WO2020258798A1 - 发声装置和电子设备 - Google Patents

发声装置和电子设备 Download PDF

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Publication number
WO2020258798A1
WO2020258798A1 PCT/CN2019/128553 CN2019128553W WO2020258798A1 WO 2020258798 A1 WO2020258798 A1 WO 2020258798A1 CN 2019128553 W CN2019128553 W CN 2019128553W WO 2020258798 A1 WO2020258798 A1 WO 2020258798A1
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WIPO (PCT)
Prior art keywords
diaphragm
housing
front cover
ring
sound
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Ceased
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PCT/CN2019/128553
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English (en)
French (fr)
Inventor
刘华伟
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Goertek Inc
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Goertek Inc
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Publication date
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Publication of WO2020258798A1 publication Critical patent/WO2020258798A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the present invention relates to the technical field of sound energy conversion, in particular to a sound generating device and electronic equipment.
  • the waterproof speaker unit is mainly guaranteed by gluing. Since the gluing is subject to process restrictions, there will be differences in stability. Especially for speakers used in deep waterproofing, such methods may have a risk of failure.
  • the main purpose of the present invention is to provide a sounding device, which aims to improve the sealing performance of the sounding device.
  • the sound generating device provided by the present invention includes:
  • the front cover is fixed to the housing
  • the diaphragm is clamped between the front cover and the housing, the diaphragm is provided with an annular sealing protrusion, and the annular sealing protrusion is in sealing contact with the housing or the front cover.
  • both the surface of the diaphragm facing the front cover and the surface of the diaphragm facing the housing are provided with the annular sealing protrusion.
  • the width of the annular sealing protrusion gradually decreases along its protrusion direction.
  • a metal ring is provided on the diaphragm and close to its outer periphery, and the metal ring extends along the circumferential direction of the diaphragm.
  • the metal ring is embedded in the diaphragm.
  • the metal ring is wrapped in the diaphragm, and the metal ring and the diaphragm are integrally injection molded.
  • the outer periphery of the front cover is provided with a ring of sealing skirt, the sealing skirt protrudes toward the direction of the housing, and abuts against the surface of the housing facing the front cover, the The sealing skirt is in sealing contact with the peripheral side of the diaphragm.
  • the shell is injection molded by metal powder.
  • the front cover is injection molded by metal powder.
  • the housing and the front cover are welded and fixed.
  • a sealing ring is sleeved on the outer peripheral surface of the housing to be hermetically connected with the whole machine.
  • the outer peripheral surface of the housing is provided with a ring of installation grooves, and the sealing ring is embedded in the installation groove.
  • the present invention also provides an electronic device, which includes:
  • a sound emitting device the sound emitting device is accommodated in the casing, and the outer shell of the sound emitting device is in sealing contact with the casing, and the sound emitting device includes:
  • the front cover is fixed to the housing
  • the diaphragm is clamped between the front cover and the housing, the diaphragm is provided with an annular sealing protrusion, and the annular sealing protrusion is in sealing contact with the housing or the front cover.
  • the ring-shaped sealing protrusion can seal and abut the housing or the front cover, and the elastic deformation space is larger, so even if the surface between the housing and the front cover is insufficient Flat, the annular sealing protrusion can also adapt to the gap between the housing and the front cover through deformation, so as to achieve waterproofing.
  • Fig. 1 is a schematic structural diagram of an embodiment of a sound generating device of the present invention
  • Figure 2 is an exploded schematic diagram of the sound generating device in Figure 1;
  • Fig. 3 is a schematic plan view of the sound generating device in Fig. 1;
  • Figure 4 is a schematic cross-sectional view of the diaphragm along A-A in Figure 3;
  • Fig. 5 is a cut-away schematic view of the sounding device in Fig. 3 along A-A;
  • Fig. 6 is a schematic structural view of the front cover in Fig. 2 viewed from another angle.
  • the directional indication is only used to explain that it is in a specific posture (as shown in the drawings). If the specific posture changes, the relative positional relationship, movement, etc. of the components below will also change the directional indication accordingly.
  • the present invention provides a sound emitting device, which can be a speaker unit, a speaker module, or a terminal electronic device such as a mobile phone, a stereo, and so on.
  • the sound generating device includes a housing 10, a vibration system, and a magnetic circuit system.
  • the housing 10 is provided with open ends at both ends, that is, the opposite ends are through.
  • the vibration system is housed in the housing 10, and the vibration system includes a diaphragm 30 and a voice coil connected to each other, and the voice coil is fixed on one side of the diaphragm 30.
  • the diaphragm 30 includes a central part, a folding ring part arranged around the central part, and a fixing part arranged around the folding ring part.
  • the diaphragm 30 may also include a composite layer bonded to the central part.
  • the magnetic circuit system includes a magnetic yoke on which an inner magnetic circuit and an outer magnetic circuit are arranged, and a magnetic gap for accommodating the voice coil is formed between the inner magnetic circuit and the outer magnetic circuit.
  • the sound generating device further includes a front cover 20, and the front cover 20 is fixed to the housing 10.
  • the front cover 20 is an annular structure with an opening in the middle, so that the sound generated by the vibration system can come out of the opening of the front cover 20.
  • the diaphragm 30 is clamped between the front cover 20 and the housing 10, the diaphragm 30 is provided with an annular sealing protrusion 31, and the annular sealing protrusion 31 is connected to the housing 10 or the housing 10 or the housing 10.
  • the front cover 20 is sealed and abutted. Specifically, the fixed portion of the diaphragm 30 is clamped between the front cover 20 and the housing 10, and the annular sealing protrusion 31 is located at the fixed portion and extends along the circumferential direction of the diaphragm 30.
  • the surface of the diaphragm 30 facing the front cover 20 and the surface of the diaphragm 30 facing the housing 10 are both provided with the annular sealing protrusion 31, and the surface of the diaphragm 30
  • the annular sealing protrusion 31 facing the surface of the front cover 20 sealingly abuts against the front cover 20, and the annular sealing protrusion 31 facing the surface of the diaphragm 30 sealingly contacts the housing 10, After the front cover 20, the housing 10, and the diaphragm 30 are assembled, the annular sealing protrusion 31 on the edge of the diaphragm 30 is compressed to play a sealing role and realize waterproofing.
  • the annular sealing protrusion 31 may be provided only on the surface of the diaphragm 30 facing the front cover 20, or only on the surface of the diaphragm 30 facing the housing 10 The annular sealing protrusion 31 is provided.
  • the diaphragm 30 is usually made of an elastic material, such as rubber or silica gel, for example, the diaphragm 30.
  • an elastic material such as rubber or silica gel
  • PI polyimide
  • PU polyurethane
  • PET polyethylene terephthalate
  • This type of material is an elastic soft part, so the formed ring-shaped sealing protrusion 31 can achieve Sealing effect.
  • the ring-shaped sealing protrusion 31 can be in sealing contact with the housing 10 or the front cover 20, and the elastic deformation space is larger, so even if the housing 10 and the front cover
  • the surface between the covers 20 is not flat enough, and the annular sealing protrusion 31 can also adapt to the gap between the housing 10 and the front cover 20 through deformation to achieve waterproofing.
  • the surface of the diaphragm 30 facing the front cover 20 and the surface of the diaphragm 30 facing the housing 10 are both provided with a plurality of the annular sealing protrusions 31.
  • the width of the annular sealing protrusion 31 gradually decreases along its protrusion direction, for example, the cross section of the annular sealing protrusion 31 (the cross section is perpendicular to the extending direction of the annular sealing protrusion 31 ) Is semicircular, triangular or trapezoidal, etc.
  • the width in this embodiment refers to the extending direction of the annular sealing protrusion 31 and parallel to the diaphragm surface of the diaphragm 30.
  • a metal ring 40 is provided on the diaphragm 30 and close to its outer periphery, that is, a metal ring 40 is provided on the fixed portion, and the metal ring 40 is arranged along the diaphragm 30.
  • the circumferential direction of the diaphragm 30 extends, so that the periphery of the diaphragm 30 is supported by the metal ring 40, and the strength around the diaphragm 30 increases, which can keep the diaphragm 30 unfolded and achieve better assembly.
  • the metal ring 40 is embedded in the diaphragm 30.
  • the metal ring 40 is wrapped in the diaphragm 30.
  • the thickness of the fixing portion of the diaphragm 30 is set to be larger.
  • a circle of grooves can also be processed in the fixed part of the diaphragm 30.
  • the diaphragm 30 is bent to form a circle of grooves, and the metal ring 40 is embedded in the groove.
  • the metal ring 40 and the diaphragm 30 are integrally injection molded, so that mass production can be realized and the metal ring 40 and the diaphragm 30 are prevented from being separated.
  • the metal ring 40 and the diaphragm 30 can also be fixed by bonding.
  • the orthographic projection of the annular sealing protrusion 31 on the plane of the metal ring 40 is located in the metal ring 40, which is equivalent to arranging the annular sealing protrusion 31 at a position where the strength of the diaphragm 30 is greater, so that it can maintain
  • the shape of the annular sealing protrusion 31 prevents wrinkles at its location from shifting the position and misalignment with the contact surface of the front cover 20 and the housing 10.
  • the casing 10 is molded by metal powder injection (MIM molding).
  • MIM molding metal powder injection
  • the metal powder injection molding process is to introduce modern plastic injection molding technology into powder.
  • a new type of powder metallurgy near-net formation technology formed in the field of metallurgy, its basic process is: firstly mix solid powder and organic binder uniformly, after granulating, use an injection molding machine under heating and plasticizing state It is injected into the mold cavity to solidify and form, then the binder in the formed blank is removed by chemical or thermal decomposition, and finally the final product is obtained by sintering and densification.
  • the housing 10 can 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.
  • the thickness of the shell wall of the housing 10 can be limited to a small range, which is beneficial to reduce the volume of the whole machine, and at the same time, can ensure that the strength of the housing 10 is relatively large.
  • the sound generating device of this embodiment has a thinner wall thickness of the casing 10. The technician compares the sound generating device of the traditional plastic casing with a wall thickness of 0.6 mm to 0.2 in this embodiment. Comparing the acoustic performance of the sound generating device with the wall thickness of the shell 10 mm thick, 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 front cover 20 is formed by metal powder injection molding.
  • the molding method please refer to the molding method of the housing 10, and the material of the front cover 20 may also be stainless steel or the like.
  • the front cover 20 adopts metal powder injection molding, which can meet the complex shape of the front cover 20 and realize mass production.
  • the strength of the front cover 20 is higher, which better forms the protective housing 10 of the vibration system.
  • the front cover 20 and the housing 10 are welded and fixed. Specifically, the peripheral edges of the front cover 20 and the housing 10 are fixed by laser welding.
  • the annular sealing protrusion 31 on the edge of the diaphragm 30 is compressed, which acts as a seal and realizes waterproofing; in addition, the peripheral edges of the front cover 20 and the housing 10 are laser welded Fixed, this way has good sealing effect and high bonding strength after edge welding.
  • the outer periphery of the front cover 20 is provided with a ring of sealing skirt 21, the sealing skirt 21 protrudes toward the direction of the housing 10, and abut against On the surface of the housing 10 facing the front cover 20, the sealing skirt 21 is in sealing contact with the peripheral side of the diaphragm 30.
  • the sealing skirt 21 is formed on the front cover 20 to abut the peripheral side of the diaphragm 30, it is equivalent to accommodating the entire diaphragm 30 in the front cover 20 to restrict the lateral movement of the diaphragm 30; and avoid The diaphragm 30 is exposed.
  • the outer peripheral surface of the sealing skirt 21 is flush with the outer peripheral surface of the housing 10.
  • a sealing ring 50 is sleeved on the outer peripheral surface of the housing 10 to be connected to the whole machine in a sealed manner.
  • the outer peripheral surface of the housing 10 is provided with a ring of mounting grooves 11 extending in the circumferential direction of the housing 10 to form an annular shape, and the sealing ring 50 is embedded in the mounting groove 11.
  • the sealing ring 50 can be prevented from moving up and down and laterally, and the sealing ring 50 can be restricted.
  • the sealing ring 50 is clamped into the installation groove 11, the contact area with the housing 10 is larger, and the sealing effect is better.
  • the sealing ring 50 can also be directly sleeved on the outer periphery of the housing 10.
  • the present invention also provides an electronic device that includes a housing (not shown in the figure) and a sounding device.
  • a housing not shown in the figure
  • a sounding device for the specific structure of the sounding device, please refer to the above-mentioned embodiment, and since the electronic device of the embodiment of the invention adopts the above-mentioned embodiment Therefore, the sound generating device in the above-mentioned embodiment has all the effects, and will not be repeated here.
  • the sound emitting device is installed in the housing, and the housing 10 is in sealing contact with the housing.
  • the sealing ring 50 on the housing 10 is in sealing contact with the inner peripheral wall of the housing to prevent water from flowing into the rear side of the housing 10 from the sound hole opened in the housing.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

本发明公开一种发声装置和电子设备，其中，发声装置包括：外壳；前盖，与所述外壳固定；以及振膜，夹持于所述前盖和所述外壳之间，所述振膜上设有环状密封凸起，所述环状密封凸起与所述外壳或所述前盖密封抵接。本发明技术方案能够提高发声装置的密封性。

Description

发声装置和电子设备 技术领域
本发明涉及声能转换技术领域，特别涉及一种发声装置和电子设备。
背景技术
防水扬声器单体在防水实现上主要通过涂胶保证，由于涂胶受工艺限制较大，在稳定性上会有差异，特别是对于深度防水中应用的扬声器，此类方式可能存在失效风险。
发明内容
本发明的主要目的是提出一种发声装置，旨在提高发声装置的密封性。
为实现上述目的，本发明提出的发声装置，包括：
外壳；
前盖，与所述外壳固定；以及
振膜，夹持于所述前盖和所述外壳之间，所述振膜上设有环状密封凸起，所述环状密封凸起与所述外壳或所述前盖密封抵接。
可选地，所述振膜的朝向所述前盖的表面、以及所述振膜的朝向所述外壳的表面均设有所述环状密封凸起。
可选地，所述环状密封凸起的宽度在沿其凸起方向上逐渐减小。
可选地，所述振膜上且靠近其外周缘设有金属环，所述金属环沿所述振膜的周向延伸。
可选地，所述金属环嵌设于所述振膜内。
可选地，所述金属环包裹在所述振膜内，所述金属环与所述振膜一体注塑成型。
可选地，所述前盖的外周缘设有一圈密封裙边，所述密封裙边朝所述外壳的方向凸出，并抵接在所述外壳的朝向所述前盖的表面，所述密封裙边与所述振膜的周侧密封抵接。
可选地，所述外壳通过金属粉末注射成型。
可选地，所述前盖通过金属粉末注射成型。
可选地，所述外壳和所述前盖焊接固定。
可选地，所述外壳的外周面套设有密封圈而与整机密封连接。
可选地，所述外壳的外周面设有一圈安装槽，所述密封圈嵌设于所述安装槽内。
本发明还提出一种电子设备，所述电子设备包括：
壳体；以及
发声装置，所述发声装置容置于所述壳体内，且所述发声装置的外壳与所述壳体密封抵接，所述发声装置包括：
外壳；
前盖，与所述外壳固定；以及
振膜，夹持于所述前盖和所述外壳之间，所述振膜上设有环状密封凸起，所述环状密封凸起与所述外壳或所述前盖密封抵接。
本发明实施例中，通过在振膜上设置环状密封凸起，环状密封凸起能够与外壳或前盖密封抵接，弹性变形空间更大，故即使外壳和前盖之间的表面不够平整，环状密封凸起通过变形也能够适应外壳和前盖之间的缝隙，实现防水。
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为本发明发声装置一实施例的结构示意图；
图2为图1中发声装置的分解示意图；
图3为图1中发声装置的平面示意图；
图4为图3中振膜沿A-A处的剖切示意图；
图5为图3中发声装置沿A-A处的剖切示意图；
图6为图2中前盖从另一角度看的结构示意图。
附图标号说明：
标号 名称 标号 名称
10 外壳 30 振膜
11 安装槽 31 环状密封凸起
20 前盖 40 金属环
21 密封裙边 50 密封圈
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，若本发明实施例中有涉及方向性指示(诸如上、下、左、右、前、后……)，则该方向性指示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，若本发明实施例中有涉及“第一”、“第二”等的描述，则该“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。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
本发明提出一种发声装置，该发声装置可为扬声器单体、扬声器模组或 终端电子设备例如手机、音响等等。
请结合参考图1和图2，发声装置包括外壳10、振动系统和磁路系统，外壳10呈两端敞口设置，即相对的两端是贯通的。振动系统收容于所述外壳10内，所述振动系统包括相互连接的振膜30和音圈，音圈固定于振膜30的一侧。振膜30包括中心部、围绕中心部设置的折环部以及围绕折环部设置的固定部，振膜30还可以包括结合于中心部的复合层。磁路系统包括导磁轭，导磁轭上设有内磁路和外磁路，内磁路和外磁路两者之间形成容纳音圈的磁间隙。
请结合参考图3至图5，本发明实施例中，所述发声装置还包括前盖20，所述前盖20与所述外壳10固定。本实施例中，前盖20为中间开口的环形结构，以便于振动系统产生的声音从前盖20的开口中出来。振膜30夹持于所述前盖20和所述外壳10之间，所述振膜30上设有环状密封凸起31，所述环状密封凸起31与所述外壳10或所述前盖20密封抵接。具体地，振膜30的固定部夹持于前盖20和外壳10之间，环状密封凸起31位于固定部，并沿着振膜30的周向延伸。
一实施例中，所述振膜30的朝向所述前盖20的表面、以及所述振膜30的朝向所述外壳10的表面均设有所述环状密封凸起31，振膜30的朝向所述前盖20的表面的环状密封凸起31与前盖20密封抵接，而振膜30的朝向所述外壳10的表面的环状密封凸起31则与外壳10密封抵接，前盖20、外壳10、振膜30组装后，振膜30边缘的环状密封凸起31被压缩，起到密封作用实现防水。此外，其它实施例中，也可仅在所述振膜30的朝向所述前盖20的表面设置环状密封凸起31，或者，仅在所述振膜30的朝向所述外壳10的表面设置所述环状密封凸起31。
需要说明的是，上述中的环状密封凸起31与振膜30为一体注塑成型，振膜30通常采用具有弹性的材质，如振膜采用橡胶或硅胶等软胶成型方式，例如振膜30具体可采用聚酰亚胺(PI)、聚氨酯(PU)或聚对苯二甲酸乙二酯(PET)等等，这类材质为弹性软质件，故形成的环状密封凸起31能够实现密封效果。
本发明实施例中，通过在振膜30上设置环状密封凸起31，环状密封凸起31能够与外壳10或前盖20密封抵接，弹性变形空间更大，故即使外壳10和 前盖20之间的表面不够平整，环状密封凸起31通过变形也能够适应外壳10和前盖20之间的缝隙，实现防水。
一实施例中，所述振膜30的朝向所述前盖20的表面、以及所述振膜30的朝向所述外壳10的表面均设有多个所述环状密封凸起31。通过在同一表面设置多个环状密封凸起31，能够形成多道密封，大大提高密封性。
一实施例中，所述环状密封凸起31的宽度在沿其凸起方向上逐渐减小，例如，环状密封凸起31的截面(该截面垂直于环状密封凸起31的延伸方向)呈半圆形、三角形或梯形等。该实施例中的宽度指的是垂直于环状密封凸起31的延伸方向，并平行于振膜30的膜面。通过将环状密封凸起31设置为根部大，顶端小的形状，当顶端受到挤压时逐渐，该形状的环状密封凸起31的自适应变形效果更好。此外，其它实施例中，环状密封凸起31的形状也不局限于上述几种，并且，环状密封凸起31两端的大小可一致。
由于振膜30一般较为柔软，容易被拉扯变形，在组装时容易发生褶皱，不易保持形态，故会导致组装困难。为解决这一技术问题，一实施例中，所述振膜30上且靠近其外周缘设有金属环40，即在固定部上设有金属环40，所述金属环40沿所述振膜30的周向延伸，如此振膜30的周缘通过金属环40支撑，振膜30周围的强度变大，可保持振膜30展开，实现更好组装。
实现金属环40和振膜30连接的方式具有多种，一实施例中，所述金属环40嵌设于所述振膜30内，例如，所述金属环40包裹在所述振膜30内，从而可防止金属环40松脱。可以想到的是，为保证金属环40包裹在振膜30内，故振膜30的固定部的厚度设置得较大。另外，也可在振膜30的固定部加工出一圈凹槽，例如振膜30通过折弯形成一圈凹槽，而将金属环40嵌入凹槽内。为方便加工成型，一实施例中，所述金属环40与所述振膜30一体注塑成型，从而可实现批量化生产，并且避免金属环40和振膜30脱离。当然，一实施例中，金属环40与振膜30也可采用粘接的方式固定。
一实施例中，环状密封凸起31在金属环40所在平面的正投影位于金属环40内，相当于将环状密封凸起31设置在振膜30的强度较大的位置，故能够保持环状密封凸起31的形态，防止其所在位置出现褶皱导致位置移动而与前盖20和外壳10的抵接面错位的现象。
为了改善现有技术中传统的塑胶外壳10壁厚的问题，本实施方式的发声 装置，外壳10通过金属粉末注射成型(MIM方式成型)，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。外壳10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。
通过金属粉末成型工艺成型后，外壳10的壳壁的厚度可以限制在较小的范围内，有利于实现整机体积的减小，同时还能够保证外壳10的强度较大。并且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外壳10壁厚，技术人员通过将0.6mm壁厚的传统塑胶壳体的发声装置与本实施方式中0.2mm外壳10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。
一实施例中，所述前盖20通过金属粉末注射成型，其成型方式请参考外壳10的成型方式，并且前盖20的材质也可为不锈钢等。同样地，前盖20采用金属粉末注射成型，能够满足前盖20的复杂形状，并实现批量生产。再者，前盖20的强度更高，更好形成振动系统的保护外壳10。可选地，前盖20和外壳10焊接固定。具体地，前盖20和外壳10周圈边缘采用激光焊接固定。前盖20、外壳10、振膜30组装后，振膜30边缘的环状密封凸起31被压缩，起到密封作用，实现防水；再加上前盖20和外壳10周圈边缘采用激光焊接固定，此种方式密封效果好，且边缘焊接后结合强度高。
请结合参考图5和图6，一实施例中，所述前盖20的外周缘设有一圈密封裙边21，所述密封裙边21朝所述外壳10的方向凸出，并抵接在所述外壳10的朝向所述前盖20的表面，所述密封裙边21与所述振膜30的周侧密封抵接。本实施例中，通过在前盖20上形成密封裙边21抵接振膜30周侧的方式，相当于将整个振膜30收容到前盖20内，限制振膜30的横向移动；并且避免了振膜30显露在外。可选地，密封裙边21的外周面与外壳10的外周面平齐。
一实施例中，所述外壳10的外周面套设有密封圈50而与整机密封连接。可选地，所述外壳10的外周面设有一圈安装槽11，安装槽11沿外壳10的周 向延伸而成环状，所述密封圈50嵌设于所述安装槽11内。通过设置安装槽11，能够防止密封圈50上下以及横向移动，实现对密封圈50的限位。并且密封圈50卡入安装槽11内，与外壳10之间的接触面积更大，密封效果更好。此外，密封圈50也可直接套设在外壳10的外周。
本发明还提出一种电子设备，该电子设备包括壳体(图未示出)以及发声装置，发声装置的具体结构请参见上述实施例，并且由于本发明实施例的电子设备采用了上述实施例中的发声装置，故具有上述实施例中的所有效果，此处不再赘述。其中，发声装置安装在壳体内，且外壳10与壳体密封抵接。具体地，外壳10上的密封圈50与壳体的内周壁密封抵接，防止水从壳体上开设的出声孔流入到外壳10的后侧。
以上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 (13)

  1. 一种发声装置，其特征在于，包括：
    外壳；
    前盖，与所述外壳固定；以及
    振膜，夹持于所述前盖和所述外壳之间，所述振膜上设有环状密封凸起，所述环状密封凸起与所述外壳或所述前盖密封抵接。
  2. 根据权利要求1所述的发声装置，其特征在于，所述振膜的朝向所述前盖的表面、以及所述振膜的朝向所述外壳的表面均设有所述环状密封凸起。
  3. 根据权利要求1所述的发声装置，其特征在于，所述环状密封凸起的宽度在沿其凸起方向上逐渐减小。
  4. 如权利要求1所述的发声装置，其特征在于，所述振膜上且靠近其外周缘设有金属环，所述金属环沿所述振膜的周向延伸。
  5. 如权利要求4所述的发声装置，其特征在于，所述金属环嵌设于所述振膜内。
  6. 如权利要求5所述的发声装置，其特征在于，所述金属环包裹在所述振膜内，所述金属环与所述振膜一体注塑成型。
  7. 如权利要求1所述的发声装置，其特征在于，所述前盖的外周缘设有一圈密封裙边，所述密封裙边朝所述外壳的方向凸出，并抵接在所述外壳的朝向所述前盖的表面，所述密封裙边与所述振膜的周侧密封抵接。
  8. 如权利要求1至7任意一项所述的发声装置，其特征在于，所述前盖通过金属粉末注射成型。
  9. 如权利要求8所述的发声装置，其特征在于，所述外壳通过金属粉末注射成型。
  10. 如权利要求9所述的发声装置，其特征在于，所述外壳和所述前盖焊接固定。
  11. 如权利要求1所述的发声装置，其特征在于，所述外壳的外周面套设有密封圈而与整机密封连接。
  12. 如权利要求11所述的发声装置，其特征在于，所述外壳的外周面设有一圈安装槽，所述密封圈嵌设于所述安装槽内。
  13. 一种电子设备，其特征在于，所述电子设备包括：
    壳体；以及
    如权利要求1-12任意一项所述的发声装置，所述发声装置容置于所述壳体内，且所述发声装置的外壳与所述壳体密封抵接。
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