CN213028515U

CN213028515U - Sound production device

Info

Publication number: CN213028515U
Application number: CN202020964890.9U
Authority: CN
Inventors: 曹成铭; 吴树文; 吴立峰; 沈凯华
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-04-20
Anticipated expiration: 2030-05-29
Also published as: WO2021237833A1

Abstract

The utility model provides a sounding device, which comprises a shell with an accommodating space and a sounding monomer, wherein the sounding monomer comprises a basin frame, a vibration system and a magnetic circuit system, the vibration system comprises a vibration diaphragm fixed on the basin frame, the shell comprises a back shell plate, a side wall and a fixed step, the side wall surrounds the periphery of the basin frame, and one end of the sounding monomer, which is just opposite to the back shell plate, is fixedly connected with the fixed step; the thickness of the shell is smaller than that of the basin stand; the side wall is attached to the basin frame, or a space is arranged on at least one side of the side wall and the basin frame, and the space is less than 3 times of the thickness of the shell; the rear shell plate, the side wall and the sounding monomer jointly enclose a rear sound cavity, the sounding monomer is provided with a leakage part communicated with the rear sound cavity, the shell is provided with a leakage hole penetrating through the shell, and the rear sound cavity is communicated with the outside through the leakage hole. Compared with the prior art, the utility model discloses a sounding device simple structure, acoustic performance are excellent, user experience is effectual, and the sound production monomer is difficult for falling.

Description

Sound production device

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electroacoustic conversion field especially relates to an apply to vocal device of portable mobile electronic product.

[ background of the invention ]

The sound generating device is also called a loudspeaker, and is widely applied to portable mobile electronic products, such as mobile phones, so that an audio signal is converted into sound to be played, and the sound generating device has high loudness and vibration amplitude.

The sound production device of the related art includes the basin frame, is fixed in respectively the vibration system of basin frame and the magnetic circuit that has the magnetic gap, the magnetic circuit drive vibration system vibration sound production, vibration system is including being fixed in the vibrating diaphragm of basin frame and being fixed in vibrating diaphragm and inserting are located the magnetic gap is in order to drive the voice coil loudspeaker voice coil of vibrating diaphragm vibration sound production.

However, the sound generating device in the related art does not have a rear cavity structure or has an open rear cavity structure, and when the sound generating device is applied to portable mobile electronic products such as a mobile phone, the problem of vibration of the mobile phone shell is caused, so that the user experience effect is poor; however, the space size of the mobile phone is limited, and the sound production device cannot be designed into a loudspeaker box structure with a rear cavity in the prior art so as to overcome the problem. In addition, the sounding unit of the sounding device in the related art is easy to fall off.

Therefore, there is a need to provide a new sound generation device to solve the above technical problems.

[ Utility model ] content

An object of the utility model is to provide a simple structure, acoustic performance are good, user experience is effectual, and the difficult sounder who falls of sound production monomer.

In order to achieve the above object, the present invention provides a sound generating device, which comprises a housing having an accommodating space and a sound generating unit fixedly accommodated in the housing, the sounding unit and the shell jointly enclose a closed rear sound cavity, the sounding unit comprises a basin frame, a vibration system and a magnetic circuit system, the vibration system is respectively supported and fixed on the basin frame, the magnetic circuit system drives the vibration system to vibrate and sound, the vibration system comprises a vibration diaphragm fixed on the basin frame, the shell comprises a rear shell plate which is positioned on one side of the basin frame far away from the vibration diaphragm and is spaced from the sound production monomer, a side wall which extends from the periphery of the rear shell plate to the direction close to the vibration diaphragm and a fixed step which extends from the side wall to the inside of the containing space, the side wall surrounds the periphery of the basin stand, and one end of the sounding monomer, which is opposite to the rear shell plate, is fixedly connected with the fixed step; the thickness of the shell is smaller than that of the basin stand;

the side wall is attached to the basin frame, or a gap is formed between the side wall and at least one side of the basin frame, and the gap is less than 3 times of the thickness of the shell;

the back coverboard the lateral wall reaches the sound production monomer encloses jointly the back sound chamber, the sound production monomer be equipped with the portion of revealing of back sound chamber intercommunication, the casing is equipped with the hole of revealing that runs through it, the hole of revealing will back sound chamber and external intercommunication.

Preferably, the side wall includes a rear shell extension wall connected to the rear shell plate and a base extension wall abutted to the rear shell extension wall, and the fixing step is formed by bending and extending one end of the rear shell extension wall abutted to the base extension wall into the accommodating space.

Preferably, the rear case plate, the rear case extension wall, and the fixing step are integrally formed.

Preferably, the side wall includes a rear shell extension wall connected to the rear shell plate and a base extension wall abutted to the rear shell extension wall, and the fixing step is sandwiched between the rear shell extension wall and the base extension wall.

Preferably, the base extension wall surrounds the periphery of the basin frame and is fixedly attached to the periphery of the basin frame.

Preferably, the casing still includes certainly the base extends the wall to being close to the base plate that the diaphragm direction bending extended, the base plate with the basin frame is kept away from the one end fixed connection of back shell plate.

Preferably, the base plate is provided with a sound hole penetrating therethrough, and the sound hole is opposite to the diaphragm.

Preferably, the fixed step is a flat steel sheet.

Preferably, the ratio of the thickness of the shell to the thickness of the basin stand is less than 0.4.

Preferably, the housing is made of a metal material.

Preferably, the housing is at least partially grounded.

Preferably, the sound production device further comprises a conductive member, one end of the conductive member is connected to the housing, and the other end of the conductive member is used for grounding.

Preferably, the conductive member is formed by extending the housing.

Preferably, the sound production device further comprises a conductive piece, wherein the conductive piece comprises two electrical paths, one of the electrical paths is used for connecting the sound production unit with an external electrical signal, and the other electrical path is used for connecting the shell with the ground.

Preferably, the sound production device further comprises at least two positioning pieces, the two positioning pieces are connected to two opposite sides or two opposite corners of the shell, and one end, far away from the shell, of each positioning piece is provided with a positioning hole penetrating through the positioning piece.

Preferably, the locating piece is formed by extending the shell outwards.

Preferably, the housing is made of a steel sheet with a thickness of 0.15 mm.

Preferably, the sound production monomer is still located including the lid the basin frame is close to the protecgulum of vibrating diaphragm one side, the protecgulum the base extends the wall the bed plate and the vibrating diaphragm encloses into preceding sound chamber jointly, the protecgulum is equipped with the edge the vibration direction runs through the through-hole above that, the through-hole will preceding sound chamber is connected with the external world.

Preferably, the sound production device further comprises a front cover covering one side of the basin frame close to the vibrating diaphragm, the front cover, the base extension wall, the base plate and the vibrating diaphragm together enclose a front sound cavity, the front cover is provided with a through hole penetrating through the front cover along the vibration direction, and the through hole connects the front sound cavity with the outside; the base plate is fixedly pressed on one side, far away from the vibrating diaphragm, of the periphery of the front cover, and the front cover penetrates through the sound-emitting holes and is exposed out of the base.

Preferably, the sound production device further comprises a ventilation damping member attached to the front cover, and the ventilation damping member completely covers the through hole.

Preferably, the sound production device comprises a sound guide shell, wherein the sound production unit is arranged on the sound production shell and is far away from one side of the rear shell plate, the sound guide shell is provided with a sound guide cavity forming a side sound production structure, and the sound guide cavity is communicated with the vibrating diaphragm.

Preferably, the shell and the sounding monomer further enclose a sound guide cavity forming a side sounding structure, and the sound guide cavity is communicated with the vibrating diaphragm.

Preferably, the sounding device further comprises a breathable isolating piece located in the rear sound cavity, and the breathable isolating piece is attached to the sounding single body and separates the sounding single body from the rear sound cavity.

Preferably, the sound production device further comprises a breathable partition located in the rear sound cavity, and the breathable partition comprises a partition body arranged opposite to the rear shell plate at a distance, a partition extending part bent and extending from the periphery of the partition body to the direction of the rear shell plate, and a partition fixing part bent and extending from one end of the partition extending part far away from the partition body; the spacer extending part and the rear shell extending wall are arranged at intervals, and the spacer fixing part is fixed on the rear shell plate; the breathable isolating piece, the rear shell plate and the rear shell extension wall jointly enclose a powder filling space.

Preferably, the isolating piece body is close to one side of the sounding monomer is far away from the sounding monomer is sunken in direction to form an avoiding step, and the avoiding step and the leakage part are arranged just opposite to each other.

Preferably, the area ratio of the orthographic projection of the sounding monomer to the rear shell plate along the vibration direction of the diaphragm to the rear shell plate is at least 2/3.

Preferably, the interval is less than or equal to 1/3 of the width of the fixing surface of the diaphragm fixed on the basin stand.

Compared with the prior art, the utility model discloses an among the sound production device, the back coverboard the lateral wall reaches sound production monomer encloses into sealed back sound cavity structure jointly, and its simple structure has improved the acoustic performance of sound production device on the one hand, especially low frequency acoustic performance, and on the other hand is because of the existence of back sound cavity structure, and the casing forms the effect of shaking, makes sound production device can not make electronic products such as mobile terminal produce the shell phenomenon of shaking after applying to electronic products such as mobile terminal, has effectively increased customer's user experience effect. On the other hand, fixed step by the lateral wall to extend formation in the accommodating space, the lateral wall encircles basin frame week side, just the sound production monomer is just right the one end of back shell board with fixed step fixed connection. The setting of this structure for the sound production monomer is fixed in fixed step, further improvement the reliability that the sound production monomer fell, and fixed step has still played limiting displacement, is installing during the sound production monomer, can effectively avoid the assembly error between casing and the sound production monomer, and then promoted the assembly efficiency of sound production device.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and 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 without inventive work, wherein:

fig. 1 is a schematic perspective view of the sound device of the present invention;

FIG. 2 is an exploded view of the sound device according to the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 1;

FIG. 4 is a cross-sectional view of another embodiment of FIG. 3;

fig. 5 is a schematic perspective view of an embodiment of the sound production device of the present invention, in which a conductive member is added;

FIG. 6 is a schematic perspective view of another derivative embodiment of FIG. 5;

fig. 7 is a schematic perspective view of another embodiment of the sound production device of the present invention, which is added with a conductive member;

FIG. 8 is an exploded view of a portion of the perspective structure of FIG. 7;

FIG. 9 is a schematic structural view of an embodiment of the case forming side sounding structure of FIG. 4;

FIG. 10 is a schematic view of the sound device of FIG. 4 with an additional air permeable spacer;

FIG. 11 is a schematic view of another embodiment of the construction of the breathable barrier of the embodiment of FIG. 10;

FIG. 12 is a schematic structural view of a derivative embodiment of the embodiment of FIG. 11;

FIG. 13 is a schematic structural view of the sound device of FIG. 1 with an additional positioning plate;

FIG. 14 is a schematic diagram of a derivative embodiment of the embodiment shown in FIG. 13.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a sound generating device 100, which includes a housing 1 having an accommodating space and a sound generating unit 2 accommodated in the housing 1, wherein the sound generating unit 2 and the housing 1 together form a closed rear sound cavity 102.

The sounding unit 2 includes a frame 21, a vibration system 22, a magnetic circuit system 23, and a leakage portion 24.

The vibration system 22 and the magnetic circuit system 23 are respectively supported and fixed on the frame 21 and jointly enclose a sound-producing cavity 103, and the magnetic circuit system 23 drives the vibration system 22 to vibrate and produce sound.

The vibration system 22 comprises a vibrating diaphragm 221 fixed on the basin frame 21, and the vibrating diaphragm 221 is used for vibrating and sounding.

In this embodiment, the thickness of the shell 1 is smaller than that of the basin frame 21, and preferably, the shell 1 is made of a steel sheet with the thickness of 0.15mm, so that shell vibration is effectively reduced.

The shell 1 comprises a rear shell plate 11, a side wall 12 and a fixed step 13, wherein the rear shell plate 11 is located on one side, far away from the vibrating diaphragm 221, of the basin frame 21 and is spaced from the sound-generating single body 2, the side wall 12 extends from the periphery of the rear shell plate 11 to the direction close to the vibrating diaphragm 221, the fixed step 13 extends from the side wall 12 to the accommodating space, the side wall 11 surrounds the periphery of the basin frame 21, and one end, facing the rear shell plate 11, of the sound-generating single body 2 is fixedly connected with the fixed step 13;

in the embodiment, the ratio of the thickness of the shell 1 to the thickness of the basin frame 21 is less than 0.4, so that the size of the sounding device 100 along the direction perpendicular to the vibration direction is increased as small as possible while the structural strength of the shell 1 is satisfied; but also ensures the structural strength of the basin stand 21 and occupies as little space as possible.

Specifically, the rear sound cavity 102 is defined by the rear shell plate 11, the side wall 12 and the sound generating unit 2, and the leakage portion 24 is communicated with the rear sound cavity 102, so that the sound generating inner cavity 103 is communicated with the rear sound cavity 102 through the leakage portion 24, and low-frequency acoustic performance is improved. The casing 1 is provided with a leakage hole 16 penetrating therethrough, and the leakage hole 16 communicates the rear sound cavity 102 with the outside for balancing sound pressure.

In the structure, the fixed step 13 is formed by extending the side wall 12 into the accommodating space, the side wall 12 surrounds the periphery of the basin frame 21, and the sounding single body 2 is right opposite to one end of the rear shell plate 11 and fixedly connected with the fixed step 13. The setting of this structure for sound production monomer 2 is fixed in fixed step 13, further improvement the reliability that sound production monomer 2 fell, in addition, fixed step 13 has still played limiting displacement, is installing during sound production monomer 2, can effectively avoid casing 1 with assembly error between the sound production monomer 2, and then promoted the assembly efficiency of sound production device 100.

In this embodiment, the side wall 12 is attached to the frame 21, or a gap is formed between the side wall 12 and at least one side of the frame 21, and the gap is smaller than 3 times the thickness of the housing 1. The spaced arrangement can enable the sounding single body 2 to be assembled into the shell 1 more quickly, the assembly efficiency is improved, and meanwhile, the sounding device 100 does not occupy more transverse space which is perpendicular to the vibration direction. In addition, the above-mentioned interval can also be used to increase the volume of the rear sound cavity 102, and further improve the acoustic performance, in this embodiment, the interval is less than or equal to 1/3 of the width of the fixing surface (bonding surface) of the diaphragm 221 fixed to the frame 21.

The side wall 12 includes a rear housing extension wall 121 connected to the rear housing plate 11 and a base extension wall 122 abutting against the rear housing extension wall 121, and in the present embodiment, the fixing step 13 is formed by bending and extending into the accommodating space from one end of the rear housing extension wall 121 abutting against the base extension wall 122. Alternatively, the fixed step 13 may be a single member, for example, the fixed step 13 may be a flat steel sheet sandwiched and fixed between the base extension wall 122 and the rear housing extension wall 121.

In order to simplify the assembly process, the rear case plate 11, the rear case extension wall 121, and the fixing step 13 are integrally formed.

Further, the housing 1 further includes a base plate 14 extending from the base extension wall 122 in a direction approaching the diaphragm 221. The base extension wall 122 encircles basin frame 21 week side and with basin frame 21 week side fixed laminating, the bed plate 14 with the basin frame 21 is kept away from the one end fixed connection of back shell plate 11. The base plate 14 is provided with a sound hole 141 penetrating therethrough, and the sound hole 141 is opposite to the diaphragm 21 for emitting sound.

Therefore, the utility model discloses an above-mentioned sound production device 100, back coverboard 11 the lateral wall 12 reaches sound production monomer 2 encloses into jointly and seals back vocal cavity 102, its simple structure has improved sound production device 100's acoustic performance on the one hand, especially low frequency acoustic performance, and on the other hand is because of the existence of back vocal cavity 102 structure, and casing 1 forms and shakes the effect, makes sound production device 100 can not make electronic products such as mobile terminal produce the shell phenomenon of shaking after applying to electronic products such as mobile terminal, has effectively increased customer's user experience effect.

More preferably, the sounding monomer 2 further comprises a cover arranged on the basin frame 21 close to the front cover 4 on one side of the vibrating diaphragm 221, the front cover 4, the base extension wall 122, the base plate 14 and the vibrating diaphragm 221 jointly enclose the front sound cavity 101, the front cover 4 is provided with an edge, the vibration direction penetrates through the through hole 41 on the front sound cavity, and the through hole 41 connects the front sound cavity 101 with the outside. In the present embodiment, the front cover 4 is a part of the sound generating unit 2, that is, the sound generating unit 2 is provided with the front cover 4.

Alternatively, the front cover 4 may not be a part of the sounding unit 2, but is a component of the sounding device 100, for example, the sounding device 100 further includes a front cover 4 covering the side of the basin frame 21 close to the diaphragm 221, and the front cover 4, the base extension wall 122, the base plate 14 and the diaphragm 221 together enclose the front sound cavity 101. The front cover 4 is provided with a through hole 41 penetrating through the front cover along the vibration direction, the front sound cavity 101 is connected with the outside through the through hole 41, and the structure arrangement improves the medium-frequency and high-frequency performance of the sound production device 100. In this embodiment, the base plate 14 is fixed to the side of the periphery of the front cover 4 away from the diaphragm 221, and the front cover 4 passes through the sound-emitting hole 141 and is exposed out of the base plate 114.

In order to further improve the medium-frequency and high-frequency performance of the sound-generating device 100, the sound-generating device 100 further comprises a ventilation damping member 5 attached to the front cover 4, the ventilation damping member 5 completely covers the through hole 41, on one hand, the ventilation damping member is used for preventing foreign matters from entering the front sound cavity 101, and on the other hand, the medium-frequency and high-frequency performance of the sound-generating device can be adjusted by adjusting the damping of the ventilation damping member 5.

In this embodiment, the through holes 41 include a plurality of through holes and are arranged in an array, so as to improve the sound stability and balance.

In this embodiment, the housing 1 may be made of metal, glass, ceramic, or other materials. Preferably, the housing 1 is made of a metal material, such as steel, iron, copper, etc. It may be designed thinner while satisfying structural strength, thereby further reducing the lateral dimension of the sound device 100 in a direction perpendicular to the direction of vibration.

More preferably, the casing 1 is at least partially grounded, so that a shielding effect on the sounding single body 2 can be formed, interference influence of an external signal on the sounding single body 2 is reduced, and reliability is improved.

In this embodiment, the area ratio of the orthographic projection of the sound generating unit 2 on the back shell plate 11 along the vibration direction of the diaphragm 221 to the back shell plate 11 is at least 2/3. The structure can ensure that the size of the sounding device 100 perpendicular to the vibration direction is as small as possible, and the sounding device is more convenient to mount on a product with small transverse size in an assembly space while meeting the requirements of forming the rear sound cavity 102 to realize vibration absorption and improve low-frequency acoustic performance.

Preferably, the sound production device 100 further comprises a ventilation spacer located in the rear sound cavity 102, and when sound absorption materials, such as sound absorption particles, are filled in the rear sound cavity 102, the ventilation spacer effectively prevents the sound absorption particles from entering a space between the magnetic circuit system 23 and the vibration system 22, thereby avoiding the risk of sound production failure and improving reliability.

Fig. 5 is a schematic view of a three-dimensional structure of an embodiment of the sound generating device of the present invention for adding a conductive member. In the sound generating device 300, the housing 301 is made of a metal material, such as steel, iron, copper, etc., and for example, the housing 301 is made of a steel sheet with a thickness of 0.15 mm.

The housing 301 can be made thinner with the same structural strength by using a metal material, thereby further reducing the horizontal dimension of the sound device 300 in the direction perpendicular to the vibration direction. The main differences from the embodiment shown in fig. 1 are: this embodiment also includes providing a conductive member 6.

Specifically, the sounding device 300 further includes a conductive member 6, one end of the conductive member 6 is connected to the housing 301, and the other end of the conductive member 6 is grounded, so as to form a shielding effect, so that the sounding unit 300 is prevented from being interfered by external electromagnetic waves, and the working reliability is better.

Referring to fig. 6, it is a schematic perspective view of another derivative embodiment shown in fig. 5, that is, in the sound production device 400, the conductive member 406 is integrated with the housing 401, for example, the conductive member 406 is formed by extending the side wall 4012 away from the basin stand and is located outside the housing 401.

Fig. 7 is a schematic perspective view of another embodiment of the sound generating device of the present invention, which is added with a conductive member. This embodiment differs from the embodiment shown in fig. 5 in that the structure and function of the conductive member are different.

Specifically, the sounding device 500 further includes a conductive component 506, the conductive component 506 includes two mutually insulated electrical pathways, one of the electrical pathways is used for connecting the sounding unit 502 and an external electrical signal and supplying power to the sounding unit 502, and the other electrical pathway is used for connecting the housing 501 and the ground to form a shield for the sounding unit 502. In this embodiment, the conductive member 506 is used to form a shielding function together with the housing 501, and is also used to supply power to the sound generating unit 502, so that the structure is simpler and dual functions can be realized.

For example, the conductive member 506 is an FPC structure. As shown in fig. 8, the conductive member 506 includes a first arm 5061 extending through the sidewall 5012, a second arm 5062 extending from opposite ends of the first arm 5061 in a direction toward the basin stand 5021, a third arm 5064 extending from the first arm 5061 in a direction away from the basin stand 5021, and a fourth arm 5064 extending from the first arm 5061 in a direction away from the basin stand 5021.

The first arm 5061 is electrically connected to the housing 501; the second arm 5062 is fixed to the basin stand 5021 and is electrically connected with the sounding unit 502 to supply power to the sounding unit 502; the third arm 5063 is used for connecting external electrical signals; the fourth arm 5064 is for grounding. That is, the first arm 5061 and the fourth arm 5064 jointly realize the connection between the housing 501 and the ground, so as to form an electrical path for shielding the sounding unit 502; the first arm 5061, the second arm 5062, and the third arm 5063 collectively realize electrical connection of the sounding unit 502 and an external electrical signal, and realize another electrical path through which the sounding unit 502 communicates with the external electrical signal.

As shown in fig. 9, a schematic structural diagram of an embodiment for forming a side sounding in addition to the embodiment shown in fig. 4 is shown. Namely, the sounding device generates sound from the front to form a side sounding structure.

Specifically, the sound production device 100 includes a cover disposed on the sound production unit 2, the sound guide casing 15 is disposed on one side of the rear casing 12, the sound guide casing 15 has a sound guide cavity 30 forming a side sound production structure, and the sound guide cavity 30 is communicated with the diaphragm 221. This side sound production structure can be better guide the sound production, is convenient for positive sound production and is used under the condition that keeps off, uses the flexibility higher.

For example, the sound guiding shell 15 and the diaphragm 221 together enclose a sound guiding cavity 30. Specifically, the sound guiding shell 15 includes a sound guiding shell plate 151 opposite to the vibrating diaphragm 221 at intervals and a sound guiding shell extension wall 152 fixed to the sound generating unit 2 at the periphery of the sound guiding shell plate 151 in a bending manner and supported by the sound generating unit 2, and the sound guiding shell extension wall 152 is provided with a sound guiding hole 153 penetrating through the sound guiding shell extension wall 152, so that a side sound generating structure is formed, and flexible application of different installation positions is facilitated.

It should be noted that the communication between the sound guiding cavity 30 and the diaphragm 221 may be direct communication, or the diaphragm 221 may communicate with the sound guiding cavity 30 through the front sound cavity 101, which is easily understood by those skilled in the art. In this case, it is understood that the sound guiding shell 15 is a component of the sound generating device 100 and does not belong to the housing 1.

It is also possible to understand the sound guiding shell 15 as a part of the housing 1, i.e. the sound guiding shell 15 may be a part of the housing 1, in this case, the housing 1 and the sound generating unit 2 further enclose a sound guiding cavity 30 forming a side sound generating structure, and the sound guiding cavity 30 is communicated with the diaphragm 221.

Fig. 10 is a schematic structural view of the sound production device shown in fig. 4 with an additional air-permeable partition. Concretely, sound production device 100 is still including being located ventilative separator 7 in back sound chamber 102, ventilative separator 7 pastes and locates sound production monomer 2 and will sound production monomer 2 is followed separation in the back sound chamber 102, when the sound granule was inhaled in the packing in the back sound chamber 102, ventilative separator 7 has then prevented to inhale sound granule and has got into sound production monomer 2 inside and influence its acoustic performance, has improved the sound production reliability.

Please refer to fig. 11, which is a schematic view of a specific structure of the air-permeable partition in the embodiment shown in fig. 10. The sounding device 600 further includes a ventilation spacer 607 in the rear acoustic cavity 60102, the ventilation spacer 607 includes a spacer body 6071 opposite to the rear casing plate 6011 at an interval, a spacer extending portion 6072 extending in the direction of the rear casing plate 6011 in a bending manner along the periphery of the spacer body 6071, and a spacer fixing portion 6073 extending in the direction of the rear casing plate 6011 in a bending manner and away from the spacer extending portion 6072.

The spacer extension part 6072 is disposed at a distance from the rear case extension wall 60121, and the spacer fixing part 6073 is fixed to the rear case plate 6011; the air-permeable isolating piece 607, the rear shell plate 6011 and the rear shell extension wall 60121 together enclose a powder filling space 601. The structure that the spacer extension 6072 and the rear shell extension wall 60121 are arranged at intervals can effectively increase the ventilation smoothness of the rear acoustic cavity 60102 and improve the stability of low-frequency sound production performance.

Please refer to fig. 12, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in fig. 11. In the sounding device 700, one side of the spacer body 7071, which is close to the sounding unit 702, is recessed in a direction away from the sounding unit 702 to form an avoidance step 7074, and the avoidance step 7074 is arranged opposite to the leakage portion 7024. This structural arrangement can make the leakage of the sounding inner cavity 7103 of the sounding unit 702 smoother, thereby improving the sounding performance.

Please refer to fig. 13, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in fig. 1. The sound production device 800 further comprises at least two positioning pieces 8 and are respectively connected with the shell 801. One end of the positioning plate 8, which is far away from the shell 801, is provided with a positioning hole 81 penetrating through the positioning plate for fixing and positioning the sound generating device 800 and an application terminal whole machine, for example, a threaded hole, and a screw can be used to fix the sound generating device on the terminal whole machine through the positioning hole 81, so that the terminal whole machine is simple and convenient to use, and at least two positioning plates 8 can be arranged to more effectively form positioning and fixing. In order to further improve the fixing stability, the two positioning pieces 8 are connected to two opposite sides or two pairs of corners of the housing 801, and the sound generating device 800 and the terminal complete machine are positioned and fixed more effectively by the symmetrical arrangement. In the present embodiment, the positioning piece 8 is fixed to the housing 801 by welding, that is, the positioning piece 8 and the housing 801 are a two-piece structure.

Please refer to fig. 14, which is a schematic structural diagram of a derivative embodiment of the embodiment shown in fig. 13. The difference between the sound device 900 of the present embodiment and the embodiment shown in fig. 13 is that in the sound device 900 of the present embodiment, the positioning plate 908 is formed by extending the housing 901 outward, i.e. the positioning plate 908 and the housing 901 are formed as an integral structure, so that the forming is simple, the number of devices is reduced, and the assembly efficiency is improved.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims

1. A sounding device comprises a shell with an accommodating space and a sounding monomer fixedly accommodated in the shell, wherein the sounding monomer and the shell jointly enclose a closed rear sound cavity, the sounding monomer comprises a basin frame, a vibration system and a magnetic circuit, the vibration system is fixedly supported on the basin frame, the magnetic circuit drives the vibration system to vibrate and sound, the vibration system comprises a vibration diaphragm fixed on the basin frame, the sounding device is characterized in that the shell comprises a rear shell plate, a side wall and a fixed step, the rear shell plate is positioned on one side of the basin frame, away from the vibration diaphragm and spaced from the sounding monomer, the side wall extends from the periphery of the rear shell plate to the direction close to the vibration diaphragm, the fixed step extends from the side wall to the accommodating space, the side wall surrounds the periphery of the basin frame, and one end, opposite to the rear shell plate, of the sounding monomer is fixedly connected with the fixed step; the thickness of the shell is smaller than that of the basin stand;

2. The sounding device according to claim 1, wherein the side wall includes a rear casing extension wall connected to the rear casing plate and a base extension wall abutting against the rear casing extension wall, and the fixing step is formed by bending and extending from an end of the rear casing extension wall abutting against the base extension wall into the receiving space.

3. The sounder device according to claim 2, wherein the back housing plate, the back housing extension wall, and the fixed step are integrally formed.

4. The sounder device according to claim 1, wherein the side walls include a rear housing extension wall connected to the rear housing plate and a base extension wall abutting the rear housing extension wall, the fixed step being sandwiched between the rear housing extension wall and the base extension wall.

5. The sounder device according to claim 2 or 4, wherein the base extension wall surrounds and is fixedly attached to a peripheral side of the frame.

6. The sounder device according to claim 2 or 4, wherein the housing further comprises a base plate extending from the base extension wall in a direction toward the diaphragm, and the base plate is fixedly connected to an end of the frame away from the back housing plate.

7. The sounder device according to claim 6, wherein the base plate has a sound opening therethrough, the sound opening being opposite the diaphragm.

8. A sound-producing device according to claim 4, wherein the fixed step is provided as a flat sheet of steel.

9. The sounder device according to claim 1, wherein a ratio of a thickness of the housing to a thickness of the basket is less than 0.4.

10. The sounder device according to claim 1, wherein the housing is made of a metallic material.

11. The sounder device according to claim 10, wherein the housing is at least partially grounded.

12. The sounder device according to claim 10, further comprising a conductive member having one end connected to the housing and another end for grounding.

13. The sounder device according to claim 12, wherein the conductive member is formed by extending the housing.

14. The sounder device according to claim 10, further comprising a conductive member comprising two electrical paths, wherein one of the electrical paths is configured to connect the sounding body to an external electrical signal, and the other electrical path is configured to connect the housing to ground.

15. The sound production device of claim 10, further comprising at least two positioning pieces, wherein the two positioning pieces are connected to two opposite sides or two pairs of corners of the housing, and one end of each positioning piece, which is far away from the housing, is provided with a positioning hole penetrating through the positioning piece.

16. The sounder device according to claim 15, wherein the splines are formed by extending outwardly from the housing.

17. The sounder device according to claim 1, wherein the housing is formed from 0.15mm thick sheet steel.

18. The sounding device according to claim 7, wherein the sounding unit further comprises a front cover covering a side of the frame close to the diaphragm, the front cover, the base extension wall, the base plate and the diaphragm together define a front sound cavity, the front cover is provided with a through hole penetrating through the front cover along the vibration direction of the diaphragm, and the through hole connects the front sound cavity with the outside.

19. The sounder device according to claim 7, further comprising a front cover covering a side of the frame adjacent to the diaphragm, wherein the front cover, the base extension wall, the base plate, and the diaphragm collectively define a front sound cavity, the front cover having a through hole extending therethrough in a vibration direction of the diaphragm, the through hole connecting the front sound cavity with the outside; the base plate is fixedly pressed on one side, far away from the vibrating diaphragm, of the periphery of the front cover, and the front cover penetrates through the sound-emitting holes and is exposed out of the base.

20. The sounder device according to claim 18 or 19, further comprising a gas permeable damper affixed to the front cover, the gas permeable damper completely covering the through hole.

21. The sound-generating device as claimed in claim 1, wherein the sound-generating device comprises a sound-guiding shell covering a side of the sound-generating unit away from the back shell plate, the sound-guiding shell having a sound-guiding cavity forming a side sound-generating structure, the sound-guiding cavity being in communication with the diaphragm.

22. The sound production device of claim 1, wherein the housing and the sound production unit further enclose a sound guide cavity forming a side sound production structure, and the sound guide cavity is communicated with the diaphragm.

23. The sound-producing device of claim 1 further comprising a gas-permeable spacer positioned within the rear acoustic cavity, the gas-permeable spacer being attached to the sound-producing unitary body and separating the sound-producing unitary body from the rear acoustic cavity.

24. The sound production device of claim 1, further comprising a gas permeable spacer located in the rear sound cavity, wherein the gas permeable spacer comprises a spacer body disposed opposite to the rear shell plate at a distance, a spacer extension portion extending from the periphery of the spacer body in a bending manner toward the rear shell plate, and a spacer fixing portion extending from one end of the spacer extension portion away from the spacer body in a bending manner; the spacer extending part and the rear shell extending wall are arranged at intervals, and the spacer fixing part is fixed on the rear shell plate; the breathable isolating piece, the rear shell plate and the rear shell extension wall jointly enclose a powder filling space.

25. The sound production device according to claim 24, wherein a side of the spacer body close to the sounding unit is recessed away from the sounding unit to form an avoiding step, and the avoiding step is opposite to the leakage portion.

26. The sound production device of claim 1, wherein the ratio of the area of the orthographic projection of the sound production unit to the back shell plate in the vibration direction of the diaphragm to the area of the back shell plate is at least 2/3.

27. The sounder device according to claim 1, wherein the spacing is less than or equal to 1/3 of the width of the fixing surface of the diaphragm to the frame.