CN115002623A

CN115002623A - Sound production vibrating device and electronic equipment

Info

Publication number: CN115002623A
Application number: CN202210468599.6A
Authority: CN
Inventors: 蔡晓东; 李波波; 刘松; 张成飞; 刘春发
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-09-02

Abstract

The invention belongs to the technical field of terminal equipment manufacturing, and particularly relates to a sound production vibration device and electronic equipment. According to the sound production vibration device, when the sound production vibration device realizes vibration and sound production, the whole thickness size of the vibration motor and the sound production unit in the vibration direction is effectively reduced, so that space is reserved for optimizing the sound production unit, the shell vibration problem of the sound production vibration device can be effectively relieved, and the user experience is improved.

Description

Sound production vibrating device and electronic equipment

Technical Field

The invention belongs to the technical field of terminal equipment manufacturing, and particularly relates to a sounding vibration device and electronic equipment.

Background

Along with the rapid development of intelligent wearable products, the demand of users for sound has risen to the demand for tone quality. The sound of the audio system is emitted by the most front acoustic transducer, and the quality of the acoustic device affects the sound quality of the whole audio system. Theoretically, the size of the low-frequency pushing capacity of the loudspeaker in the acoustic device is closely related to the maximum volume pushing amount pushed by the vibrating diaphragm of the loudspeaker, so that the maximum volume pushing amount is promoted, the design optimization and the application promotion of the miniature loudspeaker are the most mainstream directions, but when the maximum volume pushing amount of the loudspeaker is promoted, the vibration generated during sound production of the loudspeaker is correspondingly increased, and then the problem of shell vibration occurs at the end of the whole loudspeaker, so that the user experience is influenced.

On the other hand, the demand of the intelligent wearable product on the touch feedback device is gradually highlighted, however, the light weight development demand of the intelligent wearable product is contradictory to the large volumes of the acoustic device and the touch feedback device, and the existing acoustic and touch devices cannot simultaneously meet the design demand of the whole machine.

Disclosure of Invention

The invention aims to provide a sound-producing and vibrating device and electronic equipment, and at least solves the problems that the sound-producing and vibrating device integrated with a vibrating motor in the prior art is large in size and has shell vibration.

A first aspect of the present invention provides a sound-producing vibration device including:

a housing;

the vibration motor is arranged in the shell and comprises a driving system and a magnetic circuit system matched with the driving system, the driving system is fixed on the shell, the magnetic circuit system at least comprises a magnetic yoke protruding outwards, and the magnetic yoke is elastically connected with the shell;

the sounding unit is arranged in the shell and comprises a vibration system matched with the magnetic circuit system; the vibration system is elastically connected with the shell and has the same vibration direction with the magnetic circuit system;

the first limiting block is arranged between the magnet yoke and the shell and is positioned on one side, close to the vibration system, of the protruding part of the magnet yoke.

According to the sound-producing vibration device, the vibration motor and the sound-producing unit are arranged, and the vibration motor and the sound-producing unit share the magnetic circuit system, so that the whole thickness of the sound-producing vibration device in the vibration direction is effectively reduced while vibration and sound production are realized, the space is made for optimization of the sound-producing unit while the sound-producing and vibration performance of the sound-producing vibration device is ensured, and the tone quality of the sound-producing vibration device can be improved. Simultaneously, when the sound production unit during operation, because magnetic circuit and casing elastic connection receive vibration system's reaction force, consequently magnetic circuit can vibrate with the vibration direction synchronous vibration that the same vibration frequency is opposite with vibration system vibration under the effect of reaction force, and then offset sound production unit's vibration effect to a certain extent, and then reduce sound production vibrating device's shell and shake the problem, improve user experience. In addition, through setting up the spacing subassembly including first stopper, to the striking of casing when can cushioning the magnetic circuit vibration, improve sound production vibrating device's stability.

In addition, the sound-producing vibration device according to the present invention may have the following additional technical features:

in some embodiments of the present invention, the vibration system further includes a second stopper, and the second stopper is disposed between the yoke and the housing and located on a side of the yoke away from the vibration system.

In some embodiments of the present invention, the first stopper and the second stopper may be made of foam and/or a rubber material.

In some embodiments of the present invention, the thickness of the first stopper and/or the second stopper satisfies the following formula:

X _f *(1-σ)+X _max ≤X _p ，

wherein, X _f Is the thickness of the first limiting block or the second limiting block, sigma is the compression ratio of the first limiting block or the second limiting block, X _max For maximum displacement of the vibration motor in the direction of vibration, X _p Is a shell corresponding toAnd a reserved vibration space in the vibration direction.

In some embodiments of the present invention, the magnetic circuit system further includes a side magnet and a center magnet disposed on the yoke, the side magnet and the center magnet forming a magnetic gap therebetween; the vibration system comprises a voice coil inserted into the magnetic gap; the driving system comprises a driving coil which is fixed on the shell outside the side magnet.

In some embodiments of the present invention, a first extension portion extends inward from a sidewall of the housing, a first protrusion portion protrudes outward from an outer edge of the yoke, and the first stopper is disposed between the first extension portion and the first protrusion portion.

In some embodiments of the present invention, the first extension portions are located at both ends of the case, and the first protruding portions are located at both ends of the yoke; the number of the first limiting blocks is two, and the first limiting blocks are respectively arranged between the first extending parts and the first extending parts at two ends of the magnetic circuit system.

In some embodiments of the present invention, the number of the second limiting blocks is multiple, and the second limiting blocks are uniformly distributed on the bottom surface of the housing and are adapted to the lower surface of the magnetic yoke.

In some embodiments of the present invention, the magnetic circuit system further includes a first magnetic conductive plate and a second magnetic conductive plate, the first magnetic conductive plate is disposed on the upper surface of the central magnet, and the second magnetic conductive plates are disposed on the upper surfaces of the side magnets on both sides.

Another aspect of the present invention provides an electronic device having the sound-generating vibration device described in any one of the above.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of a sound-generating vibration device according to some embodiments of the present application;

FIG. 2 is an exploded view of the sound vibration device of FIG. 1;

FIG. 3 is a schematic front view of the sound vibration device of FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along line A-A in FIG. 3;

FIG. 5 is a schematic cross-sectional view of B-B in FIG. 3;

FIG. 6 is a schematic view in partial cutaway of FIG. 1;

fig. 7 is a schematic structural view of the magnetic circuit assembly and a part of the housing in fig. 1;

fig. 8 is a schematic structural view of a part of the housing;

FIG. 9 is a schematic view showing a connection structure of the elastic member of FIG. 2;

fig. 10 is a schematic mechanical diagram of the vibration system of fig. 2.

Description of reference numerals:

1: a sound-producing vibration device;

10: a sound emitting unit;

11: vibration system, 111: vibrating diaphragm, 1111: folded ring portion, 1112: inner fixing portion, 1113: outer fixing portion, 112: dome, 113-voice coil;

12: a centering support;

20: a vibration motor;

21: magnetic circuit system, 211: yoke, 2111: first protruding portion, 212: side magnet, 213: center magnet, 214: first magnetically permeable plate, 215: a second magnetic conductive plate;

22: a drive coil;

23: elastic member, 231: first connection portion, 232: second connection portion, 233: an elastic portion;

30: a housing;

31: cover plate, 32: middle shell, 321: injection molding housing, 3211: second extension, 322: connecting insert, 3221: first extension, 33: lower case, 331: boss, 332: flange, 34: first stopper, 35: second stopper, 36: a flexible printed circuit board.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. This spatially relative term is intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Because the electronic equipment is more and more intelligent and lightweight at present, consequently to the coupling have vibrating motor 20's sound production vibrating device 1, when guaranteeing sound production vibrating device 1's sound production quality and vibrating motor 20's vibration function, pay more attention to the promotion to tone quality to improve sound production vibrating device 1's performance. The first aspect of the present application provides a sound-generating vibration device 1, which is used in an electronic device to generate sound and vibrate the electronic device.

In some embodiments of the present application, in conjunction with fig. 1 to 10, the sound vibration device 1 includes a vibration motor 20 and a sound unit 10. The vibration motor 20 includes a drive system and a magnetic circuit system 21 cooperating with the drive system. The sound generating unit 10 comprises a vibration system 11 cooperating with a magnetic circuit system 21. Wherein the vibration motor 20 and the sound generating unit 10 share the same set of magnetic circuit system 21, and the vibration system 11 and the magnetic circuit system 21 vibrate in the same direction.

Specifically, as shown in fig. 4-5, the driving system is disposed outside the magnetic circuit system 21 and adapted to drive the magnetic circuit system 21 to vibrate up and down to realize the vibration function of the vibration motor 20; the vibration system 11 is stacked above the magnetic circuit system 21, and the vibration system 11 is driven by the magnetic circuit system 21 to vibrate to generate sound. Because of sharing magnetic circuit system 21 to make sound production vibrating device 1 when realizing vibration and sound production, reduced vibration motor 20 and sound production unit 10 whole thickness dimension in the vibration direction effectively, thereby reduce sound production vibrating device 1's whole thickness dimension, when having guaranteed sound production and the vibration function of sound production vibrating device 1, be convenient for optimize the generating unit in sound production vibrating device 1 in order to improve tone quality. In addition, when the sound generating unit 10 works, because the magnetic circuit system 21 is elastically connected with the shell 30 and is subjected to the reaction force of the vibration system 11, the magnetic circuit system 21 can synchronously vibrate with the vibration system 11 in the vibration direction opposite to the same vibration frequency under the action of the reaction force, so that the vibration effect of the sound generating unit 10 is counteracted to a certain extent, the shell vibration problem of the sound generating vibration device 1 is reduced, and the user experience is improved; further, the driving coil 22 can control the magnetic circuit system to vibrate in opposite directions, so as to counteract the vibration.

Specifically, as shown in fig. 4, 5 and 10, in some embodiments of the present application, the vibration system 11 includes a diaphragm 111, a dome 112 and a voice coil 113, the diaphragm 111 includes a corrugated portion 1111 and an inner fixing portion 1112, the dome 112 is fixed to the inner fixing portion 1112, and further, the dome 112 is connected to a surface of the inner fixing portion 1112 far from the magnetic circuit system 21. One end of the voice coil 113 is connected to the dome 112, and the other end of the voice coil 113 is inserted into the magnetic gap of the magnetic circuit system 21.

By inserting the bottom end of the voice coil 113 into the magnetic gap of the magnetic circuit system 21, when the voice coil 113 is energized, the voice coil 113 can vibrate up and down along its axis direction by the magnetic circuit system 21, and directly drive the ball top 112 to vibrate, thereby vibrating and generating sound.

As shown in fig. 4, 5, and 10, in some embodiments of the present application, the corrugated portion 1111 protrudes toward the magnetic path system 21. That is, the corrugated portion 1111 is protruded toward the inside of the sound-generating vibration device 1, so as to further reduce the outer thickness of the sound-generating vibration device 1, and the corrugated portion 1111 is hidden inside the sound-generating vibration device 1 and has a sufficient vibration space, so as to further reduce the entire thickness of the sound-generating vibration device 1.

Referring to fig. 2, 5, 6, and 7, in some embodiments of the present application, magnetic circuit system 21 includes a magnetic yoke 211, and a side magnet 212 and a center magnet 213 disposed on magnetic yoke 211, wherein a magnetic gap is formed between side magnet 212 and center magnet 213. The magnetizing directions of the side magnet 212 and the center magnet 213 are opposite, and are parallel to the vibration direction of the magnetic circuit system 21.

Specifically, in some embodiments of the present application, the first magnetic yoke 211 has a plate-shaped structure, and the side magnets 212 and the central magnet 213 are both connected to the upper surface of the magnetic yoke 211 by gluing, as shown in fig. 5 and 7. The side magnets 212 are disposed on both sides of the central magnet 213, and the single side magnet 212 is composed of two magnets, and the two sides of the magnet are arranged in two parallel rows to surround both sides of the central magnet 213, thereby forming a magnetic gap for inserting the voice coil 113.

In some embodiments of the present application, a first magnetic conductive plate 214 is further disposed on a surface of the central magnet 213 facing the vibration system 11, a second magnetic conductive plate 215 is further disposed on a surface of the outer magnet facing the vibration system 11, and magnetic gaps are formed between the first magnetic conductive plate 214, the central magnet 213, the second magnetic conductive plate 215, and the side magnets 212. The first magnetic plate 214 and the second magnetic plate 215 are respectively attached to the upper surfaces of the central magnet 213 and the side magnet 212, so as to respectively enhance the magnetic field intensity passing through the voice coil 113.

By inserting the end of the voice coil 113 into the magnetic gap formed by the first magnetic conductive plate 214, the center magnet 213, the second magnetic conductive plate 215, and the edge magnet 212, not only a balanced magnetic driving force can be obtained, but also a vibration space can be sufficiently utilized when the voice coil 113 vibrates.

In some embodiments of the present application, the driving system includes two driving coils 22, the two driving coils 22 are respectively disposed on two sides of the magnetic circuit system 21, specifically, the driving coils 22 are located in a magnetic field formed by the side magnet 212, when the driving coils 22 are powered on, an ampere force exists between the driving coils 22 and the side magnet 212, and the driving coils are driven by the ampere force to move relatively, and since the driving coils 22 are fixed to the housing, the side magnet 212 vibrates under a reaction, and then the magnetic circuit system 21 is driven to vibrate together, so as to implement a vibration function of the vibration motor 20.

Referring to fig. 2, 4, 5 and 6, in some embodiments of the present invention, the sound vibration device 1 further includes a housing 30, wherein the driving system is fixed to the housing 30, the magnetic circuit system 21 is elastically connected to the housing 30 through an elastic component, and the vibration system 11 is elastically connected to the housing 30.

In some embodiments of the present invention, the case 30 is a rectangular parallelepiped case structure including a cover plate 31, a middle case 32, and a lower case 33. The cover plate 31 is a rectangular ring structure, and a central opening opposite to the vibration system 11 is formed in the center of the cover plate. The middle shell 32 comprises injection molding outer shells 321 positioned at two ends and connecting inserts 322 which cross the long shaft and are arranged at two sides, and the injection molding outer shells 321 and the connecting inserts 322 are integrally injection molded to form the middle shell 32; a second extending portion 3211 extends inwards from an end of each injection-molded housing 321, so that the second extending portions 3211 are disposed at opposite corners of the middle shell 32, a first extending portion 3221 extends inwards from an end of the connecting insert 322, and the first extending portion 3221 is located between the two second extending portions 3211 at the same end. The upper surface of the middle shell is a plane, the injection molding shell of the middle shell is fixedly connected with the cover plate 31 through a fastener, the lower surface of the middle shell is special-shaped, and the middle shell is in fit welding with the groove-shaped lower shell through connecting inserts arranged on two sides. The cover plate 31, the middle case 32, and the lower case 33 collectively form a mounting vibration chamber of the vibration motor 20 and the sound emitting unit 10.

Further, in some embodiments of the present application, the outer edge of the diaphragm 111 is connected to the middle shell 32 by gluing, hot pressing or integral injection molding.

Referring to fig. 10, the diaphragm 111 further includes an outer fixing portion 1113, the outer fixing portion 1113 is disposed on an outer edge of the diaphragm 111 and connected to the corrugated portion 1111, the diaphragm 111 is connected to the upper surface of the middle shell 32 through the outer fixing portion 1113, and then the fixing portion is pressed by the cover plate 31 and the middle shell 32 to reinforce the connection.

In some embodiments of the present application, the vibrating diaphragm 111 is an integral injection molding, so that the overall strength of the vibrating diaphragm 111 can be effectively improved, the vibration effect can be ensured, and the vibrating diaphragm can be prevented from being separated from the dome 112 in the vibration process.

In some embodiments of the present application, the top end of the voice coil 113 is connected to the dome 112, and the bottom end of the voice coil 113 is connected to the middle shell 32 through the centering stem 12 assembly, so as to fix the two ends of the voice coil 113 and ensure that the voice coil 113 vibrates up and down in the magnetic gap. Specifically, the centering tab assembly includes four centering tabs 12, which are disposed along two opposite corners of the middle case 32 and connected to second extending portions 3211 formed by extending inward at the opposite corners of the middle case 32, respectively, so as to further ensure the supporting strength of the voice coil 113.

In some embodiments of the present application, the side wall of the major axis of the lower case 33 is provided with a protrusion 332, and the drive coil 22 is mounted and positioned by the protrusion 332, and the minor axis of the bottom wall is provided with a boss 331 adapted to be connected to the magnetic circuit system 21. The driving coil 22 is energized through a flexible printed circuit board 36 provided at the bottom of the lower case 33.

As shown in fig. 2 and 7, in some embodiments of the present application, the vibration motor 20 further includes an elastic member, and the yoke 211 is connected to the lower case 33 through the elastic member.

As shown in fig. 9, in some embodiments of the present application, the elastic member 23 includes an elastic portion 233, and a first connection portion 231 and a second connection portion 232 respectively connected to both ends of the elastic portion 233, the first connection portion 231 is connected to the yoke 211, and the second connection portion 232 is connected to the housing 30.

Specifically, the first connecting portion 231 is connected with the magnetic yoke 211 by welding, the second connecting portion 232 is clamped between the middle shell 32 and the lower shell 33, and the boss 331 arranged on the short axis side of the bottom wall of the specific lower shell 33 is matched with the bottom surface of the injection molding shell 321 to clamp the second connecting portion 232.

In some embodiments of the present application, the elastic portion 233 is a W-shaped member as shown in fig. 9, one end of the W-shaped member is extended outward to form the first connection portion 231, and the other end is extended outward to form the second connection portion 232.

Specifically, the elastic member 23 has a planar structure, which includes a W-shaped member and a first connection portion 231 and a second connection portion 232 connected to both ends of the W-shaped member, and is adapted to ensure a normal vibration process of the elastic member 23 through a deformability of the W-shaped member.

As shown in fig. 7, in some embodiments of the present application, the number of the elastic members 23 is four, and the four elastic members 23 are uniformly distributed at two ends of the housing 30, so as to further ensure the strength and stability of the elastic support for the magnetic circuit system 21.

In some embodiments of the present application, an elastic component is further provided, and a limiting component is provided between the magnetic circuit system 21 and the inner wall of the casing 30, and is adapted to limit the vibration range of the magnetic circuit system 21 in the vibration direction.

In some embodiments of the present application, the limiting assembly includes a first limiting block 34 disposed on the casing 30, the first limiting block 34 is located in one vibration direction of the magnetic circuit system 21 and is adapted to limit a vibration range in the direction; and/or, the limiting assembly comprises a second limiting block 35 arranged on the shell 30, and the second limiting block 35 is located in another vibration direction of the magnetic circuit system 21 and is suitable for limiting the vibration range in the direction.

Specifically, the first stopper 34 is located above the magnetic circuit system 21, and the second stopper 35 is located below the magnetic circuit system 21, and is adapted to respectively limit the vibration range of the magnetic circuit system 21 in the vibration direction.

Referring to fig. 4 and 6, in some embodiments of the present application, a first extending portion 3221 extends inward from a sidewall of the housing 30, a first protruding portion 2111 extends outward from an outer edge of the magnetic yoke 211, and the first stopper 34 is disposed between the first extending portion 3221 and an upper surface of the first protruding portion 2111.

In some embodiments of the present application, there are two first stoppers 34, and the two first stoppers 34 are respectively disposed at two ends of the housing 30 and correspond to the first extending portions 2111 between the two elastic members 23.

Referring to fig. 5 and 7, in some embodiments of the present application, the second stoppers 35 are multiple, and the multiple second stoppers 35 are uniformly disposed on the bottom surface of the housing 30 and are adapted to the lower surface of the yoke 211. Specifically, the number of the second limiting blocks 35 is four, four second limiting blocks 35 are arranged in a rectangular shape, or five second limiting blocks 35 are arranged in a rectangular shape, wherein four limiting blocks are arranged in a rectangular shape, and another limiting block is arranged at the center of each of the four limiting blocks.

In some embodiments of the present application, the first stopper 34 and the second stopper 35 may be made of foam and/or rubber materials having a high compression ratio. The elastic deformation space that the adoption has the expanded material of high compression ratio or has the rubber materials preparation of high compression ratio first stopper 34 and second stopper 35 can be great, so the accessible makes most stroke and the spacing subassembly contact of magnetic circuit vibration to the setting of first stopper 34 and second stopper 35 thickness, and then improves magnetic circuit's vibration stability through spacing subassembly.

In some embodiments of the present application, the thickness of the first stopper 34 and/or the second stopper 35 satisfies the following formula:

X _f *(1-σ)+X _max ≤X _p ，

wherein, X _f Is the thickness of the first stopper 34 or the second stopper 35, sigma is the compression ratio of the first stopper 34 or the second stopper 35, X _max For maximum displacement of the vibration motor 20 in the vibration direction, X _p A vibration space is reserved for the housing 30 in the corresponding vibration direction.

Based on the formula, the maximum amplitude of the magnetic circuit system can be met, the vibration effect is guaranteed, the thickness of the limiting assembly can reach the maximum value, and therefore the vibration stability of the magnetic circuit system is guaranteed.

Another aspect of the present application also provides an electronic device having the sound-emitting vibration device 1. Since the electronic device adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sound producing vibration device, comprising:

a housing;

2. The sounding vibration device according to claim 1, further comprising a second stopper, wherein the second stopper is disposed between the yoke and the housing and located on a side of the yoke away from the vibration system.

3. The sound vibration device according to claim 2, wherein the first stopper and the second stopper are made of foam and/or rubber material.

4. The sound generating vibration device of claim 2,

the thickness of the first limiting block and/or the second limiting block meets the following formula:

X _f *(1-σ)+X _max ≤X _p ，

wherein X _f Is the thickness of the first limiting block or the second limiting block, and sigma is the first limiting block or the second limiting blockCompression ratio of bit block, X _max For maximum displacement of the vibration motor in the direction of vibration, X _p And reserving a vibration space for the shell in the corresponding vibration direction.

5. The sound generating vibration device of claim 2,

the magnetic circuit system also comprises a side magnet and a central magnet which are arranged on the magnetic yoke, and a magnetic gap is formed between the side magnet and the central magnet;

the vibration system comprises a voice coil inserted into the magnetic gap; the driving system comprises a driving coil which is fixed on the shell outside the side magnet.

6. The sound generating vibration device of claim 5,

the lateral wall of casing inwards extends and has first extension, the outside protrusion of outer edge of yoke has first portion of stretching out, first stopper is located first extension with between the first portion upper surface of stretching out.

7. The sound generating vibration device of claim 6,

the first extending parts are positioned at two ends of the shell, and the first extending parts are positioned at two ends of the magnetic yoke; the number of the first limiting blocks is two, and the first limiting blocks are respectively arranged between the first extending parts and the first extending parts at two ends of the magnetic circuit system.

8. The sound generating vibration device of claim 5,

the second limiting blocks are uniformly distributed on the bottom surface of the shell and are matched with the lower surface of the magnet yoke.

9. The sound generating vibration device of claim 5,

the magnetic circuit system further comprises a first magnetic conduction plate and two second magnetic conduction plates, wherein the first magnetic conduction plates are arranged on the upper surface of the central magnet, and the two second magnetic conduction plates are respectively arranged on the upper surfaces of the two side magnets.

10. An electronic device comprising the sound emitting vibration device according to any one of claims 1 to 9.