WO2021088212A1

WO2021088212A1 - Acoustic apparatus and electronic device

Info

Publication number: WO2021088212A1
Application number: PCT/CN2019/126124
Authority: WO
Inventors: 郝正恩; 张军
Original assignee: 歌尔股份有限公司
Priority date: 2019-11-09
Filing date: 2019-12-18
Publication date: 2021-05-14
Also published as: CN110830894A

Abstract

Disclosed is an acoustic apparatus, comprising a sound producing unit and a first housing. The sound producing unit comprises a vibrating diaphragm, and the first housing and the vibrating diaphragm enclose to form a first closed cavity. A mounting hole is formed in the first housing, and a flexible deformation portion covering the mounting hole is provided at the mounting hole. A second closed cavity is formed at the outer side of the first closed cavity, and the flexible deformation portion is located between the first closed cavity and the second closed cavity. An air-permeable isolation assembly is provided in the first closed cavity, the first closed cavity is filled with a sound-absorbing material, and the air-permeable isolation assembly is used for isolating the sound-absorbing material from the flexible deformation portion and the sound producing unit. The air-permeable isolation assembly at least comprises one insertion air-permeable isolation member, the inner wall of the first housing is provided with a slot, and the insertion air-permeable isolation member is inserted into the slot. Also disclosed is an electronic device. The electronic device comprises a housing and the acoustic apparatus. The acoustic apparatus in the present invention is excellent in acoustic performance.

Description

Acoustic device and electronic equipment

Technical field

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

Background technique

Generally speaking, an acoustic system with a traditional structure includes a closed box and a sound unit arranged on the closed box. A cavity is formed between the closed box and the sound unit. Due to the volume limitation of the cavity in the acoustic system, the acoustic system In particular, it is difficult for a small acoustic system to reproduce bass satisfactorily. Conventionally, in order to achieve satisfactory bass reproduction in an acoustic system, two methods are usually used. One is to install sound-absorbing materials (such as activated carbon, zeolite, etc.) in the cabinet of the acoustic system for adsorption or desorption. The gas in the body has the effect of increasing the volume and reducing the low-frequency resonance frequency. The other is to install a passive radiator on the box of the acoustic system. The sound unit and the passive radiator radiate sound to the outside at the same time, using the passive radiator and the box. The principle that the body forms a strong resonance at a specific frequency point fp (resonance frequency point), which connects and superimposes the sound waves of the sound unit and the passive radiator to enhance the local sensitivity near the resonance frequency point fp (for example, see patent CN1939086A).

However, there are problems with the above two methods. The first is that when the size and volume of the cavity are limited, the effect of simply filling the sound-absorbing material on the low-frequency sensitivity is not good; the second is the use of passive radiators. Near the resonance frequency point fp, the passive radiator radiates strongly, and the sound unit is almost stopped. Therefore, the high sensitivity design of the passive radiator can achieve the local sensitivity enhancement of the acoustic system in the frequency band near fp; but in the frequency band below fp, the passive radiator Contrary to the phase of the sound waves of the sound unit, the sound waves cancel each other out, and the passive radiator has a negative effect on the sensitivity of the acoustic system. In a word, the passive radiator can only improve the sensitivity of the frequency band near the resonance point, and cannot improve all the low frequency bands. Therefore, it is necessary to further improve the defects of the existing technology.

Summary of the invention

An object of the present invention is to provide a new cavity structure, which can increase the equivalent volume of the back cavity, reduce the resonance frequency, and improve the low-frequency sound effect by combining the sound-absorbing material and placing it in a closed cavity.

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

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

The first housing, the first housing and the vibrating diaphragm are enclosed to form a first closed cavity, the first housing is provided with a mounting hole, and the mounting hole is provided with a cover covering the mounting hole The flexible deformable part is provided with a second hermetic cavity outside the first hermetic cavity, the flexible deformable part is located between the first hermetic cavity and the second hermetic cavity, and the second hermetic cavity The sound waves generated by the flexible deformable portion during deformation are enclosed in the second sealed cavity;

The first airtight cavity is provided with an air-permeable isolation component, the first airtight cavity is filled with a sound-absorbing material, and the air-permeable isolation component is used to isolate the sound-absorbing material from the flexible deformable part and the sound unit, so The air-permeable isolation assembly includes at least one inserted air-permeable spacer, an inner wall of the first housing is provided with a slot, and the inserted air-permeable spacer is inserted into the slot.

Optionally, the sounding unit and the flexible deformable portion are located on the same side of the inserted breathable spacer, the other side of the inserted breathable spacer, the inserted breathable spacer and the first The space enclosed by the shell is filled with the sound-absorbing material.

Optionally, the air-permeable isolation assembly includes two inserted air-permeable spacers, and the two inserted air-permeable spacers are enclosed with the first housing to form a space for filling the sound-absorbing material.

Optionally, the plane on which the inserted breathable spacer is located is parallel to the vibration direction of the flexible deformable part.

Optionally, the air-permeable isolation assembly further includes an air-permeable isolation member, and the edge of the air-permeable isolation member and the first housing are combined into one body by means of gluing, injection molding or hot melt.

Optionally, the plane where the air-permeable spacer is located is perpendicular to the vibration direction of the flexible deformable part.

Optionally, the edge thickness of the inserted air-permeable spacer is equal to the width of the slot in the thickness direction of the inserted air-permeable spacer.

Optionally, the breathable spacer and/or the inserted breathable spacer comprises a mesh cloth, a metal mesh or a breathable film.

In order to achieve the foregoing and other objectives, the present invention provides an electronic device that includes a housing and the above-mentioned acoustic device, at least a part of the housing is used to form the first airtight cavity and/or the second airtight Cavity.

Optionally, a part of the housing and the first housing encloses to form the second sealed cavity.

The technical effect of the present invention is at least that, in the acoustic device of the present invention, the first housing and the vibrating diaphragm are enclosed to form a first closed cavity, the first housing is provided with a mounting hole, and the mounting hole is provided with a flexible deformable part, By providing the flexible deformation part, the flexible deformation part deforms with the sound, so that the volume of the first closed cavity can be adjusted, thereby increasing the equivalent acoustic compliance of the first closed cavity, effectively reducing the resonance frequency of the acoustic device, improving low-frequency sensitivity, and , The first airtight cavity is provided with a breathable isolation component, and the first airtight cavity is filled with sound-absorbing material. The air-permeable isolation component is used to isolate the sound-absorbing material from the flexible deformable part and the sound unit. A slot is provided on the inner wall of the first shell, and the breathable spacer is inserted into the slot to improve the acoustic performance of the acoustic device.

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 the first embodiment of the acoustic device of the present invention;

Figure 2 is a cross-sectional view of a second embodiment of the acoustic device of the present invention;

Figure 3 is an exploded view of the third embodiment of the acoustic device of the present invention;

Fig. 4 is a cross-sectional view of the third embodiment of the acoustic device of the present invention.

Attached icon number description:

10 is the sounding monomer, 11 is the first shell, 111 is the lower shell, 112 is the upper shell, 113 is the mounting hole, 12 is the second shell, 13 is the first airtight cavity, 14 is the second airtight cavity, 15 It is a breathable spacer, 16 is a flexible deformable part, 17 is a sound-absorbing material, and 18 is an inserted breathable spacer.

Detailed ways

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 of components and steps, numerical expressions and numerical values 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 examples shown and discussed herein, any specific value should be interpreted as merely exemplary, rather than as a limitation. 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, and therefore, once an 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 Fig. 1, the acoustic device includes a sound emitting unit 10, wherein the sound emitting unit 10 is a miniature sound emitting unit 10, more specifically, the sound emitting unit 10 is a miniature moving coil speaker. The sound unit 10 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, the voice coil is arranged in the magnetic gap, and 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 is provided with a sound outlet (not shown), the sound wave on the front side of the vibrating diaphragm is radiated to the outside through the sound outlet, and the sound wave on the back side of the vibrating diaphragm is left inside the acoustic device. A cavity is formed between the vibrating diaphragm, the housing of the sound unit 10 and the magnetic circuit system. Preferably, the vibration direction of the vibrating diaphragm of the sound generating unit 10 is parallel to the thickness direction of the acoustic device, which is beneficial to the thin design of the acoustic device.

Further, as shown in FIG. 1, the acoustic device includes a first housing 11 and a second housing 12. The first housing 11 and the vibrating diaphragm form a first sealed cavity 13, and the outer side of the first sealed cavity 13 is provided There is a second airtight cavity 14. The second airtight cavity 14 is enclosed by the second housing 12 and the first housing 11, the first airtight cavity 13 is adjacent to the vibrating diaphragm, and the second airtight cavity 14 is away from the vibrating diaphragm. In order to solve the problems in the prior art that a single sound absorbing material 17 is used to improve the sensitivity of the low frequency range and the frequency range that can be improved when a single passive radiator structure is used is relatively limited, in the present invention, the first housing 11 is provided with There is a mounting hole 113, and the mounting hole 113 is provided with a flexible deformable portion 16 covering the mounting hole 113, wherein the flexible deformable portion 16 is at least partially deformed, and the flexible deformable portion 16 is located between the first sealed cavity 13 and the second sealed cavity 14 . When the vibrating diaphragm vibrates, the internal sound pressure of the first airtight cavity 13 changes, and the flexible deformable portion 16 on the first housing 11 deforms as the sound pressure in the first airtight cavity 13 changes, so that the first airtight cavity 13 13 is a flexible cavity, the volume of which is variable.

Optionally, as shown in FIG. 3, the first housing 11 includes an upper housing 112 and a lower housing 111, the mounting hole 113 is located in the upper housing 112, and the upper housing 112, the lower housing 111 and the sound unit 10 are enclosed to form a first sealed cavity 13.

In the present invention, as shown in FIG. 4, the first airtight cavity 13 is provided with an air-permeable isolation component, and the first airtight cavity 13 is filled with a sound-absorbing material 17, and the air-permeable isolation component is used to isolate the sound-absorbing material 17 from the flexible deformable part 16. In the sound generating unit 10, the air-permeable isolation assembly includes at least one insertable air-permeable spacer 18, the inner wall of the first housing 11 is provided with a slot, and the inserted air-permeable spacer 18 is inserted into the slot. In this way, the space for filling the sound-absorbing material 17 is relatively large, the equivalent volume of the closed cavity is enlarged, the sound smoothing effect is improved, and the low-frequency sound effect is improved.

Optionally, the sound-absorbing material 17 may be sound-absorbing particles formed by an adhesive.

The inserted air-permeable spacer 18 includes a soft air-permeable spacer such as a mesh cloth or a breathable film, and a hard frame fixed to the edge of the soft air-permeable spacer, and the hard frame is inserted into the slot; or, the air-permeable spacer 18 is inserted It is a hard material such as a metal mesh, which can be directly inserted into the slot.

The width of the slot in the thickness direction of the inserted air-permeable spacer 18 is not less than the thickness of the edge of the inserted air-permeable spacer 18, and when the above-mentioned width of the slot is equal to the thickness of the edge of the inserted air-permeable spacer 18, the inserted air-permeable spacer 18 is inserted After being installed in the slot, no other processes are required. At this time, the structural stability of the inserting ventilating spacer 18 and the slot is sufficiently high; when the above-mentioned width of the slot is greater than the thickness of the edge of the inserting ventilating spacer 18, inserting the ventilating spacer 18 is easier to insert into the slot, the inserting ventilating spacer 18 and the slot are not tightly combined, if relative displacement occurs, the inserting ventilating spacer 18 and the slot can be glued together to ensure structural stability .

In one embodiment, as shown in FIG. 2, the breathable isolation assembly includes only one inserted breathable separator 18. The sound generating unit 10 and the flexible deformable portion 16 are both located on the same side of the inserted breathable separator 18. On the other side of the breathable spacer 18, the space enclosed by the inserted breathable spacer 18 and the first housing 11 is filled with a sound-absorbing material 17. In this way, only one plug-in ventilating spacer 18 is needed to isolate the sound absorbing material 17 from the sound unit 10 and the flexible deformable part 16, the assembly process is simple, and the material cost is low.

In another embodiment, the air-permeable isolation assembly includes two inserted air-permeable spacers 18, and the two inserted air-permeable spacers 18 are enclosed with the first housing 11 to form a space for filling the sound-absorbing material 17. In this way, the sounding unit 10 and the flexible deforming part 16 can be respectively located on both sides of the ventilating isolation component, and it is not necessarily limited to both the sounding unit 10 and the flexible deforming part 16 are located on the same side of the ventilating isolation component, and the acoustic device product design is diversified.

Specifically, the plane where the breathable spacer 18 is inserted is parallel to the vibration direction of the flexible deformable portion 16, that is, the plane where the breathable spacer 18 is inserted is parallel to the direction of the thickness of the acoustic device. At this time, the area of the breathable spacer 18 inserted is relatively large. Small, it is more suitable to use cartridges.

In yet another embodiment, as shown in Figures 1, 3 and 4, the breathable isolation assembly further includes a breathable isolator 15. The edge of the breathable isolator 15 and the first housing can be combined by gluing, injection molding or hot melt. As one. Further, the first shell 11 is provided with hot melt ribs, and the air-permeable spacer 15 is fixed to the first shell 11 by heating the hot melt ribs. At this time, the plane where the air-permeable spacer 15 is located is perpendicular to the vibration direction of the flexible deformable part 16, and the area of the air-permeable spacer 15 is relatively large, which is beneficial for realizing thermal melting.

Specifically, the air-permeable spacer 15 may be a set of isolation components, including a frame injection molded on the first housing 11, and the above-mentioned air-permeable mesh cloth is combined on the frame by adhesive glue or integral injection molding. Furthermore, the at least one air-permeable partition 15 may be a rigid partition, and a plurality of air-permeable holes may be opened on the partition. It is understandable that in order to prevent the sound-absorbing material 17 from contacting the flexible deformable portion 16, the partition is air-permeable The hole diameter is smaller than the minimum particle size of the sound absorbing material 17.

The above-mentioned air-permeable spacer 15 can be made of metal mesh, which can enhance the strength and durability of the air-permeable spacer 15, or can be a mesh cloth or a breathable film. The material of the air-permeable spacer 15 is not limited in the present invention.

In the present invention, further, as shown in FIGS. 1 and 4, the first housing 11 corresponding to the flexible deformable portion 16 is recessed in the direction of the first sealed cavity 13 to form a mounting groove, and the first housing 11, the flexible deformable portion 16 and The sounding unit 10 encloses a first sealed cavity 13, the first housing 11 corresponding to the flexible deformable portion 16 is recessed toward the first sealed cavity 13 to form a mounting groove, and the bottom of the mounting groove is provided with a flexible deformed portion 16. In this way, the flexible deformable portion 16 is disposed in the installation groove, so as to reduce the probability of the flexible deformable portion 16 contacting other components, so as not to damage the flexible deformable portion 16.

The above-mentioned gluing method, injection molding method and hot-melting method can all make the air-permeable spacer 15 and the first housing 11 be combined together well, so that the air-permeable spacer 15 is not easy to loosen or fall off. Especially when the sound-absorbing material 17 is filled, the air-permeable spacer 15 is firmly fixed, which facilitates the filling of the sound-absorbing material 17.

The sound-absorbing material 17 can be made of activated carbon, zeolite, silica (SiO2), alumina (Al2O3), zirconia (ZrO2), magnesium oxide (MgO), ferroferric oxide (Fe3O4), molecular sieve, spherical shell carbon molecules and Any one or more of carbon nanotubes and sound-absorbing cotton.

Specifically, as shown in FIG. 1, the volume of the second sealed cavity 14 in the present invention is greater than the volume of the first sealed cavity 13.

When the vibrating diaphragm vibrates, the internal sound pressure of the first airtight cavity 13 changes, and the flexible deformable portion 16 deforms as the sound pressure changes in the first airtight cavity 13, and the volume of the first airtight cavity 13 is measured. Flexible adjustment; the second airtight cavity 14 seals the sound waves generated by the flexible deformable portion 16 during deformation in the second airtight cavity 14.

In the present invention, as shown in FIG. 1, at least a part of the housing of the electronic device used for installing the acoustic device is used to form the first airtight cavity 13 and/or the second airtight cavity 14. Among them, the electronic device may be a mobile phone, a tablet computer, a notebook computer, and the like. That is, part or all of the first housing 11 is composed of the housing of the electronic device, or part or all of the second housing 12 is composed of the housing of the electronic device, or the first housing 11 and the second housing 12 Part or all of it is constituted by the housing of the electronic device. The housing of the electronic device doubles as the first housing 11 and/or the second housing 12, which can make full use of the space inside the electronic device, while saving a part of the space occupied by the first housing 11 and/or the second housing 12, and more Conducive to the thin design of electronic equipment.

Furthermore, the part of the outer shell is used to form the second shell 12, that is, the part of the outer shell and the first shell 11 are enclosed to form the second sealed cavity 14, and the product assembly is simpler.

In one embodiment, the sounding unit 10 is installed on the first housing 11 to form a sounding assembly, and the first sealed cavity 13 is formed between the vibrating diaphragm of the sounding unit 10 and the first housing 11; the sounding assembly is installed on the second housing In the body 12, a second sealed cavity 14 is formed between the second shell 12 and the first shell 11; a flexible deformable portion 16 is provided on the first shell 11. Wherein, when there are other components in the second housing 12, the second sealed cavity 14 is actually constituted by the gap between the components and the second housing 12 and the first housing 11.

In this embodiment, the sound generating unit 10 is arranged inside the first housing 11, and the two form an integral structure, and then are assembled with the second housing 12. The first housing 11 is provided with an opening, and the front side space of the diaphragm is in communication with the opening, and the sound is radiated to the sound outlet of the acoustic device through the opening.

Further, the acoustic device is installed in a mobile phone electronic device, and the housing of the electronic device doubles as the second housing 12 of the acoustic device. The space between the housing and internal components of the electronic device and the first housing 11 of the acoustic device forms a second closed cavity 14. The second housing 12 of the acoustic device itself is omitted, making full use of the components of the housing of the electronic device. The gap space between the two can realize the maximized design of the second closed cavity 14.

In the working state of the acoustic device, when the vibrating diaphragm vibrates downward to compress the volume on the back side of the vibrating diaphragm, the sound pressure will be transmitted to the flexible deformation part 16 through the first closed cavity 13, and the flexible deformation part 16 will face the first closed cavity 13 expands and deforms outside; on the contrary, when the vibrating diaphragm vibrates upward, the flexible deformable portion 16 will contract and deform inward, thereby adjusting the volume of the first sealed cavity 13. Wherein, the body of the flexible deformation part 16 can be made of plastic material or thermoplastic elastomer material, or silicone rubber material, and can be a one-layer or multi-layer composite structure, and the body of the flexible deformation part 16 can be a flat plate. Or a partially convex or concave structure, such as a central convex, an edge convex, or a combination of a central convex and an edge convex. Specifically, at least one of TPU, TPEE, LCP, PAR, PC, PA, PPA, PEEK, PEI, PEN, PES, PET, PI, PPS, PPSU, and PSU is used for all or a partial area of the flexible deformable portion 16 . In addition, the thickness of the flexible deformable portion 16 is less than or equal to 0.5 mm. If the thickness is too thick, the strength of the flexible deformable portion will increase and the compliance will decrease, which is not conducive to deformation.

Further, in order to improve the vibration effect, a composite sheet can be superimposed on the middle part of the main body of the flexible deformable part 16. The strength of the composite sheet is higher than the strength of the main body, and it can be metal, plastic, carbon fiber, or a composite structure thereof, etc. . In addition, the main body of the flexible deformable portion 16 can be a sheet-like overall structure, or it can be a hollowed-out structure with a composite sheet in the middle. In the case that the hollowed-out structure of the main body of the flexible deformable portion 16 only retains the edge, the edge can be flat or flat. A convex shape to one side, or a wavy shape.

Preferably, the flexible deformable portion 16 is integrally combined with other parts of the first housing 11. As a specific solution, the flexible deformable portion 16 can be manufactured first, and then the flexible deformable portion 16 is integrally injection molded as an insert into the other parts.

In the present invention, the main bodies of the first sealed cavity 13 and the second sealed cavity 14 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 conducive to the thin design of the product .

In the acoustic device, the airtight cavity on the back side of the vibrating diaphragm is divided into a first airtight cavity 13 and a second airtight cavity 14 by the first housing 11, and the first housing 11 is provided with a flexible deforming part 16, which is provided with a flexible deformation Part 16, the flexible deforming part 16 deforms with the sound pressure, the volume of the first sealed cavity 13 is adjustable, thereby increasing the equivalent acoustic compliance of the first sealed cavity 13, effectively reducing the resonance frequency of the acoustic device, and improving low-frequency sensitivity; Two airtight cavities 14 are used to isolate the sound radiation generated during the deformation of the flexible deformable part 16, and the radiated sound waves of the flexible deformable part 16 are enclosed inside the acoustic device to avoid the phased radiated sound waves of the flexible deformable part 16 and the positive direction of the sound generating unit 10. The radiated sound waves cause offsetting effects, thereby greatly improving the low-frequency sensitivity of the product as a whole.

Moreover, the volume of the second sealed cavity 14 is greater than the volume of the first sealed cavity 13, which can make the deformation of the flexible deformable part 16 easier, which is more conducive to increasing the equivalent acoustic compliance of the first sealed cavity 13 and effectively reducing the resonance frequency of the acoustic device. Improve low frequency sensitivity.

In addition, the present invention also discloses an electronic device. An acoustic device is installed on the electronic device. The electronic device may be a mobile phone, a tablet computer, a notebook, or the like.

The electronic device includes a housing. As shown in FIG. 1, at least a part of the housing of the electronic device is used to form a first sealed cavity 13 and/or a second sealed cavity 14. That is, part or all of the first housing 11 is composed of the housing of the electronic device, or part or all of the second housing 12 is composed of the housing of the electronic device, or the first housing 11 and the second housing 12 Part or all of it is constituted by the housing of the electronic device. In the present invention, the housing of the electronic device doubles as the first housing 11 and/or the second housing 12, so that the space inside the electronic device can be used from time to time, while saving a part of the first housing 11 and/or the second housing 12 The occupied space is more conducive to the thin design of electronic equipment.

Specifically, the acoustic device includes a first housing 11, a sound generating unit 10 is mounted on the first housing 11 to form a sound generating assembly, and a first airtight cavity 13 is formed between the vibrating diaphragm of the sound generating unit 10 and the first housing 11, wherein , The first housing 11 is provided with a flexible deformable portion 16; the acoustic device further includes a second housing 12, the sound generating component is installed in the second housing 12, and the second housing 12 and the first housing 11 form a second housing. Two airtight cavity 14. Among them, the second housing 12 is a housing of an electronic device. In fact, the space between the housing of the electronic equipment and the internal components and the first housing 11 of the acoustic device forms a second closed cavity 14. The housing of the electronic equipment doubles as the second housing 12 of the acoustic device, and the acoustic device is omitted. The second housing 12 of its own makes full use of the gap space between the housing components of the electronic device, and can realize the maximum design of the second sealed cavity 14, which is conducive to the thin design of the electronic device.

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

The first housing, the first housing and the vibrating diaphragm are enclosed to form a first closed cavity, the first housing is provided with a mounting hole, and the mounting hole is provided with a cover covering the mounting hole The flexible deformable part is provided with a second hermetic cavity outside the first hermetic cavity, the flexible deformable part is located between the first hermetic cavity and the second hermetic cavity, and the second hermetic cavity The sound waves generated by the flexible deformable portion during deformation are enclosed in the second sealed cavity;

The first airtight cavity is provided with an air-permeable isolation component, the first airtight cavity is filled with a sound-absorbing material, and the air-permeable isolation component is used to isolate the sound-absorbing material from the flexible deformable part and the sound unit, so The air-permeable isolation assembly includes at least one inserted air-permeable spacer, an inner wall of the first housing is provided with a slot, and the inserted air-permeable spacer is inserted into the slot.
The acoustic device according to claim 1, wherein the sound generating unit and the flexible deformable portion are located on the same side of the inserting breathable spacer, and the other side of the inserting breathable spacer, the The sound-absorbing material is filled in the space enclosed by the inserted air-permeable spacer and the first housing.
The acoustic device according to claim 1, wherein the air-permeable isolation component comprises two insertable air-permeable spacers, and the two insertable air-permeable spacers are enclosed with the first housing to be filled The space for the sound-absorbing material.
The acoustic device according to claim 2 or 3, wherein the plane on which the inserted air-permeable isolator is located is parallel to the vibration direction of the flexible deformable part.
The acoustic device according to claim 1, wherein the air-permeable isolation component further comprises an air-permeable isolator, and the edge of the air-permeable isolator and the first housing are combined by gluing, injection molding, or hot melt. One.
The acoustic device according to claim 5, wherein the plane where the air-permeable isolator is located is perpendicular to the vibration direction of the flexible deformable part.
The acoustic device according to claim 1, wherein the edge thickness of the inserted air-permeable spacer is equal to the width of the slot in the thickness direction of the inserted air-permeable spacer.
The acoustic device according to claim 5, wherein the air-permeable isolator and/or the insert air-permeable isolator comprises a mesh cloth, a metal mesh, or an air-permeable membrane.
An electronic device, characterized in that the electronic device comprises a housing and the acoustic device according to any one of claims 1-8, and at least a part of the housing is used to form the first airtight cavity and/or the acoustic device. The second airtight cavity.
9. The electronic device according to claim 9, wherein a part of the housing and the first housing encloses to form the second airtight cavity.