CN113747319B

CN113747319B - Sound producing device and electronic equipment

Info

Publication number: CN113747319B
Application number: CN202010487111.5A
Authority: CN
Inventors: 蔡晓东; 张鹏; 侯燕燕; 刘春发
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2024-04-30
Anticipated expiration: 2040-05-29
Also published as: CN113747319A

Abstract

The invention discloses a sound generating device and electronic equipment, wherein the sound generating device comprises a shell, a vibration system, a magnetic circuit system, an elastic support piece and a coil, wherein the shell is provided with an installation space, the vibration system, the magnetic circuit system and the coil are accommodated in the shell, the vibration system sets the installation space as a front sound cavity and a rear sound cavity, the vibration system, the magnetic circuit system and the coil are distributed along the up-down direction, the vibration system comprises a vibrating diaphragm and a voice coil, and the voice coil can interact with a magnetic field of the magnetic circuit system to generate driving force in the up-down direction after being electrified so as to make the vibrating diaphragm vibrate and generate sound; at least part of the magnetic circuit system is supported by an elastic support piece to form a vibrator, and the elastic support piece is elastically deformed along a first horizontal direction; the coil is fixed relative to the shell, and the coil can interact with the magnetic field of the magnetic circuit system to generate a driving force in the first horizontal direction after being electrified, so that the vibrator moves along the first horizontal direction. The technical scheme of the invention can realize the sound production function of the loudspeaker and the function of the linear vibration motor simultaneously, and can realize better sound quality effect.

Description

Sound producing device and electronic equipment

Technical Field

The present invention relates to the field of acoustic energy conversion technologies, and in particular, to a sound generating apparatus and an electronic device.

Background

The loudspeaker is an important acoustic component of the portable electronic equipment, is used for completing the conversion between the electric signal and the sound signal, and is an energy conversion device; a linear vibration motor is one of motors, and is also an important component of portable electronic devices, for implementing a vibration alert function.

The existing two-in-one scheme of the loudspeaker and the vibrating motor is that the loudspeaker and the motor share the same driving coil, and the vibrating diaphragm of the loudspeaker and the vibrator of the motor vibrate in the same direction. This results in that the speaker system and the motor system can only operate simultaneously, as long as the coil is energized, since the coil and the magnetic circuit interact as a force and a reaction force. The mobile phone can not meet the diversified application scenes of the mobile phone, such as only ringing and not vibrating or only vibrating and not ringing.

To solve this problem, it is only possible to filter the low frequency music signal below the resonance frequency of the motor by adjusting the electric signal, so that the vibration of the motor can be reduced but not completely eliminated, and most importantly, the sound quality is poor because the music signal has substantially no low frequency effect.

In addition, when the motor works independently, a low-frequency signal is needed to be loaded on the coil, so that the vibrating diaphragm of the loudspeaker can vibrate along with the coil, and the vibrating diaphragm can be heard by the human ear although the frequency is low, so that the effect of the whole machine is affected.

Disclosure of Invention

The invention mainly aims to provide a sound generating device which aims to simultaneously realize the sound generating function of a loudspeaker and the function of a linear vibration motor and simultaneously realize better sound quality effect.

In order to achieve the above object, the sound generating device provided by the present invention includes a housing formed with an installation space, a vibration system, a magnetic circuit system, an elastic support member and a coil, which are accommodated in the housing; the vibration system sets the installation space as a front sound cavity and a rear sound cavity, and the vibration system, the magnetic circuit system and the coil are distributed along the upper and lower directions, wherein:

The vibration system comprises a vibrating diaphragm and a voice coil, and the voice coil can interact with a magnetic field of the magnetic circuit system to generate driving force in the up-down direction after being electrified so as to make the vibrating diaphragm vibrate and sound;

At least part of the magnetic circuit system is supported by the elastic supporting piece to form a vibrator, and the elastic supporting piece is elastically deformed along a first horizontal direction;

the coil is fixed relative to the shell, and the coil can interact with the magnetic field of the magnetic circuit system to generate a driving force in a first horizontal direction after being electrified, so that the vibrator moves along the first horizontal direction.

Optionally, the magnetic circuit system comprises an inner magnetic circuit system and an outer magnetic circuit system, a magnetic gap is formed between the inner magnetic circuit system and the outer magnetic circuit system, and the voice coil stretches into the magnetic gap; the inner magnetic circuit system forms the vibrator, and the outer magnetic circuit system is fixed on the shell.

Optionally, the inner magnetic circuit system comprises a central magnet, and magnetic poles of the central magnet are distributed along the up-down direction;

The coil comprises a first wire segment and a second wire segment which are distributed along the movement direction of the vibrator, and the first wire segment corresponds to the center magnet.

Optionally, the sound generating device is provided with two elastic supporting pieces, the two elastic supporting pieces are respectively arranged at two opposite sides of the vibrator along the first horizontal direction, and the elastic supporting pieces are fixed on the shell;

the outer magnetic circuit system comprises two side magnets, the two side magnets are respectively arranged on two opposite sides of the inner magnetic circuit system along a second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction.

Optionally, the sound generating device further includes a lower magnetic conductive plate, the lower magnetic conductive plate is fixed on the bottom surface of the housing, and the coil is fixed on the lower magnetic conductive plate.

Optionally, the housing includes an upper shell and a lower shell distributed up and down, and the upper shell and the lower shell jointly enclose to form the installation space.

Optionally, the lower shell comprises a middle frame and a lower cover plate, the middle frame is annular, the lower cover plate covers the lower end opening of the middle frame, and the upper shell covers the upper end opening of the middle frame.

Optionally, the housing includes a first portion and a second portion distributed in a transverse direction, the vibration system, the vibrator and the coil are all mounted on the first portion, the front acoustic cavity is formed in the first portion, one portion of the rear acoustic cavity is located in the first portion, and the other portion is located in the second portion.

Optionally, the upper shell includes a first cover plate and a second cover plate, where the first cover plate is covered above the diaphragm to form a top wall of the front acoustic cavity, and the second cover plate is used to form a top wall of the second part.

Optionally, the distribution direction of the first portion and the second portion is along the first horizontal direction.

Optionally, the sound generating device further includes a frame, the frame is annular, a mounting notch is formed in a side wall of the housing, the frame is mounted in the mounting notch, and an edge of the vibrating diaphragm is fixed to the frame.

Optionally, the frame is installed in the first part of shell, the junction of first part and second part of shell is equipped with the retaining wall, retaining wall with the frame face the one side butt of second part.

The invention further provides electronic equipment, which comprises the sound generating device.

The sound generating device adopts a set of combination of the loudspeaker system and the motor system, and can respectively input different electric signals to realize respective work or synchronous work without mutual influence, thereby simultaneously realizing the sound generating function of the loudspeaker and the function of the linear vibration motor and obtaining better sound quality effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a sound generating apparatus according to an embodiment of the present invention;

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

FIG. 3 is a schematic plan view of the sound emitting apparatus of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the sound emitting device of FIG. 1, with a position of cross-section taken along line B-B of FIG. 3;

FIG. 5 is a schematic view of FIG. 3 taken along line A-A;

FIG. 6 is a schematic view of the sound emitting device of FIG. 1 in cross-section, with the position of the cross-section taken along line A-A in FIG. 3;

FIG. 7 is an enlarged view at C in FIG. 6;

FIG. 8 is an enlarged view of FIG. 6 at D;

FIG. 9 is a schematic cross-sectional view taken along line B-B in FIG. 3;

FIG. 10 is a schematic diagram of the coil of FIG. 1;

FIG. 11 is a schematic diagram of the vibrator in FIG. 9;

FIG. 12 is an exploded view of the transducer of FIG. 11;

FIG. 13 is a schematic view of the vibrator and the lower cover plate in FIG. 6;

FIG. 14 is a schematic view of the internal structure of the sound emitting device of FIG. 1, as seen from the bottom surface, with the lower cover plate removed;

FIG. 15 is a schematic diagram of the lower magnetic plate of FIG. 2;

FIG. 16 is a schematic view of a portion of the sound emitting device of FIG. 1;

FIG. 17 is a schematic diagram illustrating the assembly of the vibrator and the elastic support in FIG. 2;

FIG. 18 is a schematic view of the voice coil of FIG. 2;

FIG. 19 is a schematic view of a portion of another embodiment of a sound generating apparatus according to the present invention;

FIG. 20 is a schematic view of the structure of the bracket of FIG. 2;

FIG. 21 is a schematic view of the structure of the centering disc in FIG. 2;

FIG. 22 is a schematic view of another internal structure of the sound emitting device of FIG. 1;

FIG. 23 is a schematic diagram of a sound generating apparatus according to another embodiment of the present invention;

FIG. 24 is an exploded view of the housing of FIG. 1;

FIG. 25 is a schematic cross-sectional view of the sound emitting device of FIG. 1;

FIG. 26 is a schematic cross-sectional view of a sound emitting device according to another embodiment of the present invention;

Fig. 27 is an exploded view of a portion of the sound emitting device of fig. 1.

Reference numerals illustrate:

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The invention provides a sound generating device, and the up-down direction in the embodiment of the invention refers to the vibration direction of a vibration system, and the transverse direction refers to the direction perpendicular to the vibration direction.

In the embodiment of the invention, the sound generating device comprises a loudspeaker system and a motor system, wherein the loudspeaker system is used as a sound generating unit, and the motor system is used as a vibration unit, so that different electric signals can be respectively input, and the respective work or synchronous work is not affected.

The following describes in detail the specific structure of the sound generating apparatus, which includes a frame 11, and a vibration system, a magnetic circuit system, and a coil 41, which are sequentially distributed in the up-down direction, as shown in fig. 1 to 9.

The frame 11 is used as a mounting member, and can be fixed by a vibration system. The frame 11 is generally annular in shape and extends in the circumferential direction of the vibration system. The frame 11 can be made of metal, so that the heat dissipation effect of the metal is good, and the rapid heat dissipation inside the sound generating device can be realized. In addition, the frame 11 can also be made of plastic materials, so that the structure of each part is conveniently formed by integral injection molding.

The frame 11 may have a ring-shaped structure with a small height as shown in fig. 2, or may have a ring-shaped structure with a large height to form a housing space for housing the vibration system, the magnetic circuit system, the coil 41, and the like.

The vibration system is used as a component of a loudspeaker system and can emit sound. The vibration system comprises a vibrating diaphragm 21 and a voice coil 22, wherein the voice coil 22 is fixed at the bottom of the vibrating diaphragm 21 and is used for driving the vibrating diaphragm 21 to vibrate. Here, the fact that the voice coil 22 is fixed to the bottom of the diaphragm 21 means that the voice coil 22 is directly connected to the diaphragm 21, or that the voice coil 22 is connected to the diaphragm 21 through other structural members, such as a bracket 23. The edge of the diaphragm 21 is fixed on the frame 11, specifically, the edge of the diaphragm 21 is disposed along the circumferential direction of the frame 11, and the edge may be fixed by adhesion, or the diaphragm 21 is formed by a solid rubber material through a hot pressing process and is combined with the surface of the frame 11, so as to realize the sealing connection between the diaphragm 21 and the frame 11.

After the voice coil 22 is energized, it can interact with the magnetic field of the magnetic circuit system to generate a driving force in the up-down direction, so that the diaphragm 21 vibrates and sounds. Specifically, the magnetic circuit system may form a magnetic gap 54, and the voice coil 22 extends into the magnetic gap 54 and is subjected to a magnetic field in the magnetic gap 54 to realize movement in the up-down direction. Taking the magnetic circuit system to form the magnetic gap 54 as an example, the magnetic circuit system may include an inner magnetic circuit system and an outer magnetic circuit system, the magnetic gap 54 is formed between the inner magnetic circuit system and the outer magnetic circuit system, and the voice coil 22 extends into the magnetic gap 54. Of course, in other embodiments, the magnetic circuit system may be formed by combining the energized coil and the magnet together to drive the voice coil 22 to move up and down.

At least part of the magnetic circuit is supported by an elastic support member 35 to form the vibrator 30, the elastic support member 35 has elastic deformation along the first horizontal direction, and the elastic support member 35 can support the vibrator 30 so as to suspend above the coil 41. The vibrator 30 may be formed by an inner magnetic circuit system, or the vibrator 30 may be formed by an outer magnetic circuit system, and the vibrator 30 may be formed by an entire magnetic circuit system, in this embodiment, the vibrator 30 is formed by an inner magnetic circuit system, and the outer magnetic circuit system is fixedly disposed with respect to the frame 11. The vibrator 30 may be formed as a part of the structure forming the magnetic gap 54, so that the speaker system and the motor system share a part of the magnetic circuit. Of course, in other embodiments, the magnetic circuit of the vibrator 30 may not be shared by both.

The coil 41 is used as a component of a motor system and can drive the vibrator 30 to vibrate. The coil 41 is fixed to the frame 11, and when the coil 41 is energized, the coil can interact with the vibrator 30 to generate a lateral driving force so as to move the vibrator 30 laterally. In this embodiment, the fixing of the coil 41 with respect to the frame 11 means that the coil 41 itself is not moved, for example, the coil 41 itself may be directly fixed with the frame 11, or other connection structures or supporting structures may be additionally provided to connect the coil 41 with the frame 11.

The working principle of the sound generating device of the invention is as follows:

The wire of the coil 41 is opposite to the lower end pole of the vibrator 30 (specifically, the center magnet 32 of the vibrator 30 in a specific embodiment), when the coil 41 is energized, the coil 41 receives a force directed to the left, for example, the first horizontal direction is the left-right direction according to the left-hand rule, and since the forces are mutually applied, the center magnet 32 of the vibrator 30 receives a force directed to the opposite direction of the coil 41, for example, a force directed to the right, as well. Since the coil 41 is fixed relative to the frame 11, the center magnet 32 moves to the right under the action of the coil 41, and drives the entire vibrator 30 to move to the right. When the current passing through the coil 41 commutates, the vibrator 30 will move to the left, thereby achieving a linear vibration in the horizontal direction.

In the above description, the vibrator 30 may be used as a common part of the speaker system and the motor system, that is, the speaker system and the motor system share the central magnet 32, the central magnet 32 may be used as a part of an inner magnetic circuit system of the speaker system, and a magnetic gap 54 for accommodating the voice coil 22 is formed together with an outer magnetic circuit system of the speaker system, and the voice coil 22 after being electrified receives a horizontal magnetic field in the magnetic gap 54 to generate a driving force in an up-down direction, so as to drive the diaphragm 21 to sound. At the same time, the center magnet 32 may also be part of a motor system, by co-acting with the coil 41 to effect lateral movement to generate vibrations. Of course, the vibrator 30 may be only a part of the motor system, and the speaker system may implement the up-and-down movement of the voice coil 22 by additionally providing other types of magnetic circuit systems.

The sound generating device adopts a set of combination of the loudspeaker system and the motor system, the loudspeaker system is provided with the independent voice coil, the motor system is provided with the independent coil, and the voice coil and the coil can respectively input different electric signals to realize respective work or synchronous work without mutual influence, thereby simultaneously realizing the sound generating function of the loudspeaker and the function of the linear vibration motor and obtaining better sound quality effect. Compared with the common voice coil or coil of the speaker system and the motor system, the invention has the advantages that the electrical signal input of the speaker system and the electrical signal input of the motor system are independent, so that the speaker system and the motor system can not interfere with each other.

In one embodiment, the vibrator 30 includes a center magnet 32, and the magnetic poles of the center magnet 32 are distributed in the up-down direction, that is, the center magnet 32 is magnetized in the up-down direction, and the N pole and S pole of the center magnet are distributed in the up-down direction. For example, the upper end of the center magnet 32 is an N pole, and the lower end of the center magnet 32 is an S pole.

Referring to fig. 9 and 10 in combination, in one embodiment, the vibrator 30 includes a plurality of center magnets 32, and the plurality of center magnets 32 are spaced apart along the moving direction of the vibrator 30, so as to form a first gap between two adjacent center magnets 32. The coil 41 includes a first wire segment 411 and a second wire segment 412 distributed along the moving direction of the vibrator 30, where the first wire segment 411 is disposed corresponding to one of the center magnets 32, and the second wire segment 412 corresponds to the first gap. In this embodiment, the first wire segment 411 corresponds to the central magnet 32, and means that the first wire segment 411 is located directly under the central magnet 32, and the orthographic projection of the first wire segment 411 on the plane of the bottom surface of the central magnet 32 at least partially falls on the bottom surface of the central magnet 32. Similarly, the second wire segment 412 is also located directly below the first magnetic gap 54.

The number of coils 41 may also be plural, and plural ones of the coils 41 are distributed along the movement direction of the vibrator 30, and each of the coils 41 includes a first wire segment 411 and a second wire segment 412 distributed along the movement direction of the vibrator 30.

In one embodiment, the magnetic poles of the plurality of center magnets 32 are distributed in the same direction, and the first wire segment 411 corresponds to the center magnet 32, so as to provide a transverse driving force for the center magnet 32, the second wire segment 412 corresponds to the first gap, no magnetic force lines pass through the first gap, and the second wire segment 412 does not provide a substantially transverse driving force.

To make the structure more compact, in an embodiment, the current directions of two adjacent coils 41 are opposite, and the first wire segments 411 in two adjacent coils 41 are disposed adjacent to each other and correspond to the same central magnet 32 in common. Specifically, two adjacent coils 41 in the left-right direction are taken as an example, the left side of the left coil 41 is the second wire segment 412, and the right side is the first wire segment 411. The left side in the right coil 41 is a first wire segment 411, and the right side is a second wire segment 412. It should be noted that, in the embodiment of the present invention, the current directions of the first wire segments 411 in the different coils 41 are the same, so when the first wire segments 411 in two adjacent coils 41 are disposed corresponding to the same central magnet 32, the directions of the forces applied to the two first wire segments 411 are the same, so that the reaction forces in the same direction can be given to the central magnet 32 at the same time, and the central magnet 32 is pushed to move laterally.

To further make the structure more compact, in an embodiment, two second wire segments 412 in two adjacent coils 41 commonly correspond to the same first gap. The center magnet 32 is provided with three pieces, and the coil 41 has four pieces, and the three pieces of center magnets 32 form two first gaps in total. In the left-to-right direction, the first wire segment 411 and the second wire segment 412 of the first coil 41 (i.e., the leftmost coil 41) are distributed from left to right, and the distribution directions of the first wire segment 411 and the second wire segment 412 of the adjacent coils 41 are opposite. The first wire segment 411 of the first coil 41 corresponds to the first center magnet 32, the second wire segment 412 of the first coil 41 corresponds to the first gap, the first wire segment 411 of the second coil 41 corresponds to the second center magnet 32, the second wire segment 412 of the second coil 41 corresponds to the first gap, and so on.

In an embodiment, the same coil 41 corresponds to the adjacent center magnet 32 and the first gap, specifically, in the same coil 41, the center magnet 32 corresponding to the first wire segment 411 thereof, and the center magnet 32 forms the sidewall of the first gap corresponding to the second wire segment 412, so that the arrangement of the coils 41 is more compact.

Optionally, the distance between the facing surfaces of the two adjacent second wire segments 412 is smaller than or equal to the width of the first gap, so that the two adjacent second wire segments 412 do not exceed the left and right sides of the first gap, thus avoiding that the second wire segments 412 obstruct the lateral movement of the vibrator 30.

In one embodiment, among the plurality of center magnets 32, the width of the center magnet 32 located at the outermost side is smaller than the width of any one of the center magnets 32. Specifically, taking three center magnets 32 as an example, the width of the leftmost center magnet 32 and the rightmost center magnet 32 may be the same, and the width is smaller than the width of the center magnet 32 in the middle. Thus, the central magnet 32 in the middle has a larger width, so that the two first wire segments 411 can be correspondingly arranged and can be completely shielded above the two first wire segments 411; the width of the center magnet 32 on the left and right sides is smaller, so that one first wire segment 411 can be corresponding to the center magnet, and the space can be reasonably utilized.

In an embodiment, the central magnet 32 and the coil 41 are elongated, and the length directions of the two are the same, and the first wire segment 411 and the second wire segment 412 are long axis segments of the coil 41. In this embodiment, the coil 41 is in a long strip shape, which is provided with a long shaft section and a short shaft section, the length of the long shaft section is greater than that of the short shaft section, and two ends of the short shaft section are respectively connected with the two long shaft sections. Optionally, the length of the center magnet 32 is equal to the length of the long shaft section, so that two ends of the center magnet 32 are flush with two ends of the long shaft section correspondingly, thereby fully utilizing the relative area between the two to realize the maximum driving force while ensuring the overall structure to be more compact.

Referring to fig. 9 in combination, in an embodiment, the vibrator 30 further includes a mass 33, and the center magnets 32 and the mass 33 are alternately arranged. The alternate arrangement herein refers to: at least one mass 33 is disposed between two adjacent center magnets 32, or at least one center magnet 33 is disposed between two adjacent masses 33. In one embodiment, a center magnet 32 is disposed between two adjacent masses 33, and a mass 33 is disposed between two adjacent center magnets 32. Taking three center magnets 32 as an example to form two first gaps, the vibrator 30 in this embodiment includes two masses 33. In this embodiment, the mass 33 is a non-magnet and does not act as a magnet, so that no magnetic lines of force pass therethrough and do not act on the coil 41 below, and the mass can also serve the purpose of increasing the weight of the vibrator 30. The combination scheme can provide a strong magnetic field for both the loudspeaker system and the motor system, ensure that the vibrator 30 of the motor system has enough quality, and consider the performances of the loudspeaker system and the motor system.

Referring to fig. 11 and 12 in combination, the mass blocks 33 and the center magnets 32 together form a main structure 31 of the vibrator 30, and in the main structure 31, all the mass blocks 33 are located between two outermost center magnets 32, that is, two opposite sides of the arrangement direction of the plurality of center magnets 32 are all the center magnets 32, so that the number of the center magnets 32 is always one more than that of the mass blocks 33, correspondingly, more coils 41 can be provided to improve the driving force to the vibrator 30.

The density of the mass 33 may be greater than the density of the center magnet 32, enabling the vibrator 30 to have a sufficient mass. The center magnet 32 may be a high-performance magnet such as nd—fe—b, and the mass 33 may be a material having poor magnetic permeability but high density such as tungsten steel.

The two opposite sides of the mass block 33 may be respectively abutted and fixed with the two adjacent center magnets 32, so as to form a mutually clamped structure, and avoid mutual shaking. In addition, the mass 33 and the center magnet 32 may be fixed by adhesion.

The mass block 33 and the center magnet 32 may be elongated, and the length directions of the two are the same, so that the internal space of the sound generating device can be reasonably utilized. Optionally, the lengths of the mass block 33 and the center magnet 32 are equal, so that two ends of the mass block 33 are aligned with two ends of the center magnet 32, the formed vibrator 30 has a more square structure, and the utilization rate of the internal space of the sound generating device is higher. Here, the length direction of the mass 33 is in the transverse direction and perpendicular to the moving direction of the vibrator 30.

The thickness of the mass 33 and the thickness of the center magnet 32 can be the same, so that the upper surface and the lower surface of the mass are aligned, space is more reasonably utilized, and the mass can be conveniently installed and fixed with other structures such as the center magnetic conduction plate 34.

In one embodiment, the vibrator 30 further includes a central magnetic conductive plate 34, and the central magnetic conductive plate 34 covers the upper surfaces of the plurality of central magnets 32 and is fixed with the plurality of central magnets 32. Specifically, the center magnetically permeable plate 34 has an upper magnetically permeable section 341 that covers the upper surface of the center magnet 32. In this embodiment, the central magnetic conductive plate 34 covers the entire upper surface of the central magnet 32, thereby attracting the magnetic force lines vertically to the upper magnetic conductive section 341. When the mass 33 is provided, the upper magnetically conductive segment 341 also covers the upper surface of the mass 33. The upper magnetically permeable segment 341 may be a unitary plate covering the entire upper surface of the center magnet 32 and the mass 33. Wherein, the mass block 33 and the center magnet 32 can be bonded and fixed with the upper magnetic conductive section 341.

In addition, the central magnetic conductive plate 34 further has a side magnetic conductive section 342, the side magnetic conductive section 342 is connected with the upper magnetic conductive section 341 and extends downward, a downward open accommodating space is formed between the side magnetic conductive section 342 and the upper magnetic conductive section 341, and the central magnet 32 is disposed in the accommodating space. When the mass 33 is disposed between the adjacent two center magnets 32, the mass 33 is also disposed in the accommodating space.

The center magnet 32 and the mass 33 in the embodiment of the present invention together constitute the main structure 31 of the vibrator 30, or in the embodiment where only the center magnet 32 is provided, the center magnet 32 constitutes the main structure 31 of the vibrator 30. The side magnetically conductive segment 342 abuts against the outer side surface of the main body structure 31 to partially or completely cover the outer side surface of the main body structure 31. Specifically, the plurality of center magnets 32 and the mass blocks 33 are alternately arranged in the left-right direction, and when the leftmost and rightmost structures are both the center magnets 32, the side magnetically conductive sections 342 are abutted against the outer side surfaces of the leftmost center magnets 32 and the rightmost center magnets 32, and the side magnetically conductive sections 342 may cover all or part of the same outer side surface of the center magnets 32. When the leftmost and rightmost structures are the mass blocks 33, the side magnetic conductive sections 342 are abutted against the outer side surfaces of the leftmost mass block 33 and the rightmost mass block 33, and the side magnetic conductive sections 342 can cover all or part of the same outer side surface of the mass block 33. Similarly, in other cases, the side magnetic conductive sections 342 correspondingly abut against the outer sides of the corresponding structures. In the embodiment where the mass 33 is not provided, the side magnetic conductive section 342 is abutted against the outer side surface of the center magnet 32.

The central magnetic conductive plate 34 may have two side magnetic conductive sections 342, where the two side magnetic conductive sections 342 are correspondingly connected to two opposite sides of the upper magnetic conductive section 341, and form a containing space together with the upper magnetic conductive section 341, and the two side magnetic conductive sections 342 are correspondingly abutted to two opposite outer sides of the main body structure 31. In this embodiment, the central magnetic conductive plate 34 has a generally U-shaped plate structure with a U-shaped opening facing downward, and encloses the central magnet 32 and the mass 33. The center magnet 32 may be fixed to the center magnetically permeable plate 34 by bonding or welding, or may be fixed by bolting or other means.

When the two side magnetic conductive sections 342 are provided, the two side magnetic conductive sections 342 are distributed along the moving direction of the vibrator 30, so that the two side magnetic conductive sections 342 clamp the center magnet 32 and the mass 33 along the distribution direction of the plurality of center magnets 32 and the mass 33, and clamp the center magnet 32 and the mass 33 with each other.

The side magnetic conductive sections 342 can play a role in magnetic focusing on one hand, and on the other hand, the contact area with the center magnet 32 can be increased, so that connection between the center magnet 32 and the center magnetic conductive plate 34 is more stable, the center magnet 32 can be clamped between the two side magnetic conductive sections 342, the two side magnetic conductive sections 342 provide clamping force, and the center magnet 32 and the mass block 33 are further prevented from falling.

In other embodiments, four side conductive segments 342 may be provided, wherein two opposing side conductive segments 342 completely cover corresponding sides of the main body structure 31, and the other two opposing side conductive segments 342 cover only a portion of the corresponding sides of the main body structure 31. Or the other two side magnetic conductive sections 342 are arranged on the side surface of the mass block 33 and avoid the central magnet 32.

The central magnetic conductive plate 34 may be a single structure, and the side magnetic conductive section 342 and the upper magnetic conductive section 341 are integrally formed, i.e. the side magnetic conductive section 342 and the upper magnetic conductive section 341 are integrally formed by bending the central magnetic conductive plate 34, so that the side magnetic conductive section 342 and the upper magnetic conductive section 341 do not need to be assembled together. Of course, in another embodiment, the side magnetic conductive section 342 and the upper magnetic conductive section 341 may be a separate structure, and the side magnetic conductive section 342 and the upper magnetic conductive section 341 are welded or bonded.

In the invention, the central magnetic conductive plate 34 is integrally bent to form a containing space, specifically, the central magnetic conductive plate 34 is bent at two ends of the movement direction of the vibrator 30 to form a tray structure, the central magnet 32 and the mass block 33 are contained to jointly form the motor vibrator 30, so that the total mass of the vibrator 30 can be increased, a mutually embedded structure can be formed under the clamping of the two side magnetic conductive sections 342, the combination firmness of the central magnetic conductive plate 34, the central magnet 32 and the mass block 33 is ensured, and meanwhile, the welding of the vibrator 30 and the elastic support 35 is facilitated.

In one embodiment, the elastic supporting members 35 are fixed to the side magnetic conductive sections 342, and when two elastic supporting members 35 are disposed along the first horizontal direction, the two elastic supporting members 35 are respectively fixed to the corresponding side magnetic conductive sections 342. The elastic support member 35 is connected with the mounting structure (i.e. the central magnetic conductive plate 34) at the periphery of the vibrator 30, which is beneficial to realizing the integral movement of the vibrator 30.

Referring to fig. 13 in combination, in one embodiment, the lower end of the central magnetic conductive plate 34 extends downward beyond the bottom surface of the main structure 31. Specifically, the height of the side magnetically permeable segment 342 is greater than the height of the body structure 31 (the body structure 31 refers to the center magnet 32 or the mass 33, or to a combination of both the center magnet 32 and the mass 33), such that the bottom surface of the side magnetically permeable segment 342 is lower than the bottom surface of the body structure 31, i.e., the bottom surface of the side magnetically permeable segment 342 is facing downward beyond the bottom surface of the body structure 31.

When the sounding device falls down, the vibrator 30 moves relative to the coil 41 at the bottom (i.e. the side of the lower cover plate 642), and the bottom surface of the vibrator 30 is easy to collide with the coil 41 or the lower cover plate 642. When the bottom surface of the side magnetic conductive section 342 is arranged downward beyond the bottom surface of the main structure 31, when the vibrator 30 collides with the coil 41 or the lower cover plate 642, the side magnetic conductive section 342 collides with the coil 41 or the lower cover plate 642, and the bottom surface of the main structure 31 and the coil 41 always keep a space. In this way, compared with the mode that the whole bottom surface of the vibrator 30 collides with the coil 41, the side magnetic conduction section 342 contacts with the coil 41, so that the contact area of the vibrator 30 and the coil 41 is greatly reduced, and the inertial impact force of the vibrator 30 on the coil 41 is reduced. Conversely, the reverse impact force of the coil 41 on the vibrator 30 is weakened, so that the vibrator 30 can be limited and protected when the product falls, the vibrator 30 is prevented from being too large in shaking and loosening due to the fact that the internal structure is too large in inertial impact force, and meanwhile the elastic support piece 35 and the welding part of the elastic support piece 35 can be prevented from being damaged.

When two side magnetic conductive sections 342 are provided, and the two side magnetic conductive sections 342 are respectively disposed on two opposite sides of the main structure 31, because the two side magnetic conductive sections 342 both exceed the bottom surface of the main structure 31, when the vibrator 30 falls, the two opposite sides of the whole vibrator 30 are in contact with the lower casing 60 or the coil 41 through the two side magnetic conductive sections 342, and the stress of the whole vibrator 30 is more balanced.

In one embodiment, the orthographic projection of the coil 41 on the central magnetic conductive plate 34 is located in the accommodating space. Specifically, the coil 41 is located between the two side magnetically permeable sections 342, and the orthographic projection of the coil 41 on the center magnetically permeable plate 34 falls between the two side magnetically permeable sections 342. In this way, when the vibrator 30 is lowered, the side magnetic conductive section 342 is in contact with the bottom wall of the housing 60, avoiding the coil 41, and the side magnetic conductive section 342 does not press against the coil 41, so that damage to the coil 41 can be avoided.

Alternatively, the vertical distance between the bottom surface of the central magnetically permeable plate 34 and the bottom wall of the housing 60 is smaller than the vertical distance between the bottom surface of the body structure 31 and the upper surface of the coil 41. The bottom surface of the central magnetically permeable plate 34 is referred to herein as the bottom surface of the side magnetically permeable segment 342, and the vertical distance between the bottom surface of the side magnetically permeable segment 342 and the bottom wall of the housing 60 is less than the vertical distance between the bottom surface of the main structure 31 and the upper surface of the coil 41. In this way, when the bottom surface of the side magnetic conductive section 342 contacts the bottom wall of the housing 60, the bottom surface of the main structure 31 is still spaced from the upper surface of the coil 41, so that the impact of the vibrator 30 on the coil 41 is completely avoided.

In this embodiment, the bottom surface of the central magnetically permeable plate 34 refers to the surface of the central magnetically permeable plate 34 closest to the bottom. Similarly, the bottom surface of the main structure 31 also refers to the surface of the main structure 31 closest to the bottom, and when the center magnet 32 and the mass 33 in the main structure 31 are staggered, the bottom surface of the main structure 31 refers to the bottom surface of the part closest to the bottom wall of the housing 60 among the center magnet 32 and the mass 33.

In the embodiment in which the vibrator 30 is formed by the external magnetic circuit system, the vibrator 30 may have the center magnet 32 and the center magnetic conductive plate 34.

Referring to fig. 9, 14 and 15, in one embodiment, a lower magnetic conductive plate 42 is further disposed on the bottom surface of the coil 41, so that magnetic force lines can be vertically attracted to the lower magnetic conductive plate 42, and the lower magnetic conductive plate 42 can also support the coil 41. Wherein the lower magnetically permeable plate 42 may cover the entire lower surface of the coil 41.

The sound generating device further includes a circuit board 43 (FPCB board), and the circuit board 43 connects the coil 41 to an external circuit. The circuit board 43 may be connected to the voice coil 22 to connect the voice coil 22 to an external circuit. Optionally, a circuit board 43 is mounted to the lower magnetic plate 42. Specifically, the lower magnetic conductive plate 42 is provided with at least one limiting notch 421, and the circuit board 43 is provided with a plug board 431, and the plug board 431 is adapted to be inserted into the limiting notch 421, so as to limit the movement of the circuit board 43. By this arrangement, the main body portion (i.e., the portion located in the frame 11) of the circuit board 43 and the lower magnetic conductive plate 42 are substantially located on the same plane, so that the occupation of the space in the vertical direction is reasonably utilized, and the excessive overall thickness is avoided. In this embodiment, the insert plate 431 may be regarded as a part of the lower magnetic conductive plate 42, and the entire lower surface of the coil 41 is covered.

Referring to fig. 16 and 17 in combination, in an embodiment, the vibrator 30 and the coil 41 are disposed at intervals along the up-down direction, so that the vibrator 30 may be suspended above the coil 41, and the sound generating device further includes an elastic support member 35, where the elastic support member 35 is connected to the vibrator 30, so as to suspend the vibrator 30 above the coil 41. The elastic support 35 in this embodiment has an elastic deformation in the direction of movement of the vibrator 30, thereby ensuring that the vibrator 30 can move in the lateral direction.

The elastic support 35 may be fixed to the frame 11, the lower magnetic plate 42 or some other connecting structure, so as to avoid itself moving in the lateral direction, but only being deformed in the lateral direction.

Specifically, the elastic support 35 includes a bent connection arm 351 and two elastic arms 352 connected to the connection arm 351, where the connection arm 351 is formed by bending along a crease perpendicular to the moving direction of the vibrator 30, in this embodiment, the crease is in an up-down direction, and the two elastic arms 352 are spaced apart along the moving direction of the vibrator 30, where one of the elastic arms 352 is connected to the vibrator 30, and may be fixed by welding or other means, and the other elastic arm 352 is fixed relative to the frame 11. The other resilient arm 352 is fixed relative to the frame 11, meaning that it is fixed to the frame 11, or to the frame 11 by other structural members, or the resilient arm 352 is fixed to other connecting structures that are relatively fixed to the frame 11. For example, the elastic arm 352 may be fixed to any one of the housing 60, the lower magnetically permeable plate 42, or the side magnetic circuit system. Furthermore, the elastic support 35 may also be a spring. The crease of the connecting arm can also be a direction perpendicular to the movement direction of the vibrator in the horizontal direction.

In order to improve the stability of the movement of the vibrator 30, in one embodiment, the sound generating device includes two elastic supporting members 35, and the two elastic supporting members 35 are disposed on opposite sides of the vibrator 30 along the movement direction of the vibrator 30. The arrangement of the two elastic supporting pieces 35 can enable the two opposite sides of the vibrator 30 to bear force, and the stress of the vibrator 30 is balanced, so that stability of the vibrator 30 during movement is achieved, and shaking of the vibrator 30 in the up-down direction is reduced. In addition, the two elastic supporting pieces 35 can jointly support the vibrator 30, so that the bottom surface of the vibrator 30 is prevented from contacting the coil 41, the coil 41 can be prevented from blocking the vibrator 30 to move back and forth, and the vibrator 30 can be prevented from colliding to damage the coil 41.

Taking the left-right direction as an example, when the vibrator 30 moves laterally to the left, the vibrator 30 presses the left elastic support 35 so that the elastic arm 352 connected thereto moves to the side where the other elastic arm 352 is located, and the left elastic support 35 is compressed. Meanwhile, for the elastic support 35 on the right side, the elastic arm 352 adjacent to the vibrator 30 is pulled toward the left side by the vibrator 30 while being away from the other elastic arm 352, so that the elastic support 35 on the right side is stretched. Conversely, when the vibrator 30 is laterally moved toward the right, the right elastic support 35 is compressed, and the left elastic support 35 is stretched. In this way, the vibrator 30 moves back and forth between the left and right elastic supporting members 35, and the left and right elastic supporting members 35 realize that the vibrator 30 is suspended above the coil 41 on the one hand, and give the vibrator 30 a reverse acting force on the other hand, so that the vibrator 30 can be reset.

Referring again to fig. 4, in an embodiment of the present invention, the speaker system and the motor system may share a portion of the magnets, such as the center magnet 32. Of course, separate magnets may be used for the speaker system and the motor system.

In the following description, a magnetic circuit system is taken as an example of a part shared by the speaker system and the motor system, and in this embodiment, the vibrator 30 is a part shared by the speaker system and the motor system, and the vibrator 30 can drive the voice coil 22 to move up and down and also can interact with the coil 41 to realize lateral movement. Thus, the motor vibrator 30 can be realized to share the magnetic force of the magnetic field and use the weight of the magnet, and a large space can be saved.

Specifically, the magnetic circuit system comprises an outer magnetic circuit system and an inner magnetic circuit system, a magnetic gap 54 is formed between the outer magnetic circuit system and the inner magnetic circuit system, the voice coil 22 stretches into the magnetic gap 54, and the voice coil 22 is subjected to magnetic force of the inner magnetic circuit system and the outer magnetic circuit system in the magnetic gap 54 to realize up-and-down movement.

In one embodiment, the inner magnetic circuit forms the vibrator 30, and the outer magnetic circuit is fixed relative to the frame 11. In contrast, in an embodiment, the outer magnetic circuit forms the vibrator 30, and the inner magnetic circuit is fixed relative to the frame 11.

In the following description, the vibrator 30 is an example of an internal magnetic circuit configuration, and the vibrator 30 is an internal magnetic circuit of a speaker system, and an external magnetic circuit may be disposed around the vibrator 30 to form a circumferential magnetic gap 54. The external magnetic circuit system may be an integral ring structure or may be constituted by a plurality of structures arranged at intervals along the circumferential direction of the vibrator 30. In one embodiment, the magnetic gap 54 formed between the external magnetic circuit system and the vibrator 30 is not annular, for example, two magnetic gaps 54 are formed between the external magnetic circuit system and the vibrator 30, and the two magnetic gaps 54 are distributed on two opposite sides of the vibrator 30.

In an embodiment, the external magnetic circuit system includes a plurality of side magnets 51, where the number of side magnets 51 may be plural, and the plural side magnets 51 are spaced apart from each other along the circumferential direction of the vibrator 30, so as to form a magnetic gap 54 with the vibrator 30. Optionally, the outer magnetic circuit system includes two side magnets 51, and the two side magnets 51 are respectively disposed on two opposite sides of the inner magnetic circuit system along a second horizontal direction, where the second horizontal direction is perpendicular to the first horizontal direction. In this way, the side magnets 51 are provided so as to avoid the movement path of the vibrator 30, so that it is possible to ensure a sufficient movement space of the vibrator 30 and avoid interference with the vibrator 30. The magnetic poles of the side magnets 51 are distributed in the vertical direction, and are combined with the center magnet 32 to form a magnetic circuit.

The external magnetic circuit system may further include an upper magnetic plate 52, where the upper magnetic plate 52 is fixed on the top surface of the side magnet 51. In this embodiment, the upper magnetic plate 52 may extend in a ring shape along the circumferential direction of the frame 11, the upper magnetic plate 52 is fixed on the bottom surface of the frame 11, and has a side magnetic section 521 protruding laterally from the inner side of the frame 11, the side magnet 51 is located on the bottom surface of the side magnetic section 521, and the side magnet 51 is located on the inner side of the frame 11. The number of side magnetic conductive sections 521 is equal to the number of side magnets 51, and one side magnetic conductive section 521 is disposed on the upper surface of each side magnet 51. For example, the outer magnetic circuit system is provided with two side magnets 51, and the upper side magnetic conductive plate 52 is correspondingly provided with two side magnetic conductive sections 521. In this embodiment, the upper magnetic conductive plate 52 includes an annular body and two magnetic conductive segments 521, the two magnetic conductive segments 521 are respectively connected to the inner side of the annular body, and the two magnetic conductive segments 521 are disposed on two opposite sides of the annular body. The annular body extends in the circumferential direction of the frame 11 and is provided at the bottom surface of the frame 11.

The external magnetic circuit system may further include a lower magnetic plate 53, and the lower magnetic plate 53 is fixed to the bottom surface of the side magnet 51. In this embodiment, the lower magnetic plate 53 may also be located inside the frame 11. In the present embodiment, the inner side or the outer side of the frame 11 refers to the inner side and the outer side distributed in the lateral direction. By providing the magnetic conductive plates on both the upper and lower sides of the side magnet 51, the voice coil 22 can be subjected to a larger magnetic field force.

In the embodiment in which the speaker system and the motor system share a part of the magnet, that is, the vibrator 30, the voice coil 22 is inserted into the magnetic gap 54 between the vibrator 30 and the external magnetic circuit system, and therefore, the voice coil 22 must have a part of the structure at the same level as the vibrator 30, and in this case, the vibration system, the vibrator 30, and the coil 41 are sequentially distributed in the up-down direction, that is, the diaphragm 21, the vibrator 30, and the coil 41 are sequentially distributed in the up-down direction.

For the speaker system and the motor system each using a separate magnet, the vibrator 30 does not participate in the up-and-down movement of the voice coil 22 as a part of the speaker system, and the sound generating apparatus additionally includes an inner magnetic circuit system, and a magnetic gap 54 for accommodating the voice coil 22 is formed between the sound generating apparatus and the outer magnetic circuit system. Wherein the inner magnetic circuit and the outer magnetic circuit are located above or at the periphery of the vibrator 30.

In the embodiment of the present invention, the axial direction of the voice coil 22 may be perpendicular to the vibration direction of the vibration system, or the axial direction of the voice coil 22 may be along the vibration direction of the vibration system, which will be described in detail below by way of two different embodiments.

Referring to fig. 5 and 18 in combination, in one embodiment, the axial direction of the voice coil 22 is perpendicular to the vibration direction of the vibration system, and the axial direction of the voice coil 22 is transverse, for example, the axial direction of the voice coil 22 may be parallel to the second horizontal direction. In this embodiment, the flat voice coil 22 is adopted as the voice coil 22, and the flat structure of the flat voice coil 22 means that the flat voice coil 22 is flat in its axial direction. Specifically, the width between the inner peripheral surface and the outer peripheral surface of the flat voice coil 22 is larger than the thickness of the flat voice coil 22 in the axial direction. The flat voice coil 22 is formed by winding conductive wires, and the number of layers of the conductive wires in the axial direction of the flat voice coil 22 is smaller than the number of layers of the conductive wires in the radial direction of the flat voice coil 22. In this embodiment, the conductive wires of the flat voice coil 22 are distributed along the radial direction thereof, that is, wound in the radial direction. The flat voice coil 22 has a smaller height along the axial direction thereof, for example, the number of layers formed by winding the conductive wires of the flat voice coil 22 along the axial direction thereof may be one or a smaller number of layers, so that the thickness of the flat voice coil 22 along the axial direction thereof is smaller; in the radial direction of the flat voice coil 22, the number of turns formed by winding the conductive wires is large, so that the widths formed by the conductive wires are large, and the flat voice coil 22 forms a flat structure with small axial thickness and large radial width.

The flat voice coil 22 may be generally racetrack-shaped and have two opposing third wire segments 221, the third wire segments 221 being the long axis of the flat voice coil 22. Wherein, two third wire segments 221 are spaced apart from each other along the up-down direction.

Adopt flat voice coil 22 to the axial of flat voice coil 22 is perpendicular to vibration system's vibration direction, and the space that flat voice coil 22 axially occupied is less, so can reduce the width of magnetic gap 54, and the space that magnetic gap 54 occupy diminishes, thereby the corresponding inside space that has saved sound generating mechanism has, make sound generating mechanism inside have bigger space holding magnet, so can improve its acoustic properties through increasing magnet size, namely under the prerequisite that does not increase sound generating mechanism overall dimension, the volume of magnet can be bigger, effect to flat voice coil 22 is better, make vibrating diaphragm 21's vibration amplitude bigger.

The sound generating device may have two voice coils 22, where the two voice coils 22 are separately disposed on two opposite sides of the vibrator 30, and the distribution directions of the two voice coils 22 are perpendicular to the movement direction of the vibrator 30, for example, the vibrator 30 moves in the left-right direction, and the two voice coils 22 are spaced apart in the front-rear direction. In this embodiment, the voice coil 22 is disposed so as to avoid the movement path of the vibrator 30, and interference with the movement of the vibrator 30 can be avoided. In the present embodiment, the sound generating device has two side magnets 51, the two side magnets 51 are disposed on opposite sides of the vibrator 30, a magnetic gap 54 is formed between each side magnet 51 and the vibrator 30, and the two voice coils 22 are disposed on the two magnetic gaps 54. Obviously, the side magnets 51 are not arranged on the left side and the right side of the vibrator 30, so that the space on the left side and the right side of the vibrator 30 is larger, and the space can be used for placing the elastic support piece 35; on the other hand, a sufficient left-right movement space of the vibrator 30 is also ensured.

In one embodiment, the voice coil 22 is elongated, and the length direction thereof is along the moving direction of the vibrator 30. In this embodiment, the magnetic gap 54 is elongated, the length direction thereof is along the left-right direction, the width direction thereof is along the front-rear direction, the long axis of the flat voice coil 22 is along the length direction of the magnetic gap 54, the short axis of the flat voice coil 22 is along the depth direction (i.e. the up-down direction) of the magnetic gap 54, and the axial direction of the flat voice coil 22 is along the width direction of the magnetic gap 54, so that the space utilization rate can be greatly improved. The magnetic circuit structure design and the corresponding adoption of the flat voice coil 22 save the internal space of the sound generating device, and the acoustic performance of the sound generating device can be improved by increasing the sizes of the side magnet 51 and the center magnet 32.

In one embodiment, the vibrator 30 has two first sides and two second sides, the two first sides are disposed opposite to each other, the two second sides are disposed opposite to each other, the voice coil 22 faces the second sides, and the end of the voice coil 22 extends beyond the first sides. Specifically, the length of the third wire segment 221 of the voice coil 22 is greater than the length of the second side, thereby enabling the third wire segment 221 to extend beyond the first side, such that the short axis segment of the voice coil 22 is located outside the magnetic gap. After the arrangement, the connection with the support 23 can be realized conveniently, the support 23 can be arranged on one side where the first side face is located, and a gap exists between the support 23 and the first side face, and the support is avoided from being arranged right above the vibrator 30, when the support 23 moves up and down under the driving of the voice coil 22, the support 23 can be prevented from being contacted with the vibrator 30 in the up and down direction, and accordingly interference of the vibrator 30 to the movement of the support 23 is avoided.

Since the magnetic gap 54 needs to be formed between the vibrator 30 and the side magnet 51, the side magnetic conductive section 342 should be provided so as to avoid the side of the side magnet 51, and the side magnet 51 faces the surface of the vibrator 30 where the side magnetic conductive section 342 is not provided. In a specific embodiment, the main body structure 31 has two first sides and two second sides, the two first sides are disposed opposite to each other, the two second sides are disposed opposite to each other, the two first sides have side magnetic conductive sections 342, the side magnets 51 are disposed facing the second sides, and the gaps between the side magnets 51 and the second sides form a magnetic gap 54, and the two voice coils 22 are disposed on the two second sides separately. In other embodiments, the second side may also be provided with a side magnetic conductive section 342, where the side magnetic conductive section 342 only partially shields the second side. For example, the side magnetically permeable segments 342 are shielded from the surface of the mass 33.

Referring to fig. 20 and 22 in combination, the sound generating apparatus may further include a bracket 23, and the bracket 23 is connected to the diaphragm 21 and the voice coil 22, respectively, such that the voice coil 22 is connected to the diaphragm 21 through the bracket 23. Taking two voice coils 22 as an example, the sound generating device may include two brackets 23, where the distribution directions of the two brackets 23 are the same as the movement direction of the vibrator 30, and the brackets 23 extend in a long strip shape along the distribution directions of the two voice coils 22, and the same bracket 23 is connected with the two voice coils 22. Thus, two ends of the voice coil 22 are respectively connected with two brackets 23, and the voice coil 22 can be supported by the two brackets 23, so that the stability in the up-and-down movement of the voice coil 22 can be greatly improved.

The support 23 includes a first connection section 231 and two second connection sections 232 respectively disposed at two ends of the first connection section 231, wherein the two second connection sections 232 extend downward, one of the second connection sections 232 is connected with one voice coil 22, and the other second connection section 232 is connected with the other voice coil 22. In this embodiment, the first connection section 231 and the second connection section 232 form a U-shaped structure, and the U-shaped opening faces downward. Since the second connection segments 232 are connected to the voice coil 22 and the voice coil 22 is located outside the vibrator 30, it can be seen that the first connection segments 231 span the vibrator 30 and the vibrator 30 is located between the two second connection segments 232, so that interference to the movement of the vibrator 30 can be avoided. Alternatively, the first connection section 231 is located above the vibrator 30, so that interference with the movement of the vibrator 30 can be completely avoided. The second connection section 232 is connected to an end surface of the voice coil 22, and may specifically be connected to an end surface of the voice coil 22 facing away from the vibrator 30. As shown in fig. 16, the two ends of the voice coil 22 protrude from the magnetic gap 54, and the second connection section 232 of the bracket 23 is connected to the end of the voice coil 22 protruding from the magnetic gap 54, without increasing the width of the magnetic gap 54.

Referring to fig. 21 and 22 in combination, the sound generating apparatus may further include a centering pad 24 for elastically supporting the vibration system, and the centering pad 24 may be an FPCB having a cantilever structure; or an auxiliary supporting film with arc-shaped bulges is adopted, and the material of the auxiliary supporting film can be the same as or different from that of the vibrating diaphragm; or the centering lugs 24 employ a combination of the above two, in which the FPCB and the auxiliary support film are disposed in the up-down direction. In this embodiment, the centering support adopts an FPCB structure. The centering support piece 24 comprises a fixing section 241 and a supporting section 242 which are elastically connected, the supporting section 242 can elastically move relative to the fixing section 241, the fixing section 241 is fixed relative to the frame 11, the installation and the positioning of the centering support piece 24 are realized, the centering support piece 24 is prevented from moving, and vibration of the vibrating diaphragm 21 is not participated. The support section 242 is combined with at least one of the voice coil 22, the diaphragm 21 and the bracket 23 to stabilize the vibration system and prevent the vibration of the vibration system as the center of the diaphragm 21 moves up and down with respect to the fixing section 241 when the diaphragm 21 moves up and down. In the embodiment in which the support section 242 is connected to the diaphragm 21, the support section 242 is connected to the center portion or the dome on the center portion of the diaphragm 21.

The centering piece 24 can set up in the downside of support 23, and the downside of support 23 is supported by centering piece 24, and joint strength is high to make the motion of support 23 more steady, the centering effect is strong, even make the stability of voice coil 22 better, the vibration amplitude of vibrating diaphragm 21 is more even, can avoid vibrating diaphragm 21 to produce polarization, can effectively reduce the noise, helps improving sound quality of sound generating mechanism. In addition, the sound generating device may include two centering support pieces 24, and the two centering support pieces 24 are distributed at intervals along the movement direction of the vibrator 30, so that the stress on two opposite sides of the diaphragm 21 is more balanced. Wherein, the two centering support pieces 24 are connected with the two brackets 23 in a one-to-one correspondence; or both centering tabs 24 are connected to the diaphragm or voice coil.

The centering support piece 24 can be provided with two support sections 242, the two support sections 242 are distributed at intervals along the length direction of the support 23 and are correspondingly connected with two ends of the support 23 so as to support the two ends of the support 23, so that the support 23 moves up and down more stably, and the polarization phenomenon is greatly reduced.

The support section 242 may be a flexible cantilever that may be bent, for example, back and forth, to provide greater flexibility and support smoothness.

The fixing section 241 of the centering pad 24 may be connected to the frame 11, the upper magnetic plate 52, or other structures on the sound generating device, and the fixing section 241 is described below in conjunction with the bottom surface of the upper magnetic plate 52. The fixing section 241 may be in a strip shape, and extends along the circumferential direction of the upper magnetic conductive plate 52 to have a larger contact area with the upper magnetic conductive plate 52. The fixed section 241 is disposed on one side of the upper magnetic conductive plate 52, which is not connected to the side magnetic conductive section 521. The support section 242 protrudes inwardly from the inner side of the upper magnetic plate 52 and is suspended in the gap between the upper magnetic plate 52 and the vibrator 30, so that the vibrator 30 moves between the two centering support pieces 24. In addition, two support sections 242 are spaced apart along the length of the fixed section 241.

The centering lugs 24 are located above the elastic support 35, so that interference with elastic deformation of the elastic support 35 can be avoided.

In the above description, the support 23 further includes a third connection section 233, where the third connection section 233 is connected to the first connection section 231, and the third connection section 233 extends downward to be connected to the centering bracket 24. The end of the third connecting section 233 may be bent laterally to form a flange, so that a larger connecting area with the top surface of the centering bracket 24 may be provided. In addition, the bracket 23 is provided with a third connecting section 233 corresponding to each of the two supporting sections 242.

Referring to fig. 19 in combination, in one embodiment, the axial direction of the voice coil 25 is along the vibration direction of the vibration system, and the axial direction of the voice coil 25 is along the up-down direction. Specifically, the voice coil 25 may encircle the outer side of the vibrator 30, so that the vibrator 30 moves in a space formed by the enclosed voice coil 25, and the inner space of the voice coil 25 may be fully utilized, so that the structure is more compact. In the common vibrator 30, the voice coil 25 is located in a magnetic gap 54 formed between the vibrator 30 and the external magnetic circuit system. In this embodiment, the voice coil 25 is designed around the vibrator 30, and the moving direction of the voice coil 25 is the same as the axial direction thereof.

Optionally, in the direction of movement of the vibrator 30 (i.e. a first horizontal direction), the voice coil 25 has two opposite short axis sides 251, a first distance is provided between the short axis sides 251 of the voice coil 25 and the vibrator 30, and in the horizontal direction perpendicular to the direction of movement of the vibrator 30 (i.e. a second horizontal direction), the voice coil 25 has two opposite long axis sides 252, and a second distance is provided between the long axis sides 252 of the voice coil 25 and the vibrator 30, said first distance being larger than said second distance. In this way, the first pitch is large in the direction of movement of the vibrator 30, so that it is possible to ensure that the vibrator 30 has a sufficient space to perform movement. In the horizontal direction perpendicular to the movement direction of the vibrator 30, the second interval is smaller, and the vibrator 30 does not need to move in the direction, so that the waste of space at the position can be avoided, and the structure is more compact.

The first pitch is much larger than the second pitch in view of the movement of the vibrator 30, e.g. the first pitch is larger than or equal to twice the second pitch.

In an embodiment, the first distance is greater than or equal to 0.4mm and less than or equal to 1.0mm, and the distance can provide enough movement space for the movement of the vibrator 30, and meanwhile, the situation that the whole machine is oversized due to oversized movement space can be avoided.

In an embodiment, the second distance is greater than or equal to 0.05mm and less than or equal to 0.15mm, which can avoid contacting the voice coil 25 when the vibrator 30 moves, and can avoid wasting the whole space due to too large gap in the direction of the second distance.

In this embodiment, the external magnetic circuit system may include four side magnets 51, and the four side magnets 51 are disposed on four sides of the center magnet 32. In order to avoid interference with the side magnets 51 during the movement of the vibrator 30, in another embodiment, the external magnetic circuit system includes only two side magnets 51, which are disposed corresponding to the two long axis sides of the voice coil 25.

In this embodiment, the support 23 is also connected to the diaphragm 21 and the voice coil 25 by combining the centering support 24 and the support 23, and the support 23 may be connected to the peripheral side or the end surface of the voice coil 25. The centering support 24 may be directly attached to the end surface of the voice coil 25, or the centering support 24 may be attached to the bracket 23.

To avoid the voice coil 25 interfering with the deformation of the elastic support 35, in one embodiment, the elastic support 35 further has an extension arm 353, and the extension arm 353 is connected to the elastic arm 352 near the vibrator 30, and the extension arm 353 is also connected to the vibrator 30. In this embodiment, the extension arm 353 is located below the voice coil 25, and the two elastic arms 352 may be located outside the voice coil 25. Even though the elastic arm 352 and the voice coil 25 are partially constructed at the same level in the up-down direction, since the elastic arm 352 and the voice coil 25 are laterally spaced apart, and the extension arm 353 connected to the vibrator 30 is positioned below the voice coil 25, the voice coil 25 does not hinder the deformation of the elastic support 35. Optionally, an extension arm 353 is connected to the free end of the resilient arm 352. In addition, the voice coil 25 may be disposed above the elastic support 35, so that the deformation of the elastic support 35 is prevented from being hindered.

Referring to fig. 23 in combination, the sound generating device in the embodiment of the invention may be a speaker unit. The speaker unit has a rectangular structure as a whole, specifically, a rectangular frame 12 (both parts 121, 122 are shown as the frame 12) forms a structure with two open ends, and the edge portion of the diaphragm 21 is fixed to the upper end surface of the frame 12 and seals the upper end opening. The lower end of the frame 12 is provided with a bottom plate which corresponds to the shape of the frame 12 and forms an accommodating space together, the frame 12 and the bottom plate form a peripheral frame structure of the loudspeaker system and the motor system together, the voice coil 22, the vibrator 30 and the coil 41 are all arranged in the accommodating space, and the coil 41 is fixed on the bottom plate.

In one embodiment, the lower magnetically permeable plate 42 is positioned between the coil 41 and the bottom plate.

In another embodiment, the lower magnetic conductive plate 42 also serves as a bottom plate, and the external magnetic circuit system is fixed on the lower magnetic conductive plate 42 and supported by the lower magnetic conductive plate 42. In this embodiment, the external magnetic circuit system includes a side magnet 51, the side magnet 51 is fixed on the lower magnetic conductive plate 42, and directly contacts the lower magnetic conductive plate 42, and the lower magnetic conductive plate 42 also has a magnetism collecting effect on the side magnet 51. The lower magnetic plate 42 in this embodiment is different from the lower magnetic plate 42 in the module in that the lower magnetic plate 42 covers the entire bottom surface of the frame 12 to prevent other structures inside from falling out.

In addition, the outer magnetic circuit system further includes an upper magnetic plate 52, and the upper magnetic plate 52 may be disposed in the accommodating space, where the upper magnetic plate 52 is located on the top surface of the side magnet 51. An upper magnetic plate 52 may be disposed on the top surface of each side magnet 51, and the upper magnetic plate 52 may be annular. The frame 11 may be divided into an upper and a lower shell structures, and the upper magnetic conductive plate 52 may be sandwiched between the upper and lower shell structures.

In one embodiment, the resilient support 35 may be secured to the frame 12, for example, one of the resilient arms 352 of the resilient support 35 may be secured to an inner side of the frame 12, such that movement of the resilient support 35 relative to the frame 12 may be prevented. The elastic support 35 is welded and fixed with the frame 12, or the elastic support 35 is adhered and fixed with the frame 12, or the elastic support 35 is clamped and fixed with the frame 12, or the elastic support 35 is connected with the frame 12 through screws, etc.

In an embodiment, the fixing section 241 of the centering plate 24 is fixed to the frame 12, specifically, the fixing section 241 of the centering plate 24 may be connected to an inner side surface of the frame 12, or a fixing notch is formed on the frame 12, and the fixing section 241 of the centering plate 24 is mounted on the fixing notch and seals the fixing notch to avoid water leakage of the fixing notch.

In one embodiment, the frame 12 may be formed from a combination of multiple sections. Specifically, the frame 12 includes a first frame 121 and a second frame 122 distributed from top to bottom, the edge of the diaphragm 21 is fixed to the upper end of the first frame 121, and the bottom plate is fixed to the lower end of the second frame 122. The structure that the first frame 121 and the second frame 122 are arranged in a split mode is adopted, independent processing of each part is facilitated, and processing difficulty of each part can be reduced. In addition, the first frame 121 and the second frame 122 may be made of different materials, and in a specific embodiment, the first frame 121 is made of a plastic piece and may be integrally injection-molded with the edge of the diaphragm 121; the second frame 122 is made of metal, so as to achieve rapid heat dissipation and ensure the overall strength of the frame 12.

In another embodiment, the frame 12 is a unitary structure, eliminating the need for subsequent assembly steps.

In an embodiment, the sound generating device further includes a front cover, the front cover is abutted against the upper surface of the edge of the diaphragm 21, and the front cover is disposed around the edge of the diaphragm 21, so that a space for the diaphragm 21 to vibrate is formed in the middle of the front cover. Of course, in other embodiments, the sound generating device may not include the front cover.

The front 61 and rear 62 acoustic chambers of the sound generating device are not physically separated by the present solution by designing the sound generating device in a speaker-like monolithic manner. The sounding device can be directly loaded into a whole machine application in a single form or loaded into a Box body (SPK Box) application in a kernel form, and the application mode is relatively flexible.

In some embodiments, the frame 12 may be formed by the side magnet 51, where the side magnet 51 itself and the internal magnetic circuit system form a magnetic field for driving the voice coil 22 to move up and down, and meanwhile, the side magnet 51 may also have the function of the frame 12, so that the arrangement of components can be reduced, and the installation is simplified.

In some embodiments, the structure of the housing 60 may refer to the frame 12 and the bottom plate, and the housing 60 may be formed by the frame 12 and the bottom plate together, and the vibration system, the magnetic circuit system, and the coil 41 are combined with the housing 60 to form a single structure. Optionally, the housing 60 is a metal piece to facilitate rapid heat dissipation from the unit.

Referring to fig. 1, 6, 24 and 25, the sound generating apparatus in the embodiment of the present invention may be in a module form, that is, the sound generating apparatus may further include a housing 60, the housing 60 is formed with an installation space, the vibration system, the vibrator 30 and the coil 41 are all installed in the installation space, and the installation space is set to be a front sound cavity 61 and a rear sound cavity 62, and the front sound cavity 61 is formed on the upper side of the diaphragm 21. Normally, the sound outlet 69 is formed on the wall of the front sound cavity 61 and is communicated with the opening of the whole machine, so that the transmission of sound is realized.

By providing the housing 60, the vibration system, the vibrator 30, the coil 41, and other structures are housed in the housing 60, and collision damage of these structures can be avoided. Meanwhile, the whole modularization of the sound generating device can be realized, and the shell 60 can be directly connected with the whole machine, so that the assembly of the sound generating device and the whole machine can be simplified.

In one embodiment, the housing 60 is formed by combining a plurality of structures, and each part is separately processed, so that the processing difficulty of each part structure can be reduced. For example, the housing 60 includes an upper case 63 and a lower case 64 that are separately provided, and the upper case 63 and the lower case 64 are enclosed together to form an installation space. In one embodiment, the lower shell 64 has an upwardly open cavity and the upper shell 63 covers the opening of the lower shell 64. The lower case 64 may further include a middle frame 641 and a lower cover plate 642, the middle frame 641 is ring-shaped, the lower cover plate 642 covers the lower end opening of the middle frame 641, and the upper case 63 is disposed at the upper end of the middle frame 641 and can cover the upper end opening of the middle frame 641.

In an embodiment, the side edge of the upper shell 63 is integrally bent to form a limiting rib 633, and the limiting rib 633 abuts against the outer side surface of the middle frame 641, so as to limit the movement of the upper shell 63. A plurality of stopper ribs 633 may be provided at intervals in the circumferential direction on the side edges of the upper case 63 so as to abut against the middle frame 641 in a plurality of directions, thereby completely restricting the movement of the upper case 63 in the horizontal direction with respect to the middle frame 641.

In an embodiment, a mounting lug 6421 is formed at a side edge of the lower cover plate 642, the mounting lug 6421 protrudes laterally from a side surface of the middle frame 641, and a fixing hole is integrally punched on the mounting lug 6421. In this embodiment, the mounting ear plate 6421 is connected to the whole machine, so that the sound generating device is fixed on the whole machine. After the fixing holes are formed, the mounting ear plate 6421 may be fixed to the whole machine housing with screws. The mounting ear plate 6421 itself is also a metal member, and has high strength. In one embodiment, three mounting lugs 6421 are formed on the side edges of the lower cover 642, and the three mounting lugs 6421 are disposed at three corners of the lower cover 642. In other embodiments, the sound generating device and the whole machine shell can be fixed in a clamping manner.

Optionally, the casing 60 is a metal piece, and the metal casing 60 has a good heat dissipation effect, and can also integrally form a fixing structure connected with other structures. In this scheme, the upper case 63, the middle frame 641, and the lower cover plate 642 are all made of metal materials, so that heat generated in the electromagnetic conversion process of the system can be conducted and dispersed well, and the heat dissipation efficiency of the system is improved. In addition, the fixing screw hole between the sound generating device and the whole machine such as a mobile phone can be directly processed by the metal part, so that a good fixing effect is achieved.

In one embodiment, the sound generating device further includes a frame 11, and the frame 11 is mounted to the housing 60. In one embodiment, referring to fig. 7, the housing 60 is provided with a mounting notch, and the frame 11 is mounted in the mounting notch. Specifically, the mounting notch may be formed by the upper case 63 and the lower case 64 together; or the mounting notch is opened at the upper end of the lower shell 64 and is formed by the lower shell 64 alone, and the upper shell 63 can cover the upper side of the mounting notch; alternatively, in the embodiment in which the lower case 64 is divided into the middle frame 641 and the lower cover plate 642, the installation notch is formed by the upper case 63 and the middle frame 641 together. Taking the example that the mounting notch is formed at the upper end of the middle frame 641, in this embodiment, the frame 11 is disposed between the upper shell 63 and the middle frame 641, the upper end of the frame 11 is connected with the lower end of the upper shell 63 in a sealing manner through the diaphragm 21, and the lower end of the frame 11 is connected with the upper end of the middle frame 641 in a sealing manner, i.e. the frame 11 can fill the mounting notch, so as to avoid water leakage.

After the installation notch is arranged, on one hand, the upper and lower limiting effect on the frame 11 can be achieved; on the other hand, after the frame 11 is inserted into the mounting notch, the space formed between the frames 11 is larger than the space formed by abutting the frame 11 against the inner side surface of the housing 60, so that the area of the diaphragm 21 covered on the frame 11 is necessarily larger, so that the diaphragm 21 can fully utilize the inner space of the housing 60, and the effective vibration area of the vibrator is increased.

In other embodiments, for the sound generating device in the form of a module, the frame 11 may not be provided, and the diaphragm may be directly fixed to the housing 60. Alternatively, the frame 11 is integrally formed with the housing 60, and the housing 60 also serves as a frame structure. In addition, in other embodiments, the frame 11 may be secured to the inside surface of the housing 60.

In the embodiment where the upper magnetic plate 52 is annular, the upper magnetic plate 52 may be installed in the installation notch, so that the lower end of the frame 11 abuts against the upper surface of the upper magnetic plate 52, and the lower surface of the upper magnetic plate 52 abuts against the upper end of the lower shell 64, and both of them together fill the installation notch.

While in embodiments where the centering tabs 24 are provided, the securing section 241 of the centering tabs 24 may be mounted to the housing 60, such as in a mounting notch, the centering tabs 24 may be clamped between the upper magnetic plate 52 and the lower housing 64.

In the present embodiment, the side magnet 51 is located inside the housing 60, and the lower side magnetic plate 53 is also located inside the housing 60.

In one embodiment, the ring formed by the frame 11 is smaller than the ring formed by the lower shell 64, so that one part of the frame 11 is located in the mounting notch, and the other part is located in the mounting space. The axis of the upper magnetic plate 52 coincides with the axis of the frame 11, and the ring formed by the two plates may be uniform in size.

The frame 11 and the shell 60 can be directly designed into an integrated form in the scheme, the front acoustic cavity 61 and the rear acoustic cavity 62 of the sounding device product are separated and sealed, the short circuit of sound waves in the front acoustic cavity 62 and the rear acoustic cavity 62 is prevented, and the tone quality and the tone volume of the sounding device are improved. And the design is that the available make full use of space of module structure, and frame 11 extends to the installation breach of installing to shell 60 in, can increase the radiating area (Sd) of vibrating diaphragm 21, promotes the acoustic performance of product.

In the above, the lower magnetic conductive plate 42 at the bottom of the coil 41 may be fixed to the bottom surface of the housing 60, thereby achieving the relative fixation between the coil 41 and the frame 11. The lower magnetic plate 42 and the housing 60 may be fixed by welding or bonding.

The lower magnetic plate 53 may be provided on the bottom surface of the housing 60 and supported by the housing 60.

The elastic support 35 may be fixed to the housing 60, for example, one elastic arm 352 of the elastic support 35 may be fixed to an inner side surface of the housing 60, specifically, may be fixed to an inner side surface of the middle frame 641, so that the elastic support 35 may be prevented from moving relative to the housing 60 and the frame 11. The elastic support member 35 is welded and fixed to the housing 60, or the elastic support member 35 is bonded and fixed to the housing 60, or the elastic support member 35 is clamped and fixed to the housing 60, or the elastic support member 35 is connected with the housing 60 by screws, or the like.

Referring to fig. 8 and 27 in combination, in an embodiment, a mounting hole 65 is formed in a cavity wall of the rear acoustic cavity 62, a flexible deformation portion 70 is disposed on the mounting hole 65, and the flexible deformation portion 70 seals the mounting hole 65.

When the diaphragm 21 vibrates, the internal sound pressure of the rear acoustic chamber 62 changes, and the flexible deformation portion 70 deforms due to the change of the sound pressure in the acoustic chamber 62, so as to flexibly adjust the volume of the rear acoustic chamber 62.

Further, the mounting hole 65 is further provided with a protective cover plate 80 located at the outer side of the flexible deformation portion 70, and an avoiding space for avoiding the vibration of the flexible deformation portion 70 is formed between the protective cover plate 80 and the flexible deformation portion 70. The protective cover plate 80 may be made of one material selected from a metal sheet, an FR-4 sheet, a PET sheet, a PEN sheet, a carbon fiber sheet, a ceramic sheet, etc., and has a certain hardness and strength, so as to protect the inner flexible deformation portion 70. As one embodiment, the protective cover 80 is made of stainless steel which has high strength and is not easily corroded. The protective cover plate 80 has high strength and can be made thin, for example, the thickness of the protective cover plate 80 is less than or equal to 0.2mm, and even less than or equal to 0.1mm, so that the protective cover plate 80 does not occupy too much space of the product Z axis (i.e. up-down direction), and the problem that the flexible deformation portion 70 is damaged or broken by the external environment in the transportation or assembly process can be avoided.

In a specific embodiment, the outer surface of the protective cover 80 is not higher than the outer surface of the housing 60, so that the protective cover 80 is not easy to contact with other components, and a better protective effect can be achieved.

And a plurality of ventilation holes 81 are formed in the protective cover plate 80, the ventilation holes 81 can be specifically manufactured in a punching or laser drilling mode, the protective cover plate 80 cannot isolate the outer space of the flexible deformation portion 70 from the external environment, and the ventilation holes 81 can realize pressure balance in the vibration process of the flexible deformation portion 70.

Specifically, the area of each ventilation hole 81 in the invention can be smaller than or equal to 0.2mm ², so that the ventilation holes 81 can prevent liquid and impurities from invading the space between the protective cover plate 80 and the flexible deformation part 70 under the condition that the strength of the protective cover plate 80 is not affected, the influence on the performance and the service life of the flexible deformation part 70 is avoided, and further, dustproof mesh cloth does not need to be attached to the protective cover plate 80, the material cost and the assembly procedure can be reduced, and the Z-axis space of a product is saved.

The shape of the ventilation holes 81 is not limited, and may be any shape such as a circle, a square, an ellipse, etc. In this embodiment, the ventilation holes 81 are circular holes, and the aperture of the ventilation holes 81 is 0.5mm or less to satisfy the aperture area of 0.2mm ² or less. Alternatively, the aperture of the ventilation holes 81 is less than or equal to 0.3mm. For example, the aperture is 0.3mm, so that better dustproof and waterproof effects can be achieved, and the difficulty and cost for manufacturing micropores are relatively low.

Further, the distance between the edges on the connecting line of the centers of two adjacent ventilation holes 81 is more than or equal to 0.3mm and less than or equal to 1mm. Specifically, the thickness of the protective cover 80 may be 0.4mm, 0.5mm, 0.6mm, 0.7mm, etc., while the strength and the workability are both compatible. Wherein, the distance between the edges on the central connecting line of the two adjacent ventilation holes 81 refers to the distance between the two adjacent ventilation holes 81.

The specific structure of the protective cover plate 80 may be: comprises a fixed wall 82, a protection wall 83 and a connecting wall 84, wherein the fixed wall 82 and the protection wall 83 are connected through the connecting wall 84, and the fixed wall 82 surrounds the outer side of the protection wall 83. The fixing wall 82 and the protecting wall 83 are located on different planes, the fixing wall 82 is close to the flexible deformation portion 70 relative to the protecting wall 83, the fixing wall 82 is fixed on the housing 60, an avoidance space is formed between the protecting wall 83 and the flexible deformation portion 70, and the ventilation holes 81 are formed in the protecting wall 83 and/or the connecting wall 84, for example, the ventilation holes 81 are formed in the fixing wall 82 and the protecting wall 83 at the same time.

For easy installation, the hole wall of the housing 60 and the mounting hole 65 may be recessed toward the position of the rear acoustic cavity 62 to form a sink 66, the sink 66 is disposed around the mounting hole 65, and the fixing wall 82 is fixed at the bottom 661 of the sink 66, which may be specifically fixed by gluing or double-sided adhesive.

As a specific example, the edge portion 73 of the flexible deformation portion 70 is first connected to the fixing wall 82 of the protective cover 80 and then fixed to the groove bottom 661 of the sink 66. The flexible deformation part 70 is firstly combined to the protective cover plate 80, the flexible deformation part 70 is made of soft materials, the protective cover plate 80 plays a role in supporting and shaping the flexible deformation part 70, abnormal size of the flexible deformation part 70 caused by deformation can be avoided, poor performance is caused, the assembly process is optimized, automatic feeding can be realized, and the production efficiency is improved.

As another embodiment, the protective cover 80 is first fixed to the housing 60, and the flexible deformation portion 70 is fixed to the housing 60 from the inside of the housing 60. Specifically, the protective cover plate 80 may be fixed on the housing 60 by means of adhesion, or the protective cover plate 80 is injection-fixed on the housing 60, so as to implement integrated combination, improve combination firmness, implement automatic assembly, and improve efficiency.

As a specific embodiment, the flexible deformation portion 70 may be combined with the housing 60, and the housing 60 may be used as an insert, and the flexible deformation portion 70 may be integrally injection molded to the housing 60, for example, the flexible deformation portion 70 may be integrally injection molded with the lower cover plate 642. The flexible deformation portion 70 may be fixedly connected to the housing 60 around the mounting hole 65 by adhesion, welding, or heat fusion.

As an embodiment, an air flow channel is formed between the connecting wall 84 of the protective cover 80 and the groove wall of the sink 66 (i.e. the area in the sink 66 not filled by the protective cover 80 and the flexible deformation portion 70), when the sound generating device is assembled to the whole machine, and the casing 60 and the protective cover 80 are abutted to each other, the air flow channel can communicate the air holes 81 on the protective cover 80 with the space of the whole machine, so as to avoid the air holes 81 from being blocked by other parts and losing the air pressure balance.

In one embodiment, the housing 60 is formed by combining a plurality of structures, and the mounting hole 65 may be formed on the lower case 64, and in particular, may be formed on the lower cover plate 642. The lower cover plate 642 at the periphery of the mounting hole 65 is recessed upward to form a sink 66, the flexible deformation portion 70 is fixed to the bottom 661 of the sink 66, and the bottom 661 of the sink 66 is downward, i.e. the flexible deformation portion 70 is mounted on the outer surface of the lower cover plate 642. In addition, the mounting hole 65 and the flexible deformation portion 70 are not limited to one set, and a plurality of sets may be provided at different positions of the lower cover plate 642.

When the sound generating device is in a working state and the diaphragm 21 vibrates downwards to compress the volume at the rear side of the diaphragm 21, sound pressure is transmitted to the flexible deformation part 70 through the rear acoustic cavity 62, and the flexible deformation part 70 moves towards the outer side of the rear acoustic cavity 62 to expand and deform; in contrast, when the diaphragm 21 vibrates upward, the flexible deformation portion 70 contracts and deforms inward, so that the volume of the rear acoustic cavity 62 is adjusted, the equivalent acoustic compliance of the rear acoustic cavity 62 is increased, the resonance frequency of the sound generating device is effectively reduced, and the low-frequency sensitivity and the low-frequency playback effect are improved.

Specifically, the flexible deformation portion 70 includes a body portion 71, where the body portion 71 may have a single-layer structure, and the single-layer structure may be made of one material of a polymer plastic, a thermoplastic elastomer, and a silicone rubber, or may have a multi-layer structure, and at least one layer of the multi-layer structure is made of one material of a polymer plastic, a thermoplastic elastomer, and a silicone rubber.

The body portion 71 may be a flat plate structure, which is advantageous for reducing the height of the flexible deformation portion 70 and reducing the occupied space of the flexible deformation portion 70. The body 71 may also have a partially convex or concave structure, such as a convex central portion, a convex edge portion 73, or a combination of a convex central portion and a convex edge portion 73, or at least the edge portion 73 of the body 71 may be in a wavy structure. In a specific embodiment, the edge of the body 71 is provided with a folded ring 72, and the folded ring 72 protrudes from the outside of the housing 60 toward the rear acoustic cavity 62; or the folded ring part 72 protrudes outwards from the interior of the rear acoustic cavity 62, and through the structure of the folded ring part 72, larger elastic deformation can be provided, so that the vibration displacement of the flexible deformation part 70 is increased, and the volume adjusting effect on the rear acoustic cavity 62 is improved.

In order to enhance the vibration effect, a composite sheet may be further stacked on the central position of the body portion 71 of the flexible deformation portion 70, and the strength of the composite sheet is higher than that of the body portion 71, and may be metal, plastic, carbon fiber, or a composite structure thereof, or the like. In addition, the body portion 71 of the flexible deformation portion 70 may be a sheet-shaped integral structure, or may be a hollow-out portion at the center of the body portion 71, and the hollow-out portion may be closed by a composite sheet.

In this embodiment, the rear acoustic chamber 62 extends in a horizontal direction of the length and width of the acoustic device, which may also be defined by a direction perpendicular to the thickness direction of the acoustic device. The horizontal direction generally refers to the direction parallel to a horizontal plane when the sounding device is placed on the horizontal plane, so that the sounding device does not occupy space in the height direction as much as possible, and the design of thinning products is facilitated.

Referring to fig. 1 and 25 in combination, in one embodiment, the housing 60 includes a first portion 671 and a second portion 672 which are distributed in a transverse direction, the frame 11, the vibration system, the vibrator 30 and the coil 41 are all mounted to the first portion 671, and the front acoustic chamber 61 is formed in the first portion 671, a portion of the rear acoustic chamber 62 is formed in the first portion 671, and another portion of the rear acoustic chamber 62 is formed in the second portion 672. In this manner, the height of the second portion 672 may be greater, resulting in a greater volume of the entire rear acoustic chamber 62. In one embodiment, the mounting hole 65 is formed in the second portion 672, and the flexible deformation portion 70 is mounted to the second portion 672. In this embodiment, the second portion 672 protrudes laterally from the first portion 671, and the whole space of the second portion 672 may be set larger, for example, the length of the second portion 672 (that is, the length along the arrangement direction of the first portion 671 and the second portion 672) may be larger, so that the length of the mounting hole 65 is correspondingly larger, so that the flexible deformation portion 70 has a larger area, and the volume of the rear acoustic chamber 62 is better adjusted. Further, all of the speaker system and the motor system are mounted to the first portion 671, and no other structure is mounted in the second portion 672, so that when the flexible deformation portion 70 vibrates, there is no case where the other structure interferes with the vibration thereof.

The scheme increases supplementary flexible deformation portion 70 and protective cover 80 at sound generating set back sound cavity 62, forms flexible back chamber system (FRC), improves extra back sound cavity 62 volume and compliance for initiative radiation vibrating diaphragm 21, promotes the low frequency playback effect of sound generating set product. In addition, since the rear acoustic cavity 62 of the product is sealed by the flexible deformation portion 70, the air flow cannot flow out from the rear acoustic cavity 62 and enter the electronic equipment such as the mobile phone to cause resonance of the rear shell of the mobile phone, so that the application experience of the whole machine can be improved.

Referring to fig. 25 and 26 in combination, in one embodiment, the rear acoustic chamber 62 has a first rear chamber 621 and a second rear chamber 622, the second rear chamber 622 being filled with acoustic absorbing particles 91. Wherein, in order to avoid the sound absorbing particles 91 from running into the first back cavity 621, the first back cavity 621 and the second back cavity 622 are separated by the ventilation package 92. It is conceivable that ventilation holes are provided in the ventilation package 92 to serve as a communication between the first rear chamber 621 and the second rear chamber 622. The breathable enclosure 92 may be a mesh or a metal net or the like. Of course, the sound absorbing particles 91 themselves may be enclosed in a gas permeable bag and then placed in the second rear cavity 622. The sound-absorbing particles 91 may be particles having a microporous structure, such as one or more of natural zeolite powder, white carbon black, activated carbon, etc., and of course, other materials may be used for the sound-absorbing particles 91 as long as they have sound-absorbing effect.

The particulate matter that has microporous structure is added to the cavity part that this scheme utilized sound generating mechanism back sound cavity 62, can be used to adsorb the air molecule, plays the effect of virtual increase back sound cavity 62 volume, promotes sound generating mechanism's low frequency playback effect.

In an embodiment, the first rear cavity 621 and the second rear cavity 622 are distributed along the transverse direction, so that the thickness of the sound generating device in the up-down direction is smaller, and the sound generating device can be better matched with the whole machine, and the thickness of the whole machine is prevented from being too large. Specifically, the first back cavity 621 and the second back cavity 622 may be distributed along the movement direction of the vibrator 30.

In an embodiment, the volume of the first rear cavity 621 is smaller than the volume of the second rear cavity 622, so that more sound-absorbing particles can be filled in the second rear cavity 622 with a larger volume, and the expansion effect is better.

The housing 60 in the present embodiment includes a first portion 671 and a second portion 672 distributed in the lateral direction, the frame 11, the vibration system, the vibrator 30, and the coil 41 are mounted to the first portion 671, and a part of the front acoustic chamber 61 and the rear acoustic chamber 62 (referred to as a first rear chamber 621 in the present embodiment) is formed in the first portion 671, and in the present embodiment, the first rear chamber 621 is formed at the bottom of the first portion 671. Another portion of the rear acoustic chamber 62, referred to in this embodiment as the second rear chamber 622, is formed in the second portion 672. In this manner, the height of the second portion 672 may be greater, such that the space of the second rear cavity 622 is formed to be greater.

When the frame 11 is disposed, the frame 11 is mounted to the first portion 671. To better limit the frame 11, in one embodiment, a blocking wall 68 is provided at the connection between the first portion 671 and the second portion 672, and the blocking wall 68 abuts against a side of the frame 11 facing the second portion 672, so as to limit the movement of the frame 11 toward the side of the second rear cavity 622. In this embodiment, the side of the frame facing the second portion 672 refers to the side adjacent to the side of the second portion 672. Specifically, the blocking wall 68 is disposed on the upper surface of the housing 60, and of course, the blocking wall 68 may be disposed on the lower surface or side of the housing 60. The outer surface of the upper magnetic plate 52 may be in contact with the blocking wall 68. Similarly, the outer surface of the centering pin 24 may abut the blocking wall 68.

Optionally, the blocking wall 68 separates the front 61 and rear 62 acoustic chambers together with the diaphragm and the frame 11, i.e. the blocking wall 68 completely blocks the side of the frame 11 which does not protrude into the mounting recess.

In one embodiment, the vibrator 30 is capable of moving in the distribution direction of the first portion 671 and the second portion 672 under the driving of the coil 41. The housing 60 in this embodiment is divided into a first portion 671 and a second portion 672 along the transverse direction, so that it can be seen that the housing 60 is substantially elongated in the distribution direction of the first portion 671 and the second portion 672, and therefore, when the vibrator 30 moves, the space in the length direction of the housing 60 can be fully utilized to realize the movement.

The top wall of the housing 60 may be formed from a combination of multiple panels to facilitate the processing of the individual panels. In one embodiment, the upper shell 63 includes a first cover plate 631 and a second cover plate 632, wherein the first cover plate 631 covers the diaphragm 21 to form a top wall of the front acoustic chamber 61, and the second cover plate 632 is used to form a top wall of the second portion (i.e. the second rear chamber 622). The blocking wall 68 may be formed on a side edge of the first cover plate 631 or the second cover plate 632, for example, formed by integrally bending a side edge of the second cover plate 632.

There are various connection modes between the ventilation package 92 and the housing 60, for example, a slot is provided on the housing 60 to connect with the ventilation package 92, and the connection mode is simple and reliable for positioning the ventilation package 92. Or the air-permeable packing member 92 and the casing 60 are fixed by heat fusion, of course, the air-permeable packing member 92 and the casing 60 may be fixed by welding or bonding. Or the air-permeable packing 92 is integrally injection-molded with the housing 60, and the air-permeable packing 92 is integrally injection-molded with the housing 60 as an insert. The heat-melting, welding, bonding and integral injection molding have good sealing effect, and can effectively prevent the sound absorbing particles 91 from entering the first rear cavity 621 from the connecting gap between the ventilation packaging member 92 and the shell 60.

The embodiment of the invention also provides electronic equipment which can be a mobile phone, a tablet personal computer, a notebook computer and the like. The sounding device is arranged in the electronic equipment, and an opening is formed in the electronic equipment. For the sound generating device is a single body, a front sound cavity 61 and a rear sound cavity 62 are formed between the sound generating device and the inner wall of the electronic equipment, and the front sound cavity 61 is communicated with the opening. For the sound generating device as a module, the sound generating device is provided with a front sound cavity 61 and a rear sound cavity 62, and the front sound cavity 61 is provided with a sound outlet 69 for communicating with an opening of the electronic equipment.

The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims

1. The sound generating device is characterized by comprising a shell, a vibration system, a magnetic circuit system, an elastic support piece and a coil, wherein the shell is provided with an installation space, and the vibration system, the magnetic circuit system, the elastic support piece and the coil are contained in the shell; the vibration system, the magnetic circuit system and the coil are distributed along the upper and lower directions, the vibration system sets the installation space as a front sound cavity and a rear sound cavity, wherein:

The coil is fixed relative to the shell, and the coil can interact with the magnetic field of the magnetic circuit system to generate a driving force in a first horizontal direction after being electrified so as to enable the vibrator to move along the first horizontal direction;

The magnetic circuit system comprises an inner magnetic circuit system and an outer magnetic circuit system, a magnetic gap is formed between the inner magnetic circuit system and the outer magnetic circuit system, and the voice coil stretches into the magnetic gap; the inner magnetic circuit system forms the vibrator, and the outer magnetic circuit system is fixed on the shell.

2. The sound generating apparatus according to claim 1, wherein the internal magnetic circuit system includes a center magnet whose magnetic poles are distributed in an up-down direction;

3. The sound generating apparatus according to claim 1, wherein the sound generating apparatus has two elastic supporting members, the two elastic supporting members being disposed on opposite sides of the vibrator in the first horizontal direction, the elastic supporting members being fixed to the housing;

4. The sound emitting apparatus of claim 1 further comprising a lower magnetically permeable plate secured to a bottom surface of the housing, the coil being secured to the lower magnetically permeable plate.

5. The sound emitting apparatus of claim 1 wherein the housing comprises an upper shell and a lower shell disposed vertically, the upper shell and the lower shell collectively enclosing the mounting space.

6. The sound generating apparatus of claim 5, wherein the lower housing comprises a middle frame and a lower cover plate, the middle frame is annular, the lower cover plate covers a lower end opening of the middle frame, and the upper housing cover covers an upper end opening of the middle frame.

7. The sound emitting apparatus as claimed in any one of claims 1 to 6, wherein the housing comprises a first portion and a second portion distributed in a transverse direction, the vibration system, the vibrator and the coil are mounted to the first portion, the front sound chamber is formed in the first portion, and a part of the rear sound chamber is located in the first portion and another part is located in the second portion.

8. The sound emitting device of claim 7, wherein the upper housing comprises a first cover plate and a second cover plate, the first cover plate being disposed over the diaphragm to form a top wall of the front acoustic chamber, the second cover plate being disposed to form a top wall of the second portion.

9. The sound emitting apparatus of claim 7 wherein the direction of distribution of the first portion and the second portion is along the first horizontal direction.

10. The sound generating apparatus of claim 1, further comprising a frame, wherein the frame is annular, wherein a mounting notch is formed in a side wall of the housing, wherein the frame is mounted in the mounting notch, and wherein an edge of the diaphragm is fixed to the frame.

11. The sound emitting device of claim 10, wherein the frame is mounted to the first portion of the housing, and a wall is provided at a junction between the first portion and the second portion of the housing, the wall abutting a side of the frame facing the second portion.

12. An electronic device comprising a sound emitting apparatus according to any one of claims 1-11.