WO2021174570A1 - Caisson de haut-parleur - Google Patents

Caisson de haut-parleur Download PDF

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Publication number
WO2021174570A1
WO2021174570A1 PCT/CN2020/078761 CN2020078761W WO2021174570A1 WO 2021174570 A1 WO2021174570 A1 WO 2021174570A1 CN 2020078761 W CN2020078761 W CN 2020078761W WO 2021174570 A1 WO2021174570 A1 WO 2021174570A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
magnetic
voice coil
sound
end cover
Prior art date
Application number
PCT/CN2020/078761
Other languages
English (en)
Chinese (zh)
Inventor
令狐荣林
肖波
章统
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 WO2021174570A1 publication Critical patent/WO2021174570A1/fr

Links

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
    • 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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/127—Non-planar diaphragms or cones dome-shaped
    • 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
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
    • 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
    • H04R9/045—Mounting
    • 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 sound and electricity, in particular to a speaker box used in portable electronic products.
  • the speaker box includes a box body with an accommodating cavity and a sound device arranged in the box body, and a sound hole is penetrated through the box body.
  • the sound emitting device in the related art only has one sound emitting surface, which is not conducive to the improvement of the sensitivity of the speaker box.
  • the object of the present invention is to provide a speaker box, which can increase the effective vibration area, thereby improving the sensitivity of the speaker box.
  • the present invention provides a loudspeaker box, which includes a box body with a containing cavity and a sound emitting device.
  • the partition plate is provided with a monomer leakage hole communicating with the rear cavity
  • the box body is provided with a sound outlet communicating with the front cavity
  • the sound generating device is suspended in the front cavity
  • the sounding device includes a basin frame abutting with the partition, a vibration system fixed on the basin frame, and a magnetic circuit system that drives the vibration system to vibrate and emit sound.
  • the body leakage hole communicates with the leakage hole
  • the vibration system includes an upper diaphragm and a lower diaphragm that are respectively fixed on opposite sides of the basin frame and have opposite vibration directions, an upper voice coil that drives the upper diaphragm to vibrate and produce sound, The lower voice coil that drives the lower diaphragm to vibrate and emit sound, and the frame connecting the lower voice coil and the lower diaphragm, the upper diaphragm, the lower diaphragm and the basin frame are enclosed to form a housing
  • a storage space for a magnetic circuit system comprising a splint fixed on the basin frame and a first magnetic part, a second magnetic part and a first magnetic part fixed on the side of the splint facing the upper diaphragm
  • the second magnetic part is arranged around the first magnetic part and an inner magnetic gap is formed between the two
  • the third magnetic part is arranged around the second magnetic part and an outer magnet is formed between the two
  • the third magnetic part has a leakage
  • the third magnetic part is composed of a plurality of third permanent magnets arranged around the second magnetic part, and two adjacent third permanent magnets are arranged at intervals, wherein two adjacent to the leakage hole The third permanent magnets are arranged at intervals to form the leakage channel.
  • the second magnetic part is a second permanent magnet
  • the second permanent magnet has a continuous ring structure.
  • the frame includes a main body part connected to the lower diaphragm and a plurality of connection parts extending from the main body part to the splint and passing through the escape hole, the connection part and the Lower voice coil connection.
  • the lower voice coil has a rectangular structure with rounded corners, the connecting portions are provided with four, and the four connecting portions are connected to the four rounded corners of the lower voice coil in a one-to-one correspondence.
  • the vibration system further includes an upper dome and a lower dome arranged in the receiving space, and the upper dome is respectively connected to the upper diaphragm and the upper sound at two opposite sides in the vibration direction.
  • the ring is connected, and the opposite sides of the lower dome in the vibration direction are respectively connected with the main body and the lower diaphragm.
  • a first pole core is fixedly arranged on the side of the first magnetic part away from the splint, and a second pole core is fixedly arranged on the side of the second magnetic part away from the splint.
  • a third pole core is fixedly arranged on the side of the three magnetic part away from the clamping plate, and the clamping plate is a clamping plate made of soft magnetic material.
  • the sound emitting device further includes an upper end cover and a lower end cover, the upper diaphragm is sandwiched between the basin frame and the upper end cover, and the upper end cover is provided for the upper diaphragm to emit sound outwards.
  • the lower diaphragm is sandwiched between the basin frame and the lower end cover, and the lower end cover has a second sound hole for the lower diaphragm to emit sound outward.
  • the box body includes an upper bottom surface opposite to the upper end cover and spaced apart, and a lower bottom surface opposite to the lower end cover and spaced apart, and a plurality of second bottom surfaces supporting the upper end cover are provided on the upper bottom surface
  • a cushion block, a plurality of second cushion blocks supporting the lower end cover are arranged on the lower bottom surface.
  • the speaker box of the present invention arranges the upper diaphragm and the lower diaphragm to vibrate in opposite directions and is driven by the upper voice coil and the lower voice coil respectively, and the sound is generated.
  • the device is arranged to be suspended in the front cavity, so that the sound generated by the vibration of the upper diaphragm and the lower diaphragm is transmitted to the outside of the speaker box through the sound outlet, so that the effective vibration area of the speaker box It is greatly improved to improve the sensitivity of the speaker box; at the same time, by setting the magnetic circuit system to have the inner magnetic gap, the outer magnetic gap, the escape hole and the leakage channel, the upper diaphragm and When the lower diaphragm vibrates, the airflow in the accommodation space can circulate with the rear cavity through the leakage hole and the monomer leakage hole.
  • the upper voice coil and the lower voice coil are inserting the upper voice coil and the lower voice coil into the inner magnetic gap and the outer magnetic gap of the magnetic circuit system, respectively, the upper diaphragm and the lower diaphragm share the same
  • the magnetic circuit system improves the utilization rate of the magnetic circuit.
  • Figure 1 is a perspective view of a preferred embodiment of the speaker box of the present invention.
  • Figure 2 is a cross-sectional view of the speaker box shown in Figure 1 along the A-A direction;
  • Figure 3 is a cross-sectional view of the speaker box shown in Figure 1 along the B-B direction;
  • Fig. 4 is a schematic diagram of the structure of the sound emitting device in the speaker box shown in Fig. 2;
  • FIG. 5 is a schematic diagram of the structure of the sound emitting device in the speaker box shown in FIG. 3;
  • Fig. 6 is a three-dimensional exploded view of the sound generating device shown in Fig. 5;
  • FIG. 7 is a schematic structural view of a part of the structure of the vibration system in the sound generating device shown in FIG. 6 after being assembled;
  • FIG. 8 is a schematic structural diagram of part of the structure of the sound generating device shown in FIG. 6 after being assembled;
  • Fig. 9 is a schematic structural diagram of the part of the structure shown in Fig. 8 with the splint removed.
  • the speaker box includes a box body 100 having an accommodating cavity 100A and a sound emitting device 200 arranged in the box body 100.
  • the box body 100 is provided with a partition 101 that divides the containing chamber 100A into a front chamber 100B and a rear chamber 100C, and the partition 101 is provided with a monomer leakage hole 102 that communicates with the rear chamber 100C.
  • the box body 100 is provided with a sound outlet 103 communicating with the front cavity 100B, and the sound emitting device 200 is suspended in the front cavity 100B.
  • the sound generating device 200 includes a basin frame 1 abutting against the partition 101, a vibration system 3 fixed to the basin frame 1, and a magnetic circuit system 5 that drives the vibration system 3 to vibrate and produce sound.
  • the basin frame 1 is provided with a leak hole 1A communicating with the monomer leak hole 102 through it.
  • the magnetic circuit system 5 includes a splint 51 fixed on the basin frame 1 and a first magnetic portion 52, a second magnetic portion 53 and a first magnetic portion 52 fixed on the side of the splint 51 facing the upper diaphragm 31 described later.
  • the third magnetic part 54, the second magnetic part 53 is arranged around the first magnetic part 52 and an inner magnetic gap 5A is formed between the two
  • the third magnetic part 54 is arranged around the second magnetic part 53 and
  • An outer magnetic gap 5B is formed between the two
  • the third magnetic portion 54 has a leakage passage 54A connecting the outer magnetic gap 5B and the leakage hole 1A
  • the clamping plate 51 is at a position facing the outer magnetic gap 5B
  • An escape hole 511 is formed through the upper part, and the escape hole 511 is used to avoid the frame 36 described later.
  • the first magnetic portion 52 is a first permanent magnet. It is understandable that, in other embodiments, the first magnetic portion 52 may also be formed by superimposing two, three, etc., first permanent magnets along the vibration direction X, and there is also a gap between two adjacent first permanent magnets. The pole core can be clamped.
  • the second magnetic portion 53 is a second permanent magnet, and the second permanent magnet has a continuous ring structure. It is understandable that in other embodiments, the second magnetic portion 53 may also be configured to be composed of a plurality of second permanent magnets surrounding the first magnetic portion, and two adjacent second permanent magnets Or, the second magnetic portion 53 may also be formed by superimposing two or three second permanent magnets in a continuous ring structure along the vibration direction X, and two adjacent second permanent magnets A pole core can also be sandwiched between.
  • the third magnetic portion 54 is composed of a plurality of third permanent magnets arranged around the second magnetic portion 53, and two adjacent third permanent magnets are arranged at intervals. Wherein, the two third permanent magnets adjacent to the leakage hole 1A are spaced apart to form the leakage passage 54A. It can be understood that, in other embodiments, the third magnetic portion 54 may also be a second permanent magnet in a ring structure. Accordingly, the position of the second permanent magnet corresponding to the leakage hole needs to be A leakage channel connecting the external magnetic gap and the leakage hole is opened.
  • the first permanent magnet, the second permanent magnet, and the third permanent magnet mentioned above are usually made of magnetic steel. It is understandable that the first permanent magnet, the second permanent magnet, and the third permanent magnet can also be natural magnets.
  • a first pole core 55 is fixed on the side of the first magnetic portion 52 away from the clamping plate 51, and the second magnetic portion 53 is away from the clamping plate 51.
  • a second pole core 56 is fixed on one side, and a third pole core 57 is fixed on the side of the third magnetic portion 54 away from the clamping plate 51.
  • the clamping plate 51 is a clamping plate made of soft magnetic material.
  • the inner magnetic gap 5A and the outer magnetic gap 5B can be effectively increased
  • the magnetic flux inside can improve the acoustic performance of the sound generating device 200, and at the same time, it is also conducive to the light and thin design of the sound generating device 200.
  • first pole core 55, the second pole core 56, and the third pole core 57 are located in the same horizontal plane.
  • the vibration system 3 includes an upper diaphragm 31, a lower diaphragm 33, an upper voice coil 34, a lower voice coil 35, and a frame 36.
  • the upper diaphragm 31 and the lower diaphragm 33 are respectively fixed to the basin frame 1.
  • the vibration directions of the upper diaphragm 31 and the lower diaphragm 33 are opposite, and the upper diaphragm 31, the lower diaphragm 33, and the basin frame 1 are enclosed to form a receiving space 200A,
  • the magnetic circuit system 5 is housed in the accommodating space 200A, the upper voice coil 34 drives the upper diaphragm 31 to vibrate and produce sound, the lower voice coil 35 drives the lower diaphragm 33 to vibrate and produce sound, and the skeleton 36 connects the lower voice coil 35 and the lower diaphragm 33.
  • the upper voice coil 34 is inserted into the inner magnetic gap 5A
  • the lower voice coil 35 is inserted into the outer magnetic gap 5B
  • the avoiding hole 511 of the clamping plate 51 avoids the skeleton 36.
  • the upper voice coil 34 and the lower voice coil 35 are connected to an external power source through a flexible circuit board (not shown). After the upper voice coil 34 is energized, under the magnetic force of the magnetic circuit system 5, The upper diaphragm 31 vibrates along with the upper voice coil 34; after the lower voice coil 35 is energized, under the magnetic force of the magnetic circuit system 5, the lower diaphragm 33 and the skeleton 36 follow the The voice coil 35 will vibrate together.
  • the sound emitting device 200 is arranged to be suspended In the front cavity 100B, the sound generated by the vibration of the upper diaphragm 31 and the lower diaphragm 33 is transmitted to the outside of the speaker box through the sound outlet 103, so that the effective vibration area of the speaker box is greatly increased In order to improve the sensitivity of the speaker box; at the same time, because the magnetic circuit system 5 has the inner magnetic gap 5A, the outer magnetic gap 5B, the escape hole 511 and the leakage channel 54A, the upper diaphragm 31 When the lower diaphragm 33 vibrates, the airflow in the receiving space 200A can circulate with the rear cavity 100C through the leakage hole 1A and the monomer leakage hole 102.
  • the upper voice coil 34 and the lower voice coil 35 are inserted into the inner magnetic gap 5A and the outer magnetic gap 5B of the magnetic circuit system 5, respectively, the upper diaphragm 31 and the The lower diaphragm 33 shares the same magnetic circuit system, which improves the utilization rate of the magnetic circuit.
  • the opposite vibration directions of the upper diaphragm 31 and the lower diaphragm 33 mean that the instantaneous vibration directions are opposite. Specifically, when the upper diaphragm 31 vibrates in a direction away from the magnetic circuit system 5, the lower diaphragm 33 also vibrates in a direction away from the magnetic circuit system 5; the upper diaphragm 31 vibrates in a direction closer to the magnetic circuit system 5. When the circuit system 5 vibrates, the lower diaphragm 33 also vibrates in a direction close to the magnetic circuit system 5.
  • the frame 36 includes a main body portion 361 connected to the lower diaphragm 33 and a plurality of connecting portions 363 extending from the main body portion 361 toward the splint 51 and passing through the escape holes 511.
  • the connection The part 363 is connected to the lower voice coil 35.
  • the structure of the frame 36 with multiple connecting portions 363 can avoid the splint 51 to a greater extent, so that the splint 51 can be designed to utilize more sufficient magnetic permeability to increase the outer magnetic gap 5B. The magnetic flux, thereby improving the vibration performance of the lower diaphragm 33.
  • the main body portion 361 has a flat plate shape.
  • the flat main body 361 can strengthen the connection strength between the frame 36 and the lower diaphragm 33. It can be understood that the implementation of the main body portion 361 is not limited to this; for example, in other embodiments, the main body portion 361 may also be arranged in a continuous ring structure.
  • the upper voice coil 34 and the lower voice coil 35 have a rounded rectangular structure
  • the connecting portions 363 are provided with four, and the four connecting portions 363 correspond to each other one to one.
  • the flexible circuit board is electrically welded to the rounded positions of the upper voice coil 34 and the lower voice coil 35 respectively.
  • the vibration system 3 further includes an upper dome 37 and a lower dome 38 arranged in the receiving space 200A, and the upper dome 37 is opposite to each other on opposite sides of the vibration direction X.
  • the upper diaphragm 31 is connected to the upper voice coil 34
  • the lower dome 38 is connected to the main body 361 and the lower diaphragm 33 on opposite sides along the vibration direction X, respectively.
  • the upper dome 37 and the lower dome 38 may also be arranged outside the receiving space 200A, and the upper diaphragm 31 is opposite to each other in the vibration direction X.
  • the sides are respectively connected to the upper voice coil 34 and the upper dome 37, and the lower diaphragm 33 is respectively connected to the lower dome 38 and the main body 361 along the opposite sides of the vibration direction X.
  • the sound emitting device 200 further includes an upper end cover 7 and a lower end cover 9, and the upper diaphragm 31 is sandwiched between the basin frame 1 and the upper end cover 7.
  • the upper end cover 7 has a first sounding hole 71 for the upper diaphragm 31 to emit sound outward
  • the lower diaphragm 33 is sandwiched between the basin frame 1 and the lower end cover 9, and the lower end
  • the cover 9 has a second sound hole 91 for the lower diaphragm 33 to sound outward.
  • the arrangement of the upper end cover 7 and the lower end cover 9 can better fix the upper diaphragm 31 and the lower diaphragm 33 on the basin frame 1.
  • the box body 100 includes an upper bottom surface 104 opposite to the upper end cover 7 and spaced apart, and a lower bottom surface 105 opposite to the lower end cover 9 and spaced apart.
  • the upper bottom surface 104 is provided with A plurality of first cushion blocks 106 supporting the upper end cover 7, and a plurality of second cushion blocks 107 supporting the lower end cover 9 are provided on the lower bottom surface 105.
  • the sound generating device 200 is suspended in the front cavity 100B through the supporting action of the plurality of first pad blocks 106 and the plurality of second pad blocks 107.
  • the first spacer block 106 and the second spacer block 107 are integrally formed with the box body 100. It is understood that, in other embodiments, the first spacer block 106 may also It is a cushion block fixed on the upper bottom surface 104, and the second cushion block 107 may also be a cushion block fixed on the lower bottom surface 105.
  • the speaker box of the present invention is provided by setting the upper diaphragm 31 and the lower diaphragm 33 to have opposite vibration directions and are driven by the upper voice coil 34 and the lower voice coil 35, respectively, and
  • the sound device 200 is arranged to be suspended in the front cavity 100B, so that the sound generated by the vibration of the upper diaphragm 31 and the lower diaphragm 33 is transmitted to the outside of the speaker box through the sound outlet 103 , So that the effective vibration area of the speaker box is greatly increased to improve the sensitivity of the speaker box;
  • the magnetic circuit system 5 is configured to have the inner magnetic gap 5A, the outer magnetic gap 5B, and the escape hole 511 And the leakage passage 54A, so that when the upper diaphragm 31 and the lower diaphragm 33 vibrate, the airflow in the accommodation space 200A can pass through the leakage hole 1A and the monomer leakage hole 102 and the The back cavity 100C circulates.
  • the upper diaphragm 31 and The lower diaphragm 33 shares the magnetic circuit system 5, thereby improving the utilization of the magnetic circuit.

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

Abstract

La présente invention concerne un caisson de haut-parleur capable d'augmenter une zone de vibration efficace. Le caisson de haut-parleur comprend un corps de caisson ayant une cavité de logement et un dispositif de production de son ; la cavité de logement est divisée en une cavité avant et une cavité arrière au moyen d'une plaque de séparation, et un seul trou de fuite en communication avec la cavité arrière est prévu sur la plaque de séparation ; un trou de sortie de son en communication avec la cavité avant est prévu sur le corps de boîte d'une manière pénétrante ; le dispositif de production de son est suspendu à l'intérieur de la cavité avant, et le dispositif de production de son comprend un panier, un système de vibration et un système de circuit magnétique ; un trou de fuite en communication avec le trou de fuite unique est prévu sur le panier ; le système de vibration comprend le panier, une membrane de vibration supérieure et une membrane de vibration inférieure qui sont opposées dans les directions de vibration, une bobine mobile supérieure, une bobine mobile inférieure et un cadre reliant la bobine mobile inférieure et la membrane de vibration inférieure ; le système de circuit magnétique comprend une plaque de serrage, une première partie magnétique, une deuxième partie magnétique formant un entrefer magnétique interne avec la première partie magnétique, et une troisième partie magnétique formant un entrefer magnétique externe avec la deuxième partie magnétique, et la troisième partie magnétique est munie d'un canal de fuite en communication avec l'entrefer magnétique externe et le trou de fuite ; la bobine mobile supérieure est insérée dans l'entrefer magnétique interne, et la bobine mobile inférieure est insérée dans l'entrefer magnétique externe ; et des trous d'évitement pour éviter le cadre sont prévus sur la plaque de serrage.
PCT/CN2020/078761 2020-03-05 2020-03-11 Caisson de haut-parleur WO2021174570A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010148072.6 2020-03-05
CN202010148072.6A CN111343542B (zh) 2020-03-05 2020-03-05 扬声器箱

Publications (1)

Publication Number Publication Date
WO2021174570A1 true WO2021174570A1 (fr) 2021-09-10

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Application Number Title Priority Date Filing Date
PCT/CN2020/078761 WO2021174570A1 (fr) 2020-03-05 2020-03-11 Caisson de haut-parleur

Country Status (2)

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CN (1) CN111343542B (fr)
WO (1) WO2021174570A1 (fr)

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WO2024036692A1 (fr) * 2022-08-15 2024-02-22 瑞声科技(新加坡)有限公司 Caisson de haut-parleur
WO2024087296A1 (fr) * 2022-10-28 2024-05-02 瑞声光电科技(常州)有限公司 Dispositif de production sonore multifonctionnel

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CN113099365A (zh) * 2021-04-01 2021-07-09 歌尔股份有限公司 发声装置和电子设备
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CN116033318B (zh) * 2021-10-27 2023-12-08 华为终端有限公司 扬声器及电子设备
CN114866913A (zh) * 2022-04-02 2022-08-05 歌尔股份有限公司 发声模组和终端设备
CN114866923A (zh) * 2022-05-07 2022-08-05 歌尔股份有限公司 发声装置和电子终端
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CN206640782U (zh) * 2017-02-17 2017-11-14 万魔声学科技有限公司 音频喇叭和耳机
US10469951B2 (en) * 2017-04-07 2019-11-05 Correlated Magnetics Research, Llc Loudspeaker magnet and earphone assembly

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Publication number Priority date Publication date Assignee Title
WO2024036692A1 (fr) * 2022-08-15 2024-02-22 瑞声科技(新加坡)有限公司 Caisson de haut-parleur
WO2024087296A1 (fr) * 2022-10-28 2024-05-02 瑞声光电科技(常州)有限公司 Dispositif de production sonore multifonctionnel

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