Acoustic devices and electronic equipment

Abstract

The present invention discloses an acoustic device, comprising: a sound-emitting unit, the sound-emitting unit comprises a vibrating diaphragm, a sound outlet is arranged on the acoustic device, and the sound waves on the front side of the vibrating diaphragm are radiated outward through the sound outlet; a closed closed cavity is formed on the rear side of the vibrating diaphragm, and the closed cavity is divided into a first closed cavity and a second closed cavity by a partition, wherein the partition can be at least partially flexibly deformed, the first closed cavity is adjacent to the vibrating diaphragm, and the second closed cavity is far away from the vibrating diaphragm, and the volume of the second closed cavity is greater than the volume of the first closed cavity; the second closed cavity seals the sound waves generated by the flexible deformation part when deformed in the second closed cavity; at least a part of the housing of the electronic device for installing the acoustic device is used to form the first closed cavity and / or the second closed cavity. The acoustic device in the present invention can effectively reduce the resonant frequency and significantly improve the low-frequency sensitivity of the product as a whole.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technology, and more particularly to an acoustic device and an electronic device equipped with the acoustic device. Background Art

[0002] Generally speaking, the acoustic system of the traditional structure (prior art 1) includes a closed box and a sound-emitting unit arranged on the closed box, and a chamber is formed between the closed box and the sound-emitting unit. Due to the volume limitation of the chamber in the acoustic system, it is difficult for the acoustic system, especially a small acoustic system, to achieve the effect of satisfactory bass reproduction. Conventionally, in order to achieve satisfactory bass reproduction in the acoustic system, two methods are usually adopted. One is to set a sound-absorbing material (such as activated carbon, zeolite, etc.) in the box of the acoustic system to adsorb or desorb the gas in the box, thereby increasing the volume and reducing the low-frequency resonance frequency. The other is to set a passive radiator on the box of the acoustic system (prior art 2), for example Figure 1 As shown, 10 is a sound unit, 20 is a box of an acoustic system, and 30 is a passive radiator. The sound unit and the passive radiator radiate sound to the outside at the same time. By using the principle that the passive radiator and the box form a strong resonance at a specific frequency point fp (resonance frequency point), the sound waves of the sound unit and the passive radiator are connected and superimposed, and the local sensitivity near the resonance frequency point fp is enhanced (for example, see patent CN1939086A). However, both of the above methods have problems. The first solution of adding sound-absorbing materials to the box needs to achieve a good sealing package of the sound-absorbing materials. Otherwise, if the sound-absorbing materials enter the speaker unit, the acoustic performance of the speaker unit is damaged and the service life of the speaker unit is affected; the second solution of using a passive radiator, near the resonance frequency point fp, the passive radiator radiates strongly, and the sound unit almost stops, so the local sensitivity of the acoustic system can be enhanced in the frequency band near fp through the high sensitivity design of the passive radiator; but in the frequency band below fp, the passive radiator and the sound wave of the sound unit are in opposite phase, and the sound waves cancel each other out, and the passive radiator has a negative effect on the sensitivity of the acoustic system. In short, passive radiators can only improve the sensitivity of the frequency band near the resonance point, but cannot improve the entire low-frequency band. Figure 2 As shown, Figure 2 It is the test curve (SPL curve) of loudness at different frequencies of prior art 2 and prior art 1. Therefore, it is necessary to make further improvements to the defects of the prior art. Summary of the invention

[0003] One object of the present invention is to provide an acoustic device that can effectively reduce the resonant frequency and significantly improve the low-frequency sensitivity of the product as a whole.

[0004] In order to solve the above technical problems, the present invention provides a technical solution: an acoustic device, comprising:

[0005] A sound-generating unit, the sound-generating unit comprising a vibrating diaphragm, the acoustic device being provided with a sound outlet, through which the sound waves on the front side of the vibrating diaphragm are radiated outward;

[0006] A sealed closed cavity is formed at the rear side of the vibration diaphragm, and the sealed cavity is partitioned into a first sealed cavity and a second sealed cavity by a partition, wherein the partition can be at least partially flexibly deformed, the first sealed cavity is adjacent to the vibration diaphragm, and the second sealed cavity is far away from the vibration diaphragm; the volume of the second sealed cavity is greater than that of the first sealed cavity;

[0007] When the vibrating diaphragm vibrates, the internal sound pressure of the first closed cavity changes, and the flexible deformation portion of the spacer portion is deformed along with the sound pressure change in the first closed cavity, so as to flexibly adjust the volume of the first closed cavity; the second closed cavity confines the sound waves generated by the flexible deformation portion when deformed in the second closed cavity;

[0008] At least a portion of a housing of an electronic device for mounting an acoustic device is used to form the first enclosed cavity and / or the second enclosed cavity.

[0009] Preferably, the main bodies of the first sealed cavity and the second sealed cavity extend in a horizontal direction perpendicular to a thickness direction of the acoustic device.

[0010] Preferably, the sound-emitting units and the first sealed cavities are provided in a one-to-one correspondence, and the second sealed cavity is provided with one, and a flexible deformation portion is provided on the spacing portion between each first sealed cavity and the second sealed cavity.

[0011] Preferably, there are one or more sound-emitting units, one first sealed cavity, and one or more second sealed cavities.

[0012] Preferably, the vibration direction of the vibrating diaphragm of the sound-emitting unit is parallel to the thickness direction of the acoustic device.

[0013] Preferably, the acoustic device includes a first shell, the sound unit is installed on the first shell to form a sound component, and the first closed cavity is formed between the vibration diaphragm of the sound unit and the first shell; the acoustic device includes a second shell, the sound component is installed in the second shell, and the second closed cavity is formed between the second shell and the first shell, and the sound component is installed in the second closed cavity; a part of the first shell forms the partition portion; the second shell is a shell of an electronic device.

[0014] Preferably, the second shell has a top wall, a bottom wall and a side wall connecting the top wall and the bottom wall, and the sound outlet is arranged on the top wall, the bottom wall or the side wall.

[0015] Preferably, the acoustic device is provided with a sound outlet channel corresponding to the sound outlet, and the sound waves on the front side of the vibrating diaphragm are radiated to the sound outlet through the sound outlet channel, wherein:

[0016] The sound generating unit is installed in the first housing, and the sound outlet channel is arranged on the first housing;

[0017] Alternatively, the sound outlet channel is provided on the second housing, and the sound-generating component is connected to the sound outlet channel;

[0018] Alternatively, the sound outlet channel is provided separately, and the sound outlet channel is connected to the sound outlet and the sound emitting component respectively.

[0019] Preferably, the flexible deformation part is an independent component, and the flexible deformation part is fixedly connected to other parts of the first shell by bonding, welding or hot melting;

[0020] Alternatively, the flexible deformation portion is integrated with other parts of the first shell.

[0021] Preferably, the sound-emitting unit is a miniature sound-emitting unit.

[0022] Another object of the present invention is to provide an electronic device, which includes the above-mentioned acoustic device, and the acoustic device can effectively reduce the resonant frequency and significantly improve the low-frequency sensitivity of the product as a whole.

[0023] In order to solve the above technical problem, the technical solution provided by the present invention is: an electronic device, wherein the electronic device comprises the above acoustic device.

[0024] Preferably, the electronic device comprises a housing of the electronic device, and at least a portion of the housing of the electronic device is used to form a first enclosed cavity and / or a second enclosed cavity.

[0025] Preferably, the acoustic device includes a first shell, the sound unit is installed on the first shell to form a sound assembly, and the first closed cavity is formed between the vibration diaphragm of the sound unit and the first shell; the acoustic device also includes a second shell, the sound assembly is installed in the second shell, and the second closed cavity is formed between the second shell and the first shell; a part of the first shell forms the partition portion; the second shell is a shell of an electronic device.

[0026] According to the technical solution provided by the present invention, in an acoustic device, the closed cavity on the rear side of the vibrating diaphragm is partitioned into a first closed cavity and a second closed cavity by a partition, and a flexible deformation portion is provided on the partition. By setting the flexible deformation portion, the flexible deformation portion is deformed with the sound pressure, and 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, and improving the low-frequency sensitivity; and through the isolation design of the sound unit and the flexible deformation portion, the radiated sound waves of the flexible deformation portion are enclosed in the inside of the acoustic device, avoiding the anti-phase radiated sound waves of the flexible deformation portion, which have a canceling effect on the forward radiated sound waves of the sound unit, thereby significantly improving the low-frequency sensitivity of the product as a whole.

[0027] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 It is a schematic diagram of the structure of an acoustic device with a passive radiator according to prior art 2.

[0030] Figure 2 It is a test curve (SPL curve) of the loudness at different frequencies of the acoustic device of prior art 2 with a passive radiator and the acoustic device of prior art 1 with a traditional structure.

[0031] Figure 3 is a schematic structural diagram of an acoustic device according to an embodiment of the present invention.

[0032] Figure 4 Schematic diagram of the working state of an acoustic device according to an embodiment of the present invention.

[0033] Figure 5 1 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 with a traditional structure in prior art 1.

[0034] Figure 6 It 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 with a passive radiator in prior art 2.

[0035] Figure 7 is a schematic structural diagram of an acoustic device according to another embodiment of the present invention.

[0036] Figure 8 is a schematic structural diagram of an acoustic device according to yet another embodiment of the present invention.

[0037] Fig. 9 is a schematic structural diagram of an acoustic device according to yet another embodiment of the present invention.

[0038] Fig.10 yes Fig. 9 Further improvements;

[0039] Fig.11 Schematic diagram of the structure of an electronic device using an acoustic device according to the present invention.

[0040] Fig.12 yes Fig.11 A partial enlarged view of .

[0041] Description of reference numerals:

[0042] 1: sound unit; 11: vibration diaphragm; 2: first shell; 21: first closed cavity; 22: flexible deformation part; 23: pressure equalization hole; 3: second shell; 31: second closed cavity; 4: sound outlet; 5: electronic device. DETAILED DESCRIPTION

[0043] 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 components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0044] 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.

[0045] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0046] 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 embodiments may have different values.

[0047] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] Embodiment one:

[0049] like Figure 3As shown, an acoustic device includes a sound unit 1, wherein in this embodiment, the sound unit 1 is a miniature sound unit, more specifically, the sound unit 1 is a miniature dynamic speaker. The sound unit 1 generally includes a housing and a vibration system and a magnetic circuit system accommodated and fixed in the housing, the vibration system includes a vibration diaphragm 11 fixed on the housing and a voice coil combined with the vibration diaphragm 11, the magnetic circuit system forms a magnetic gap, the voice coil is arranged in the magnetic gap, and after the voice coil is passed through the alternating current, it reciprocates up and down in the magnetic field, thereby driving the vibration diaphragm 11 to vibrate and produce sound.

[0050] The acoustic device is provided with a sound outlet 4, through which the sound waves on the front side of the vibrating diaphragm 11 are radiated to the outside, and the sound waves on the rear side of the vibrating diaphragm 11 are retained inside the acoustic device. A chamber is formed between the vibrating diaphragm 11, the housing, and the magnetic circuit system. Generally, a rear sound hole is provided on the housing or the magnetic circuit system or between the two, through which the sound waves on the rear side of the vibrating diaphragm 11 enter the interior of the acoustic device. In this embodiment, the vibration direction of the vibrating diaphragm 11 of the sound-emitting unit 1 is parallel to the thickness direction of the acoustic device, which is conducive to the thin design of the acoustic device.

[0051] Further, in this embodiment, a closed closed cavity is formed on the rear side of the vibration diaphragm 11, and the closed cavity is divided into a first closed cavity 21 and a second closed cavity 31 by a partition, wherein the partition can be at least partially flexibly deformed, and the portion that can be at least partially flexibly deformed is a flexible deformation portion 22, the first closed cavity 21 is adjacent to the vibration diaphragm 11, and the second closed cavity 31 is away from the vibration diaphragm 11. Further, in this embodiment, the volume of the second closed cavity 31 is greater than the volume of the first closed cavity 21.

[0052] When the vibrating diaphragm 11 vibrates, the internal sound pressure of the first closed cavity 21 changes, and the flexible deformation portion 22 of the spacer portion is deformed as the sound pressure in the first closed cavity 21 changes, thereby flexibly adjusting the volume size of the first closed cavity 21; the second closed cavity 31 confines the sound waves generated by the flexible deformation portion 22 when deformed within the second closed cavity 31.

[0053] In this embodiment, at least a portion of the shell of the electronic device for installing the acoustic device is used to form the first enclosed cavity 21 and / or the second enclosed cavity 31. Among them, the electronic device 5 can be a mobile phone, a tablet computer, a laptop computer, etc. That is, part or all of the cavity wall of the first enclosed cavity 21 is composed of the shell of the electronic device, or part or all of the cavity wall of the second enclosed cavity 31 is composed of the shell of the electronic device, or part or all of the cavity wall of the first enclosed cavity 21 and the second enclosed cavity 31 is composed of the shell of the electronic device. In the present invention, the shell of the electronic device also serves as the cavity wall of the first enclosed cavity and / or the second enclosed cavity, 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 the thin design of the electronic device.

[0054] It should be noted that the “closure” described in this embodiment and the present invention can be a completely closed physical structure or a relatively closed state. For example, the first closed cavity can include a pressure equalizing hole 23 opened based on the product usage requirements to balance the internal and external air pressures and have no significant effect on the rapid change of sound pressure, or other open hole structures, which are also regarded as closed cavities. For another example, the second closed cavity can include gaps generated when combined with the first closed cavity, as well as gaps in its own structure, which can effectively isolate the sound waves generated by the flexible deformation part and have no obvious effect on the sound waves generated by the sound-emitting unit, and are also regarded as closed cavities. Generally, the total area of ​​the above-mentioned openings or gaps does not exceed 20mm 2 .

[0055] As a specific embodiment, the acoustic device includes a first shell 2, the sound unit 1 is installed on the first shell 2 to form a sound assembly, and the first closed cavity 21 is formed between the vibration diaphragm 11 of the sound unit 1 and the first shell 2; the acoustic device includes a second shell 3, the sound assembly is installed in the second shell 3, and the second closed cavity 31 is formed between the second shell 3 and the first shell 1; a part of the first shell 2 forms the spacer. In the case where there are other components in the second shell 3, the second closed cavity 31 is actually formed by the gap between the components and the second shell 3 and the first shell 2.

[0056] In this embodiment, the sound unit 1 is arranged inside the first housing 2, and the two form an integral structure, and then assembled with the second housing 3. The first housing 2 is provided with an opening, and the space in front of the diaphragm is connected to the opening, through which the sound is radiated to the sound outlet 4 of the acoustic device.

[0057] In this embodiment, further combined Fig.11 and Fig.12In the structural diagram of the electronic device shown, 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 forms a second closed cavity 31, omitting the second housing of the acoustic device itself, making full use of the gap space between the housing components of the electronic device, and realizing the maximum design of the second closed cavity 31.

[0058] like Figure 4 As shown, when the acoustic device is in working state, when the vibrating diaphragm 11 vibrates downward to compress the volume on the rear side of the vibrating diaphragm 11, the sound pressure will be transmitted to the flexible deformation part 22 through the first closed cavity 21, and the flexible deformation part 22 will expand and deform toward the outside of the first closed cavity 21; on the contrary, when the diaphragm vibrates upward, the flexible deformation part 22 will shrink and deform inward, thereby adjusting the volume of the first closed cavity 21. Among them, the body of the flexible deformation part 22 can be a plastic material or a thermoplastic elastomer material, or a silicone rubber material, and can be a single layer or a multi-layer composite structure, and the body of the flexible deformation part can be a flat plate, or a partially raised or recessed structure, such as a central raised part, an edge raised part, or a structure combining a central raised part and an edge raised part. Further, in order to enhance the vibration effect, a composite sheet can be superimposed on the middle part of the body of the flexible deformation part 22, and the strength of the composite sheet is higher than that of the body, and can be metal, plastic, carbon fiber, or a composite structure thereof, etc. In addition, the body of the flexible deformation part 22 can be a sheet-like integral structure, or a structure with a hollow middle and a composite sheet. When the hollow middle structure of the body of the flexible deformation part 22 only retains the edge, the edge can be flat or convex to one side, or wavy.

[0059] In this embodiment, preferably, the flexible deformation part 22 is integrated with other parts of the first shell 2. As a specific solution, the flexible deformation part 22 can be manufactured first, and then the flexible deformation part 22 can be integrally injection molded into other parts of the shell as an insert.

[0060] In this embodiment, the main bodies of the first sealed cavity 21 and the second sealed cavity 31 extend in the horizontal direction formed by the length and width of the acoustic device, and the horizontal direction can also be defined as a direction perpendicular to the thickness direction of the acoustic device. The horizontal direction generally refers to the direction parallel to a horizontal plane when the acoustic device is placed on the horizontal plane. The two chambers are arranged along the horizontal direction, and try not to occupy the space in the height direction of the acoustic device, which is conducive to the thin design of the product.

[0061] 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 arranged on the top wall, the bottom wall or the side wall. Figure 3 and Figure 4As shown, in this embodiment, the sound outlet 4 is provided on the top wall, and a pressure equalizing hole 23 is provided on the first closed cavity 21 .

[0062] According to the technical solution of this embodiment, in the acoustic device, the closed cavity on the rear side of the vibrating diaphragm 11 is partitioned into a first closed cavity 21 and a second closed cavity 31 by a partition, and a flexible deformation portion 22 is provided on the partition. By providing the flexible deformation portion 22, the flexible deformation portion 22 is deformed with the sound pressure, and the volume of the first closed cavity 21 is adjustable, thereby increasing the equivalent acoustic compliance of the first closed cavity 21, effectively reducing the resonance frequency of the acoustic device, and improving the low-frequency sensitivity; the sound radiation generated during the deformation of the flexible deformation portion 22 is isolated by the second closed cavity 31, and the radiated sound waves of the flexible deformation portion 22 are enclosed in the acoustic device, so as to avoid the anti-phase radiated sound waves of the flexible deformation portion 22, which will cause a canceling effect on the forward radiated sound waves of the sound-emitting unit 1, thereby significantly improving the low-frequency sensitivity of the product as a whole.

[0063] Moreover, in this embodiment, the volume of the second closed cavity 31 is greater than the volume of the first closed cavity 21, which can make the deformation of the flexible deformation part 22 easier, and is more conducive to increasing the equivalent acoustic compliance of the first closed cavity 21, effectively reducing the resonance frequency of the acoustic device, and improving the low-frequency sensitivity.

[0064] In the prior art 1, the compliance of the acoustic device is formed by connecting the compliance of the sound-emitting unit and the closed cavity in the box in parallel. The fs formula of the prior art 1 is as follows:

[0065]

[0066] Wherein, fs: resonant frequency of the acoustic device; Cas: equivalent compliance of the sound unit; Cab: equivalent compliance of the air in the box; Mac: equivalent acoustic mass of the vibration system of the sound unit.

[0067] Prior art 2 and this embodiment, combined Figure 2 and Figure 5 As shown, Figure 2 It is a test curve (SPL curve) of the loudness at different frequencies of the acoustic device with a passive radiator in the prior art 2 and the acoustic device with a traditional structure in the prior art 1. Figure 5 It 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. Because the sound-emitting unit is connected in parallel with the compliance of a passive radiator / flexible deformation part 22, the final equivalent compliance increases, thereby reducing F0. The fs formula of the prior art 2 and this embodiment is as follows:

[0068]

[0069] Among them, fs: the resonant frequency of the acoustic device; Cas: the equivalent acoustic compliance of the sound-emitting unit; Cab: the equivalent acoustic compliance of the air in the first closed cavity; Mac: the equivalent acoustic mass of the vibration system of the sound-emitting unit; Cap: the equivalent acoustic compliance of the passive radiator / flexible deformation part.

[0070] Moreover, in the prior art 2, the sound-emitting unit and the passive radiator radiate outward at the same time, and at frequencies below the resonance point fp, the sound waves of the two are in opposite phases, the sound pressures cancel each other out, and the passive radiator has a negative effect on the sensitivity of the acoustic system.

[0071] Furthermore, in this embodiment, combined with Figure 6 As shown, Figure 6 It is a test curve (SPL curve) of the loudness at different frequencies of the acoustic device of this embodiment and the acoustic device with a passive radiator of the prior art 2. By setting a closed second closed cavity 31, the second closed cavity 31 retains the sound waves generated by the rear side of the diaphragm of the acoustic device inside the acoustic device. Specifically, the sound pressure generated by the flexible deformation part 22 is isolated by the second closed cavity 31, so as to avoid the anti-phase radiation sound waves generated by the deformation of the flexible deformation part 22, which will offset the forward radiation sound waves of the sound unit, thereby significantly improving the low-frequency sensitivity of the product as a whole.

[0072] Embodiment 2:

[0073] like Figure 7 As shown, the main difference between this embodiment and the first embodiment is that the flexible deformation part 22 in this embodiment is an independent installation component, and a through hole is provided on the isolation part (not shown), and the flexible deformation part 22 is installed on the through hole. Specifically, the flexible deformation part 22 is fixedly connected to the first shell part around the through hole by bonding, welding or hot melting. This improved design is more convenient in the selection of materials for the flexible deformation part 22, and can achieve a more practical combination with the first shell. At the same time, the through hole is provided on the first shell to simplify the product process.

[0074] Embodiment three:

[0075] The main difference between this embodiment and the above embodiment is that the acoustic device in this embodiment is provided with a sound outlet channel, which is designed corresponding to the sound outlet 4, and the sound waves on the front side of the vibration diaphragm 11 are radiated to the sound outlet 4 through the sound outlet channel. This design is more in line with the design requirements of some terminal products, does not occupy the space of the panel of the mobile phone, etc., is conducive to the design of the full screen, etc., and avoids the obstruction and interference of other components.

[0076] Specifically, Figure 8As shown, the sound unit 1 is installed in the first shell 2, and the sound outlet channel is also arranged on the first shell 2. In other embodiments, the sound outlet channel can also be arranged on the second shell 3, and the sound outlet component is connected to the sound outlet channel; or, the sound outlet channel is arranged separately, and the sound outlet channel is connected to the sound outlet 4 and the sound outlet component respectively.

[0077] Embodiment 4:

[0078] The main difference between this embodiment and the above embodiment is that in this embodiment, a plurality of sound-emitting units 1 and first sealed cavities 21 are provided in a one-to-one correspondence, and a second sealed cavity 31 is provided, and a flexible deformation portion is provided on the interval between each first sealed cavity 21 and a common second sealed cavity 31. Specifically, as Fig. 9 As shown, the acoustic device in this embodiment includes two sound-emitting units 1, and two first closed cavities 21 are respectively designed, and the second closed cavity 31 is one. A partition is provided between the two first closed cavities 21 and the second closed cavity 32, and a flexible deformation portion 22 is respectively designed on the partition. This design can facilitate the application of acoustic devices or systems that require multiple sound-emitting units 1, such as stereo or array design requirements. The first closed cavity in this embodiment can also be of other numbers, and together with a second closed cavity, form a closed cavity.

[0079] As a further improvement of this embodiment, Fig.10 As shown, there are multiple sound-emitting units 1, and the multiple sound-emitting units correspond to the same first closed cavity 21. In this embodiment, two sound-emitting units 1 are specifically provided, and the second closed cavity 31 is one. A flexible deformation portion 22 is provided between the first closed cavity 21 and the second closed cavity 31. The present implementation process can also be further improved, such as the second closed cavity 31 can also be multiple, and the first closed cavity 21 can be one, and the technical effect created by the present invention can be achieved.

[0080] Embodiment five:

[0081] This embodiment discloses an electronic device 5, such as Fig.11 and Fig.12 As shown, the acoustic device in the above embodiment is installed on the electronic device 5, and the electronic device 5 can be a mobile phone, a tablet computer, a notebook, etc.

[0082] The electronic device 5 specifically includes a shell of the electronic device, at least a portion of the shell of the electronic device is used to form the first enclosed cavity 21 and / or the second enclosed cavity 31 of the acoustic device. That is, part or all of the cavity wall of the first enclosed cavity 21 is constituted by the shell of the electronic device, or part or all of the cavity wall of the second enclosed cavity 31 is constituted by the shell of the electronic device, or part or all of the cavity wall of the first enclosed cavity 21 and the second enclosed cavity 31 is constituted by the shell of the electronic device. In the present invention, the shell of the electronic device also serves as the cavity wall of the first enclosed cavity 21 and / or the second enclosed cavity 31, which can make full use of the space inside the electronic device, while saving a portion of the space occupied by the cavity wall, which is more conducive to the thin design of the electronic device.

[0083] In this specific embodiment, the acoustic device includes a first shell 2, the sound unit 1 is installed on the first shell 2 to form a sound assembly, and the first closed cavity 21 is formed between the vibration diaphragm 11 of the sound unit 1 and the first shell 2, wherein the partition is a part of the first shell 2, and a flexible deformation portion 22 is provided on the partition; the acoustic device also includes a second shell 3, the sound assembly is installed in the second shell 3, and the second closed cavity 31 is formed between the second shell 3 and the first shell 1. The second shell 3 is the shell of the electronic device. In fact, the space between the shell of the electronic device and the internal components and the first shell 2 of the acoustic device forms the second closed cavity 31, and the shell of the electronic device also serves as the second shell 3 of the acoustic device, omitting the second shell of the acoustic device itself, making full use of the gap space between the shell components of the electronic device, and realizing the maximum design of the second closed cavity 31, which is conducive to the thin design of the electronic device.

[0084] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An acoustic device, characterized in that ,include: A sound-generating unit, the sound-generating unit comprising a vibrating diaphragm, the acoustic device being provided with a sound outlet, through which the sound waves on the front side of the vibrating diaphragm are radiated outward; A sealed closed cavity is formed at the rear side of the vibration diaphragm, and the sealed cavity is partitioned into a first sealed cavity and a second sealed cavity by a partition, wherein the partition is at least partially flexibly deformed, the first sealed cavity is adjacent to the vibration diaphragm, and the second sealed cavity is away from the vibration diaphragm; the volume of the second sealed cavity is greater than that of the first sealed cavity; When the vibrating diaphragm vibrates, the internal sound pressure of the first closed cavity changes, and the flexible deformation portion of the spacer portion is deformed along with the sound pressure change in the first closed cavity, so as to flexibly adjust the volume of the first closed cavity; the second closed cavity confines the sound waves generated by the flexible deformation portion when deformed in the second closed cavity; At least a portion of a housing of an electronic device for mounting an acoustic device is used to form the first enclosed cavity and / or the second enclosed cavity; The acoustic device comprises a first shell, the sound-generating unit is mounted on the first shell to form a sound-generating assembly, and the first closed cavity is formed between the vibration diaphragm of the sound-generating unit and the first shell; The acoustic device comprises a second shell, the sound generating assembly is installed in the second shell, and the second closed cavity is formed between the second shell and the first shell; A portion of the first housing forms the spacer; the second housing is a housing of an electronic device; The sound generating unit and the flexible deformation portion are arranged on the same side of the first shell and are staggered.

2. The acoustic device according to claim 1, characterized in that The main bodies of the first sealed cavity and the second sealed cavity extend in a horizontal direction perpendicular to a thickness direction of the acoustic device.

3. The acoustic device according to claim 1, characterized in that The sound-generating units and the first sealed cavities are provided in a one-to-one correspondence, and the second sealed cavity is provided with one, and a flexible deformation portion is provided on the spacing portion between each of the first sealed cavity and the second sealed cavity.

4. The acoustic device according to claim 1, characterized in that The number of the sound-emitting units is one or more, the number of the first sealed cavity is one, and the number of the second sealed cavity is one or more.

5. The acoustic device according to claim 1, characterized in that The vibration direction of the vibration diaphragm of the sound generating unit is parallel to the thickness direction of the acoustic device.

6. The acoustic device according to claim 1, characterized in that The second shell has a top wall, a bottom wall and a side wall connecting the top wall and the bottom wall, and the sound outlet is arranged on the top wall, the bottom wall or the side wall.

7. The acoustic device according to claim 6, characterized in that The acoustic device is provided with a sound outlet channel corresponding to the sound outlet, and the sound waves on the front side of the vibration diaphragm are radiated to the sound outlet through the sound outlet channel, wherein: The sound generating unit is installed in the first housing, and the sound outlet channel is arranged on the first housing; Alternatively, the sound outlet channel is provided on the second housing, and the sound-generating component is connected to the sound outlet channel; Alternatively, the sound outlet channel is provided separately, and the sound outlet channel is connected to the sound outlet and the sound emitting component respectively.

8. The acoustic device according to claim 1, characterized in that The flexible deformation part is an independent component, and the flexible deformation part is fixedly connected to other parts of the first shell by bonding, welding or hot melting; Alternatively, the flexible deformation portion is integrated with other parts of the first shell.

9. The acoustic device according to claim 1, characterized in that The sound unit is a micro sound unit.

10. An electronic device, characterized in that: The electronic device comprises the acoustic device as described in any one of claims 1-9.

11. The electronic device according to claim 10, characterized in that: The invention comprises a shell of an electronic device, wherein at least a part of the shell of the electronic device is used to form the first enclosed cavity and / or the second enclosed cavity.

12. The electronic device according to claim 11, characterized in that: The acoustic device comprises a first shell, the sound unit is installed on the first shell to form a sound assembly, and the first closed cavity is formed between the vibration diaphragm of the sound unit and the first shell; the acoustic device also comprises a second shell, the sound assembly is installed in the second shell, and the second closed cavity is formed between the second shell and the first shell; A portion of the first shell forms the partition; The second housing is a housing of an electronic device.

Images