WO2020224276A1 - 一种发声装置 - Google Patents

一种发声装置 Download PDF

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Publication number
WO2020224276A1
WO2020224276A1 PCT/CN2019/129014 CN2019129014W WO2020224276A1 WO 2020224276 A1 WO2020224276 A1 WO 2020224276A1 CN 2019129014 W CN2019129014 W CN 2019129014W WO 2020224276 A1 WO2020224276 A1 WO 2020224276A1
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WIPO (PCT)
Prior art keywords
shell
housing
column
reinforcing
sound
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PCT/CN2019/129014
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English (en)
French (fr)
Inventor
曹明君
张福铭
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歌尔股份有限公司
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Application filed by 歌尔股份有限公司 filed Critical 歌尔股份有限公司
Publication of WO2020224276A1 publication Critical patent/WO2020224276A1/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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the invention relates to the technical field of electroacoustic products, in particular to a sound generating device.
  • the shells of speaker modules are mostly injection-molded plastic shells.
  • the shells are often designed to be relatively thick, usually around 0.6 mm. It will cause the cavity space inside the speaker module to be too small and affect the acoustic performance.
  • the main purpose of the present invention is to provide an acoustic device, which aims to solve the problems in the prior art that the module housing cannot be thinned and provide sufficient strength.
  • the present invention provides an acoustic device, which includes an outer casing and a sounding unit.
  • the outer casing includes a first casing and a second casing that are assembled with each other and form a containing cavity.
  • the unit is installed and fixed in the containing cavity, wherein,
  • the first shell and/or the second shell are molded by metal powder injection; the outer shell is also provided with a reinforcing structure.
  • the first shell and the second shell are both formed by metal powder injection molding, and the thickness of the shell walls of the first shell and the second shell is 0.2-0.3 mm, respectively.
  • the reinforcing structure includes reinforcing ribs arranged on the first shell and/or the second shell; and/or arranged between the first shell and the second shell And connect the first shell and the reinforcing column of the second shell.
  • the first shell/the second shell is molded by metal powder injection, and the thickness of the shell wall of the first shell/the second shell is 0.2-0.3 mm.
  • the reinforcing structure includes reinforcing ribs arranged on the first shell/second shell formed by metal powder injection molding; and/or arranged between the first shell and the second shell And connect the first shell and the reinforcing column of the second shell.
  • the reinforcing ribs protrude inward/outward from the surface of the corresponding outer shell wall.
  • the reinforcing ribs are provided with at least one group; any group of the reinforcing ribs includes a plurality of parallel/staggered ribs.
  • the reinforcing column is arranged along the assembling direction of the first shell and the second shell.
  • the reinforcing column includes a first column and a second column that are arranged oppositely on the shell wall surfaces of the first shell and the second shell; the second column includes alternately arranged and formed The column assembly of the clamping space, the first column extends in the direction of the second column and is clamped and fixed in the clamping space of the second column.
  • the sound generating unit divides the cavity enclosed by the outer casing into a front sound cavity and a rear sound cavity, and the reinforcing ribs and/or the reinforcing pillars are arranged on the outer casing corresponding to the rear sound cavity.
  • the inner wall surface of the first housing is provided with multiple sets of the reinforcing ribs protruding and extending in the direction of the second housing; and, between the first housing and the second housing The reinforcing column is arranged between.
  • any group of said reinforcing ribs includes a plurality of first ribs extending along the length/width direction of the shell wall surface of the first shell, and at least one second rib perpendicular to the first rib. Ribs.
  • both the first shell and the second shell are injection molded from stainless steel powder.
  • the first shell is injection molded from stainless steel powder, and the second shell is a plastic shell; or, the second shell is injection molded from stainless steel powder, and the first shell is a plastic shell .
  • it further includes a third shell; the third shell is injection molded by metal powder, or the third shell is a plastic shell.
  • the first shell and/or the second shell are formed by a metal powder injection molding process, and the wall thickness of the outer shell of the sound device can be reduced to 0.2-0.3 mm, which is compared with the existing As far as the plastic casing in the technology is concerned, the assembly will effectively increase the volume of the inner cavity of the sounding device, especially the volume of the rear cavity.
  • the sound pressure level of the sounding device in the low frequency range can be significantly improved, which is also in line with the current consumer electronic terminals The design trend of equipment becoming thinner.
  • the sound generating device of the present invention is further provided with a reinforcement structure on the outer shell.
  • the reinforcement structure can provide sufficient strength for the thinned outer shell, which can effectively improve the resonance of the outer shell and further ensure the acoustic performance.
  • Figure 1 is an exploded view of the structure of an embodiment of the acoustic device of the present invention
  • FIG. 2 is a schematic diagram of the structure of the first housing part of an embodiment of the acoustic device of the present invention
  • FIG. 3 is a schematic cross-sectional view of an embodiment of the acoustic device of the present invention.
  • FIG. 4 is a comparison diagram of sound pressure level curves between an embodiment of the acoustic device of the present invention and a traditional plastic casing;
  • FIG. 5 is a shell resonance deformation cloud diagram of an embodiment of the acoustic device of the present invention and a conventional plastic shell without a reinforcement structure.
  • the present invention provides an acoustic device, which includes an outer casing and a sounding unit.
  • the outer casing includes a first casing and a second casing that are assembled with each other to form a containing cavity, and the sounding unit is installed and fixed in the containing cavity.
  • the first shell and/or the second shell are molded by metal powder injection, and the outer shell is also provided with a reinforcing structure.
  • the sound generating device of this embodiment includes an outer housing 1.
  • the outer housing 1 includes a first housing 11 and a second housing 12 assembled with each other. After the housing 11 and the second housing 12 are fixed, an accommodating cavity with an accommodating space is formed, and the sound generating unit 2 is installed and fixed in the accommodating cavity.
  • the outer casing 1 is also provided with a sound outlet 3, and the sound unit divides the cavity enclosed by the outer casing into a front acoustic cavity and a rear acoustic cavity.
  • the sound unit 2 includes a diaphragm, and the space between the diaphragm, the outer casing 1 and the sound outlet 3 together form a front acoustic cavity.
  • the sound waves generated by the vibration of the diaphragm are radiated to the outside through the sound outlet 3, and the back side of the diaphragm
  • the space between the outer casing 1 and the outer casing 1 forms a back acoustic cavity, which seals the sound waves generated by the vibration of the diaphragm to avoid acoustic short circuit.
  • the basic principle of the operation of the sound device is well known to those skilled in the art, and will not be repeated here.
  • the first shell 11 and the second shell 12 of the sound generating device of this embodiment are both manufactured by a metal powder injection molding process.
  • the metal powder injection molding process is a new type of powder metallurgy near-net forming technology formed by introducing modern plastic injection molding technology into the field of powder metallurgy.
  • the basic process is: first, the solid powder and the organic binder are uniformly mixed. After granulation, it is injected into the mold cavity with an injection molding machine under the heating and plasticizing state ( ⁇ 150°C) to be solidified, and then the binder in the formed blank is removed by chemical or thermal decomposition, and finally sintered to densify Get the final product. That is to say, both the first shell 11 and the second shell 12 are made of metal materials.
  • the thickness of the shell walls of the two shells can be limited in the range of 0.2-0.3 mm, preferably 0.2mm.
  • the sounding device of this embodiment has a thinner shell wall thickness.
  • the technicians compare the sounding device of a traditional plastic shell with a wall thickness of 0.6 mm to the 0.2 mm in this embodiment. Comparing the acoustic performance of the sound generating device with a thick shell wall, it can be found that the sound pressure level performance of the sound generating device of this embodiment in the low frequency band has been significantly improved.
  • the sound pressure level (dB) value of a sound device that uses a metal powder injection molding process to form an outer shell has always been better than that of a plastic shell.
  • the sound pressure level (dB) value of the sounding device In any specific frequency band within this range, the sound pressure level performance of the sound generating device of this embodiment is effectively improved compared with that of the sound generating device of the traditional plastic shell.
  • the sounding device based on this embodiment uses metal materials to form the first shell 11 and the second shell 12 through a metal powder injection molding process. After solving the problem of wall thickness in the prior art, it is also necessary to consider how to provide sufficient strength.
  • a reinforcement structure is also provided on the outer casing 1.
  • the reinforcing structure includes a reinforcing rib 13 provided on the first housing 11, and a reinforcement provided between the first housing 11 and the second housing 12 and connecting the first housing 11 and the second housing 12. column.
  • the design of the reinforcing rib 13 and the reinforcing column can increase the strength of the shell itself and ensure the acoustic performance.
  • FIG. 5 shows a resonance deformation cloud diagram of the housing of the sound generating device of this embodiment and a resonance deformation cloud diagram of a traditional plastic housing, wherein the lighter color area in the cloud diagram is the resonance deformation area.
  • the reinforcing ribs 13 may be a structure that protrudes from the inner wall surface of the first housing 11 and extends toward the second housing 12.
  • any group of reinforcing ribs 13 includes a plurality of first ribs 131 extending along the length/width direction of the shell wall surface of the first shell 11, and at least one second rib 132 perpendicularly intersecting the first rib 131 .
  • the reinforcing ribs 13 can be arranged on the first shell 11, the second shell 12, or two
  • the simultaneous installation on the shell is suitable for the present invention.
  • the ribs 13 can either protrude inward from the wall surface of the corresponding outer casing, or protrude outward from the wall surface of the outer casing, regardless of the direction of the ribs. It can strengthen the shell strength.
  • the number, shape, and design form of the ribs 13 are not limited.
  • each group of reinforcing ribs can include several ribs arranged in parallel, or several staggered ribs.
  • the staggered arrangement here can be as shown in this embodiment. This way of intersecting vertically can also be a way in which multiple ribs are interlaced with each other (not necessarily intersecting vertically).
  • the reinforcing column since the reinforcing column is actually a structure connecting the first shell 11 and the second shell 12, the reinforcing column should be arranged along the assembling direction of the first shell 11 and the second shell 12.
  • the reinforcing column may include a first column 141 and a second column 142 disposed on the wall surfaces of the first shell 11 and the second shell 12 opposite to each other, wherein the second column 142 may include a certain distance
  • the column components are arranged alternately and form a clamping space.
  • the column components are specifically two sections of columns arranged in parallel.
  • the first column 141 extends in the direction of the second column 142 and is clamped and fixed to the second column. In the clamping space of the column 142, that is, the first column 141 can be fixed in the space formed by the two sections of the second column 142 in a nested manner.
  • the design of the above-mentioned stiffener 13 and stiffening column structure benefits from the advantages of the metal powder injection molding process for facilitating the molding of products with complex structures and high precision.
  • the first shell 11 and the second shell 12 can be molded by this process. It is integrally formed and does not need to be separately set up.
  • the reinforcing column is set in a nested and fixed manner, and the setting can be completed without gluing and other processes, realizing the connection and support with the two shells, which is convenient for processing And save the process.
  • the reinforcing column can be realized by combining the columns mentioned above, or it can be realized by a single column, that is, a column can be provided between the first shell 11 and the second shell 12. Then it is connected with the shell walls of the two shells through processes such as gluing, so that the function of strengthening the column can also be realized.
  • multiple first pillars 141 and second pillars 142 may be provided.
  • the pillar components of the second pillars also include multiple pairs forming the aforementioned nest Segmented columns of the structure.
  • the specific shape of the column is not limited by the above embodiment, and can be flexibly adjusted as required.
  • the reinforcement structure may be provided on the outer housing corresponding to the rear acoustic cavity of the sound emitting device, that is, provided on the part of the first housing 11 and/or the second housing 12 constituting the rear acoustic cavity. Further, part of the cavity formed by the first shell 11 and the second shell 12 is used to install and fix the sound generating unit 2, and the strength of the outer shell constituting the other part of the cavity is relatively weak, and the reinforcement structure can be preferentially installed in this part Set on the shell.
  • first shell 11 and the second shell 12 may be injection molded from stainless steel powder, such as 316L, 17-4, 2507, etc. stainless steel powder.
  • stainless steel powder such as 316L, 17-4, 2507, etc. stainless steel powder.
  • this embodiment shows a more preferred design solution.
  • the first shell 11 is formed by this process, the thickness of the shell wall of the first shell 11 is 0.2-0.3 mm (preferably 0.2 mm), and the second shell 12 It can still be a traditional plastic shell, although in comparison, the effect of increasing the volume of the inner cavity is not more significant than in the above-mentioned embodiment, but compared to the design solution of the traditional outer shell adopting the plastic shell , There are still merits.
  • the second shell 12 may be formed by a metal powder injection process, and the first shell is a traditional plastic shell, which will not be described in detail.
  • the first shell is a traditional plastic shell, which will not be described in detail.
  • reinforcement ribs 13 on the shell (first shell 11 or second shell 12) molded by metal powder injection, because the shell wall is thinner, The strength is weak, and the structure needs to be strengthened to meet the product's demand for shell strength.
  • the reinforcing rib 13 may not be provided, and only a reinforcing column structure may be provided between the two shells, or two reinforcing structures may be provided at the same time.
  • the reinforcing ribs can only be provided on the shell molded by the metal powder injection process, because the steel sheet is not easy to form this complex structure. of.
  • the sound generating device of the present invention can also be configured as a three-part housing, that is, it also includes a third housing.
  • the third housing can also be made by a metal powder molding process, and of course it can also be a plastic housing. .

Abstract

本发明提供了一种发声装置，包括外部壳体和发声单元，外部壳体包括相互组配在一起并形成容纳腔的第一壳体和第二壳体，发声单元安装固定在所述容纳腔内，第一壳体和/或第二壳体通过金属粉末注射成型；外部壳体上还设置有加强结构。本发明的技术方案，既可以减薄发声装置外部壳体的厚度，同时可以满足产品对壳体强度的需求，避免壳体产生共振。

Description

一种发声装置 技术领域
本发明涉及电声产品技术领域，特别涉及一种发声装置。
背景技术
现有技术中，扬声器模组的壳体大多是注塑成型的塑胶壳体，而为了支撑塑胶壳体具有足够的强度，壳体往往设计的比较厚，通常在0.6㎜左右，组配在一起后会导致扬声器模组内部的腔体空间过小，影响声学性能。
为了降低壳体特定部分的壁厚，目前常用的设计是采用冲压钢片代替塑胶，钢片相较于塑胶而言对解决壁厚的问题确实有积极的作用，但是另一方面，冲压钢片无法做出加强筋等较复杂的结构，导致整体上强度不足，极易在扬声器箱工作时产生共振现象，从而影响声学性能。
发明内容
本发明的主要目的是提供一种声学装置，旨在解决现有技术中无法兼顾模组壳体减薄及提供足够强度的问题。
为实现上述目的，本发明提出一种声学装置，包括外部壳体和发声单元，所述外部壳体包括相互组配在一起并形成容纳腔的第一壳体和第二壳体，所述发声单元安装固定在所述容纳腔内，其中，
所述第一壳体和/或所述第二壳体通过金属粉末注射成型；所述外部壳体上还设置有加强结构。
优选地，所述第一壳体和所述第二壳体均通过金属粉末注射成型，所述第一壳体和所述第二壳体的壳壁的厚度分别为0.2-0.3㎜。
进一步地，所述加强结构包括设置在所述第一壳体和/或所述第二壳体上的加强筋；和/或设置在所述第一壳体与所述第二壳体之间并且连接所述第一壳体和所述第二壳体的加强柱。
优选地，所述第一壳体/所述第二壳体通过金属粉末注射成型，所述第一 壳体/所述第二壳体的壳壁的厚度为0.2-0.3㎜。
进一步地，所述加强结构包括设置在通过金属粉末注射成型的第一壳体/第二壳体上的加强筋；和/或设置在所述第一壳体与所述第二壳体之间并且连接所述第一壳体和所述第二壳体的加强柱。
优选地，所述加强筋自对应的所述外部壳体的壳壁表面向内侧/外侧凸起。
优选地，所述加强筋设置有至少一组；任意一组所述加强筋包含若干条平行/交错设置的筋条。
优选地，所述加强柱沿所述第一壳体和所述第二壳体的装配方向设置。
优选地，所述加强柱包括在所述第一壳体和所述第二壳体的壳壁表面相对设置的第一柱体和第二柱体；所述第二柱体包括相间设置并且形成夹持空间的柱体组件，所述第一柱体向所述第二柱体方向延伸并且被夹持固定在所述第二柱体的夹持空间内。
优选地，所述发声单元将所述外部壳体围成的腔体分隔为前声腔和后声腔，所述加强筋和/或所述加强柱设置在对应所述后声腔的外部壳体上。
优选地，所述第一壳体的内壁表面设置有多组向所述第二壳体的方向凸起延伸的所述加强筋；并且，所述第一壳体与所述第二壳体之间设置有所述加强柱。
优选地，任意一组所述加强筋包括若干沿所述第一壳体的壳壁表面的长度/宽度方向延伸的第一筋条，以及至少一条与所述第一筋条垂直相交的第二筋条。
优选地，所述第一壳体和所述第二壳体均由不锈钢粉末注射成型。
优选地，所述第一壳体由不锈钢粉末注射成型，所述第二壳体为塑胶壳体；或者，所述第二壳体由不锈钢粉末注射成型，所述第一壳体为塑胶壳体。
优选地，还包括第三壳体；所述第三壳体通过金属粉末注射成型，或者所述第三壳体为塑胶壳体。
本发明技术方案的发声装置，第一壳体和/或第二壳体通过金属粉末注射成型工艺成型，发声装置的外部壳体的壁厚可以减薄到0.2-0.3㎜，相较于现有技术中的塑胶壳体而言，组配后会有效增大发声装置内腔的体积，尤其是后腔体积，发声装置在低频段的声压级表现可以得到明显提升，也符合目前 消费电子终端设备日趋薄型化的设计趋势。
进一步地，本发明的发声装置，在外部壳体上还设置有加强结构，加强结构可以为减薄的外部壳体提供足够的强度，能够有效改善外部壳体产生共振，进一步保证声学性能。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1是本发明声学装置一实施例的结构爆炸图；
图2是本发明声学装置一实施例第一壳体部分的结构示意图；
图3为本发明声学装置一实施例的剖面示意图；
图4为本发明声学装置一实施例与传统塑胶壳体的声压级曲线对比图；
图5为本发明声学装置一实施例与无加强结构的传统塑胶壳体的壳体共振变形云图。
附图标号说明：
1、外部壳体，11、第一壳体，12、第二壳体，13、加强筋，131、第一筋条，132、第二筋条，141、第一柱体，142、第二柱体，2、发声单元，3、出声口。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明，本发明实施例中所有方向性指示(诸如上、下、左、右、前、 后……)仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，在本发明中涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。
本发明提出了一种声学装置，其包括外部壳体和发声单元，外部壳体包括相互组配在一起并形成容纳腔的第一壳体和第二壳体，发声单元安装固定在所述容纳腔内，第一壳体和/或第二壳体通过金属粉末注射成型，外部壳体上还设置有加强结构。下面通过一个具体的实施例来详细阐述本发明。
实施例：
如图1、图2和图3共同所示，本实施方式的发声装置包括外部壳体1，外部壳体1包括相互组配在一起的第一壳体11和第二壳体12，第一壳体11和第二壳体12固定后形成一个具有收容空间的容纳腔，发声单元2即安装固定在该容纳腔内。此外，外部壳体1上还设置有出声口3，发声单元将外部壳体围成的腔体分隔为前声腔和后声腔。具体的，发声单元2包括振膜，振膜、外部壳体1与出声口3之间的空间共同形成前声腔，振膜振动产生的声波通过出声口3向外界辐射，振膜背侧与外部壳体1之间的的空间形成后声腔，后声腔将振膜振动产生的声波封闭，避免声短路。发声装置工作的基本原理为本领域技术人员所公知，在此不再赘述。
为了改善现有技术中传统的塑胶壳体壁厚的问题，本实施方式的发声装置，第一壳体11和第二壳体12均通过金属粉末注射成型工艺制成。金属粉末注射成型工艺是将现代塑料注射成型技术引入粉末冶金领域而形成的一门新型粉末冶金近净形成型技术，其基本的工艺过程是：首先将固体粉末与有机粘结剂均匀混练，经制粒后在加热塑化状态下(～150℃)用注射成形机注入模腔内固化成形，然后用化学或热分解的方法将成形坯中的粘结剂脱除，最后经烧结致密化得到最终产品。也就是说，第一壳体11和第二壳体12均采用金属材料，通过金属粉末成型工艺成型后，两个壳体的壳壁的厚度可以限制在0.2-0.3㎜的范围内，优选为0.2㎜。
与现有技术中的塑胶壳体相比，本实施方式的发声装置具有减薄的壳体壁厚，技术人员通过将0.6㎜壁厚的传统塑胶壳体的发声装置与本实施方式中0.2㎜壳体壁厚的发声装置的声学性能进行仿真对比，可以发现本实施方式的发声装置在低频段的声压级表现得到了明显的提升。
具体如图4所示，在0至接近1000赫兹的低频段范围内，采用通过金属粉末注塑成型工艺成型外部壳体的发声装置，其声压级(dB)值一直优于采用塑胶壳体的发声装置的声压级(dB)值。在该范围内的任意一个特定的频段，本实施方式的发声装置的声压级表现相较于传统塑胶壳体的发声装置均得到了有效的提升。
基于本实施方式的发声装置采用金属材料通过金属粉末注射成型工艺制成第一壳体11和第二壳体12，在解决了现有技术壁厚的问题后，还要同时考虑如何提供足够的强度。本实施方式中，在外部壳体1上还设置有加强结构。
具体地，加强结构包括设置在第一壳体11上的加强筋13，以及设置在第一壳体11和第二壳体12之间并且连接第一壳体11和第二壳体12的加强柱。加强筋13及加强柱的设计可以增大壳体自身的强度，保证声学性能。
图5示出了本实施方式发声装置的壳体共振变形云图以及传统塑胶壳体的共振变形云图，其中，云图中颜色较浅的区域为共振变形区域。技术人员通过模态仿真比较，传统塑胶壳体共振频率出现在4034Hz左右，带有加强柱及加强筋的金属粉末注射成型壳体共振频率出现在7827Hz左右，故本实施方式的外部壳体的共振频率远远大于传统塑胶外壳，能有效避免壳体共振。
具体实施时，如图1、图2所示，加强筋13可以是自第一壳体11内壁表面设置的多组向第二壳体12的方向凸起延伸的结构。其中，任意一组加强筋13包括若干沿第一壳体11的壳壁表面的长度/宽度方向延伸的第一筋条131，以及至少一条与第一筋条131垂直相交的第二筋条132。
当然，本实施例仅仅是示出了其中的一种设计方式，事实上，加强筋13既可以设置在第一壳体11上，也可以设置在第二壳体12上，还可以在两个壳体上同时设置，均适用于本发明。另外，加强筋13既可以是自其对应的外部壳体的壳壁表面向内侧凸起，也可以是自外部壳体的壳壁表面向外侧凸起，不论筋条的凸起方向如何，均能够起到加强壳体强度的作用。再者，加强筋13设置的数量、形状以及设计形式等均不受限制，例如可以仅设置一组，也 可以是如本实施方式示出的多组，可以是长条形、圆角矩形、椭圆形、方形等等几何形状，每一组加强筋可以包含若干条平行设置的筋条，也可以包含若干条交错设置的筋条，这里的交错设置既可以是如本实施方式示出的这种垂直相交的方式，也可以是多个筋条相互交错分布的方式(并不一定必须垂直相交)等。
实施时，由于加强柱实际是连接第一壳体11和第二壳体12的结构，因此加强柱应当沿第一壳体11和第二壳体12的装配方向上设置。具体地，加强柱可以包括在第一壳体11和第二壳体12的壳壁表面相对设置的第一柱体141和第二柱体142，其中，第二柱体142可以包括呈一定距离相间设置并且形成夹持空间的柱体组件，本实施方式中柱体组件具体为两段平行设置的柱体，第一柱体141向第二柱体142方向延伸并且被夹持固定在第二柱体142的夹持空间内，即第一柱体141可以以嵌套的方式被固定在第二柱体142的两段柱体形成的空间内。
上述加强筋13及加强柱结构的设计，得益于金属粉末注射成型工艺具有便于成型结构复杂且精度高的产品的优势，可以在通过该工艺成型第一壳体11和第二壳体12时一体成型出来，不需要单独的去额外设置，而且，加强柱设置为嵌套固定在一起的方式，不需要涂胶等工序即可完成设置，实现与两个壳体的连接和支撑，便于加工且节省工序。
同样地，本实施方式也仅作为一种优选的示例进行示意，并不用于限定本发明。事实上，加强柱既可以是上述的组合柱体的方式去实现，也可以是单一的柱体方式实现，即在第一壳体11和第二壳体12之间设置一个柱体即可，然后通过涂胶等工艺与两个壳体的壳壁连接起来，这样也可以实现加强柱的功能。再者，第一柱体141和第二柱体142均可以设置多个，相应的，当第一柱体设置有多个时，第二柱体的柱体组件也包括多对形成上述嵌套结构的分段柱体。另一方面，柱体设置的具体形状也不受上述实施方式的限制，可以根据需要灵活调整。
优选地，加强结构可以设置在对应发声装置后声腔的外部壳体上，即设置在第一壳体11和/或第二壳体12的构成后声腔的部分。进一步地，第一壳体11与第二壳体12形成的腔体，一部分用于安装固定发声单元2，构成另一部分腔体的外部壳体的强度相对较弱，加强结构可优先在这部分壳体上设置。
可选地，第一壳体11和第二壳体12可以由不锈钢粉末注射成型，例如316L，17-4，2507等的不锈钢粉末。当然，伴随着该工艺的日趋成熟，也不排除可以选用其他的金属粉末注射成型，无论采用何种金属材料，都不用于限定本发明的实施。
需要说明的是，本实施方式示出的是一种比较优选的设计方案，除此之外，也可以仅将第一壳体11或者第二壳体12通过金属粉末注射成型工艺制成(同样可以采用不锈钢粉末或者其他金属粉末)，当第一壳体11通过该工艺成型时，该第一壳体11的壳壁的厚度为0.2-0.3㎜(优选为0.2㎜)，第二壳体12可以仍然是传统的塑胶壳体，虽然相比较而言，对内腔体积增大的效果没有上述实施方式中更显著，但相比于传统的外部壳体均采用塑胶壳体的设计方案而言，仍然有可取之处。同理，也可以是第二壳体12通过金属粉末注射工艺成型，第一壳体采用传统的塑胶壳体，不再详述。而对于上述的这种设计方案而言，最优选的是在通过金属粉末注射成型的壳体(第一壳体11或者第二壳体12)上设置加强筋13，因为其壳壁减薄，强度较弱，更需要加强结构去满足产品对壳体强度的需求。当然也可以不设置加强筋13，仅在两个壳体之间设置加强柱结构，或者同时设置两种加强结构。
另外，如果上面所述的塑胶壳体中为了减薄而部分采用了钢片，那么加强筋就只能设置在通过金属粉末注射工艺成型的壳体上，因为钢片是不易成型这种复杂结构的。
再者，本发明的发声装置还可以设置为三部分壳体，即还包括第三壳体，同理，该第三壳体可以同样通过金属粉末成型工艺制成，当然也可以是塑胶壳体。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是在本发明的发明构思下，利用本发明说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本发明的专利保护范围内。

Claims (15)

  1. 一种发声装置，包括外部壳体和发声单元，所述外部壳体包括相互组配在一起并形成容纳腔的第一壳体和第二壳体，所述发声单元安装固定在所述容纳腔内，其特征在于，
    所述第一壳体和/或所述第二壳体通过金属粉末注射成型；
    所述外部壳体上还设置有加强结构。
  2. 根据权利要求1所述的发声装置，其特征在于，所述第一壳体和所述第二壳体均通过金属粉末注射成型，所述第一壳体和所述第二壳体的壳壁的厚度分别为0.2-0.3㎜。
  3. 根据权利要求2所述的发声装置，其特征在于，所述加强结构包括设置在所述第一壳体和/或所述第二壳体上的加强筋；
    和/或设置在所述第一壳体与所述第二壳体之间并且连接所述第一壳体和所述第二壳体的加强柱。
  4. 根据权利要求1所述的发声装置，其特征在于，所述第一壳体/所述第二壳体通过金属粉末注射成型，所述第一壳体/所述第二壳体的壳壁的厚度为0.2-0.3㎜。
  5. 根据权利要求4所述的发声装置，其特征在于，所述加强结构包括设置在通过金属粉末注射成型的第一壳体/第二壳体上的加强筋；
    和/或设置在所述第一壳体与所述第二壳体之间并且连接所述第一壳体和所述第二壳体的加强柱。
  6. 根据权利3或5所述的发声装置，其特征在于，所述加强筋自对应的所述外部壳体的壳壁表面向内侧/外侧凸起。
  7. 根据权利要求3或5所述的发声装置，其特征在于，所述加强筋设置 有至少一组；任意一组所述加强筋包含若干条平行/交错设置的筋条。
  8. 根据权利要求3或5所述的发声装置，其特征在于，所述加强柱沿所述第一壳体和所述第二壳体的装配方向设置。
  9. 根据权利要求3或5所述的发声装置，其特征在于，所述加强柱包括在所述第一壳体和所述第二壳体的壳壁表面相对设置的第一柱体和第二柱体；所述第二柱体包括相间设置并且形成夹持空间的柱体组件，所述第一柱体向所述第二柱体方向延伸并且被夹持固定在所述第二柱体的夹持空间内。
  10. 根据权利要求3或5所述的发声装置，其特征在于，所述发声单元将所述外部壳体围成的腔体分隔为前声腔和后声腔，所述加强筋和/或所述加强柱设置在对应所述后声腔的外部壳体上。
  11. 根据权利要求3所述的发声装置，其特征在于，所述第一壳体的内壁表面设置有多组向所述第二壳体的方向凸起延伸的所述加强筋；并且，所述第一壳体与所述第二壳体之间设置有所述加强柱。
  12. 根据权利要求11所述的发声装置，其特征在于，任意一组所述加强筋包括若干沿所述第一壳体的壳壁表面的长度/宽度方向延伸的第一筋条，以及至少一条与所述第一筋条垂直相交的第二筋条。
  13. 根据权利要求2所述的发声装置，其特征在于，所述第一壳体和所述第二壳体均由不锈钢粉末注射成型。
  14. 根据权利要求4所述的发声装置，其特征在于，所述第一壳体由不锈钢粉末注射成型，所述第二壳体为塑胶壳体；
    或者，所述第二壳体由不锈钢粉末注射成型，所述第一壳体为塑胶壳体。
  15. 根据权利要求1所述的发声装置，其特征在于，还包括第三壳体； 所述第三壳体通过金属粉末注射成型，或者所述第三壳体为塑胶壳体。
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