CN208300018U - A kind of sounding device - Google Patents
A kind of sounding device Download PDFInfo
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- CN208300018U CN208300018U CN201820630999.1U CN201820630999U CN208300018U CN 208300018 U CN208300018 U CN 208300018U CN 201820630999 U CN201820630999 U CN 201820630999U CN 208300018 U CN208300018 U CN 208300018U
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- sounding device
- voice coil
- straight channel
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Abstract
The utility model discloses a kind of sounding devices.The sounding device includes: center magnetic portion, and center magnetic portion has two opposite the first long sides and two opposite the second long sides, and the intersection of first long side and second long side has the first short straight flange；Side magnetic portion, side magnetic portion are looped around around center magnetic portion, and side magnetic portion is formed with straight channel at position corresponding with the described first short straight flange, and the two side walls of the straight channel are parallel；Vibration component, the vibration component include voice coil, and the voice coil is surrounded on around center magnetic portion, and side magnetic portion is located at the voice coil periphery.One of the utility model has technical effect that the resistance of speaking in sounding device is smaller.
Description
Technical field
The utility model belongs to electroacoustic transduction technical field, and in particular, to a kind of sounding device.
Background technique
The technology of consumer electronics product is quickly grown in recent years, and smart phone, tablet computer, virtual reality device etc. are
It is widely used in daily life.Related accessory in electronic product is also required to gradually improve, update, to meet consumption
Performance requirement of the person to electronic product.
Sounding device is electroacoustic converting member important in electronic product, for voice signal to be converted into sound.It is used
In components such as loudspeaker, earpiece, the earphones for constituting electronic product.Wherein, moving-coil type sounding device is extensive in electronic product
A kind of specific sounding device structure of application, can adapt to the various sounding demands of electronic product.
As the technology of electronic product develops, gradually start to improve sounding device using intelligent power amplifier schema
Output power.Correspondingly, sounding device can generate bigger amplitude under specific applicable cases, and sound output is stronger.
But the space inside existing moving-coil type sounding device is limited, is that the oscillation space that voice coil provides is smaller in magnetic circuit system.This
The resistance of speaking that kind fault of construction will cause magnetic circuit system is larger, even if vibration component produces bigger amplitude, sound effect
Promotion nevertheless suffer from certain restrictions, be unable to reach the desired effect of power amplification.
Therefore, it is necessary to improve to moving-coil type sounding device, the resistance of speaking of sounding device internal magnetic circuit system is reduced,
Improve the acoustical behavior of sounding device.
Summary of the invention
It is an object of the present invention to provide a kind of improved technology schemes of sounding device.
According to an aspect of the invention, there is provided a kind of sounding device, comprising:
Center magnetic portion, center magnetic portion has two opposite the first long sides and two opposite the second long sides, described
The intersection of first long side and second long side has the first short straight flange；
Side magnetic portion, side magnetic portion are looped around around center magnetic portion, side magnetic portion with the described first short straight flange
Straight channel is formed at corresponding position, the two side walls of the straight channel are parallel；
Vibration component, the vibration component include voice coil, and the voice coil is surrounded on around center magnetic portion, the side magnetic
Portion is located at the voice coil periphery.
Optionally, the side wall of the straight channel extends along the direction perpendicular to the described first short straight flange.
Optionally, the straight channel from it is described while magnetic portion close to center magnetic portion side perforation extend to described while magnetic
The periphery in portion.
Optionally, the magnet when magnetic portion includes four blocks, four blocks of side magnet successively surround and are distributed in center magnetic portion
Around, two ends of the side magnet have the first bevelled edge, and first bevelled edge constitutes the side wall of the straight channel, phase
Space between two adjacent the first bevelled edges constitutes the straight channel.
Optionally, it is described while magnetic portion further include be respectively arranged on four pieces it is described while magnet above four pieces of side magnetic conductive boards, it is described
The end of four pieces of side magnetic conductive boards has the second bevelled edge flushed with the first bevelled edge, and corresponding first bevelled edge and second is tiltedly
Trimming collectively forms the side wall of the straight channel.
Optionally, the vibration component includes vibrating diaphragm and support member, and the vibrating diaphragm is connected to a side of the voice coil
Portion, the support member are connected to the end side of the voice coil, and the support member is located in the straight channel.
Optionally, the voice coil and the shape in center magnetic portion match, and the voice coil includes two opposite thirds
Long side and two opposite the 4th long sides, the end close to each other of the third long side and the 4th long side have with it is described
The corresponding second short straight flange of first short straight flange；
The support member includes inner end, outer end and the elastic portion being connected between the inner end and the outer end；
The inner end is connected on the described second short straight flange, and the outer end is fixedly connected in the sounding device.
Optionally, the inner end of the support member is fixed on the end face of the described second short straight flange；
Alternatively, the inner end of the support member is fixed on the side wall of the described second short straight flange.
Optionally, the elastic portion is the arc convex structure of sheet, the protrusion direction direction of the arc convex structure
The vibrating diaphragm or the separate vibrating diaphragm.
Optionally, the both sides of the edge of the support portion are parallel to each other, and the support portion is along the straight channel from the sound
It encloses and extends to the periphery in side magnetic portion.
According to one embodiment of the disclosure, straight channel is formed in the side magnetic portion of sounding device, is reduced inside sounding device
Resistance of speaking.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
Detailed description of the invention
It is combined in the description and the attached drawing for constituting part of specification shows the embodiment of the present invention, and even
With its explanation together principle for explaining the present invention.
Fig. 1 is the explosive view for the sounding device that specific embodiment of the present invention provides；
Fig. 2 is the top view of the section components for the sounding device that specific embodiment of the present invention provides；
Fig. 3 is the schematic diagram of the supplement voice coil of structure shown in Fig. 2；
Fig. 4 is the fragmentary side cross-sectional view for the sounding device that specific embodiment of the present invention provides.
Specific embodiment
Carry out the various exemplary embodiments of detailed description of the present invention now with reference to attached drawing.It should also be noted that unless in addition having
Body explanation, the unlimited system of component and the positioned opposite of step, numerical expression and the numerical value otherwise illustrated in these embodiments is originally
The range of invention.
Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to the present invention
And its application or any restrictions used.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
The utility model provides a kind of improved sounding device, as shown in Figure 1, including magnetic portion in center in the sounding device
11, side magnetic portion 12 and vibration component.The sounding device increases sounding device by forming straight channel 121 in side magnetic portion 12
Internal space, reduces resistance of speaking.And then the Q value (quality factor) of sounding device is improved, improve acoustical behavior.
The basic element of character of center magnetic portion 11 and side magnetic portion 12 as magnetic circuit system in sounding device, is used to form drive
Moving field, to form activation force to voice coil.Center magnetic portion 11 has opposite two the first long sides and opposite two
The intersection of a second long side, first long side and second long side has the first short straight flange 111.First long side and second
Long side constitutes the long side and short side of similar rectangle, and the first short straight flange makes center magnetic portion generally octagonal structure.The side
Magnetic portion 12 is circumferentially positioned at around center magnetic portion 11.The first short straight flange 111 refers in the corner side in center magnetic portion 11
The side formed at wall position, curved wall position or other sidewall locations.From the plan structure in center magnetic portion 11
Observation, as shown in Fig. 2, the side wall shape that the first short straight flange 111 is connected relative to its both ends forms an angle.For example, the
One short straight flange 111 is formed in a rectangular side-walls in center magnetic portion 11, then the first short straight flange 111 and center magnetic portion 11
Two orthogonal side walls fold in obtuse angle.
Side magnetic portion 12 is then circumferentially positioned at around center magnetic portion 11, as shown in Figure 1, 2.Particularly, the side
Magnetic portion 12 is formed with straight channel 121 at position corresponding with the first of center magnetic portion 11 the short straight flange 111.Preferably,
The two side walls of the straight channel 121 are parallel to each other, and the side wall of the straight channel 121 formed by side magnetic portion 12 is along perpendicular to described
The direction of first short straight flange 111 extends.The straight channel forms the cushion space for sound transmission；Alternatively, being capable of forming confession
The channel of sound transmission.This design increases the space inside sounding device, can reduce and goes out acoustic resistance inside sounding device
Power.On the other hand, the first short straight flange is also formed in center magnetic portion, the first short straight flange is but also center magnetic portion can reduce its institute
The space occupied increases the inner space of sounding device.Particularly, the straight channel 121 and the first short straight flange that side magnetic portion 12 is formed
Position it is corresponding, straight channel and the first short straight flange combination can provide sufficient cushion space or propagate logical to be stiff
Road, and then the resistance of speaking inside sounding device is effectively reduced, increase Q value, achievees the effect that improve acoustical behavior.
The vibration component includes voice coil, and voice signal can be passed through in the voice coil.Voice coil surround and is set in described
Around heart magnetic portion, and side magnetic portion is then located at the periphery of voice coil.That is, voice coil is located between center magnetic portion and side magnetic portion.The voice coil
Vibration can be generated in the magnetic field that center magnetic portion and side magnetic portion generate after being passed through voice signal, and then drives vibration component
Other component vibrations occur.
Sounding device provided by the utility model passes through the features such as the first short straight flange in center magnetic portion, the straight channel in side magnetic portion
Compound action, effectively reduce sounding device internal structure resistance caused by sound transmission, improve acoustical behavior.Into one
Step ground, the generating device can adapt to the application in high power amplifier scheme.
Preferably, as shown in Figure 1, 2, the straight channel 121 can be from the one of the close center magnetic portion in side magnetic portion 12
Side penetrates through always the periphery for extending to side magnetic portion 12.In this way, straight channel 121 is capable of forming complete channel design, sounding device
It can also be formed on the outside of side magnetic portion 12 and let out the structures such as acoustic aperture, gap for air circulation.On the one hand, acoustic vibration can be
It is effectively buffered and is discharged in straight channel；Further, the pressure change that acoustic vibration generates can pass through straight channel reality
Existing pressure release, makes the air pressure balance inside and outside sounding device.By the design of this preferred straight channel, can further decrease
Resistance of speaking in sounding device, proposes high q-factor.
Preferably, in embodiment as shown in Figs. 1-3, the magnetic conduction iron when magnetic portion 12 includes four blocks.Four pieces of institutes
Side magnet is stated successively around being distributed in around center magnetic portion, and four pieces constitute the while magnetic portion for enclosing shape in a ring in magnet combination
12.Particularly, the end of the side magnet has the first bevelled edge 122, and first bevelled edge 122 is used as the straight channel
121 side wall.First bevelled edge of the end of two adjacent side magnet is close to each other but intermediate there are certain interval, the gaps
As the straight channel 121, the first bevelled edge 122 of two sides magnet end is oppositely arranged, and constitutes the position for limiting straight channel 121
Set the side wall with width.The advantages of this embodiment is, easy to assembly, and the width of straight channel, position in side magnetic portion
It is conveniently adjusted.Additional processing technology is executed without for straight channel in the magnetic portion of side.
Still optionally further, the magnetic conductive board when magnetic portion further includes.It is each described when being provided with one on magnet
Magnetic conductive board.Particularly, the shape in magnetic conductive board with it is described while magnet shape match.The end of four side magnetic conductive boards
Portion has the second bevelled edge flushed with first bevelled edge.When magnetic conductive board lid is located at described on magnet, described
One bevelled edge and the second bevelled edge being flush with it collectively form the side wall of the straight channel.By while magnet and while magnetic conductive board be total to
Height with the straight channel formed is higher, and resistance of speaking is smaller.
In other embodiments, side magnetic portion is also possible to a complete annular element, is directly set in
Around heart magnetic portion.The straight channel can be then made of the deep gouge being provided in the magnetic portion of side.Deep gouge can be from the inner edge in side magnetic portion
Edge extends to the periphery.
Specifically, in the embodiment shown in Fig. 1-3, center magnetic portion 11 is in class rectangle structure, and described first is short
Straight flange 111 is formed in the corner location in center magnetic portion 11, and side magnetic portion 12 is then around in class rectangle frame.It is practical new at this
In type, the class rectangle structure refer to the plan structure in center magnetic portion 11 in rectangular shape is similar to, only fraction region by
In with chamfering or bevel edge, to constitute and the slightly different local shape feature of rectangle.Such as center magnetic shown in FIG. 1 portion
11, the first short straight flange 111 is all formed on four corner locations in center magnetic portion 11, plan view shape is in octagonal, and described the
One short straight flange 111 removes four right angles corner of rectangle, forms shorter, inclined short straight flange.In addition, the utility model
It is not intended to limit in center magnetic portion 11 and specifically forms several knife rest bevel edges, in addition to embodiment shown in Fig. 1-3, at least also
It can be the forms such as two or one.Sounding device with the center magnetic portion in class rectangle structure is whole generally also at class rectangle
Structure, the structure are suitable for application in the electronic products such as mobile phone, tablet computer.By the side in the first short centrally disposed magnetic portion of straight flange
Angle Position also can more effectively save space, in a limited space the interior functional requirement for not only having met sounding device itself, but also to the greatest extent
It may be decreased the resistance of speaking of sounding device.
Further, as shown in Figure 1-3, it is described while magnetic portion 12 include four pieces while magnet.Side magnet is along center magnetic portion 11
Long straight flange extend, the end of side magnet extends close at the first short straight flange 111 in center magnetic portion 11.The end of side magnet has
There is the first bevelled edge 122, as shown in Fig. 2, the plan structure of the side magnet is in octagonal structure.The main part of side magnet is in
Strip extends along center magnetic portion 11, and end then passes through the position that the first bevelled edge 122 limits straight channel 121.
In a kind of optional embodiment, as shown in Fig. 1,4, the vibration component can also include vibrating diaphragm 22 and support
Component 23.The vibrating diaphragm 22 is used for practical sounding in vibration, and vibrating diaphragm 22 is connected on a side end of the voice coil 21, voice coil
21 by electromagnetic force when being vibrated, and is able to drive the vibration of vibrating diaphragm 22, and then generate sound.Opposite, the support portion
Part 23 is connected to the end side of the voice coil 21, as shown in Figure 4.The support member 23 is along the annular side of the voice coil 21
Length to extension is shorter, i.e., support member 23 is just connected on the local shorter region of voice coil 21.The support member 23
For providing support to voice coil 21, and play the role of guiding direction of vibration.By the way that support member 23 is arranged, it is able to suppress sound
The polarization phenomena that circle 21 may occur in vibration processes.Particularly, the support member 23 is located in the straight channel 121,
The straight channel 121 is that support member 23 provides installation space, and side magnetic portion 12 is by straight channel 121 to the formation of support member 23
Evacuation, avoids support member 23 that the collision of non-structural needs occurs with side magnetic portion 12 and contacts.
It is further preferred that the shape of the voice coil 21 can match with the shape in center magnetic portion 11.Such as such as Fig. 3 institute
Show, center magnetic portion 11 is in class rectangle structure, and the voice coil 21 is also in class rectangle structure.The voice coil 21 includes opposite
The end close to each other of two third long sides and two opposite the 4th long sides, the third long side and the 4th long side has
There is second short straight flange 211 corresponding with the described first short straight flange 111.Voice coil 21 is configured to knot identical with center magnetic portion 11
It is configured shape, can be improved uniform, the balanced degree of active force suffered by voice coil 21, and then it is existing to inhibit voice coil 21 that polarization occurs
As.The voice coil 21 is formed with the second short straight flange 211 at position corresponding with the described first short straight flange 111, as shown in Figure 3.
Particularly, the support member 23 can connect on the described second short straight flange 211.The short straight flange 111 of the first of center magnetic portion 11,
The short straight flange 211 of the second of voice coil 21 is corresponding with 121 position of straight channel, and support member 23 is connected to the of voice coil 21
It is convenient for extending to support member 23 in straight channel 121 on two short straight flanges 211.It is designed by this structure, on the one hand can be saved
Save sounding device integrally occupied space, the layout of reasonably optimizing components；On the other hand, it can be improved the stabilization of voice coil
Property, improve the vibration performance of voice coil.
The support member 23 can be placed in the straight channel 121, correspondingly, optional embodiment as shown in Figure 1,
The both sides of the edge of the support member 23, which can be, to be parallel to each other, when support member 23 is connected on voice coil 21 and loaded on straight-through
When in road 121, the structure of support member 23 is in the shape that the periphery along the straight channel 121 from voice coil 21 to side magnetic portion 12 extends
Formula.The width of the support member 23 can be slightly less than the width of straight channel 121, avoid support member 23 and straight channel 121
Side wall collides, rubs.
The support member preferably includes inner end, outer end and the elastic portion being connected between the inner end and outer end.Institute
It states inner end to be connected on the described second short straight flange, the outer end is then fixedly connected in the sounding device.The elastic portion energy
Elastic deformation is enough generated, when voice coil vibrations work, the inner end of the support member can vibrate together with voice coil, the outer end
It is then fixed in sounding device, elastic portion plays the role of elastic connection.
The present invention does not limit the type of attachment for being connected to the second short straight flange of the inner end of support member.Optionally,
The inner end can be fixed on the end face of the described second short straight flange；Alternatively, the side wall of the described second short straight flange can be fixed on
On.
Optionally, the elastic portion can be the sheet arc convex structure extended from the outer end of support member to inner end,
As shown in Fig. 1,4, which is similar to the ring structure of vibrating diaphragm.The protrusion direction of the sheet arc convex structure can be court
To the direction of the vibrating diaphragm, it is also possible to the direction departing from vibrating diaphragm.The elastic portion of this embodiment is capable of providing bigger
Traction force plays the role of certain restrictions to the vibration of float portion and voice coil.Moreover, being more convenient in this elastic portion lays electricity
Road.
Optionally, sounding device can also include lower magnetic conductive board 13, and the lower magnetic conductive board 13 can be to center magnetic portion and side
Polymerization, gathering are played the role of in the magnetic field that magnetic portion generates, to enhance the intensity of the magnetic gap between center magnetic portion and side magnetic portion
And uniformity coefficient.Center magnetic portion and side magnetic portion are arranged above the lower magnetic conductive board 13.Preferably, as shown in Figure 1-3, institute
Stating could be formed with recessed portion 131 on lower magnetic conductive board 13, the recessed portion 131 is located at the bottom of the straight channel 121.It is described recessed
Concave portion 131 can be used for constituting the bottom of the straight channel 121.The recessed portion 131 is located in straight channel 121 for avoiding
Support member 23 drives support member 23 to collide on the lower magnetic conductive board 13 when voice coil 21 being avoided to vibrate.The recessed portion 131
The position that reflexed ring may be set can also be evenly distributed on for being formed at the position for being provided with reflexed ring.This reality
The position of recessed portion on lower magnetic conductive board, quantity are not limited with novel.It can be according to the topology requirement of actual product
It is configured.Further, by forming recessed portion on lower magnetic conductive board, additionally it is possible to increase the space in sounding device, thus
The resistance of speaking for reducing magnetic circuit system improves the Q value of sounding device, improves acoustical behavior.
In addition, the utility model is not intended to limit the specific generation type in center magnetic portion and side magnetic portion.For example, in Fig. 1
Shown in embodiment, center magnetic portion 11 can be one block of centring magnet, the magnet when magnetic portion 12 then can be four blocks.
In other embodiments, center magnetic portion can be one block of centring magnet, side magnetic portion then can from from lower magnetic conductive board to
On the side wall that is bent to form constitute；Alternatively, center magnetic portion is formed by one block of T shape magnet, side magnetic portion is then by being set in T shape magnetic
Annular magnetic conductive part on iron is constituted.
Optionally, the sounding device can also include shell 3, as shown in Fig. 1,4.The shell 3 is configurable for
Carry the vibration component and center magnetic portion 11 and side magnetic portion 12.Center magnetic portion 11 and side magnetic portion 12 can fix erection
On the shell 3, the peripheral edge of the vibrating diaphragm 22 can be then fixedly connected on the shell 3, and the voice coil 21 connects
In the central area of vibrating diaphragm 22, voice coil 21 is suspended between center magnetic portion 11 and side magnetic portion 12.Further, the support member 23
Outer end can also be fixedly connected on the shell 3, inside edge is then connected on voice coil 21, to voice coil 21 formed support.
Although some specific embodiments of the invention are described in detail by example, the skill of this field
Art personnel it should be understood that example above merely to being illustrated, the range being not intended to be limiting of the invention.The skill of this field
Art personnel are it should be understood that can without departing from the scope and spirit of the present invention modify to above embodiments.This hair
Bright range is defined by the following claims.
Claims (10)
1. a kind of sounding device characterized by comprising
Center magnetic portion, center magnetic portion have two opposite the first long sides and two opposite the second long sides, described first
The intersection of long side and second long side has the first short straight flange；
Side magnetic portion, side magnetic portion are looped around around center magnetic portion, and side magnetic portion is opposite with the described first short straight flange
Straight channel is formed at the position answered, the two side walls of the straight channel are parallel；
Vibration component, the vibration component include voice coil, and the voice coil is surrounded on around center magnetic portion, side magnetic position
In the voice coil periphery.
2. sounding device according to claim 1, which is characterized in that the side wall of the straight channel is along perpendicular to described first
The direction of short straight flange extends.
3. sounding device according to claim 1, which is characterized in that the straight channel is from side magnetic portion in described
The side perforation in heart magnetic portion extends to the periphery in side magnetic portion.
4. sounding device according to claim 1, which is characterized in that the magnet when magnetic portion includes four blocks, four pieces of sides
For magnet successively around being distributed in around center magnetic portion, two ends of the side magnet have the first bevelled edge, and described the
One bevelled edge constitutes the side wall of the straight channel, and the space between two adjacent the first bevelled edges constitutes the straight channel.
5. sounding device according to claim 4, which is characterized in that side magnetic portion further includes being respectively arranged on described in four pieces
Magnetic conductive board when four pieces above magnet, the end of four pieces of side magnetic conductive boards have the second beveling flushed with the first bevelled edge
Side, corresponding first bevelled edge and the second bevelled edge collectively form the side wall of the straight channel.
6. sounding device according to claim 1, which is characterized in that the vibration component includes vibrating diaphragm and support member,
The vibrating diaphragm is connected to a side end of the voice coil, and the support member is connected to the end side of the voice coil, described
Support member is located in the straight channel.
7. sounding device according to claim 6, which is characterized in that the shape phase of the voice coil and center magnetic portion
Match, the voice coil includes two opposite third long sides and two opposite the 4th long sides, the third long side and the described 4th
The end close to each other of long side has the second short straight flange corresponding with the described first short straight flange；
The support member includes inner end, outer end and the elastic portion being connected between the inner end and the outer end；
The inner end is connected on the described second short straight flange, and the outer end is fixedly connected in the sounding device.
8. sounding device according to claim 7, which is characterized in that the inner end of the support member is fixed on described second
On the end face of short straight flange；
Alternatively, the inner end of the support member is fixed on the side wall of the described second short straight flange.
9. sounding device according to claim 7, which is characterized in that the elastic portion is the arc convex structure of sheet,
The protrusion direction of the arc convex structure is towards the vibrating diaphragm or far from the vibrating diaphragm.
10. sounding device according to claim 7, which is characterized in that the both sides of the edge of the support portion are parallel to each other, institute
It states support portion and extends along the straight channel from the voice coil to the periphery in side magnetic portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820630999.1U CN208300018U (en) | 2018-04-28 | 2018-04-28 | A kind of sounding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820630999.1U CN208300018U (en) | 2018-04-28 | 2018-04-28 | A kind of sounding device |
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| Publication Number | Publication Date |
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| CN208300018U true CN208300018U (en) | 2018-12-28 |
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| CN201820630999.1U Active CN208300018U (en) | 2018-04-28 | 2018-04-28 | A kind of sounding device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021115031A1 (en) * | 2019-12-13 | 2021-06-17 | 歌尔股份有限公司 | Sound production apparatus and electronic device |
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2018
- 2018-04-28 CN CN201820630999.1U patent/CN208300018U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021115031A1 (en) * | 2019-12-13 | 2021-06-17 | 歌尔股份有限公司 | Sound production apparatus and electronic device |
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