CN109831726B - Sound production device - Google Patents
Sound production device Download PDFInfo
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- CN109831726B CN109831726B CN201811640862.5A CN201811640862A CN109831726B CN 109831726 B CN109831726 B CN 109831726B CN 201811640862 A CN201811640862 A CN 201811640862A CN 109831726 B CN109831726 B CN 109831726B
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- voice coil
- vibrating diaphragm
- fixing arm
- diaphragm
- elastic
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Abstract
The invention discloses a sounding device, which comprises a basin frame, a vibration system and a magnetic circuit system, wherein the basin frame is provided with a basin opening; the vibration system comprises a vibrating diaphragm, a voice coil and an elastic supporting component, wherein the voice coil is fixed on the vibrating diaphragm to drive the vibrating diaphragm to vibrate and produce sound; the voice coil comprises a top end connected with the vibrating diaphragm, a bottom end opposite to the top end and a side wall connecting the top end and the bottom end; the elastic supporting assembly comprises an elastic piece, an auxiliary vibrating diaphragm connected with the elastic piece and a connecting framework respectively connected with the elastic piece and the auxiliary vibrating diaphragm, and the elastic piece is connected with one end of the voice coil, far away from the vibrating diaphragm, and is used for elastically suspending the voice coil below the vibrating diaphragm. Compared with the related art, the sound production device has good stability and excellent acoustic performance.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of electroacoustic conversion, in particular to a sounding device applied to a portable electronic product.
[ background of the invention ]
With the advent of the mobile internet age, the number of smart mobile devices is increasing. Among the mobile devices, the mobile phone is undoubtedly the most common and portable mobile terminal device. At present, the functions of mobile phones are very diverse, one of them is a high-quality music function, and therefore, a sound generating device for playing sound is widely applied to the current smart mobile devices.
The sound production device in the related art comprises a basin frame, a vibration system and a magnetic circuit system, wherein the vibration system and the magnetic circuit system are respectively fixed on the basin frame; vibration system is including being fixed in the vibrating diaphragm of basin frame, being fixed in the vibrating diaphragm inserts and locates the magnetic gap is in order to drive the voice coil loudspeaker voice coil and the one end of vibrating diaphragm vibration sound production are fixed in the basin frame, the other end is fixed in the voice coil loudspeaker voice coil is kept away from the elastic support subassembly of vibrating diaphragm one end.
However, in the sound generating device in the related art, the diaphragm and the elastic support assembly are respectively fixed to two opposite ends of the voice coil, and although the elastic support assembly can effectively prevent the voice coil from swinging laterally when vibrating, the design of the voice coil is limited due to the structure of directly connecting the diaphragm and the voice coil, and a magnetic steel cannot be arranged on one side where the elastic support assembly is arranged, that is, the volume of the magnetic circuit system is also limited, so that the improvement of acoustics of the sound generating device is limited.
Therefore, there is a need to provide a new sound generation device to solve the above technical problems.
[ summary of the invention ]
The invention aims to overcome the technical problems and provide a sound production device with good stability and good acoustic performance.
In order to achieve the above object, the present invention provides a sound production device, which comprises a basin frame, a vibration system and a magnetic circuit system, wherein the vibration system and the magnetic circuit system are respectively fixed on the basin frame; the vibration system comprises a vibrating diaphragm fixed on the basin frame, a voice coil fixed on the vibrating diaphragm and inserted in the magnetic gap to drive the vibrating diaphragm to vibrate and produce sound, and an elastic support assembly fixed on the basin frame and opposite to the vibrating diaphragm, wherein the voice coil comprises a top end connected to the vibrating diaphragm, a bottom end opposite to the top end, and a side wall connecting the top end and the bottom end; the elastic support assembly comprises an elastic part fixed on the basin frame, an auxiliary vibrating diaphragm connected with the elastic part and a connecting framework of the auxiliary vibrating diaphragm respectively, the elastic part and the connecting framework are connected with the outer side of the side wall respectively, and the elastic part and the connecting framework are jointly used for hanging the voice coil elasticity below the vibrating diaphragm.
Preferably, the elastic part comprises a first fixing arm fixed on the basin frame, a second fixing arm arranged at an interval with the first fixing arm, and an elastic arm connecting the first fixing arm and the second fixing arm; the auxiliary diaphragm comprises a vibrating part, a first connecting part and a second connecting part, wherein the first connecting part and the second connecting part extend from two opposite sides of the vibrating part respectively; the first connecting portion are connected to the first fixing arm, the second connecting portion are connected to the second fixing arm through the connecting framework, and the second fixing arm is connected to the side wall of the voice coil.
Preferably, the connection framework comprises a framework body spaced from the voice coil and two framework connection parts extending from two opposite ends of the framework body to the direction of the voice coil respectively; the framework body is connected with the second connecting portion, the framework connecting portion is connected with the second fixed arm, and the framework connecting portion is connected with the side wall of the voice coil.
Preferably, the first connecting portion are connected to one side of the first fixing arm, which is far away from the vibrating diaphragm, the framework body is connected to one side of the second connecting portion, which is close to the vibrating diaphragm, the second fixing arm is connected to two sides of the framework connecting portion, which are close to the vibrating diaphragm, and the second fixing arm and the two framework connecting portions are respectively abutted and fixed to the side wall of the voice coil.
Preferably, the bobbin connecting part includes a first section extending from opposite ends of the bobbin body to the voice coil direction, a second section extending from the first section to a direction away from the diaphragm, and a third section extending from an end of the second section away from the first section to the voice coil direction, and the second fixing arm is connected to the third section; the third section is connected to the side wall of the voice coil.
Preferably, the number of the elastic support assemblies is two, and the elastic support assemblies are respectively located on two opposite sides of the voice coil and enclose an accommodating space together with the voice coil.
Preferably, the bobbin body and the voice coil are separated by a bobbin connecting part and enclose the accommodating space together.
Preferably, the voice coil is of a rectangular structure, and the two elastic support assemblies are respectively located on two sides of a short shaft of the voice coil.
Preferably, the voice coil is of a rectangular structure with rounded corners, and each elastic support assembly is connected to two adjacent rounded corners of the voice coil respectively.
Preferably, the elastic part is a flexible circuit board; the connecting framework is made of any one of magnesium-aluminum alloy, carbon fiber and stainless steel.
Compared with the prior art, in the sound production device, the elastic support assembly comprises an elastic part, an auxiliary vibrating diaphragm connected to the elastic part and connecting frameworks connected to the elastic part and the auxiliary vibrating diaphragm respectively, the voice coil is connected with the vibrating diaphragm, and meanwhile the elastic part and the connecting frameworks are connected to the outer side of the side wall respectively to suspend the voice coil below the vibrating diaphragm in an elastic manner, so that the transverse swing of the voice coil during vibration is inhibited, and the stability of the voice coil is improved. In the structure, the voice coil and the auxiliary vibrating diaphragm are connected after transition of the connecting framework to form a linkage vibrating structure of the vibrating diaphragm and the auxiliary vibrating diaphragm, so that the vibrating effect is better, the elastic supporting component is connected to the voice coil and an accommodating space is formed between the elastic supporting component and the voice coil at intervals due to the transition of the connecting framework, and the magnetic steel can be arranged between the voice coil and the elastic supporting component while the auxiliary vibrating diaphragm of a complete structure is kept, so that a magnetic circuit system is maximized, and the acoustic performance of the sounding device is improved; and the height of the voice coil is not limited by the elastic supporting component any more, and the whole height of the sounding device can be designed to be thinner and lighter.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic perspective view of a sound device according to the present invention;
FIG. 2 is an exploded perspective view of the sound device of the present invention;
FIG. 3 is an exploded perspective view of the voice coil and the elastic support assembly of the sound device of the present invention;
fig. 4 is a schematic view of the assembly of the voice coil and the elastic support assembly of the sound device of the present invention.
FIG. 5 is an enlarged view of a portion B shown in FIG. 4
FIG. 6 is a schematic top view of a part of a three-dimensional structure of a sound device according to the present invention;
3 FIG. 3 7 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 31 3; 3
Fig. 8 is an enlarged view of a portion indicated by C in fig. 7.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a sound generating device 100, which includes a frame 1, a vibration system 2 and a magnetic circuit system 3.
The basin stand 1 is used for supporting the vibration system 2 and the magnetic circuit system 3.
The magnetic circuit system 3 has a magnetic gap 31, and the voice coil 22 is inserted in the magnetic gap 31.
Referring to fig. 3-5 and fig. 7-8, in this embodiment, the voice coil 22 includes a top end 221 connected to the diaphragm 21, a bottom end 222 opposite to the top end 221, and a sidewall 223 connecting the top end 221 and the bottom end 222; the elastic supporting component 23 includes an elastic member 231 fixed to the frame 1, an auxiliary diaphragm 232 connected to the elastic member 231, and a connection bobbin 233 respectively connected to the elastic member 231 and the auxiliary diaphragm 232, the elastic member 231 and the connection bobbin 233 are respectively connected to the side of the voice coil 22, and the elastic member 231 and the connection bobbin 233 are used together to elastically suspend the voice coil 22 below the diaphragm 21. It should be noted that, the connection between the auxiliary diaphragm 232 and the elastic member 231 may be a direct connection therebetween; the auxiliary diaphragm 232 and the elastic member 231 may be both fixed to the frame 1, and the two are indirectly connected through the frame 1.
Specifically, the method comprises the following steps: the elastic member 231 includes a first fixing arm 2311 fixed to the frame 1, a second fixing arm 2312 spaced apart from the first fixing arm 2311, and an elastic arm 2313 connecting the first fixing arm 2311 and the second fixing arm 2312.
The auxiliary diaphragm 232 includes a vibrating portion 2321, and a first connecting portion 2322 and a second connecting portion 2323 extending from two opposite sides of the vibrating portion 2321, respectively. The second connection portion 2323 is connected to the second fixing arm 2312 through the connection bobbin 233, and the second fixing arm 2312 is connected to the side wall 223 of the voice coil 22.
Preferably, the connection bobbin 233 includes a bobbin body 2331 spaced apart from the voice coil 22, and two bobbin connection portions 2332 extending from opposite ends of the bobbin body 2331 in a direction of the voice coil 22. At this time, the bobbin body 2331 is connected to the second connection portion 2323, the bobbin connection portion 2332 is connected to the second fixing arm 2312, and the bobbin connection portion 2332 is connected to the side wall 223 of the voice coil 22.
That is, the elastic member 231 is not completely connected to the auxiliary diaphragm 232, but a part of the elastic member 231 is connected to the auxiliary diaphragm 232, a part of the elastic member is connected to the connection bobbin 233, and the connection bobbin 233 is simultaneously connected to the auxiliary diaphragm 232, so as to form a bridge structure, and the voice coil 22 is further connected to the connection bobbin 233 or the elastic member 231, so that the diaphragm 21 and the auxiliary diaphragm 232 form a linkage vibration structure, and the vibration effect is better.
In the above structure, specifically, the first connecting portion 2322 is connected to a side of the first fixing arm 2311 away from the diaphragm 21, the bobbin body 2331 is connected to a side of the second connecting portion 2323 close to the diaphragm 21, the second fixing arm 2312 is connected to a side of the two bobbin connecting portions 2332 close to the diaphragm 21, and at this time, the second fixing arm 2312 and the two bobbin connecting portions 2332 are respectively abutted and fixed to the side wall 223 of the voice coil 22.
Of course, it is not limited thereto, such as: the first connecting portion 2322 is connected to a side of the first fixing arm 2311 away from the diaphragm 21, the bobbin body 2331 is connected to a side of the second connecting portion 2323 close to the diaphragm 21, and the second fixing arm 2312 is connected to sides of the two bobbin connecting portions 2332 away from the diaphragm 21. At this time, one end of the voice coil 22, which is far away from the diaphragm 21, is connected to the two bobbin connecting portions 2332. This is also possible.
In order to design the height of the voice coil 22 more flexibly and avoid the interference between the elastic support assembly 23 and the magnetic circuit system 3, the frame connecting portion 2332 may be further provided with a step structure to release a larger space for designing the magnetic circuit system 3. Such as:
the bobbin connecting portion 2332 includes a first section 23321 extending from opposite ends of the bobbin body 2331 in a direction of the voice coil 22, a second section 23322 extending from the first section 23321 in a direction away from the diaphragm 21, and a third section 23323 extending from an end of the second section 23322 away from the first section 23321 in a direction of the voice coil 22, and the second fixing arm 2312 is connected to the third section 23323; the third section 23323 is attached to the sidewall 223 of the voice coil 22. That is, the first, second and third segments 23321, 23322 and 23323 form a one-step structure, and the bobbin connecting portion 2332 allows the height of the voice coil to be designed to be smaller. The structure can realize different space release, and the magnetic circuit system 3 with different structures is arranged while the requirement of restraining the transverse swing of the voice coil 22 is met, so that the space is fully utilized.
Alternatively, the frame connecting portion 2332 includes a first section 23321 extending from opposite ends of the frame body 2331 to the direction of the voice coil 22, a second section 23322 extending from the first section 23321 to the direction close to the diaphragm 21, and a third section 23323 extending from one end of the second section 23322 far from the first section 23321 to the direction of the voice coil 22, and the second fixing arm 2312 is connected to the third section 23323. That is, the bobbin connecting portion 2332 allows the height of the voice coil to be designed to be larger.
Referring to fig. 6, in the present embodiment, the number of the elastic supporting components 23 is two, and the elastic supporting components 23 are respectively located at two opposite sides of the voice coil 22 and enclose the receiving space 10 together with the voice coil 22. Specifically, the bobbin body 2331 and the voice coil 22 are separated by the bobbin connecting portion 2332 and jointly enclose the receiving space 10.
In this embodiment, the voice coil 22 has a rectangular structure, and the two elastic support assemblies 23 are respectively located on two sides of the short axis of the voice coil 22. Of course, it is also possible that two of the elastic support members 23 are respectively located on both sides of the long axis of the voice coil 22.
That is, due to the design of the connection skeleton 233, it acts as a bridge structure, so that the voice coil 22 is connected to the elastic support component 23, and the two can be designed to be spaced apart from each other and enclose the receiving space 10. This structure releases the design restriction of the voice coil 22, so that the height of the voice coil 22 is not limited by the elastic support component 23, and the overall height of the sound generating device can be designed to be thinner and lighter. Meanwhile, the structure realizes that the accommodating space 10 is formed between the elastic support assembly 23 and the voice coil 22 while the auxiliary diaphragm 232 of the complete structure is reserved, and can be used for designing a magnetic steel structure, so that the volume of the magnetic circuit system 3 is enlarged to improve the driving force, and the acoustic performance of the sound production device 100 is improved.
Preferably, the voice coil 22 is a rectangular structure with rounded corners, and the same elastic support component 23 is respectively connected to two adjacent rounded corners of the voice coil 22.
In this embodiment, the elastic member 231 is a flexible printed circuit board. This structure can make the voice coil 22 with elastic component 231 is connected electrically, is used for providing the support to voice coil 22 on the one hand, on the other hand for voice coil 22 introduces external electric signal, has avoided through the lead wire for the problem of easy broken string when voice coil 22 introduces external electric signal, improves its reliability.
The connecting framework 233 is made of any one of magnesium aluminum alloy, carbon fiber and stainless steel, but not limited thereto, and is mainly made of low-density and high-hardness materials, so that the weight is reduced, the strength is increased, and the reliability is improved.
In the present embodiment, the voice coil 22 is illustrated as having a rectangular structure, and the elastic support members 23 are respectively located on both sides of the short axis of the voice coil 22. At this time, both sides of the long axis of the voice coil 22 can be used to design a magnetic steel structure, so as to increase the volume of the magnetic circuit system 3 to improve the magnetic field performance thereof.
As shown in fig. 6-7, for example, the magnetic circuit system 3 includes a magnetic yoke 32, a main magnetic steel 33 fixed to the magnetic yoke 32, and two first sub-magnetic steels 34 respectively disposed at two opposite sides of the main magnetic steel 33 at intervals and forming the magnetic gap 31 with the main magnetic steel 33; the first secondary magnetic steel 34 is located on both sides of the long axis of the voice coil 22. At this time, the magnetic circuit system 3 forms a magnetic circuit structure of three magnetic steels.
In order to further effectively utilize the space and enhance the volume of the magnetic circuit system 3, in the present embodiment, the magnetic circuit system 3 further includes two second secondary magnetic steels 35 respectively disposed at two opposite sides of the main magnetic steel 33 at intervals; the second pair of magnetic steels 35 is located on both sides of the short axis of the voice coil 22, and each of the second pair of magnetic steels 35 is located on the same side as the second pair of magnetic steels 23 and the accommodating space 10 between the voice coil 22. At this time, the magnetic circuit system 3 forms a magnetic circuit structure of five magnetic steels, and the driving performance is stronger, so that the vibration effect of the sound generating device 100 is better.
In order to further improve the performance of the magnetic circuit system 3, the magnetic lines of force of the magnetic circuit system 3 are cut by the voice coil 22 as much as possible to form a larger driving force, the magnetic circuit system 3 further includes an upper clamping plate 36, the upper clamping plate 36 includes a ring-shaped fixing ring 361 fixed to the frame 1 and pole cores 362 extending from the fixing ring 361 to the two first secondary magnetic steels 34, and each first secondary magnetic steel 34 is stacked on one pole core 362. Of course, four pole cores 362 may be stacked on the second secondary magnetic steel 35, which is also possible.
Compared with the prior art, in the sound production device, the elastic support assembly comprises an elastic part, an auxiliary vibrating diaphragm connected to the elastic part and connecting frameworks connected to the elastic part and the auxiliary vibrating diaphragm respectively, the voice coil is connected with the vibrating diaphragm, and meanwhile the elastic part and the connecting frameworks are connected to the outer side of the side wall respectively to suspend the voice coil below the vibrating diaphragm in an elastic manner, so that the transverse swing of the voice coil during vibration is inhibited, and the stability of the voice coil is improved. In the structure, the voice coil and the auxiliary vibrating diaphragm are connected after transition of the connecting framework to form a linkage vibrating structure of the vibrating diaphragm and the auxiliary vibrating diaphragm, so that the vibrating effect is better, the elastic supporting component is connected to the voice coil and an accommodating space is formed between the elastic supporting component and the voice coil at intervals due to the transition of the connecting framework, and the magnetic steel can be arranged between the voice coil and the elastic supporting component while the auxiliary vibrating diaphragm of a complete structure is kept, so that a magnetic circuit system is maximized, and the acoustic performance of the sounding device is improved; and the height of the voice coil is not limited by the elastic supporting component any more, and the whole height of the sounding device can be designed to be thinner and lighter.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A sounding device comprises a basin frame, a vibration system and a magnetic circuit system, wherein the vibration system and the magnetic circuit system are respectively fixed on the basin frame; the vibration system comprises a vibrating diaphragm fixed on the basin frame, a voice coil fixed on the vibrating diaphragm and inserted in the magnetic gap to drive the vibrating diaphragm to vibrate and produce sound, and an elastic support assembly fixed on the basin frame and opposite to the vibrating diaphragm, wherein the voice coil comprises an elastic part fixed on the basin frame, an auxiliary vibrating diaphragm connected to the elastic part, and a connecting framework connected to the elastic part and the auxiliary vibrating diaphragm respectively;
the elastic piece comprises a first fixing arm fixed on the basin frame, a second fixing arm arranged at an interval with the first fixing arm and an elastic arm connecting the first fixing arm and the second fixing arm; the auxiliary diaphragm comprises a vibrating part, a first connecting part and a second connecting part, wherein the first connecting part and the second connecting part extend from two opposite sides of the vibrating part respectively; the first connecting portion are connected to the first fixing arm, the second connecting portion are connected to the second fixing arm through the connecting framework, and the second fixing arm is connected to the side wall of the voice coil.
2. The sounding device according to claim 1, wherein the connection backbone comprises a backbone body spaced from the voice coil and two backbone connection portions extending from opposite ends of the backbone body towards the voice coil, respectively; the framework body is connected with the second connecting portion, the framework connecting portion is connected with the second fixed arm, and the framework connecting portion is connected with the side wall of the voice coil.
3. The sounding device according to claim 2, wherein the first connecting portion is connected to a side of the first fixing arm away from the diaphragm, the bobbin body is connected to a side of the second connecting portion close to the diaphragm, the second fixing arm is connected to a side of the two bobbin connecting portions close to the diaphragm, and the second fixing arm and the two bobbin connecting portions are respectively abutted and fixed to the side wall of the voice coil.
4. The sounding device according to claim 2, wherein the bobbin connecting portion includes a first section extending from opposite ends of the bobbin body to the voice coil direction, a second section extending from the first section to a direction away from the diaphragm, and a third section extending from an end of the second section away from the first section to the voice coil direction, and the second fixing arm is connected to the third section; the third section is connected to the side wall of the voice coil.
5. The sounding device according to claim 1, wherein the number of the elastic supporting components is two, and the elastic supporting components are respectively located at two opposite sides of the voice coil and enclose an accommodating space together with the voice coil.
6. The sounding device according to claim 5, wherein the bobbin body and the voice coil are separated by a bobbin connecting portion and together enclose the receiving space.
7. The sounding device according to claim 5, wherein the voice coil is rectangular, and the two elastic supporting components are respectively located at two sides of the short axis of the voice coil.
8. The sounding device according to claim 7, wherein the voice coil is a rectangular structure with rounded corners, and each of the elastic support members is connected to two adjacent rounded corners of the voice coil.
9. The sound production device of claim 1, wherein the resilient member is a flexible circuit board; the connecting framework is made of any one of magnesium-aluminum alloy, carbon fiber and stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811640862.5A CN109831726B (en) | 2018-12-29 | 2018-12-29 | Sound production device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811640862.5A CN109831726B (en) | 2018-12-29 | 2018-12-29 | Sound production device |
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| Publication Number | Publication Date |
|---|---|
| CN109831726A CN109831726A (en) | 2019-05-31 |
| CN109831726B true CN109831726B (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811640862.5A Expired - Fee Related CN109831726B (en) | 2018-12-29 | 2018-12-29 | Sound production device |
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| CN (1) | CN109831726B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110784803B (en) * | 2019-12-31 | 2020-05-05 | 共达电声股份有限公司 | Flexible circuit board and loudspeaker |
| CN212812021U (en) * | 2020-07-06 | 2021-03-26 | 瑞声科技(新加坡)有限公司 | Sound production device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462925A (en) * | 2018-01-04 | 2018-08-28 | 瑞声科技(新加坡)有限公司 | Microphone device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4569476B2 (en) * | 2006-01-17 | 2010-10-27 | パナソニック株式会社 | Speaker |
| US20080285787A1 (en) * | 2007-05-17 | 2008-11-20 | Sun Szu-Wei | Thin loudspeaker |
| CN205847562U (en) * | 2016-06-15 | 2016-12-28 | 瑞声科技(新加坡)有限公司 | Mini-sound device |
| CN207869351U (en) * | 2018-01-24 | 2018-09-14 | 瑞声科技(新加坡)有限公司 | Microphone device |
| CN108632727A (en) * | 2018-06-25 | 2018-10-09 | 歌尔股份有限公司 | Portable terminal |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462925A (en) * | 2018-01-04 | 2018-08-28 | 瑞声科技(新加坡)有限公司 | Microphone device |
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