CN110830894A

CN110830894A - Acoustic device and electronic apparatus

Info

Publication number: CN110830894A
Application number: CN201911091086.2A
Authority: CN
Inventors: 郝正恩; 张军
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2019-11-09
Filing date: 2019-11-09
Publication date: 2020-02-21
Also published as: WO2021088212A1

Abstract

The invention discloses an acoustic device, which comprises a sound production unit and a first shell, wherein the sound production unit comprises a vibrating diaphragm, the first shell and the vibrating diaphragm are enclosed to form a first closed cavity, a mounting hole is formed in the first shell, a flexible deformation part for covering the mounting hole is arranged at the mounting hole, a second closed cavity is arranged outside the first closed cavity, the flexible deformation part is positioned between the first closed cavity and the second closed cavity, a ventilation isolation component is arranged in the first closed cavity, a sound absorbing material is filled in the first closed cavity, the ventilation isolation component is used for isolating the sound absorbing material from the flexible deformation part, and the sound production unit. The invention also discloses electronic equipment which comprises a shell and the acoustic device. The acoustic device of the present invention is excellent in acoustic performance.

Description

Acoustic device and electronic apparatus

Technical Field

The present invention relates to the field of acoustic technologies, and in particular, to an acoustic device and an electronic apparatus having the acoustic device.

Background

In general, an acoustic system of a conventional structure includes a closed casing and a sound generating unit provided on the closed casing, a chamber is formed between the closed casing and the sound generating unit, and it is difficult for the acoustic system, particularly a small acoustic system, to achieve an effect of satisfactorily reproducing bass sound due to a volume limit of the chamber in the acoustic system. Conventionally, in order to achieve satisfactory bass reproduction in an acoustic system, two approaches are generally adopted, one is to arrange a sound absorbing material (such as activated carbon, zeolite, etc.) in a box of the acoustic system for adsorbing or desorbing gas in the box, so as to achieve an effect of increasing a volume and further reducing a low-frequency resonance frequency, and the other is to arrange a passive radiator on the box of the acoustic system, wherein a sound emitting unit and the passive radiator simultaneously radiate sound to the outside, and the sound waves of the sound emitting unit and the passive radiator are communicated and superposed by utilizing a principle that the passive radiator and the box form strong resonance at a specific frequency point fp (resonance frequency point), so as to enhance local sensitivity near the resonance frequency point fp (for example, see patent CN 1939086A).

However, the two measures have problems, and the first method has poor improvement effect on the sensitivity of the low-frequency band by filling the sound-absorbing material only when the size and the volume of the cavity are limited; the second scheme adopts a passive radiator, the passive radiator strongly radiates near a resonance frequency point fp, and a sound generating unit is almost stopped, so that the local sensitivity of the acoustic system can be enhanced at a frequency band near fp through the high-sensitivity design of the passive radiator; however, in the frequency band below fp, the sound waves of the passive radiator and the sound generating unit are opposite in phase, the sound waves are mutually counteracted, and the passive radiator plays a negative role in the sensitivity of an acoustic system. In summary, the passive radiator can only improve the sensitivity of the frequency band near the resonance point, but cannot improve the sensitivity of all the low frequency bands, so it is necessary to further improve the defects of the prior art.

Disclosure of Invention

The invention aims to provide a novel cavity structure, and meanwhile, a sound-absorbing material is placed in a closed cavity, so that the equivalent volume of a rear cavity can be increased, the resonance frequency can be reduced, and the low-frequency sound effect can be improved.

To achieve the above and other objects, the present invention provides an acoustic device including:

the sound production unit comprises a vibrating diaphragm, a sound outlet is formed in the acoustic device, and sound waves on the front side of the vibrating diaphragm radiate outwards through the sound outlet;

the vibration diaphragm is enclosed to form a first closed cavity, a mounting hole is formed in the first shell, a flexible deformation part covering the mounting hole is arranged at the mounting hole, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible deformation part is located between the first closed cavity and the second closed cavity, and sound waves generated by the flexible deformation part during deformation are sealed in the second closed cavity by the second closed cavity;

first airtight intracavity is equipped with ventilative isolation assembly, it has sound absorbing material to fill in the first airtight chamber, ventilative isolation assembly is used for keeping apart sound absorbing material with flexible deformation portion the sound production unit, ventilative isolation assembly includes the ventilative separator of a cartridge at least, be equipped with the slot on the inner wall of first casing, the ventilative separator cartridge of cartridge in the slot.

Optionally, the sound generating unit and the flexible deformation portion are located on the same side of the air-permeable plug-in mounting partition, the other side of the air-permeable plug-in mounting partition, and the space formed by the air-permeable plug-in mounting partition and the first shell in a surrounding mode is filled with the sound absorbing material.

Optionally, the air-permeable isolation assembly comprises two inserted air-permeable isolators, and the two inserted air-permeable isolators and the first shell enclose a space for filling the sound-absorbing material.

Optionally, the plane where the air-permeable inserted spacer is located is parallel to the vibration direction of the flexible deformation part.

Optionally, the breathable isolation assembly further comprises a breathable isolation piece, and the edge of the breathable isolation piece and the first shell are integrated in an adhesive, injection molding or hot melting mode.

Optionally, the plane of the breathable partition is perpendicular to the vibration direction of the flexible deformation part.

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

Optionally, the gas permeable barrier and/or the inserted gas permeable barrier comprises a mesh, a metal mesh or a gas permeable membrane.

In order to achieve the above and other objects, the present invention provides an electronic apparatus including an enclosure and the above acoustic device, at least a portion of the enclosure forming the first enclosed cavity and/or the second enclosed cavity.

Optionally, a portion of the outer shell and the first shell enclose the second closed cavity.

The invention has the technical effects that at least, in the acoustic device, the first shell and the vibrating diaphragm are enclosed to form a first closed cavity, the first shell is provided with a mounting hole, the mounting hole is provided with a flexible deformation part, by arranging the flexible deformation part, the flexible deformation part deforms along with the sound, so that the volume of the first closed cavity is adjustable, thereby increasing the equivalent acoustic compliance of the first closed cavity, effectively reducing the resonance frequency of the acoustic device, improving the low-frequency sensitivity, and, be equipped with ventilative isolation assembly in the first airtight chamber, it has sound absorbing material to fill in the first airtight chamber, ventilative isolation assembly is used for keeping apart sound absorbing material and flexible deformation portion, sound production unit, and ventilative isolation assembly includes the ventilative isolator of an cartridge at least, is equipped with the slot on the inner wall of first casing, and the ventilative isolator cartridge of cartridge promotes acoustic device's acoustic performance in the slot.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

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

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

FIG. 3 is an exploded view of a third embodiment of the acoustic apparatus of the present invention;

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

The reference numbers illustrate:

10 is the sound production monomer, 11 is first casing, 111 is the inferior valve, 112 is the epitheca, 113 is the mounting hole, 12 is the second casing, 13 is first airtight chamber, 14 is the second airtight chamber, 15 is ventilative separator, 16 is flexible deformation portion, 17 is sound absorbing material, 18 is the ventilative separator of cartridge.

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: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The invention provides an acoustic device which is used for sounding 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, and more specifically, the sound emitting unit 10 is a miniature moving coil speaker. The sound generating unit 10 generally includes a housing, and a vibration system and a magnetic circuit system accommodated and fixed in the housing, the vibration system includes a diaphragm fixed on the housing and a voice coil combined on the diaphragm, the magnetic circuit system is formed with a magnetic gap, the voice coil is disposed in the magnetic gap, and the voice coil reciprocates up and down in a magnetic field after being supplied with alternating current, so as to drive the diaphragm to generate sound.

A sound outlet (not shown) is provided in the acoustic device, through which sound waves on the front side of the diaphragm are radiated to the outside, and sound waves on the rear side of the diaphragm are left inside the acoustic device. A cavity is formed between the vibrating diaphragm, the sound generating unit 10 casing and the magnetic circuit system. Preferably, the vibration direction of the vibration diaphragm of the sound emitting unit 10 is parallel to the thickness direction of the acoustic device, which facilitates the slim 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 diaphragm enclose a first sealed cavity 13, and a second sealed cavity 14 is disposed outside the first sealed cavity 13. The second closed cavity 14 is formed by enclosing the second shell 12 and the first shell 11, the first closed cavity 13 is adjacent to the vibrating diaphragm, and the second closed cavity 14 is far away from the vibrating diaphragm. In order to solve the problems that the sensitivity effect of improving the low frequency band by adopting a single sound-absorbing material 17 is poor and the frequency band which can be improved by adopting a single passive radiator structure is limited in the prior art, in the invention, a mounting hole 113 is formed on the first shell 11, a flexible deformation part 16 which covers the mounting hole 113 is arranged at the mounting hole 113, wherein at least part of the flexible deformation part 16 is flexibly deformed, and the flexible deformation part 16 is positioned between the first closed cavity 13 and the second closed cavity 14. When the vibrating diaphragm vibrates, the sound pressure inside the first sealed cavity 13 changes, and the flexible deformation part 16 on the first shell 11 deforms along with the change of the sound pressure inside the first sealed cavity 13, so that the first sealed cavity 13 is a flexible cavity and the volume of the first sealed cavity is variable.

Alternatively, as shown in fig. 3, the first housing 11 includes an upper shell 112 and a lower shell 111, the mounting hole 113 is located in the upper shell 112, and the upper shell 112, the lower shell 111 and the sound generating unit 10 enclose to form a first closed cavity 13.

In the present invention, as shown in fig. 4, a ventilation isolation assembly is disposed in the first sealed cavity 13, the sound absorbing material 17 is filled in the first sealed cavity 13, the ventilation isolation assembly is used to isolate the sound absorbing material 17 from the flexible deformation portion 16 and the sound generating unit 10, the ventilation isolation assembly at least includes a plug-in ventilation isolation member 18, a slot is disposed on an inner wall of the first housing 11, and the plug-in ventilation isolation member 18 is inserted into the slot. So, it is great to fill sound absorbing material 17's space, enlarges the equivalent volume in airtight chamber, promotes the sound effect of following, promotes the low frequency audio.

Alternatively, the sound-absorbing material 17 may be sound-absorbing particles made of a binder.

The inserted breathable isolating piece 18 comprises a mesh cloth, a breathable film and other soft breathable isolating pieces and a hard frame fixed at the edge of the soft breathable isolating piece, and the hard frame is inserted into the slot; alternatively, the inserted air-permeable partition 18 is made of a hard material such as metal mesh, and the hard material can be directly inserted into the insertion groove.

The width of the slot in the thickness direction of the inserted breathable isolating piece 18 is not less than the thickness of the edge of the inserted breathable isolating piece 18, when the width of the slot is equal to the thickness of the edge of the inserted breathable isolating piece 18, after the inserted breathable isolating piece 18 is inserted into the slot, other procedures are not needed, and at the moment, the structural stability of the inserted breathable isolating piece 18 and the slot is high enough; when the width of the slot is larger than the thickness of the edge of the air-permeable inserted spacer 18, the air-permeable inserted spacer 18 is more easily inserted into the slot, the air-permeable inserted spacer 18 and the slot are not tightly combined, and if relative displacement occurs, the air-permeable inserted spacer 18 and the slot can be combined together in an adhesive mode to ensure structural stability.

In one embodiment, as shown in fig. 2, the air-permeable isolating assembly includes only one inserted air-permeable isolating member 18, the sound generating unit 10 and the flexible deformation portion 16 are both located on the same side of the inserted air-permeable isolating member 18, and the space enclosed by the inserted air-permeable isolating member 18 and the first housing 11 is filled with a sound absorbing material 17. Therefore, the sound-absorbing material 17 can be isolated from the sound-producing unit 10 and the flexible deformation part 16 only by arranging the air-permeable plug-in spacer 18, the assembly process is simple, and the material cost is low.

In another embodiment, the air-permeable barrier assembly comprises two inserted air-permeable barriers 18, the two inserted air-permeable barriers 18 enclosing a space with the first casing 11 for filling the sound-absorbing material 17. Thus, the sound generating unit 10 and the flexible deformation portion 16 can be respectively located at two sides of the breathable isolation assembly, and are not limited to the situation that the sound generating unit 10 and the flexible deformation portion 16 are located at the same side of the breathable isolation assembly, and the design of the acoustic device is diversified.

Specifically, the plane in which the air-permeable partition 18 is inserted is parallel to the vibration direction of the flexible deformation portion 16, that is, the plane in which the air-permeable partition 18 is inserted is parallel to the thickness direction of the acoustic device, and at this time, the area of the air-permeable partition 18 is small, and the insertion is more suitable.

In still another embodiment, as shown in fig. 1, 3 and 4, the air-permeable barrier assembly further comprises an air-permeable barrier 15, and the edge of the air-permeable barrier 15 and the first housing may be integrated by gluing, injection molding or hot melting. Further, a hot-melting rib is arranged on the first shell 11, and the air-permeable partition 15 is fixed with the first shell 11 by heating the hot-melting rib. At this time, the plane of the air-permeable partition 15 is perpendicular to the vibration direction of the flexible deformation portion 16, and the area of the air-permeable partition 15 is large, which is beneficial to realizing hot melting.

In particular, the breathable barrier means 15 may be a set of barrier components comprising a frame moulded onto the first casing 11, on which the above-mentioned breathable mesh is incorporated, by means of adhesive glue or by means of integral moulding. Further, at least one of the ventilation spacers 15 may be a hard partition plate, and a plurality of ventilation holes may be formed in the partition plate, and it is understood that the hole diameter of the ventilation holes in the partition plate is smaller than the minimum particle diameter of the sound-absorbing material 17 in order to prevent the sound-absorbing material 17 from contacting the flexible deformation portion 16.

The breathable isolation member 15 may be a metal mesh, which can enhance the strength and durability of the breathable isolation member 15, or a mesh or a breathable film, and the material of the breathable isolation member 15 is not limited in the present invention.

In the present invention, as shown in fig. 1 and 4, a position of the first housing 11 corresponding to the flexible deformation portion 16 is recessed toward the first sealed cavity 13 to form an installation groove, the first housing 11, the flexible deformation portion 16 and the sound generating unit 10 are enclosed to form the first sealed cavity 13, a position of the first housing 11 corresponding to the flexible deformation portion 16 is recessed toward the first sealed cavity 13 to form an installation groove, and the flexible deformation portion 16 is disposed at the groove bottom of the installation groove. Therefore, the flexible deformation part 16 is arranged in the mounting groove, so that the probability of contact between the flexible deformation part 16 and other parts is reduced, and the flexible deformation part 16 is prevented from being damaged.

The gluing mode, the injection molding mode and the hot melting mode can well combine the breathable isolation piece 15 and the first shell 11 together, so that the breathable isolation piece 15 is not easy to loosen and fall off. Particularly, when the sound absorbing material 17 is filled, the air-permeable partition 15 is firmly fixed, which facilitates filling of the sound absorbing material 17.

The sound absorbing material 17 may be made of any one or more of activated carbon, zeolite, silica (SiO2), alumina (Al2O3), zirconia (ZrO2), magnesia (MgO), triiron tetroxide (Fe3O4), molecular sieves, fullerene-like carbon molecules, carbon nanotubes, and sound absorbing cotton.

Specifically, as shown in fig. 1, the volume of the second closed chamber 14 is larger than the volume of the first closed chamber 13 in the present invention.

When the vibrating diaphragm vibrates, the sound pressure inside the first closed cavity 13 changes, the flexible deformation part 16 deforms along with the change of the sound pressure inside the first closed cavity 13, and the flexible adjustment of the volume of the first closed cavity 13 is performed; the second closed cavity 14 encloses the sound wave generated by the flexible deformation part 16 during deformation in the second closed cavity 14.

In the present invention, as shown in fig. 1, at least a part of the housing of the electronic apparatus for mounting the acoustic device is used to form the first closed chamber 13 and/or the second closed chamber 14. The electronic device can be a mobile phone, a tablet computer, a notebook computer and the like. That is, a part or the whole of the first casing 11 is formed by a housing of the electronic device, a part or the whole of the second casing 12 is formed by a housing of the electronic device, or a part or the whole of the first casing 11 and the second casing 12 is formed by a housing of the electronic device. The shell of the electronic device is used as the first shell 11 and/or the second shell 12, so that the space inside the electronic device can be fully utilized, and meanwhile, the space occupied by a part of the first shell 11 and/or the second shell 12 is saved, which is more beneficial to the thin design of the electronic device.

Further, the part of the outer shell is used for forming the second shell 12, namely the part of the outer shell and the first shell 11 enclose to form the second closed cavity 14, and the product assembly is simpler.

In one embodiment, the sound generating unit 10 is mounted on the first housing 11 to form a sound generating assembly, and a first sealed cavity 13 is formed between the vibrating diaphragm of the sound generating unit 10 and the first housing 11; the sounding component is arranged in the second shell 12, and a second closed cavity 14 is formed between the second shell 12 and the first shell 11; the first housing 11 is provided with a flexible deformation portion 16. In the case where other components are present in the second casing 12, the second sealed chamber 14 is actually formed by the components and the gap between the second casing 12 and the first casing 11.

In this embodiment, the sound generating unit 10 is disposed inside the first housing 11, and both are formed as an integral structure, and then assembled with the second housing 12. The first housing 11 is provided with an opening with which the diaphragm front side space communicates, through which sound is radiated to the sound outlet of the acoustic device.

Further, the acoustic device is installed in the electronic equipment of the mobile phone, and the housing of the electronic equipment doubles as the second casing 12 of the acoustic device. The space between the outer shell of the electronic equipment and the internal parts and the space between the outer shell of the electronic equipment and the first shell 11 of the acoustic device form a second closed cavity 14, the second shell 12 of the acoustic device is omitted, the gap space between the outer shell parts of the electronic equipment is fully utilized, and the maximum design of the second closed cavity 14 can be realized.

When the acoustic device is in a working state, when the vibrating diaphragm vibrates downwards to compress the volume at the rear side of the vibrating diaphragm, sound pressure is transmitted to the flexible deformation part 16 through the first closed cavity 13, and the flexible deformation part 16 expands and deforms towards the outer side of the first closed cavity 13; on the contrary, when the diaphragm vibrates upwards, the flexible deformation portion 16 contracts and deforms inwards, so as to adjust the volume of the first closed cavity 13. The flexible deformation portion 16 may be made of plastic or thermoplastic elastomer, or may be made of silicone rubber, or may be a single layer or a multi-layer composite structure, and the flexible deformation portion 16 may have a flat body, or a structure with a portion of protrusion or recess, such as a structure with a protrusion at the central portion and a protrusion at the edge portion, or a structure with a protrusion at the central portion and a protrusion at the edge portion combined together. Specifically, all or part of the flexible deformation part 16 is at least one of TPU, TPEE, LCP, PAR, PC, PA, PPA, PEEK, PEI, PEN, PES, PET, PI, PPS, PPSU, and PSU. And the thickness of the flexible deformation part 16 is less than or equal to 0.5mm, and the thickness is too thick, so that the strength of the flexible deformation part is increased, the compliance is reduced, and the deformation is not facilitated.

Further, in order to improve the vibration effect, a composite sheet can be superimposed on the middle part of the body of the flexible deformation part 16, the strength of the composite sheet is higher than that of the body, and the composite sheet can be metal, plastic, carbon fiber or a composite structure thereof and the like. In addition, the body of the flexible deformation part 16 may be a sheet-shaped integral structure, or a structure with a hollowed middle part and a composite sheet, and when the hollowed middle part of the body of the flexible deformation part 16 only retains an edge part, the edge part may be flat, or convex toward one side, or wavy.

Preferably, the flexible deformation portion 16 is integrally combined with other portions of the first housing 11, and as a specific scheme, the flexible deformation portion 16 may be manufactured first, and then the flexible deformation portion 16 is integrally injection-molded in the other portions as an insert.

In the present invention, the main bodies of the first and second

closed chambers

13 and 14 extend in a horizontal direction formed by the length and width of the acoustic device, and the horizontal direction may be defined as 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 the horizontal plane, and the two chambers are arranged along the horizontal direction, so that the space in the height direction of the acoustic device is not occupied as much as possible, and the thinning design of a product is facilitated.

In the acoustic device, a closed cavity at the rear side of a vibrating diaphragm is divided into a first closed cavity 13 and a second closed cavity 14 through a first shell 11, a flexible deformation part 16 is arranged on the first shell 11, the flexible deformation part 16 deforms along with sound pressure through arrangement of the flexible deformation part 16, and the volume of the first closed cavity 13 is adjustable, so that the equivalent acoustic compliance of the first closed cavity 13 is increased, the resonance frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved; the sound radiation that produces in the 16 deformation processes of isolated flexible deformation portion through second airtight chamber 14, seals the radiation sound wave of flexible deformation portion 16 inside acoustic device, avoids the sending out phase place radiation sound wave of flexible deformation portion 16, causes the offset influence to the forward radiation sound wave of sound generating unit 10, and then the low band sensitivity of product is promoted to great amplitude on the whole.

And, the volume of second airtight chamber 14 is greater than the volume of first airtight chamber 13, can make the deformation of flexible deformation portion 16 easier, is favorable to increasing first airtight chamber 13 equivalent acoustic compliance more, effectively reduces acoustic device resonant frequency, promotes low frequency sensitivity.

In addition, the invention also discloses electronic equipment, wherein the acoustic device is arranged on the electronic equipment, and the electronic equipment can be a mobile phone, a tablet computer, a notebook computer and the like.

The electronic device comprises an outer envelope, at least a part of which is used to form a first closed cavity 13 and/or a second closed cavity 14, as shown in fig. 1. That is, a part or the whole of the first casing 11 is formed by a housing of an electronic device, a part or the whole of the second casing 12 is formed by a housing of an electronic device, or a part or the whole of the first casing 11 and the second casing 12 is formed by a housing of an electronic device. In the invention, the shell of the electronic device is used as the first shell 11 and/or the second shell 12, so that the space in the electronic device can be utilized, and meanwhile, the space occupied by a part of the first shell 11 and/or the second shell 12 is saved, which is more beneficial to the thin design of the electronic device.

Specifically, the acoustic device includes a first casing 11, a sound generating unit 10 is mounted on the first casing 11 to form a sound generating assembly, a first sealed cavity 13 is formed between a diaphragm of the sound generating unit 10 and the first casing 11, wherein a flexible deformation portion 16 is arranged on the first casing 11; the acoustic device further comprises a second housing 12, the sound generating assembly being mounted in the second housing 12, a second closed chamber 14 being formed between the second housing 12 and the first housing 11. The second casing 12 is a housing of the electronic device. In fact, the space between the electronic equipment shell and the internal parts and the space between the electronic equipment shell and the first shell 11 of the acoustic device form a second closed cavity 14, the electronic equipment shell is also used as the second shell 12 of the acoustic device, the second shell 12 of the acoustic device is omitted, the gap space between the electronic equipment shell parts is fully utilized, the maximum design of the second closed cavity 14 can be realized, and the electronic equipment is beneficial to the thinning design.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. An acoustic device, comprising:

2. The acoustic device according to claim 1, wherein the sound generating unit and the flexible deformation portion are located on the same side of the air-permeable inserted spacer, and on the other side of the air-permeable inserted spacer, and the sound absorbing material is filled in a space enclosed by the air-permeable inserted spacer and the first housing.

3. The acoustic device of claim 1, wherein the air-permeable barrier assembly comprises two inserted air-permeable barriers that enclose a space with the first housing to fill the sound-absorbing material.

4. The acoustic device according to claim 2 or 3, wherein the plane in which the gas-permeable inserted spacer is located is parallel to the direction of vibration of the flexible deformation.

5. The acoustic device of claim 1, wherein the breathable barrier assembly further comprises a breathable barrier having an edge that is bonded to the first housing by gluing, injection molding, or heat fusing.

6. The acoustic device according to claim 5, wherein the plane of the gas-permeable barrier is perpendicular to the direction of vibration of the flexible deformation.

7. The acoustic device of claim 1, wherein the insert breathable spacer has an edge thickness equal to a width of the socket in a thickness direction of the insert breathable spacer.

8. The acoustic device of claim 5, wherein the gas permeable barrier and/or the inserted gas permeable barrier comprises a mesh, a metal mesh, or a gas permeable membrane.

9. An electronic device, characterized in that the electronic device comprises an enclosure and an acoustic device according to any of claims 1-8, at least a part of the enclosure being adapted to form the first closed cavity and/or the second closed cavity.

10. The electronic device of claim 9, wherein a portion of the housing encloses the first housing to form the second enclosed cavity.