CN113747315A

CN113747315A - Sound production device and electronic equipment

Info

Publication number: CN113747315A
Application number: CN202010487094.5A
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: 2021-12-03
Anticipated expiration: 2040-05-29
Also published as: CN113747315B

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 supporting piece and a coil, wherein the shell is provided with an installation space; the vibration system divides the installation space into a front sound cavity and a rear sound cavity, the rear sound cavity comprises a first rear cavity and a second rear cavity, and the second rear cavity is used for filling sound absorption particles; 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 vertical direction after being electrified so as to enable the vibrating diaphragm to vibrate and sound; at least part of the magnetic circuit system is supported by an elastic supporting piece to form a vibrator, and the elastic supporting piece has elastic deformation along a first horizontal direction; the coil is fixed relative to the shell, and after being electrified, the coil can interact with a magnetic field of the magnetic circuit system to generate a driving force in a first horizontal direction so as to enable the vibrator to move along the first horizontal direction.

Description

Sound production 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 device and an electronic apparatus.

Background

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

The existing two-in-one scheme of the loudspeaker and the vibration motor is that the loudspeaker and the motor share the same driving coil, and a vibrating diaphragm of the loudspeaker and a 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 are acting and reacting with each other. The diversified application scenes of the mobile phone cannot be met, such as ringing without vibration or vibrating without ringing.

To solve this problem, it can only be realized by adjusting the electric signal, i.e. filtering the low-frequency music signal below the resonant frequency of the motor, so that the vibration of the motor can be reduced but not completely eliminated, and most importantly, the music signal has no low-frequency effect basically, and the sound quality is poor.

In addition, when the motor works alone, a low-frequency signal needs to be loaded on the coil, so that the diaphragm of the loudspeaker can vibrate along with the coil, and the human ear can still hear the low-frequency signal, so that the effect of the whole machine is affected.

Disclosure of Invention

The invention mainly aims to provide a sound production device, which aims to realize the sound production function of a loudspeaker and the function of a linear vibration motor at the same time and realize better sound quality effect.

In order to achieve the purpose, the sound production device provided by the invention comprises a shell, a vibration system, a magnetic circuit system, an elastic supporting piece and a coil, wherein the shell is provided with an installation space;

the vibration system divides the installation space into a front sound cavity and a rear sound cavity, the rear sound cavity comprises a first rear cavity and a second rear cavity, and the second rear cavity is used for filling sound absorption particles;

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 vertical direction after being electrified so as to enable the vibrating diaphragm to 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 has elastic deformation along a first horizontal direction;

the coil is fixed relative to the shell, and after being electrified, the coil can interact with the magnetic field of the magnetic circuit system to generate a driving force in a first horizontal direction, 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 extends 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 path system comprises a central magnet, and magnetic poles of the central magnet are distributed along the up-down direction;

the coil comprises a first lead section and a second lead section which are distributed along the motion direction of the vibrator, and the first lead section corresponds to the central magnet.

Optionally, the sound generating device has two elastic supporting members, and the two elastic supporting members are respectively disposed on two opposite sides of the vibrator along the first horizontal direction;

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 first rear cavity and the second rear cavity are distributed in a transverse direction.

Optionally, the housing includes a first portion and a second portion distributed in a transverse direction, the vibration system, the magnetic circuit system and the coil are all mounted on the first portion, the front acoustic cavity is formed on the first portion, the first back cavity is located at the bottom of the first portion, and the second back cavity is located on the second portion.

Optionally, the volume of the second rear cavity is greater than the volume of the first rear cavity.

Optionally, the sound generating device further comprises a breathable enclosure secured to the housing and separating the first back volume from the second back volume.

Optionally, a slot is arranged on the housing for the air-permeable packaging part to be inserted; or the air-permeable packaging piece is fixed with the shell in a hot melting way; or the air-permeable packaging piece is welded or bonded with the shell; alternatively, the breathable package is integrally injection molded with the housing.

Optionally, the sound generating device further comprises a frame, the frame is annular, an installation notch is formed in the side wall of the shell, the frame is installed in the installation notch, and the edge of the vibrating diaphragm is fixed to the frame.

Optionally, the frame is mounted to the first portion of the housing, a blocking wall is disposed at a joint of the first portion and the second portion of the housing, the blocking wall abuts against a side of the frame facing the second portion, and the blocking wall, the diaphragm, and the frame jointly separate the front acoustic cavity and the rear acoustic cavity.

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

The sound production device adopts the combination of the loudspeaker system and the motor system, and different electric signals can be respectively input to realize respective work or synchronous work without mutual influence, so that the sound production function of the loudspeaker and the function of the linear vibration motor can be simultaneously realized, and a better sound quality effect is obtained.

Drawings

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

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

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

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

FIG. 4 is a schematic sectional view of the sound generator of FIG. 1, wherein the sectional position is along section line B-B of FIG. 3;

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

FIG. 6 is a schematic sectional view of the sound generator of FIG. 1, wherein the sectional position is along section line A-A of FIG. 3;

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

FIG. 8 is an enlarged view taken at D in FIG. 6;

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

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

FIG. 11 is a schematic structural diagram of the transducer of FIG. 9;

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

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

FIG. 14 is a schematic view of the sound generating device shown in FIG. 1, with the lower cover removed and the interior thereof viewed from the bottom; fig. 15 is a schematic structural view of the lower magnetic conductive plate in fig. 2;

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

FIG. 17 is an assembled view of the vibrator and the elastic supporting member shown in FIG. 2;

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

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

FIG. 20 is a schematic structural view of the stent of FIG. 2;

FIG. 21 is a schematic view of the configuration of the headpiece of FIG. 2;

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

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

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

FIG. 25 is a cut-away schematic view of the sound generator of FIG. 1;

FIG. 26 is a schematic sectional view of a further embodiment of the sound generator of the present invention;

fig. 27 is an exploded view of a portion of the sound generator of fig. 1.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment 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 relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a sound production device, and it should be noted that 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 and can respectively input different electric signals to realize that the respective work or the synchronous work does not influence each other.

The specific structure of the sound generating device is described in detail below, and as shown in fig. 1 to 9, the sound generating device 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.

The frame 11 serves as a mounting member to which the vibration system can be fixed. The frame 11 is substantially annular in shape and extends in the circumferential direction of the vibration system. The frame 11 can be made of metal, the metal has a good heat dissipation effect, and the inside quick heat dissipation of the sound generating device can be realized. In addition, the frame 11 can be made of plastic, so that the structures of all parts can be 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 a component of a loudspeaker system that is capable of emitting sound. The vibration system comprises a diaphragm 21 and a voice coil 22, wherein the voice coil 22 is fixed at the bottom of the diaphragm 21 and is used for driving the diaphragm 21 to vibrate. It should be noted that, here, the voice coil 22 is fixed on the bottom of the diaphragm 21, which means that the voice coil 22 is directly connected to the diaphragm 21, or the voice coil 22 is connected to the diaphragm 21 through another structural member, such as a bracket 23. The edge of the diaphragm 21 is fixed to the frame 11, specifically, the edge of the diaphragm 21 is disposed along the circumference of the frame 11, and the two may be fixed by bonding, or the diaphragm 21 is formed by a solid rubber material through a hot-pressing process and combined on the surface of the frame 11, so as to achieve the sealing connection between the diaphragm 21 and the frame 11.

After being electrified, the voice coil 22 can interact with the magnetic field of the magnetic circuit system to generate a driving force in the vertical direction, so that the diaphragm 21 vibrates to produce sound. 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 perform a vertical movement. Taking the magnetic circuit system forming 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 inner magnetic circuit system and the outer magnetic circuit system forming the magnetic gap 54 therebetween, and the voice coil 22 extending into the magnetic gap 54. Of course, in other embodiments, the magnetic circuit system may be formed by a combination of a coil and a magnet, which are energized to drive the voice coil 22 up and down.

At least part of the magnetic circuit system is supported by an elastic support 35 to form the vibrator 30, the elastic support 35 has elastic deformation along the first horizontal direction, and the elastic support 35 can support the vibrator 30 to suspend above the coil 41. In this embodiment, the vibrator 30 may be composed of an internal magnetic circuit system, or the vibrator 30 may be composed of an external magnetic circuit system, or the vibrator 30 may be composed of the entire magnetic circuit system, in this embodiment, the vibrator 30 is composed of an internal magnetic circuit system, and the external magnetic circuit system is fixedly disposed relative to the frame 11. Here, the transducer 30 may be 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 two may not share the magnetic circuit of the vibrator 30.

Coil 41 is a component of a motor system and is capable of driving vibrator 30 to vibrate. The coil 41 is fixed to the frame 11, and when the coil 41 is energized, it can interact with the vibrator 30 to generate a lateral driving force to laterally move the vibrator 30. In the present embodiment, the coil 41 is fixed with respect to the frame 11 means that the coil 41 itself does not move, for example, the coil 41 itself may be directly fixed with the frame 11, or other connecting structures or supporting structures may be additionally provided to connect the coil 41 with the frame 11.

The working principle of the sound production device is as follows:

the lead of coil 41 is opposite to the lower end pole of vibrator 30 (specifically, in the embodiment, center magnet 32 of vibrator 30), and when coil 41 is energized, coil 41 is subjected to a leftward force according to the left-hand rule, taking the first horizontal direction as the left-right direction as an example, and since the forces are mutually acting, similarly, center magnet 32 of vibrator 30 is also subjected to a reverse force of coil 41, such as a rightward force. Since the coil 41 is fixed to the frame 11, the central magnet 32 moves to the right side by the coil 41, and the entire vibrator 30 is moved to the right. When the current through coil 41 is reversed, vibrator 30 will move to the left, thereby achieving linear horizontal vibration.

In the above description, the vibrator 30 may be a part shared by 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 a part of an inner magnetic circuit system of the speaker system, and form a magnetic gap 54 for accommodating the voice coil 22 together with an outer magnetic circuit system of the speaker system, and the voice coil 22 after being energized is subjected to a horizontal magnetic field in the magnetic gap 54 to generate a vertical driving force, so as to drive the diaphragm 21 to generate sound. At the same time, the central magnet 32 may also be moved laterally as part of the motor system by cooperating with the coil 41 to generate vibrations. Of course, the vibrator 30 may be only a part of the motor system, and the speaker system may additionally provide another type of magnetic circuit system to realize the up-and-down movement of the voice coil 22.

The sound production device adopts the 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 input different electric signals respectively to realize the respective work or the synchronous work without mutual influence, thereby realizing the sound production function of the loudspeaker and the function of the linear vibration motor at the same time and obtaining better tone quality effect. Compared with the loudspeaker system and the motor system sharing the voice coil or the coil, the electric signal input of the loudspeaker system and the electric signal input of the motor system are independent, so that the loudspeaker system and the motor system can not interfere with each other.

In one embodiment, the vibrator 30 includes a central magnet 32, and the magnetic poles of the central magnet 32 are distributed along the up-down direction, that is, the central magnet 32 is magnetized along the up-down direction, and the N-pole and S-pole thereof are distributed along 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 an embodiment, the vibrator 30 includes a plurality of central magnets 32, and the central magnets 32 are distributed at intervals along a moving direction of the vibrator 30 to form a first gap between two adjacent central magnets 32. The coil 41 includes a first conducting wire segment 411 and a second conducting wire segment 412 distributed along the moving direction of the vibrator 30, the first conducting wire segment 411 is disposed corresponding to one of the central magnets 32, and the second conducting wire segment 412 corresponds to the first gap. In this embodiment, the first conducting wire segment 411 corresponds to the central magnet 32, which means that the first conducting wire segment 411 is located right below the central magnet 32, and an orthographic projection of the first conducting wire segment 411 on a plane where the bottom surface of the central magnet 32 is located at least partially falls on the bottom surface of the central magnet 32. Similarly, the second conductor segment 412 is also located directly below the first magnetic gap 54.

The number of the coils 41 may also be multiple, a plurality of the coils 41 are distributed along the moving 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 moving direction of the vibrator 30.

In one embodiment, the magnetic poles of a plurality of the central magnets 32 are distributed in the same direction, and the first conducting wire segment 411 corresponds to the central magnets 32, so as to provide a lateral driving force for the central magnets 32, and the second conducting wire segment 412 corresponds to the first gap, no magnetic force line passes through the first gap, and the second conducting wire segment 412 provides substantially no lateral driving force.

In order 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 adjacently disposed and correspond to the same central magnet 32 together. Specifically, taking two adjacent coils 41 in the left-right direction as an example, the left side of the left coil 41 is the second lead segment 412, and the right side is the first lead segment 411. The first conductor segment 411 is on the left side and the second conductor segment 412 is on the right side in the right coil 41. It should be noted that, the current directions of the first conducting wire segments 411 in different coils 41 defined in the embodiments of the present invention are the same, so when the first conducting wire segments 411 in two adjacent coils 41 are disposed corresponding to the same central magnet 32, the directions of the acting forces received by the two first conducting wire segments 411 are the same, so that the central magnet 32 can be pushed to move laterally by the reaction forces in the same direction simultaneously given to the central magnet 32.

To further make the structure more compact, in an embodiment, two of the second wire segments 412 in two adjacent coils 41 correspond to the same first gap together. The center magnet 32 is provided with three pieces, and the coil 41 has four pieces, for example, wherein two first gaps are formed between the three pieces of the center magnet 32. In the left-to-right direction, the first coil 41 (i.e., the leftmost coil 41) has the first conductor segment 411 and the second conductor segment 412 distributed from left to right, and the first conductor segment 411 and the second conductor segment 412 of the adjacent coil 41 are distributed in opposite directions. The first conductor segment 411 of the first coil 41 corresponds to the first central magnet 32, the second conductor segment 412 of the first coil 41 corresponds to the first gap, the first conductor segment 411 of the second coil 41 corresponds to the second central magnet 32, the second conductor 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 central magnet 32 and the first gap, and specifically, in the same coil 41, the central magnet 32 corresponding to the first conductor segment 411 of the coil 41, and the central magnet 32 forms a sidewall of the first gap corresponding to the second conductor segment 412, so that the arrangement of the coil 41 is more compact.

Optionally, the distance between the surfaces of the two adjacent second wire segments 412 facing away from each other 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, thereby preventing the second wire segments 412 from obstructing the lateral movement of the vibrator 30.

In one embodiment, the width of the outermost central magnet 32 among the plurality of central magnets 32 is smaller than the width of any remaining central magnet 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 may be 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 central magnet 32 on the left and right sides is smaller, so that one first wire segment 411 can correspond to the central magnet, and the space is reasonably utilized.

In an embodiment, the central magnet 32 and the coil 41 are both correspondingly elongated and have the same length direction, 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 shape, which means that it has a long axis section and a short axis section, the length of the long axis section is greater than that of the short axis section, and two ends of the short axis section are respectively connected to the two long axis sections. Optionally, the length of the central magnet 32 is equal to the length of the long shaft segment, so that the two ends of the central magnet 32 are flush with the two ends of the long shaft segment, thereby ensuring that the overall structure is more compact, and simultaneously, making full use of the relative area between the two to realize the maximum driving force.

Referring to fig. 9 again, in an embodiment, the vibrator 30 further includes a mass 33, and the central magnets 32 and the mass 33 are alternately arranged. The alternating arrangement herein means: at least one mass 33 is disposed between two adjacent central magnets 32, or at least one central magnet 33 is disposed between two adjacent masses 33. In one embodiment, a central magnet 32 is disposed between two adjacent masses 33, and a mass 33 is disposed between two adjacent central magnets 32. Taking the example of three central magnets 32 forming two first gaps, the vibrator 30 in this embodiment includes two masses 33. In this embodiment, the mass 33 is a non-magnetic body and does not act as a magnet, so that no magnetic force line passes through the mass and does not act on the coil 41 below, and the mass can also serve the purpose of increasing the weight of the vibrator 30. The combined scheme can provide a strong magnetic field for both the speaker system and the motor system, and can ensure that the vibrator 30 of the motor system has enough quality, thereby taking the performances of the speaker system and the motor system into consideration.

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

The mass 33 may have a density greater than that of the central magnet 32 so that the vibrator 30 has a sufficient mass. The central magnet 32 may be a high performance magnet such as Nd-Fe-B, and the mass 33 may be a material with poor magnetic permeability but high density such as tungsten steel.

Two opposite sides of the mass block 33 can be respectively and correspondingly abutted and fixed with two adjacent central magnets 32, so that a mutually clamped structure is formed, and mutual shaking is avoided. The mass 33 and the center magnet 32 may be fixed by adhesion.

The mass block 33 and the central magnet 32 can be in a long strip shape, and the length directions of the mass block and the central magnet are the same, so that the internal space of the sound generating device can be reasonably utilized. Optionally, the lengths of the mass 33 and the central magnet 32 are equal, so that the two ends of the mass 33 are aligned with the two ends of the central magnet 32, the structure of the formed vibrator 30 is more square, 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 lateral direction and perpendicular to the moving direction of the vibrator 30.

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

In one embodiment, the vibrator 30 further includes a central magnetic plate 34, and the central magnetic 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 central magnetic conductive plate 34 has an upper magnetic conductive segment 341 covering the upper surface of the central magnet 32. In this embodiment, the central magnetic conductive plate 34 covers the entire upper surface of the central magnet 32, so as to vertically attract the magnetic force lines to the upper magnetic conductive section 341. When the mass 33 is provided, the upper magnetically permeable section 341 also covers the upper surface of the mass 33. The upper magnetically conductive section 341 may be a unitary plate covering the entire upper surface of the central magnet 32 and the mass 33. The mass 33 and the central magnet 32 may be bonded and fixed to the upper magnetic conductive segment 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, an accommodating space with a downward opening 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 two adjacent central magnets 32, the mass 33 is also disposed in the accommodating space.

The central magnet 32 and the mass 33 in the embodiment of the present invention together constitute the main structure 31 of the vibrator 30, or the central magnet 32 constitutes the main structure 31 of the vibrator 30 in the embodiment in which only the central magnet 32 is provided. The side magnetic segments 342 abut against the outer side surface of the main structure 31 so as to be able to partially or entirely cover the outer side surface of the main structure 31. Specifically, the plurality of central magnets 32 and the mass blocks 33 are alternately arranged in the left-right direction, and when the leftmost and rightmost structures are the central magnets 32, the side magnetic guiding segments 342 are abutted against the outer side surfaces of the leftmost central magnet 32 and the rightmost central magnet 32, and the side magnetic guiding segments 342 can completely cover or partially cover the same outer side surface of the central magnet 32. When the structures at the leftmost side and the rightmost side are the mass blocks 33, the side magnetic guiding segments 342 are abutted against the outer side surfaces of the mass blocks 33 at the leftmost side and the rightmost side, and similarly, the side magnetic guiding segments 342 can completely cover or partially cover the same outer side surface of the mass blocks 33. Similarly, in other cases, the side magnetic segments 342 are correspondingly abutted against the outer side surfaces of the corresponding structures. In the embodiment where the mass 33 is not provided, the side magnetic segments 342 abut against the outer side surface of the central magnet 32.

The central magnetic conductive plate 34 may have two side magnetic conductive segments 342, the two side magnetic conductive segments 342 are correspondingly connected to two opposite sides of the upper magnetic conductive segment 341, so as to form an accommodating space together with the upper magnetic conductive segment 341, and the two side magnetic conductive segments 342 are correspondingly abutted to two opposite side surfaces of the main body structure 31. In this embodiment, the central magnetic conductive plate 34 is substantially a U-shaped plate structure, and the U-shaped opening faces downward to enclose the central magnet 32 and the mass 33. The central magnet 32 may be fixed to the central magnetic conductive plate 34 by bonding or welding, or may be fixed by screwing or other methods.

When the two side magnetic conductive segments 342 are disposed, the two side magnetic conductive segments 342 are distributed along the moving direction of the vibrator 30, so that the two side magnetic conductive segments 342 clamp the central magnet 32 and the mass 33 along the distribution direction of the plurality of central magnets 32 and the mass 33, so that the central magnet 32 and the mass 33 are clamped to each other.

The side magnetic sections 342 can play a role in concentrating magnetism, and can increase the contact area with the central magnet 32, so that the connection between the central magnet 32 and the central magnetic plate 34 is more stable, the central magnet 32 can be clamped between the two side magnetic sections 342, and the two side magnetic sections 342 provide clamping force, thereby further preventing the central magnet 32 and the mass block 33 from falling.

In other embodiments, four side magnetic segments 342 may be provided, wherein two opposite side magnetic segments 342 completely cover the corresponding side of the main body structure 31 and the other two opposite side magnetic segments 342 only cover a portion of the corresponding side of the main body structure 31. Alternatively, two other side magnetic segments 342 are disposed on the side of the mass 33, avoiding the central magnet 32.

The central magnetic conductive plate 34 itself may be an integral structure, and the side magnetic conductive section 342 and the upper magnetic conductive section 341 are integrated, that is, the side magnetic conductive section 342 and the upper magnetic conductive section 341 are integrally bent through 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 additionally assembled together. Of course, in another embodiment, the side magnetic conducting segment 342 and the upper magnetic conducting segment 341 may be a separate structure, and the side magnetic conducting segment 342 and the upper magnetic conducting segment 341 are welded or bonded.

In the invention, the central magnetic conduction plate 34 is integrally bent to form an accommodating space, specifically, the central magnetic conduction plate 34 is bent at two ends of the vibrator 30 in the moving direction to form a tray structure, and the central magnet 32 and the mass block 33 are accommodated to form the motor vibrator 30 together, so that the total mass of the vibrator 30 can be increased, and a mutually embedded structure can be formed under the clamping of the two side magnetic conduction sections 342, thereby ensuring the combination firmness of the central magnetic conduction plate 34, the central magnet 32 and the mass block 33, and facilitating the welding of the whole vibrator 30 and the elastic support member 35.

In an embodiment, the elastic supporting members 35 are fixed to the side magnetic guiding segments 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 guiding segments 342. Thus, the elastic supporting member 35 is connected to the mounting structure (i.e. the central magnetic conductive plate 34) at the periphery of the vibrator 30, which is beneficial to realize the integral movement of the vibrator 30.

Referring to fig. 13, in an 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 side magnetic segments 342 is greater than the height of main structure 31 (the main structure 31 refers to central magnet 32 or mass 33, or to the combined structure of central magnet 32 and mass 33), so that the bottom surface of side magnetic segments 342 is lower than the bottom surface of main structure 31, i.e., the bottom surface of side magnetic segments 342 extends downward beyond the bottom surface of main structure 31.

When the sound generating device falls downward, the vibrator 30 moves relative to the coil 41 at the bottom (i.e., the side of the lower cover 642), and the bottom surface of the vibrator 30 easily collides with the coil 41 or the lower cover 642. When the bottom surface of side magnetic section 342 is disposed to extend downward beyond the bottom surface of main structure 31 so that vibrator 30 collides with coil 41 or lower cover 642, a space is always maintained between the bottom surface of main structure 31 and coil 41 by side magnetic section 342 colliding with coil 41 or lower cover 642. In this way, in a form in which only the side magnetic segment 342 comes into contact with the coil 41 as opposed to the entire bottom surface of the vibrator 30 colliding with the coil 41, the contact area between 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 phenomenon that the internal structure of the vibrator 30 shakes excessively and loosens due to excessively large inertia impact force is avoided, 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 conduction sections 342 are provided and the two side magnetic conduction sections 342 are respectively arranged at two opposite sides of the main body structure 31, because the two side magnetic conduction sections 342 both exceed the bottom surface of the main body structure 31, when the vibrator 30 falls down, the two opposite sides of the whole vibrator 30 are contacted with the lower casing 60 or the coil 41 through the two side magnetic conduction 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 magnetic segments 342, and an orthographic projection of the coil 41 on the central magnetic conductive plate 34 falls between the two side magnetic segments 342. In this way, when transducer 30 falls down, side magnetic section 342 is in contact with the bottom wall of case 60, avoiding coil 41, and side magnetic section 342 will not press on coil 41, thus avoiding damage to coil 41.

Optionally, the vertical distance between the bottom surface of the central magnetic conductive plate 34 and the bottom wall of the casing 60 is smaller than the vertical distance between the bottom surface of the main structure 31 and the upper surface of the coil 41. The bottom surface of the central magnetic conductive plate 34 is referred to herein as the bottom surface of the side magnetic conductive segment 342, and the vertical distance between the bottom surface of the side magnetic conductive segment 342 and the bottom wall of the casing 60 is smaller than the vertical distance between the bottom surface of the main structure 31 and the upper surface of the coil 41. In this manner, when the bottom surface of side magnetic segment 342 contacts the bottom wall of case 60, the bottom surface of main structure 31 is still spaced from the upper surface of coil 41, thereby completely avoiding the impact of vibrator 30 on coil 41.

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

In the case of the embodiment in which the oscillator 30 is formed by the external magnetic circuit system, the oscillator 30 may have the central magnet 32 and the central magnetic conductive plate 34.

Referring to fig. 9, 14 and 15, in an embodiment, the bottom surface of the coil 41 is further provided with a lower magnetic conductive plate 42, so that the magnetic lines of force can be attracted to the lower magnetic conductive plate 42 vertically, and the lower magnetic conductive plate 42 can also support the coil 41. Wherein, the lower magnetic conductive plate 42 can cover the whole 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 and an external circuit. In addition, the circuit board 43 may be connected to the voice coil 22 to connect the voice coil 22 to an external circuit. Optionally, the circuit board 43 is mounted to the lower magnetically permeable plate 42. Specifically, the lower magnetic conducting plate 42 is provided with at least one limiting notch 421, the circuit board 43 is provided with an inserting plate 431, and the inserting plate 431 is inserted into the limiting notch 421 so as to limit the circuit board 43 to move. After the 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 space occupation in the vertical direction is reasonably utilized, and the excessive thickness of the whole circuit board is avoided. In this embodiment, the inserting plate 431 can be regarded as a part of the lower magnetic conducting plate 42, so as to cover the entire lower surface of the coil 41.

Referring to fig. 16 and 17, in an embodiment, the vibrator 30 and the coil 41 are spaced apart from each other in the vertical direction, and in order to suspend the vibrator 30 above the coil 41, the sound generating apparatus further includes an elastic support 35, and the elastic support 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 elastic deformation in the moving direction of the vibrator 30, thereby ensuring that the vibrator 30 can move in the lateral direction.

The resilient support 35 may be fixed to the frame 11, the lower magnetic plate 42 or some other connecting structure so as to prevent itself from moving in the lateral direction, but only deform in the lateral direction.

Specifically, the elastic support 35 includes a connection arm 351 having a bent shape and two elastic arms 352 connected to the connection arm 351, the connection arm 351 is formed by bending along a folding line perpendicular to the moving direction of the vibrator 30, in this embodiment, the folding line is in the up-down direction, the two elastic arms 352 are distributed at intervals along the moving direction of the vibrator 30, one of the elastic arms 352 is connected to the vibrator 30, specifically, the elastic arms 352 may be fixed by welding or other methods, and the other elastic arm 352 is fixed to the frame 11. The other elastic arm 352 is fixed relative to the frame 11, that is, it is fixed with the frame 11, or fixed with the frame 11 by other structural members, or the elastic arm 352 is fixed to other connecting structures, and the connecting structures are fixed relative to the frame 11. For example, the spring arm 352 may be fixed to any one of the housing 60, the lower magnetic plate 42, or the side magnetic system. Furthermore, the elastic support 35 may also be a spring. The crease of the connecting arm can also be a direction which is vertical to the motion direction of the vibrator in the horizontal direction.

In order to improve the motion stability of the vibrator 30, in an embodiment, the sound generating device includes two elastic supporting members 35, and the two elastic supporting members 35 are respectively disposed on two opposite sides of the vibrator 30 along the motion direction of the vibrator 30. Due to the arrangement of the two elastic supporting pieces 35, the two opposite sides of the vibrator 30 are stressed, and the stress of the vibrator 30 is more balanced, so that the stability of the vibrator 30 in motion is realized, and the shaking of the vibrator 30 in the up-down direction is reduced. Moreover, the two elastic supporting members 35 can support the vibrator 30 together, so that the bottom surface of the vibrator 30 is prevented from contacting the coil 41, the coil 41 can be prevented from obstructing the reciprocating movement of the vibrator 30, and the vibrator 30 can be prevented from colliding and damaging the coil 41.

For example, when transducer 30 moves laterally to the left, transducer 30 presses left elastic support 35, such that elastic arm 352 connected to the left elastic support 35 moves to the side where the other elastic arm 352 is located, and left elastic support 35 is compressed. Meanwhile, with respect to the right-side elastic support 35, the elastic arm 352 adjacent to the vibrator 30 is pulled toward the left side by the vibrator 30, and is moved away from the other elastic arm 352, so that the right-side elastic support 35 is stretched. On the contrary, when the vibrator 30 moves laterally to the right, the right elastic support 35 is compressed, and the left elastic support 35 is stretched. Thus, the vibrator 30 moves back and forth between the left and right elastic supports 35, and the left and right elastic supports 35 suspend the vibrator 30 above the coil 41, and give a reverse acting force to the vibrator 30, thereby restoring the vibrator 30.

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 magnet, 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 shared by the speaker system and the motor system is taken as an example, in this embodiment, the vibrator 30 is a shared part of the speaker system and the motor system, and the vibrator 30 can drive the voice coil 22 to move up and down and can realize the lateral movement of itself by interacting with the coil 41. In this way, the weight of the magnet can be used as the motor oscillator 30 while sharing the magnetic field and the magnetic force, and a great 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 extends into the magnetic gap 54, and the voice coil 22 is subjected to magnetic field forces 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, an internal magnetic circuit system forms the vibrator 30, said external magnetic circuit system being fixed with respect to said frame 11. In contrast, in one embodiment, the external magnetic circuit system forms a vibrator 30, and the internal magnetic circuit system is fixed relative to the frame 11.

In the following description, the inner magnetic circuit system is used to constitute the transducer 30, and the transducer 30 serves as the inner magnetic circuit system of the speaker system, and the outer magnetic circuit system may be disposed around the transducer 30 to form the circumferential magnetic gap 54. The external magnetic circuit system may be an integral ring structure, or may be formed by a plurality of structures provided at intervals in the circumferential direction of vibrator 30. In one embodiment, magnetic gap 54 formed between the external magnetic circuit system and transducer 30 is not annular, e.g., two magnetic gaps 54 are formed therebetween, and two magnetic gaps 54 are disposed on opposite sides of transducer 30.

In one embodiment, the external magnetic circuit system includes a plurality of side magnets 51, wherein the number of the side magnets 51 may be multiple, and a plurality of side magnets 51 are spaced along the circumference of the vibrator 30 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, side magnet 51 is provided so as to avoid the movement path of oscillator 30, and thus, oscillator 30 can be ensured to have a sufficient movement space, and interference with oscillator 30 can be avoided. The magnetic poles of the side magnets 51 are distributed in the vertical direction and form a magnetic circuit in combination with the center magnet 32.

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

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

In the embodiment of the transducer 30, which is a part of the magnet shared by the speaker system and the motor system, since the voice coil 22 extends into the magnetic gap 54 between the transducer 30 and the external magnetic circuit system, the voice coil 22 has a part of the structure at the same height as the transducer 30, and in this case, the vibration system, the transducer 30, and the coil 41 are distributed in order in the up-down direction means that the diaphragm 21, the transducer 30, and the coil 41 are distributed in order in the up-down direction.

In the case where a separate magnet is used for each of the speaker system and the motor system, the transducer 30 is not included as a part of the speaker system and does not participate in the up-and-down movement of the voice coil 22, and the sound generating apparatus additionally includes an internal magnetic circuit system, and a magnetic gap 54 is formed between the internal magnetic circuit system and the external magnetic circuit system to accommodate the voice coil 22. Wherein the inner magnetic circuit system and the outer magnetic circuit system are located above or on 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 is along the vibration direction of the vibration system, and the following description will be made in detail by using two different embodiments.

Referring to fig. 5 and 18, in an 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 along the transverse direction, for example, the axial direction of the voice coil 22 may be parallel to the second horizontal direction. In the present embodiment, the voice coil 22 is a flat voice coil 22, and the flat structure of the flat voice coil 22 means that the flat voice coil 22 is flat in the axial direction thereof. 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 a conductive wire, and the number of conductive wire layers in the axial direction of the flat voice coil 22 is smaller than the number of conductive wire coils 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, i.e., wound in the radial direction. The height of the flat voice coil 22 in the axial direction thereof is small, for example, in the axial direction thereof, the number of layers formed by winding the conductive wire of the flat voice coil 22 may be one or a small number of layers, so that the thickness of the flat voice coil 22 in the axial direction is small; and along self radial direction, the number of turns that the electrically conductive wire material of flat voice coil 22 was around establishing formation is more for the width that many circles of electrically conductive wire material formed jointly is great, thereby makes flat voice coil 22 form that axial thickness is little, the big flat structure of radial width.

The flat voice coil 22 may be substantially racetrack shaped and have two opposing third wire segments 221, the third wire segments 221 being the long axes of the flat voice coil 22. Wherein, the two third wire segments 221 are distributed at intervals along the up-down direction.

Adopt flat voice coil 22, and flat voice coil 22's axial perpendicular to vibration system's vibration direction, the space that flat voice coil 22 took in the axial is less, so can reduce the width of magnetic gap 54, the space that magnetic gap 54 took diminishes promptly, thereby the corresponding inner space who has saved sound generating mechanism, make the inside space holding magnet that has more of sound generating mechanism, so can improve its acoustic performance through increasing magnet size, promptly 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 range bigger.

The sound generating device may have two voice coils 22, the two voice coils 22 are respectively disposed on two opposite sides of the vibrator 30, and the two voice coils 22 are distributed in a direction perpendicular to the moving 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-back direction. In this embodiment, voice coil 22 is disposed to avoid the movement path of transducer 30, so that interference with the movement of transducer 30 can be avoided. In this embodiment, the sound generating device has two side magnets 51, the two side magnets 51 are respectively disposed on two 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 respectively disposed in the two magnetic gaps 54. Obviously, the side magnets 51 are not provided on the left and right sides of the vibrator 30, so that the space on the left and right sides of the vibrator 30 is large, and the space can be used for placing the elastic support 35; on the other hand, sufficient space for the vibrator 30 to move right and left is also secured.

In one embodiment, the voice coil 22 is in an elongated shape, and the length direction of the voice coil is along the motion direction of the vibrator 30. In this embodiment, the magnetic gap 54 is elongated, the longitudinal direction thereof is along the left-right direction, the width direction thereof is along the front-back direction, the major axis of the flat voice coil 22 is along the longitudinal direction of the magnetic gap 54, the minor 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 is designed and the flat voice coil 22 is correspondingly adopted, so that the internal space of the sound generating device is saved, and the acoustic performance can be improved by increasing the sizes of the side magnet 51 and the central magnet 32.

In one embodiment, transducer 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, voice coil 22 faces the second sides, and an end of 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 surface, so that the third wire segment 221 can extend beyond the first side surface, and thus, the short axis segment of the voice coil 22 is located outside the magnetic gap. After setting up like this, can conveniently be connected with support 23, support 23 can set up in the one side at first side place to with there is the clearance between the first side, and avoid setting directly over oscillator 30, when support 23 up-and-down motion under the drive of voice coil 22, can avoid support 23 to contact with oscillator 30 in the up-and-down direction, thereby avoid oscillator 30 to cause the interference to the motion of support 23.

Since magnetic gap 54 needs to be formed between transducer 30 and side magnet 51, side magnet segment 342 should be disposed to avoid the side where side magnet 51 is located, and side magnet 51 faces the surface of transducer 30 where side magnet segment 342 is not disposed. In a specific embodiment, the main body structure 31 has two first side surfaces and two second side surfaces, the two first side surfaces are disposed oppositely, the two second side surfaces are disposed oppositely, the two first side surfaces have side magnetic guiding sections 342, the side magnet 51 is disposed facing the second side surfaces, and a gap between the side magnet 51 and the second side surfaces forms a magnetic gap 54, and the two voice coils 22 are disposed on the two second side surfaces respectively. In other embodiments, the second side surface may be provided with a side magnetic segment 342, and the side magnetic segment 342 only partially shields the second side surface. For example, the side magnetic segments 342 are shielded from the surface of the mass 33.

Referring to fig. 20 and 22, in addition, the sound generating device may further include a bracket 23, where the bracket 23 is connected to the diaphragm 21 and the voice coil 22, respectively, so 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, the distribution direction of the two brackets 23 is the same as the movement direction of the vibrator 30, the brackets 23 extend along the distribution direction of the two voice coils 22 to form a long strip shape, and the same bracket 23 connects the two voice coils 22. Therefore, two supports 23 are respectively connected to two ends of the voice coil 22, and the two supports 23 support the voice coil 22, so that the stability of the voice coil 22 during up-and-down movement can be greatly improved.

The support 23 includes a first connecting section 231 and two second connecting sections 232 respectively disposed at two ends of the first connecting section 231, wherein the two second connecting sections 232 both extend downward, one of the second connecting sections 232 is connected to one of the voice coils 22, and the other second connecting section 232 is connected to 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 section 232 is connected to the voice coil 22, and the voice coil 22 is located at the outer side of the vibrator 30, it can be seen that the first connection section 231 crosses over the vibrator 30, and the vibrator 30 is located between the two second connection sections 232, so that interference to the movement of the vibrator 30 can be avoided. Alternatively, the first connection section 231 is positioned above the vibrator 30, so that interference with the movement of the vibrator 30 can be completely prevented. In addition, 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. Referring to fig. 16, both ends of the voice coil 22 extend from the magnetic gap 54, and the second connecting portion 232 of the bracket 23 is connected to the end of the voice coil 22 extending 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 an arc-shaped bulge 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 damper 24 employs a combination of the above, in which the FPCB and the auxiliary support film are disposed in the up-down direction. In this embodiment, the centering branch piece adopts the FPCB structure. The damper 24 includes a fixing section 241 and a supporting section 242 that are elastically connected, the supporting section 242 can elastically move relative to the fixing section 241, and the fixing section 241 is fixed relative to the frame 11, so that the damper 24 is mounted and positioned, the damper 24 is prevented from moving, and the damper does not participate in the vibration of the diaphragm 21. The supporting section 242 is coupled to at least one of the voice coil 22, the diaphragm 21 and the support 23, so as to stabilize the vibration system and prevent the vibration from swinging as the central portion of the diaphragm 21 moves up and down relative to the fixing section 241 when the diaphragm 21 moves up and down. In embodiments where support segment 242 is coupled to diaphragm 21, support segment 242 is coupled to a center portion or dome on a center portion of diaphragm 21.

Centering disk 24 can set up the downside at support 23, and the downside of support 23 is supported by centering disk 24, and joint strength is high to make support 23's motion more steady, the centering is strong, even the stability that gets voice coil 22 is better, and vibrating diaphragm 21's vibration range is more even, can avoid vibrating diaphragm 21 to produce the polarization, can effectively reduce the noise, helps improving sound generating mechanism's tone quality. In addition, the sound generating device may include two centering pads 24, and the two centering pads 24 are spaced apart from each other along the moving direction of the vibrator 30, so that the two opposite sides of the diaphragm 21 are stressed more evenly. Wherein, the two centering support pieces 24 are correspondingly connected with the two brackets 23 one by one; alternatively, both the centering buttresses 24 are connected to a diaphragm or a voice coil.

The centering branch piece 24 can have two supporting sections 242, the two supporting sections 242 are distributed at intervals along the length direction of the support 23 and correspond to the two ends of the connecting support 23, so that the two ends of the support 23 are supported, the up-and-down movement of the support 23 is more stable, and the generation of the polarization phenomenon is greatly reduced.

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

The fixing section 241 of the centering branch piece 24 can be connected to the frame 11, the upper magnetic conductive plate 52 or other structures on the sound generating device, and the description will be given by combining the fixing section 241 with the bottom surface of the upper magnetic conductive plate 52. The fixing section 241 may be a long plate extending 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 fixing section 241 is disposed on the upper magnetic conductive plate 52 at a side not connected with the side magnetic conductive section 521. The supporting section 242 protrudes inward from the inner side of the upper magnetic conductive plate 52 and is suspended in the gap between the upper magnetic conductive plate 52 and the vibrator 30, so that the vibrator 30 moves between the two centering branch pieces 24. In addition, two supporting segments 242 are spaced apart along the length of the fixing segment 241.

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

In the above, the bracket 23 further includes the third connection section 233, 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 damper 24. The end of the third connecting section 233 can be bent transversely to form a flange, which can have a larger connecting area with the top surface of the centering branch piece 24. In addition, the bracket 23 is provided with one third connecting section 233 corresponding to each of the two support sections 242.

Referring to fig. 19, in an 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, voice coil 25 may be wound around the outside of transducer 30, so that transducer 30 moves in the space enclosed by voice coil 25, and the space inside voice coil 25 may be fully utilized, resulting in a more compact structure. For common transducer 30, voice coil 25 is positioned within a magnetic gap 54 formed between transducer 30 and the external magnetic circuit system. In the present scheme, the voice coil 25 is designed to surround the vibrator 30, and the moving direction of the voice coil 25 is the same as the axial direction thereof.

Alternatively, in the moving direction of the vibrator 30 (i.e., the first horizontal direction), the voice coil 25 has two opposite minor-axis sides 251, the minor-axis sides 251 of the voice coil 25 have a first spacing from the vibrator 30, and in the horizontal direction perpendicular to the moving direction of the vibrator 30 (i.e., the second horizontal direction), the voice coil 25 has two opposite major-axis sides 252, and the major-axis sides 252 of the voice coil 25 have a second spacing from the vibrator 30, the first spacing being greater than the second spacing. In this way, since the first pitch is large in the moving direction of vibrator 30, vibrator 30 can be moved with a sufficient space secured. And in the horizontal direction perpendicular to the moving direction of the vibrator 30, the second distance is smaller, and the vibrator 30 does not need to move in the direction, so that the waste of the space at the position can be avoided, and the structure is more compact.

The first spacing is much larger than the second spacing, e.g., the first spacing is greater than or equal to twice the second spacing, taking into account the motion of the transducer 30.

In an embodiment, the first distance is greater than or equal to 0.4mm and less than or equal to 1.0mm, which may provide a sufficient movement space for the movement of the vibrator 30, and may also avoid the movement space being too large to cause the overall size to be too large.

In an embodiment, the second distance is greater than or equal to 0.05mm and less than or equal to 0.15mm, which can prevent the vibrator 30 from contacting the voice coil 25 during movement, and can also prevent the gap in the direction of the second distance from being too large, which results in large space waste of the whole machine.

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 central magnet 32. In order to avoid interference with the side magnets 51 during movement of the vibrator 30, in another embodiment, the external magnetic circuit system includes only two side magnets 51, which are disposed corresponding to both long-axis sides of the voice coil 25.

In combination with the centering support 24 and the support 23, in the present embodiment, the support 23 also connects the diaphragm 21 and the voice coil 25, and the support 23 can be connected to the peripheral side or the end face of the voice coil 25. The damper 24 may be directly attached to the end face of the voice coil 25, or the damper 24 may be attached to the holder 23.

In order to prevent the voice coil 25 from 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 adjacent to 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 formed at the same height in the vertical direction, the voice coil 25 does not hinder the deformation of the elastic support 35 because the elastic arm 352 and the voice coil 25 are spaced apart in the lateral direction and the extension arm 353 connected to the vibrator 30 is located below the voice coil 25. Optionally, extension arm 353 is attached to the free end of spring arm 352. Further, 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, the sound generating device in the embodiment of the present invention may be a speaker unit. The speaker unit has a rectangular structure as a whole, and specifically, a rectangular frame 12 (both

parts

121 and 122 are taken as the frame 12 in the figure) forms a structure with two open ends, and the edge part of the diaphragm 21 is fixed on the upper end face of the frame 12 and hermetically covers the upper end opening. The lower end of the frame 12 is provided with a bottom plate corresponding to the shape of the frame 12 and enclosing together to form an accommodating space, the frame 12 and the bottom plate together form a peripheral frame structure of the speaker system and the motor system, the voice coil 22, the vibrator 30 and the coil 41 are all installed in the accommodating space, and the coil 41 is fixed on the bottom plate.

In one embodiment, the lower magnetic conductive plate 42 is located 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 outer 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 outer magnetic circuit system includes the edge magnet 51, the edge magnet 51 is fixed to 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 magnetic concentration effect on the edge magnet 51. The difference between the lower magnetic conductive plate 42 in this embodiment and the lower magnetic conductive plate 42 in the module is that the lower magnetic conductive plate 42 covers the entire bottom surface of the frame 12 to prevent other internal structures from falling out.

In addition, the outer magnetic circuit system further includes an upper magnetic conduction plate 52, the upper magnetic conduction plate 52 may also be disposed in the accommodating space, and the upper magnetic conduction plate 52 is located on the top surface of the edge magnet 51. An upper magnetic conductive plate 52 may be disposed corresponding to the top surface of each edge magnet 51, and of course, the upper magnetic conductive plate 52 may also be ring-shaped. In addition, the frame 11 may be divided into upper and 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 fixed to the frame 12, for example, a resilient arm 352 of the resilient support 35 is fixed to an inner side of the frame 12, so as to prevent the resilient support 35 from moving relative to the frame 12. The elastic support member 35 is welded to the frame 12, or the elastic support member 35 is bonded to the frame 12, or the elastic support member 35 is clamped to the frame 12 or connected to the frame 12 by screws.

In an embodiment, the fixing section 241 of the supporting core 24 is fixed to the frame 12, and specifically, the fixing section 241 of the supporting core 24 may be connected to the inner side of the frame 12, or a fixing gap is formed in the frame 12, and the fixing section 241 of the supporting core 24 is installed in the fixing gap and plugs the fixing gap to prevent the fixing gap from leaking water.

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, an edge of the diaphragm 21 is fixed to an upper end of the first frame 121, and a bottom plate is fixed to a lower end of the second frame 122. The structure that the first frame body 121 and the second frame body 122 are arranged separately is adopted, so that the independent processing of each part is facilitated, and the processing difficulty of each part can be reduced. In addition, the first frame body 121 and the second frame body 122 may be made of different materials, and in a specific embodiment, the first frame body 121 is made of a plastic material and may be integrally injection-molded with an edge of the diaphragm 121; the second frame 122 is made of metal to realize 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 apparatus further includes a front cover abutting on an 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 a middle portion of the front cover. Of course, in other embodiments, the sound generator may not include a front cover.

This scheme is through designing sound generating mechanism for the mode of similar speaker monomer, does not carry out physics to sound generating mechanism's preceding sound chamber 61 and back sound chamber 62 and separates. The sound generating device can be directly installed in a whole machine for application in a single form or installed in a Box body (SPK Box) for application in a kernel form, and the application mode is relatively flexible.

In some embodiments, the frame 12 may be formed by the edge magnet 51, the edge magnet 51 itself and the internal magnetic circuit system together form a magnetic field for driving the voice coil 22 to move up and down, and the edge magnet 51 may also function as the frame 12, so as to reduce the number of components and simplify the installation.

In some embodiments, the structure of the housing 60 can also refer to the frame 12 and the bottom plate, the housing 60 can 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 cell.

Referring to fig. 1, 6, 24 and 25 in combination, the sound generating device in the embodiment of the present invention may be in a module form, that is, the sound generating device may further include a housing 60, the housing 60 forms an installation space, the vibration system, the vibrator 30 and the coil 41 are installed in the installation space, and the installation space is partitioned into a front sound cavity 61 and a rear sound cavity 62, the front sound cavity 61 is formed on the upper side of the diaphragm 21. Usually, the cavity wall of the front acoustic cavity 61 is provided with an acoustic hole 69 to communicate with the opening of the whole device, so as to realize the transmission of sound.

By housing the structure of the vibration system, the vibrator 30, the coil 41, and the like in the housing 60 after the housing 60 is provided, it is possible to avoid collision damage of these structures. Meanwhile, the integral 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 which are separately provided, and the upper case 63 and the lower case 64 together enclose an installation space. In one embodiment, the lower shell 64 has a cavity that opens upwardly, and the upper shell 63 covers the opening of the lower shell 64. The lower casing 64 may further include a middle frame 641 and a lower cover 642, wherein the middle frame 641 is annular, the lower cover 642 covers the lower opening of the middle frame 641, and the upper casing 63 is disposed at the upper end of the middle frame 641 and can cover the upper opening of the middle frame 641.

In one embodiment, a limit rib 633 is integrally bent at a side edge of the upper housing 63, and the limit rib 633 abuts against an outer side surface of the middle frame 641, so as to limit the movement of the upper housing 63. A plurality of stopper ribs 633 are provided at the side edge of the upper case 63 at intervals in the circumferential direction, and abut against the center 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 center frame 641.

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

Optionally, the housing 60 is a metal member, the metal housing 60 has a good heat dissipation effect, and meanwhile, a fixing structure connected with other structures can be integrally formed. In this embodiment, the upper case 63, the middle frame 641, and the lower cover 642 are all made of metal, so that heat generated by the system during the electromagnetic conversion process can be well conducted and distributed, 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 also be directly processed by the metal part, so that a better fixing effect is achieved.

In one embodiment, the sound generator further comprises a frame 11, and the frame 11 is mounted to the housing 60. In an embodiment, referring to fig. 7, the housing 60 is formed 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 arranged 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 where the lower housing 64 is divided into the middle frame 641 and the lower cover 642, the installation gap is formed by the upper housing 63 and the middle frame 641. Taking the installation gap opened at the upper end of the middle frame 641 as an example, 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 to the lower end of the upper shell 63 through the vibrating diaphragm 21, and the lower end of the frame 11 is connected to the upper end of the middle frame 641 in a sealing manner, that is, the frame 11 can fill the installation gap to avoid water leakage.

After the installation gap is arranged, on one hand, the upper and lower limiting effect can be achieved on the frame 11; on the other hand, after the frame 11 is inserted into the mounting notch, the space formed in the middle of the frame 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 covering the frame 11 is inevitably larger, and the diaphragm 21 can fully utilize the inner space of the housing 60 to increase the effective vibration area of the amplifier.

In other embodiments, for a 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 on the housing 60, and the housing 60 also serves as a frame structure. In addition, in other embodiments, the frame 11 may be fixed to the inner side of the housing 60.

In the embodiment where the upper magnetic conductive plate 52 is annular, the upper magnetic conductive plate 52 can also be installed in the installation notch, so that the lower end of the frame 11 abuts against the upper surface of the upper magnetic conductive plate 52, the lower surface of the upper magnetic conductive plate 52 abuts against the upper end of the lower shell 64, and the installation notch is filled with the upper magnetic conductive plate and the lower magnetic conductive plate.

In the embodiment of the present invention, the fixing section 241 of the supporting core 24 can be mounted to the casing 60, for example, can be mounted to the mounting notch, and the supporting core 24 can be clamped between the upper magnetic conducting plate 52 and the lower casing 64.

In this embodiment, the edge magnet 51 is located inside the casing 60, and the lower magnetic conductive plate 53 is also located inside the casing 60.

In one embodiment, the ring formed by the frame 11 is smaller than the ring formed by the lower shell 64, so that a portion of the frame 11 is located in the installation notch, and another portion is located in the installation space. In addition, the axis of the upper magnetic conduction plate 52 coincides with the axis of the frame 11, and the size of the ring formed by the two magnetic conduction plates can be consistent.

This scheme can be with frame 11 and the form of shell 60 direct design as an organic whole, separates and seals the preceding sound chamber 61 and the back sound chamber 62 of sound generating mechanism product, prevents the short circuit of sound chamber 62 sound wave around, promotes sound generating mechanism's tone quality and volume. And the design is that the module structure can use the space fully, and the frame 11 extends into the mounting notch of the housing 60, so that the radiation area (Sd) of the diaphragm 21 can be enlarged, and the acoustic performance of the product can be improved.

In the above, the lower magnetic conductive plate 42 at the bottom of the coil 41 can be fixed on the bottom surface of the casing 60, so as to realize the relative fixation between the coil 41 and the frame 11. The lower magnetic conductive plate 42 and the casing 60 can be fixed by welding or bonding.

The lower magnetic conductive plate 53 may be disposed on the bottom surface of the casing 60 and supported by the casing 60.

The elastic supporting element 35 may be fixed to the casing 60, for example, one elastic arm 352 of the elastic supporting element 35 is fixed to the inner side of the casing 60, specifically, the inner side of the middle frame 641, so as to prevent the elastic supporting element 35 from moving relative to the casing 60 and the frame 11. The elastic support member 35 and the housing 60 are welded and fixed, or the elastic support member 35 and the housing 60 are bonded and fixed, or the elastic support member 35 and the housing 60 are clamped and fixed, or are connected by screws, and the like.

Referring to fig. 8 and 27, 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 mounting hole 65 is sealed and covered by the flexible deformation portion 70.

When the diaphragm 21 vibrates, the sound pressure inside the rear acoustic cavity 62 changes, and the flexible deformation portion 70 deforms with the change of the sound pressure inside the rear acoustic cavity 62, so as to flexibly adjust the volume of the rear acoustic cavity 62.

Further, a protective cover plate 80 located outside the flexible deformation portion 70 is further arranged on the mounting hole 65, and an avoiding space for avoiding 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 of a metal sheet, an FR-4 sheet, a PET sheet, a PEN sheet, a carbon fiber sheet, and a ceramic sheet, and has a certain hardness and strength, and can protect the inner flexible deformation portion 70. As a specific embodiment, the protective cover 80 is made of stainless steel with high strength and is not easily corroded. The high intensity of the protective cover plate 80 can be very thin, for example, the thickness of the protective cover plate 80 is less than or equal to 0.2mm, even less than or equal to 0.1mm, so that the protective cover plate 80 does not occupy the space of the Z axis (i.e. the up-down direction) of the product too much, and the damage or the film breaking problem of the flexible deformation part 70 caused by the external environment can be avoided in the transportation or assembly process.

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

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

Specifically, the area of each air hole 81 in the invention can be less than or equal to 0.2mm²So that under the condition that can not influence the intensity of protective cover plate 80, bleeder vent 81 can prevent that liquid and impurity from invading the space between protective cover plate 80 and the flexible deformation portion 70, avoids causing the influence to the performance and the life of flexible deformation portion 70, and then can need not attach dustproof screen cloth on protective cover plate 80, can reduce material cost and equipment process to save product Z axle space.

The shape of the vent 81 is not limited, and may be any shape design such as circular, square, oval, and the like. In this embodiment, the air holes 81 are circular holes, and the aperture of the air holes 81 is less than or equal to 0.5mm to satisfy the requirement that the hole area is less than or equal to 0.2mm². Optionally, the aperture of the air hole 81 is less than or equal to 0.3 mm. For example, the aperture is 0.3mm, so that better dustproof and waterproof effects can be achieved, and the difficulty and cost for manufacturing the micropores are relatively low.

Further, the distance between the edges on the center connecting line of the two adjacent air holes 81 is greater than or equal to 0.3mm and less than or equal to 1 mm. Specifically, the thickness may be 0.4mm, 0.5mm, 0.6mm, 0.7mm, or the like, and the strength and the processing cheapness of the protective cover plate 80 are both considered. The distance between the edges on the center connecting line of the two adjacent air holes 81 refers to the distance between the two adjacent air holes 81.

The specific structure of the protective cover plate 80 may be: including a fixing wall 82, a protection wall 83, and a connection wall 84, the fixing wall 82 and the protection wall 83 are connected by the connection wall 84, and the fixing wall 82 surrounds the outer side of the protection wall 83. The fixed wall 82 and the protection wall 83 are located on different planes, the fixed wall 82 is close to the flexible deformation portion 70 relative to the protection wall 83, the fixed wall 82 is fixed on the housing 60, an avoiding space is formed between the protection wall 83 and the flexible deformation portion 70, the ventilation holes 81 are formed in the protection wall 83 and/or the connection wall 84, for example, the ventilation holes 81 are simultaneously formed in the fixed wall 82 and the protection wall 83.

For convenience of installation, the wall of the housing 60 and the wall of the mounting hole 65 may be recessed toward the rear sound cavity 62 to form a sinking groove 66, the sinking groove 66 is disposed around the mounting hole 65, and the fixing wall 82 is fixed on a groove bottom 661 of the sinking groove 66, which may be fixed by glue or double-sided glue.

As a specific example, the edge 73 of the flexible deformation portion 70 is connected to the fixed wall 82 of the protective cover 80 and then fixed to the groove bottom 661 of the sinking groove 66. Combine flexible deformation portion 70 earlier to protective cover plate 80 on, flexible deformation portion 70 material is softer, and protective cover plate 80 has played the effect of supporting the design to flexible deformation portion 70, can avoid flexible deformation portion 70 to lead to the size unusual because of warping, arouses the performance bad, has optimized the equipment technology again, can realize automatic feeding, has improved production efficiency.

As another example, the protective cover 80 is fixed to the housing 60, and the flexible deformation portion 70 is fixed to the housing 60 from the inner side of the housing 60. Specifically, the protective cover plate 80 can be fixed on the housing 60 in a bonding manner, or the protective cover plate 80 is fixed on the housing 60 by injection molding, so that integrated combination is realized, the combination firmness can be improved, automatic assembly is realized, and the efficiency is improved.

As a specific example, the flexible deformation portion 70 may be combined with the housing 60, the housing 60 may be used as an insert, and the flexible deformation portion 70 is integrally injection-molded to the housing 60, for example, the flexible deformation portion 70 is integrally injection-molded with the lower cover 642. Alternatively, the flexible deformation portion 70 may be fixedly connected to the housing 60 around the mounting hole 65 by bonding, welding or hot melting.

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

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 specifically, may be formed on the lower cover 642. The lower cover plate 642 around the mounting hole 65 is recessed upwards to form a sunken groove 66, the flexible deformation part 70 is fixed on the groove bottom 661 of the sunken groove 66, the groove bottom 661 of the sunken groove 66 is downward, that is, the flexible deformation part 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 642.

When the sound generating device is in a working state, when the diaphragm 21 vibrates downwards to compress the volume of the rear side of the diaphragm 21, sound pressure is transmitted to the flexible deformation part 70 through the rear sound cavity 62, and the flexible deformation part 70 moves towards the outer side of the rear sound cavity 62 to expand and deform; on the contrary, when the diaphragm 21 vibrates upwards, the flexible deformation portion 70 can contract and deform inwards, so that the volume of the rear sound cavity 62 is adjusted, the equivalent acoustic compliance of the rear sound 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 main body portion 71, and the main body portion 71 may be a single-layer structure made of one of polymer plastic, thermoplastic elastomer and silicone rubber, or may be a multi-layer structure, in which at least one layer is made of one of polymer plastic, thermoplastic elastomer and silicone rubber.

The main body 71 may be a flat plate structure, which is beneficial to reduce the height of the flexible deformation part 70 and reduce the occupied space of the flexible deformation part 70. The body portion 71 may also be partially convex or concave, 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 portion 71 may have a wavy structure. In one embodiment, the edge of the body portion 71 is provided with a folded ring portion 72, and the folded ring portion 72 protrudes from the outside of the casing 60 toward the rear sound cavity 62; or, the folded ring part 72 protrudes from the rear sound cavity 62, and the structure of the folded ring part 72 can provide larger elastic deformation, increase the vibration displacement of the flexible deformation part 70, and improve the volume adjusting effect on the rear sound cavity 62.

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

In this embodiment, the rear sound chamber 62 extends in a horizontal direction formed by the length and width of the sound generating device, and the horizontal direction may be defined as a direction perpendicular to the thickness direction of the sound generating device. The horizontal direction generally refers to the direction parallel to the horizontal plane when the sound generating device is placed on the horizontal plane, and the space in the height direction of the sound generating device is not occupied as much as possible, so that the thin design of a product is facilitated.

Referring to fig. 1 and 25, in an embodiment, the housing 60 includes a first portion 671 and a second portion 672 distributed along the transverse direction, the frame 11, the vibration system, the vibrator 30 and the coil 41 are mounted on the first portion 671, the front acoustic cavity 61 is formed on the first portion 671, a part of the rear acoustic cavity 62 is formed on the first portion 671, and another part of the rear acoustic cavity 62 is formed on the second portion 672. As such, the height of the second portion 672 may be greater such that the space of the entire rear acoustic cavity 62 is formed to be greater. In one embodiment, the mounting hole 65 is formed in the second portion 672 and the flexible deformer 70 is mounted to the second portion 672. In this embodiment, the second portion 672 laterally protrudes from the first portion 671, and the whole space of the second portion 672 may be set to be larger, for example, the length of the second portion 672 (which refers to 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 sound cavity 62 is better adjusted. Further, since all the speaker system and the motor system are mounted on the first portion 671 and no other structure is mounted in the second portion 672, there is no case where the other structure interferes with the vibration of the flexible deformation portion 70 when the flexible deformation portion vibrates.

This scheme increases supplementary flexible deformation portion 70 and protective cover 80 at sound generating mechanism back sound chamber 62, forms flexible back chamber system (FRC), for initiative radiation vibrating diaphragm 21 improves extra back sound chamber 62 volume and compliance, promotes the low frequency playback effect of sound generating mechanism product. In addition, because the product back sound cavity 62 is sealed through the flexible deformation part 70, the airflow can not flow out of the back sound cavity 62 and enter the electronic equipment such as the mobile phone interior to cause the mobile phone back shell to resonate, so that the whole machine application experience can be improved.

Referring to fig. 25 and 26, in an embodiment, the rear sound cavity 62 has a first rear cavity 621 and a second rear cavity 622, and the second rear cavity 622 is filled with sound-absorbing particles 91. In order to prevent the sound-absorbing particles 91 from entering the first rear cavity 621, the first rear cavity 621 and the second rear cavity 622 are separated by an air-permeable packing member 92. It is conceivable that the airing means 92 is provided with the airing hole to communicate the first rear cavity 621 and the second rear cavity 622. The venting enclosure 92 may be a mesh or metal mesh, 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 natural zeolite powder, white carbon black, activated carbon, or a mixture of one or more of them, and of course, other materials may be used for the sound-absorbing particles 91 as long as they can absorb sound.

This scheme utilizes sound generating mechanism back sound chamber 62's cavity part to add the particulate matter that has microporous structure, can be used to adsorb the air molecule, plays the effect of virtual increase back sound chamber 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 sound generating device has a smaller thickness in the vertical direction, and can be better matched with the whole machine, and the thickness of the whole machine is prevented from being too large. Specifically, first rear cavity 621 and second rear cavity 622 may be distributed along the moving direction of vibrator 30.

In an embodiment, the volume of the first rear cavity 621 is smaller than that 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 this 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 all 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 this embodiment) is formed in the first portion 671, and the first rear chamber 621 is formed in the bottom of the first portion 671 in this embodiment. 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. As such, the height of the second portion 672 may be greater such that the space of the second rear cavity 622 formed is greater.

When the frame 11 is provided, the frame 11 is mounted to the first portion 671. In order to better limit the position of the frame 11, in an embodiment, a stop wall 68 is disposed at the connection between the first portion 671 and the second portion 672, and the stop 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 a side of the second rear cavity 622. In this embodiment, the side of the frame facing the second part 672 refers to the side near the side of the second part 672. Specifically, the blocking wall 68 is disposed on the upper surface of the housing 60, but the blocking wall 68 may be disposed on the lower surface or the side surface of the housing 60. In addition, the outer side surface of the upper magnetic conduction plate 52 may abut against the blocking wall 68. Similarly, the outer surface of the centering branch piece 24 may abut against the stopper wall 68.

Optionally, the baffle wall 68, together with the diaphragm and the frame 11, separates the front acoustic chamber 61 from the rear acoustic chamber 62, i.e. the baffle wall 68 completely blocks off the side of the frame 11 that does not protrude into the mounting notch.

In one embodiment, the vibrator 30 can move along the distribution directions 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 the first portion 671 and the second portion 672 along the transverse direction, and therefore, the housing 60 is substantially elongated in the distribution direction of the first portion 671 and the second portion 672, so that when the vibrator 30 moves, the space in the longitudinal 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 panels to facilitate the machining of the individual panels. In one embodiment, the upper case 63 includes a first cover plate 631 and a second cover plate 632, the first cover plate 631 covers the diaphragm 21 to form a top wall of the front acoustic cavity 61, and the second cover plate 632 forms a top wall of the second portion (i.e., the second back cavity 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, by integrally bending a side edge of the second cover plate 632.

The air permeable package 92 can be connected to the housing 60 in various ways, for example, a slot is formed in the housing 60 to mate with the air permeable package 92, which is simple and reliable to position the air permeable package 92. Alternatively, the air-permeable package 92 and the housing 60 are fixed by heat fusion, but the air-permeable package 92 and the housing 60 may be fixed by welding or bonding. Alternatively, the air-permeable packing member 92 is integrally injection-molded with the housing 60, and the air-permeable packing member 92 is integrally injection-molded with the housing 60 as an insert. The modes of hot 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 air-permeable packaging member 92 and the shell 60.

The embodiment of the invention also provides electronic equipment which can be a mobile phone, a tablet computer, a notebook computer and the like. The sound generating device is arranged in the electronic equipment, and the electronic equipment is provided with a hole. For the sound generating device being 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 device, and the front sound cavity 61 is communicated with the opening. In the case of the sound generating device being a module, the sound generating device itself has a front sound cavity 61 and a rear sound cavity 62, and the front sound cavity 61 is provided with a sound hole 69 for communicating with the opening of the electronic device.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A sound production device is characterized by comprising a shell, a vibration system, a magnetic circuit system, an elastic supporting piece and a coil, wherein the shell is provided with an installation space, and the vibration system, the magnetic circuit system, the elastic supporting piece and the coil are accommodated in the shell and distributed along the vertical direction;

2. The sound generating apparatus according to claim 1, wherein said magnetic circuit system comprises an inner magnetic circuit system and an outer magnetic circuit system, a magnetic gap is formed between said inner magnetic circuit system and said outer magnetic circuit system, and said voice coil extends into said magnetic gap; the inner magnetic circuit system forms the vibrator, and the outer magnetic circuit system is fixed on the shell.

3. The sound generating apparatus according to claim 2, wherein said internal magnetic circuit system comprises a central magnet having magnetic poles distributed in an up-down direction;

4. The sound generating device according to claim 2, wherein the sound generating device has two elastic supporting members, and the two elastic supporting members are respectively disposed on two opposite sides of the vibrator along the first horizontal direction;

5. The sound generating apparatus of claim 1, wherein said first back volume and said second back volume are distributed in a lateral direction.

6. The sound generating apparatus as claimed in claim 5, wherein said housing includes a first portion and a second portion arranged in a transverse direction, said vibration system, said magnetic circuit system and said coil are mounted to said first portion, said front sound chamber is formed in said first portion, said first rear chamber is located at a bottom of said first portion, and said second rear chamber is located in said second portion.

7. The sound generating apparatus of claim 1 wherein the volume of said second rear volume is greater than the volume of said first rear volume.

8. The sound generating device of claim 1 further comprising a gas permeable enclosure secured to the housing and separating the first back volume from the second back volume.

9. The sound generating device as claimed in claim 8, wherein the housing is provided with a slot for the air-permeable package to be inserted; or the air-permeable packaging piece is fixed with the shell in a hot melting way; or the air-permeable packaging piece is welded or bonded with the shell; alternatively, the breathable package is integrally injection molded with the housing.

10. The sound generating device according to any one of claims 1 to 9, further comprising a frame, wherein 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 diaphragm is fixed to the frame.

11. The sound generating apparatus of claim 10, wherein the frame is mounted to the first portion of the housing, and a connection between the first portion and the second portion of the housing is provided with a blocking wall abutting a side of the frame facing the second portion, the blocking wall, the diaphragm and the frame collectively separating the front sound chamber and the rear sound chamber.

12. An electronic device, characterized in that it comprises a sound-emitting device according to any one of claims 1-11.