WO2021253534A1 - Dispositif de production de son - Google Patents

Dispositif de production de son Download PDF

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Publication number
WO2021253534A1
WO2021253534A1 PCT/CN2020/101270 CN2020101270W WO2021253534A1 WO 2021253534 A1 WO2021253534 A1 WO 2021253534A1 CN 2020101270 W CN2020101270 W CN 2020101270W WO 2021253534 A1 WO2021253534 A1 WO 2021253534A1
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WO
WIPO (PCT)
Prior art keywords
voice coil
fixed
magnetic
elastic
groove
Prior art date
Application number
PCT/CN2020/101270
Other languages
English (en)
Chinese (zh)
Inventor
施胜荣
黄金全
石伟杰
陈致远
Original Assignee
瑞声声学科技(深圳)有限公司
瑞声科技(新加坡)有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 瑞声声学科技(深圳)有限公司, 瑞声科技(新加坡)有限公司 filed Critical 瑞声声学科技(深圳)有限公司
Publication of WO2021253534A1 publication Critical patent/WO2021253534A1/fr

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Classifications

    • 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
    • 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
    • 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
    • H04R9/06—Loudspeakers

Definitions

  • the invention relates to the field of electro-acoustic conversion, in particular to a sound-producing device used in portable electronic products.
  • the sound device of the related art includes a basin frame, a vibration system fixed to the basin frame and a magnetic circuit system with a magnetic gap;
  • the vibration system includes a diaphragm fixed to the basin frame, and A voice coil that is inserted into the magnetic gap to drive the diaphragm to vibrate and produce sound;
  • the magnetic circuit system includes a magnetic yoke, a main magnetic steel fixed to the magnetic yoke, and a side magnetic steel that surrounds the main magnetic steel and forms the magnetic gap with the main magnetic steel.
  • the diaphragm and the elastic support assembly are respectively fixed at opposite ends of the voice coil, although the elastic support assembly can effectively prevent the lateral vibration of the voice coil when the voice coil vibrates. Swing, but the elastic support component limits the volume of the side magnets of the magnetic circuit system, and the overall width of the side magnets is relatively narrow, which limits the improvement of the acoustic performance of the sound emitting device; or, the sound emitting device of the related art is designed to Instead of reducing the volume of the side magnets, two parts of the magnets are used to bypass the elastic support components and spliced to form the side magnets. However, in this design, due to the problem of the polarities of the two parts of the magnets, it is difficult to glue together during assembly. The assembly efficiency is low.
  • the purpose of the present invention is to overcome the above technical problems and provide a sound device with good acoustic performance and high assembly efficiency.
  • the present invention provides a sound generating device, which includes a basin frame, a vibration system fixed to the basin frame, and a magnetic circuit system with a magnetic gap; the vibration system includes a vibration system fixed to the basin frame. A diaphragm and a voice coil inserted in the magnetic gap and driving the diaphragm to vibrate and produce sound.
  • the magnetic circuit system includes a yoke, a main magnet fixed to the yoke, and a voice coil surrounding the main magnet and The main magnetic steel is spaced apart to form the first side magnetic steel of the magnetic gap; the sound generating device further includes an elastic member fixed to the basin frame and elastically supporting the voice coil;
  • One side of the first side magnet facing the elastic member is recessed to form a relief groove, and the elastic member is located in the direction of the orthographic projection of the first side magnet along the vibration direction of the diaphragm.
  • the relief groove provides a relief space for the vibration of the elastic member.
  • the elastic member includes a first fixed arm fixed to the basin frame, a second fixed arm fixed to an end of the voice coil away from the diaphragm, and a connection between the first fixed arm and the first fixed arm.
  • the elastic arm of the two fixed arms; the first side magnetic steel includes a first groove wall portion enclosing the relief groove, a second groove wall portion opposite to the first groove wall portion, and connecting the first groove wall portion The groove wall portion and the groove bottom of the second groove wall portion; the first groove wall portion is fixed to the first fixed arm, and the second groove wall portion opposes the main magnetic steel to form the magnetic gap ,
  • the elastic arm is located directly above the bottom of the groove, the orthographic projection of the elastic arm to the bottom of the groove along the vibration direction is completely located in the bottom of the groove, and the relief groove is the vibration of the elastic arm Provide room to make way.
  • the first groove wall portion, the second groove wall portion and the groove bottom are integrally formed.
  • the gap between the elastic arm and the first groove wall portion perpendicular to the vibration direction and the gap between the elastic arm and the second groove wall portion perpendicular to the vibration direction are both not greater than 2 mm .
  • the first side magnets are provided in two and are respectively located on opposite sides of the main magnet, and the elastic members are provided in two and are respectively arranged opposite to the two first side magnets,
  • Each elastic piece includes two second fixing arms, and the second groove wall portion is located between the two second fixing arms of the elastic piece opposite to the second groove wall.
  • the magnetic circuit system further includes two second side magnets respectively arranged on the other opposite sides of the main magnet at intervals, and each of the second side magnets is located between the two elastic members .
  • the voice coil has a rectangular structure with rounded corners
  • the two first side magnets are located on opposite sides of the minor axis of the voice coil
  • the two second side magnets are located on the voice coil.
  • the two elastic members are located on opposite sides of the short axis of the voice coil
  • the second fixed arm is located at the rounded corner of the voice coil.
  • each of the elastic members is further provided with two auxiliary diaphragms, and the two auxiliary diaphragms are respectively located at opposite ends of the first side magnetic steel arranged opposite to the elastic member.
  • the auxiliary diaphragm includes a folded ring portion and two fixed portions extending from opposite sides of the folded ring portion. The two fixed portions are attached to the first fixed arm and the second fixed arm, respectively.
  • the folding ring part is directly opposite to the elastic arm and is arranged at intervals.
  • the magnetic circuit system further includes an upper splint
  • the upper splint includes a ring-shaped fixing ring fixed to the basin frame, and a magnetic steel on the first side and the second side from the fixing ring.
  • Four pole cores extending from the magnetic steel, the four pole cores are respectively stacked on the first side magnetic steel and the second side magnetic steel, and the pole cores are respectively connected to the corresponding first side magnetic
  • the shape of the steel or the second side magnet is matched.
  • the elastic member is a flexible circuit board, and the voice coil is electrically connected to the elastic member.
  • the first side magnet is recessed to form a relief groove on the side close to the diaphragm, and the relief groove is along the length direction of the first side magnet.
  • the elastic arm Extend and make the first fixed wall of the elastic member located between the first side magnet and the diaphragm, and the elastic arm is directed toward the first side magnet along the vibration direction of the diaphragm.
  • the orthographic projection is completely located in the relief slot.
  • the width of the magnetic steel on the first side is effectively increased, the magnetic steel on the first side is maximized, and the sensitivity of the sounding device is increased by 0.3dB, which effectively improves the sounding device’s performance.
  • Acoustic performance, and the first side of the magnetic steel to a certain extent get rid of the space restriction of elastic parts; in addition, because the first side of the magnetic steel is a whole structure instead of splicing, it avoids the influence of repulsive force in splicing and simplifies The assembly process is improved, and the assembly efficiency is improved.
  • Fig. 1 is a schematic diagram of the three-dimensional structure of the sound generating device of the present invention
  • FIG. 2 is an exploded schematic diagram of a part of the three-dimensional structure of the sound generating device of the present invention
  • Figure 3 is a sectional view taken along the line A-A in Figure 1;
  • Figure 4 is an enlarged view of the part shown in Figure 3 B;
  • FIG. 5 is a schematic diagram of the structure of the first side magnet of the sound emitting device of the present invention.
  • FIG. 6 is a schematic diagram of the assembly structure of the elastic member, the skeleton, the voice coil, the first side magnet and the second side magnet of the sound device of the present invention.
  • FIG. 7 is a schematic diagram of FIG. 6 from another perspective.
  • the sound generating device 100 provided by the present invention includes a basin frame 1, a vibration system 2, a magnetic circuit system 3, and an elastic member 4.
  • the basin frame 1 is used to support the vibration system 2 and the magnetic circuit system 3, and the magnetic circuit system 3 has a magnetic gap 30.
  • the vibration system 2 includes a diaphragm 21 fixed to the basin frame 1 and a voice coil 22 inserted in the magnetic gap 30 and driving the diaphragm to vibrate and produce sound.
  • the magnetic circuit system 3 includes a magnetic yoke 31 fixed to the basin frame 1, a main magnetic steel 32 fixed to the magnetic yoke 31, and the main magnetic steel 32 that surrounds the main magnetic steel 32 and is spaced from the main magnetic steel 32 to form the The magnetic steel 33 on the first side of the magnetic gap 30.
  • the side of the first side magnet 33 facing the elastic member 4 is recessed to form a relief groove 330.
  • the relief groove 330 extends along the length direction of the first side magnet 33.
  • the first side magnets 33 are provided in two and are respectively located on opposite sides of the main magnet 32, thereby forming a three-magnetic circuit structure.
  • the magnetic circuit system 3 further includes two second side magnets 34 arranged at intervals on the other opposite sides of the main magnet 32, thereby forming Five magnetic circuit structure.
  • the first side magnet 33 and the second side magnet 34 are spaced apart from the main magnet 32 to jointly enclose the magnetic gap 30, which is easy to understand.
  • the magnetic circuit system 3 further includes an upper splint 35.
  • the upper splint 35 includes a ring-shaped fixing ring 351 fixed to the basin frame 1 and a magnetic steel plate extending from the fixing ring 351 to the first side. 33 and the four pole cores 352 extending from the second side magnet 34, the four pole cores 352 are respectively stacked on the first side magnet 33 and the second side magnet 34, and the The pole core 352 matches the shape of the corresponding first side magnet 33 or the second side magnet 34 respectively.
  • the upper clamping plate 35 is used to conduct magnetism and prevent magnetic leakage, and further improve the driving force of the magnetic circuit system 3.
  • the elastic member 4 is fixed to the basin frame 1 and elastically supports the voice coil 22.
  • the portion of the elastic member 4 that is projected toward the first side magnet 33 along the vibration direction of the diaphragm 21 is located in the relief groove 330, so that the relief groove 330 is the elastic member 4
  • the vibrations provide room for room. This structure does not affect the vibration of the elastic member 4 while using the extra space as much as possible to install the first side magnet 33, which effectively increases the volume of the magnetic circuit system 3 and increases the driving performance.
  • the elastic member 4 includes a first fixed arm 41 fixed to the basin frame 1, a second fixed arm 42 connected to the vibration system 2, and a connection between the first fixed arm 41 and the The elastic arm 43 of the second fixed arm 42.
  • the first side magnet 33 includes a first groove wall portion 331 that encloses the relief groove 330, a second groove wall portion 332 opposite to the first groove wall portion 331, and a connection to the first groove wall 331 and the bottom 333 of the second groove wall 332.
  • the first groove wall portion 331, the second groove wall portion 332, and the groove bottom 333 are integrally formed to improve the structural strength and reduce the assembly process.
  • the first fixed arm 41 is located between the first side magnet 33 and the diaphragm 21, the first groove wall portion 331 is fixed to the first fixed arm 41, and the second groove wall portion 332 forms the magnetic gap 30 opposite to the main magnet 32.
  • the elastic arm 43 is located directly above the bottom of the groove 333, that is, on the side close to the diaphragm 21.
  • the elastic arm 43 is located along the diaphragm 21.
  • the orthographic projection of the vibration direction of ⁇ to the groove bottom 333 is completely located within the scope of the groove bottom 333, that is, the relief groove 330 gives way for the vibration of the elastic arm 43 and provides a vibration space thereof.
  • the gap between the elastic arm 43 and the first groove wall portion 331 perpendicular to the vibration direction and the gap between the elastic arm 43 and the second groove wall portion 332 perpendicular to the vibration direction is not more than 2mm. This structure can increase the volume of the effective magnetic circuit portion of the first side magnet 33 as much as possible, and further improve the driving performance.
  • the above-mentioned design of the first side magnet 33 and the elastic member 4 makes the width of the first side magnet 33 extend from the magnetic gap 30 in the prior art to the elastic arm 43 in the sound emitting device 100 of the present invention.
  • the magnetic gap 30 extends to the basin frame 1, and a vibration space is provided for the elastic arm 43 through the relief groove 330, which avoids mutual interference with the elastic member 4, effectively increases the width of the first side magnet 33, and makes the first side magnet 33
  • the volume of the magnetic steel 33 on one side is maximized, thereby increasing the sensitivity of the sound emitting device 100, which effectively improves the acoustic performance of the sound emitting device 100, and the magnetic steel 33 on the first side gets rid of the space of the elastic member 4 to a certain extent.
  • Restrictions increase the degree of freedom of design; in addition, because the first side magnet 33 is a whole structure instead of multiple magnets splicing, the influence of mutual repulsion of the magnets during splicing is avoided, the assembly process is simplified, and the assembly efficiency is improved. .
  • the width of the first side magnet 33 refers to the size from the side close to the voice coil 22 to the side close to the basin frame 1 along the direction perpendicular to the vibration direction.
  • the two elastic members 4 are set as an example for detailed description:
  • the elastic members 4 are provided in two and are respectively arranged opposite to the two first side magnets 33, and each of the second side magnets 34 is located between the two elastic members 4.
  • Each elastic member 4 includes two second fixing arms 42, and the second groove wall portion 332 of the first side magnet 33 is located on the two second fixing arms of the elastic member 4 opposite to it. Between the arms 42, the unused space of the elastic member 4 is further fully utilized, and the width and volume of the first side magnet 33 are effectively increased.
  • the voice coil 22 has a rectangular structure with rounded corners
  • the two first side magnets 33 are located on opposite sides of the minor axis of the voice coil 22
  • the two first side magnets 33 are located on opposite sides of the minor axis of the voice coil 22.
  • the two-sided magnets 34 are located on opposite sides of the long axis of the voice coil 22
  • the two elastic members 4 are located on opposite sides of the short axis of the voice coil 22.
  • the second fixed arm 42 is located at the rounded corner of the voice coil 22.
  • the first side magnet 33 needs to form a relief groove 330.
  • both sides of the long axis of the voice coil 22 can be fully used to design the structure of the second side magnet 34, thereby further increasing
  • the overall volume of the magnetic circuit system 3 can improve its magnetic field performance and drive force, so as to further improve the sensitivity of the sound generating device 100.
  • the structural design of the first side magnet 33 and the elastic member 4 increases the sensitivity of the sound emitting device 100 by about 0.3 dB.
  • the second side magnet 34 is omitted to form a three-magnetic circuit structure, since the first side magnet 33 is arranged on the minor axis side of the voice coil 22, the above technical effect is also obtained, that is, compared with the prior art As far as the three-magnet steel structure is concerned, the sensitivity of the sound emitting device 100 is increased by about 0.3dB.
  • the elastic member 4 After the elastic member 4 is connected to the vibration system 2 through the second fixed arm 42, it is used to support the vibration system 2 to improve the vibration performance of the vibration system 2, and at the same time, it can also suppress the lateral vibration of the voice coil 22 when it vibrates. Swing, that is, a pendulum perpendicular to the vibration direction, thereby improving the acoustic performance of the sound emitting device 100.
  • the vibration system 2 can be directly connected to the diaphragm 21 or the voice coil 22, or can be connected through other structures.
  • the vibration system 2 is also It includes a skeleton 23 and is connected to the second fixed arm 42 of the elastic member 4 through the skeleton 23.
  • the skeleton 23 includes a skeleton body 231 having a ring shape and a skeleton connecting portion 232 extending outward from the skeleton body 231.
  • the skeleton body 231 is located between the diaphragm 21 and the voice coil 22 and suspends the voice coil 22 below the diaphragm 21.
  • the orthographic projection of the skeleton body 231 along the vibration direction of the diaphragm 21 falls on the voice coil 22.
  • the structural design of the skeleton main body 231 of this structure effectively solves the problem of the overflow of glue affecting the vibration space of the diaphragm 21 when the voice coil 22 is glued to the diaphragm 21, and makes the voice coil 22 more concentrated. Better acoustic performance.
  • the orthographic projection of the skeleton body 231 along the vibration direction of the diaphragm 21 falls on the voice coil 22, and the skeleton body 231 and the voice coil 22 at least partially overlap.
  • the range of the skeleton body 231 is larger than the range of the voice coil 22, that is, it extends beyond the range of the voice coil 22, and it can also be understood that the range of the skeleton body 231 is smaller than the range of the voice coil 22; It can be that the range enclosed by the two is equal.
  • the range of the skeleton body 231 is smaller than the range of the voice coil 22.
  • the frame connecting portion 232 is attached to the outer side of the voice coil 22 and extends in the direction of the elastic member 4, and the frame connecting portion 232 is fixedly connected to the second fixed arm 42.
  • the number of the skeleton connecting portions 232 is correspondingly matched and arranged with the second fixed arm 42, that is, the skeleton connecting portions 232 include four and are respectively located at the four rounded corners of the voice coil 22,
  • the four frame connecting portions 232 are respectively fixedly connected to the four second fixed arms 42.
  • the frame body 231 has a ring shape, including a continuous ring shape, that is, an overall structure; it also includes a discontinuous ring shape, that is, the frame body 231 may be multiple intervals and enclose together.
  • the main purpose is to connect at least the skeleton connecting parts 232 in pairs.
  • the structure of the multiple skeleton connecting parts 232 can also avoid the mutual interference with the magnetic circuit system 3 to a greater extent, that is, the magnetic circuit system 3 can be designed to utilize more space and improve the vibration performance.
  • the frame connecting portion 232 includes a top wall 2321 and a bottom wall 2322 that are opposed to each other, and a side wall 2323 connecting the top wall 2321 and the bottom wall 2322, the top wall 2321 and the bottom wall 2322 2322 are located on different sides of the side wall 2323 respectively.
  • the top wall 2321 is connected to the frame body 231 and simultaneously connected to the side of the voice coil 22 close to the diaphragm 21, the bottom wall 2322 is fixedly connected to the second fixed arm 42, and the side The wall 2323 is connected to the outer surface of the voice coil 22.
  • the elastic member 4 is connected to the vibration system 2 through the framework 23, rather than directly connected to the voice coil 22.
  • the indirect connection structure realizes the connection to the voice coil through the elastic member 4. The effective suppression of the lateral swing of the voice coil 22 improves the reliability and stability of the sound emitting device 100.
  • the elastic member 4 is indirectly connected to the voice coil 22, which releases the structural design of the voice coil 22 and makes The position of the voice coil 22 can float up and down along the vibration direction of the diaphragm 21, and the height of the voice coil 22 is no longer limited by the elastic member 4, so that the overall height of the sound generating device 100 can be designed to be lighter and thinner; According to the structural design of the magnetic circuit system 3, the elastic member 4 is not directly glued to the voice coil 22, and the interference between the magnetic circuit system 3 and the elastic member 4 is more effectively avoided, and the magnetic circuit system 3 can be maximized The structure effectively improves the acoustic performance of the sound emitting device 100.
  • each of the elastic members 4 further includes two auxiliary diaphragms 44.
  • the two auxiliary diaphragms 44 are respectively located at opposite ends of the first side magnetic steel 33 disposed opposite to the elastic member 4.
  • the auxiliary diaphragm 44 includes a folding ring portion 441 and two fixing portions 442a and 442b extending from opposite sides of the folding ring portion 441, and the two fixing portions 442a and 442b are respectively attached to the The first fixed arm 41 and the second fixed arm 42, the folding ring portion 441 and the elastic arm 43 are directly opposite to each other and are arranged at intervals.
  • the elastic member 4 is a flexible circuit board, and the voice coil 22 is electrically connected to the elastic member 4. So far, the elastic member 4 not only improves the vibration performance of the vibration system and suppresses the lateral vibration of the vibration, but also provides an external electrical signal for the voice coil 22. After the lead wire 221 of the voice coil 22 is electrically connected to the elastic member 4, the elastic member 4 4 Connecting to an external power source can effectively avoid the risk of the lead 221 of the voice coil 22 being broken during vibration.
  • the first side magnet is recessed to form a relief groove on the side close to the diaphragm, and the relief groove is along the length direction of the first side magnet.
  • the elastic arm Extend and make the first fixed wall of the elastic member located between the first side magnet and the diaphragm, and the elastic arm is directed toward the first side magnet along the vibration direction of the diaphragm.
  • the orthographic projection is completely located in the relief slot.
  • the width of the magnetic steel on the first side is effectively increased, the magnetic steel on the first side is maximized, and the sensitivity of the sounding device is increased by 0.3dB, which effectively improves the sounding device’s performance.
  • Acoustic performance, and the first side of the magnetic steel to a certain extent get rid of the space restriction of elastic parts; in addition, because the first side of the magnetic steel is a whole structure instead of splicing, it avoids the influence of repulsive force in splicing and simplifies The assembly process is improved, and the assembly efficiency is improved.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

L'invention concerne un dispositif de production de son. Le dispositif de production de son comprend un support de bassin, un système de vibration et un système de circuit magnétique ayant un entrefer magnétique ; le système de vibration comprend une membrane fixée au support de bassin et une bobine mobile qui est insérée dans l'entrefer magnétique et entraîne la membrane pour qu'elle vibre et produise un son ; le système de circuit magnétique comprend une culasse magnétique, un acier magnétique principal et des premiers aciers magnétiques latéraux qui entourent l'acier magnétique principal et forment des entrefers magnétiques avec l'acier magnétique principal. Le dispositif de production sonore comprend en outre des éléments élastiques qui sont fixés au support de bassin et supportent élastiquement la bobine mobile, les côtés des premiers aciers magnétiques latéraux faisant face aux éléments élastiques sont évidés pour former des rainures de décharge, les projections orthographiques des éléments élastiques vers les premiers aciers magnétiques latéraux le long de la direction de vibration de la membrane sont partiellement situées dans les rainures de décharge, et les rainures de décharge fournissent des espaces de décharge pour la vibration des éléments élastiques. Par rapport à l'art apparenté, le dispositif de production sonore de la présente invention présente de bonnes performances acoustiques et une grande efficacité d'assemblage.
PCT/CN2020/101270 2020-06-15 2020-07-10 Dispositif de production de son WO2021253534A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010546683.6A CN111641905A (zh) 2020-06-15 2020-06-15 发声器件
CN202010546683.6 2020-06-15

Publications (1)

Publication Number Publication Date
WO2021253534A1 true WO2021253534A1 (fr) 2021-12-23

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WO (1) WO2021253534A1 (fr)

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CN214177553U (zh) * 2020-11-30 2021-09-10 瑞声科技(新加坡)有限公司 发声器件
CN115914902A (zh) * 2022-12-19 2023-04-04 瑞声科技（南京）有限公司 多功能发声器件

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