CN206698425U - Sound-producing device - Google Patents
Sound-producing device Download PDFInfo
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- CN206698425U CN206698425U CN201720309051.1U CN201720309051U CN206698425U CN 206698425 U CN206698425 U CN 206698425U CN 201720309051 U CN201720309051 U CN 201720309051U CN 206698425 U CN206698425 U CN 206698425U
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- voice coil
- centring disk
- sound
- producing device
- bent area
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Abstract
It the utility model is related to a kind of sound-producing device.The sound-producing device includes voice coil loudspeaker voice coil and the centring disk located at voice coil loudspeaker voice coil bottom, the centring disk includes symmetrically arranged first centring disk and the second centring disk, the physical dimension of first centring disk and the second centring disk is different, is configured to the pliable asymmetry of vibration for making the voice coil loudspeaker voice coil overall.First centring disk and the second centring disk have first connecting portion, bent area and coil connection, the both ends of the bent area are connected with the first connecting portion and coil connection respectively, and first centring disk and the second centring disk are symmetrically distributed in the both sides of the voice coil loudspeaker voice coil.A technical problem to be solved in the utility model is vibrating diaphragm polarization problem caused by the asymmetric operatic tunes in sound-producing device module.
Description
Technical field
The utility model belongs to electroacoustic transduction technical field, specifically, the utility model is related to a kind of sound-producing device.
Background technology
Sound-producing device is the Electroacooustic power conversion device commonly used in Modern consumer electronics product, for converting the electrical signal to sound
Sound.Under the fast-developing technological trend of consumer electronics product, the performance of sound-producing device is also gradually developing, and adapts to electronics production
The update of product.
Vibrating diaphragm and voice coil loudspeaker voice coil in traditional sound-producing device are usually symmetrical expression design, and shape is based on rectangle, circle.With rectangle
Structure identical centring disk, in the case where not considering cavity body structure, centring disk energy are provided with exemplified by voice coil loudspeaker voice coil, around voice coil loudspeaker voice coil
It is enough to vibrating diaphragm provide balance vibration is pliable and rigid compensation, speaker system is reached whole machine balancing state.
But because the electronic products such as mobile phone, tablet personal computer constantly pursue lightening design so that sound-producing device module
Structure also increasingly complex and variation.So new sound-producing device module polygamy is equipped with baroque back cavity with before
Chamber.This chamber structure shows certain asymmetry.In this case, the sound system of sound-producing device module itself is in
Asymmetry, it is possible to cause vibrating diaphragm polarization phenomena occur.The polarization phenomena of vibrating diaphragm can make voice coil loudspeaker voice coil wiping occur to touch magnetic circuit, loose wire etc.
A series of problems, even if voice coil loudspeaker voice coil will not be damaged, problem is touched in wiping can also produce noise, reduce the acoustical behavior of sound-producing device, make it
Reliability reduces.
In order to solve the above technical problems, the mode of those skilled in the art's generally use has：In back cavity, acoustical cotton is set；Or
Person, add on vibrating diaphragm and apply damping glue etc..But the improvement of these modes is limited.It is therefore necessary to the sound system to sound-producing device
Or parts are improved, improve due to vibrating diaphragm polarization problem caused by the asymmetry of the operatic tunes.
Utility model content
A purpose of the present utility model is to provide a kind of improved sound-producing device.
According to one side of the present utility model, there is provided a kind of sound-producing device.The sound-producing device includes voice coil loudspeaker voice coil, Yi Jishe
Centring disk in voice coil loudspeaker voice coil bottom, the centring disk include symmetrically arranged first centring disk and the second centring disk, institute
The physical dimension difference of the first centring disk and the second centring disk is stated, the vibration for being configured to make the voice coil loudspeaker voice coil overall is not pliable right
Claim.
Alternatively, in addition to housing, the voice coil loudspeaker voice coil have a pair of long sides and a pair of short edges, and the voice coil loudspeaker voice coil is configured in institute
State in housing and vibrate；
First centring disk and the second centring disk have first connecting portion, bent area and coil connection, described
The both ends of bent area are connected with the first connecting portion and coil connection respectively, first centring disk and the second centering branch
Piece is symmetrically distributed in the both sides of the voice coil loudspeaker voice coil, and the first connecting portion is fixed in the housing, the coil connection with
The short side connection of the voice coil loudspeaker voice coil.
Alternatively, there is difference in height, first centring disk and institute between the first connecting portion and coil connection
The difference in height for stating the second centring disk is different.
Alternatively, the difference in height of the first centring disk is less than or equal to the two of the difference in height of the second centring disk
Times；
The difference in height of first centring disk is more than or equal to the half of the difference in height of the second centring disk.
Alternatively, the height of the bent area is the calibrated altitude of first, second centring disk, and the first connecting portion connects
The top of the bent area is connected on, the position where the coil connection is not higher than 2/3rds of the calibrated altitude, and
And not less than 1/3rd of the calibrated altitude.
Alternatively, length of the bent area of first centring disk along the long side and second centring disk is curved
Length of the folding area along the long side is different.
Alternatively, there is connected unit in the side wall of the housing, the first connecting portion is connected in the connected unit, the
One and second centring disk bent area length be less than or equal to the connected unit to voice coil loudspeaker voice coil distance；
The length of the bent area of first and second centring disks is more than or equal to the connected unit to the three of the distance of voice coil loudspeaker voice coil
/ mono-.
Alternatively, the length of the bent area of the first centring disk is less than or equal to the length of the bent area of the second centring disk
Three times；
The length of the bent area of first centring disk is more than or equal to three points of the length of the bent area of the second centring disk
One of.
Alternatively, width of first centring disk along the short side and second centring disk are along the short side
Width is different.
Alternatively, the width of first centring disk and the second centring disk is less than the length of the short side.
Alternatively, the width of first centring disk is more than or equal to a quarter of the width of the second centring disk；
The width of first centring disk is less than or equal to four times of the width of the second centring disk.
One of the present utility model has technical effect that, the pliable asymmetry of vibration of the sound-producing device.This vibrating diaphragm energy
The asymmetric sound-producing device module of chamber structure is enough adapted to, avoids polarization problem.
It is of the present utility model other by referring to the drawings to the detailed description of exemplary embodiment of the present utility model
Feature and its advantage will be made apparent from.
Brief description of the drawings
The accompanying drawing of a part for constitution instruction describes embodiment of the present utility model, and uses together with the description
In explanation principle of the present utility model.
Fig. 1 is the internal structure schematic top plan view of sound-producing device provided by the utility model；
Fig. 2 is the structural representation of centring disk of the present utility model；
Fig. 3 is the side sectional view of the sound-producing device in a kind of embodiment of the utility model；
Fig. 4 is the side sectional view of the sound-producing device in the utility model another embodiment；
Fig. 5 is the internal structure schematic top plan view of the sound-producing device in the utility model another embodiment.
Embodiment
Various exemplary embodiments of the present utility model are described in detail now with reference to accompanying drawing.It should be noted that：It is unless another
Illustrate outside, the part and the positioned opposite of step, numerical expression and numerical value otherwise illustrated in these embodiments is unlimited
The scope of the utility model processed.
The description only actually at least one exemplary embodiment is illustrative to be never used as to this practicality below
New and its application or any restrictions used.
It may be not discussed in detail for technology and equipment known to person of ordinary skill in the relevant, but in appropriate situation
Under, the technology and equipment should be considered as part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
The utility model provides a kind of sound-producing device, and the sound-producing device includes voice coil loudspeaker voice coil and determined located at voice coil loudspeaker voice coil bottom
Heart branch piece, the centring disk include symmetrically arranged first centring disk and the second centring disk.Especially, described first is fixed
Heart branch piece is different with the physical dimension of the second centring disk, so as to which the supporting force applied to the both sides of voice coil loudspeaker voice coil is different, makes institute
It is pliable and rigid asymmetric to state the overall vibration of voice coil loudspeaker voice coil.Correspondingly, the asymmetric sound-producing device module of acoustical cavity is coordinated, can
Sound-producing device system is set to reach the state of vibration balancing again.The problem of avoiding vibrating diaphragm from being polarized when working.
The sound-producing device can also include housing.As shown in figure 1, the housing 10 is determined for carrying the voice coil loudspeaker voice coil and first
Heart branch piece 201, the second centring disk 202.The voice coil loudspeaker voice coil can be with rectangular cyclic structure, or in racetrack structure.Voice coil loudspeaker voice coil has
There are a pair of long sides 11 and a pair of short edges 12.The voice coil loudspeaker voice coil is configured to vibrate in the housing 10.It can connect on the upside of voice coil loudspeaker voice coil
It is connected to vibrating diaphragm, diaphragm oscillations can be driven during voice coil vibrations, make diaphragm oscillations sounding.There can also be magnetic circuit system in sound-producing device
System, the magnetic circuit system are configured to that voice coil vibrations can be driven when being passed through voice signal in voice coil loudspeaker voice coil.For magnetic circuit system and shake
The design of film, the utility model are limited not to this, are configured according to actual product.In addition, the present invention is not yet
Long side and short side must be had by limiting the voice coil loudspeaker voice coil, for square or other shapes of vibrating diaphragm, can also use physical dimension
Different symmetrical centring disks, which is realized, vibrates pliable asymmetric effect.
As shown in Figure 1, 2, the centring disk 202 of the first centring disk 201 and second has first connecting portion 21, bending
Area 22 and coil connection 23.The first connecting portion 21 is used to be fixed in the housing 10.First connecting portion 21 can be straight
Connect on the housing 10, can also be connected on magnetic circuit system in succession, be indirectly fixed in housing 10, the utility model enters not to this
Row limitation.The coil connection 23 is then connected with the short side 12 of the voice coil loudspeaker voice coil.The both ends of the bent area 22 respectively with it is described
First connecting portion 21 and coil connection 23 connect, as shown in Figure 2.When the voice coil loudspeaker voice coil up-down vibration, the coil connection
23 together vibrate, and the bent area 22 then provides support and elastic recovery effect for voice coil loudspeaker voice coil and coil connection 23.Described first
Connecting portion 21 is fixed, plays the effect of being fixedly connected.The structure of the centring disk 202 of first centring disk 201 and second
Size is different, so as to which the supporting force applied to two short sides 12 of voice coil loudspeaker voice coil is different, makes the overall vibration of the voice coil loudspeaker voice coil pliable
With rigid asymmetry.
For example, the length of the bent area of the first centring disk and the second centring disk can be different, or width is different, from
And make the pliable asymmetry of vibration of two short sides of voice coil loudspeaker voice coil.This sound-producing device, which adapts to the operatic tunes, to be produced in the short side both sides of voice coil loudspeaker voice coil
The sound-producing device module of raw unbalanced air pressure.When sound-producing device module works, the physical dimension of first, second centring disk
Difference can balance the asymmetric phenomenon of air pressure of the operatic tunes, so that voice coil loudspeaker voice coil returns to the state of balance vibration.Further,
The polarization of voice coil loudspeaker voice coil can be eliminated, wipe the problems such as touching, improve the acoustical behavior of sound-producing device.Avoid voice coil loudspeaker voice coil and touch possibility because wiping
The problems such as caused broken string, loose wire.
In a kind of embodiment of the present utility model, as shown in figure 3, the first connecting portion 21 and voice coil loudspeaker voice coil of centring disk connect
Socket part 23 is not located in approximately the same plane.When first, second centring disk is arranged in sound-producing device, the first connecting portion
21 is different with the height where coil connection 23.There is difference in height between first connecting portion 21 and coil connection 23.Especially
Ground, the difference in height of the first centring disk 201 are different from the difference in height of the second centring disk 202.As shown in figure 3, the
The difference in height of one centring disk 201 is H1, and the difference in height of the second centring disk 202 is H2, and H2 is more than H1.In the reality
Apply in mode, the height difference H 1 of the first centring disk 201 is smaller, and rigidity is stronger, enables caused by the side that voice coil loudspeaker voice coil is attached thereto
Oscillation Amplitude is smaller.The height difference H 2 of second centring disk 202 is larger, and rigidity is weaker, is produced from the side that voice coil loudspeaker voice coil is attached thereto
Raw Oscillation Amplitude is larger.So, the overall pliable asymmetry of vibration of voice coil loudspeaker voice coil can be made, filled with adapting to the asymmetric sounding of the operatic tunes
Put module.
Alternatively, the height where the first connecting portion of the first and second centring disks can be consistent to pass through regulation
The height of coil connection adjusts the difference in height.When the coil connection is raised upwards, the difference in height reduces.
In this case, voice coil loudspeaker voice coil is easier vibration upwards, and is not easy to vibrate downwards, while Oscillation Amplitude is limited by centring disk
System.Opposite, when the coil connection reduces downwards, the difference in height increase.In this case, voice coil loudspeaker voice coil upwards and
Downward both direction is all without being restricted, it is easier to produces larger amplitude.Another optional mode is two centering branch
The coil connection of piece it is highly consistent, the difference in height is adjusted by the height for adjusting first connecting portion.
The utility model provides the relative scale scope between the difference in height of the first and second centring disks, determines when two
The difference in height of the heart branch piece when within the scope of relative scale of the present utility model, voice coil loudspeaker voice coil be sound-producing device overall performance can
It is higher to guarantee, reliability.Preferably, in the larger embodiment of the difference in height of the first centring disk, its difference in height is less than
Or two times of the difference in height equal to the second centring disk；In the less embodiment of difference in height of the first centring disk,
Its difference in height is more than or equal to the half of the difference in height of the second centring disk.The utility model is not intended to limit two centering branch
The difference in height of piece has to comply with aforementioned proportion relation, and aforementioned proportion relation is preferable scope.
Alternatively, first, second centring disk has calibrated altitude, the calibrated altitude by the bent area entirety
Highly determine.As shown in figure 3, the first connecting portion 21 is connected to the top of the bent area 22.The coil connection 23
Then it is located at the centre or bottom of the whole height of bent area 22, is generally not attached to the bottom of bent area 22.Alternatively, voice coil loudspeaker voice coil connects
Position where portion 23 is not higher than 2/3rds of the calibrated altitude, and not less than 1/3rd of the calibrated altitude.
Within the above range, first, second centring disk integrally has good deformability.But the utility model is not
The position of limitation coil connection 23 has to comply with above range requirement.Above range is preferable scope.
In another embodiment, the structure difference of first centring disk and the second centring disk passes through described curved
The length of folding area is different to be embodied.As shown in figure 4, length of the bent area 22 of first centring disk 201 along the long side 11
For L1, the length of the bent area 22 of second centring disk 202 along the long side 11 is L2.In the embodiment shown in Fig. 4
In, L2 is more than L1.The length of the bent area 22 is different, and the deformability embodied is also different.The longer bent area of length is firm
Property is weaker, and amplitude is relatively bigger caused by stress；Opposite, shorter stronger, the amplitude caused by stress of bent area rigidity of length
It is relatively smaller.By adjusting the length of the bent area, voice coil loudspeaker voice coil is set integrally to embody asymmetric vibration pliable.
Alternatively, as shown in figure 4, having connected unit in the side wall of the housing, the first connecting portion 21 is fixedly connected
In the connected unit.The utility model provides the preferred scope of the length of the bent area.Two centring disks it is described
The length of bent area is less than or equal to the connected unit to the distance of the voice coil loudspeaker voice coil；Also, the length of the bent area be more than or
Equal to 1/3rd of the distance of the connected unit to voice coil loudspeaker voice coil.The length of the bent area within the above range, can be shown
Good elastic deformation ability, ensure the reliability of sound-producing device.The length that the utility model is not intended to limit the bent area must
Must within the above range, above range is preferable scope.
The utility model additionally provides the relative scale model of the bending section length of the first centring disk and the second centring disk
Enclose.In the case where the length of the bent area of the first centring disk is longer, the length of its bent area is less than or equal to the second centering
Three times of the length of the bent area of branch piece.In the case where the length of the bent area of the first centring disk is shorter, its bent area
Length is more than or equal to 1/3rd of the bent area of the second centring disk.In the embodiment using aforementioned proportion scope,
The rigidity and deformability of first centring disk and the second centring disk will not have excessive difference, make voice coil loudspeaker voice coil overall appropriate
In the range of regulation vibrate pliable asymmetric degree, ensure the performance reliability of sound-producing device.The present invention is not intended to limit two
The length ratio of the bent area of centring disk has to comply with above range, and aforementioned proportion scope is preferable scope.
In another embodiment, the structure difference of first centring disk and the second centring disk passes through overall width
Spend different embodiments.As shown in figure 5, width of first centring disk 201 along the short side 12 and the described second centering branch
Width of the piece 202 along short side 12 is different.The width D 1 of first centring disk 201 is less than the width D 2 of the second centring disk 202.
The wider centring disk of the width active force required when deforming upon is bigger, and rigidity is stronger.By configuring, width is different to be determined
Heart branch piece, voice coil loudspeaker voice coil can be made to have asymmetric vibration pliable, to adapt to the asymmetric sound-producing device module of the operatic tunes.
Alternatively, the width of the centring disk 202 of the first centring disk 201 and second is less than the short side 12 of the voice coil loudspeaker voice coil
Length.As shown in figure 5, the width of first, second centring disk is on the length direction of short axle, all without departing from the short axle
Both ends.In other embodiments, the width of centring disk can also be made to be more than the length of short axle, the utility model is not intended to limit
The width of centring disk has to comply with above range.
Preferably, the utility model additionally provides the proportion of the width of the first centring disk and the second centring disk.
The a quarter of the minimum value, the preferably greater than or equal to width of the second centring disk of the width of first centring disk.Phase
Ying Di, the preferably lower than or equal to maximum of the width of the first centring disk, the four of the width of the second centring disk times.Using
In the embodiment of aforementioned proportion scope, the rigidity and deformability of the first centring disk and the second centring disk will not have
Big difference, the overall regulation in appropriate scope of voice coil loudspeaker voice coil is vibrated pliable asymmetric degree, ensure the performance of sound-producing device
Reliability.The width ratio that the present invention is not intended to limit two centring disks has to comply with above range, and aforementioned proportion scope is excellent
The scope of choosing.
Foregoing provide the mode of the structure of several change centring disks.By the way that with upper type, centring disk can be made
Rigidity and vibrate pliable difference so that the pliable asymmetry of vibration that voice coil loudspeaker voice coil is overall.The optional technology for changing structure above
Means can be combined with each other, so as to more accurately adjust the performance between two centring disks, to reach desired vibrating effect.
For example, can be by the different feature of the difference in height between the first connecting portion and coil connection spy different with the length of bent area
Sign combines in one embodiment.The utility model is not limited the combination of above-mentioned technological means.
Although some specific embodiments of the present utility model are described in detail by example, this area
It is to be understood by the skilled artisans that above example merely to illustrate, rather than in order to limit the scope of the utility model.This
Field it is to be understood by the skilled artisans that can not depart from the scope of the utility model and spirit in the case of, to above example
Modify.The scope of the utility model is defined by the following claims.
Claims (11)
1. a kind of sound-producing device, it is characterised in that the centring disk including voice coil loudspeaker voice coil and located at voice coil loudspeaker voice coil bottom, the centering branch
Piece includes symmetrically arranged first centring disk and the second centring disk, first centring disk (201) and the second centering branch
The physical dimension of piece (202) is different, is configured to the pliable asymmetry of vibration for making the voice coil loudspeaker voice coil overall.
2. sound-producing device according to claim 1, it is characterised in that also have a pair including housing (10), the voice coil loudspeaker voice coil
Long side (11) and a pair of short edges (12), the voice coil loudspeaker voice coil are configured to vibrate in the housing (10)；
First centring disk (201) and the second centring disk (202) have first connecting portion (21), bent area (22) and sound
Connecting portion (23) is enclosed, the both ends of the bent area (22) are connected with the first connecting portion (21) and coil connection respectively
(23), first centring disk (201) and the second centring disk (202) are symmetrically distributed in the both sides of the voice coil loudspeaker voice coil, described
First connecting portion (21) is fixed in the housing (10), and the coil connection (23) and the short side (12) of the voice coil loudspeaker voice coil connect
Connect.
3. sound-producing device according to claim 2, it is characterised in that the first connecting portion (21) and coil connection
(23) there is difference in height, first centring disk (201) is different from the difference in height of second centring disk (202) between.
4. sound-producing device according to claim 3, it is characterised in that the difference in height of the first centring disk (201) is small
In or equal to two times of the difference in height of the second centring disk (202)；
The difference in height of first centring disk (201) is more than or equal to the two of the difference in height of the second centring disk (202)
/ mono-.
5. sound-producing device according to claim 3, it is characterised in that the height of the bent area (22) is first, second
The calibrated altitude of centring disk, the first connecting portion (21) are connected to the top of the bent area (22), the voice coil loudspeaker voice coil connection
Position where portion (23) is not higher than 2/3rds of the calibrated altitude, and not less than the calibrated altitude three/
One.
6. sound-producing device according to claim 2, it is characterised in that the bent area of first centring disk (201)
(22) length along the length of the long side (11) and the bent area (22) of second centring disk (202) along the long side (11)
Degree is different.
7. sound-producing device according to claim 6, it is characterised in that there is connected unit (101) in the side wall of the housing,
The first connecting portion (21) is connected in the connected unit (101), the length of the bent area (22) of the first and second centring disks
Degree is less than or equal to the distance that the connected unit (101) arrives voice coil loudspeaker voice coil；
The length of the bent area (22) of first and second centring disks is more than or equal to the distance that the connected unit (101) arrives voice coil loudspeaker voice coil
1/3rd.
8. sound-producing device according to claim 6, it is characterised in that the bent area (22) of the first centring disk (201)
Length is less than or equal to three times of the length of the bent area (22) of the second centring disk (202)；
The length of the bent area (22) of first centring disk (201) is more than or equal to the bent area of the second centring disk (202)
(22) 1/3rd of length.
9. sound-producing device according to claim 2, it is characterised in that first centring disk (201) is along the short side
(12) width is different from width of second centring disk (202) along the short side (12).
10. sound-producing device according to claim 9, it is characterised in that first centring disk (201) and the second centering
The width of branch piece (202) is less than the length of the short side (12).
11. sound-producing device according to claim 9, it is characterised in that the width of first centring disk (201) is more than
Equal to a quarter of the width of the second centring disk (202)；
The width of first centring disk (201) is less than or equal to four times of the width of the second centring disk (202).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720309051.1U CN206698425U (en) | 2017-03-27 | 2017-03-27 | Sound-producing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720309051.1U CN206698425U (en) | 2017-03-27 | 2017-03-27 | Sound-producing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206698425U true CN206698425U (en) | 2017-12-01 |
Family
ID=60444220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720309051.1U Active CN206698425U (en) | 2017-03-27 | 2017-03-27 | Sound-producing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206698425U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110149585A (en) * | 2019-06-25 | 2019-08-20 | 嘉兴市迪贝斯电声有限公司 | Double branch piece loudspeakers and its adhering method with branch piece bracket loop |
| WO2021088929A1 (en) * | 2019-11-08 | 2021-05-14 | 歌尔股份有限公司 | Sound generating device |
| WO2021088913A1 (en) * | 2019-11-08 | 2021-05-14 | 歌尔股份有限公司 | Sound production apparatus |
-
2017
- 2017-03-27 CN CN201720309051.1U patent/CN206698425U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110149585A (en) * | 2019-06-25 | 2019-08-20 | 嘉兴市迪贝斯电声有限公司 | Double branch piece loudspeakers and its adhering method with branch piece bracket loop |
| CN110149585B (en) * | 2019-06-25 | 2024-06-04 | 嘉兴市迪贝斯电声有限公司 | Double-support-piece loudspeaker with support ring for support piece and bonding method thereof |
| WO2021088929A1 (en) * | 2019-11-08 | 2021-05-14 | 歌尔股份有限公司 | Sound generating device |
| WO2021088913A1 (en) * | 2019-11-08 | 2021-05-14 | 歌尔股份有限公司 | Sound production apparatus |
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