WO2021031477A1

WO2021031477A1 - Acoustic device and electronic apparatus

Info

Publication number: WO2021031477A1
Application number: PCT/CN2019/126128
Authority: WO
Inventors: 李兆鹏; 张成飞; 陈国强
Original assignee: 歌尔股份有限公司
Priority date: 2019-08-20
Filing date: 2019-12-18
Publication date: 2021-02-25
Also published as: CN110572752A; CN110572752B

Abstract

Disclosed in the present invention is an acoustic device, comprising a sound production unit. A first closed cavity is formed in the rear side of a vibrating diaphragm of the sound production unit; a mounting hole is formed in a cavity wall of the 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 device covering at least one side of the flexible deformation portion; the protective device comprises a fixed portion, a bottom portion, and a side portion; the side portion is provided at the periphery of the bottom portion, and one end of the side portion along an axial direction is fixed with the bottom portion; the fixed portion is provided at the outer periphery of the other end of the side portion along the axial direction; the bottom portion and the side portion form a cover corresponding to the flexible deformation portion and the cover is mounted on a first housing by means of the fixed portion; a communicating hole is provided on the protective device. The flexible deformation portion of the acoustic device in the present invention is protected by the protective device, thereby avoiding damage and impact on 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 the deformation is enclosed in the second sealed cavity; the flexible deformation component includes a flexible deformation portion and a protective device covering at least one side of the flexible deformation portion, and the protective device includes a fixed portion, a bottom and a side Part, the side part is provided on the periphery of the bottom part, one end of the side part in the axial direction is combined and fixed with the bottom part, and the fixing part is provided on the outer periphery of the other end of the side part in the axial direction, The bottom part and the side part form a cover corresponding to the flexible deformable part and are mounted on the first housing through the fixing part, and a communication hole is provided on the protection device.

Optionally, the protective device is provided on a side of the flexible deformable portion away from the first sealed cavity.

Optionally, the protection device is provided on both sides of the flexible deforming part.

Optionally, the fixed part and the flexible deformable part are fixedly connected so that the protective device and the flexible deformable part are integrated into one body, and the flexible deformable part is fixedly connected with the first housing. .

Optionally, the flexible deformable part covers the mounting hole, the fixed part is fixed on the first housing, and the fixed part is located in a projection direction perpendicular to the plane where the flexible deformable part is located. The periphery of the flexible deformable part.

Optionally, the first housing corresponding to the mounting hole is recessed in the direction of the first closed cavity to form a mounting groove, and the flexible deformation component is mounted on the bottom of the mounting groove and covers the mounting hole .

Optionally, the flexible deformable component does not exceed the plane where the notch of the installation slot is located.

Optionally, a side wall of the installation groove is recessed in a direction away from the flexible deformation component to form a glue injection groove.

Optionally, it further includes a dust-proof net, the dust-proof net is arranged in the installation groove, and the flexible deformable component is located in a space enclosed by the dust-proof net and the first housing.

Optionally, the communication hole is provided at the bottom, and an exhaust hole is provided on the bottom and/or side.

Optionally, a side wall of the first housing corresponding to the installation groove is provided with an exhaust groove connecting the internal space of the installation groove and the second sealed cavity, and the exhaust groove is connected to the exhaust The holes are set correspondingly.

Optionally, the protective device is a steel mesh.

Optionally, the dust-proof net is a mesh cloth.

Optionally, the volume of the second sealed cavity is greater than the volume of the first sealed cavity; at least a part of the housing of the electronic device for installing the acoustic device is used to form the first sealed cavity and/or the first sealed cavity Two airtight cavity.

Optionally, the first housing includes an upper housing and a lower housing, the magnetic circuit system of the sound unit includes a magnetic yoke, the mounting hole is provided in the upper housing, and the flexible deformation component is mounted on the The mounting hole, the lower shell is provided with an opening, and the magnetic conductive yoke is embedded in the opening.

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, and the flexible deformation component includes a flexible deformation part and a cover on the flexible deformation The protection device on at least one side of the side portion, the protection device includes a fixed portion, a bottom portion and a side portion. The side portion is provided on the periphery of the bottom portion. The outer periphery, bottom and side portions of one end form a cover corresponding to the flexible deformable portion and are mounted on the first housing through the fixing portion, and the protective device is provided with a communication hole. In this way, the flexible deformable part is covered with a protective device to protect the flexible deformable 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;

Figure 3 is a top view of another embodiment of the acoustic device of the present invention with the dust-proof net removed;

Figure 4 is a cross-sectional view of another embodiment of the acoustic device of the present invention;

5 is a schematic diagram of the assembly structure of the upper shell and the flexible deformation component in another embodiment of the acoustic device of the present invention;

6 is a schematic diagram of the assembly structure of the upper shell and the protective device in another embodiment of the acoustic device of the present invention;

7 is a schematic diagram of the assembly structure of the lower shell and the sound unit in another embodiment of the acoustic device of the present invention;

Fig. 8 is a structural schematic diagram of the steel mesh in an embodiment of the acoustic device of the present invention;

9 is a schematic diagram of the structure of the diaphragm in an embodiment of the acoustic device of the present invention;

Figure 10 is a cross-sectional view of a flexible deformable component in an embodiment of the acoustic device of the present invention;

Figure 11 is a top view of the steel mesh in an embodiment of the acoustic device of the present invention;

Fig. 12 is a cross-sectional view of another embodiment of the acoustic device of the present invention.

Description with icon number:

1 is a flexible deformable component, 11 is a steel mesh, 111 is a bottom part, 112 is a side part, 113 is a fixed part, 114 is a connecting hole, 115 is an exhaust hole, 12 is a diaphragm, 121 is a joint part, and 122 is a folding ring , 123 is the central part, 124 is the reinforcing part, 2 is the first shell, 21 is the upper shell, 211 is the mounting hole, 212 is the sound hole, 214 is the mounting groove, 215 is the glue injection groove, and 216 is the exhaust Slot, 22 is the lower shell, 221 is the opening, 23 is the pressure equalizing hole, 3 is the sound unit, 31 is the magnetic yoke, 4 is the FPC, 5 is the second shell, 6 is the first closed cavity, 7 is the second Closed 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.

The acoustic device includes a sounding unit 3, as shown in Figs. 1-3, wherein the sounding unit 3 is a miniature sounding unit 3, more specifically, the sounding unit 3 is a miniature moving coil speaker. The sound unit 3 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 2. The first housing 2 is divided into an upper housing 21 and a lower housing 22. The upper housing 21 and the lower housing 22 are enclosed to form a cavity. The sound unit 3 is arranged in the cavity to emit sound. Unit 3 realizes circuit conduction with an external circuit through FPC4. The acoustic device is provided with a sound hole 212. In one embodiment, the upper shell 21 is provided with a sound hole 212. The sound wave on the front side of the vibrating diaphragm is radiated through the sound hole 212, 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. In the interior of the acoustic device, preferably, rear sound holes are opened in the four corners of the sound unit 3. The vibration direction of the vibration diaphragm of the sound generating unit 3 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, as shown in FIG. 7, the lower shell 22 of the acoustic device is provided with an opening 221 at a position corresponding to the sounding unit 3. The shape and size of the opening 221 are adapted to the sounding unit 3. The magnetic circuit system of the sounding unit 3 includes The magnetically conductive yoke 31 is embedded in the opening 221, showing that the magnetically conductive yoke 31 is exposed to the acoustic device.

Further, a first sealed cavity 6 is formed on the back side of the vibrating diaphragm, and a mounting hole 211 is opened on the cavity wall of the first sealed cavity 6. The shape of the mounting hole 211 can be circular, rectangular, square, elliptical, diamond or Irregular patterns, the present invention does not limit this. Preferably, the shape of the mounting hole 211 is rectangular. The cavity wall of the first airtight cavity 6 is the above-mentioned first housing 2.

In the present invention, the first housing 2 is provided with a mounting hole 211, the mounting hole 211 is provided with a flexible deformation assembly 1 covering the mounting hole 211, and a second sealed cavity 7 is provided on the outside of the first sealed cavity 6. The deformable component 1 is located between the first sealed cavity 6 and the second sealed cavity 7, and the second sealed cavity 7 encloses the sound waves generated by the flexible deformable part during deformation in the second sealed cavity 7.

The flexible deformation component 1 includes a flexible deformation portion and a protective device covering at least one side of the flexible deformation portion. Preferably, as shown in FIGS. 8-11, the protective device is located on the side of the flexible deformation portion away from the first sealed cavity 6 for Protect the flexible deformation part from damage. The protective device can also be provided on both sides of the flexible deformable part, and the protective device facing the first sealed cavity 6 can isolate the sound-absorbing material filled in the first sealed cavity 6. The protective device is made of hard material, which can be metal, plastic, etc. Preferably, the protective device is a steel mesh 11, which can reduce the overall thickness based on the design of the steel mesh 11, which is beneficial to reduce the thickness of the acoustic device. The following description takes the steel mesh 11 as an example.

As shown in Figure 4, preferably, the first housing 2 corresponding to the mounting hole 211 is recessed in the direction of the first closed cavity 6 to form a mounting groove 214, and the bottom of the mounting groove 214 is provided with a flexible deformation component covering the mounting hole 211 1. The shape of the flexible deformable component 1 matches the shape of the mounting hole 211. Further, the flexible deformable component 1 does not exceed the plane where the notch of the mounting groove 214 is located. In this way, the contact probability of the external component to the flexible deformable component 1 is greatly reduced, while preventing scratching.

In one embodiment, the flexible deformable portion is the diaphragm 12, the diaphragm 12 includes a coupling portion 121, a folding ring 122, a central portion 123, and a reinforcing portion 124. The coupling portion 121 is used to fix the diaphragm 12, and the coupling portion 121 is clamped in Between the bottom of the mounting groove 214 and the fixing portion 113, the central portion 123 is elastically suspended from the coupling portion 121 by a folding ring 122, and a reinforcing portion 124 is provided on the central portion 123 for structural strength of the central portion 123. In this embodiment, the reinforcing part 124 is provided on the side of the central part 123 away from the bottom 111 to avoid occupying the space between the flexible deformable part and the steel mesh 11 to ensure the vibration space of the flexible deformable part. The folding ring 122 protrudes toward the steel mesh 11 to reduce the thickness of the flexible deformation component 1. The central portion 123 is an integral structure or the central position of the central portion 123 is hollowed out. The strength of the reinforcing portion 124 is higher than the strength of the central portion 123, and may be metal, plastic, carbon fiber, or a composite structure thereof. The following uses the diaphragm 12 as an example for description.

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 6, the sound pressure will be transmitted to the diaphragm 12 through the first sealed cavity 6, and the diaphragm 12 will face the first sealed cavity 6. The outer side of the housing 2 expands and deforms; on the contrary, when the vibrating diaphragm vibrates away from the first sealed cavity 6, the diaphragm 12 shrinks and deforms inwardly, thereby adjusting the volume of the first sealed cavity 6. Wherein, the diaphragm 12 can 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 easy to deform when affected by vibration, so that the diaphragm 12 can adjust the first closed cavity 6. When the material of the diaphragm 12 is not limited to the above materials, it may also be some materials such as plastic, silicone, rubber, etc. that can achieve flexible deformation.

The steel mesh 11 includes a fixed portion 113, a bottom portion 111, and a side portion 112. The side portion 112 is provided on the periphery of the bottom portion 111. One end of the side portion 112 in the axial direction is combined and fixed with the bottom portion 111. The fixed portion 113 is provided on the side portion 112 along the axial direction. At the other end of the outer periphery, the bottom 111 and the side 112 form a cover corresponding to the diaphragm 12 and are mounted on the first housing 2 through the fixing part 113. The steel mesh 11 can be generally regarded as a basin, and the fixing part 113 is For "bowl edge", the bottom 111 is the "basin", and the side 112 is the "bowl wall". The side 112 and the bottom 111 can form part of the vibration space of the diaphragm 12. The distance between the bottom 111 and the diaphragm 12 is set so that the diaphragm 12 will not collide with the steel mesh 11 when deformed. The steel mesh 11 is provided with communicating holes 114 for equalizing the sound pressure on both sides of the steel mesh 11.

The steel mesh 11 can prevent external objects from damaging and damaging the diaphragm 12, and when the diaphragm 12 vibrates and deforms, the steel mesh 11 has a certain damping effect on the deformation of the diaphragm 12, so that the diaphragm 12 deforms and adjusts with the sound pressure. When the first airtight cavity 6 is compliant, it can reduce the interference to the entire acoustic device, and even reduce the interference to the entire acoustic device application electronic equipment.

Specifically, the steel mesh 11 is arranged on the side of the diaphragm 12 away from the first sealed cavity 6 to cover the mounting hole 211. The bottom 111 of the steel mesh 11 is at a certain distance from the diaphragm 12 to ensure the deformation space of the diaphragm 12, It also has a protective and dustproof effect on the diaphragm 12, as well as a certain damping effect.

When the vibrating diaphragm vibrates, the internal sound pressure of the first sealed cavity 6 changes, and the diaphragm 12 deforms with the change of the sound pressure of the first sealed cavity 6, and the volume of the first sealed cavity 6 is flexibly adjusted; The second airtight cavity 7 encloses the sound wave generated by the diaphragm 12 during deformation in the second airtight cavity 7.

In one embodiment, the diaphragm 12 covers the mounting hole 211, the fixing portion 113 is fixed on the first housing 2, and the fixing portion 113 is located at the periphery of the diaphragm 12 along the projection direction perpendicular to the plane where the diaphragm 12 is located. That is, the diaphragm 12 is located inside the inner edge of the fixed portion 113.

In a preferred embodiment, the fixing portion 113 is fixedly connected to the diaphragm 12 so that the steel mesh 11 and the diaphragm 12 are combined into one body, and the diaphragm 12 is fixedly connected to the first housing 2. At this time, the diaphragm 12 and the steel mesh 11 are combined as a whole, which facilitates the subsequent assembly of the acoustic device, simplifies the assembly process, and improves the efficiency and product yield.

Preferably, at least a part of the housing of the electronic device for installing the acoustic device is used to form the first airtight cavity 6 and/or the second airtight cavity 7. 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 2 is formed by the housing of the electronic device, or part or all of the cavity wall of the second airtight cavity 7 is formed by the housing of the electronic device, or the first airtight cavity 6 and Part or all of the cavity wall of the second airtight cavity 7 is formed by the housing of the electronic device. In the present invention, the housing of the electronic device doubles as the cavity wall of the first airtight cavity 6 and/or the second airtight cavity 7, which can make full use of the space inside the electronic device while saving a part of the space occupied by the cavity wall, which is more conducive to electronics The thin design of the device. The cavity wall of the second airtight cavity 7 is the above-mentioned second housing 5.

Optionally, as shown in FIG. 12, the housing of the electronic device includes a main board and other components. Taking the main board as an example, the main board and the housing of the fixed sound generating unit 3 and the flexible deformation assembly 1 are jointly enclosed to form a first airtight cavity 6. The connection between the sounding unit 3 and the housing of the flexible deformation assembly 1 and the main board is sealed and fixed by foam.

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 closed cavity 6 may include requirements based on product use, The pressure equalization holes 23 opened to balance the internal and external air pressure and have no significant effect on the rapid changes of sound pressure, or other open-hole structures, are also regarded as closed chambers. For another example, the second airtight cavity 7 may include the gaps generated when combined with the first airtight cavity 6 and the gaps of its own structure. They can effectively isolate the sound waves generated by the diaphragm 12 and have no effect on the sound waves generated by the sound unit. Obvious influence is also regarded as a closed cavity. In general, the total area of the above-mentioned openings or gaps does not exceed 20mm ² .

In one embodiment, the bottom 111 is provided with communicating holes 114 to equalize the air pressure on both sides of the bottom 111 and at the same time facilitate the propagation of sound waves. The number of communicating holes 114 is not limited and can be set according to actual needs. An exhaust hole 115 is formed on the bottom 111 and/or the side 112. When the bottom 111 of the steel mesh 11 is too close or close to the components of the electronic device, the communication hole 114 may not have smooth air flow. At this time, the exhaust The hole 115 can function to equalize the air pressure.

Preferably, the exhaust hole 115 is formed at the junction of the bottom 111 and the side 112, which can avoid the influence of the components of the electronic device on the airflow of the bottom 111 and the influence of the components of the electronic device on the airflow of the side 112.

In one embodiment, the upper shell 21 is provided with a mounting groove 214, which is formed by recessing the upper shell 21 in the direction of the first airtight cavity 6. The shape of the mounting groove 214 matches the shape of the flexible deformable component 1, and is flexible The deformable component 1 is installed in the installation groove 214 to cover the installation hole 211. The first housing 2 of the acoustic device is provided with a mounting groove 214, which can effectively reduce the space occupied by the flexible deformable component 1 of the acoustic device, reduce the thickness of the acoustic device, and will not occupy the volume of the second closed cavity 7. The side wall of the mounting groove 214 is perpendicular to the plane where the diaphragm 12 is located, and the gap between the side portion 112 and the side wall of the mounting groove 214 is small, thereby effectively ensuring the volume of the first sealed cavity 6.

Or the side wall of the installation groove 214 and the plane of the diaphragm 12 are inclined at a certain angle, and the slot area of the installation groove 214 is larger than the area of the bottom of the installation groove 214, which facilitates the injection of glue between the side 112 and the side wall of the installation groove 214 .

Preferably, as shown in FIG. 5, the side wall of the installation groove 214 is perpendicular to the plane where the diaphragm 12 is located, and the side wall of the installation groove 214 is recessed in a direction away from the flexible deformation component 1 to form a glue injection groove 215, which ensures that the first In the case of the volume of the airtight cavity 6, it is convenient to inject glue and increase the volume of the fixed portion 113. In one embodiment, the top view of the flexible deformable component 1 is a rectangle, and the air vent 115 and the glue injection groove 215 are arranged at intervals around the rectangle.

In one embodiment, the corresponding side wall of the first housing 2 is provided with an exhaust groove 216 communicating the internal space of the installation groove 214 and the second closed cavity 7, and the exhaust groove 216 is provided corresponding to the exhaust hole 115. The above design enables the sound waves generated by the vibration of the diaphragm 12 to be transmitted to the second sealed cavity 7 through the exhaust groove 216, which can prevent the side of the diaphragm 12 facing the second sealed cavity 7 from being in the second sealed cavity 7 during assembly. The other parts of the device block and cause the low-frequency sensitivity increase to decrease or fail.

As shown in Figures 2, 4, and 6, the acoustic device of the present invention further includes a dust-proof net 8, which is covered by the installation groove 214, and the flexible deformable component 1 is located in the dust-proof net 8 and enclosed by the first housing 2. In the space formed. The arrangement of the dust-proof net 8 can effectively block external dust from entering the first sealed cavity 6, thereby affecting the performance of the product, and at the same time, it can improve the appearance of the product and make the product more integrated. Preferably, the dust-proof net 8 is a mesh cloth with a simple structure and convenient installation.

As a specific embodiment, the acoustic device includes a first housing 2. The sound generating unit 3 is mounted on the first housing 2 to form a sound generating assembly, and a first airtight is formed between the vibrating diaphragm of the sound generating unit 1 and the first housing 2 In the cavity 6, a mounting hole 211 is opened on the first housing 2, and a diaphragm 12 is provided on the mounting hole 211. The mounting hole 211 and the diaphragm 12 are not limited to one set, and can be different in the first housing 2. Set multiple groups of locations. The acoustic device includes a second housing 5, the sound generating component is installed in the second housing 5, and a second sealed cavity 7 is formed between the second housing 5 and the first housing 2. Wherein, when there are other components in the second housing 5, the second sealed cavity 7 is actually constituted by the gap between the components and the second housing 5 and the first housing 2.

In this embodiment, the sound generating unit 3 is arranged inside the first housing 2, and the two form an integral structure, and then are assembled with the second housing 5. The first housing 2 is provided with a through hole, and the front side space of the vibrating diaphragm is communicated with the through hole, and the sound is radiated to the sound hole 212 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 5 of the acoustic device. The space between the housing and internal components of the electronic equipment and the first housing 2 of the acoustic device forms a second closed cavity 7, omitting the second housing 5 of the acoustic device itself, and 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 7.

In this embodiment, the main bodies of the first airtight cavity 6 and the second airtight cavity 7 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 12, the diaphragm 12 deforms with the sound pressure, and the volume of the first sealed cavity 6 is adjustable, thereby increasing the equivalent sound of the first sealed cavity 6 and effectively reducing the resonance frequency of the acoustic device , Improve low-frequency sensitivity; through the second sealed cavity 7 to isolate the sound radiation generated during the deformation process of the diaphragm 12, the radiated sound wave of the diaphragm 12 is enclosed inside the acoustic device to avoid the opposite phase radiated sound wave of the diaphragm 12, The sound waves radiated in the forward direction of the unit 3 cause a cancellation effect, thereby greatly improving the low frequency sensitivity of the product as a whole.

Moreover, the volume of the second sealed cavity 7 in this embodiment is greater than the volume of the first sealed cavity 6, which can make the deformation of the diaphragm 12 easier, which is more conducive to increasing the equivalent sound of the first sealed cavity 6, and effectively reduces the acoustic device Resonance frequency improves low frequency sensitivity.

The invention also provides an assembling method of the acoustic device. The method includes: first fixing and combining the diaphragm 12 and the protective device to form the flexible deformable component 1, the flexible deformable component 1 as a whole covering the mounting hole of the first housing 2, and finally the first housing 2 and the flexible deformable component The joint of 1 is injected with glue to seal and fix.

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 6 and/or the second sealed cavity 7 of the acoustic device. That is, part or all of the first housing 2 is formed by the housing of the electronic device, or part or all of the second housing 5 is formed by the housing of the electronic device, or the first sealed cavity 6 and the second housing Part or all of 5 is constituted by the housing of the electronic device. In the present invention, the housing of the electronic device doubles as the first housing 2 and the second housing 5, which can make full use of the space inside the electronic device, while saving a 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 2, the sound generating unit 3 is mounted on the first housing 2 to form a sound generating assembly, and the vibration diaphragm of the sound generating unit 3 is connected to the first housing 2 A first sealed cavity 6 is formed between the first housing 2 and a mounting hole 211 is opened on the first housing 2, and a diaphragm 12 is provided on the mounting hole 211. The mounting hole 211 and the diaphragm 12 are not limited to one set, and can be installed in the first housing 2. Multiple groups are set at different positions of body 2. The acoustic device further includes a second housing 5. The sound generating component is installed in the second housing 5. A second sealed cavity 7 is formed between the second housing 5 and the first housing 2. Among them, the second housing 5 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 2 of the acoustic device forms a second closed cavity 7. The housing of the electronic equipment doubles as the second housing 5 of the acoustic device, and the acoustic device is omitted. The second housing 5 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 sealed cavity, which is beneficial to the thin design of the electronic device.

By adopting the above structure and assembly method of the present invention, the basin-shaped protective device is covered on the flexible deformation part to avoid damage to the flexible deformation part during use or assembly. The flexible deformation component can also be installed as a whole on the first part of the acoustic device. The shell can effectively reduce the assembly process, avoid defects caused by the soft material of the flexible deformed part, improve efficiency and yield, and is beneficial to the automatic feeding pot-like protective device to provide a part of the vibration space for the flexible deformed part. At the same time, compared with the flat steel mesh, the basin-shaped protective device occupies a relatively small space in the length and width directions of the acoustic device, and the basin-shaped protective device has a strong structure and is not easy to deform, so as to avoid abnormal dimensions due to deformation of parts. Cause poor performance.

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 a mounting hole is opened on the first shell, and a covering is provided at the mounting hole. 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 deformable component includes a flexible deformable portion and a protective device covering at least one side of the flexible deformable portion. The protective device includes a fixed portion, a bottom, and a side portion. The side portion is provided on the periphery of the bottom. One end of the side portion in the axial direction is combined and fixed with the bottom portion, the fixing portion is provided on the outer periphery of the other end of the side portion in the axial direction, and the bottom portion and the side portion form a corresponding flexible deformable portion The cover body is mounted on the first housing through the fixing part, and a communication hole is provided on the protection device.
The acoustic device according to claim 1, wherein the protection device is provided on a side of the flexible deformable portion away from the first sealed cavity.
The acoustic device according to claim 1, wherein the protection device is provided on both sides of the flexible deforming part.
The acoustic device according to claim 2, wherein the fixing part is fixedly connected to the flexible deformable part so that the protective device and the flexible deformable part are integrated into one body, and the flexible deformable part is connected to the second A shell is fixedly connected.
The acoustic device according to claim 1, wherein the flexible deformable portion covers the mounting hole, and the fixed portion is fixed on the first housing along a direction perpendicular to the flexible deformable portion. The projection direction of the plane, the fixing part is located at the periphery of the flexible deforming part.
The acoustic device according to any one of claims 1 to 4, wherein the first housing corresponding to the mounting hole is recessed toward the first closed cavity to form a mounting groove, and the flexible deformable component It is installed at the bottom of the installation groove and covers the installation hole.
7. The acoustic device according to claim 6, wherein the flexible deformable component does not exceed a plane where the notch of the installation slot is located.
7. The acoustic device according to claim 6, wherein the side wall of the mounting groove is recessed in a direction away from the flexible deformable component to form a glue injection groove.
The acoustic device according to claim 6, further comprising a dust-proof net, the dust-proof net is provided in the installation groove, and the flexible deformable component is located between the dust-proof net and the first housing In the space formed by the body enclosure.
The acoustic device according to claim 6, wherein the communication hole is provided at the bottom, and an exhaust hole is provided on the bottom and/or side.
The acoustic device according to claim 10, wherein the first housing is provided with an exhaust groove connecting the internal space of the installation groove and the second closed cavity at a side wall corresponding to the installation groove. The exhaust groove is provided corresponding to the exhaust hole.
The acoustic device according to claim 1, wherein the protective device is a steel mesh.
The acoustic device according to claim 9, wherein the dust-proof net is a mesh cloth.
The acoustic device according to claim 1, wherein the volume of the second sealed cavity is greater than the volume of the first sealed cavity;

At least a part of the housing of the electronic device for installing the acoustic device is used to form the first airtight cavity and/or the second airtight cavity.
The acoustic device according to claim 1, wherein the first casing comprises an upper casing and a lower casing, the magnetic circuit system of the sound unit comprises a magnetic yoke, and the mounting hole is provided in the upper casing The flexible deformation component is installed in the installation hole, the lower shell is provided with an opening, and the magnetic conductive yoke is embedded in the opening.
An electronic device, characterized in that the electronic device comprises a housing of the electronic device and the acoustic device according to claims 1-15.