WO2023029722A1

WO2023029722A1 - Sound emitting device for electronic device, and electronic device

Info

Publication number: WO2023029722A1
Application number: PCT/CN2022/103323
Authority: WO
Inventors: 李波波; 曹明君
Original assignee: 歌尔股份有限公司
Priority date: 2021-08-31
Filing date: 2022-07-01
Publication date: 2023-03-09
Also published as: CN113660589B; CN113660589A

Abstract

Disclosed in the present invention are a sound emitting device for an electronic device, and an electronic device. The sound emitting device comprises a housing, a vibration system, and a magnetic circuit system. The vibration system comprises a diaphragm and a voice coil for driving the diaphragm to vibrate in a first direction. The magnetic circuit system comprises a magnet yoke, and a central magnetic circuit structure and a side magnetic circuit structure which are disposed on the magnet yoke. A magnetic gap is formed between the central magnetic circuit structure and the side magnetic circuit structure. The voice coil is arranged corresponding to the magnetic gap. The central magnetic circuit structure comprises a central magnet. The side magnetic circuit structure comprises side magnets. The side magnets are arranged on the outer peripheral side of the central magnet. The central magnet and the side magnets are magnetized in the circumferential direction. At least some of magnetic induction lines in the side magnets and the central magnet extend towards a direction close to the magnetic gap, and are formed into a closed magnetic induction line to pass through the voice coil in a direction perpendicular to the first direction. The present invention can effectively reduce the distortion of the sound emitting device, especially the low frequency distortion, and improve the sound quality of the sound emitting device without increasing the appearance size of the sound emitting device.

Description

Sound generating device for electronic device and electronic device

technical field

The invention relates to the technical field of acoustic devices, in particular to a sound-generating device for an electronic device and the electronic device.

Background technique

Sound-generating devices, such as micro-speakers, are widely used in electronic devices such as modern portable, communication, and smart devices due to their small size, and users' demands for high-quality speakers are also increasing.

Loudness (sensitivity, is the main indicator of the loudspeaker, and the driving force factor BL value (the wire length L of a certain number of turns multiplied by the magnetic flux density per unit area B) is a key factor affecting the sensitivity of the loudspeaker. In the magnetic circuit design of the existing loudspeaker, In the magnetic gap, the magnetic flux density in the area facing the central washer and the side washer is the largest, but due to the limitation of the vibration space in the speaker, the position of the voice coil in the magnetic gap cannot be adjusted freely, and most of the structure of the voice coil is located on the magnetic induction line Outside the dense area, the BL value of the driving force factor is not high, which affects the sensitivity of the speaker, resulting in poor sound quality of the speaker. At the same time, the magnetic flux density distribution in the magnetic gap is uneven, and the symmetry of the BL curve is poor, resulting in the driving force when the voice coil vibrates up and down. Unbalanced, high speaker distortion, especially high low-frequency distortion, which affects the acoustic performance of the speaker.

Contents of the invention

The main purpose of the present invention is to provide a sounding device and electronic device for electronic devices, aiming to solve the problems of high distortion and poor sound quality of the sounding device in the prior art.

In order to achieve the above object, the present invention proposes a sound-generating device for an electronic device, including a housing, a vibration system and a magnetic circuit system, the vibration system includes a diaphragm and a voice coil that drives the diaphragm to vibrate in a first direction The magnetic circuit system includes a yoke, a central magnetic circuit structure and a side magnetic circuit structure arranged on the yoke, a magnetic gap is formed between the central magnetic circuit structure and the side magnetic circuit structure, and the sound The ring corresponds to the magnetic gap setting;

The central magnetic circuit structure includes a central magnet, the side magnetic circuit structure includes a side magnet, and the side magnet is arranged on the outer peripheral side of the central magnet, and both the central magnet and the side magnet are magnetized along the circumferential direction, At least a part of the magnetic field lines in the side magnets extend toward the direction close to the magnetic gap, at least part of the magnetic field lines in the central magnet extend toward the direction close to the magnetic gap, and the inner side magnets face toward the direction close to the magnetic gap. The magnetic flux extending in the direction of the magnetic gap and the magnetic flux extending in the direction of the magnetic gap in the central magnet are formed to close the magnetic flux to pass through the sound in a direction perpendicular to the first direction. lock up.

Preferably, the central magnet includes magnetization areas with different magnetization directions, the number of the magnetization areas is consistent with the number of the side magnets and corresponds one to one, and the magnetization direction of each magnetization area corresponds to The magnetization directions of the side magnets correspond to form closed magnetic induction lines passing through the voice coil in a direction perpendicular to the first direction.

Preferably, the magnetic induction distribution plane formed by the central magnet magnetized along the circumferential direction and the magnetic induction distribution plane formed by the side magnets magnetized along the circumferential direction are both parallel to the first direction.

Preferably, the side magnetic circuit structure includes a plurality of the side magnets, each of the side magnets is in a bar shape and is magnetized along the circumferential direction, and the plurality of side magnets are symmetrically arranged in pairs on the central magnet The voice coil extends along the first direction and is suspended in the magnetic gap.

Preferably, the central magnet has a rectangular structure, and the central magnet includes two opposite long sides and two opposite short sides;

Each of the long sides is correspondingly provided with one of the side magnets; or,

Each of the long sides and each of the short sides is correspondingly provided with one side magnet.

Preferably, the side magnet has an integral annular structure, the side magnet is arranged around the outer peripheral side of the central magnet, and a ring-shaped magnetic gap is formed between the central magnet and the side magnet, so The voice coil has a flat structure and is arranged above the magnetic gap.

Preferably, the central magnetic circuit structure further includes a central washer, and the central washer is disposed on a side of the central magnet away from the yoke.

Preferably, the side of the side magnet facing away from the yoke is flush with the side of the central washer facing away from the central magnet.

Preferably, the diaphragm includes a central part, a ring part and a fixed part arranged sequentially from inside to outside, the central part is connected to the voice coil, and the fixed part is fixed to the housing.

Preferably, the central part includes an inner ring part formed by extending inward from the inner edge of the ring part and a reinforcement part compounded on the inner ring part, and the voice coil is connected to the reinforcement part The upper compound position with the inner ring part.

Preferably, the vibration system further includes a damper, one end of the damper is connected to the diaphragm, and the other end of the damper is connected to the casing.

The present invention also proposes an electronic device, which includes a housing and the above-mentioned sound-generating device for the electronic device accommodated in the housing.

Compared with the magnetic circuit design of the existing sounding device, the sounding device of the present invention sets the magnetization directions of the central magnet and the side magnets as the circumferential direction, so that the magnetic induction lines are distributed along the circumferential direction, and the magnetic flux density in the magnetic gap is improved and uniformity, so that the overall voice coil can be located in the area where the magnetic induction lines are dense, increasing the driving force factor BL, and by adjusting the magnetization center of the central magnet and the side magnet, the symmetry of the BL curve can be improved, effectively reducing the The distortion of the sound-generating device, especially the low-frequency distortion, is eliminated, and the sound quality of the sound-generating device is improved without increasing the size of the sound-generating device. In addition, the sound emitting device of the present invention also omits the edge washer structure in the traditional magnetic circuit design, which reduces the BOM quantity of the product, thereby reducing the production cost.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is an exploded schematic diagram of a sounding device according to an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of a sound emitting device according to an embodiment of the present invention;

Fig. 3 is a simulation comparison diagram of the BL curve of the side magnet in the sound-generating device adopting the magnetization method along the circumferential direction and the parallel magnetization method;

Fig. 4 is a distribution diagram of magnetic induction lines of a sounding device according to an embodiment of the present invention;

Fig. 5 is an exploded schematic view of omitted parts of the structure of the sound-generating device according to another embodiment of the present invention;

Fig. 6 is a schematic cross-sectional view of an omitted part of the structure of the sound emitting device according to another embodiment of the present invention;

Fig. 7 is a distribution diagram of magnetic induction lines of a sound-generating device according to another embodiment of the present invention;

Fig. 8 is an exploded schematic view of omitted parts of the structure of the sound generating device according to another embodiment of the present invention;

Fig. 9 is a schematic cross-sectional view of an omitted part of the structure of the sound-generating device in another embodiment of the present invention;

Fig. 10 is a distribution diagram of magnetic induction lines of a sound-generating device according to another embodiment of the present invention.

Explanation of reference numbers:

标号label	名称 name	标号label		名称name
100100	发声器件Sound device	23twenty three	定心支片 Centering piece
1010	壳体 case	3030	磁路系统 Magnetic system
2020	振动系统 vibration system	3131	磁轭Yoke
21twenty one	振膜 Diaphragm	3232	磁间隙 magnetic gap
211211	中央部 central part	3333	中央磁铁 central magnet
21112111	内环部 Inner Ring	331331	长边The long side
21122112	补强部 Reinforcement Department	332332	短边 Short side
212212	折环部 Surround	3434	边磁铁 side magnet
213213	固定部 fixed part	3535	中央华司Central washer
22twenty two	音圈voice coil	the	the

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The present invention proposes a sound emitting device 100 .

The sound generating device 100 is used in an electronic device, and the sound generating device 100 may be a speaker. As shown in Figures 1-2, Figures 5-6 and Figures 8-9, in one embodiment, the sound generating device 100 includes a housing 10, a vibration system 20 and a magnetic circuit system 30, and the vibration system 20 includes a diaphragm 21 and the voice coil 22 that drives the diaphragm 21 to vibrate in the first direction; the magnetic circuit system 30 includes a yoke 31, a central magnetic circuit structure and a side magnetic circuit structure arranged on the yoke 31, the central magnetic circuit structure and the side magnetic circuit A magnetic gap 32 is formed between the structures, and the voice coil 22 is set corresponding to the magnetic gap 32; the central magnetic circuit structure includes a central magnet 33, and the side magnetic circuit structure includes a side magnet 34, and the side magnet 34 is arranged on the outer peripheral side of the central magnet 33, and the central magnet 33 and the side magnets 34 are magnetized along the circumferential direction, at least a part of the magnetic field lines in the side magnets 34 extend toward the direction close to the magnetic gap 32, and at least part of the magnetic field lines in the central magnet 33 extend toward the direction close to the magnetic gap 32, and The magnetic field lines extending toward the magnetic gap 32 in the side magnet 34 and the magnetic field lines extending toward the magnetic gap 32 in the central magnet 33 are formed to close the magnetic field lines to pass through the voice coil in a direction perpendicular to the first direction. twenty two.

As shown in Fig. 1-Fig. 2, Fig. 5-Fig. 6 and Fig. 8-Fig. 9, the side magnetic circuit structure surrounds the outer peripheral side of the central magnetic circuit structure and forms a magnetic gap 32, and the voice coil 22 is set corresponding to the magnetic gap 32, Specifically, the voice coil 22 can be suspended in the magnetic gap 32 or suspended above the magnetic gap 32 . The magnetic gap 32 between the side magnetic circuit structure and the central magnetic circuit structure generates a magnetic field, and the voice coil 22 performs a reciprocating cutting magnetic induction line movement at the magnetic gap 32, driving the diaphragm 21 to vibrate in the first direction, thereby instigating the air to produce sound, and completing Energy conversion between electroacoustics. In one embodiment, the first direction is the up-down direction as shown in FIGS. 1-2 , 5-6 , and 8-9 , and the up-down direction is the vertical direction.

In one embodiment, the central magnetic circuit structure includes a central magnet 33, and the side magnetic circuit structure includes a side magnet 34. Both the central magnet 33 and the side magnet 34 are magnetized along the circumferential direction, and at least a part of the magnetic field lines in the side magnet 34 are directed towards The direction of the magnetic gap 32 extends, and at least a part of the magnetic field lines in the central magnet 33 also extend toward the direction close to the magnetic gap, and the magnetic field lines in the side magnet 34 extend toward the direction close to the magnetic gap 32 and the magnetic field lines in the central magnet 33 toward the magnetic field. The magnetic lines extending in the direction of the gap 32 are formed to close the magnetic lines to pass through the voice coil 22 in a direction perpendicular to the first direction. Understandably, as shown in Fig. 2, Fig. 6 and Fig. 9, the central magnet 33 is magnetized along the circumferential direction, and its magnetic induction lines are distributed along the circumferential direction, and the side magnets 34 are magnetized along the circumferential direction, and their magnetic induction lines are also along the circumferential direction. Direction distribution, the dotted arrows in Fig. 2, Fig. 6 and Fig. 9 indicate the direction of magnetization.

As shown in Fig. 4, Fig. 7 and Fig. 10, the magnetic field line of side magnet 34 extends toward the direction close to magnetic gap 32, and the magnetic field line in central magnet 33 also extends toward the direction near magnetic gap 32, side magnet 34 and The magnetic flux lines of both central magnets 33 extending toward the direction close to the magnetic gap 32 can form closed magnetic flux lines, and the closed magnetic flux lines can pass through the voice coil 22 in a direction perpendicular to the first direction, understandably, perpendicular to The direction of the first direction is the horizontal direction, and the closed magnetic induction line can pass through the voice coil 22 in the horizontal direction, so as to cut the magnetic induction line when the voice coil 22 reciprocates up and down. The yoke 31 has magnetic permeability and can be made of materials such as SPCC or silicon steel, and can correct the direction of the magnetic field lines of the central magnet 33 and the side magnets 34 .

As shown in FIG. 3 , FIG. 3 is a simulation comparison diagram of the BL curves of the side magnet 34 in the sound-generating device 100 adopting a circumferential direction magnetization method and a parallel magnetization method. In FIG. 3 , the solid line represents the BL curve using the circumferential magnetization method, the dotted line represents the BL curve using the parallel magnetization method, the abscissa represents the vibration displacement of the voice coil 22, and the ordinate represents the BL value. Compared with the parallel magnetization method, the BL curve value of the circumferential magnetization method is larger and more symmetrical. In Fig. 4, Fig. 7 and Fig. 10, the black lines represent the lines of magnetic induction, and the arrows represent the direction of magnetization. Similarly, when the central magnet 33 is magnetized in the circumferential direction rather than in parallel, the value of the BL curve is larger and more symmetrical.

Compared with the magnetic circuit design of the existing sounding device 100, the sounding device 100 of the present invention sets the magnetization direction of the central magnet 33 and the side magnet 34 as the circumferential direction, so that the magnetic induction lines are distributed along the circumferential direction, as shown in Figure 4 and Fig. 7 and FIG. 10, the magnetic flux density and uniformity in the magnetic gap 32 are improved, so that the voice coil 22 as a whole can be located in the area where the magnetic lines of induction are dense, and the driving force factor BL is increased. Moreover, by adjusting the central magnet 33 And the magnetization center of the side magnet 34 can improve the symmetry of the BL curve, effectively reduce the distortion of the sounding device 100, especially the low-frequency distortion, and improve the sound quality of the sounding device 100 without increasing the overall size of the sounding device 100 . In addition, since the central magnet 33 and the side magnets 34 are all magnetized along the circumferential direction, the magnetic field lines formed in the central magnet 33 and the side magnets 34 can all extend towards the direction close to the magnetic gap, so the sound generating device 100 of the present invention is also The edge washer structure in the traditional magnetic circuit design can be omitted, which can make the structure of the magnetic circuit system simpler, reduce the number of product BOMs, and further reduce production costs.

It should be noted that in the sound emitting device 100 of the present invention, the central magnet 33 and the side magnet 34 are both arranged to be magnetized along the circumferential direction, which is different from the way that one of the central magnet 33 and the side magnet 34 is set to be magnetized along the circumferential direction. Magnetization mode, and the other is set to parallel magnetization mode, or both are set to parallel magnetization mode, the side magnet 34 in the sounding device of the present invention extends towards the direction close to the magnetic gap 32 The magnetic flux lines in the central magnet 33 are more likely to form closed magnetic flux lines with the magnetic flux lines extending toward the magnetic gap 32 in the central magnet 33 , and the magnetic flux density and uniformity in the magnetic gap 32 are improved.

Further, the distribution plane of the magnetic induction lines formed by the central magnet 33 magnetized along the circumferential direction and the distribution plane of the magnetic induction lines formed by the side magnet 34 magnetized along the circumferential direction are all parallel to the first direction, as shown in Fig. 4, Fig. 7 and As shown in FIG. 10 , the distribution planes of the magnetic induction lines of the central magnet 33 and the distribution planes of the magnetic induction lines of the side magnets 34 are all arranged vertically, parallel to the first direction, so as to improve the cutting magnetic induction when the voice coil 22 reciprocates up and down. The effectiveness and reliability of the wire further improves the sound quality of the sound generating device 100.

The side magnetic circuit structure includes a plurality of side magnets 34, each side magnet 34 is in a bar shape and is magnetized along the circumferential direction, and the plurality of side magnets 34 are symmetrically arranged in pairs on the outer peripheral side of the central magnet 33, and the voice coil 22 is arranged along the outer circumference of the central magnet 33. It extends in one direction and is suspended in the magnetic gap 32 .

In one embodiment, the central magnet 33 includes magnetized areas with different magnetized directions, the number of magnetized areas is consistent with the number of side magnets 34 and corresponds one to one, and the magnetized direction of each magnetized area is the same as that of the corresponding side magnets. The magnetization direction of 34 corresponds to form a closed magnetic induction line passing through the voice coil 22 in a direction perpendicular to the first direction. As shown in Fig. 1 and Fig. 2, the quantity of side magnet 34 can be four, and four side magnets 34 surround the outer peripheral side of central magnet 33, and at this moment, central magnet 34 is provided with four magnetized regions, and four magnetized areas The magnetic regions correspond one-to-one to the four side magnets 34, and the magnetization direction of each magnetization region corresponds to the magnetization direction of the corresponding side magnets 34 to form a closed loop that passes through the voice coil 22 in a direction perpendicular to the first direction. The magnetic field lines, that is, the magnetic field lines of the correspondingly arranged magnetized regions and the magnetic field lines of the side magnet 34 can form closed magnetic field lines, and the closed magnetic field lines can pass through the voice coil 22 in the horizontal direction, When the voice coil 22 reciprocates up and down, the lines of magnetic induction are cut. Understandably, as shown in FIGS. 5 and 6 , when the number of side magnets 34 is two, the central magnet 34 is provided with two magnetized areas, and the two magnetized areas correspond to the two side magnets 34 one-to-one. , and the magnetization direction of each magnetic region corresponds to the magnetization direction of the corresponding side magnet 34 to form a closed magnetic induction line passing through the voice coil 22 in a direction perpendicular to the first direction; as shown in Figures 8 and 9 , when the side magnet 34 is an integral annular structure, the magnetized area of the central magnet 33 can also be an annular area matching the side magnet 34, and a closed magnetic induction line can be formed between the magnetic induction lines of the two.

As shown in Fig. 1 and Fig. 2, in one embodiment, the quantity of side magnet 34 is four, and four side magnets 34 surround the outer peripheral side of central magnet 33, and each side magnet 34 is bar-shaped structure, that is, Each side magnet 34 is a bar-shaped side magnet 34 . A magnetic gap 32 is formed between each side magnet 34 and the central magnet 33 , and the voice coil 22 extends vertically and is suspended in the magnetic gap 32 , so that the voice coil 22 can reciprocate and cut the magnetic field lines in the magnetic gap 32 . As shown in FIG. 4 , in this embodiment, the magnets 34 on each side are magnetized along the circumferential direction, which greatly increases the magnetic flux density and uniformity in the magnetic gap 32 , and further improves the sound quality of the sound-generating device 100 .

In this embodiment, the central magnet 33 has a rectangular structure, and the central magnet 33 includes two opposite long sides 331 and two opposite short sides 332; each long side 331 and each short side 332 are correspondingly provided with a side magnet34. That is, the four side magnets 34 are arranged in one-to-one correspondence with the four sides of the central magnet 33 , that is, the two long sides 331 and the two short sides 332 , so as to improve the magnetic flux density and uniformity in the magnetic gap 32 in all directions.

As shown in Fig. 5 and Fig. 6, in another embodiment, the quantity of side magnet 34 is two, and central magnet 33 is rectangular structure, and central magnet 33 comprises two long sides 331 that are arranged oppositely and two that are arranged oppositely. The short side 332 and each long side 331 are correspondingly provided with a side magnet 34 , that is, the two side magnets 34 are arranged in one-to-one correspondence with the two long sides 331 of the central magnet 33 . The magnets 34 on each side are bar-shaped, that is, the magnets 34 on each side are bar-shaped side magnets 34 . A magnetic gap 32 is formed between each side magnet 34 and the central magnet 33 , and the voice coil 22 extends vertically and is suspended in the magnetic gap 32 , so that the voice coil 22 can reciprocate and cut the magnetic field lines in the magnetic gap 32 . As shown in FIG. 7 , in this embodiment, the magnets 34 on each side are magnetized along the circumferential direction to increase the magnetic flux density and uniformity in the magnetic gap 32 and further improve the sound quality of the sound-generating device 100 . Moreover, the design of the two side magnets 34 can simplify the structure of the magnetic circuit system 30 in the sound generating device and reduce the BOM quantity of the product.

As shown in Figures 8 and 9, in yet another embodiment, the side magnet 34 has an integral annular structure, the side magnet 34 is surrounded by the outer peripheral side of the central magnet 33, and the central magnet 33 and the side magnet 34 are surrounded by a The annular magnetic gap 32 , the voice coil 22 is in a flat structure and is arranged above the magnetic gap 32 . As shown in FIG. 8 and FIG. 9 , the voice coil 22 has a flat structure, so that the vertical height of the voice coil 22 is not large, and the occupied volume is reduced. The magnetic gap 32 is arranged in a ring shape, and the voice coil 22 is located above the magnetic gap 32 and corresponding to the magnetic gap 32 . The voice coil 22 can reciprocate and cut the magnetic field lines at the magnetic gap 32 during the process. As shown in FIG. 10 , in this embodiment, the side magnets 34 are magnetized along the circumferential direction to increase the magnetic flux density and uniformity in the magnetic gap 32 and further improve the sound quality of the sound-generating device 100 .

In one embodiment, the central magnetic circuit structure further includes a central washer 35 , and the central washer 35 is disposed on a side of the central magnet 33 away from the yoke 31 . As shown in Figure 1, Figure 2, Figure 5 and Figure 6, the yoke 31 is located on the lower side of the central magnet 33, and the central washer 35 is installed on the upper side of the central magnet 33. The central washer 35 has magnetic permeability and can be used Made of materials such as SPCC or silicon steel. By arranging the central washer 35 on the upper side of the central magnet 33, the direction of the magnetic field lines of the central magnet 33 and the side magnets 34 can be further corrected, the magnetic flux density and uniformity in the magnetic gap 32 can be increased, and the sound quality of the sound generating device 100 can be improved.

In one embodiment, the side of the side magnet 34 facing away from the yoke 31 is flush with the side of the central washer 35 facing away from the central magnet 33 . As shown in Figure 2 and Figure 6, the upper side of the side magnet 34 is flush with the upper side of the central washer 35, and the height of the side magnet 34 is equal to the sum of the heights of the central magnet 33 and the central washer 35. The height of the gap 32 is maximized, which is beneficial to increase the magnetic flux density and uniformity in the magnetic gap 32 .

In one embodiment, the vibrating membrane 21 includes a central part 211 , a ring part 212 and a fixed part 213 arranged sequentially from inside to outside. The central part 211 is connected to the voice coil 22 , and the fixed part 213 is fixed to the housing 10 . As shown in Figures 1 and 2, the diaphragm 21 is connected to the upper side of the voice coil 22, specifically, the central part 211 of the diaphragm 21 is connected to the voice coil 22, and the fixed part 213 is fixed to the housing 10 to realize the voice coil 22. Assembly of the diaphragm 21 and the casing 10 .

Further, the central part 211 includes an inner ring part 2111 extending inwardly from the inner edge of the ring part 212 and a reinforcement part 2112 compounded on the inner ring part 2111. The voice coil 22 is connected to the reinforcement part 2112 and the inner ring part 2112. The position where the ring portion 2111 is compounded. Specifically, the inner ring part 2111 is annularly connected to the inner edge of the ring part 212, and the reinforcement part 2112 has a rectangular structure to block the blank space of the inner ring part 2111, and the surrounding edges of the reinforcement part 2112 are bonded to the inner edge. On the ring part 2111, a composite structure is formed, and the voice coil 22 is arranged on the reinforcement part 2112 at the composite position with the inner ring part 2111, so as to improve the vibration synchronization between the inner ring part 2111 and the reinforcement part 2112 and optimize the acoustic performance of the product.

As shown in Figures 1 and 2, in one embodiment, the vibration system 20 further includes a damper 23, one end of the damper 23 is connected to the diaphragm 21, and the other end of the damper 23 is connected to the housing 10 connections. The centering strut 23 is set so that when the voice coil 22 drives the diaphragm 21 to vibrate, the centering strut 23 connected to the diaphragm 21 vibrates synchronously, and the centering strut 23 plays a centering role, effectively increasing the vibration of the vibration system 20. Anti-polarization performance, thereby improving the acoustic performance of the product.

The present invention also proposes an electronic device, which includes a casing and the above-mentioned sound emitting device 100 for the electronic device accommodated in the casing. In an embodiment, the electronic device can be an earphone, a speaker, or a wearable device. The specific structure of the sound-generating device 100 in the electronic device refers to the above-mentioned embodiments. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments. Let me repeat them one by one.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly/indirectly used in other All relevant technical fields are included in the patent protection scope of the present invention.

Claims

A sound-generating device for an electronic device, comprising a housing, a vibration system, and a magnetic circuit system, the vibration system including a diaphragm and a voice coil that drives the diaphragm to vibrate in a first direction; the magnetic circuit system includes a magnetic A yoke, a central magnetic circuit structure and a side magnetic circuit structure arranged on the yoke, a magnetic gap is formed between the central magnetic circuit structure and the side magnetic circuit structure, and the voice coil is arranged corresponding to the magnetic gap; It is characterized in that,

The central magnetic circuit structure includes a central magnet, the side magnetic circuit structure includes a side magnet, and the side magnet is arranged on the outer peripheral side of the central magnet, and both the central magnet and the side magnet are magnetized along the circumferential direction, At least a part of the magnetic field lines in the side magnets extend toward the direction close to the magnetic gap, at least part of the magnetic field lines in the central magnet extend toward the direction close to the magnetic gap, and the inner side magnets face toward the direction close to the magnetic gap. The magnetic flux extending in the direction of the magnetic gap and the magnetic flux extending in the direction of the magnetic gap in the central magnet are formed to close the magnetic flux to pass through the sound in a direction perpendicular to the first direction. lock up.
The sound-generating device for an electronic device according to claim 1, wherein the central magnet includes magnetized areas with different magnetized directions, and the number of the magnetized areas is the same as the number of the side magnets. One-to-one correspondence, the magnetization direction of each magnetization region corresponds to the magnetization direction of the corresponding side magnet to form a closed magnetic induction line passing through the voice coil in a direction perpendicular to the first direction.
The sound-generating device for an electronic device according to claim 1, characterized in that, the distribution plane of the magnetic field lines formed by the central magnet magnetized along the circumferential direction and the magnetic field lines formed by the magnetic field lines formed by the side magnets magnetized along the circumferential direction The distribution planes are all parallel to the first direction.
The sound-generating device for an electronic device according to claim 1, wherein the side magnetic circuit structure includes a plurality of side magnets, and each of the side magnets has a strip structure and is magnetized along the circumferential direction A plurality of side magnets are symmetrically arranged in pairs on the outer peripheral side of the central magnet, and the voice coil extends along the first direction and is suspended in the magnetic gap.
The sound-generating device for an electronic device according to claim 4, wherein the central magnet has a rectangular structure, and the central magnet includes two opposite long sides and two opposite short sides;

Each of the long sides is correspondingly provided with one of the side magnets; or,

Each of the long sides and each of the short sides is correspondingly provided with one side magnet.
The sound-generating device for an electronic device according to claim 1, wherein the side magnet has an integral annular structure, and the side magnet is surrounded by the outer periphery of the central magnet, and the central magnet is connected to the The ring-shaped magnetic gap is formed between the side magnets, and the voice coil has a flat structure and is arranged above the magnetic gap.
The sound-generating device for an electronic device according to claim 1, wherein the central magnetic circuit structure further comprises a central washer, and the central washer is arranged on the side of the central magnet away from the yoke .
The sound emitting device for an electronic device according to claim 7, wherein the side of the side magnet facing away from the yoke is flush with the side of the central washer facing away from the central magnet.
The sound-generating device for an electronic device according to any one of claims 1-8, wherein the diaphragm includes a central part, a ring part and a fixed part arranged sequentially from the inside to the outside, and the central part connected to the voice coil, and the fixing part is fixed to the housing;

And/or, the vibration system further includes a damper, one end of the damper is connected to the diaphragm, and the other end of the damper is connected to the housing.
An electronic device, characterized in that the electronic device comprises a housing and the sound emitting device for the electronic device according to any one of claims 1-9 accommodated in the housing.