WO2020125618A1

WO2020125618A1 - Acoustic device and electronic apparatus

Info

Publication number: WO2020125618A1
Application number: PCT/CN2019/125915
Authority: WO
Inventors: 刘春发; 徐同雁; 张成飞
Original assignee: 歌尔股份有限公司
Priority date: 2018-12-18
Filing date: 2019-12-17
Publication date: 2020-06-25

Abstract

Disclosed is an acoustic device, comprising a first sealed cavity and a second sealed cavity, with a spacing part therebetween capable of being at least partially flexible, wherein the first sealed cavity is adjacent to a vibrating diaphragm, and the second sealed cavity is away from the vibrating diaphragm; when the vibrating diaphragm vibrates, the internal sound pressure of the first sealed cavity is changed, a flexible deformation part of the spacing part generates deformation along with the change of the internal sound pressure of the first sealed cavity so as to flexibly adjust the volume of the first sealed cavity; the second sealed cavity seals sound waves, generated by the flexible deformation part during deformation, in the second sealed cavity; and the Young's modulus or strength of at least a local area of the flexible deformation part is less than that of the cavity wall of the first sealed cavity and/or the cavity wall of the second sealed cavity, and the Young's modulus of the whole or the local area of the flexible deformation part is less than or equal to 8000 MPa. According to the present invention, the acoustic device can effectively reduce resonant frequency, and greatly improve the low-frequency state sensitivity of products as a whole.

Description

Acoustic device and electronic equipment

Technical field

The present invention relates to the technical field of acoustics, and more particularly, to an acoustic device and electronic equipment installed with the acoustic device.

Background technique

Generally speaking, the acoustic system of the conventional structure (prior art 1) includes a closed box and a sound-generating unit provided on the closed box. A cavity is formed between the closed box and the sound-generating unit. Due to the cavity in the acoustic system Due to the limited volume, it is difficult for acoustic systems, especially small acoustic systems, to achieve satisfactory bass reproduction. Conventionally, in order to achieve satisfactory bass reproduction in an acoustic system, two methods are usually adopted. One is to place a sound absorbing material (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 cabinet of the acoustic system (prior art 2), as shown in Figure 1, where 10 is the sound Unit, 20 is the cabinet of the acoustic system, 30 is the passive radiator, the sound generating unit and the passive radiator simultaneously radiate sound to the outside, using the principle that the passive radiator and the cabinet form a strong resonance at a specific frequency point fp (resonance frequency point), The sound waves of both the sound emitting unit and the passive radiator are connected and superimposed 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 solution to add sound-absorbing material in the box needs to achieve a good sealed packaging of the sound-absorbing material, otherwise if the sound-absorbing material enters the speaker unit, the acoustic performance of the speaker unit will be damaged, affecting the speaker unit The service life of the second type; the second scheme using a passive radiator, near the resonance frequency point fp, the passive radiator radiates strongly, and the sounding unit is almost stopped, so the high sensitivity design of the passive radiator can be used to realize the acoustic system in the frequency band near fp The local sensitivity of is enhanced; but in the frequency band below fp, the passive radiator and the sounding unit have opposite phases of sound waves, and the sound waves cancel each other, and the passive radiator has a negative effect on the sensitivity of the acoustic system. In short, passive radiators can only increase the sensitivity of the frequency band near the resonance point, but not all the low frequency bands. As shown in FIG. 2, FIG. 2 is a test curve (SPL curve) of the loudness of the prior art 2 and the prior art 1 at different frequencies. Therefore, it is necessary to further improve the defects in the existing technology.

Summary of the invention

An object of the present invention is to provide an acoustic device that effectively reduces the resonance frequency and greatly improves the low-band sensitivity of the product as a whole.

To solve the above technical problems, the technical solution provided by the present invention is: an acoustic device, including:

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

A closed sealed cavity is formed on the rear side of the diaphragm, the sealed cavity is separated into a first sealed cavity and a second sealed cavity by a partition, wherein the partition can be at least partially flexibly deformed, and the first sealed cavity Adjacent to the vibrating diaphragm, the second closed cavity is away from the vibrating diaphragm;

When the vibrating diaphragm vibrates, the internal sound pressure of the first sealed cavity changes, and the flexible deformation portion of the partition part deforms with the change of the sound pressure in the first sealed cavity. The cavity is flexibly adjusted in volume; the second closed cavity seals the acoustic wave generated by the flexible deformation part during deformation in the second closed cavity;

The Young's modulus or strength of at least a partial region of the flexible deformation portion is smaller than the Young's modulus or strength of the cavity wall of the first enclosed cavity and/or the cavity wall of the second enclosed cavity, the flexible deformation The Young's modulus of all or part of the area is less than or equal to 8000Mpa.

Preferably, the ratio of the effective deformation area of the flexible deformation portion that can generate deformation to the effective vibration area of the diaphragm is greater than or equal to 10%.

Preferably, the thickness of the flexible deformation part is less than or equal to 0.5 mm.

Preferably, at least TPU, TPEE, LCP, PAR, PC, PA, PPA, PEEK, PEI, PEN, PES, PET, PI, PPS, PPSU, PSU, silicone, and rubber are used in all or part of the flexible deformation part At least one of them.

Preferably, the bodies of the first sealed cavity and the second sealed cavity extend in a horizontal direction perpendicular to the thickness direction of the acoustic device.

Preferably, the volume of the second sealed cavity is larger than the volume of the first sealed cavity, and the first sealed cavity is disposed in the second sealed cavity.

Preferably, the sound-generating unit and the first sealed cavity are provided in one-to-one correspondence with each other, and the second sealed cavity is provided with one, each between the first sealed cavity and the second sealed cavity A flexible deformation part is provided on the partition part.

Preferably, there are one or more sound emitting units, one first sealed cavity, and one or more second sealed cavity.

Preferably, the vibration direction of the vibration diaphragm of the sound generating unit is parallel to the thickness direction of the acoustic device.

Preferably, the acoustic device includes a first housing, the sound generating unit is mounted on the first housing to form a sound generating assembly, and the vibrating diaphragm of the sound generating unit forms the first housing A first enclosed cavity; the acoustic device includes a second housing, the sound-generating component is installed in the second housing, and the second enclosure is formed between the second housing and the first housing Cavity; a portion of the first housing forms the spacer.

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 On the wall.

Preferably, the acoustic device is provided with a sound output channel corresponding to the sound output port, and the sound wave on the front side of the diaphragm is radiated to the sound output port through the sound output channel, wherein,

The sound generating unit is installed in the first housing, and the sound output channel is provided on the first housing;

Or, the sound output channel is provided on the second housing, and the sound-generating component is docked with the sound output channel;

Alternatively, the sound output channels are provided separately, and the sound output channels are respectively docked with the sound output port and the sound-emitting assembly.

Preferably, the flexible deformation part is an independent component, and the flexible deformation part is fixedly connected to the other parts of the first housing by means of bonding, welding or hot-melting;

Alternatively, the flexible deformation part is integrated with other parts of the first housing.

Preferably, the second casing is a casing for mounting an electronic device of an acoustic device.

Preferably, the sound generating unit is a miniature sound generating unit.

Another object of the present invention is to provide an electronic device including the above-mentioned acoustic device, which can effectively reduce the resonance frequency and greatly improve the low-band sensitivity of the product as a whole.

In order to solve the above technical problems, the technical solution provided by the present invention is: an electronic device, the electronic device including the above-mentioned acoustic device.

Preferably, the electronic device includes a housing of the electronic device, and at least a part of the housing of the electronic device is used to form a first sealed cavity and/or a second sealed cavity.

Preferably, the acoustic device includes a first housing, the sound generating unit is mounted on the first housing to form a sound generating assembly, and the vibrating diaphragm of the sound generating unit forms the first housing A first closed cavity; the acoustic device further includes a second housing, the sound generating assembly is installed in the second housing, the second housing and the first housing form the second A sealed cavity; a part of the first casing forms the partition; the second casing is a casing of an electronic device.

According to the technical solution provided by the present invention, in the acoustic device, the sealed cavity on the rear side of the diaphragm is separated into a first sealed cavity and a second sealed cavity by a partition, and a flexible deformation portion is provided on the partition, and the flexible The Young's modulus or strength of the deformation section is at least a partial area smaller than the Young's modulus or strength of the cavity wall of the first sealed cavity and/or the cavity wall of the second sealed cavity, and all or The Young's modulus of the local area is less than or equal to 8000Mpa. The strength of the flexible deformation section under this Young's modulus is small and compliant, which can produce effective deformation, so that the volume of the first closed cavity can be adjusted, thereby increasing The equivalent acoustic compliance of the first closed cavity effectively reduces the resonance frequency of the acoustic device and improves the low-frequency sensitivity; and through the isolation design of the sound generating unit and the flexible deformation part, the radiation sound wave of the flexible deformation part is enclosed inside the acoustic device to avoid the flexible deformation part The reverse phase radiated sound waves have a counteracting effect on the forward radiated sound waves of the sounding unit, and thus the overall low-band sensitivity of the product is greatly improved.

Other features and advantages of the present invention will become clear by the following detailed description of exemplary embodiments of the present invention with reference to the drawings.

BRIEF DESCRIPTION

The drawings incorporated in and forming a part of the specification illustrate embodiments of the invention, and together with the description thereof, serve to explain the principles of the invention.

FIG. 1 is a schematic structural diagram of an acoustic device provided with a passive radiator in the prior art 2. FIG.

Fig. 2 is a test curve (SPL curve) of the loudness at different frequencies of the acoustic device of the prior art 2 provided with passive radiators and the acoustic device of the conventional structure of the prior art 1 at different frequencies.

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.

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

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

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

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

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

Figure 10 is a further improvement of Figure 9;

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

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

FIG. 13 is a test curve (SPL curve) of loudness of acoustic devices with different area ratios (area of flexible deformation portion/area of diaphragm) in different embodiments of the present invention at different frequencies.

14 is a test curve (SPL curve) of the loudness of the acoustic device at different frequencies under different Young's modulus of the flexible deformation portion in the embodiment of the present invention.

Description of reference signs:

1: sound-generating unit; 11: vibrating diaphragm; 2: first housing; 21: first closed cavity; 22: flexible deformation part; 23: pressure equalizing hole; 3: second housing; 31: second closed cavity ; 4: sound outlet; 5: electronic equipment.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that 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 unless specifically stated otherwise.

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

Techniques, methods and equipment known to those of ordinary skill in the related art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the description.

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

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, there is no need to discuss it further in subsequent drawings.

Example one:

As shown in FIG. 3, an acoustic device includes a sound-generating unit 1. In this embodiment, the sound-generating unit 1 is a miniature sound-generating unit. More specifically, the sound-generating unit 1 is a miniature moving coil speaker. The sound generating unit 1 generally includes a housing and a vibration system and a magnetic circuit system housed and fixed in the housing. The vibration system includes a diaphragm 11 fixed on the housing and a voice coil coupled to the diaphragm 11, the magnetic circuit system is formed with In the magnetic gap, the voice coil is arranged in the magnetic gap. After the alternating current is applied to the voice coil, it reciprocates up and down in the magnetic field, thereby driving the vibrating diaphragm 11 to vibrate and sound.

The acoustic device is provided with a sound outlet 4, the sound wave on the front side of the diaphragm 11 is radiated to the outside through the sound outlet 4, and the sound wave on the rear side of the diaphragm 11 is left inside the acoustic device. A cavity is formed between the diaphragm 11 and the housing and the magnetic circuit system. A rear acoustic hole is generally provided on the housing or the magnetic circuit system or between the two. The sound wave on the rear side of the diaphragm 11 will pass through the rear sound The hole enters the interior of the acoustic device. In this embodiment, the vibration direction of the vibrating diaphragm 11 of the sound generating unit 1 is parallel to the thickness direction of the acoustic device, which is beneficial to the thin design of the acoustic device.

Further, in this embodiment, a closed sealed cavity is formed on the rear side of the diaphragm 11, the sealed cavity is separated into a first sealed cavity 21 and a second sealed cavity 31 by a partition, wherein the partition may be at least partially flexible deformed, the The portion that can be deformed at least partially is the flexible deformation portion 22, the first sealed cavity 21 is adjacent to the diaphragm 11, and the second sealed cavity 31 is away from the diaphragm 11. Among them, the Young's modulus or strength of at least a partial area of the flexible deformation portion 22 is smaller than the Young's modulus or strength of the cavity wall of the first sealed cavity 21 and/or the cavity wall of the second sealed cavity 31, The Young's modulus of all or part of the area is less than or equal to 8000Mpa.

When the vibrating diaphragm 11 vibrates, the internal sound pressure of the first sealed cavity 21 changes, and the flexible deformation portion 22 of the spacing portion deforms according to the change of the sound pressure in the first sealed cavity 21. The first closed cavity 21 performs flexible adjustment of the volume; the second closed cavity 31 closes the acoustic wave generated by the flexible deformation portion 22 during deformation in the second closed cavity 31.

In a specific embodiment, the ratio of the effective deformation area of the flexible deformation portion 22 that can generate deformation to the effective vibration area of the diaphragm 11 is greater than or equal to 10%. With reference to FIG. 13, if the ratio is smaller than this, the area of the flexible deformation section 22 is too small. On the one hand, it will lead to insufficient compliance. On the other hand, the deformation of the flexible deformation section 22 has little effect on the adjustment of the volume of the cavity; The improvement is weak. When the ratio is greater than this, the low-band sensitivity of the product starts to increase significantly.

It should be noted that the “closed” described in this embodiment and the present invention may be fully enclosed in a physical structure, or may be in a relatively closed state. For example, the first closed chamber may include a The pressure equalizing hole 23, which balances the internal and external air pressure and has no significant effect on the rapid change of the sound pressure, or other open hole structure, is also regarded as a closed cavity. As another example, the second closed cavity may include a gap generated when combined with the first closed cavity, and a gap of its own structure, etc., which can effectively isolate the sound waves generated by the flexible deformation part, and have no significant effect on the sound waves generated by the sound generating unit , Also regarded as a closed cavity. In general, the total area of the openings or gaps does not exceed 20 mm ² .

As a specific embodiment, the acoustic device includes a first housing 2, the sound generating unit 1 is mounted on the first housing 2 to form a sound generating assembly, and the diaphragm 11 of the sound generating unit 1 and the The first closed cavity 21 is formed between the first housings 2; the acoustic device includes a second housing 3, the sound generating assembly is installed in the second housing 3, the second housing 3 and the The second closed cavity 31 is formed between the first housings 1; a portion of the first housing 2 forms the partition. When there are other components in the second housing 3, the second sealed cavity 31 is actually formed by the gap between the components and the second housing 3 and the first housing 2.

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

In a specific embodiment, further combined with the structural diagrams of the electronic device shown in FIGS. 11 and 12, the acoustic device is installed in an electronic device such as a mobile phone, and the housing of the electronic device also serves as the second housing 3 of the acoustic device. The space between the housing of the electronic device and the internal components and the first housing 2 of the acoustic device form a second closed cavity 31, omitting the second housing of the acoustic device itself, making full use of the components of the housing of the electronic device The gap space between them can realize the maximum design of the second closed cavity 31.

As shown in FIG. 4, when the acoustic device is in an operating state, when the diaphragm 11 vibrates downward to compress the volume on the rear side of the diaphragm 11, the sound pressure will be transmitted to the flexible deformation portion 22 through the first sealed cavity 21. The deformation portion 22 expands and deforms toward the outside of the first sealed cavity 21; conversely, when the diaphragm vibrates upward, the flexible deformation portion 22 contracts and deforms inward, thereby adjusting the volume of the first sealed cavity 21.

Wherein, the body of the flexible deformation portion 22 may be made of plastic material or thermoplastic elastomer material, or may be made of silicone rubber, and may be a one-layer or multi-layer composite structure, and the body of the flexible deformation portion may be flat, or Partially convex or concave structures, such as a central protrusion, an edge protrusion, or a combination of a central protrusion and an edge protrusion. Specifically, all or part of the flexible deformation portion 22 adopts at least TPU, TPEE, LCP, PAR, PC, PA, PPA, PEEK, PEI, PEN, PES, PET, PI, PPS, PPSU, PSU, silicone, and rubber. At least one. Moreover, the thickness of the flexible deformation portion is 0.5 mm or less, and if the thickness is too thick, the strength of the flexible deformation portion increases and the compliance becomes smaller, which is not conducive to deformation.

Further, in order to improve the vibration effect, a composite sheet may 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 may be metal, plastic, carbon fiber, or a composite structure thereof, etc. . In addition, the body of the flexible deformation portion 22 may be a sheet-like overall structure, or a structure with a hollowed-out and composite sheet in the middle. In the case where the hollowed-out structure of the flexible deformation portion 22 only retains the edge portion, the edge portion may be flat or The shape is convex toward one side or wavy.

Preferably, the volume of the second sealed cavity 31 formed by the second housing 3 in this embodiment is larger than the volume of the first sealed cavity 21. This design can make the deformation of the flexible deformation portion 22 easier, and it is more beneficial to increase the equivalent acoustic compliance of the first closed cavity 21, effectively reduce the resonance frequency of the acoustic device, and improve the sensitivity of low frequency.

In this embodiment, preferably, the flexible deformation portion 22 is integrated with other parts of the first housing 2. As a specific solution, the flexible deformation portion 22 may be manufactured first, and then the flexible deformation portion 22 as an insert is integrally injection molded In other parts of the housing.

In this embodiment, the bodies of the first sealed cavity 21 and the second sealed cavity 31 extend along the horizontal direction formed by the length and width of the acoustic device, and the horizontal direction can also be defined by the 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 .

The second housing 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. As shown in FIGS. 3 and 4, in this embodiment, the sound outlet 4 is provided on the top wall, and the first sealed cavity 21 is provided with a pressure equalizing hole 23.

According to the technical solution of this embodiment, in the acoustic device, the sealed cavity on the rear side of the diaphragm 11 is separated into a first sealed cavity 21 and a second sealed cavity 31 by a partition, and a flexible deformation portion 22 is provided on the partition by setting The flexible deformation portion 22 deforms with the sound pressure, and the volume of the first sealed cavity 21 is adjustable, thereby 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; The second sealed cavity 31 is used to isolate the sound radiation generated during the deformation of the flexible deformation portion 22, to seal the radiated sound wave of the flexible deformation portion 22 inside the acoustic device, and to avoid the reverse phase radiation of the flexible deformation portion 22 to the sound generating unit 1. The positive radiated sound waves cause a cancellation effect, which in turn greatly improves the product's low-band sensitivity. In addition, as shown in FIG. 14, the Young’s modulus of all or part of the flexible deformation section is 8000 MPa or less, and the strength of the flexible deformation section 22 under this Young's modulus is small and the compliance is large, which can Effective deformation is generated, and the low-band sensitivity of the product is greatly improved; above this Young's modulus, the strength of the flexible deformation portion 22 is greater, and the deformation range is smaller, which has no obvious effect on adjusting the sensitivity of the low-band.

In the prior art 1, the compliance of the acoustic device is formed by paralleling the compliance of the sound generating unit and the enclosed cavity in the cabinet. The fs formula of the prior art 1 is as follows:

Among them, fs: resonance frequency of the acoustic device; Cas: equivalent acoustic order of the sound-generating unit; Cab: equivalent acoustic order of the air in the cabinet; Mac: equivalent sound quality of the vibration system of the sound-generating unit.

In the prior art 2 and this embodiment, as shown in conjunction with FIGS. 2 and 5, FIG. 2 is a test of loudness at different frequencies for an acoustic device with a passive radiator in the prior art 2 and an acoustic device with a conventional structure in the prior art 1. Curve (SPL curve), FIG. 5 is a test curve (SPL curve) of the loudness of the acoustic device of this embodiment and the acoustic device of the prior art 1 at different frequencies (SPL curve), because the sound generating unit is connected in parallel with a passive radiator/flexible deformation section 22 The compliance results in an increase in the final equivalent compliance, so that F0 decreases. The fs formula of the prior art 2 and this embodiment is as follows:

Among them, fs: resonance frequency of the acoustic device; Cas: equivalent acoustic compliance of the sound-generating unit; Cab: equivalent acoustic compliance of air in the first closed cavity; Mac: equivalent sound quality of the vibration system of the sound-generating unit; Cap: passive radiation Equivalent smoothness of body/flexible deformation.

Moreover, in the prior art 2, the sound emitting unit and the passive radiator simultaneously radiate outwards. At frequencies below the resonance point fp, the phases of the sound waves are opposite, the sound pressures cancel each other out, and the passive radiator has a negative effect on the sensitivity of the acoustic system.

Further, in this embodiment, as shown in FIG. 6, FIG. 6 is a test curve (SPL curve) of loudness at different frequencies of the acoustic device of this embodiment and the acoustic device provided with a passive radiator in the prior art 2. By providing a closed second closed cavity 31, the second closed cavity 31 leaves the acoustic wave generated on the back side of the diaphragm of the acoustic device inside the acoustic device, specifically the sound generated by the flexible deformation portion 22 through the second closed cavity 31 Pressure isolation, to avoid the reverse phase radiation sound waves generated by the deformation of the flexible deformation section 22, which has a counteracting effect on the forward radiation sound waves of the sound generating unit, thereby improving the overall low-band sensitivity of the product to a large extent.

Example two:

As shown in FIG. 7, the main difference between this embodiment and the first embodiment is that the flexible deformation portion 22 in this embodiment is an independent mounting component, and a through hole is provided in the isolation portion (not shown), and the flexible deformation portion 22 is mounted on the through hole. Specifically, the flexible deformation portion 22 is fixedly connected to the first housing portion around the through hole by bonding, welding, or hot-melting. This improved design is more convenient in selecting materials of the flexible deformation portion 22, and can be combined with the first housing in a more realistic manner. At the same time, providing a through hole in the first housing can simplify the product process.

Example three:

The main difference between this embodiment and the above embodiments is that the acoustic device in this embodiment is provided with a sound output channel, which corresponds to the sound outlet 4 design, and the sound wave on the front side of the diaphragm 11 is radiated through the sound output channel to声声口4. This design is more in line with the design requirements of some terminal products, does not occupy the space of mobile phones and other panels, and is conducive to the design of full screens, while avoiding the shielding and interference of other components.

Specifically, as shown in FIG. 8, the sound generating unit 1 is installed in the first housing 2, and the sound output channel is also provided on the first housing 2. In other embodiments, it may be that the sound output channel is provided on the second housing 3 and the sound output component is docked with the sound output channel; or, the sound output channel is provided separately, and the sound output channel is respectively connected to the sound output port 4 and the sound output component Docking.

Example 4:

The main difference between this embodiment and the above-mentioned embodiment is that in this embodiment, there are a plurality of sound generating units 1 and a first sealed cavity 21 corresponding to each other, and one second sealed cavity 31 is provided, each of the first sealed The space between the cavity 21 and a common second sealed cavity 31 is provided with a flexible deformation portion. Specifically, as shown in FIG. 9, the flexible acoustic device in this embodiment includes two sound-emitting units 1, and two first sealed chambers 21 are correspondingly designed, one second sealed chamber 31 is one, and two first sealed Spaces are provided between the cavity 21 and the second closed cavity, and flexible deformation portions 22 are respectively designed on the space. This design can facilitate the application in the case of an acoustic device or system requiring multiple sounding units 1, such as the design requirements in the form of stereo or array. The first sealed cavity in this embodiment may also be other numbers, and together form a sealed cavity with one second sealed cavity.

As a further improvement of this embodiment, as shown in FIG. 10, there are a plurality of sound-generating units 1 and the plurality of sound-generating units correspond to the same first sealed cavity 21. In this embodiment, two sound-generating units 1 are specifically provided. There is one sealed cavity 31, and a flexible deformation portion 22 is provided between the first sealed cavity 21 and the second sealed cavity 31; this implementation process can be further improved, for example, the second sealed cavity 31 can also be multiple, the first sealed cavity 21 is one, all can achieve the technical effects created by the present invention.

Example 5:

This embodiment discloses an electronic device 5. As shown in FIGS. 11 and 12, the acoustic device in the above embodiment is installed on the electronic device 5. The electronic device 5 may be a mobile phone, a tablet computer, a notebook, or the like.

The electronic device 5 specifically includes a housing of the electronic device, and at least a part of the housing of the electronic device is used to form the first sealed cavity 21 and/or the second sealed cavity 31 of the acoustic device. That is, part or all of the cavity wall of the first closed cavity 21 is composed of the casing of the electronic device, or part or all of the cavity wall of the second closed cavity 31 is composed of the casing of the electronic device, or, Part or all of the cavity walls of the first sealed cavity 21 and the second sealed cavity 31 are constituted by the housing of the electronic device. In the present invention, the housing of the electronic device doubles as the cavity wall of the first sealed cavity 21 and/or the second sealed cavity 31, which can make full use of the space inside the electronic device, while saving part of the space occupied by the cavity wall, which is more conducive to Thin design of electronic equipment.

In this specific embodiment, the acoustic device includes a first housing 2, the sound generating unit 1 is mounted on the first housing 2 to form a sound generating assembly, and the diaphragm 11 of the sound generating unit 1 and the The first sealed cavity 21 is formed between the first housings 2, wherein the partition is a part of the first housing 2, and the partition is provided with a flexible deformation portion 22; the acoustic device further includes a second housing 3 The sound generating component is installed in the second housing 3, and the second closed cavity 31 is formed between the second housing 3 and the first housing 1. Wherein, the second casing 3 is a casing of an electronic device. In fact, the space between the electronic equipment casing and the internal components and the first casing 2 of the acoustic device forms a second closed cavity 31, and the electronic equipment casing also serves as the second casing 3 of the acoustic device, omitting The second casing of the acoustic device makes full use of the gap space between the components of the casing of the electronic device, which can realize the maximum design of the second closed cavity 31, which is beneficial 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, 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 includes:

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

A closed sealed cavity is formed on the rear side of the diaphragm, the sealed cavity is separated into a first sealed cavity and a second sealed cavity by a partition, wherein the partition can be at least partially flexibly deformed, and the first sealed cavity Adjacent to the vibrating diaphragm, the second closed cavity is away from the vibrating diaphragm;

When the vibrating diaphragm vibrates, the internal sound pressure of the first sealed cavity changes, and the flexible deformation portion of the partition part deforms with the change of the sound pressure in the first sealed cavity. The cavity is flexibly adjusted in volume; the second closed cavity seals the acoustic wave generated by the flexible deformation part during deformation in the second closed cavity;

The flexible deformation portion has a Young's modulus or strength at least in a partial region that is less than the Young's modulus or strength of the cavity wall of the first enclosed cavity and/or the cavity wall of the second enclosed cavity, the flexible deformation portion The Young's modulus of all or part of the area is less than or equal to 8000Mpa.
The acoustic device according to claim 1, wherein a ratio of an effective deformation area of the flexible deformation portion that can generate deformation to an effective vibration area of the diaphragm is greater than or equal to 10%.
The acoustic device according to claim 1, wherein the thickness of the flexible deformation portion is 0.5 mm or less.
The acoustic device according to claim 3, characterized in that at least TPU, TPEE, LCP, PAR, PC, PA, PPA, PEEK, PEI, PEN, PES, PET At least one of PI, PPS, PPSU, PSU, silicone, and rubber.
The acoustic device according to any one of claims 1 to 4, wherein

The bodies of the first sealed cavity and the second sealed cavity extend in a horizontal direction perpendicular to the thickness direction of the acoustic device.
The acoustic device according to any one of claims 1 to 4, wherein

The volume of the second closed cavity is larger than the volume of the first closed cavity.
The acoustic device according to any one of claims 1 to 4, wherein

The sound-generating unit and the first sealed cavity are provided in a one-to-one correspondence with each other, and the second sealed cavity is provided with one, each on the space between the first sealed cavity and the second sealed cavity With a flexible deformation section.
The acoustic device according to any one of claims 1 to 4, wherein

There are one or more sound generating units, one first sealed cavity, and one or more second sealed cavity.
The acoustic device according to any one of claims 1 to 4, wherein

The vibration direction of the vibration diaphragm of the sound generating unit is parallel to the thickness direction of the acoustic device.
The acoustic device according to any one of claims 1 to 4, wherein the acoustic device includes a first housing, and the sound generating unit is mounted on the first housing to form a sound generating assembly, the sound generating The first closed cavity is formed between the vibration diaphragm of the unit and the first housing;

The acoustic device includes a second housing, and the sound generating assembly is installed in the second housing, and the second sealed cavity is formed between the second housing and the first housing;

A part of the first housing forms the partition.
The acoustic device according to claim 10, 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 in the On the top wall, the bottom wall or the side wall.
The acoustic device according to claim 11, characterized in that

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

The sound generating unit is installed in the first housing, and the sound output channel is provided on the first housing;

Or, the sound output channel is provided on the second housing, and the sound-generating component is docked with the sound output channel;

Alternatively, the sound output channels are provided separately, and the sound output channels are respectively docked with the sound output port and the sound-emitting assembly.
The acoustic device according to claim 10, characterized in that

The flexible deformation part is an independent component, and the flexible deformation part is fixedly connected to the other parts of the first housing by means of bonding, welding, or hot-melting;

Alternatively, the flexible deformation part is integrated with other parts of the first housing.
The acoustic device according to claim 10, wherein the second housing is a housing for an electronic device for mounting the acoustic device.
The acoustic device according to any one of claims 1 to 4, wherein the sound generating unit is a miniature sound generating unit.
An electronic device, characterized in that the electronic device comprises the acoustic device according to claims 1-15.
The electronic device according to claim 16, comprising a housing of the electronic device, at least a part of the housing of the electronic device is used to form the first closed cavity;

And/or, at least a part of the housing of the electronic device is used to form the second closed cavity.
The electronic device according to claim 17, wherein the acoustic device includes a first housing, the sound generating unit is mounted on the first housing to form a sound generating assembly, and the vibration diaphragm of the sound generating unit is The first closed cavity is formed between the first housings; the acoustic device further includes a second housing, the sound generating assembly is installed in the second housing, the second housing and the The second closed cavity is formed between the first housings;

A part of the first housing forms the spacer;

The second casing is a casing of an electronic device.