CN109275075B - Sound production device - Google Patents
Sound production device Download PDFInfo
- Publication number
- CN109275075B CN109275075B CN201811162942.4A CN201811162942A CN109275075B CN 109275075 B CN109275075 B CN 109275075B CN 201811162942 A CN201811162942 A CN 201811162942A CN 109275075 B CN109275075 B CN 109275075B
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- CN
- China
- Prior art keywords
- voice coil
- fixed
- support
- diaphragm
- elastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 230000000712 assembly Effects 0.000 claims description 8
- 210000002356 Skeleton Anatomy 0.000 description 6
- 230000000694 effects Effects 0.000 description 1
- 230000003405 preventing Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
Abstract
The invention provides a sounding device, which comprises a basin frame, a vibration system and a magnetic circuit system with a magnetic gap, wherein the basin frame is provided with a plurality of through holes; the vibration system comprises a vibration diaphragm fixed on the basin frame, a voice coil for driving the vibration diaphragm to vibrate and sound, an elastic support component fixed on the basin frame and opposite to the vibration diaphragm and arranged at intervals, and a support framework arranged at intervals with the voice coil, wherein one end of the support framework is connected with the vibration diaphragm, and the other end of the support framework is connected with the elastic support component; the support framework comprises two support frameworks, the two support frameworks are respectively located on two opposite sides of the voice coil, the voice coil is in a round corner rectangle and comprises four straight sides and four round corners respectively connected with the two adjacent straight sides, and the support frameworks are opposite to the straight sides of the voice coil and the round corners at two ends of the straight sides. 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 acoustoelectrics, 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 current smart mobile devices such as mobile phones.
The sound production device in the related art comprises a basin frame, a vibration system fixed on the basin frame and a magnetic circuit system for driving the vibration system to vibrate and produce sound; vibration system is including being fixed in the vibrating diaphragm of basin frame, drive the voice coil loudspeaker voice coil of vibrating diaphragm vibration sound production and with the vibrating diaphragm is relative and the interval sets up and will the voice coil loudspeaker voice coil support in the elastic support subassembly of basin frame.
However, in the sound generating device of 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 lateral vibration of the voice coil during vibration, the structure of the elastic support assembly directly connected to the voice coil causes limitations on the design of the voice coil, and the volume of the magnetic circuit system is also limited, so that the acoustic improvement 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 provide a sounding device with good stability and excellent 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, an elastic support component fixed on the basin frame and opposite to the vibrating diaphragm and arranged at intervals, and a support framework arranged at intervals with the voice coil; one end of the support framework is connected with the vibrating diaphragm, and the other end of the support framework is connected with the elastic support component; the voice coil is in a round corner rectangle and comprises four straight edges and four round corners respectively connected with the two adjacent straight edges, and the straight edges of the voice coil and the round corners at the two ends of the straight edges are arranged oppositely.
Preferably, the two support skeletons are respectively located at the inner sides of the voice coils.
Preferably, the two support skeletons are respectively located at the outer sides of the voice coil.
Preferably, one side of the elastic support component, which is far away from the diaphragm, is farther away from the diaphragm than one side of the voice coil, which is far away from the diaphragm.
Preferably, the elastic support components are arranged together to form a hollow area, and one end of the voice coil, which is far away from the diaphragm, is located in the range of the hollow area.
Preferably, the support framework is of an arc-shaped structure.
Preferably, the elastic support component comprises two elastic support components and is respectively located on two opposite sides of the voice coil, each elastic support component comprises an elastic part and is fixed to the elastic part in a fitting manner, the elastic part is far away from the auxiliary vibrating diaphragm on one side of the vibrating diaphragm, and the support framework is fixed to one side of the elastic part, which is close to the vibrating diaphragm.
Preferably, the elastic part comprises a first fixing arm fixed on the basin frame, a second fixing arm supporting and fixing the supporting framework on the same side of the basin frame, and an elastic arm extending from the first fixing arm to the second fixing arm and connected with the second fixing arm; the auxiliary vibrating diaphragm comprises a folding ring with an arc-shaped cross section, and a first connecting part and a second connecting part which respectively extend from two opposite sides of the folding ring, wherein the first connecting part is fixed on one side of the first fixing arm far away from the support framework, and the second connecting part is fixed on one side of the second fixing arm far away from the support framework, so that the folding ring and the elastic arm are oppositely arranged; the support framework is fixed on the second fixing arm.
Preferably, the elastic member is a flexible circuit board.
Preferably, the magnetic circuit system comprises a magnetic yoke, main magnetic steel fixed on the magnetic yoke, and two auxiliary magnetic steels respectively arranged at intervals on two opposite sides of the main magnetic steel and forming the magnetic gap with the main magnetic steel, and the two auxiliary magnetic steels are respectively located between the two elastic support assemblies.
Preferably, the two auxiliary magnetic steels are located on two sides of the long axis of the voice coil, and the two elastic supporting assemblies are located on two sides of the short axis of the voice coil.
Preferably, the magnetic circuit system further comprises an upper clamping plate, the upper clamping plate comprises an annular fixing ring fixed on the basin frame and two pole cores extending from the fixing ring to the auxiliary magnetic steel, and the two pole cores are respectively stacked on the two auxiliary magnetic steels.
Compared with the prior art, the vibration system of the sound production device further comprises a support framework arranged at an interval with the voice coil, one end of the support framework is connected with the vibrating diaphragm, and the other end of the support framework is connected with the elastic support component; the voice coil is in a round corner rectangle and comprises four straight sides and four round corners respectively connected with the two adjacent straight sides, and the support frameworks are opposite to the straight sides of the voice coil and the round corners at two ends of the straight sides. The structure enables the elastic supporting component and the vibrating diaphragm to be connected to the supporting framework, the height of the voice coil is not limited by the vibration space of the elastic supporting component any more, and the overall height of the sounding device can be designed to be thinner and lighter; meanwhile, the voice coil is not in contact with the elastic supporting assembly, so that the gap between the voice coil and the magnetic circuit system is not influenced, the magnetic circuit system can realize a maximized multi-magnetic steel three-magnetic circuit structure, and finally, the acoustic performance of the sound production device is effectively improved.
[ 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 a schematic bottom view of a part of a three-dimensional structure of a sound device according to the present invention;
FIG. 4 is a sectional view taken along line A-A of FIG. 1;
FIG. 5 is a schematic perspective view of a vibration system of the sound device of the present invention;
FIG. 6 is an enlarged view of the portion indicated by B in FIG. 5;
FIG. 7 is a schematic perspective view of an elastic support assembly of the sound device of the present invention;
FIG. 8 is an exploded perspective view of the resilient support assembly of the sound device of the present invention;
fig. 9 is a schematic perspective view of a support frame of the sound device of the present invention.
[ 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 to 9, the present invention provides a sound production device 100, which includes a frame 1, a vibration system 2 and a magnetic circuit system 3 respectively fixed to the frame 1.
The basin frame 1 is used for supporting the vibration system 2 and the magnetic circuit system 3, and the magnetic circuit system 3 is used for driving the vibration system 2 to vibrate and sound.
The vibration system 2 comprises a vibrating diaphragm 21 fixed on the basin frame 1, a voice coil 22 for driving the vibrating diaphragm 21 to vibrate and sound, an elastic supporting component 23 fixed on the basin frame 1 and opposite to the vibrating diaphragm 21 and arranged at intervals, and a supporting framework 24.
The magnetic circuit system 3 has a magnetic gap 36, and the voice coil 22 is inserted in the magnetic gap 36.
In this embodiment, the support frame 24 includes two arc-shaped structures, one end of the support frame 24 is connected to the vibrating diaphragm 21, and the other end of the support frame is connected to the elastic support component 23; the two support skeletons 24 are respectively located on two opposite sides of the voice coil 22, the voice coil 22 is in a round corner rectangle and comprises four straight sides and four round corners respectively connected with the two adjacent straight sides, and the support skeletons 24 are opposite to the straight sides of the voice coil 22 and the round corners at two ends of the straight sides. The structure enables the elastic supporting component 23 and the diaphragm 21 to be connected to the supporting framework 24, the height of the voice coil 22 is no longer limited by the vibration space of the elastic supporting component 23, and the overall height of the sound generating device 100 can be designed to be thinner and lighter; meanwhile, the voice coil 22 does not contact the elastic support assembly 23, so that the gap between the voice coil 22 and the magnetic circuit is not affected, the magnetic circuit system 3 can realize a maximized multi-magnetic-steel three-magnetic-circuit structure, and finally, the acoustic performance of the sound production device 100 is effectively improved.
The two support skeletons 24 are respectively located outside the voice coil 22. Of course, the two supporting skeletons 24 may be located inside the voice coil 22. The present embodiment will be described by taking an example in which only two support frames 24 are located outside the voice coil 22.
The side of the elastic supporting component 23 away from the diaphragm 21 is farther away from the diaphragm 21 than the side of the voice coil 22 away from the diaphragm 21. In this configuration the resilient support member 23 is not flush with the bottom end of the voice coil 22.
The elastic supporting components 23 jointly enclose a hollow area 10, and one end of the voice coil 22 far away from the diaphragm 21 is located in the range of the hollow area 10. So that the voice coil 22 is not limited by the space between the voice coil and the elastic support member 23, and the influence of the elastic support member 23 on the magnetic circuit is avoided.
In this embodiment, the two elastic support assemblies 23 are respectively located at two opposite sides of the voice coil 22, and the two elastic support assemblies 23 respectively support the voice coil 22 on the frame 1 through the two support frames 24. The arrangement of the double-elastic supporting component 23 forms a symmetrical structure, so that the supporting effect on the voice coil 22 is more stable, and the transverse swing preventing effect of the voice coil 22 is better.
Each elastic supporting component 23 includes an elastic component 231 and an auxiliary diaphragm 232 attached to and fixed to the elastic component 231 at a side far from the diaphragm 21, and the supporting frame 24 is fixed to the elastic component 231 at a side near the diaphragm 21. The elastic support component 23 is used for damping the swing of the vibration system 2 in the working state.
Specifically, the elastic member 231 is a flexible printed circuit board, and the voice coil 22 is electrically connected to the elastic member 231. On one hand, the voice coil 22 is supported, and on the other hand, external electric signals are introduced into the voice coil 22, so that the problem that the wires are easily broken when the external electric signals are introduced into the voice coil 22 through a lead is solved, and the reliability of the voice coil is improved.
The elastic member 231 includes a first fixing arm 2311 fixed to the frame 1, a second fixing arm 2312 supporting and fixed to the supporting frame 24 on the same side thereof, and a resilient arm 2313 extending from the first fixing arm 2311 to the second fixing arm 2312 and connected to the second fixing arm 2312; the auxiliary diaphragm 232 includes a corrugated ring 2321 with an arc-shaped cross section, and a first connection portion 2322 and a second connection portion 2323 respectively extending from two opposite sides of the corrugated ring 2321, where the first connection portion 2322 is fixed to one side of the first fixing arm 2311 away from the support frame 24, and the second connection portion 2323 is fixed to one side of the second fixing arm 2312 away from the support frame 24, so that the corrugated ring 2321 is disposed opposite to the elastic arm 2313; the support frame 24 is fixed to the second fixing arm 2312. In such a structure, the elastic support component 23 does not affect the magnetic gap, the design of the magnetic circuit system is optimized, so that the acoustic performance of the sound production device 100 is better, and meanwhile, the arrangement of the elastic support component 23 is convenient for improving the stability of the vibration system 2.
The magnetic circuit system 3 comprises a magnetic yoke 31, a main magnetic steel 32 fixed on the magnetic yoke 31, and two secondary magnetic steels 33 respectively arranged on two opposite sides of the main magnetic steel 32 at intervals and forming the magnetic gap 36 with the main magnetic steel 32; the two auxiliary magnetic steels 33 are respectively located between the two elastic support components 23.
In this embodiment, the voice coil 22 is a rectangular structure with rounded corners, the two auxiliary magnetic steels 33 are located on two sides of the long axis of the voice coil 22, and the two elastic support assemblies 23 are located on two sides of the short axis of the voice coil 22. At this time, the magnetic circuit system 3 forms a magnetic circuit structure of three magnetic steels, and the driving performance of the magnetic circuit structure is stronger than that of a single magnetic steel magnetic circuit structure.
It should be noted that, it is also possible that the two secondary magnetic steels 33 are respectively located at the same positions as the two elastic support assemblies 23, and are located on both sides of the short axis of the voice coil 22.
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 magnetic circuit space, the magnetic circuit system 3 further includes an upper clamp plate 34, the upper clamp plate 34 includes a ring-shaped fixing ring 341 fixed to the frame 1 and two pole cores 342 extending from the fixing ring 341 to the secondary magnetic steel 33, and the two pole cores 342 are respectively stacked on the two secondary magnetic steels 33.
Compared with the prior art, the vibration system of the sound production device further comprises a support framework arranged at an interval with the voice coil, one end of the support framework is connected with the vibrating diaphragm, and the other end of the support framework is connected with the elastic support component; the voice coil is in a round corner rectangle and comprises four straight sides and four round corners respectively connected with the two adjacent straight sides, and the support frameworks are opposite to the straight sides of the voice coil and the round corners at two ends of the straight sides. The structure enables the elastic supporting component and the vibrating diaphragm to be connected to the supporting framework, the height of the voice coil is not limited by the vibration space of the elastic supporting component any more, and the overall height of the sounding device can be designed to be thinner and lighter; meanwhile, the voice coil is not in contact with the elastic supporting assembly, so that the gap between the voice coil and the magnetic circuit system is not influenced, the magnetic circuit system can realize a maximized multi-magnetic steel three-magnetic circuit structure, and finally, the acoustic performance of the sound production device is effectively improved.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (12)
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 sound, and an elastic supporting component fixed on the basin frame, opposite to the vibrating diaphragm and arranged at intervals, and is characterized by further comprising a supporting framework arranged at intervals with the voice coil, wherein one end of the supporting framework is connected with the vibrating diaphragm, and the other end of the supporting framework is connected with the elastic supporting component; the voice coil is in a round corner rectangle and comprises four straight sides and four round corners respectively connected with the two adjacent straight sides, and the support frameworks are opposite to the straight sides of the voice coil and the round corners at two ends of the straight sides.
2. The sounder device according to claim 1, wherein two of the support armatures are located inside the voice coil, respectively.
3. The sounder device according to claim 1, wherein two of the support armatures are located outside of the voice coil, respectively.
4. The sounder device according to claim 1, wherein a side of the resilient support assembly remote from the diaphragm is further from the diaphragm than a side of the voice coil remote from the diaphragm.
5. The sounding device according to claim 1, wherein the resilient support members collectively define a hollow region, and an end of the voice coil remote from the diaphragm is located within the hollow region.
6. The sounder device according to claim 1, wherein the support framework is arcuate in configuration.
7. The sounding device according to claim 1, wherein the elastic supporting assembly includes two elastic supporting assemblies respectively located at two opposite sides of the voice coil, each of the elastic supporting assemblies includes an elastic member and an auxiliary diaphragm attached to the elastic member and located at a side of the elastic member away from the diaphragm, and the supporting framework is fixed to a side of the elastic member close to the diaphragm.
8. The sounder device according to claim 7, wherein the resilient member comprises a first fixed arm fixed to the frame, a second fixed arm supporting the support frame fixed to the same side thereof, and a resilient arm extending from the first fixed arm to the second fixed arm and connected to the second fixed arm; the auxiliary vibrating diaphragm comprises a folding ring with an arc-shaped cross section, and a first connecting part and a second connecting part which respectively extend from two opposite sides of the folding ring, wherein the first connecting part is fixed on one side of the first fixing arm far away from the support framework, and the second connecting part is fixed on one side of the second fixing arm far away from the support framework, so that the folding ring and the elastic arm are oppositely arranged; the support framework is fixed on the second fixing arm.
9. The sounder device according to claim 7, wherein the resilient member is a flexible circuit board.
10. The sounding device as claimed in claim 8, wherein the magnetic circuit system comprises a magnetic yoke, a main magnetic steel fixed to the magnetic yoke, and two secondary magnetic steels spaced apart from each other on opposite sides of the main magnetic steel to form the magnetic gap with the main magnetic steel, and the two secondary magnetic steels are respectively located between the two elastic supporting components.
11. The sound production device as claimed in claim 10, wherein two of the secondary magnetic steels are located on both sides of the long axis of the voice coil, and two of the elastic support members are located on both sides of the short axis of the voice coil.
12. The sounder device according to claim 10, wherein the magnetic circuit system further comprises an upper clamping plate, the upper clamping plate comprises a ring-shaped fixing ring fixed to the frame and two pole pieces extending from the fixing ring to the secondary magnetic steels, and the two pole pieces are respectively stacked on the two secondary magnetic steels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811162942.4A CN109275075B (en) | 2018-09-30 | 2018-09-30 | Sound production device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811162942.4A CN109275075B (en) | 2018-09-30 | 2018-09-30 | Sound production device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109275075A CN109275075A (en) | 2019-01-25 |
| CN109275075B true CN109275075B (en) | 2020-12-22 |
Family
ID=65196032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811162942.4A Active CN109275075B (en) | 2018-09-30 | 2018-09-30 | Sound production device |
Country Status (1)
| Country | Link |
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| CN (1) | CN109275075B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021000156A1 (en) * | 2019-06-30 | 2021-01-07 | 瑞声声学科技(深圳)有限公司 | Sound emission device |
| CN110996226B (en) * | 2019-11-21 | 2021-12-24 | 瑞声科技(新加坡)有限公司 | Sound production device |
| CN211959535U (en) * | 2020-02-24 | 2020-11-17 | 瑞声科技(新加坡)有限公司 | Sound production device |
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|---|---|---|---|---|
| WO2011030968A1 (en) * | 2009-09-11 | 2011-03-17 | 주식회사 비에스이 | Multifunctional micro speaker |
| CN107277706A (en) * | 2017-04-15 | 2017-10-20 | 瑞声科技(新加坡)有限公司 | Loudspeaker |
| CN208924472U (en) * | 2018-09-30 | 2019-05-31 | 瑞声科技(新加坡)有限公司 | Microphone device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02260799A (en) * | 1989-03-30 | 1990-10-23 | Pioneer Electron Corp | Speaker and its manufacture |
| JP4630958B2 (en) * | 2003-02-27 | 2011-02-09 | 並木精密宝石株式会社 | Multifunctional actuator and portable terminal device |
| JPWO2010050068A1 (en) * | 2008-10-31 | 2012-03-29 | パイオニア株式会社 | Speaker device and automobile |
| CN205847556U (en) * | 2016-05-26 | 2016-12-28 | 瑞声科技(新加坡)有限公司 | Speaker |
| CN206024099U (en) * | 2016-08-03 | 2017-03-15 | 万魔声学科技有限公司 | Horn single body |
| CN108322869B (en) * | 2018-01-24 | 2021-01-15 | 瑞声科技(新加坡)有限公司 | Sound production device |
| CN207869350U (en) * | 2018-01-24 | 2018-09-14 | 瑞声科技(新加坡)有限公司 | Mini-sound device |
| CN108495243A (en) * | 2018-04-17 | 2018-09-04 | 青岛海信电器股份有限公司 | A kind of loud speaker and terminal device |
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2018
- 2018-09-30 CN CN201811162942.4A patent/CN109275075B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011030968A1 (en) * | 2009-09-11 | 2011-03-17 | 주식회사 비에스이 | Multifunctional micro speaker |
| CN107277706A (en) * | 2017-04-15 | 2017-10-20 | 瑞声科技(新加坡)有限公司 | Loudspeaker |
| CN208924472U (en) * | 2018-09-30 | 2019-05-31 | 瑞声科技(新加坡)有限公司 | Microphone device |
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| CN109275075A (en) | 2019-01-25 |
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