CN210298035U

CN210298035U - Acoustic device and electronic apparatus

Info

Publication number: CN210298035U
Application number: CN201920461060.1U
Authority: CN
Inventors: 徐同雁; 郭翔; 张成飞
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2020-04-10
Anticipated expiration: 2029-04-04
Also published as: WO2020199654A1

Abstract

The utility model provides an acoustic device, which is provided with a sound outlet; the rear side of the vibrating diaphragm forms a closed cavity, the closed cavity is divided into a first closed cavity and a second closed cavity by a partition part, the partition part can be at least partially flexibly deformed, the first closed cavity is adjacent to the vibrating diaphragm, the second closed cavity is far away from the vibrating diaphragm, and the second closed cavity closes sound waves generated by the flexible deformation part during deformation in the second closed cavity; and a pressure equalizing hole for communicating the first closed cavity with the second closed cavity is formed in the flexible deformation part. Furthermore, the utility model discloses still provide an electronic equipment. The utility model provides an acoustics device can effectively reduce resonant frequency, and great amplitude promotes the low band sensitivity of product on the whole.

Description

Acoustic device and electronic apparatus

Technical Field

The utility model relates to an acoustics technical field, more specifically relates to an acoustics device and install electronic equipment of this acoustics device.

Background

In general, an acoustic system of a conventional structure (prior art 1) 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 limitation of the chamber in the acoustic system. Conventionally, in order to achieve satisfactory bass reproduction in an acoustic system, two approaches are generally taken, one being to dispose a sound absorbing material (e.g., activated carbon, zeolite, etc.) in a cabinet of the acoustic system, for adsorbing or desorbing gas in the enclosure to achieve the effect of increasing the volume and thus lowering the low frequency resonance frequency, and another is to provide a passive radiator (prior art 2) on the enclosure of the acoustic system, such as shown in figure 1, the sound system comprises a sounding unit 10, a box 20, a passive radiator 30, and a sound emitting unit and the passive radiator which radiate sound at the same time, wherein sound waves of the sounding unit and the passive radiator are communicated and superposed by using the principle that the passive radiator and the box form strong resonance at a specific frequency point fp (resonance frequency point), so that local sensitivity near the resonance frequency point fp is enhanced (for example, see patent CN 1939086A). However, the two approaches have problems, the first solution of adding sound-absorbing material in the cabinet needs to realize good sealing and packaging of the sound-absorbing material, otherwise if the sound-absorbing material enters the speaker unit, the acoustic performance of the speaker unit is damaged, and the service life of the speaker unit is affected; in the second scheme adopting the passive radiator, the passive radiator strongly radiates near a resonance frequency point fp, and the sound production 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 phases of sound waves of the passive radiator and the sound production unit are opposite, 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 increase the sensitivity of the frequency band near the resonance point, but cannot increase the sensitivity of all the low frequency bands. As shown in fig. 2, fig. 2 is a test curve (SPL curve) of loudness at different frequencies for prior art 2 and prior art 1. There is a need for further improvements to the deficiencies of the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an effectively reduce resonant frequency, the whole acoustic device of great amplitude promotion product's low band sensitivity.

In order to solve the technical problem, the utility model provides a technical scheme is: in order to achieve the above object, 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 rear side of the vibrating diaphragm forms a closed cavity, the closed cavity is divided into a first closed cavity and a second closed cavity by a partition part, wherein the partition part can be at least partially flexibly deformed, the first closed cavity is adjacent to the vibrating diaphragm, the second closed cavity is far away from the vibrating diaphragm, and the second closed cavity seals sound waves generated by the flexible deformation part during deformation in the second closed cavity;

and the flexible deformation part is provided with a pressure equalizing hole for communicating the first closed cavity with the second closed cavity.

Preferably, the number of the pressure equalizing holes is one, and the diameter of each pressure equalizing hole is 0.3-1.0 mm.

Preferably, the pressure equalizing holes are a plurality of micropores which are dispersedly arranged, and the aperture of each micropore is 0.05 mm-0.15 mm.

Preferably, the flexible deformation part is provided with a damping mesh cloth covering the pressure equalizing hole.

Preferably, the sound generating unit with first airtight chamber one-to-one is equipped with a plurality ofly, the airtight chamber of second is equipped with one, every first airtight chamber with be equipped with flexible deformation portion on the interval portion between the airtight chamber of second.

Preferably, the acoustic device includes a first casing, the sound generating unit is mounted on the first casing to form a sound generating assembly, and the first sealed cavity is formed between a vibrating diaphragm of the sound generating unit and the first casing;

the acoustic device comprises a second shell, the sound production assembly is arranged in the second shell, and a second closed cavity is formed between the second shell and the first shell;

a portion of the first housing forms the spacer;

the second shell is a shell of the electronic equipment.

Preferably, the second housing has a top wall, a bottom wall and a side wall connecting the top wall and the bottom wall, and the sound outlet is provided on the top wall, the bottom wall or the side wall.

Preferably, the acoustic device is provided with a sound outlet channel corresponding to the sound outlet, through which sound waves on the front side of the diaphragm are radiated to the sound outlet, wherein,

the sound generating unit is arranged in the first shell, and the sound generating channel is arranged on the first shell;

or the sound emitting channel is arranged on the second shell, and the sound emitting assembly is in butt joint with the sound emitting channel;

or the sound outlet channel is independently arranged and is respectively butted with the sound outlet and the sound production assembly.

Preferably, the flexible deformation part is an independent component, and the flexible deformation part is fixedly connected with other parts of the first shell in a bonding, welding or hot melting mode;

alternatively, the flexible deformation portion is integrally combined with other portions of the first housing.

In addition, in order to solve the above problems, the present invention further provides an electronic device, which includes the acoustic device as described above;

the acoustic device comprises a first shell, the sound production unit is arranged on the first shell to form a sound production assembly, and a first closed cavity is formed between a vibrating diaphragm of the sound production unit and the first shell; the acoustic device further comprises a second shell, the sound production assembly is installed in the second shell, and a second closed cavity is formed between the second shell and the first shell;

a portion of the first housing forms the spacer;

the second shell is a shell of the electronic equipment.

According to the technical scheme provided by the utility model, in the acoustic device, the airtight cavity at the rear side of the vibrating diaphragm is separated into a first airtight cavity and a second airtight cavity through the partition part, the flexible deformation part is arranged on the partition part, the flexible deformation part deforms along with the sound pressure through the flexible deformation part, and the volume of the first airtight cavity is adjustable, so that the equivalent acoustic compliance of the first airtight cavity is increased, the resonance frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved; and through the design of keeping apart sound generating unit and flexible deformation portion, seal the radiation sound wave of flexible deformation portion inside acoustic device, avoid the antiphase radiation sound wave of flexible deformation portion, cause the offset influence to the forward radiation sound wave of sound generating unit, and then the low band sensitivity of great amplitude promotion product on the whole. Further, the utility model discloses in, through set up the voltage-sharing hole in order two airtight chambeies of UNICOM in the flexible deformation portion, make first airtight chamber with atmospheric pressure between the airtight chamber of second is balanced to it is steady when guaranteeing the long-time vibration of product, improves the performance reliability.

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

Drawings

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

Fig. 1 is a schematic view of a structure of an acoustic device provided with a passive radiator according to the related art 2.

Fig. 2 is a graph showing a test of loudness at different frequencies (SPL curve) of an acoustic device in which a passive radiator is provided according to the related art 2 and an acoustic device in which a conventional structure according to the related art 1 is provided.

Fig. 3 is a schematic structural diagram of an acoustic device according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of an operating state of an acoustic device according to an embodiment of the present invention.

Fig. 5 is a test curve (SPL curve) of loudness of an acoustic device according to an embodiment of the present invention at different frequencies from an acoustic device of a conventional structure of the prior art 1.

Fig. 6 is a test curve (SPL curve) of loudness at different frequencies of an acoustic device according to an embodiment of the present invention and an acoustic device in which a passive radiator is provided in related art 2.

Fig. 7 is a schematic structural diagram of an acoustic device according to another embodiment of the present invention.

Fig. 8 is a schematic structural view of an acoustic device according to still another embodiment of the present invention.

Fig. 9 is a schematic structural diagram of an acoustic device according to still another embodiment of the present invention.

FIG. 10 is a further modification of FIG. 9;

fig. 11 is a schematic structural view of an electronic apparatus using an acoustic device according to the present invention.

Fig. 12 is a partially enlarged view of fig. 11.

Description of reference numerals:

1: a sound emitting unit; 11: vibrating the diaphragm; 2: a first housing; 21: a first closed cavity; 22, a flexible deformation part; 23: a pressure equalizing hole; 3: a second housing; 31, a second closed cavity; 4: a sound outlet; 5: an electronic device.

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 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.

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 first embodiment is as follows:

as shown in fig. 3, an acoustic device includes a sound generating unit 1, where in the present embodiment, the sound generating unit 1 is a miniature sound generating unit, and more specifically, the sound generating unit 1 is a miniature moving-coil speaker. The sound production unit 1 generally comprises a shell, a vibration system and a magnetic circuit system, wherein the vibration system and the magnetic circuit system are accommodated and fixed in the shell, the vibration system comprises a vibration diaphragm 11 fixed on the shell and a voice coil combined on the vibration diaphragm 11, a magnetic gap is formed in the magnetic circuit system, the voice coil is arranged in the magnetic gap, and the voice coil reciprocates up and down in a magnetic field after alternating current is introduced into the voice coil, so that the vibration diaphragm 11 is driven to vibrate and produce sound.

The acoustic device is provided with a sound outlet 4, sound waves on the front side of the vibrating diaphragm 11 radiate outwards through the sound outlet 4, and sound waves on the rear side of the vibrating diaphragm 11 are left in the acoustic device. A cavity is formed between the vibrating diaphragm 11 and the housing and the magnetic circuit system, a rear sound hole is generally formed on the housing or the magnetic circuit system or between the housing and the magnetic circuit system, and sound waves at the rear side of the vibrating diaphragm 11 can enter the interior of the acoustic device through the rear sound hole. In this embodiment, the vibration direction of the vibration diaphragm 11 of the sound generating unit 1 is parallel to the thickness direction of the acoustic device, which is advantageous for the thin design of the acoustic device.

Further, in this embodiment, the rear side of the vibrating diaphragm 11 forms a sealed cavity, the sealed cavity is separated by a partition into a first sealed cavity 21 and a second sealed cavity 31, wherein the partition can be flexibly deformed at least partially, the part that can be flexibly deformed at least partially is a flexible deformation part 22, the first sealed cavity 21 is adjacent to the vibrating diaphragm 11, and the second sealed cavity 31 is far away from the vibrating diaphragm 11. Further, in the present embodiment, the volume of the second closed chamber 31 is larger than the volume of the first closed chamber 21.

When the vibrating diaphragm 11 vibrates, the sound pressure inside the first closed cavity 21 changes, and the flexible deformation part 22 of the spacing part deforms along with the change of the sound pressure inside the first closed cavity 21, so that the flexible adjustment of the volume of the first closed cavity 21 is performed; the second closed cavity 31 seals the sound wave generated by the flexible deformation part 22 during deformation in the second closed cavity 31.

In this embodiment, at least a part of the housing of the electronic device for mounting the acoustic device is used to form the first closed chamber 21 and/or the second closed chamber 31. The electronic device 5 may be a mobile phone, a tablet computer, a notebook computer, or the like. That is, a part or the whole of the chamber wall of the first sealed chamber 21 is formed by the case of the electronic device, a part or the whole of the chamber wall of the second sealed chamber 31 is formed by the case of the electronic device, or a part or the whole of the chamber walls of the first sealed chamber 21 and the second sealed chamber 31 is formed by the case of the electronic device. The utility model discloses in, the cavity wall in first airtight chamber and/second airtight chamber is done concurrently to electronic equipment's casing, can the inside space of make full use of electronic equipment, practices thrift the space that partly cavity wall occupy simultaneously, is favorable to electronic equipment's slim design more.

Further, in this embodiment, a pressure equalizing hole 23 is formed in the flexible deformation portion to communicate the first sealed cavity with the second sealed cavity, and the pressure equalizing hole 23 can balance internal and external air pressures and has no significant influence on rapid change of sound pressure. Compared with the structure that the pressure equalizing hole is formed in the plastic shell in the product in the prior art, the pressure equalizing hole is formed in the plastic shell by injection molding, so that the processing cost is high, the size of the pressure equalizing hole is limited, the size of the pressure equalizing hole can not be below 0.3mm generally, and extra space is occupied; in the embodiment, the pressure equalizing holes are formed in the thin flexible deformation portion, the flexible deformation portion and the pressure equalizing holes are integrally designed to save space, the pressure equalizing holes can be directly formed through punching or laser drilling, the machining process is simple, the cost is low, the size of the holes can be easily mastered, and the product quality and the consistency are good.

Specifically, the number of the pressure equalizing holes is one, and the aperture of each pressure equalizing hole is 0.3-1.0 mm. Or the pressure equalizing holes are a plurality of micropores which are dispersedly arranged, and the aperture of each micropore is 0.05 mm-0.15 mm.

Furthermore, damping mesh cloth can be covered on the pressure equalizing holes, and the acoustic resistance can be further adjusted through the damping mesh cloth.

As a specific embodiment, the acoustic device includes a first casing 2, the sound generating unit 1 is mounted on the first casing 2 to form a sound generating assembly, and the first sealed cavity 21 is formed between the diaphragm 11 of the sound generating unit 1 and the first casing 2; the acoustic device comprises a second shell 3, the sound generating assembly is arranged in the second shell 3, and a second closed cavity 31 is formed between the second shell 3 and the first shell 1; a part of the first housing 2 forms the spacer. However, when other components are present in the second casing 3, the second sealed chamber 31 is actually formed by the components and the gap between the second casing 3 and the first casing 2.

In this embodiment, the sound generating unit 1 is disposed inside the first housing 2, and both are formed as an integral structure, and then assembled with the second housing 3. The first casing 2 is provided with an opening with which the diaphragm front side space communicates, through which sound is radiated to the sound outlet 4 of the acoustic device.

In this embodiment, with reference to the configuration diagrams of the electronic apparatus shown in fig. 11 and 12, the acoustic device is mounted in the electronic apparatus such as a mobile phone, and the housing of the electronic apparatus also serves as the second housing 3 of the acoustic device. The space between the shell of the electronic equipment and the internal parts and the space between the shell of the electronic equipment and the first shell 2 of the acoustic device form a second closed cavity 31, the second shell of the acoustic device is omitted, the gap space between the parts of the shell of the electronic equipment is fully utilized, and the maximum design of the second closed cavity 31 can be realized.

As shown in fig. 4, when the acoustic device is in an operating state, when the diaphragm 11 vibrates downwards to compress the volume at the rear side of the diaphragm 11, the sound pressure is transmitted to the flexible deformation portion 22 through the first sealed cavity 21, and the flexible deformation portion 22 expands and deforms towards the outside of the first sealed cavity 21; on the contrary, when the diaphragm vibrates upwards, the flexible deformation portion 22 will contract inwards to deform, so as to adjust the volume of the first closed cavity 21. The flexible deformation portion 22 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 may have a flat plate shape, 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. Further, in order to improve the vibration effect, a composite sheet can be superimposed on the middle portion of the body of the flexible deformation portion 22, the strength of the composite sheet is higher than that of the body, and the composite sheet can be made of metal, plastic, carbon fiber or a composite structure thereof. In addition, the body of the flexible deformation portion 22 may be a sheet-shaped integral structure, or a structure with a hollowed middle part and a composite sheet, and when only the edge part is reserved in the hollowed middle part of the body of the flexible deformation portion 22, the edge part may be a flat plate or a shape protruding toward one side, or a wave shape.

In this embodiment, preferably, the flexible deformation portion 22 is integrally combined with other portions of the first housing 2, and as a specific scheme, the flexible deformation portion 22 may be manufactured first, and then the flexible deformation portion 22 is integrally injection-molded in other portions of the housing as an insert.

In the present embodiment, the main bodies of the first closed chamber 21 and the second closed chamber 31 extend in the 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.

The second casing 3 has a top wall, a bottom wall, and a side wall connecting the top wall and the bottom wall, and the sound outlet 4 of the acoustic device is provided on the top wall, the bottom wall, or the side wall.

According to the technical scheme of the embodiment, in the acoustic device, a closed cavity at the rear side of a vibrating diaphragm 11 is divided into a first closed cavity 21 and a second closed cavity 31 through a partition part, a flexible deformation part 22 is arranged on the partition part, the flexible deformation part 22 deforms along with sound pressure through the flexible deformation part 22, and the volume of the first closed cavity 21 is adjustable, so that the equivalent acoustic compliance of the first closed cavity 21 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 isolated flexible deformation portion 22 deformation process of second airtight chamber 31, seal the radiation sound wave of flexible deformation portion 22 inside acoustic device, avoid the antiphase radiation sound wave of flexible deformation portion 22, cause the offset influence to the forward radiation sound wave of sound generating unit 1, and then the low band sensitivity of product is promoted to great amplitude on the whole.

Moreover, in this embodiment, the volume of the second sealed cavity 31 is greater than the volume of the first sealed cavity 21, so that the flexible deformation portion 22 can deform more easily, which is more favorable for increasing the equivalent acoustic compliance of the first sealed cavity 21, effectively reducing the resonance frequency of the acoustic device, and improving the low-frequency sensitivity.

In prior art 1, the compliance of the acoustic device is formed by the compliance of the sound generating unit and the closed cavity in the box body in parallel, and the fs formula of prior art 1 is as follows:

wherein fs: a resonant frequency of the acoustic device; cas: equivalent sound compliance of the sound generating unit; cab: equivalent acoustic compliance of the air in the enclosure; mac: the vibration system of the sound generating unit is equivalent to the sound quality.

Fig. 2 is a test curve (SPL curve) of loudness of the acoustic device with the passive radiator of the prior art 2 and the acoustic device with the conventional structure of the prior art 1 at different frequencies, and fig. 5 is a test curve (SPL curve) of loudness of the acoustic device with the passive radiator/flexible deformation portion 22 of the prior art 1 at different frequencies, and the resulting compliance of the sound generating unit is increased due to compliance of the passive radiator/flexible deformation portion 22 connected in parallel, so that F0 is reduced. The fs formula for prior art 2 and this example is as follows:

wherein fs: a resonant frequency of the acoustic device; cas: equivalent sound compliance of the sound generating unit; cab: equivalent acoustic compliance of air in the first closed cavity; mac: the vibration system equivalent sound quality of the sound production unit; cap: equivalent acoustic compliance of passive radiator/flexible deformation.

In addition, in the prior art 2, the sound generating unit and the passive radiator radiate outward at the same time, the phases of sound waves of the sound generating unit and the passive radiator are opposite at frequencies below the resonance point fp, sound pressures are mutually offset, and the passive radiator plays a negative role in the sensitivity of the acoustic system.

Further, in this embodiment, referring to fig. 6, fig. 6 is a test curve (SPL curve) of loudness of the acoustic apparatus of this embodiment and the acoustic apparatus with passive radiator of the prior art 2 at different frequencies. Through setting up confined second airtight chamber 31, the sound wave that second airtight chamber 31 produced acoustic device vibrating diaphragm rear side is stayed in acoustic device's inside, specifically is kept apart the acoustic pressure that flexible deformation portion 22 produced through second airtight chamber 31, avoids the antiphase radiation sound wave that flexible deformation portion 22 deformation produced, causes the offset influence to the forward radiation sound wave of sound generating unit, and then the low band sensitivity of promotion product of great amplitude on the whole.

Example two:

as shown in fig. 7, the main difference between the present embodiment and the first embodiment is that the flexible deformation portion 22 in the present embodiment is a separate mounting component, a through hole is provided on a partition portion (not labeled), the flexible deformation portion 22 is mounted on the through hole, and specifically, the flexible deformation portion 22 is fixedly connected with the first housing portion around the through hole by bonding, welding or hot melting. The improved design is more convenient in material selection of the flexible deformation part 22, and can be combined with the first shell in a relatively practical mode. Meanwhile, the through hole is formed in the first shell, so that the product process can be simplified.

Example three:

the main difference between this embodiment and the above-mentioned embodiments is that the acoustic device in this embodiment is provided with a sound outlet channel, the sound outlet channel is designed corresponding to the sound outlet 4, and the sound wave in front of the vibrating diaphragm 11 is radiated to the sound outlet 4 through the sound outlet channel. The design meets the design requirements of partial terminal products, does not occupy the space of panels of mobile phones and the like, is beneficial to the design of full-screen and the like, and simultaneously avoids the shielding and interference of other parts to the full-screen and the like.

Specifically, as shown in fig. 8, the sound generating unit 1 is mounted in the first housing 2, and the sound outlet channel is also disposed on the first housing 2. In other embodiments, the sound emitting channel may be disposed on the second housing 3, and the sound emitting assembly is in butt joint with the sound emitting channel; or the sound outlet channel is separately arranged and is respectively butted with the sound outlet 4 and the sound production assembly.

Example four:

the main difference between this embodiment and the above-mentioned embodiments is that in this embodiment, the sound generating unit 1 and the first sealed cavity 21 are provided with a plurality of cavities one to one, the second sealed cavity 31 is provided with one, and a flexible deformation portion is provided on a spacing portion between each of the first sealed cavity 21 and the common second sealed cavity 31. Specifically, as shown in fig. 9, the acoustic device in this embodiment includes two sound generating units 1, and two first sealed cavities 21 are respectively and correspondingly designed at the same time, one second sealed cavity 31 is provided, a spacing portion is provided between each of the two first sealed cavities 21 and the second sealed cavity 32, and a flexible deformation portion 22 is respectively designed on the spacing portion. Such a design may facilitate applications in the case of acoustic devices or systems requiring multiple sound emitting units 1, such as design requirements in stereo or array form. The number of the first closed cavities in the embodiment can be other than the number of the first closed cavities, and the first closed cavities and the second closed cavities form closed cavities together.

As a further improvement of this embodiment, as shown in fig. 10, a plurality of sound generating units 1 are provided, and a plurality of sound generating units correspond to the same first sealed cavity 21, two sound generating units 1 are specifically provided in this embodiment, one second sealed cavity 31 is provided, and a flexible deformation portion 22 is provided between the first sealed cavity 21 and the second sealed cavity 31; this implementation process also can further improve, also can be a plurality ofly like second airtight chamber 31, and first airtight chamber 21 is one, all can realize the utility model discloses the technological effect of creation.

Example five:

the present embodiment discloses an electronic device 5, as shown in fig. 11 and 12, the acoustic device in the above embodiments is mounted on the electronic device 5, and the electronic device 5 may be a mobile phone, a tablet computer, a notebook, or the like.

The electronic device 5 comprises in particular a housing of the electronic device, at least a portion of which is intended to form the first closed chamber 21 and/or the second closed chamber 31 of the acoustic means. That is, a part or the whole of the chamber wall of the first sealed chamber 21 is formed by the case of the electronic device, a part or the whole of the chamber wall of the second sealed chamber 31 is formed by the case of the electronic device, or a part or the whole of the chamber walls of the first sealed chamber 21 and the second sealed chamber 31 is formed by the case of the electronic device. The utility model discloses in, the cavity wall of first airtight chamber 21 and/second airtight chamber 31 is done concurrently to electronic equipment's casing, can the inside space of make full use of electronic equipment, practices thrift the space that partly cavity wall occupy simultaneously, is favorable to electronic equipment's slim design more.

In this specific embodiment, the acoustic device includes a first casing 2, the sound generating unit 1 is mounted on the first casing 2 to form a sound generating assembly, and the first sealed cavity 21 is formed between the diaphragm 11 of the sound generating unit 1 and the first casing 2, wherein the partition is a part of the first casing 2, and a flexible deformation portion 22 is provided on the partition; the acoustic device further comprises a second shell 3, the sound generating assembly is arranged in the second shell 3, and a second closed cavity 31 is formed between the second shell 3 and the first shell 1. Wherein the second housing 3 is a housing of an electronic device. In fact, the space between the electronic device shell and the internal components and the space between the electronic device shell and the first shell 2 of the acoustic device form a second sealed cavity 31, the electronic device shell is also used as the second shell 3 of the acoustic device, the second shell of the acoustic device is omitted, the gap space between the electronic device shell components is fully utilized, the maximized design of the second sealed cavity 31 can be realized, and the thinned design of the electronic device is facilitated.

Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the 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 comprises a sound production unit, wherein 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 method is characterized in that:

the rear side of the vibrating diaphragm forms a closed cavity, the closed cavity is divided into a first closed cavity and a second closed cavity by a partition part, wherein the partition part can be at least partially flexibly deformed, the first closed cavity is adjacent to the vibrating diaphragm, the second closed cavity is far away from the vibrating diaphragm, and the second closed cavity seals sound waves generated by the flexible deformation part of the partition part during deformation in the second closed cavity;

2. The acoustic device according to claim 1, wherein the pressure equalization hole is one, and the diameter of the pressure equalization hole is 0.3-1.0 mm.

3. The acoustic device according to claim 1, wherein the pressure equalizing hole is a plurality of micro holes distributed, and each of the micro holes has a hole diameter of 0.05mm to 0.15 mm.

4. The acoustic device according to claim 2, wherein the flexible deformation portion is provided with a damping mesh cloth covering the pressure equalizing hole.

5. The acoustic device of claim 1,

the sound production unit with first airtight chamber one-to-one is equipped with a plurality ofly, the airtight chamber of second is equipped with one, every first airtight chamber with be equipped with flexible deformation portion on the interval portion between the airtight chamber of second.

6. The acoustic device according to any of claims 1 to 5, wherein the acoustic device comprises a first housing, the sound generating unit is mounted on the first housing to form a sound generating assembly, and the first sealed cavity is formed between a diaphragm of the sound generating unit and the first housing;

a portion of the first housing forms the spacer;

the second shell is a shell of the electronic equipment.

7. The acoustic device of claim 6, wherein the second housing has a top wall, a bottom wall, and a side wall connecting the top wall and the bottom wall, and the sound outlet is provided on the top wall, the bottom wall, or the side wall.

8. The acoustic device of claim 7,

the acoustic device is provided with a sound outlet channel corresponding to the sound outlet, and sound waves on the front side of the vibrating diaphragm are radiated to the sound outlet through the sound outlet channel, wherein,

9. The acoustic device of claim 6,

the flexible deformation part is an independent component and is fixedly connected with other parts of the first shell in an adhesion, welding or hot melting mode;

10. An electronic device, characterized in that: the electronic device comprising an acoustic apparatus according to any of claims 1-9;

a portion of the first housing forms the spacer;

the second shell is a shell of the electronic equipment.