WO2021174569A1 - 扬声器 - Google Patents

扬声器 Download PDF

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Publication number
WO2021174569A1
WO2021174569A1 PCT/CN2020/078760 CN2020078760W WO2021174569A1 WO 2021174569 A1 WO2021174569 A1 WO 2021174569A1 CN 2020078760 W CN2020078760 W CN 2020078760W WO 2021174569 A1 WO2021174569 A1 WO 2021174569A1
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WO
WIPO (PCT)
Prior art keywords
diaphragm
housing
sound
fixed
connecting frame
Prior art date
Application number
PCT/CN2020/078760
Other languages
English (en)
French (fr)
Inventor
令狐荣林
章统
肖波
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 WO2021174569A1 publication Critical patent/WO2021174569A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • 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 used in portable electronic products.
  • the loudspeaker includes a box body with a containing 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 improving the sensitivity of the speaker.
  • the object of the present invention is to provide a speaker, which can increase the effective vibration area, thereby improving the sensitivity of the speaker.
  • the present invention provides a speaker, including a vibration system and a magnetic circuit system that drives the vibration system to vibrate and produce sound.
  • a voice coil that drives the diaphragm to vibrate and produce sound in the gap.
  • the speaker further includes a housing for accommodating and holding the vibration system and the magnetic circuit system.
  • the housing has an accommodating space, and the accommodating space is The vibration system and the magnetic circuit system are divided into an upper membrane anterior cavity, a lower membrane anterior cavity, and a posterior cavity.
  • the second sound outlet communicated with the front cavity the diaphragm includes an upper diaphragm and a lower diaphragm that are opposed and spaced apart, and outer edges of the upper diaphragm and the lower diaphragm are fixed on the housing, so
  • the lower diaphragm is arranged around the magnetic circuit system, and the vibration system further includes a skeleton.
  • the skeleton includes a connection part connected with the upper diaphragm and a connection part connected with the connection part and arranged around the magnetic circuit system.
  • a connecting frame, the inner edge of the lower diaphragm is fixed on the connecting frame, wherein a splint arranged around the connecting frame and fixed to the housing is provided between the upper diaphragm and the lower diaphragm , And the upper diaphragm, the lower diaphragm, the splint, and the connecting frame divide the inner space of the housing into an upper diaphragm front cavity for the upper diaphragm to emit sound, and for the lower diaphragm.
  • the second sound hole connected to the front cavity of the inferior membrane.
  • the connecting portion and the connecting frame are arranged at intervals along the vibration direction, and they are connected by connecting ribs.
  • opposite sides of the connecting portion along the vibration direction are respectively connected to the voice coil and the upper diaphragm.
  • the upper diaphragm includes a diaphragm body and a dome
  • the diaphragm body includes a folding ring portion, a fixing portion extending outwardly from the folding ring portion, and a flat portion extending inwardly from the folding ring portion.
  • the fixing part is fixed on the housing, wherein the opposite sides of the dome in the vibration direction are respectively connected to the flat part and the connecting part, or the flat part is opposite to each other in the vibration direction The two sides are respectively connected with the dome and the connecting part.
  • the opening of the folding ring portion faces the splint.
  • the flat portion has a cut hole, and the dome covers the cut hole.
  • the connecting portion has a ring structure.
  • the inner edge of the lower diaphragm is fixed on the surface of the connecting frame away from the upper diaphragm.
  • the splint includes a holding portion fixed to the housing, a first extension portion formed by bending and extending in the direction of the lower diaphragm from an end of the holding portion away from the housing, and a first extension portion formed from the first extension A second extension portion formed by bending and extending one end of the portion away from the holding portion toward the connecting frame, and the second extension portion is spaced apart from the connecting frame.
  • the first sound outlet hole and the second sound outlet hole are located on the same side wall of the housing.
  • the housing includes a front cover, a middle frame, and a rear cover arranged in order along the vibration direction, the outer edge of the upper diaphragm is sandwiched between the front cover and the middle frame, and the lower diaphragm The outer edge is sandwiched between the middle frame and the back cover, the splint is fixed to the middle frame, the magnetic circuit system is fixed to the back cover, and the upper diaphragm is connected to the front cover.
  • the cover is enclosed to form the upper membrane anterior cavity
  • the surface of the splint facing the lower diaphragm and the connecting frame, the lower diaphragm and the middle frame are enclosed to form the inferior membrane anterior cavity, wherein:
  • the first sound hole is located on the front cover, and the second sound hole is located on the middle frame.
  • the speaker of the present invention produces sound through the vibration of the upper diaphragm and the lower diaphragm, which can greatly increase the effective vibration area of the speaker to improve the sensitivity of the speaker;
  • the inner edge of the diaphragm is fixed on the connecting frame, which not only increases the effective vibration area of the lower diaphragm, but also suppresses the vibration of the voice coil at large amplitudes, and can also avoid the back cavity and
  • the acoustic short circuit caused by the communication of the front cavity of the lower membrane can improve the performance of the product.
  • the mutual influence of the posterior cavity and the inferior anterior cavity can be adjusted by adjusting the distance between the connecting frame and the splint, so that the product performance can be adjusted.
  • Figure 1 is an exploded view of a preferred embodiment of the speaker of the present invention
  • FIG. 2 is a schematic diagram of the structure of the speaker shown in FIG. 1 after being assembled
  • Figure 3 is a cross-sectional view of the loudspeaker shown in Figure 2 along the A-A direction;
  • Figure 4 is a cross-sectional view of the loudspeaker shown in Figure 2 along the B-B direction;
  • Fig. 5 is a schematic diagram of the structure of the skeleton in the speaker shown in Fig. 1.
  • the speaker 100 includes a housing 1, a vibration system 3 and a magnetic circuit system 5.
  • the housing 1 accommodates and holds the vibration system 3 and the magnetic circuit system 5, and the magnetic circuit system 5 drives the vibration system 3 to vibrate and produce sound.
  • the shell 1 is provided with a first sound hole 1A and a second sound hole 1B through it. As shown in FIG. 2, the first sound outlet 1A and the second sound outlet 1B are located on the same side wall of the housing 1.
  • the magnetic circuit system 5 includes a yoke 51 fixed on the housing 1, a main magnet 53 and a secondary magnet 55 fixed on the yoke 51, and a main pole core 57 fixed on the main magnet 53 And a secondary pole core 59 fixed on the secondary magnet 57, the secondary magnet 55 is arranged around the main magnet 53 and a magnetic gap 5A is formed between them. As shown in FIGS. 3 and 4, the main pole core 57 and the secondary pole core 59 are located in the same horizontal plane.
  • the auxiliary magnet 55 may be a ring magnet having a ring structure, or may be a bar magnet arranged around the main magnet 53.
  • the secondary magnet 55 is a bar magnet, and there are four secondary magnets 55, which are two first secondary magnets arranged at intervals along the short axis side of the main magnet 53 and
  • the main magnet 53 has two second sub-magnets spaced apart on the long axis side.
  • the secondary pole core 59 may be a ring-shaped pole core having a ring structure, or a strip-shaped pole core. As shown in FIG. 1, the secondary pole core 59 is an annular pole core fixed on the two first secondary magnets and the two second secondary magnets.
  • the main magnet 53 and the auxiliary magnet 55 are both magnetic steel. It is understandable that the main magnet 53 and the auxiliary magnet 55 may also be natural magnets.
  • the yoke 51, the main pole core 57, and the secondary pole core 59 are made of magnetically conductive materials. Through the magnetic permeability of the yoke 51, the main pole core 57, and the secondary pole core 59, the magnetic flux in the magnetic gap 5A can be effectively increased, so that the acoustic performance of the speaker 100 can be improved, and it is also beneficial to The thin and light design of the speaker 100.
  • the vibration system 3 includes a diaphragm 31, a voice coil 33 inserted into the magnetic gap 5A and driving the diaphragm 31 to vibrate and produce sound, and a skeleton 35.
  • the diaphragm 31 includes an upper diaphragm 37 and a lower diaphragm 39 arranged opposite and spaced apart. The outer edges of the upper diaphragm 37 and the lower diaphragm 39 are held on the housing 1, and the lower diaphragm 39 is arranged around the magnetic circuit system 5.
  • the frame 35 includes a connecting portion 351 connected to the upper diaphragm 37 and a connecting frame 353 connected to the connecting portion 351 and arranged around the magnetic circuit system 5.
  • the inner edge of the lower diaphragm 39 is fixed on The connecting frame 353 is on.
  • a splint 7 arranged around the connecting frame 353 and fixed to the housing 1, and the upper diaphragm 37 and the lower diaphragm 39.
  • the splint 7 and the connecting frame 353 divide the internal space 1a of the housing 1 into an upper diaphragm front cavity 11a for the upper diaphragm 37 to emit sound, and a lower diaphragm for the lower diaphragm 39 to emit sound.
  • the front cavity 13a and the rear cavity 15a shared by the upper diaphragm 37 and the lower diaphragm 39 (specifically, the surface of the upper diaphragm 37 facing away from the lower diaphragm 39 is enclosed by the housing 1
  • the upper diaphragm front cavity 11a; the surface of the splint 7 facing the lower diaphragm 39, the connecting frame 353, the lower diaphragm 39 and the housing 1 enclose to form the lower diaphragm front cavity 13a;
  • the internal space 1a is the posterior cavity 15a) except for the acoustic space of the upper anterior cavity 11a and the inferior anterior cavity 13a, and the upper anterior cavity 11a is in communication with the first sound outlet 1A,
  • the front inferior cavity 13a is in communication with the second sound outlet 1B.
  • the upper diaphragm 37, the lower diaphragm 39 and the skeleton 35 vibrate together with the voice coil 33.
  • the sound waves generated by the vibration of the upper diaphragm 37 are radiated to the outside of the speaker 100 through the upper diaphragm front cavity 11a and the first sound outlet 1A, and the sound waves generated by the vibration of the lower diaphragm 39 pass through the The lower diaphragm front cavity 13a and the second sound hole 1B radiate to the outside of the speaker 100, so that the effective vibration area of the speaker 100 is greatly increased to improve the sensitivity of the speaker; at the same time, the inner portion of the lower diaphragm 39
  • the edge is fixed on the connecting frame 353, which not only increases the effective vibration area of the lower diaphragm 39, but also suppresses the vibration of the voice coil 33 when the amplitude is large, and can also avoid the rear cavity 15a and The acoustic short-circuit problem
  • the joint between the splint 7 and the connecting frame 353 cannot physically cut off air.
  • the splint 7 includes a holding portion 71 fixed to the housing 1, a first extension portion 73 formed by bending and extending in the direction of the lower diaphragm 39 from an end of the holding portion 71 away from the housing 1, and a self-supporting portion.
  • An end of the first extension portion 73 away from the holding portion 71 is bent and extends toward the connecting frame 353 to form a second extension portion 75, and the second extension portion 75 is spaced apart from the connecting frame 353.
  • the volume of the lower diaphragm front cavity 13a can be effectively increased, so that the vibration performance of the lower diaphragm 39 can be improved.
  • the inner edge of the lower diaphragm 39 is fixed on the surface of the connecting frame 353 away from the upper diaphragm 37. It is understandable that, in other embodiments, the inner edge of the lower diaphragm 39 may also be fixed on the surface of the connecting frame 353 facing the magnetic circuit system 5, or the lower diaphragm 39 The inner edge of is fixed on the surface of the connecting frame 353 facing away from the magnetic circuit system 5.
  • the connecting portion 351 and the connecting frame 353 are spaced apart along the vibration direction X, and they are connected by connecting ribs 355.
  • the connecting portion 351 is connected to the voice coil 33 and the upper diaphragm 37 on opposite sides of the vibration direction X, respectively.
  • the upper diaphragm 37 includes a diaphragm body 371 and a dome 373.
  • the diaphragm body 371 includes a folding ring portion 375, a fixing portion 377 extending from the folding ring portion 375, and a fixed portion 377 extending from the folding ring portion 375.
  • a flat portion 379 formed by an inner extension, and the fixing portion 377 is fixed on the housing 1.
  • the opposite sides of the dome 373 along the vibration direction X are respectively connected to the flat portion 379 and the connecting portion 353.
  • the flat portion 379 is connected to the dome 373 and the connecting portion 351 on opposite sides of the flat portion 379 along the vibration direction X, respectively.
  • the opening of the folding ring portion 375 faces the splint 7. In this way, the upper diaphragm 37 and the lower diaphragm 39 can have sufficient vibration space.
  • the connecting portion 353 has a ring structure. It is understandable that in other embodiments, the connecting portion may also be in the shape of a flat plate, and when the connecting portion is in the shape of a flat plate, the connecting portion may also act as a dome top (that is, it may not Set the dome 373).
  • the flat portion 379 has a cut hole 37A, and the spherical top 373 covers the cut hole 37A. It can be understood that, in other embodiments, the flat portion 379 may not have the cut hole.
  • the housing 1 includes a front cover 11, a middle frame 13, and a rear cover 15 arranged in order along the vibration direction X, and the outer edge of the upper diaphragm 37 is sandwiched between the front cover 11 and the middle frame 13, and The outer edge of the lower diaphragm 39 is sandwiched between the middle frame 13 and the back cover 15, the splint 7 is fixed to the middle frame 13, and the magnetic circuit system 5 is fixed to the back cover 1, the upper diaphragm 37 and the front cover 11 enclose the upper diaphragm front cavity 11a, the splint 7 faces the surface of the lower diaphragm 39 and the connecting frame 353, the lower diaphragm
  • the membrane 39 and the middle frame 13 enclose the lower membrane front cavity 13a, wherein the first sound outlet 1A is located on the front cover 11, and the second sound outlet 1B is located on the middle frame 13 on.
  • the speaker of the present invention produces sound through the vibration of the upper diaphragm 37 and the lower diaphragm 39, which can greatly increase the effective vibration area of the speaker 100 to improve the sensitivity of the speaker;
  • the inner edge of the lower diaphragm 39 is fixed on the connecting frame 353, which not only increases the effective vibration area of the lower diaphragm 39, but also suppresses the vibration of the voice coil 33 when the amplitude is large.
  • the problem of acoustic short circuit caused by the communication between the rear cavity 15a and the inferior anterior cavity 13a can be avoided, so that the performance of the product can be improved.
  • the mutual influence of the posterior cavity 15a and the inferior anterior cavity 13a can be adjusted by adjusting the distance between the connecting frame 353 and the splint 7, so that the product performance can be adjusted.

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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

本发明提供了一种可以提高有效振动面积的扬声器，其包括外壳、振动系统及磁路系统，振动系统包括振膜、驱动振膜振动发声的音圈及骨架，振膜包括相对且间隔设置的上振膜和下振膜，上振膜和下振膜的外边缘固定于外壳上，下振膜环绕磁路系统设置，骨架包括与上振膜连接的连接部及与连接部连接并环绕磁路系统设置的连接框，下振膜的内边缘固定在连接框上，其中，上振膜和下振膜之间设有环绕连接框设置且固定于外壳的夹板，且上振膜、下振膜、夹板及连接框将外壳的内部空间划分为用于上振膜发声的上膜前腔、用于下振膜发声的下膜前腔及上振膜和下振膜共用的后腔；外壳上贯穿设有与上膜前腔连通的第一出音孔及与下膜前腔连通的第二出音孔。

Description

扬声器 技术领域
本发明涉及声电领域，尤其涉及一种运用于便携式电子产品的扬声器。
 背景技术
随着移动互联网时代的到来，智能移动设备的数量不断上升。而在众多移动设备之中，手机无疑是最常见、最便携的移动终端设备。目前，手机的功能极其多样，其中之一便是高品质的音乐功能，因此，用于播放声音的扬声器被大量应用到现在的智能移动设备之中。
扬声器包括具有容纳腔的箱体及设于所述箱体内的发声器件，所述箱体上贯穿设有出声孔。相关技术中的发声器件仅具有一个发声面，从而不利于扬声器灵敏度的提高。
因此，实有必要提供一种新的扬声器解决上述技术问题。
 技术问题
本发明的目的在于提供一种扬声器，该扬声器可以提高有效振动面积，从而可以提高扬声器的灵敏度。
 技术解决方案
为了达到上述目的，本发明提供了一种扬声器，包括振动系统及驱动所述振动系统振动发声的磁路系统，所述磁路系统具有磁间隙，所述振动系统包括振膜及插入所述磁间隙内并驱动所述振膜振动发声的音圈，所述扬声器还包括收容并固持所述振动系统和所述磁路系统的外壳，所述外壳具有收容空间，且所述收容空间被所述振动系统和所述磁路系统划分为上膜前腔、下膜前腔及后腔，所述外壳上贯穿设有与所述上膜前腔连通的第一出音孔及与所述下膜前腔连通的第二出音孔，所述振膜包括相对且间隔设置的上振膜和下振膜，所述上振膜和所述下振膜的外边缘固定于所述外壳上，所述下振膜环绕所述磁路系统设置，所述振动系统还包括骨架，所述骨架包括与所述上振膜连接的连接部及与所述连接部连接并环绕所述磁路系统设置的连接框，所述下振膜的内边缘固定在所述连接框上，其中，所述上振膜和所述下振膜之间设有环绕所述连接框设置且固定于所述外壳的夹板，且所述上振膜、所述下振膜、所述夹板及所述连接框将所述外壳的内部空间划分为用于所述上振膜发声的上膜前腔、用于所述下振膜发声的下膜前腔及所述上振膜和所述下振膜共用的后腔；所述外壳上贯穿设有与所述上膜前腔连通的第一出音孔及与所述下膜前腔连通的第二出音孔。
优选地，所述连接部和所述连接框沿振动方向间隔设置且二者之间通过连接筋连接。
优选地，所述连接部沿振动方向的相对两侧分别与所述音圈和所述上振膜连接。
优选地，所述上振膜包括膜本体及球顶，所述膜本体包括折环部、自所述折环部向外延伸形成的固定部及自所述折环部向内延伸形成的平坦部，所述固定部固定在所述外壳上，其中，所述球顶沿振动方向的相对两侧分别与所述平坦部和所述连接部连接，或者，所述平坦部沿振动方向的相对两侧分别与所述球顶和所述连接部连接。
优选地，所述折环部的开口朝向所述夹板。
优选地，所述平坦部具有切中孔，所述球顶覆盖所述切中孔。
优选地，所述连接部呈环状结构。
优选地，所述下振膜的内边缘固定在所述连接框远离所述上振膜的表面上。
优选地，所述夹板包括固定于所述外壳的固持部、自所述固持部远离所述外壳的一端向所述下振膜方向弯折延伸形成的第一延伸部及自所述第一延伸部远离所述固持部的一端向所述连接框方向弯折延伸形成的第二延伸部，所述第二延伸部与所述连接框间隔设置。
优选地，所述第一出音孔和所述第二出音孔位于所述外壳的同一侧壁上。
优选地，所述外壳包括沿振动方向依次设置的前盖、中框及后盖，所述上振膜的外边缘夹设于所述前盖和所述中框之间，所述下振膜的外边缘夹设于所述中框和所述后盖之间，所述夹板固定于所述中框，所述磁路系统固定于所述后盖上，所述上振膜与所述前盖围合形成所述上膜前腔，所述夹板朝向所述下振膜的表面与所述连接框、所述下振膜及所述中框围合形成所述下膜前腔，其中，所述第一出音孔位于所述前盖上，所述第二出音孔位于所述中框上。
 有益效果
与相关技术相比，本发明的扬声器通过所述上振膜和所述下振膜振动发声，可以使得所述扬声器的有效振动面积大幅提高以提高扬声器的灵敏度；同时，还通过将所述下振膜的内边缘固定在所述连接框上，不仅使得所述下振膜在起到增加有效振动面积的同时还能抑制所述音圈大振幅时的摇摆，而且可以避免所述后腔和所述下膜前腔连通导致的声短路问题，从而可以提高产品的性能。此外，还可以通过调节所述连接框与所述夹板之间的间距，来调整所述后腔和所述下膜前腔的相互影响，从而可对产品性能进行调节。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例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获得其它的附图，其中：
图1为本发明扬声器一较佳实施例的分解图；
图2为图1所示扬声器组装后的结构示意图；
图3为图2所示扬声器沿A-A方向的剖示图；
图4为图2所示扬声器沿B-B方向的剖示图；
图5为图1所示扬声器中骨架的结构示意图。
 本发明的实施方式
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做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
请结合参阅图1至图5，扬声器100包括外壳1、振动系统3及磁路系统5。所述外壳1收容并固持所述振动系统3和所述磁路系统5，所述磁路系统5驱动所述振动系统3振动发声。
所述外壳1上贯穿设有第一出音孔1A及第二出音孔1B。如图2所示，所述第一出音孔1A和所述第二出音孔1B位于所述外壳1的同一侧壁上。
所述磁路系统5包括固持于所述外壳1的磁轭51、固设于所述磁轭51上的主磁体53和副磁体55、固设于所述主磁体53上的主极芯57及固设于所述副磁体57上的副极芯59，所述副磁体55环绕所述主磁体53设置且二者之间形成磁间隙5A。如图3和图4所示，所述主极芯57和所述副极芯59位于同一水平面内。
其中，所述副磁体55可以为呈环状结构的环状磁体，也可以为环绕所述主磁体53设置的条形磁体。如图1所示，所述副磁体55为条形磁体，所述副磁体55设有四个，分别为沿所述主磁体53的短轴边间隔设置的两个第一副磁体以及沿所述主磁体53的长轴边间隔设置的两个第二副磁体。
在本实施例中，所述副极芯59可以为呈环状结构的环状极芯，也可以为条形极芯。如图1所示，所述副极芯59为固定在两个所述第一副磁体和两个所述第二副磁体上的环状极芯。
在本实施例中，所述主磁体53和所述副磁体55均为磁钢。可以理解的是，所述主磁体53和所述副磁体55也可以为天然磁石。
所述磁轭51、所述主极芯57及所述副极芯59由导磁材料制成。通过所述磁轭51、所述主极芯57及所述副极芯59的导磁作用，可以有效增加所述磁间隙5A内的磁通量，从而可以提高扬声器100的声学性能，同时也有利于扬声器100的轻薄化设计。
所述振动系统3包括振膜31、插入所述磁间隙5A内并驱动所述振膜31振动发声的音圈33及骨架35。
所述振膜31包括相对且间隔设置的上振膜37和下振膜39，所述上振膜37和所述下振膜39的外边缘固持于所述外壳1上，所述下振膜39环绕所述磁路系统5设置。
所述骨架35包括与所述上振膜37连接的连接部351及与所述连接部351连接并环绕所述磁路系统5设置的连接框353，所述下振膜39的内边缘固定在所述连接框353上。
其中，所述上振膜37和所述下振膜39之间设有环绕所述连接框353设置且固定于所述外壳1的夹板7，且所述上振膜37、所述下振膜39、所述夹板7及所述连接框353将所述外壳1的内部空间1a划分为用于所述上振膜37发声的上膜前腔11a、用于所述下振膜39发声的下膜前腔13a及所述上振膜37和所述下振膜39共用的后腔15a（具体地，所述上振膜37背离所述下振膜39的表面与所述外壳1围合形成所述上膜前腔11a；所述夹板7朝向所述下振膜39的表面、所述连接框353、所述下振膜39及所述外壳1围合形成所述下膜前腔13a；所述内部空间1a除所述上膜前腔11a和所述下膜前腔13a的声空间为所述后腔15a），所述上膜前腔11a与所述第一出音孔1A连通，所述下膜前腔13a与所述第二出音孔1B连通。所述音圈33通电后，在所述磁路系统5的磁力作用下，所述上振膜37、所述下振膜39及所述骨架35随所述音圈33一同振动。由于所述上振膜37振动产生的声波通过所述上膜前腔11a和所述第一出音孔1A辐射至所述扬声器100外，以及所述下振膜39振动产生的声波通过所述下膜前腔13a和所述第二出音孔1B辐射至所述扬声器100外，从而使得所述扬声器100的有效振动面积大幅提高以提高扬声器的灵敏度；同时，所述下振膜39的内边缘固定在所述连接框353上，不仅使得所述下振膜39在起到增加有效振动面积的同时还能抑制所述音圈33大振幅时的摇摆，而且可以避免所述后腔15a和所述下膜前腔13a在所述下振膜39于所述连接框353的连接处连通导致的声短路问题，从而可以提高产品的性能，尤其是对于超大振幅的扬声器，效果更加明显。此外，还可以通过调节所述连接框353与所述夹板7之间的间距，来调整所述后腔15a和所述下膜前腔13a的相互影响，从而可对产品性能进行调节。
需要说明的是，所述夹板7与所述连接框353的结合处并不能物理隔断空气，所述夹板7与所述连接框353的结合处的间隙宽度越小，所述夹板7与所述连接框353的结合处的声阻越大，声阻越大，所述后腔15a和所述下膜前腔13a发生声短路的风险越小。因此，通过调节所述连接框353与所述夹板7之间的间距，可以调整所述后腔15a和所述下膜前腔13a的相互影响，从而可对产品性能进行调节。
所述夹板7包括固定于所述外壳1的固持部71、自所述固持部71远离所述外壳1的一端向所述下振膜39方向弯折延伸形成的第一延伸部73及自所述第一延伸部73远离所述固持部71的一端向所述连接框353方向弯折延伸形成的第二延伸部75，所述第二延伸部75与所述连接框353间隔设置。这样可以有效增大所述下膜前腔13a的体积，从而可以提高所述下振膜39的振动性能。
如图3和图4所示，所述下振膜39的内边缘固定在所述连接框353远离所述上振膜37的表面上。可以理解的是，在其他实施例中，所述下振膜39的内边缘还可以固定在所述连接框353朝向所述磁路系统5一侧的表面上，或者，所述下振膜39的内边缘固定在所述连接框353背离所述磁路系统5一侧的表面上。
如图3、图4及图5所示，所述连接部351和所述连接框353沿振动方向X间隔设置且二者之间通过连接筋355连接。
如图3和图4所示，所述连接部351沿振动方向X的相对两侧分别与所述音圈33和所述上振膜37连接。
所述上振膜37包括膜本体371及球顶373，所述膜本体371包括折环部375、自所述折环部375向外延伸形成的固定部377及自所述折环部375向内延伸形成的平坦部379，所述固定部377固定在所述外壳1上。如图3和图4所示，所述球顶373沿振动方向X的相对两侧分别与所述平坦部379和所述连接部353连接。可以理解的是，在其他实施例中，所述平坦部379沿振动方向X的相对两侧分别与所述球顶373和所述连接部351连接。
在本实施例中，所述折环部375的开口朝向所述夹板7。这样可以使得所述上振膜37和所述下振膜39具有足够的振动空间。
在本实施例中，所述连接部353呈环状结构。可以理解的是，在其他实施例中，所述连接部也可以呈平板状，且当所述连接部呈平板状时，所述连接部还可以充当球顶的作用（也就是说，可以不设置所述球顶373）。
在本实施例中，所述平坦部379具有切中孔37A，所述球顶373覆盖所述切中孔37A。可以理解的是，在其他实施例中，所述平坦部379可以不具有所述切中孔。
所述外壳1包括沿振动方向X依次设置的前盖11、中框13及后盖15，所述上振膜37的外边缘夹设于所述前盖11和所述中框13之间，所述下振膜39的外边缘夹设于所述中框13和所述后盖15之间，所述夹板7固定于所述中框13，所述磁路系统5固定于所述后盖1上，所述上振膜37与所述前盖11围合形成所述上膜前腔11a，所述夹板7朝向所述下振膜39的表面与所述连接框353、所述下振膜39及所述中框13围合形成所述下膜前腔13a，其中，所述第一出音孔1A位于所述前盖11上，所述第二出音孔1B位于所述中框13上。
与相关技术相比，本发明的扬声器通过所述上振膜37和所述下振膜39振动发声，可以使得所述扬声器100的有效振动面积大幅提高以提高扬声器的灵敏度；同时，还通过将所述下振膜39的内边缘固定在所述连接框353上，不仅使得所述下振膜39在起到增加有效振动面积的同时还能抑制所述音圈33大振幅时的摇摆，而且可以避免所述后腔15a和所述下膜前腔13a连通导致的声短路问题，从而可以提高产品的性能。此外，还可以通过调节所述连接框353与所述夹板7之间的间距，来调整所述后腔15a和所述下膜前腔13a的相互影响，从而可对产品性能进行调节。
以上所述的仅是本发明的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出改进，但这些均属于本发明的保护范围。

Claims (11)

  1. 一种扬声器，包括振动系统及驱动所述振动系统振动发声的磁路系统，所述磁路系统具有磁间隙，所述振动系统包括振膜及插入所述磁间隙内并驱动所述振膜振动发声的音圈，其特征在于，所述扬声器还包括收容并固持所述振动系统和所述磁路系统的外壳，所述振膜包括相对且间隔设置的上振膜和下振膜，所述上振膜和所述下振膜的外边缘固定于所述外壳上，所述下振膜环绕所述磁路系统设置，所述振动系统还包括骨架，所述骨架包括与所述上振膜连接的连接部及与所述连接部连接并环绕所述磁路系统设置的连接框，所述下振膜的内边缘固定在所述连接框上，其中，所述上振膜和所述下振膜之间设有环绕所述连接框设置且固定于所述外壳的夹板，且所述上振膜、所述下振膜、所述夹板及所述连接框将所述外壳的内部空间划分为用于所述上振膜发声的上膜前腔、用于所述下振膜发声的下膜前腔及所述上振膜和所述下振膜共用的后腔；所述外壳上贯穿设有与所述上膜前腔连通的第一出音孔及与所述下膜前腔连通的第二出音孔。
  2. 根据权利要求1所述的扬声器，其特征在于，所述连接部和所述连接框沿振动方向间隔设置且二者之间通过连接筋连接。
  3. 根据权利要求2所述的扬声器，其特征在于，所述连接部沿振动方向的相对两侧分别与所述音圈和所述上振膜连接。
  4. 根据权利要求3所述的扬声器，其特征在于，所述上振膜包括膜本体及球顶，所述膜本体包括折环部、自所述折环部向外延伸形成的固定部及自所述折环部向内延伸形成的平坦部，所述固定部固定在所述外壳上，其中，所述球顶沿振动方向的相对两侧分别与所述平坦部和所述连接部连接，或者，所述平坦部沿振动方向的相对两侧分别与所述球顶和所述连接部连接。
  5. 根据权利要求4所述的扬声器，其特征在于，所述折环部的开口朝向所述夹板。
  6. 根据权利要求4所述的扬声器，其特征在于，所述平坦部具有切中孔，所述球顶覆盖所述切中孔。
  7. 根据权利要求3所述的扬声器，其特征在于，所述连接部呈环状结构。
  8. 根据权利要求1所述的扬声器，其特征在于，所述下振膜的内边缘固定在所述连接框远离所述上振膜的表面上。
  9. 根据权利要求1所述的扬声器，其特征在于，所述夹板包括固定于所述外壳的固持部、自所述固持部远离所述外壳的一端向所述下振膜方向弯折延伸形成的第一延伸部及自所述第一延伸部远离所述固持部的一端向所述连接框方向弯折延伸形成的第二延伸部，所述第二延伸部与所述连接框间隔设置。
  10. 根据权利要求1所述的扬声器，其特征在于，所述第一出音孔和所述第二出音孔位于所述外壳的同一侧壁上。
  11. 根据权利要求1-10中任一项所述的扬声器，其特征在于，所述外壳包括沿振动方向依次设置的前盖、中框及后盖，所述上振膜的外边缘夹设于所述前盖和所述中框之间，所述下振膜的外边缘夹设于所述中框和所述后盖之间，所述夹板固定于所述中框，所述磁路系统固定于所述后盖上，所述上振膜与所述前盖围合形成所述上膜前腔，所述夹板、所述连接框、所述下振膜及所述中框围合形成所述下膜前腔，其中，所述第一出音孔位于所述前盖上，所述第二出音孔位于所述中框上。
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