WO2019015069A1 - 一种扬声器 - Google Patents

一种扬声器 Download PDF

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Publication number
WO2019015069A1
WO2019015069A1 PCT/CN2017/102282 CN2017102282W WO2019015069A1 WO 2019015069 A1 WO2019015069 A1 WO 2019015069A1 CN 2017102282 W CN2017102282 W CN 2017102282W WO 2019015069 A1 WO2019015069 A1 WO 2019015069A1
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Prior art keywords
recessed portion
base
magnet
speaker according
speaker
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PCT/CN2017/102282
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English (en)
French (fr)
Inventor
王建建
刘迎新
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歌尔股份有限公司
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Publication of WO2019015069A1 publication Critical patent/WO2019015069A1/zh

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    • 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
    • H04R9/06—Loudspeakers

Definitions

  • the present invention relates to the field of electroacoustic products, and more particularly to a speaker.
  • a speaker is a device that can convert electrical energy into sound energy. It belongs to the most basic sounding unit.
  • the speaker unit is an important acoustic device of portable electronic devices, and it is widely used in terminal devices such as mobile phones.
  • the speaker unit consists of a vibration system and a magnetic circuit system, which can perform basic electrical energy conversion into sound energy.
  • the speaker includes an outer casing formed with a receiving space and a vibration system and a magnetic circuit system housed in the outer casing.
  • the outer casing of the speaker is provided with an electrical connection for connecting the internal and external circuits of the speaker, and the electrical connector is electrically connected to the voice coil lead and the external circuit, respectively, to turn on the external circuit and the voice coil lead, and the external circuit inputs the electric energy through the voice coil lead.
  • the circle makes the voice coil vibrate in the speaker through the principle of electromagnetic induction, and the voice coil vibration drives the diaphragm to vibrate and sound, thereby converting electric energy into sound energy and realizing the sounding function of the speaker.
  • the structure of the magnetic circuit system provides power to the speaker and plays a key role in the performance of the speaker.
  • a typical magnetic circuit system includes a magnetically permeable plate, a magnet, and a yoke.
  • the drop test of the speaker is a key test to verify the reliability of the speaker.
  • the bond strength and uniformity of the magnet and the yoke directly affect the results of the drop resistance test.
  • the general magnetic circuit system adopts a method in which the magnet and the yoke are planarly bonded. This bonding method causes the magnet and the yoke to bond less, and the uniformity and consistency of the coating are strict.
  • the technical problem to be solved by the present invention is to provide a speaker which can increase the amount of glue deposited by the magnet and the yoke by improving the structure between the magnet and the yoke in the magnetic circuit system, thereby increasing the magnet and the guide.
  • the yoke bond strength and uniformity improve the stability of the drop resistance reliability test.
  • the present invention provides a speaker including a vibration system including a magnetic yoke and a center magnet, and a magnetic circuit system including at least a base disposed in a horizontal direction The center magnet is coupled to an upper surface of the base;
  • the base includes a first recess formed by inward depression of the upper surface of the base in correspondence with the central magnet.
  • a lateral area of the first recessed portion is smaller than a joint surface area of the base portion and the central magnet.
  • the magnetic circuit system further includes:
  • a magnetic gap for accommodating the voice coil is formed between the center magnet and the side magnet.
  • the base further includes a second recess formed by recessing inwardly from the upper surface of the base correspondingly to the side magnet.
  • the speaker further includes a housing having an annular side wall, one end of which is bonded or integrally molded with the annular side wall, and the other end extends away from the inner surface of the annular side wall.
  • the housing includes a hollow mounting portion that is assembled with the magnetic circuit system, the lower surface of the yoke being exposed outside the housing.
  • first recessed portion and the second recessed portion are filled with an adhesive.
  • the shape of the first recessed portion is a circle, a rectangle or a rounded rectangle; and the shape of the second recessed portion is a circle, a rectangle or a rounded rectangle.
  • first recessed portion and the second recessed portion are recessed structures that do not vertically penetrate the upper surface and the lower surface of the base; the first recessed portion and the second recessed portion may both
  • the at least one groove structure is included, and the plurality of groove structures are evenly spaced, or the spacing between the plurality of groove structures is unequal.
  • the lateral widths of the first recessed portion and the second recessed portion are gradually decreased from the open end to the bottom end, or the lateral widths of the open end and the bottom end of the first recessed portion and the second recessed portion equal.
  • the depths of the first recessed portion and the second recessed portion are equal or unequal.
  • the amount of glue deposited by the center magnet (edge magnet) and the yoke is increased. Further, the bonding strength and uniformity of the magnet and the yoke can be increased, and the stability of the drop resistance reliability test can be improved.
  • Figure 1 is a schematic view showing the structure of a speaker of the present invention
  • FIG. 2 is a schematic structural view of a magnetic circuit system of a speaker of the present invention
  • Figure 3 is a cross-sectional view showing a magnetic circuit system of a speaker of the present invention.
  • Fig. 4 is a partially enlarged view showing a portion A in Fig. 3.
  • FIG. 1 is a schematic structural view of a speaker of the present invention
  • FIG. 2 is a schematic structural view of a magnetic circuit system of a speaker of the present invention
  • Fig. 4 shows a partial enlarged view of the portion A of Fig. 3.
  • the speaker of the present invention is also applicable to a speaker unit having no outer casing structure, and the present embodiment is specifically described by taking a structure having a casing.
  • the present invention provides a speaker including a housing 1 including an annular side wall to which a vibration system and a magnetic circuit system are fixed.
  • the vibration system includes a diaphragm 3 and a voice coil 2 coupled under the diaphragm 3, the diaphragm 3 including a diaphragm body and a reinforcing portion 4 coupled to a plane portion of the diaphragm body.
  • the magnetic circuit system comprises a magnetic yoke 7 and a central magnet 6, which together with the housing 1 constitute an outer casing structure of the loudspeaker, the housing 1 comprising a hollowed out assembly with a magnetic circuit system
  • the mounting portion has a lower surface of the yoke 7 exposed outside the casing 1.
  • the yoke 7 includes at least a base portion disposed in a horizontal direction, and the center magnet 6 is coupled to an upper surface of the base portion; the base portion includes a first portion formed inwardly recessed from the upper surface of the base portion corresponding to the center magnet 6 A recess 701.
  • the speaker provided by the present invention increases the amount of glue adhered between the center magnet 6 and the yoke 7 by providing the first recessed portion 701 on the upper surface of the base portion of the yoke yoke, compared with the prior art magnet and
  • the plane bonding mode of the yoke yoke increases the strength and uniformity of the bonding between the center magnet 6 and the yoke 7, and improves the stability of the drop resistance reliability test.
  • the lateral area of the first recess 701 is smaller than the joint area of the base and the center magnet 6.
  • the magnetic circuit system further includes: a central magnetic conductive plate 5 coupled to the central magnet 6; two or four symmetrical portions surrounding the central magnet at the base edge position The side magnet 601; and the side magnetic plates respectively disposed on the symmetrical two or four side magnets 601; a magnetic gap for accommodating the voice coil 2 is formed between the center magnet 6 and the side magnet 601.
  • the base further includes a second recess formed inwardly recessed from the upper surface of the base in correspondence with the side magnet 601.
  • the function of the second recessed portion corresponding to the side magnet 601 is also to increase the amount of glue adhered between the side magnet 601 and the yoke 7, which is relative to the plane bonding method of the magnet and the yoke in the prior art.
  • the strength and uniformity of the bonding of the side magnet and the yoke 7 are increased, and the stability of the drop resistance reliability test is improved.
  • the housing 1 includes an annular side wall, and one end of the side magnetic conductive plate is bonded or integrally molded with the annular side wall, and the other end extends away from the inner surface of the annular side wall.
  • the present invention provides only a preferred embodiment, and the side magnetic conductive plate can also be directly bonded and fixed to the side magnet, which is not limited in the present invention.
  • the first recess 701 may be filled with an adhesive, and the shape of the first recess 701 may be circular. A rectangle or a rounded rectangle.
  • the first recessed portion 701 is a recess structure that does not vertically penetrate the upper surface and the lower surface of the base; the lateral width of the first recessed portion 701 gradually decreases from the open end to the bottom end, or The open end of the first recess is equal to the lateral width of the bottom end.
  • the depths of the first recesses 701 are equal or unequal.
  • the second recess may be filled with an adhesive, and the shape of the second recess may be a circle, a rectangle or a circle. Corner rectangle.
  • the second recessed portion is a recessed structure that does not vertically penetrate the upper surface and the lower surface of the base; it should be noted that the first recessed portion and the second recessed portion may each include only one recessed structure, or
  • the utility model comprises a plurality of groove structures. When the plurality of groove structures are arranged, the plurality of grooves can be evenly distributed (ie, equally spaced), and of course, can also be arranged in unequal spacing, and the specific setting manner is not limited. .
  • the lateral width of the second recess portion gradually decreases from the open end to the bottom end, or the open end of the second recess portion is equal to the lateral width of the bottom end.
  • the depths of the second recesses are equal or unequal. The invention is not limited thereto.

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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

一种扬声器，包括振动***和磁路***，磁路***包括导磁轭（7）和中心磁铁（6），导磁轭（7）至少包括沿水平方向设置的基部，中心磁铁（6）结合于基部的上表面；基部包括与中心磁铁（6）对应结合的由基部上表面向内凹陷形成的第一凹陷部（701）。通过在导磁轭（7）基部的上表面设置第一凹陷部（701），增加了中心磁铁（6）和导磁轭（7）粘接的存胶量，进而能够增加中心磁铁（6）和导磁轭（7）粘接强度和均匀度，提升耐跌落可靠性试验的稳定性。

Description

一种扬声器 技术领域
本发明涉及电声产品技术领域，更具体地，涉及一种扬声器。
背景技术
扬声器是一种能够将电能转化为声能的器件，属于最基本的发声单元，扬声器单体是便携式电子设备的重要声学器件，其广泛应用于手机等终端设备中。扬声器单体由振动***和磁路***组成，能够完成基本的电能转换为声能的功能。
扬声器包括形成有容纳空间的外壳和收容于外壳内的振动***和磁路***。扬声器的外壳上设有用于连接扬声器内外电路的电连接件，电连接件分别与音圈引线和外部电路电连接，从而导通外部电路与音圈引线，外部电路将电能经由音圈引线输入音圈，从而在扬声器内通过电磁感应原理使音圈振动，音圈振动带动振膜振动发声，从而使电能转化为声能，实现扬声器的发声功能。其中磁路***的结构对扬声器提供动力，对扬声器的性能起了关键作用。通常磁路***包括导磁板、磁铁和导磁轭。扬声器的跌落试验是验证扬声器可靠性的关键试验，磁铁和导磁轭的粘接强度和均匀性对于直接影响耐跌落试验的结果。目前一般磁路***采用的方式是磁铁和导磁轭平面粘接，这种粘接方式会导致磁铁和导磁轭粘接存胶量较少，对涂胶均匀性及一致性要求严格。
基于上述存在的问题，需要提供的一种扬声器以解决上述现有技术所存在的缺陷。
发明内容
本发明要解决的技术问题在于提供一种扬声器，通过对磁路***中磁铁和导磁轭之间结构的改进，增加了磁铁和导磁轭粘接的存胶量，进而能够增加磁铁和导磁轭粘接强度和均匀度，提升耐跌落可靠性试验的稳定性。
为解决上述技术问题，本发明提供一种扬声器，所述扬声器包括振动***和磁路***，所述磁路***包括导磁轭和中心磁铁，所述导磁轭至少包括沿水平方向设置的基部，所述中心磁铁结合于所述基部的上表面；
所述基部包括与中心磁铁对应结合的由基部上表面向内凹陷形成的第一凹陷部。
进一步的，所述第一凹陷部的横向面积小于所述基部与中心磁铁的结合面面积。
进一步的，所述磁路***进一步包括：
结合于所述中心磁铁上的中心导磁板；
位于所述基部边缘位置环绕所述中心磁铁的对称的两个或四个边磁铁；及
分别设置在对称的两个或四个边磁铁上的边导磁板；
所述中心磁铁和边磁铁之间形成容纳音圈的磁间隙。
进一步的，所述基部进一步包括与边磁铁对应结合的由基部上表面向内凹陷形成的第二凹陷部。
进一步的，所述扬声器还包括具有环形侧壁的壳体，所述边导磁板一端与环形侧壁粘接固定或一体注塑成型，另一端向远离环形侧壁内表面方向延伸。
进一步的，所述壳体包括与磁路***装配的镂空的安装部，所述导磁轭的下表面裸露于壳体外。
进一步的，所述第一凹陷部和第二凹陷部内均填充有粘接胶。
进一步的，所述第一凹陷部的形状为圆形、矩形或圆角矩形；所述第二凹陷部的形状为圆形、矩形或圆角矩形。
进一步的，所述第一凹陷部和所述第二凹陷部均为不竖向贯通所述基部上表面和下表面的凹槽结构；所述第一凹陷部、所述第二凹陷部均可包括至少一个凹槽结构，多个所述凹槽结构均匀间隔分布，或者，多个所述凹槽结构之间的间距不等。所述第一凹陷部和所述第二凹陷部的横向宽度均自开口端向底端逐渐减小，或者，所述第一凹陷部和所述第二凹陷部的开口端与底端的横向宽度相等。
进一步的，所述第一凹陷部和所述第二凹陷部的深度相等或者不等。
本发明的有益效果如下：
本发明通过以上技术方案，通过在导磁轭基部的上表面设置第一凹陷部(包括同时设置第二凹陷部)，增加了中心磁铁(边磁铁)与导磁轭粘接的存胶量，进而能够增加磁铁和导磁轭粘接强度和均匀度，提升耐跌落可靠性试验的稳定性。
附图说明
下面结合附图对本发明的具体实施方式作进一步详细的说明；
图1示出本发明的一种扬声器的结构示意图；
图2示出本发明的一种扬声器的磁路***结构示意图；
图3示出本发明的一种扬声器的磁路***剖面图；
图4示出图3中A部的局部放大图。
附图标号：1壳体，2音圈，3振膜，4补强部，5中心导磁板，6中心磁铁，601边磁铁，7导磁轭，701第一凹陷部。
具体实施方式
为了更清楚地说明本发明，下面结合优选实施例和附图对本发明做进一步的说明。附图中相似的部件以相同的附图标记进行表示。本领域技术人员应当理解，下面所具体描述的内容是说明性的而非限制性的，不应以此限制本发明的保护范围。
参见图1-图4，图1示出本发明的一种扬声器的结构示意图；图2示出本发明的一种扬声器的磁路***结构示意图；图3示出本发明的一种扬声器的磁路***剖面图；图4示出图3中A部的局部放大图。基于本发明所要解决的技术问题，解决现有技术中磁铁和导磁轭平面粘接会导致磁铁和导磁轭粘接存胶量较少，影响耐跌落试验的稳定性，对涂胶均匀性及一致性要求严格的问题。
本发明的扬声器同样适用于没有外壳结构的扬声器单体，本实施方式以具有外壳壳体的结构为例进行具体阐述。本发明提供一种扬声器，所述扬声器包括壳体1，所述壳体1包括环形侧壁，所述壳体1上固定有振动***和磁路***。所述振动***包括振膜3和结合于振膜3下方的音圈2，所述振膜3包括振膜本体和结合于振膜本体平面部的补强部4。
所述磁路***包括导磁轭7和中心磁铁6，所述导磁轭7与所述壳体1共同构成所述扬声器的外壳结构，所述壳体1包括与磁路***装配的镂空的安装部，所述导磁轭7的下表面裸露于壳体1外。
所述导磁轭7至少包括沿水平方向设置的基部，所述中心磁铁6结合于所述基部的上表面；所述基部包括与中心磁铁6对应结合的由基部上表面向内凹陷形成的第一凹陷部701。本发明所提供的扬声器通过在导磁轭基部的上表面设置第一凹陷部701，增加了中心磁铁6和导磁轭7之间粘接的存胶量，相对于现有技术中的磁铁和导磁轭的平面粘接方式，增加了中心磁铁6和导磁轭7粘接的强度和均匀度，提升了耐跌落可靠性试验的稳定性。
为了适配中心磁铁6，优选地，所述第一凹陷部701的横向面积小于所述基部与中心磁铁6的结合面面积。
作为一种优选地实施方案，所述磁路***进一步包括：结合于所述中心磁铁6上的中心导磁板5；位于所述基部边缘位置环绕所述中心磁铁的对称的两个或四个边磁铁601；及分别设置在对称的两个或四个边磁铁601上的边导磁板；所述中心磁铁6和边磁铁601之间形成容纳音圈2的磁间隙。
作为进一步优选地实施方案，所述基部进一步包括与边磁铁601对应结合的由基部上表面向内凹陷形成的第二凹陷部。对应边磁铁601的第二凹陷部的作用同样是增加了边磁铁601和导磁轭7之间粘接的存胶量，相对于现有技术中的磁铁和导磁轭的平面粘接方式，增加了边磁铁和导磁轭7粘接的强度和均匀度，提升了耐跌落可靠性试验的稳定性。
本发明所述扬声器中，所述壳体1包括环形侧壁，所述边导磁板一端与环形侧壁粘接固定或一体注塑成型，另一端向远离环形侧壁内表面方向延伸。对于该边导磁板的结构及配置方式，本发明仅提供一种优选的实施方式，该边导磁板也可直接结合固定在边磁铁上，本发明对此不作限制。
进一步优选地，为了便于导磁轭7与中心磁铁6之间的结合固定，所述第一凹陷部701内可填充有粘接胶，且所述第一凹陷部701的形状可为圆形、矩形或圆角矩形。所述第一凹陷部701为不竖向贯通所述基部上表面和下表面的凹槽结构；所述第一凹陷部701的横向宽度均自开口端向底端逐渐减小，或者，所述第一凹陷部的开口端与底端的横向宽度相等。所述第一凹陷部701的深度相等或者不等。
进一步优选地，为了便于导磁轭7与边磁铁601之间的结合固定，所述第二凹陷部内可填充有粘接胶，且所述第二凹陷部的形状可为圆形、矩形或圆角矩形。所述第二凹陷部均为不竖向贯通所述基部上表面和下表面的凹槽结构；需要说明的是，第一凹陷部和第二凹陷部均可以只包括一个凹槽结构，也可以包括多个凹槽结构，当设置为多个凹槽结构时，多个凹槽之间可以均匀分布(即等间距设置)，当然也可以设置为不等间距排列，具体的设置方式不受限制。所述第二凹陷部的横向宽度均自开口端向底端逐渐减小，或者，所述第二凹陷部的开口端与底端的横向宽度相等。所述第二凹陷部的深度相等或者不等。本发明对此不作限制。
本文中所采用的描述方位的词语“上”、“下”、“左”、“右”等均是为了说明的方便基于附图中图面所示的方位而言的，在实际装置中这些方位可能由于装置的摆放方式而有所不同。
应当理解，本发明的上述实施例仅仅是为清楚地说明本发明所作的举例，而并非是对本发明的实施方式的限定，对于所属领域的普通技术人员来 说，在上述说明的基础上还可以做出其它不同形式的变化或变动，这里无法对所有的实施方式予以穷举，凡是属于本发明的技术方案所引伸出的显而易见的变化或变动仍处于本发明的保护范围之列。

Claims (10)

  1. 一种扬声器，所述扬声器包括振动***和磁路***，其特征在于，
    所述磁路***包括导磁轭和中心磁铁，所述导磁轭至少包括沿水平方向设置的基部，所述中心磁铁结合于所述基部的上表面；
    所述基部包括与中心磁铁对应结合的由基部上表面向内凹陷形成的第一凹陷部。
  2. 根据权利要求1所述的一种扬声器，其特征在于，
    所述第一凹陷部的横向面积小于所述基部与中心磁铁的结合面面积。
  3. 根据权利要求1所述的一种扬声器，其特征在于，
    所述磁路***进一步包括：
    结合于所述中心磁铁上的中心导磁板；
    位于所述基部边缘位置环绕所述中心磁铁的对称的两个或四个边磁铁；及分别设置在对称的两个或四个边磁铁上的边导磁板；
    所述中心磁铁和边磁铁之间形成容纳音圈的磁间隙。
  4. 根据权利要求3所述的一种扬声器，其特征在于，
    所述基部进一步包括与边磁铁对应结合的由基部上表面向内凹陷形成的第二凹陷部。
  5. 根据权利要求3所述的一种扬声器，其特征在于，
    所述扬声器还包括具有环形侧壁的壳体，所述边导磁板一端与环形侧壁粘接固定或一体注塑成型，另一端向远离环形侧壁内表面方向延伸。
  6. 根据权利要求5所述的一种扬声器，其特征在于，
    所述壳体包括与磁路***装配的镂空的安装部，所述导磁轭的下表面裸露于壳体外。
  7. 根据权利要求4所述的一种扬声器，其特征在于，
    所述第一凹陷部和第二凹陷部内均填充有粘接胶。
  8. 根据权利要求4所述的一种扬声器，其特征在于，
    所述第一凹陷部的形状为圆形、矩形或圆角矩形；
    所述第二凹陷部的形状为圆形、矩形或圆角矩形。
  9. 根据权利要求8所述的一种扬声器，其特征在于，
    所述第一凹陷部和所述第二凹陷部均为不竖向贯通所述基部上表面和下表面的凹槽结构；所述第一凹陷部、所述第二凹陷部均可包括至少一个凹槽结构，多个所述凹槽结构均匀间隔分布，或者，多个所述凹槽结构之间的 间距不等；
    所述第一凹陷部和所述第二凹陷部的横向宽度均自开口端向底端逐渐减小，或者，所述第一凹陷部和所述第二凹陷部的开口端与底端的横向宽度相等。
  10. 根据权利要求8所述的一种扬声器，其特征在于，
    所述第一凹陷部和所述第二凹陷部的深度相等或者不等。
PCT/CN2017/102282 2017-07-18 2017-09-19 一种扬声器 WO2019015069A1 (zh)

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Publication number Priority date Publication date Assignee Title
CN112492460B (zh) * 2020-12-09 2022-03-04 共达电声股份有限公司 扬声器
CN112492462B (zh) * 2020-12-09 2022-03-04 共达电声股份有限公司 一种扬声器
CN112601161B (zh) * 2020-12-09 2021-12-14 共达电声股份有限公司 扬声器

Citations (6)

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US5150419A (en) * 1990-10-06 1992-09-22 Nokia Unterhaltungselektronik Gmbh Calotte-type treble loudspeaker
CN201869357U (zh) * 2010-08-13 2011-06-15 东莞正阳电子有限公司 一种超薄型扬声器***
CN202488675U (zh) * 2011-12-30 2012-10-10 歌尔声学股份有限公司 电声换能器
CN204578770U (zh) * 2015-05-05 2015-08-19 歌尔声学股份有限公司 扬声器
CN205336525U (zh) * 2015-12-30 2016-06-22 歌尔声学股份有限公司 一种扬声器
CN205847587U (zh) * 2016-07-20 2016-12-28 瑞声科技(新加坡)有限公司 扬声器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5150419A (en) * 1990-10-06 1992-09-22 Nokia Unterhaltungselektronik Gmbh Calotte-type treble loudspeaker
CN201869357U (zh) * 2010-08-13 2011-06-15 东莞正阳电子有限公司 一种超薄型扬声器***
CN202488675U (zh) * 2011-12-30 2012-10-10 歌尔声学股份有限公司 电声换能器
CN204578770U (zh) * 2015-05-05 2015-08-19 歌尔声学股份有限公司 扬声器
CN205336525U (zh) * 2015-12-30 2016-06-22 歌尔声学股份有限公司 一种扬声器
CN205847587U (zh) * 2016-07-20 2016-12-28 瑞声科技(新加坡)有限公司 扬声器

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