WO2021031475A1

WO2021031475A1 - Acoustic device and electronic apparatus

Info

Publication number: WO2021031475A1
Application number: PCT/CN2019/126126
Authority: WO
Inventors: 徐同雁; 陈阿亮
Original assignee: 歌尔股份有限公司
Priority date: 2019-08-21
Filing date: 2019-12-18
Publication date: 2021-02-25
Also published as: CN110662134A; CN110662134B

Abstract

Disclosed is an acoustic device, comprising: a sound production unit. A first closed cavity is formed in the rear side of the vibrating diaphragm of the sound production unit. A mounting hole is formed in the cavity wall of a first closed cavity. A flexible deformation assembly covering the mounting hole is provided at the mounting hole. A second closed cavity is formed in the outer side of the first closed cavity. The flexible deformation assembly is located between the first closed cavity and the second closed cavity. The flexible deformation assembly comprises a flexible deformation portion and a protective member. The protective member is located on the side of the flexible deformation portion away from the first closed cavity. A chamber is enclosed by the protective member, the flexible deformation portion, and a first housing. The chamber has a top wall part directly facing the flexible deformation portion and a side wall part connected to the top wall part, and a vent hole is formed in the side wall part and used for communicating the chamber with the second closed cavity. The flexible deformation portion of the acoustic device of the present invention is protected by the protective member, so as to avoid damage, thereby avoiding the impact on the performance.

Description

Acoustic device and electronic equipment

Technical field

The present invention relates to the technical field of acoustics, in particular to an acoustic device and an electronic device equipped with the acoustic device.

Background technique

The acoustic system of the traditional structure includes a closed box and a sounding unit arranged on the closed box. A cavity is formed between the closed box and the sounding unit. As the volume of the current terminal electronic products is getting smaller and smaller, with the volume of the terminal electronic products The size of the acoustic device is reduced, the thickness is thinner, and the volume of the acoustic device matched with it is getting smaller and smaller, but consumers have higher and higher requirements for the performance of the product, especially the bass effect of the sound. For a small-volume acoustic device, the volume of the chamber in the acoustic system is also limited due to the volume limitation, and it is difficult for this type of acoustic system to achieve satisfactory bass reproduction.

One current approach is to install a flexible membrane on the housing of the acoustic system. During use or assembly, the flexible membrane is likely to come into contact with other components and cause damage to the flexible membrane, thereby affecting product performance.

Summary of the invention

The main purpose of the present invention is to provide an acoustic device and electronic equipment, which aims to solve the technical problem that the flexible deformable part of the existing acoustic device is easily damaged during use or assembly.

In order to achieve the foregoing and other objectives, an acoustic device provided by the present invention includes:

A sounding unit, the sounding unit includes a vibrating diaphragm, the acoustic device is provided with a sound hole, the sound wave on the front side of the vibrating diaphragm is radiated to the outside through the sound hole; the rear side of the vibrating diaphragm forms a A sealed cavity, the cavity wall of the first sealed cavity is a first shell, the first shell is provided with a mounting hole, and the mounting hole is provided with a flexible deformation component covering the mounting hole, The outer side of the first sealed cavity is provided with a second sealed cavity, the flexible deformation component is located between the first sealed cavity and the second sealed cavity, and the second sealed cavity places the flexible deformable part in The sound wave generated during deformation is enclosed in the second sealed cavity; the flexible deformation component includes a flexible deformation part and a protection device, and the protection device is provided on a side of the flexible deformation part away from the first sealed cavity, The protective device, the flexible deformable part and the first housing are enclosed to form a cavity, the cavity having a top wall portion directly opposite to the flexible deformable portion and a side wall portion connected to the top wall portion , A vent hole is provided on the side wall portion, and the vent hole is used to communicate the cavity and the second closed cavity.

Optionally, the vent hole is provided on the side wall of the first housing.

Optionally, the vent hole is formed by enclosing the protective device and the side wall of the first housing.

Optionally, a support portion is provided in the mounting hole, the flexible deformation portion and the protection device are both fixed to the support portion, and the flexible deformation portion and the protection device are respectively located on two sides of the support portion. side.

Optionally, the first housing is recessed in the direction of the first sealed cavity to form an installation groove, and the groove bottom of the installation groove is provided with the installation hole.

Optionally, the flexible deformable portion is provided at the bottom of the groove and covers the mounting hole, and the protective device is provided at the notch of the mounting groove.

Optionally, the flexible deformable part is fixed to the first housing by applying glue or using double-sided tape.

Optionally, the protection device and the first housing are integrally injection molded with a plastic material.

Optionally, the protective device is at least one of steel sheet, PCB, PET, PEN, carbon fiber sheet, and ceramic sheet.

Optionally, the protection device and the first housing are fixed by injection molding.

Optionally, the protection device and the first housing are fixed by bonding.

Optionally, it further includes a first dust-proof net, and the first dust-proof net is covered by the vent.

Optionally, air-permeable micropores are provided on the protective device.

Optionally, the protective device is provided with a second dust-proof net covering the air-permeable micropores.

In order to achieve the foregoing and other objectives, the present invention provides an electronic device, which includes a housing of the electronic device and the foregoing acoustic device.

The technical effect of the present invention is at least that the cavity wall of the first closed cavity of the acoustic device is provided with a mounting hole, and the mounting hole is provided with a flexible deformation component covering the mounting hole. The flexible deformation component includes a flexible deformation part and a protection device. The device is arranged on the side of the flexible deformable part away from the first sealed cavity, the cavity wall of the first sealed cavity is used to enclose the flexible deformable part and the guard to form the side wall of the cavity and/or the guard is provided with vent holes , The vent is used to connect the cavity and the second closed cavity. In this way, the protective device can protect the flexible deformed part from damage and destruction.

Through the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear.

Description of the drawings

The drawings constituting a part of the specification describe the embodiments of the present invention, and together with the specification are used to explain the principle of the present invention.

Figure 1 is a cross-sectional view of an embodiment of the acoustic device of the present invention;

Figure 2 is an exploded view of another embodiment of the acoustic device of the present invention;

3 is a schematic diagram of the assembly structure of the upper shell and the steel sheet in another embodiment of the acoustic device of the present invention;

Figure 4 is a top view of another embodiment of the acoustic device of the present invention;

Fig. 5 is a cross-sectional view along the A-A direction of the embodiment of Fig. 4 of the acoustic device of the present invention;

Figure 6 is a cross-sectional view along the B-B direction of the Figure 4 embodiment of the acoustic device of the present invention

Description with icon number:

10 is the upper shell, 101 is the steel sheet, 102 is the mesh cloth, 103 is the sound hole, 104 is the vent hole, 105 is the mounting hole, 106 is the support part, 107 is the mounting groove, 11 is the diaphragm, 12 is the sound unit , 13 is an FPC, 14 is a lower shell, 141 is an opening, 21 is a first shell, 211 is a pressure equalizing hole, 22 is a second shell, 31 is a first sealed cavity, and 32 is a second sealed cavity.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless specifically stated otherwise, the relative arrangement, numerical expressions and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any limitation to the present invention and its application or use.

The technologies, methods, and equipment known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be regarded as part of the specification.

In all the examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiment may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

The present invention provides an acoustic device for sound generation on electronic equipment.

As shown in Figs. 1-5, the acoustic device includes a sound emitting unit 12, wherein the sound emitting unit 12 is a miniature sound emitting unit 12, more specifically, the sounding unit 12 is a miniature moving coil speaker. The sound unit 12 generally includes a housing and a vibration system and a magnetic circuit system accommodating and fixed in the housing. The vibration system includes a vibration diaphragm fixed on the housing and a voice coil combined with the vibration diaphragm. The magnetic circuit system forms There is a magnetic gap, and the voice coil is arranged in the magnetic gap. The voice coil reciprocates up and down in the magnetic field after the alternating current is applied, thereby driving the vibrating diaphragm to vibrate and produce sound.

The acoustic device of the present invention includes a first housing 21. The first housing 21 is divided into an upper housing 10 and a lower housing 14. The upper housing 10 and the lower housing 14 are enclosed to form a cavity. The sound generating unit 12 is arranged in the cavity to emit sound. The unit 12 realizes circuit conduction with an external circuit through the FPC13. The acoustic device is provided with a sound hole 103. In one embodiment, the upper shell 10 is provided with a sound hole 103. The sound wave on the front side of the vibrating diaphragm is radiated through the sound hole 103, and the sound wave on the back side of the vibrating diaphragm is retained. Inside the acoustic device. A cavity is formed between the vibrating diaphragm and the casing and the magnetic circuit system. Generally, a rear sound hole is opened on the casing or the magnetic circuit system or between the two. The sound waves on the rear side of the vibrating diaphragm will enter through the rear sound hole. Inside the acoustic device, preferably, rear sound holes are opened at the four corners of the sound unit 12. The vibration direction of the vibrating diaphragm of the sound generating unit 12 of the present invention is parallel to the thickness direction of the acoustic device, which is beneficial to the thin design of the acoustic device.

In this embodiment, the lower shell 14 of the acoustic device is provided with an opening 141 corresponding to the position of the sound unit 12, and the shape and size of the opening 141 are adapted to the sound unit 12. The magnetic circuit system of the sound unit 12 includes a magnetic yoke and a magnetic Embedded in the opening 141, it shows that the magnetic yoke is exposed to the acoustic device.

Further, a first sealed cavity 31 is formed on the rear side of the vibrating diaphragm. The cavity wall of the first sealed cavity 31 is the first housing 21. The first housing 21 is provided with a mounting hole 105, and the shape of the mounting hole 105 can be It is a circle, rectangle, square, ellipse, rhombus or irregular shape, which is not limited in the present invention. Preferably, the shape of the mounting hole 105 is a rectangle.

In the present invention, the first housing 21 is provided with a mounting hole 105, the mounting hole 105 is provided with a flexible deformation component covering the mounting hole 105, and a second sealed cavity 32 is provided outside the first sealed cavity 31, and the flexible deformation The component is located between the first sealed cavity 31 and the second sealed cavity 32, and the second sealed cavity 32 encloses the sound waves generated by the flexible deformable portion during deformation in the second sealed cavity 32.

In one embodiment, the protective device and the first housing 21 are integrally injection-molded with plastic materials, and there is no need to install the protective device separately later, which saves process procedures and costs.

The flexible deformation component includes a flexible deformation part and a protection device, and the protection device is located on a side of the flexible deformation part away from the first sealed cavity 31 to protect the flexible deformation part from damage. The protective device, the flexible deformable part and the first housing 21 are enclosed to form a cavity. The cavity has a top wall part directly opposite to the flexible deformable part and a side wall part connected to the top wall part. There is a vent 104 to connect the cavity formed by the side wall of the first housing 21, the flexible deformable portion, and the protective device and the second sealed cavity 32, so that the air pressure of the two can be balanced. The vent 104 is provided on the side wall of the first housing 21, that is, the vent 104 is separately formed by the side wall of the first housing 21, which is simple in structure and easy to assemble; or the protective device includes a top surface and a relatively flexible deformable part. On the side surface, the side surface of the protective device and the side wall of the first housing 21 are jointly enclosed to form a vent 104, which is formed by the side surface of the protective device and the side wall of the first housing 21 being recessed; One end is flat and the end is fixedly combined with the side wall of the first housing 21. The protective device and the side wall of the first housing 21 form a vent hole 104. The vent hole 104 extends from the first housing 21 to a distance away from the protective device. The direction is recessed. The protective device may be at least one of metal materials, PCB, PET, PEN, carbon fiber sheet, and ceramic sheet. Preferably, the protective device is a steel sheet 101. Based on the design of the steel sheet 101, the overall thickness can be reduced, which is beneficial to reduce The thickness of the small acoustic device. The steel sheet 101 is taken as an example for description below.

Preferably, the flexible deformation part is the diaphragm 11, the diaphragm 11 includes a coupling part, a folding ring, a central part and a reinforcing part. The coupling part is used to fix the diaphragm 11, the coupling part is fixed to the first housing 21, and the central part passes The folding ring is elastically suspended on the joint. Further, a reinforcing part is provided on the central part to improve the structural strength of the central part. In this embodiment, the reinforcing part is provided on the side of the central part away from the steel sheet 101 to avoid occupying the space between the diaphragm 11 and the steel sheet 101 to ensure the vibration space of the diaphragm 11. The folding ring protrudes toward the steel sheet 101 to reduce the thickness of the flexible deformable component. The central part is a monolithic structure or the central position of the central part is hollowed out. The strength of the reinforcing part is higher than that of the central part, and may be metal, plastic, carbon fiber or a composite structure thereof.

When the acoustic device is in working condition, when the vibrating diaphragm vibrates and compresses the volume of the rear side of the vibrating diaphragm toward the first sealed cavity 31, the sound pressure will be transmitted to the diaphragm 11 through the first sealed cavity 31, and the diaphragm 11 will face the first sealed cavity 31. The outer side of a housing 21 expands and deforms; on the contrary, when the vibrating diaphragm vibrates away from the first sealed cavity 31, the diaphragm 11 shrinks and deforms inwardly, thereby adjusting the volume of the first sealed cavity 31. Among them, the flexible deformable part may be a single-layer structure made of a layer of thermoplastic elastomer material or a multilayer composite structure of at least one layer of thermoplastic elastomer material. The thermoplastic elastomer material includes polyester, polyurethane, At least one of polyamide, polystyrene, polyolefin, dynamic vulcanized rubber, and blend type thermoplastic. Since the thermoplastic elastomer material has a certain degree of flexibility, it is easily deformed when affected by vibration, so that the flexible deformable portion can adjust the first sealed cavity 31. When the material of the flexible deformation part is not limited to the above-mentioned materials, it may also be some materials such as plastic, silicone, rubber, etc. that can realize flexible deformation. The following description takes the diaphragm 11 as an example.

In this embodiment, the main bodies of the first sealed cavity 31 and the second sealed cavity 32 extend along the horizontal direction formed by the length and width of the acoustic device. The horizontal direction can also be defined by a direction perpendicular to the thickness direction of the acoustic device. The horizontal direction generally refers to the direction parallel to the horizontal plane when the acoustic device is placed on a horizontal plane, and the two chambers are arranged along the horizontal direction, so as not to occupy the space in the height direction of the acoustic device as much as possible, which is beneficial to the thin design of the product .

In the acoustic device, by setting the diaphragm 11, the diaphragm 11 deforms with the sound pressure, and the volume of the first sealed cavity 31 is adjustable, thereby increasing the equivalent acoustic compliance of the first sealed cavity 31 and effectively reducing the resonance frequency of the acoustic device , Improve the low-frequency sensitivity; through the second sealed cavity 32 to isolate the sound radiation generated during the deformation process of the diaphragm 11, the radiated sound wave of the diaphragm 11 is enclosed inside the acoustic device, to avoid the opposite phase radiated sound wave of the diaphragm 11, The sound waves radiated in the forward direction of the unit 12 cause cancellation effects, thereby greatly improving the low frequency sensitivity of the product as a whole.

Moreover, in this embodiment, the volume of the second sealed cavity 32 is greater than the volume of the first sealed cavity 31, which can make the deformation of the diaphragm 11 easier, which is more conducive to increasing the equivalent sound of the first sealed cavity 31, and effectively reduces the acoustic device. Resonance frequency improves low frequency sensitivity.

In one embodiment, a supporting portion 106 is provided in the mounting hole 105, the diaphragm 11 and the steel sheet 101 are both fixed to the supporting portion 106, and the diaphragm 11 and the steel sheet 101 are respectively located on both sides of the supporting portion 106, that is, the steel sheet 101 The diaphragm 11 is located on the side of the supporting portion 106 away from the first sealed cavity 31, and the diaphragm 11 is located on the side of the supporting portion 106 close to the first sealed cavity 31. The supporting portion 106 is used to conveniently fix the diaphragm 11 and the steel sheet 101, and the supporting portion 106 separates the steel sheet 101 and the diaphragm 11 by a certain distance to provide a part of the vibration space for the diaphragm 11. The distance between the steel sheet 101 and the diaphragm 11 is set so that the diaphragm 11 will not collide with the steel sheet 101 when deformed.

In another embodiment, the first housing 21 is recessed in the direction of the first closed cavity 31 to form a mounting groove 107, the bottom of the mounting groove 107 is provided with a mounting hole 105, and the diaphragm 11 is fixed to the bottom of the groove and covers the mounting hole. 105, the steel sheet 101 is provided at the notch of the installation groove 107. The steel sheet 101 and the diaphragm 11 are both located on the same side of the first housing 21, which is convenient for assembly. At this time, the vent hole 104 penetrates the installation groove 107 to balance the air pressure in the inner space of the installation groove 107 and the second closed cavity 32. The distance between the steel sheet 101 and the diaphragm 11 is set so that the diaphragm 11 will not collide with the steel sheet 101 when deformed.

Specifically, the upper housing 10 is provided with a mounting groove 107, which is formed by the upper housing 10 being recessed in the direction of the first closed cavity 31. The shape of the mounting groove 107 matches the shape of the diaphragm 11, and the diaphragm 11 is installed in The installation groove 107 covers the installation hole 105. The first housing 21 of the acoustic device is provided with a mounting groove 107, which can effectively reduce the space occupied by the flexible deformable component of the acoustic device, reduce the thickness of the acoustic device, and does not occupy the volume of the second sealed cavity 32. The side wall of the installation groove 107 is perpendicular to the plane where the diaphragm 11 is located, or the side wall of the installation groove 107 is inclined to the plane of the diaphragm 11, and the area of the groove of the installation groove 107 is larger than the area of the bottom of the installation groove 107, increasing The volume of the installation tank 107.

The diaphragm 11 of the present invention can be fixed to the first housing 21 by applying glue or using double-sided tape. This type of process is simple, efficient and low-cost. Similarly, the steel sheet 101 and the first housing 21 can also be bonded. fixed.

In one embodiment, as shown in FIG. 6, one end of the steel sheet 101 close to the vent 104 is bent, and the steel sheet 101 and the first housing 21 are fixed by an injection molding structure. The curved shape can effectively improve the structural strength after injection molding. . The present invention does not limit the bending angle, as long as the structural strength after injection molding can be improved. Furthermore, the cross section of the steel sheet 101 is an "L" shape, and the shape of the vent hole 104 is optimized at one time to make the passage of the vent hole 104 smoother.

The acoustic device of the present invention also includes a first dust-proof net, the first dust-proof net covers the vent 104, and the first dust-proof net can effectively block external dust from entering the space between the steel sheet 101 and the diaphragm 11, thereby preventing The deformation of the diaphragm 11 causes interference, or even damages the diaphragm 11, thereby affecting the performance of the product. At the same time, the first dust-proof net helps to improve the appearance of the product, making the product more integrated. Preferably, the first dust-proof net is a mesh cloth 102. The mesh cloth 102 is attached to the vent 104 on the side wall of the first housing 21, the area of the mesh cloth 102 is reduced, the material cost can be reduced, and the quality management is beneficial. The sticking position of the mesh 102 reduces the difficulty of assembly and simplifies the assembly process.

In another embodiment, the steel sheet 101 is further provided with air-permeable micropores, which are used to connect the cavity formed by the first housing 21, the steel sheet 101, and the diaphragm 11 and the second closed cavity 32. The air pressure of the cavity and the second closed cavity 32 is further promoted. A second dust-proof net can also be arranged on the steel mesh 101 to prevent dust and the like from entering the cavity through the air-permeable micro-holes, which affects the product performance.

Preferably, at least a part of the housing of the electronic device for installing the acoustic device is used to form the first sealed cavity 31 and/or the second sealed cavity 32. Among them, the electronic device may be a mobile phone, a tablet computer, a notebook computer, etc. That is, part or all of the first housing 21 is composed of the housing of the electronic device, or the cavity wall of the second sealed cavity 327 is the second housing 22, and part or all of the second housing 22 is composed of the electronic device. Alternatively, part or all of the first housing 21 and the second housing 22 are constituted by the housing of the electronic device. In the present invention, the housing of the electronic device doubles as the first housing 21 and the second housing 22, which can make full use of the space inside the electronic device, while saving part of the space occupied by the cavity wall, which is more conducive to the thin design of the electronic device .

It should be noted that the “closed” described in the present embodiment and the present invention can be a fully closed physical structure or a relatively closed state. For example, the first airtight cavity 316 may include requirements based on product use, The pressure equalizing holes 21123 opened to balance the internal and external air pressure and have no significant effect on the rapid change of sound pressure, or other open-hole structures, are also regarded as closed chambers. For another example, the second airtight cavity 327 may include gaps generated when combined with the first airtight cavity 316, as well as gaps of its own structure, etc., which can effectively isolate the sound waves generated by the flexible deformable part and prevent the sound waves generated by the sound generating unit 12 There is no obvious effect, and it is also regarded as a closed cavity. In general, the total area of the above-mentioned openings or gaps does not exceed 20mm ² .

Specifically, the acoustic device includes a first housing 21. The sound generating unit 12 is mounted on the first housing 21 to form a sound generating assembly. A first closed cavity 31 is formed between the vibrating diaphragm of the sound generating unit 12 and the first housing 21. The first housing 21 is provided with a mounting hole 105, and the diaphragm 11 is provided on the mounting hole 105. The mounting hole 105 and the diaphragm 11 are not limited to one group, and multiple groups can be provided at different positions of the first housing 21 . The acoustic device includes a second housing 22. The sound generating component is installed in the second housing 22. A second sealed cavity 32 is formed between the second housing 22 and the first housing 21. Wherein, when there are other components in the second housing 22, the second sealed cavity 32 is actually formed by the gap between the components and the second housing 22 and the first housing 21.

In this embodiment, the sound generating unit 12 is arranged inside the first housing 21, and the two form an integral structure, and then are assembled with the second housing 22. The first housing 21 is provided with a through hole, and the front side space of the vibrating diaphragm is in communication with the through hole, and the sound is radiated to the sound hole 103 of the acoustic device through the through hole.

The acoustic device is installed in an electronic device such as a mobile phone, and the housing of the electronic device doubles as the second housing 22 of the acoustic device. The space between the housing and internal components of the electronic device and the first housing 21 of the acoustic device forms a second closed cavity 32, omitting the second housing 22 of the acoustic device itself, making full use of the electronic equipment housing components The gap space between the two can realize the maximized design of the second closed cavity 32.

The present invention provides an electronic device on which the acoustic device in the above-mentioned embodiment is installed. The electronic device may be a mobile phone, a tablet computer, a notebook, or the like.

The electronic device specifically includes a housing of the electronic device, and at least a part of the housing of the electronic device is used to form the first sealed cavity 31 and/or the second sealed cavity 32 of the acoustic device. That is, part or all of the first housing 21 is composed of the housing of the electronic device, or part or all of the second housing 22 is composed of the housing of the electronic device, or the first housing 21 and the second housing Part or all of 22 is formed by the housing of the electronic device. In the present invention, the housing of the electronic device doubles as the first housing 21 and the second housing 22, which can make full use of the space inside the electronic device, while saving part of the space occupied by the cavity wall, which is more conducive to the thin design of the electronic device .

In this specific embodiment, the acoustic device includes a first housing 21, the sound generating unit 12 is installed on the first housing 21 to form a sound generating assembly, and the vibration diaphragm of the sound generating unit 12 is between the first housing 21 A first sealed cavity 31 is formed between the first housing 21, a mounting hole 105 is opened on the first housing 21, and a diaphragm 11 is provided on the mounting hole 105. The mounting hole 105 and the diaphragm 11 are not limited to one set, and can Set multiple groups in different positions of 21. The acoustic device further includes a second housing 22. The sound generating component is installed in the second housing 22. A second sealed cavity 32 is formed between the second housing 22 and the first housing 21. Among them, the second housing 22 is the housing of the electronic device. In fact, the space between the housing of the electronic equipment and the internal components and the first housing 21 of the acoustic device forms a second closed cavity 32. The housing of the electronic equipment doubles as the second housing 22 of the acoustic device, and the acoustic device is omitted. The second housing 22 of its own makes full use of the gap space between the components of the housing of the electronic device, and can realize the maximum design of the second closed cavity 32, which is beneficial to the thin design of the electronic device.

With the above structure of the present invention, the first housing is provided with a mounting hole, and the mounting hole is provided with a flexible deformation assembly covering the mounting hole. The flexible deformation assembly includes a flexible deforming part and a protective device, and the protective device is arranged on the flexible deformable part away from the first On one side of a closed cavity, the protective device, the flexible deformable part and the first shell are enclosed to form a cavity. The cavity has a top wall part directly opposite to the flexible deformable part and a side wall part connected with the top wall part, A vent hole is provided on the side wall part, and the vent hole is used to communicate the cavity and the second closed cavity, and the protective device can effectively protect the flexible deformed part from damage and destruction. The protection device is a steel sheet, one end of the steel sheet is bent and arranged near the vent hole, and the steel sheet is injection-molded and combined with the first shell to increase the structural strength. The vent hole of the present invention is arranged on the side wall of the first housing, and the first dust-proof net is arranged on the vent hole. With this structure, the assembly process is simple and efficient, and the first dust-proof net does not require a large area, which reduces material costs .

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims

An acoustic device, characterized in that it comprises:

A sounding unit, the sounding unit includes a vibrating diaphragm, the acoustic device is provided with a sound outlet, and the sound wave on the front side of the vibrating diaphragm is radiated to the outside through the sound outlet;

The back side of the vibrating diaphragm forms a first sealed cavity, the cavity wall of the first sealed cavity is a first shell, and the first shell is provided with a mounting hole, and the mounting hole is provided with a cover The flexible deformation component of the mounting hole is provided with a second sealed cavity outside the first sealed cavity, and the flexible deformation component is located between the first sealed cavity and the second sealed cavity. The airtight cavity seals the sound waves generated by the flexible deformable part during deformation in the second airtight cavity;

The flexible deformation component includes a flexible deformation portion and a protection device, the protection device is provided on a side of the flexible deformation portion away from the first sealed cavity, the protection device, the flexible deformation portion and the first The shells are enclosed to form a cavity, the cavity has a top wall portion directly opposite to the flexible deformable portion and a side wall portion connected to the top wall portion, and a vent hole is provided on the side wall portion, the The vent is used to communicate the cavity and the second sealed cavity.
The acoustic device according to claim 1, wherein the vent is provided on the side wall of the first housing.
The acoustic device according to claim 1, wherein the vent is formed by enclosing the protective device and the side wall of the first housing.
The acoustic device according to claim 1, wherein a supporting part is provided in the mounting hole, the flexible deformable part and the protective device are both fixed to the supporting part, and the flexible deformable part and the The protection devices are respectively located on both sides of the supporting part.
The acoustic device according to claim 1, wherein the first housing is recessed in the direction of the first sealed cavity to form an installation groove, and the groove bottom of the installation groove is provided with the installation hole.
The acoustic device according to claim 5, wherein the flexible deformable portion is provided at the bottom of the groove and covers the installation hole, and the protection device is provided at the notch of the installation groove.
The acoustic device according to claim 4 or 6, wherein the flexible deformable part is fixed to the first housing by applying glue or using double-sided adhesive.
The acoustic device according to claim 1, wherein the protection device and the first housing are integrally injection molded with plastic materials.
The acoustic device according to claim 1, wherein the protective device is at least one of steel sheet, PCB, PET, PEN, carbon fiber sheet, and ceramic sheet.
The acoustic device according to claim 1, wherein the protection device and the first housing are fixed by injection molding.
The acoustic device according to claim 1, wherein the protection device and the first housing are fixed by bonding.
The acoustic device according to claim 1, further comprising a first dust-proof net, and the first dust-proof net is disposed on the vent hole.
The acoustic device according to claim 1, wherein the protective device is provided with air-permeable micropores.
The acoustic device according to claim 13, wherein the protective device is provided with a second dust-proof net covering the air-permeable micropores.
An electronic device, characterized in that it comprises a housing of the electronic device and the acoustic device according to claims 1-14.