CN117061958A - Vibrating plate, vibrating diaphragm assembly and sound generating device - Google Patents

Abstract

The invention provides a vibrating plate, a vibrating diaphragm assembly and a sound generating device, wherein the vibrating plate comprises a fiber paper layer and a waterproof and breathable layer which are arranged in a stacked manner, the fiber paper layer is at least positioned on one side surface layer of the vibrating plate, the fiber paper layer comprises a three-dimensional net structure at least composed of matrix fibers, the three-dimensional net structure is provided with meshes, and the diameter distribution of the meshes is 0.1-50 mu m. According to the vibrating plate provided by the invention, the vibrating plate is formed by the fiber paper layer and the waterproof and breathable layer, the structural strength of the vibrating plate can be effectively ensured by the three-dimensional net structure of the fiber paper layer, and the ventilation effect of the vibrating plate can be effectively ensured by the net holes of the three-dimensional net structure, so that the structural strength of the vibrating plate can also meet the use requirement on the basis of having the ventilation function and the waterproof function.

Description

Vibrating plate, vibrating diaphragm assembly and sound generating device

Technical Field

The invention belongs to the technical field of electroacoustic, and particularly relates to a vibrating plate, a vibrating diaphragm assembly and a sound generating device.

Background

For the current loudspeaker products, a sound leakage hole communicated with a rear cavity is arranged on a shell of the loudspeaker products, and gas in the rear cavity is communicated with external gas through the sound leakage hole so as to balance internal and external air pressure and prevent pressure difference between the rear cavity of the loudspeaker and the external air, so that the vibrating diaphragm is damaged irrecoverably under the action of pressure.

In the related art, a loudspeaker for wearing equipment is proposed, the waterproof level of wearing equipment is 5ATM, is equipped with the sound hole that lets out of intercommunication back chamber on wearing equipment's the shell, lets out sound hole department and pastes one deck waterproof ventilative layer, can allow certain air current to pass through on satisfying waterproof basis from this, plays the effect of balanced back chamber and external atmospheric pressure. However, the scheme needs to reserve a large enough area on the whole structure to be adhered with a waterproof breathable layer, and occupies the space of the whole structure.

Disclosure of Invention

An object of the present invention is to provide a vibration plate which is excellent in not only waterproof and air permeability but also high in strength.

It is still another object of the present invention to provide a diaphragm assembly comprising the diaphragm described above.

It is still another object of the present invention to provide a sound generating apparatus comprising the diaphragm assembly described above.

In order to achieve the above object, the present invention provides the following technical solutions.

A vibration plate according to an embodiment of a first aspect of the present invention includes: the fiber paper layer is at least positioned on one side surface layer of the vibrating plate, and comprises a three-dimensional net structure at least composed of matrix fibers, wherein the three-dimensional net structure is provided with meshes, and the diameter distribution of the meshes is 0.1-50 mu m.

According to some embodiments of the invention, the volume of the matrix fiber is 40% -100% of the volume of the fiber paper layer, the fiber paper layer further comprising: reinforcing fibers, wherein the reinforcing fibers are doped in the three-dimensional net structure to strengthen the mechanical strength of the three-dimensional net structure, and the volume of the reinforcing fibers accounts for 0-50% of the volume of the fiber paper layer; and the tackifying component is at least used for bonding the matrix fibers into a whole, and the volume of the tackifying component accounts for 0-40% of the volume of the fiber paper layer.

According to some embodiments of the invention, the vibration plate further comprises: the bonding layer is arranged between the fiber paper layer and the waterproof breathable layer, and the bonding layer is connected with the fiber paper layer and the waterproof breathable layer.

According to some embodiments of the invention, the adhesive layer is provided with a hollowed-out portion penetrating along the thickness direction thereof.

According to some embodiments of the invention, the fiber paper layer is two layers, and the bonding layers are respectively arranged between two sides of the waterproof breathable layer and the fiber paper layer.

According to some embodiments of the invention, the thickness of each of the fiber paper layers is equal to or greater than 10 μm.

According to some embodiments of the invention, the total thickness of the fiber paper layer is greater than the total thickness of the waterproof breathable layer.

According to some embodiments of the invention, the fibrous paper layer is composed of chopped fibers or continuous fibers having a length > 0.1mm, the chopped fibers or continuous fibers having a diameter distribution between 1 μm and 100 μm.

A diaphragm assembly according to an embodiment of the second aspect of the present invention includes a diaphragm and a diaphragm according to the above-described embodiment.

According to some embodiments of the invention, the fiber paper layers are arranged on two opposite side surfaces of the vibrating plate, the vibrating plate and the vibrating diaphragm are integrally injection molded, and part of the vibrating diaphragm is coated on the peripheral edge of the vibrating plate; or, the fiber paper layer is arranged on one side surface of the vibrating plate, and the fiber paper layer is connected with the inner fixing part of the vibrating diaphragm.

According to a third aspect of the present invention, a sound generating apparatus includes a diaphragm assembly according to the above embodiment.

According to the vibrating plate, the vibrating diaphragm assembly and the sound generating device provided by the embodiment of the invention, the vibrating plate is formed by the fiber paper layer and the waterproof and breathable layer, the structural strength of the vibrating plate can be effectively ensured by the three-dimensional net structure of the fiber paper layer, the ventilation effect of the vibrating plate can be effectively ensured by the net holes of the three-dimensional net structure, the waterproof and breathable performance of the vibrating plate can be ensured by the waterproof and breathable layer, and the structural strength of the vibrating plate can also meet the use requirement on the basis of having the ventilation function and the waterproof function. Because the vibrating plate has ventilation function, even when the gas in the acoustic cavity is heated and expanded, the vibrating plate is not easy to deviate from the balance position, so that the performance of the sound generating device is stable, and serious distortion is not easy to occur.

Other features of the present invention and its advantages 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 this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of a diaphragm assembly according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a vibration plate according to an embodiment of the present invention;

fig. 3 is an exploded view of a vibration plate according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an electronic device according to an embodiment of the present invention.

Reference numerals:

a vibration plate 100;

a fiber paper layer 10;

a waterproof breathable layer 20;

an adhesive layer 30; a hollowed-out portion 31;

a diaphragm 200; an upper connecting piece 201; a lower connecting piece 202;

a sound generating device 300; a front cover 301; a front acoustic cavity 302; a magnetic circuit system 303; a rear case 304; a first acoustic chamber 305;

an electronic device 400; a housing 401; sound outlet 402; a lower case 403; a second sound chamber 404.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

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

Techniques, methods, and apparatus known to one 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 specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

The vibration plate 100 according to the embodiment of the present invention is specifically described below with reference to the drawings.

As shown in fig. 1 to 4, a vibration plate 100 according to an embodiment of the present invention includes: the laminated fiber paper layer 10 and waterproof and breathable layer 20, the fiber paper layer 10 is at least positioned on one side surface layer of the vibration board 100, the fiber paper layer 10 comprises a three-dimensional net structure at least composed of matrix fibers, the three-dimensional net structure is provided with net holes, and the diameter distribution of the net holes is 0.1-50 μm.

In other words, the vibration plate 100 according to the embodiment of the present invention is mainly composed of two layers of the fiber paper layer 10 and the waterproof and breathable layer 20, wherein the number of layers of the fiber paper layer 10 is at least one, i.e., one layer or multiple layers. Similarly, the number of layers of the waterproof and breathable layer 20 may be one or more, and is not limited thereto.

The fiber paper layer 10 is a laminated structure made of fiber materials, and has certain strength and air permeability, the fiber paper layer 10 is arranged on the surface layer of at least one side of the vibration board 100, namely, the structure of the vibration board 100 can be that one side surface adopts the fiber paper layer 10, the other side surface adopts other materials, and the two side surfaces of the vibration board 100 also can both adopt the fiber paper layer 10, it can be understood that the fiber paper layer 10 and the vibration board 200 have good bonding performance, and the bonding strength between the vibration board 100 and the vibration board 200 can be improved when the vibration board 100 and the vibration board 200 are assembled by arranging the fiber paper layer 10 on the surface of at least one side of the vibration board 100, so that the waterproof effect of a product can be improved.

The fiber paper layer 10 according to an embodiment of the present invention contains at least a matrix fiber formed in a three-dimensional net structure having mesh openings with diameters ranging from 0.1 μm to 50 μm.

That is, in the present embodiment, the fiber paper layer 10 may be composed of matrix fibers to form a three-dimensional net structure. Wherein, this three-dimensional network structure has the mesh, can realize ventilative function through the mesh.

Alternatively, the diameter of the mesh is distributed in the range of 0.1 μm to 50 μm, and by the mesh being within the range of the diameter distribution, the fiber paper layer 10 can be ensured to have good air permeability and support. If the diameter distribution of the mesh is less than 0.1 μm, the air permeability of the fiber paper layer 10 is liable to be insufficient, resulting in that the vibration plate 100 needs a long time to return to the equilibrium position; on the other hand, if the diameter distribution of the mesh is more than 50 μm, the supportability of the fiber paper layer 10 is easily made low, so that the strength of the vibration plate 100 is low, failing to meet the practical use requirement. For example, the mesh holes of the fiber paper layer 10 have diameters of 0.1 μm, 1 μm, 5 μm, 10 μm, 20 μm, 30 μm, 50 μm, or the like, and by using the above-listed mesh holes, the fiber paper layer 10 is advantageous in having both good air permeability and strong support, thereby ensuring air permeability and strength of the vibration plate 100, and ensuring sound emitting devices to which the vibration plate 100 is applied have good acoustic properties and mechanical properties.

The structural characteristics of the fiber paper layer 10 and the waterproof and breathable layer 20 enable the fiber paper layer 10 and the waterproof and breathable layer 20 to be respectively provided with the communicated air holes, so that the vibration board 100 has a breathable function. Since the waterproof and breathable layer 20 also has a waterproof effect, the vibration plate 100 also has a waterproof function. That is, the vibration plate 100 of the embodiment of the present invention has both air permeability and water resistance.

Since the strength of the vibration plate 100 is related to the thickness, and the thickness of the vibration plate 100 affects the weight of the vibration plate 100, it is necessary to strictly control the thickness of the vibration plate 100. When the thickness of the vibration plate 100 is too high, the mass of the vibration plate 100 may be greatly increased, which affects the lightweight design of the product, and the cost is high, and when the thickness of the vibration plate 100 is too small, the strength of the vibration plate 100 is difficult to meet the use requirement. Therefore, in some embodiments of the present invention, by controlling the total thickness of the vibration plate 100 to be between 50 μm and 1000 μm, for example, 50 μm, 60 μm, 80 μm, 100 μm, 200 μm, 300 μm, 500 μm, 1000 μm, etc., the vibration plate 100 can have not only a ventilation effect but also a supporting effect, so that the vibration plate 100 can have a certain strength on the basis of ensuring the ventilation of the vibration plate 100, thereby satisfying actual use requirements.

Moreover, since the vibration board 100 of the embodiment of the present invention is composed of the fiber paper layer 10 and the waterproof and breathable layer 20, the requirements of waterproof and breathable of the sound generating device can be solved without arranging vent hole patches or waterproof and breathable layers on the vibration board 100 or the housing of the sound generating device. It can be seen that the vibration plate 100 according to the embodiment of the invention not only can realize waterproof and ventilation effects, but also has the advantage of effectively preventing waterproof failure. In addition, the vibration plate 100 of the embodiment of the invention can ensure the waterproof and ventilation functions without punching, effectively ensure the large ventilation area and good consistency of the vibration plate 100, and also ensure that the structural strength of the vibration plate 100 is not affected by punching. When the vibration plate 100 of the embodiment of the present invention is applied to a sound emitting device, the waterproof property, the air permeability and the stability of the sound emitting device can be ensured.

Therefore, according to the vibration board 100 of the embodiment of the invention, the vibration board 100 is formed by the fiber paper layer 10 and the waterproof breathable layer 20, the structural strength of the vibration board 100 can be effectively ensured by the three-dimensional net structure of the fiber paper layer 10, the ventilation effect of the vibration board 100 can be effectively ensured by the net holes of the three-dimensional net structure, the waterproof breathable layer 20 can ensure the waterproof breathable performance of the vibration board 100, and the structural strength of the vibration board 100 can also meet the use requirement on the basis of having the ventilation function and the waterproof function. Since the vibration plate 100 has the ventilation function, even when the gas in the acoustic cavity expands due to heating, the vibration plate 100 is not easy to deviate from the balance position, so that the performance of the acoustic device is stable, and serious distortion is not easy to occur. Moreover, by providing the fiber paper layer 10 on at least one side surface of the vibration plate 100, when the vibration plate 100 is assembled with the vibration film 200, the bonding strength between the vibration plate 100 and the vibration film 200 can be enhanced, and thus the waterproof effect of the product can be enhanced.

Optionally, according to an embodiment of the present invention, the matrix fiber is formed into a three-dimensional mesh structure, the volume of the matrix fiber accounts for 40% -100% of the volume of the fiber paper layer 10, and the reinforcing fiber is doped into the three-dimensional mesh structure to enhance the mechanical strength of the three-dimensional mesh structure, and the volume of the reinforcing fiber accounts for 0-50% of the volume of the fiber paper layer 10; the fiber paper layer 10 further comprises: and a tackifying component, wherein the tackifying component is at least used for bonding the matrix fibers into a whole, and the volume of the tackifying component accounts for 0-40% of the volume of the fiber paper layer 10.

In other words, the fiber paper layer 10 according to the embodiment of the present invention includes the base fiber, which forms a three-dimensional network structure. Optionally, the fiber paper layer 10 further comprises reinforcing fibers and/or tackifying components on the basis of the matrix fibers. Wherein, the volume of the matrix fiber accounts for 40-100% of the total volume of the fiber; the volume of the reinforcing fiber accounts for 0-50% of the total volume of the fiber paper layer 10; the volume of the tackifying component is 0% to 40% of the total volume of the fiber paper layer 10. In the present embodiment, the matrix fiber may function as a basic component of the vibration plate 100, the reinforcing fiber may function as an advantage of reinforcing the mechanical properties of the vibration plate 100, and the tackifying component may function to improve the integrity of the vibration plate 100.

For example, the volume ratio of the matrix fibers, the reinforcing fibers and the tackifying component in the fiber paper layer 10 is 100:0:0, and in this case, the fiber paper layer 10 does not contain the reinforcing fibers and the tackifying component, but is composed of the matrix fibers.

For another example, the volume ratio of matrix fibers, reinforcing fibers, and tackifying components in the fiber paper layer 10 is 50:50:0, where the fiber paper layer 10 includes 50% matrix fibers and 50% reinforcing fibers by volume and does not include tackifying components.

For another example, the volume ratio of matrix fibers, reinforcing fibers, and tackifying component in the fiber paper layer 10 is 60:0:40, where the fiber paper layer 10 includes 60% by volume of matrix fibers and 40% by volume of tackifying component, and does not include reinforcing fibers.

For another example, the fiber-paper layer 10 includes the matrix fiber, the reinforcing fiber and the tackifying component in a ratio of 40:20:40 by volume, and the fiber-paper layer 10 includes the matrix fiber, the reinforcing fiber and the tackifying component in a ratio of 40% by volume.

It should be noted that the component content ratio of the fiber paper layer 10 includes, but is not limited to, the above ratio.

According to one embodiment of the present invention, the base fiber comprises at least one of thermoplastic polymer fiber, natural fiber, inorganic fiber, and the like. That is, the matrix fiber may be manufactured by thermoplastic polymer fiber, natural fiber, inorganic fiber, etc. to form a three-dimensional network structure, which is advantageous in improving modulus and air permeability, while also improving water repellency.

Alternatively, PET, PC, PP, PA, PEI, PEEK, PPS, LCP, PI, aramid fiber, etc. may be used for the thermoplastic polymer fiber.

Alternatively, the natural fibers may be vegetable fibers, animal fibers, or the like.

Alternatively, the inorganic fibers may be glass fibers, carbon fibers, or the like.

Therefore, the matrix fiber can be made of various fibers, and has the advantages of wide material selection and low cost.

When the matrix fiber is thermoplastic polymer fiber, the thermoplastic polymer fiber has the advantage of softening by heating until melting, so that when the matrix fiber is prepared by using the thermoplastic polymer fiber, on one hand, a plurality of fibers can be bonded together by a heating process, and the bonding force among the fibers is increased; on the other hand, the base fiber and the waterproof and breathable layer 20 may be bonded together by a heating process, not only improving the consistency of the vibration plate 100, but also simplifying the manufacturing process.

When the fiber paper layer 10 includes reinforcing fibers, the reinforcing fibers are doped in the matrix fibers, and the volume of the reinforcing fibers is 50% or less of the volume of the fiber paper layer 10.

That is, the reinforcing fibers may be doped between and in contact with the matrix fibers, and may play a reinforcing role due to the high modulus of the reinforcing fibers.

Optionally, the reinforcing fibers are randomly distributed in the matrix fibers in a crisscross manner, so as to play a role in reinforcing the fiber paper layer 10, and enable the fiber paper layer 10 to have higher mechanical strength. That is, the direction of the reinforcing fibers is not limited, and the reinforcing fibers can be randomly distributed among the plurality of base fibers, thereby achieving a reinforcing effect and simplifying the manufacturing process.

In addition, when the content of the reinforcing fibers is low, the reinforcing fibers are randomly distributed in the matrix fibers, and as the number of reinforcing fibers increases, the surface of the reinforcing fibers in contact with the matrix fibers increases. The mechanical properties such as strength of the fiber paper layer 10 increase with increasing reinforcing fiber content. However, when the content of the reinforcing fibers reaches a certain value, the reinforcing fibers are easy to intertwine and not easy to disperse uniformly, no matrix is filled among the reinforcing fibers, crack sources are easy to form, crack expansion is easy to occur in the stress process, and the mechanical properties of the fiber paper layer 10 are easy to influence. Thus, in the present embodiment, when the volume of the reinforcing fiber is 50% or less of the volume of the fiber paper layer 10, not only the reinforcing effect can be exerted on the fiber paper layer 10, but also the dispersion uniformity of the fiber and the mechanical properties of the fiber paper layer 10 can be ensured. For example, the volume of the reinforcing fibers is 50%, 45%, 40%, 35%, 20%, 10% or the like of the volume of the fiber paper layer 10, and by using the reinforcing fibers listed above, it is possible to ensure uniformity of distribution of the reinforcing fibers in the fiber paper layer 10 while also contributing to ensuring strength of the fiber paper layer 10.

According to one embodiment of the invention, the tensile modulus of the reinforcing fiber is equal to or greater than 20GPa. In the present embodiment, when the young's modulus of the reinforcing fiber is not less than 20GPa, the reinforcing fiber has a high modulus, so that the fiber paper layer 10 has a high mechanical strength, and the mechanical strength is also improved for the vibration plate 100 including the reinforcing fiber having the young's modulus of not less than 20GPa. For example, the Young's modulus of the reinforcing fibers is 20GPa, 100GPa, 200GPa, 300GPa, or the like, and the use of the reinforcing fibers as described above is advantageous in ensuring that the vibration plate 100 has good mechanical strength.

Alternatively, the reinforcing fiber may be at least one of carbon fiber, glass fiber and metal fiber, and by using the above type of fiber as the reinforcing fiber, the fiber paper layer 10 can be prepared to have strong mechanical properties.

When the fiber-paper layer 10 includes a tackifying component, the tackifying component may be used at least to bind the matrix fibers together, the tackifying component having a volume of less than or equal to 40% of the volume of the fiber-paper layer 10. If the volume content of the tackifying component is more than 40% of the total volume of the fiber paper layer 10, the tackifying fiber is melted and immersed in the pores during the manufacturing process such as hot pressing, thereby affecting the air permeability. It can be seen that, in the present embodiment, by controlling the volume of the tackifying component to be 40% or less of the volume of the fiber paper layer 10, it is advantageous to ensure not only the integrity of the fiber paper layer 10, but also a sufficient number of matrix fibers and/or reinforcing fibers in the fiber paper layer 10.

Alternatively, the tackifying component may be a low melting point fiber having a melting point less than 150 ℃, a hot melt adhesive, a thermoset adhesive, or the like. For example, the tackifying component is selected from the group consisting of polyolefins, polyester fibers, and the like having a melting point of less than 150 ℃. It can be seen that the tackifying component in this embodiment may be a low melting point tackifying component or an adhesive. In this embodiment, the above-listed tackifying components are used to facilitate melting or reacting during heating, so as to facilitate bonding the plurality of fibers together and further improve the modulus and strength of the fiber paper layer 10.

Alternatively, the fiber paper layer 10 according to the embodiment of the present invention may be manufactured into a felt through wet papermaking, electrostatic spinning, melt spinning, etc., and then formed into a sheet through hot pressing. On the one hand, the hot pressing treatment is performed on the fiber paper layer 10, so that the tackifying component can be activated to play a role of a fiber binder, and the mutually staggered fibers can be fixed, so that the fiber paper layer 10 forms an integral stress structure, and the mechanical properties of the fiber paper layer 10, such as modulus, strength and the like, are improved. On the other hand, the base fibers can be softened and melted, the bonding force between the fibers can be increased, and the fiber paper layer 10 can be formed into an overall stressed structure. In addition, the fiber paper layer 10 can be kept to have a certain porosity while obtaining higher mechanical properties by controlling the temperature and pressure of the hot pressing, which is beneficial to keeping the fiber paper layer 10 breathable.

Alternatively, in the preparation of the vibration plate 100, the fiber paper layer 10 and the waterproof and breathable layer 20 may be bonded by means of thermal compression bonding, pressure-sensitive adhesive, hot-melt web, hot-melt adhesive film, or thermosetting adhesive film. When the fiber paper layer 10 and the waterproof and breathable layer 20 are connected in the above manner, there is an advantage in that it is easy to process. When the hot-pressing or hot-melting net film is adopted for bonding, the bonding consistency of the fiber paper layer 10 and the waterproof breathable layer 20 is good, the adhesive film does not need to be perforated in advance, and the manufacturing process is simple.

According to some embodiments of the present invention, the vibration plate 100 further includes: and an adhesive layer 30, wherein the adhesive layer 30 is arranged between the fiber paper layer 10 and the waterproof breathable layer, and the adhesive layer 30 connects the fiber paper layer 10 and the waterproof breathable layer.

Alternatively, the adhesive layer 30 is provided with a hollow portion 31 penetrating along the thickness direction thereof, and the adhesive layer 30 may be a waterproof backing layer.

It can be understood that the fiber paper layer 10 and the waterproof and breathable layer 20 are connected through the waterproof back adhesive layer, namely, the adhesive is soaked for 30 minutes, and the adhesive force is not invalid, so that the waterproof performance and the adhesive performance can be effectively ensured, and the adhesive of the waterproof back adhesive layer can be selected from the back adhesives of types such as pressure sensitive adhesives, thermosetting adhesives, hot melt adhesives and the like. In an embodiment, the adhesive layer 30 has a hollow pattern in the middle, i.e. a hollow portion 31 is provided, and the hollow portion 31 can meet the airflow requirement and ensure the air permeability of the vibration plate 100.

In some embodiments of the present invention, the fiber paper layer 10 is two layers, and the adhesive layers 30 are respectively disposed between the two sides of the waterproof and breathable layer 20 and the fiber paper layer 10.

In other words, as shown in fig. 2 and 3, in the present embodiment, the vibration plate 100 is composed of two fiber paper layers 10 and two adhesive layers 30, that is, the vibration plate 100 may sequentially include, from bottom to top: the vibration board 100 comprises a fiber paper layer 10, an adhesive layer 30, a waterproof and breathable layer 20, the adhesive layer 30 and the fiber paper layer 10, wherein the fiber paper layer 10 is arranged on the surface layers on two sides of the vibration board 100, the adhesive layer 30 is arranged between each layer of fiber paper layer 10 and the waterproof and breathable layer 20, and hollowed-out parts 31 are arranged on each adhesive layer 30.

Thus, the thickness of the vibration plate 100 can be strictly controlled, the overall strength can be further improved, and the hollow structure on each adhesive layer 30 does not affect the overall air permeability of the vibration plate 100. Moreover, both side surface layers of the vibration plate 100 are all fiber paper layers 10, when the vibration plate 100 is assembled with the vibration film, the vibration plate 100 can be conveniently connected with the vibration film, the vibration film can be connected with the fiber paper layers on one side surface layer or the fiber paper layers on both side surface layers, and the connection strength of the vibration plate 100 and the vibration film is higher.

In some embodiments of the invention, the thickness of each fiber paper layer 10 is greater than or equal to 10 μm. Preferably, the thickness of the fiber paper layer 10 can be controlled between 10 μm and 500 μm.

For the fiber paper layer 10, if the thickness of the fiber paper layer 10 is less than 10 μm, the supporting force of the fiber paper layer 10 is limited; if the thickness of the fiber paper layer 10 is more than 500 μm, the air permeability of the fiber paper layer 10 is made small, and the weight of the resulting vibration plate 100 is large. It can be seen that, in the present embodiment, when the thickness of the single-layer fiber paper layer 10 is 10 μm-500 μm, the fiber paper layer 10 can have a high supporting strength, a high air permeability and a low total weight, so that the vibration plate 100 has good mechanical properties, acoustic properties and light total weight. For example, the thickness of the fiber paper layer 10 is 10 μm, 20 μm, 30 μm, 50 μm, 100 μm, 200 μm, 400 μm, 500 μm, etc., and by using the fiber paper layer 10 of the above thickness, the fiber paper layer 10 is made to have a large supporting property in the vibration plate 100, and also the good air permeability of the vibration plate 100 can be ensured, and the acoustic performance of the sound generating device to which the vibration plate 100 is applied in a high temperature environment can be ensured.

Optionally, the total thickness of the fiber paper layer 10 is greater than the total thickness of the waterproof and breathable layer 20.

That is, whether the number of layers of the fiber paper layer 10 and the waterproof and breathable layer 20 is one or more, it is within the scope of the present invention as long as the total thickness of the fiber paper layer 10 is greater than the total thickness of the waterproof and breathable layer 20.

For example, the single-layer fiber paper layer 10 has a thickness d1, and the single-layer waterproof and breathable layer 20 has a thickness d2.

The relative relationship of the fiber paper layer 10 and the waterproof and breathable layer 20 may include the following:

in the first case, the number of layers of the fiber paper layer 10 is one, and the total thickness of the fiber paper layer 10 is d1; the number of layers of the waterproof and breathable layer 20 is one, and the total thickness of the waterproof and breathable layer 20 is d2. At this time, d1 > d2.

In the second case, the number of layers of the fiber paper layer 10 is one, and the total thickness of the fiber paper layer 10 is d1; the number of layers of the waterproof and breathable layer 20 is N, and the total thickness of the waterproof and breathable layer 20 is N x d2. At this time, d1 > n×d2.

In the third case, the number of layers of the fiber paper layer 10 is multiple, and the total thickness of the fiber paper layer 10 is N x d1; the number of layers of the waterproof and breathable layer 20 is one, and the total thickness of the waterproof and breathable layer 20 is d2. At this time, n×d1 > d2.

In the fourth case, the number of layers of the fiber paper layer 10 is multiple, and the total thickness of the fiber paper layer 10 is N x d1; the number of layers of the waterproof and breathable layer 20 is multiple, and the total thickness of the waterproof and breathable layer 20 is M x d2. At this time, n×d1 > m×d2.

It should be noted that, since the strength and thickness of the vibration plate 100 are related, by limiting that the total thickness of the fiber paper layer 10 is greater than the total thickness of the waterproof and breathable layer 20, the fiber paper layer 10 having a thicker total thickness can not only have a breathable effect, but also have a supporting effect, so that the vibration plate 100 can have a certain strength on the basis of ensuring the breathability of the vibration plate 100, thereby meeting the actual use requirements.

According to some embodiments of the invention, the fibrous paper layer 10 is composed of chopped or continuous fibers having a length > 0.1mm, the chopped or continuous fibers having a diameter distribution between 1 μm and 100 μm.

That is, the fiber paper layer 10 may be made of fibers, which may be chopped fibers or continuous fibers having a length of more than 0.1 mm. When the fibers adopt chopped fibers with the length of more than 0.1mm, the mutual contact area between the fibers is increased along with the increase of the length of the fibers, the bonding strength is improved, and the fibers are not easy to fall off; when the fibers are continuous fibers, the fibers are mutually entangled and are not easy to damage when stressed.

The longer the length of the fiber, the more energy is consumed when the fiber is pulled out. In this embodiment, the fiber paper layer 10 is made of chopped fibers or continuous fibers with a length of > 0.1mm, so that the prepared fiber paper layer 10 has higher young's modulus, tensile strength and the like. For example, the fiber paper layer 10 is composed of chopped fibers or continuous fibers with lengths of 0.2mm, 3mm, 6mm, 10mm, 50mm, etc., the prepared fiber paper layer 10 has high strength, and the vibration plate 100 has good mechanical properties.

In addition, if the diameter of the fiber is less than 1 μm, the strength of the fiber paper layer 10 is easily affected; if the diameter of the fiber is more than 100 μm, the air permeability of the fiber paper layer 10 is easily affected. It can be seen that in this embodiment, the fiber diameter distribution is limited to 1 μm-100 μm, which is advantageous for the fiber paper layer 10 to have good air permeability and supporting strength. For example, the diameters of the fibers are 1 μm, 10 μm, 20 μm, 30 μm, 50 μm, 60 μm, 80 μm, 100 μm, etc., and by using the diameters of the fibers listed above, the air permeability and strength of the vibration plate 100 can be ensured, thereby contributing to the assurance of the acoustic performance and mechanical performance of the sound emitting device.

The present invention also provides a diaphragm assembly including a diaphragm 200 and the diaphragm 100 of any of the above embodiments. Since the vibration plate 100 of the embodiment of the present invention has both waterproof and air-permeable properties and has a high structural strength, the vibration film assembly of the present invention also has the same advantages, and will not be described herein.

According to one embodiment of the present invention, the opposite side surfaces of the vibration plate 100 are provided with the fiber paper layers 10, the vibration plate 100 and the vibration film 200 are integrally injection molded, and part of the vibration film 200 is coated on the peripheral edge of the vibration plate 100; or, a fiber paper layer 10 is provided on one side surface of the vibration plate 100, and the fiber paper layer 10 is connected to an inner fixing portion of the diaphragm 200.

In other words, the diaphragm 100 may have the fiber paper layer 10 on one side surface, or the fiber paper layers 10 on both side surfaces, and when the fiber paper layers 10 are disposed on both opposite sides of the diaphragm 100, part of the diaphragm 200 is wrapped around the periphery of the diaphragm 100, and the bonding strength between the diaphragm and the diaphragm can be increased due to the high bonding strength between the fiber paper layers 10 and the diaphragm 200. When the fiber paper layer 10 is provided at one side of the vibration plate 100, the fiber paper layer 10 may be fixedly connected with the inner ring of the diaphragm 200, so that the bonding strength between the vibration plate and the diaphragm may be ensured.

The diaphragm assembly will be described in detail by taking the example that the opposite sides of the diaphragm 100 are provided with the fiber paper layers 10.

As shown in fig. 1 to 3, in the present embodiment, the diaphragm 100 includes a fiber paper layer 10, an adhesive layer 30, a waterproof and breathable layer 20, an adhesive layer 30, and a fiber paper layer 10 which are laminated in this order, and a diaphragm 200 is integrally injection-molded with the diaphragm 100, and a portion of the diaphragm 200 is coated on opposite sides of the diaphragm 100.

Specifically, the diaphragm 200 is disposed on the outer periphery of the diaphragm 100, the diaphragm 200 may be formed in a hollow ring structure, and the inner ring of the diaphragm 200 is provided with a groove structure for accommodating the diaphragm 100, and the outer side Zhou Sheyu of the diaphragm 100 is disposed in the groove structure.

As shown in fig. 1, the groove structure may be formed by an upper connection piece 201 and a lower connection piece 202 disposed on an inner ring of the diaphragm 200, the upper connection piece 201 and the lower connection piece 202 are spaced apart in an up-down direction to form the groove structure, the upper connection piece 201 covers an outer ring of an upper surface of the diaphragm 100, the lower connection piece 202 covers an outer ring of a lower surface of the diaphragm 100, and the upper connection piece 201 and the lower connection piece 202 are respectively connected with the fiber paper layer 10 on a corresponding side, thereby ensuring a bonding force between the diaphragm 100 and the diaphragm 200.

The sound generating device 300 according to the embodiment of the present invention includes the diaphragm assembly according to the above embodiment, and since the diaphragm assembly according to the embodiment of the present invention has the above technical effects, the sound generating device according to the embodiment of the present invention also has the corresponding technical effects, that is, the vibration plate 100 has good waterproof and air permeability, and has high structural strength, and meanwhile, the bonding strength between the vibration plate and the diaphragm is also high, so that the working requirements can be satisfied.

As shown in fig. 4, according to the structure of the sound generating apparatus 300 when applied to the electronic device 400, the electronic device 400 may be a structure such as a wristwatch, wherein the housing of the electronic device 400 includes an upper case 401 and a lower case 403, and the sound generating apparatus 300 is provided in the housing. The vibrating diaphragm assembly of the sound generating device 300 cooperates with the front cover 301 of the sound generating device 300 to define a front sound cavity 302, the upper shell 401 of the electronic device 400 defines a sound outlet 402 communicated with the front sound cavity 302, the vibrating diaphragm assembly cooperates with the magnetic circuit system 303 and the rear shell 304 of the sound generating device 300 to define a first sound cavity 305, the sound generating device 300 cooperates with the lower shell 403 of the electronic device 400 to define a second sound cavity 404, and the first sound cavity 305 and the second sound cavity 404 are communicated to form a rear sound cavity. The assembly structure and the working principle of the sound generating apparatus 300 and the electronic device 400 according to the embodiment of the present invention are understood and easily implemented by those skilled in the art, and thus will not be described in detail.

Because the vibrating diaphragm assembly according to the embodiment of the invention comprises the vibrating diaphragm 200 and the vibrating plate 100, the communication between the front acoustic cavity 302 and the rear acoustic cavity can be realized through the waterproof and ventilation functions of the vibrating plate 100, the pressure difference between the front acoustic cavity 302 and the rear acoustic cavity can be balanced, the normal vibration of the vibrating diaphragm assembly is ensured, and the acoustic performance of the electronic equipment is ensured.

While certain specific embodiments of the 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 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 (12)

1. A vibration plate, characterized by comprising:

a fiber paper layer and a waterproof and breathable layer which are laminated, wherein the fiber paper layer is at least positioned on one surface layer of the vibrating plate,

the fiber paper layer comprises a three-dimensional net structure at least composed of matrix fibers, wherein the three-dimensional net structure is provided with meshes, and the diameter distribution of the meshes is 0.1-50 mu m.

2. The diaphragm of claim 1 wherein the volume of said matrix fibers is 40% -100% of the volume of said fiber paper layer,

the fiber paper layer further comprises:

reinforcing fibers, wherein the reinforcing fibers are doped in the three-dimensional net structure to strengthen the mechanical strength of the three-dimensional net structure, and the volume of the reinforcing fibers accounts for 0-50% of the volume of the fiber paper layer;

and the tackifying component is at least used for bonding the matrix fibers into a whole, and the volume of the tackifying component accounts for 0-40% of the volume of the fiber paper layer.

3. The vibration plate according to claim 2, wherein the base fiber comprises at least one of thermoplastic polymer fiber, natural fiber, and inorganic fiber;

and/or the reinforcing fibers comprise at least one of carbon fibers, glass fibers, and metal fibers;

and/or the tensile modulus of the reinforcing fiber is more than or equal to 20Gpa;

and/or the tackifying component comprises at least one of a low melting point fiber having a melting point of less than 150 ℃, a hot melt adhesive, and a thermoset adhesive.

4. The vibration plate according to claim 1, characterized by further comprising:

the bonding layer is arranged between the fiber paper layer and the waterproof breathable layer, and the bonding layer is connected with the fiber paper layer and the waterproof breathable layer.

5. The vibration plate according to claim 4, wherein the adhesive layer is provided with a hollowed-out portion penetrating in a thickness direction thereof.

6. The vibration plate according to claim 2, wherein the fiber paper layer is provided in two layers, and the adhesive layers are provided between both sides of the waterproof breathable layer and the fiber paper layer, respectively.

7. The diaphragm of claim 1 wherein each of said layers of fibrous paper has a thickness of 10 μm or more.

8. The diaphragm of claim 1 wherein the total thickness of the fiber paper layer is greater than the total thickness of the waterproof and breathable layer.

9. The vibration plate according to claim 1, characterized in that the fiber paper layer is composed of chopped fibers or continuous fibers having a length > 0.1mm, the diameter of the chopped fibers or the continuous fibers being distributed between 1 μm and 100 μm.

10. A diaphragm assembly comprising a diaphragm and a diaphragm according to any one of claims 1-9.

11. The diaphragm assembly of claim 10, wherein the fiber paper layers are disposed on opposite side surfaces of the diaphragm, the diaphragm and the diaphragm are integrally injection molded, and a portion of the diaphragm is coated on the peripheral edge of the diaphragm;

or, the fiber paper layer is arranged on one side surface of the vibrating plate, and the fiber paper layer is connected with the inner fixing part of the vibrating diaphragm.

12. A sound generating device comprising a diaphragm assembly according to claim 10 or 11.