lower magnetic conductive board, is equipped with the gap passed through for voice coil between upper conduction magnetic board and intermediate magnetic conductive board；The voice coil is at least partly suspended between intermediate magnet steel and outer steel；It further include lower diaphragm unit, the lower diaphragm unit includes gasket and lower ring, and the gasket is attached at the lower surface of voice coil, and one end of lower ring is attached at the lower surface of gasket, and the other end of lower ring is attached at the lower surface of outer steel.Not only it can guarantee lesser magnetic gap, but also can effectively inhibit polarization phenomena, and manufacturing process is easy.
Description
Technical field
The utility model relates to a kind of loudspeakers, and in particular to one kind is in the intelligent movables equipment such as mobile phone, tablet computer
The Microspeaker used.
Background technique
In the intelligent movables equipment such as mobile phone, plate, loudspeaker is widely used, with intelligent movable equipment
Development, to loudspeaker voice and musical qualities, reliability, weight, in terms of have more next higher requirement.
The existing Microspeaker used in the intelligent movables equipment such as mobile phone mainly includes vibrational system, magnetic circuit system
System and the frame and front cover for accommodating and supporting vibrational system and magnetic circuit system.Vibrational system includes vibrating diaphragm and the driving vibrating diaphragm
The voice coil of vibration, voice coil are attached thereto in the side of vibrating diaphragm, and top dome is equipped with above vibrating diaphragm.Magnetic circuit system mainly includes magnet steel and patch
Invest the magnetic conductive board etc. on magnet steel surface.Class is disclosed in patent CN201520257565.8 and patent CN201310659401.3
As loudspeaker, wherein patent CN201520257565.8 more clearly discloses existing single body construction for loudspeaker, patent
CN201310659401.3 then discloses loudspeaker monomer in more detail and is installed to formation loudspeaker mould group in shell and raises
The technical solution that sound device mould group and terminal electronic product are used cooperatively.
Since intelligent movable apparatus field is higher and higher to the reliability of speaker product and the requirement of micromation, internal magnetic
The requirement of gap and outer magnetic gap is also just higher and higher, and the magnetic gap increasingly reduced also can be more and more sensitive to the polarization of vibrating diaphragm.
The root that polarization generates is the intrinsic diaphagras of vibrating object.Especially high power driving under, be easier by
Excitation, leads to diaphragm rocking vibration, and voice coil can follow diaphragm to do rocking vibration, generates collision abnormal sound with magnetic circuit component.
There are the means for solving polarization problem as additional support members using centring disk in the prior art, but it is existing
Technological means generally requires the components such as additional alternations frame and can occupy more space, and manufacture and assembly technology are more complicated,
Cost is also higher.
As another thinking, CN104768111B discloses a kind of speaker unit of inhibition polarization, a kind of adjustment is raised
The method of sound device vibrating diaphragm equilbrium position and a kind of method that the adjustment diaphragm of loudspeaker is pliable, comprising: vibrational system, magnetic circuit system
System, consistent first electret layer of shell and charge polarity for accommodating vibrational system and magnetic circuit system, the second electret layer and
Third electret layer；First electret layer depends on vibrational system, and the second electret layer depends on first on vibrational system
Fixation member and opposite with the first electret layer, third electret layer depends on the second fixation member under vibrational system simultaneously
And it is opposite with the first electret layer；And the first electret layer, the second electret layer and third electret layer are parallel to each other.This reality
Polarization of the vibrating diaphragm on direction of vibration is inhibited using applied force of electrostatic field with novel, electrostatic field force is provided by electret layer,
Do not need extrinsic motivated signal and it is simple for assembly process, inhibitory effect is good.However in the technological means each electret layer or
Electret film/electret pole plate coating process of person's bonding is relatively difficult, is difficult efficiently to ensure that its effect is realized；And
Need further to be adjusted in the fabrication process or after the completion of manufacture, for current, reliability and manufacture efficiency compared with
It is low.
Utility model content
In view of above situation, the utility model proposes one kind not only can guarantee lesser magnetic gap, but also can effectively inhibit to polarize
Phenomenon, and the loudspeaker of manufacturing process simplicity.
Loudspeaker according to the present utility model has vibrational system and magnetic circuit system, and vibrational system includes upper diaphragm component
With the voice coil for driving the upper diaphragm component vibration；Magnetic circuit system includes intermediate magnet steel and is attached at the intermediate magnet steel surface
Intermediate magnetic conductive board, outer steel is additionally provided with around intermediate magnet steel, the top of outer steel is equipped with upper conduction magnetic board, outer steel and intermediate magnetic
The lower section of steel is equipped with lower magnetic conductive board, is equipped with the gap passed through for voice coil between upper conduction magnetic board and intermediate magnetic conductive board；The voice coil is extremely
Small part is suspended between intermediate magnet steel and outer steel；It further include lower diaphragm unit, the lower diaphragm unit includes gasket under
Ring, the gasket are attached at the lower surface of voice coil, and one end of lower ring is attached at the lower surface of gasket, the other end of lower ring
It is attached at the lower surface of outer steel.
Further, the upper diaphragm component includes ring and the top dome that is attached on ring, voice coil be fixed on ring and/
Or below top dome.
Preferably, the lower ring has and the consistent arch segmental arc of ring bending direction.
Preferably, the outer steel is integral type ring structure.
Preferably, the edge of the lower magnetic conductive board is equipped with evacuation notch, and the evacuation notch is set to lower diaphragm unit
Lower section, and projection size of the lower diaphragm unit on lower magnetic conductive board is less than the size of the evacuation notch.
Preferably, the centre of the lower magnetic conductive board is equipped with lower concave part.
Preferably, the centre of the lower magnetic conductive board is equipped with lower concave part, and the concave part is in the lower section of voice coil；Lower concave part
Size is greater than projection size or the lower concave part of the voice coil on lower magnetic conductive board and extends upwardly in the side of setting evacuation notch
Intersect with the evacuation notch.
Preferably, the lower diaphragm unit is equipped with two groups altogether, and diaphragm unit is symmetricly set on the both ends of voice coil under two groups.
Further, the both ends of the lower magnetic conductive board are respectively equipped with an evacuation notch, and each evacuation notch respectively corresponds
The lower position of diaphragm unit under one group is set.
Further, the magnetic circuit system and vibrational system are fixed in frame, and weld tabs, weld tabs point are equipped in the frame
It is not connect with the connecting line of the coil lead of voice coil and external feed-in electric signal.
Take the utility model proposes technology after, technical solution according to the present utility model, have it is below beneficial
Effect:
1) improve polarization degree when voice coil movement；It is compared with the micro- electroacoustic trumpet of existing routine, the Small diaphragm-piece (lower film having more
Piece component) optimization polarization anomaly, reduces the exception for hitting magnetic circuit component in voice coil polarization process, promotes product service life.
2) outer steel combines the driving force for increasing product by interior external magnetic circuit space structure, than routine using integrated design
The external magnetic circuit fission deisgn product of more magnetic products has stronger anti-drop breakdown strength.On the other hand, outer steel can be using viscous
It connects technique to fix, on technique for sticking, integrated design outer steel can save bonding process, promote operating efficiency and reduce artificial
Cost.
3) lower ring is arranged in the lower surface of outer steel, the magnetic circuit of ring loudspeaker will not be broken in this way, does not need separately to set
Support member is set, the setting from frame or other components is not needed yet and protrudes into the structure of inside loudspeakers to provide and support fixed function
Energy.Polarization anomaly can not only be optimized, and ensure that minimum on magnetic circuit influence, it is often more important that ensure the minimum of volume,
Product manufacturing and assembly technology are easy.
4) it is bonded on voice coil by setting gasket and makes up drop, and the lower enough oscillation spaces of ring can be provided, and
The manufacture and assembling of gasket are very convenient.
5) voice coil driving sky is avoided by the lower concave part of the evacuation notch and sinking step design that are arranged on lower magnetic conductive board
Between, it can be ensured that the oscillation space of lower diaphragm unit；Meanwhile the sinking step design of lower magnetic conductive board, both ensured that intermediate magnetic circuit had
Biggish space utilization rate, the space for thering is certifiable voice coil to vibrate downwards.
6) it can be improved in existing Microspeaker structure basis, not only be able to achieve the target for improving polarization, but also can protect
Lesser structure size is demonstrate,proved, manufacture, assembly cost are reduced, guarantees reliability of structure.
Detailed description of the invention
Fig. 1 is the loadspeaker structure exploded view of the application；
Fig. 2 is the loudspeaker cross-sectional view of the application；
Fig. 3 is the portion the A enlarged view of Fig. 2；
Fig. 4 is the lower magnetic conductive board structure chart of the application.
Specific embodiment
The utility model is described in further detail below in conjunction with the embodiment that attached drawing provides.Described implementation
Example includes the various details for helping to understand, but they can only be counted as illustratively, be a part of the utility model
Embodiment, instead of all the embodiments.Meanwhile in order to keep specification more clear succinct, will omit pair it is well known that function
The detailed description that can and construct.
Unless otherwise defined, the technical term or scientific term used herein is should be in the utility model fields
The ordinary meaning that personage with general technical ability is understood."upper" described herein, "lower" or " top ", " lower section " are these
The upper and lower relation that application attached drawing is substantially shown.When placement status changes, such as when overturning, corresponding positional relationship
It should convert therewith to understand or implement the technical solution of the application.
A kind of loudspeaker has vibrational system and magnetic circuit system, vibrational system includes upper diaphragm group as depicted in figs. 1 and 2
Part 10 and the voice coil 20 for driving the upper diaphragm component 10 to vibrate；Magnetic circuit system includes intermediate magnet steel 30 and is attached in described
Between 30 surface of magnet steel intermediate magnetic conductive board 40, outer steel 31 is additionally provided with around intermediate magnet steel 30, the top of outer steel 31 is equipped with upper
The lower section of magnetic conductive board 42, outer steel 31 and intermediate magnet steel 30 is equipped with lower magnetic conductive board 41, upper conduction magnetic board 42 and intermediate magnetic conductive board 40 it
Between be equipped with the gap passed through for voice coil；The voice coil 20 is at least partly suspended between intermediate magnet steel 30 and outer steel 31；It is described
Magnetic circuit system and vibrational system are fixed in frame 60, in the frame 60 be equipped with weld tabs 61, weld tabs 61 respectively with voice coil 20
The connecting line connection of coil lead and external feed-in electric signal.
Further, incorporated by reference to shown in Fig. 1 to Fig. 3, the loudspeaker of the present embodiment further includes lower diaphragm unit 50, under described
Diaphragm unit 50 includes gasket 51 and lower ring 52, and the gasket 51 is attached at the lower surface of voice coil 20, one end of lower ring 52
It is attached at the lower surface of gasket 51, the other end of lower ring 52 is attached at the lower surface of outer steel 31.The lower diaphragm unit 50
It is equipped with the both ends that diaphragm unit 50 under two groups, two groups is symmetricly set on voice coil 20 altogether.
The upper diaphragm component 10 includes ring 11 and the top dome 12 being attached on ring 11, and voice coil 20 is fixed on ring 11
12 lower section of top dome and/or.The lower ring 52 has and the consistent arch segmental arc of 11 bending direction of ring.
Further, the outer steel 31 is integral type ring structure.
Further incorporated by reference to shown in Fig. 1, Fig. 2 and Fig. 4, the edge of the lower magnetic conductive board 41 is equipped with evacuation notch 410, described
Evacuation notch 410 is set to the lower section of lower diaphragm unit 50, and projection size of the lower diaphragm unit 50 on lower magnetic conductive board 41
Less than the size of the evacuation notch 410.The both ends of lower magnetic conductive board 41 are respectively equipped with an evacuation notch 410, and each evacuation lacks
Mouth 410 respectively corresponds the lower position that diaphragm unit 50 under one group is arranged in.
The centre of the lower magnetic conductive board 41 is equipped with lower concave part 411, and the lower concave part 411 is located at the lower section of voice coil 20；It is recessed
The size in portion 411 is greater than projection size or the lower concave part 411 of the voice coil 20 on lower magnetic conductive board 41 and avoids notch in setting
410 side is extended upwardly to intersects with the evacuation notch 410.
According to the loudspeaker of the application, the gasket 51 is attached at the lower surface of voice coil 20, and one end of lower ring 52 attaches
In the lower surface of gasket 51, the other end of lower ring 52 is attached at the lower surface of outer steel 31 and the top dome 12 is attached at
On ring 11, attaching can be realized using glue bonding or insert injection moulding mode or other feasible modes.Similar, upper magnetic conduction
The lower surface of plate 42 and the upper surface of outer steel 31 and outer steel 31 and lower magnetic conductive board 41, lower magnetic conductive board 41 and intermediate magnet steel
The corresponding surface contacted can also use glue bonding or other feasible between 30 and intermediate magnet steel 30 and intermediate magnetic conductive board 40
Mode realize attaching.Voice coil 20 can be fixed on top dome using glue bonding or insert injection moulding mode or other feasible modes
12 and/or ring 11 on.
Intermediate magnet steel 30 and 31 surrounding of outer steel form magnetic field, and by intermediate magnetic conductive board 40, upper conduction magnetic board 42 and under lead
Magnetic sheet 41 optimizes magnetic field, and the voice coil 20 is at least partly suspended between intermediate magnet steel 30 and outer steel 31, voice coil 20
It is passed into electric current when in use to the forced vibration in magnetic field, and drives 10 vibration sounding of upper diaphragm component.
Using voice coil driving, diaphragm design, 20 upper and lower ends of voice coil are connected to upper diaphragm group to the loudspeaker of the application respectively up and down
Part 10 and lower diaphragm unit 50, there are two lower diaphragm units 50, is symmetric, and is mainly made of lower ring 52 and gasket 51.
Totally three diaphragms, upper diaphragm component 10 mainly convert kinetic energy into sound energy, lower diaphragm unit to the driving of voice coil 20 up and down
50 mainly improve polarization degree when voice coil movement；It is compared with the micro- electroacoustic trumpet of existing routine, Small diaphragm-piece (the lower diaphragm having more
Component 50) optimization polarization anomaly, reduces the exception for hitting magnetic circuit component in 20 polarization process of voice coil, promotes product service life.
Lower diaphragm unit 50 is placed in 20 bottom of voice coil, and when polarization situation occurs for main vibrating diaphragm, that is, upper diaphragm component 10, auxiliary vibrating diaphragm is
Lower diaphragm unit 50 is played a supporting role in 20 bottom of voice coil, is maintained voice coil 20 normally to vibrate up and down state, is avoided and magnetic circuit
System collision generates abnormal sound.
The outer steel 31 of the application using integrated design, intermediate magnet steel 30, intermediate magnetic conductive board 40, lower magnetic conductive board 41, on lead
Magnetic sheet 42 and outer steel 31 constitute interior external magnetic circuit, and the driving force for increasing product is combined by interior external magnetic circuit space structure.External magnetic circuit
In magnet steel using integrated design, than the external magnetic circuit fission deisgn product of conventional more magnetic products have it is stronger it is anti-drop destroy it is strong
Degree.On the other hand, outer steel 31 can be fixed using technique for sticking, and on technique for sticking, integrated design outer steel can be saved
Bonding process promotes operating efficiency and reduces cost of labor.
The loudspeaker of the application is in order to realize compact layout, to reduce the thickness and length dimension of loudspeaker, obtain compared with
Lower ring 52 is arranged under outer steel 31 convenient for preferably applying in the electronic products such as mobile phone for small loudspeaker volume
Surface will not break the magnetic circuit of ring loudspeaker in this way, not need that support member is separately arranged, and also not need from frame 60 or other portions
The structure for protruding into inside loudspeakers is set on part to provide support fixed function, because latter two method not only can be because of increased portion
Part/structure and widen size to expanding overall volume, and will cause the complexity on product manufacturing and assembly technology, increase
Cost is added.Lower ring 52, which is arranged, in the application can not only optimize polarization anomaly, and ensure that on magnetic circuit influence minimum, more important
The minimum for being to ensure that volume, volume will not be increased because lower ring 52 is added, product manufacturing and dress will not be caused
With technologic complexity, the application only needs for lower ring 52 to be bonded on the component of magnetic circuit system.
The bottom of voice coil 20 is arranged in the lower diaphragm unit 50 of the application, on fabrication technology for it is convenient to carry out.
If the side wall of voice coil 20 is arranged in, not only need to occupy magnetic gap space, so that the increase of magnetic gap is caused, between smaller magnetic
The demand of gap is runed counter to；And manufacture assembly when implement it is relatively difficult, if in order to reduce technology difficulty increase magnetic gap, can have
Same drawback causes the increase of component and overall dimensions.
The lower diaphragm unit 50 of the application is equipped with diaphragm unit 50 under two groups, two groups altogether and is symmetricly set on the two of voice coil 20
End, ring setting are advisable in short side.The target of optimization polarization anomaly is realized by the limitation at both ends, and because is closely limited
Voice coil 20 only need to occupy lesser space, can increase magnetic circuit so not needing to can reach desired effects throughout voice coil periphery
The space of magnet steel in system, convenient for the optimization of properties of product.If being respectively provided with auxiliary diaphragm in the four direction of voice coil 20 to be limited
System, then can lose more magnet steel spatial volume.Importantly, the application is by being arranged annular outer steel 31 and by auxiliary film
Piece is set to the lower section of outer steel 31, can more increase the space for magnet steel use in magnetic circuit system/occupy, be conducive to performance boost
Optimization.
On the other hand, the lateral dimension of the lower diaphragm unit 50 of the application is not limited by gap between voice coil and shell,
Structure is more flexible, can be arbitrarily sized.For the maximization of magnet volume, the transverse direction of the lower diaphragm unit 50 of the application
Size can accomplish to minimize.Certainly, it according to the performance needs of loudspeaker, can also be adjusted round about, the two can
Design is adjusted to cooperate.
Voice coil 20 is bonded in by the way that gasket 51 is arranged between the lower ring 52 and voice coil 20 of the lower diaphragm unit 50 of the application
On make up drop.The other end of lower ring 52 connects, and needs to be bonded on voice coil 20, because lower ring 52 is arranged in outer steel 31
Lower surface, there are larger drops between lower ring 52 and voice coil 20.Voice coil 20 and lower ring 52 are accepted by using gasket 51,
Not only drop can be reduced, but also the lower enough oscillation spaces of ring 52 can be provided, and the manufacture and assembling of gasket 51 are very convenient.
The application is kept away by the lower concave part 411 of the evacuation notch 410 and sinking step design that are arranged on lower magnetic conductive board 41
Voice coil 20 is allowed to drive space.The region of the lower diaphragm unit 50 under correspondence of magnetic conductive board 41 carries out notch design, it can be ensured that lower film
The oscillation space of piece component 50, the sinking step design of lower magnetic conductive board 41 had both ensured that intermediate magnetic circuit had biggish space utilization rate,
Ensure that the space that voice coil 20 vibrates downwards.Be conducive under the product thickness of limitation to ring 52 under lower diaphragm unit 50/
More oscillation spaces are provided, in other words, in the case where equal performance requires, smaller integral thickness can be obtained.
Claims (10)
1. a kind of loudspeaker, has vibrational system and magnetic circuit system, vibrational system includes described in upper diaphragm component (10) and driving
The voice coil (20) of upper diaphragm component (10) vibration；Magnetic circuit system includes intermediate magnet steel (30) and is attached at the intermediate magnet steel
(30) the intermediate magnetic conductive board (40) on surface, intermediate magnet steel (30) surrounding are additionally provided with outer steel (31), and outer steel is set above (31)
Have upper conduction magnetic board (42), the lower section of outer steel (31) and intermediate magnet steel (30) is equipped with lower magnetic conductive board (41), upper conduction magnetic board (42) and
The gap passed through for voice coil is equipped between intermediate magnetic conductive board (40)；The voice coil (20) is at least partly suspended in intermediate magnet steel (30)
Between outer steel (31)；It is characterized in that, further including lower diaphragm unit (50), the lower diaphragm unit (50) includes gasket
(51) and lower ring (52), the gasket (51) are attached at the lower surface of voice coil (20), and one end of lower ring (52) is attached at pad
The other end of the lower surface of piece (51), lower ring (52) is attached at the lower surface of outer steel (31).
2. a kind of loudspeaker according to claim 1, which is characterized in that the upper diaphragm component (10) includes ring (11)
With the top dome (12) being attached on ring (11), voice coil (20) is fixed below ring (11) and/or top dome (12).
3. a kind of loudspeaker according to claim 2, which is characterized in that the lower ring (52) has curved with ring (11)
The consistent arch segmental arc of Qu Fangxiang.
4. a kind of loudspeaker according to claim 1, which is characterized in that the outer steel (31) is integral type ring junction
Structure.
5. a kind of loudspeaker according to claim 1, which is characterized in that the edge of the lower magnetic conductive board (41) is equipped with evacuation
Notch (410), evacuation notch (410) is set to the lower section of lower diaphragm unit (50), and lower diaphragm unit (50) is under
Projection size on magnetic conductive board (41) is less than the size of evacuation notch (410).
6. a kind of loudspeaker according to claim 1 or 5, which is characterized in that the centre of the lower magnetic conductive board (41) is equipped with
Lower concave part (411).
7. a kind of loudspeaker according to claim 5, which is characterized in that the centre of the lower magnetic conductive board (41) is equipped with recessed
Portion (411), the lower concave part (411) are located at the lower section of voice coil (20)；The size of lower concave part (411) is greater than voice coil (20) and leads under
Projection size or the lower concave part (411) on magnetic sheet (41) extend upwardly to and institute in the side of setting evacuation notch (410)
State evacuation notch (410) intersection.
8. a kind of according to claim 1, loudspeaker described in any one of 2,3,4,5 or 7, which is characterized in that the lower film
Piece component (50) is equipped with the both ends that diaphragm unit (50) under two groups, two groups is symmetricly set on voice coil (20) altogether.
9. a kind of loudspeaker according to claim 8, which is characterized in that the both ends of the lower magnetic conductive board (41) are respectively equipped with
One evacuation notch (410), each evacuation notch (410) respectively correspond the lower orientation that diaphragm unit (50) is arranged under one group
It sets.
10. a kind of loudspeaker according to claim 1, which is characterized in that the magnetic circuit system and vibrational system are fixed on
In frame (60), in the frame (60) be equipped with weld tabs (61), weld tabs (61) respectively with the coil lead of voice coil (20) and outside
The connecting line of feed-in electric signal connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820891642.9U CN208445745U (en) | 2018-06-11 | 2018-06-11 | A kind of loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820891642.9U CN208445745U (en) | 2018-06-11 | 2018-06-11 | A kind of loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208445745U true CN208445745U (en) | 2019-01-29 |
Family
ID=65089386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820891642.9U Active CN208445745U (en) | 2018-06-11 | 2018-06-11 | A kind of loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208445745U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712707A (en) * | 2018-06-11 | 2018-10-26 | 常州市润蒙声学科技有限公司 | Loud speaker |
| WO2020237575A1 (en) * | 2019-05-30 | 2020-12-03 | Harman International Industries, Incorporated | A micro speaker with symmetrical voice coil and magnetic circuit |
| US12010499B2 (en) | 2019-05-30 | 2024-06-11 | Harman International Industries, Incorporated | Micro speaker with symmetrical voice coil and magnetic circuit |
-
2018
- 2018-06-11 CN CN201820891642.9U patent/CN208445745U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712707A (en) * | 2018-06-11 | 2018-10-26 | 常州市润蒙声学科技有限公司 | Loud speaker |
| WO2020237575A1 (en) * | 2019-05-30 | 2020-12-03 | Harman International Industries, Incorporated | A micro speaker with symmetrical voice coil and magnetic circuit |
| US12010499B2 (en) | 2019-05-30 | 2024-06-11 | Harman International Industries, Incorporated | Micro speaker with symmetrical voice coil and magnetic circuit |
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