WO2021119995A1

WO2021119995A1 - Sound generating device

Info

Publication number: WO2021119995A1
Application number: PCT/CN2019/125950
Authority: WO
Inventors: 肖波; 令狐荣林
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: 2019-12-17
Filing date: 2019-12-17
Publication date: 2021-06-24

Abstract

Provided in the present application are a sound generating device, which comprises a basin frame, a vibration system, and a magnetic circuit system provided with a magnetic gap. The vibration system comprises a diaphragm that is fixed on the basin frame, a voice coil that is fixed on the diaphragm and is inserted into the magnetic gap, and two elastic support assemblies that are each fixed on the basin frame; the magnetic circuit system comprises a magnetic yoke that is fixed on the basin frame, main magnetic steel that is fixed on the magnetic yoke and two pieces of first auxiliary magnetic steel that are each spaced apart from the main magnetic steel to form the magnetic gap; each elastic support assembly comprises an auxiliary diaphragm and a reinforcing member, one side of each auxiliary diaphragm is connected to a side of the basin frame away from the diaphragm, the other side is connected to a side of the voice coil away from the diaphragm, the auxiliary diaphragms are each provided with a first avoidance hole that penetrates therethrough, and the reinforcing members are attached to the auxiliary diaphragms; the two pieces of first auxiliary magnetic steel pass through two first avoidance holes and are fixed to the magnetic yoke, and the two pieces of first auxiliary magnetic steel are each separated from the auxiliary diaphragm. Compared to the existing technology, the sound generating device of the present application has good reliability and excellent acoustic performance.

Description

Sound device

Technical field

The utility model relates to the field of sound and electricity, in particular to a sound emitting device used in portable electronic products.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and most portable mobile terminal devices. Sound-producing devices used to play sounds are widely used in current smart mobile devices such as mobile phones. The vibration system and magnetic circuit system used in the sound device directly affect the sound quality of the sound device.

The vibration system of the related art sound device includes a diaphragm for vibrating and sounding fixed on the frame, a voice coil attached to the diaphragm, and a voice coil fixed on the frame and supported on the end of the voice coil away from the diaphragm for strengthening the voice coil. Two elastic support components with lateral stability; the magnetic circuit system includes a yoke fixed to the basin frame, a main magnet fixed to the yoke, and a magnetic gap formed on opposite sides of the main magnet and separated from the main magnet. Two auxiliary magnets; each elastic support component is provided with a relief hole passing through it along the vibration direction of the diaphragm, and each first auxiliary magnet is respectively penetrated with each self-corresponding relief hole and fixed with the yoke .

technical problem

However, in the related art, the overall rigidity of the elastic support assembly is reduced due to the arrangement of the relief hole, which reduces the reliability of the vibration system, limits the vibration performance of the vibration system, and thus limits the optimization of the acoustic performance of the sound generating device.

Therefore, it is necessary to provide a new sound generating device to solve the above technical problems.

Technical solutions

The purpose of the utility model is to provide a sound device with high reliability and excellent acoustic performance.

In order to achieve the above objective, the present invention provides a sounding device, which includes a basin frame, a vibration system fixed to the basin frame and a magnetic circuit system with a magnetic gap, and the vibration system includes a frame fixed to the basin frame. A diaphragm, a voice coil inserted in the magnetic gap and driving the diaphragm to vibrate and produce sound, and two elastic support components respectively fixed on opposite sides of the basin frame; the magnetic circuit system includes a voice coil fixed to the basin The magnetic yoke of the frame, the main magnetic steel fixed to the magnetic yoke, and two first secondary magnetic steels respectively located on opposite sides of the main magnetic steel and separated from the main magnetic steel to form the magnetic gap; The elastic support assembly includes:

Auxiliary diaphragm, one side of the auxiliary diaphragm is connected to the side of the basin frame away from the diaphragm, and the other side is connected to the side of the voice coil away from the diaphragm, and the auxiliary diaphragm Provided with a first relief hole penetrating the diaphragm along the vibration direction thereof; and,

Reinforcement, the reinforcement is attached to the auxiliary diaphragm and located on opposite sides of the first relief hole;

The two first auxiliary magnets are respectively penetrated through the two first relief holes and are fixed to the magnetic yoke, and the two first auxiliary magnets are spaced apart from the auxiliary diaphragm respectively.

Preferably, each of the auxiliary diaphragms includes a folded ring portion, and a first connecting portion and a second connecting portion respectively bent and extended from opposite sides of the folded ring portion, and the first connecting portion is connected to the The side of the basin frame away from the diaphragm, the second connecting portion is connected to the side of the voice coil away from the diaphragm; the first relief hole is provided through the folding ring portion; the reinforcing member is attached Fitted to the folding ring part, and the shape of the reinforcing member matches with the folding ring part.

Preferably, the folding ring portion includes a first section and two second sections respectively bent and extended from opposite sides of the first section in a direction close to the voice coil, and the first relief hole penetrates The first section is arranged, and the connection between the two second sections and the first section is in a circular arc angle structure; the reinforcing member includes four and is arranged at intervals, wherein two of the reinforcing members are respectively It is attached to the positions of the two arc-angle structures of one of the folding ring portions, and the other two reinforcement members are attached to the positions of the two-arc-angle structure of the other folding ring portion, respectively.

Preferably, the auxiliary diaphragm and the reinforcing member are integrally formed.

Preferably, the elastic support assembly further includes two elastic members respectively attached to the side of the two auxiliary diaphragms close to the diaphragm; each of the elastic members includes fixed to the basin frame away from the A first fixed arm on one side of the diaphragm, a second fixed arm fixed on the side of the voice coil away from the diaphragm and spaced apart from the first fixed arm, and connected to the first fixed arm and the first fixed arm. Two fixed arms two elastic arms, the two elastic arms are spaced apart from each other; the first connecting portion is connected to the basin frame by the first fixed arm, and the second connecting portion is connected by the second fixed arm Connected to the voice coil, the two elastic arms are respectively arranged opposite to the folding ring portion, and the two elastic arms are respectively arranged at intervals from the first auxiliary magnetic steel.

Preferably, the folding ring portion protrudes in a direction approaching the yoke along the vibration direction of the diaphragm, and the reinforcing member is attached to the side of the folding ring portion away from the diaphragm; the magnetic The yoke is recessed to form a relief groove, and the relief groove is arranged opposite to the reinforcing member.

Preferably, the magnetic circuit system further includes two second auxiliary magnets arranged at intervals on the other opposite sides of the main magnet, the main magnet, the first auxiliary magnet, and the second auxiliary magnet. The magnetic steels together form the magnetic gap.

Preferably, the main magnet is rectangular, the two first auxiliary magnets are respectively located on opposite sides of the short axis of the main magnet, and the two elastic support components are respectively located on the short axis of the main magnet. On opposite sides of the shaft, the two second secondary magnets are respectively located on opposite sides of the long axis of the main magnet.

Beneficial effect

Compared with the related art, in the sound generating device of the present invention, each elastic support component includes an auxiliary diaphragm and a reinforcing member; one side of the auxiliary diaphragm is connected to the side of the basin frame away from the diaphragm, and the other side is connected to the sound The ring is away from the side of the diaphragm, and the auxiliary diaphragm is provided with a first relief hole passing through it along the vibration direction of the diaphragm; the reinforcing member is attached to the auxiliary diaphragm; the two first pairs of magnets are respectively penetrated in the two The first relief holes are fixed with the yoke, and the two first auxiliary magnetic steels are spaced apart from the auxiliary diaphragm; in the above structure, the auxiliary diaphragm is effectively increased by attaching the reinforcement on the auxiliary diaphragm The thickness of the auxiliary diaphragm increases the rigidity of the auxiliary diaphragm, so that the vibration reliability of the vibration system is high, and the acoustic performance of the sound device is optimized.

Description of the drawings

In order to more clearly explain the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some implementations of the present utility model. For example, for those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

Figure 1 is a schematic diagram of the three-dimensional structure of the sound generating device of the present invention;

Figure 2 is an exploded view of a part of the three-dimensional structure of the sound device of the present invention;

Figure 3 is an exploded view of the three-dimensional structure of the magnetic circuit system, the elastic support assembly and the basin frame of the sound device of the present invention;

Figure 4 is an exploded view of the three-dimensional structure of a part of the magnetic circuit system, the elastic support assembly and the basin frame of the sound device of the present invention from another angle;

Figure 5 is a cross-sectional view taken along line A-A in Figure 1;

Fig. 6 is a partial enlarged view of the part shown in B in Fig. 5.

Embodiments of the present invention

The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. Examples. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

Please refer to FIGS. 1-6. The present invention provides a sound generating device 100, which includes a basin frame 1, a vibration system 2 and a magnetic circuit system 3.

Specifically, the vibration system 2 is fixed to the basin frame 1, and includes a diaphragm 21 fixed to the basin frame 1, a voice coil 22 fixed to the diaphragm 21, and an end fixed to the basin frame 1 and connected to the voice coil 22 away from the diaphragm 21 The elastic support assembly 23.

In this embodiment, the elastic support assembly 23 is spaced apart from the magnetic circuit system 3 and includes an auxiliary diaphragm 231 and a reinforcing member 232 attached to the auxiliary diaphragm 231.

One side of the auxiliary diaphragm 231 is connected to the side of the frame 1 away from the diaphragm 21, and the other side is connected to the side of the voice coil 22 away from the diaphragm 21, and the auxiliary diaphragm 231 is provided to penetrate along the vibration direction of the diaphragm 21 The first escape hole 2310 on it.

Further, the auxiliary diaphragm 231 includes a folded ring portion 2311 with an arc-shaped cross section, and a first connecting portion 2312 and a second connecting portion 2313 respectively bent and extended from opposite sides of the folded ring portion 2311. The first connecting portion 2312 is connected to the side of the basin frame 1 away from the diaphragm 21, the second connecting portion 2313 is connected to the side of the voice coil 22 away from the diaphragm 21; the first relief hole 2310 is provided through the folding ring portion 2311.

Furthermore, the folding ring portion 2311 includes a first section 23111 and two second sections 23112 respectively bent and extended from opposite sides of the first section 23111 in a direction close to the voice coil 22; the first relief hole 2310 penetrates through the first section 23111. One section 23111 is provided, and the connection between the two second sections 23112 and the first section 23111 is in a circular arc structure.

The reinforcing member 232 is attached to the side of the auxiliary diaphragm 231 away from the diaphragm 21 and located on opposite sides of the first relief hole 2310; of course, the connection relationship between the reinforcing member and the auxiliary diaphragm is not limited to this, and the reinforcing member is attached to It is also feasible that the auxiliary diaphragm is close to the side of the diaphragm.

In this embodiment, the reinforcing member 232 is attached to the side of the folding ring portion 2311 away from the diaphragm 21; it is worth mentioning that the shape of the reinforcing member 232 matches the folding ring portion 2311.

Further, the number of reinforcing members 232 is not limited, and it can be specifically arranged according to the specific structure of the auxiliary diaphragm 231; for example, in this embodiment, the reinforcing members 232 include four and are arranged at intervals, two of which are The reinforcing members 232 are respectively attached to the positions of the two arc-angle structures of one of the folding ring portions 2311, and the other two reinforcing members 232 are respectively attached to the positions of the two arc-angle structures of the other folding ring portion 2311.

In the above structure, the reinforcement 232 is attached to the auxiliary diaphragm 231, which is beneficial to increase the thickness of the position of the arc angle structure of the auxiliary diaphragm 231, and effectively improves the overall rigidity of the auxiliary diaphragm 231, so that the elastic support assembly 23 The lateral (that is, the direction perpendicular to the vibration direction) swing of the vibration system 2 can be effectively suppressed, the reliability of the vibration of the vibration system 2 can be improved, and the acoustic performance of the sound generating device 100 can be optimized.

More preferably, in order to improve the fixing reliability of the auxiliary diaphragm 231 and the reinforcing member 232, the auxiliary diaphragm 231 and the reinforcing member 232 are integrally formed.

Furthermore, in order to make the elastic support assembly 23 better suppress the lateral swing of the vibration system 2, the elastic support assembly 23 further includes an elastic member 233.

In this embodiment, the elastic member 233 includes two, and the two elastic members 233 are respectively attached to the side of the two auxiliary diaphragms 231 close to the diaphragm 21; each elastic member 233 includes fixed to the basin frame 1 away from the diaphragm 21 The first fixed arm 2331 on one side is fixed to the voice coil 22 on the side away from the diaphragm 21 and is spaced from the first fixed arm 2331. The second fixed arm 2332 is connected to the first fixed arm 2331 and the second fixed arm 2332. Two elastic arms 2333, two elastic arms 2333 are spaced apart from each other and jointly enclose a second relief hole 2330; the first connecting portion 2312 is connected to the side of the basin frame 1 away from the diaphragm 21 through the first fixed arm 2331, and the second connecting The portion 2313 is connected to the side of the voice coil 22 away from the diaphragm 21 through the second fixed arm 2332, and the two elastic arms 2333 are respectively disposed opposite to the folding ring portion 2311.

Of course, the connection relationship between the elastic element and the auxiliary diaphragm is not limited to this. It is also feasible that the elastic element is attached to the side of the auxiliary diaphragm away from the diaphragm. In this case, the auxiliary diaphragm is directly connected to the frame and fixed.

In the above structure, the arrangement of the elastic member 233 further improves the overall rigidity of the elastic support assembly 23, and better suppresses the lateral swing, so that the reliability of the elastic support assembly 23 is higher.

More preferably, the elastic member 233 is a flexible circuit board, and the voice coil 22 and the elastic member 233 are electrically connected. On the one hand, it is used to improve the vibration intensity and balance of the vibration system 2 and suppress swings. On the other hand, the voice coil 22 is led out to connect to an external power source, which avoids the risk of the voice coil lead being easily broken when the voice coil lead structure leads to the power source.

The magnetic circuit system 3 is fixed to the frame 1 and forms a magnetic gap 30. The voice coil 22 is inserted into the magnetic gap 30 and drives the diaphragm 21 to vibrate and produce sound. The magnetic circuit system 3 includes a magnetic yoke 31 fixed to the basin frame 1, a main magnet 32 fixed to the magnetic yoke 31, and two second magnets fixed on opposite sides of the main magnet 32 and separated from the main magnet 32 to form a magnetic gap 30. A pair of magnets 33, and two first auxiliary magnets 33 are arranged on opposite sides of the main magnet 32 at intervals.

In this embodiment, an elastic support assembly 23 is provided on the same side of each first secondary magnet 33, and the first secondary magnet 33 and the elastic support assembly 23 on the same side are relatively spaced apart.

Specifically, the two first sub-magnets 33 are respectively penetrated through the two first relief holes 2310 and are fixed to the yoke 31, and the first sub-magnets 33 and the auxiliary diaphragm 231 are spaced apart from each other. In the case where the elastic support assembly 23 is provided with an elastic member 233, each first auxiliary magnet 33 passes through the second relief hole 2330 and the first relief hole 2310 on the same side in turn and is fixed to the yoke 31, and the second magnetic steel 33 is fixed to the yoke 31. A pair of magnetic steel 33 is spaced apart from the auxiliary diaphragm 231 and the two elastic arms 2333 on the same side.

It is worth mentioning that the protruding direction of the folded ring portion 2311 is not limited. For example, in this embodiment, the folded ring portion 2311 protrudes toward the yoke 31 along the vibration direction of the diaphragm, and the reinforcement 232 It is attached to the side of the folding ring portion 2311 away from the diaphragm 21; the yoke 31 is recessed to form a relief groove 310, and the relief groove 310 is arranged opposite to the reinforcing member 232; the arrangement of the relief groove 310 avoids vibration during vibration. , The acoustic performance and reliability of the sound emitting device 100 are affected due to the interference between the elastic support assembly 23 and the yoke 31.

More preferably, the magnetic circuit structure of the magnetic circuit system 3 is not limited. It can be a three-magnetic circuit structure or a five-magnetic circuit structure. The number of the elastic support assembly 23 and the first secondary magnet 33 is not limited. Yes, it can be specifically set according to the needs of the structure design of the magnetic circuit system 3. The following describes each magnetic circuit structure:

The first auxiliary magnet 33 and the elastic support assembly 23 respectively include two, and the main magnet 32 and the two first auxiliary magnets 33 together form a three-magnet circuit structure. Take the main magnet 32 as a rectangle as an example:

When the two first auxiliary magnets 33 are respectively located on both sides of the short axis of the main magnet 32, the two elastic support components 23 are respectively located on both sides of the short axis of the main magnet 32; when the two first auxiliary magnets 33 When they are respectively located on both sides of the long axis of the main magnet 32, the two elastic support components 23 are respectively located on both sides of the long axis of the main magnet 32.

In the above three magnetic circuit structure, the magnetic circuit performance of the magnetic circuit system 3 is strong, so that the acoustic performance of the sound generating device 100 is excellent.

Each of the first auxiliary magnet 33 and the elastic support assembly 23 includes two, and the magnetic circuit system 3 can also be additionally provided with two second auxiliary magnets 34 fixed to the yoke 31 and spaced apart on opposite sides of the main magnet 32 , The main magnet 32, the two first auxiliary magnets 33, and the two second auxiliary magnets 34 together form a five-magnetic circuit structure and jointly form a magnetic gap 30. Take the main magnet 32 as a rectangle as an example:

For example, in this embodiment, the two first secondary magnets 33 are respectively located on opposite sides of the minor axis of the main magnet 32, and the two elastic support components 23 are respectively located on opposite sides of the minor axis of the main magnet 32, and two The second auxiliary magnets 34 are respectively located on opposite sides of the long axis of the main magnet 32.

Of course, the two first secondary magnets 33 are respectively located on opposite sides of the long axis of the main magnet 32, the two elastic support components 23 are respectively located on opposite sides of the long axis of the main magnet 32, and the two second secondary magnets 34 are located on opposite sides of the long axis of the main magnet 32. It is also feasible to be located on opposite sides of the minor axis of the main magnet 32 respectively.

In the above-mentioned five magnetic circuit structure, the magnetic performance of the magnetic circuit system 3 is further enhanced, and the acoustic performance of the sound generating device 100 is further improved.

More preferably, in order to further improve the magnetic performance of the magnetic circuit system 3, the magnetic lines of force of the magnetic circuit system 3 are cut by the voice coil 22 as much as possible to form a greater driving force, and the magnetic circuit system 3 can also be provided with an overlay The splint of the sub-magnet (not marked in the picture).

In this embodiment, the magnetic circuit system 3 further includes two first clamping plates 35 stacked on the two first secondary magnets 33 and a second clamping plate 36 stacked on the second secondary magnets 34 respectively.

The first splint 35 is fixed to the side of the first sub-magnet 33 close to the diaphragm 21; the second splint 36 includes a ring-shaped fixing ring 361 fixed to the basin frame 1 and the fixing ring 361 is connected to the second sub-magnet respectively. 34 extends two secondary pole cores 362, and the two secondary pole cores 362 are respectively stacked on the two second secondary magnetic steels 34.

Further, the ring-shaped second clamping plate 36 and the first clamping plate 35 are integrally formed, and the integrally formed structure enables the first clamping plate 35 and the second clamping plate 36 to be superimposed on the first secondary magnet 33 and the second secondary magnet respectively. 34 is more reliable.

In the above structure, through the arrangement of the first clamping plate 35 and the second clamping plate 36, the magnetic lines of force of the magnetic circuit system 3 are more concentrated, so that the magnetic performance of the magnetic circuit system 3 is better, and the acoustic performance of the sound generating device 100 is further improved. .

The above are only the embodiments of the present utility model. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these all belong to The scope of protection of the utility model.

Claims

A sounding device, comprising a basin frame, a vibration system fixed to the basin frame and a magnetic circuit system with a magnetic gap, the vibration system including a diaphragm fixed to the basin frame, inserted in the magnetic A voice coil that drives the diaphragm to vibrate and emit sound, and two elastic support components respectively fixed on opposite sides of the basin frame; the magnetic circuit system includes a magnetic yoke fixed to the basin frame, and The main magnet of the yoke and the two first auxiliary magnets respectively located on opposite sides of the main magnet and spaced from the main magnet to form the magnetic gap, characterized in that each of the elastic support components include:

Auxiliary diaphragm, one side of the auxiliary diaphragm is connected to the side of the basin frame away from the diaphragm, and the other side is connected to the side of the voice coil away from the diaphragm, and the auxiliary diaphragm Provided with a first relief hole penetrating the diaphragm along the vibration direction thereof; and,

Reinforcement, the reinforcement is attached to the auxiliary diaphragm and located on opposite sides of the first relief hole;

The two first auxiliary magnets are respectively penetrated through the two first relief holes and are fixed to the magnetic yoke, and the two first auxiliary magnets are spaced apart from the auxiliary diaphragm respectively.
The sounding device according to claim 1, wherein each of the auxiliary diaphragms includes a folded ring portion, and a first connecting portion and a second connecting portion respectively bent and extended from opposite sides of the folded ring portion The first connecting portion is connected to the side of the basin frame away from the diaphragm, and the second connecting portion is connected to the side of the voice coil away from the diaphragm; The folding ring portion is provided; the reinforcing member is attached to the folding ring portion, and the shape of the reinforcing member matches the folding ring portion.
The sounding device according to claim 2, wherein the folded ring portion includes a first section and two second sections bent and extended from opposite sides of the first section in a direction close to the voice coil. In the second section, the first relief hole is provided through the first section, and the connection between the two second sections and the first section is in a circular-arc angle structure; the reinforcing member includes four and is mutually connected. Are arranged at intervals, wherein two of the reinforcing members are respectively attached to the positions of the two arc corner structures of one of the folding ring portions, and the other two of the reinforcing members are respectively attached to the positions of the other folding ring portion The location of the two arc corner structures.
4. The sound emitting device according to claim 3, wherein the auxiliary diaphragm and the reinforcing member are integrally formed.
The sounding device according to claim 2, wherein the elastic support assembly further comprises two elastic members respectively attached to the two auxiliary diaphragms on one side close to the diaphragm; each of the elastic The components include a first fixed arm fixed on the side of the basin frame away from the diaphragm, a second fixed arm fixed on the side of the voice coil away from the diaphragm and spaced apart from the first fixed arm, and Two elastic arms connecting the first fixed arm and the second fixed arm, the two elastic arms are spaced apart from each other; the first connecting portion is connected to the basin frame through the first fixed arm, the The second connecting portion is connected to the voice coil through the second fixed arm, the two elastic arms are respectively arranged opposite to the folding ring portion, and the two elastic arms are respectively connected to the first auxiliary magnet Interval settings.
The sounding device according to claim 2, wherein the folding ring portion protrudes in a direction approaching the yoke along the vibration direction of the diaphragm, and the reinforcing member is attached to the folding ring portion One side away from the diaphragm; the yoke is recessed to form a relief groove, and the relief groove is arranged opposite to the reinforcing member.
The sounding device according to any one of claims 1-6, wherein the magnetic circuit system further comprises two second auxiliary magnets arranged at intervals on the other opposite sides of the main magnet, and the main magnet The magnetic steel, the first secondary magnetic steel and the second secondary magnetic steel jointly form the magnetic gap.
The sounding device according to claim 7, wherein the main magnet is rectangular, the two first auxiliary magnets are respectively located on opposite sides of the minor axis of the main magnet, and the two elastic The supporting components are respectively located on opposite sides of the short axis of the main magnet, and the two second auxiliary magnets are respectively located on opposite sides of the long axis of the main magnet.