CN220629573U

CN220629573U - Vibrating plate, vibrating diaphragm assembly and sound generating device

Info

Publication number: CN220629573U
Application number: CN202322368593.4U
Authority: CN
Inventors: 刘慧慧; 李春; 凌风光; 张海涛
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2024-03-19
Anticipated expiration: 2033-08-31

Abstract

The utility model provides a vibrating plate, a vibrating diaphragm assembly and a sound generating device, wherein the vibrating plate comprises at least one fiber paper layer and at least one waterproof and breathable layer, the total thickness of the fiber paper layer is larger than that of the waterproof and breathable layer, and the fiber paper layer and the waterproof and breathable layer are provided with ventilation holes which are communicated. The vibrating plate provided by the utility model comprises at least one fiber paper layer and at least one waterproof and breathable layer, so that the vibrating plate has air permeability and waterproofness, can play a good role in waterproof and balancing the pressure difference between cavities in the sounding device, is waterproof and not easy to fail, and ensures the waterproof effect of the sounding device.

Description

Vibrating plate, vibrating diaphragm assembly and sound generating device

Technical Field

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

Background

With the development of wearable devices, the requirement for the waterproof function of speakers is becoming higher and higher. In order to achieve good waterproof performance, a speaker module and a monomer are required to be good in tightness. However, in the use process of the loudspeaker, the temperature is continuously increased, the gas is heated and expanded, the vibrating diaphragm deviates from the balance position, the performance of the loudspeaker is changed, and the distortion is serious. On the other hand, after the loudspeaker is subjected to the water pressure process, the cavity is closed, the air is compressed, the vibrating diaphragm deviates from the back acoustic cavity, the air cannot be exchanged under the condition of recovering to normal pressure, the vibrating diaphragm cannot recover to the balance position, and the loudspeaker is difficult to vibrate normally.

At present, a waterproof and breathable film is arranged on a vibrating plate or a shell to solve the waterproof and breathable requirements. The scheme can realize the waterproof and breathable effects, but the manufacturing process is complex, the adhesive layer is required to be adhered, and when the adhesive layer has defects or is opened, the risk of waterproof failure exists. And paste waterproof ventilated membrane after the vibrating plate trompil, can reduce the modulus and the intensity of vibrating plate for the vibrating plate can't satisfy actual user demand.

Disclosure of Invention

An object of the present utility model is to provide a vibration plate, which can at least solve the technical problem that the vibration plate in the prior art is easy to fail in waterproof.

The utility model further provides a vibrating diaphragm assembly with the vibrating plate.

The utility model also provides a sound generating device with the vibrating diaphragm assembly.

According to a first aspect of the present utility model, there is provided a vibration plate comprising at least one fibrous paper layer and at least one waterproof and breathable layer, the fibrous paper layer having a total thickness greater than the total thickness of the waterproof and breathable layer, the fibrous paper layer and the waterproof and breathable layer having ventilation holes in communication.

Optionally, the thickness of the single layer of the waterproof and breathable layer is between 5 μm and 100 μm, and/or the thickness of the single layer of the fiber paper layer is between 10 μm and 500 μm.

Optionally, the ventilation amount of the vibrating plate is more than or equal to 1mL/min/cm ² And/or the vibrationThe hydrostatic pressure resistance of the movable plate is more than or equal to 10KPa.

Optionally, the ventilation quantity of the waterproof ventilation layer is more than or equal to 2mL/min/cm ² And/or, the contact angle of the waterproof breathable layer is more than or equal to 90 degrees.

Optionally, the waterproof and breathable layer is located on the outermost layer of the vibration plate; or the number of the fiber paper layers is multiple, and the waterproof breathable layer is positioned between two fiber paper layers.

Optionally, the fiber paper layer is a three-dimensional net structure formed by fibers connected in a disordered way, and the pore diameter of the mesh of the fiber paper layer is distributed between 0.1 μm and 100 μm.

Alternatively, the fibrous paper layer is composed of chopped or continuous fibers having a length of > 0.1mm, the diameter of the chopped or continuous fibers being distributed between 1 μm and 100 μm.

Optionally, the fiber paper layer includes: the matrix fiber forms a three-dimensional network structure, and comprises at least one of thermoplastic polymer fiber, natural fiber and inorganic fiber.

Optionally, the fiber paper layer further comprises: reinforcing fibers, the reinforcing fibers being doped in the matrix fibers, the weight of the reinforcing fibers being less than or equal to 60% of the weight of the fiber paper layer.

Optionally, the Young's modulus of the reinforcing fiber is more than or equal to 10GPa.

Optionally, the fiber paper layer further comprises: a tackifying component at least for bonding the base fibers together, the tackifying component having a weight of less than or equal to 40% of the weight of the fiber paper layer.

According to a second aspect of the present utility model, there is provided a diaphragm assembly comprising a diaphragm and any one of the diaphragms described above.

Optionally, the vibrating diaphragm is wrapped on the outer periphery of the vibrating plate; or the fiber paper layer is connected with the inner fixing part of the vibrating diaphragm.

According to a third aspect of the present utility model, there is provided a sound generating apparatus comprising a diaphragm assembly as described in any one of the above.

The utility model has the technical effects that the vibrating plate combines at least one fiber paper layer and at least one waterproof and breathable layer, and the fiber paper layer and the waterproof and breathable layer are provided with the communicated air holes, so that the vibrating plate has both the ventilation function and the waterproof function. And the total thickness of the fiber paper layer is larger than that of the waterproof breathable layer, so that the structural strength of the vibration board also meets the use requirement on the basis of having the breathable function and the waterproof function. Because the vibrating plate has ventilation function, even if 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. And even the sound generating device is after the hydraulic pressure process, the vibration board also can be restored to the equilibrium position for sound generating device can normally work. In addition, through adopting the cooperation of the fiber paper layer and the waterproof breathable layer, compared with the prior scheme of punching holes on the vibrating plate and attaching the waterproof breathable film, the vibrating plate provided by the embodiment of the utility model has the advantages of larger breathable area, good consistency and better waterproof effectiveness, so that the sounding device applying the vibrating plate has the waterproof performance, the acoustic performance and the mechanical performance, and simultaneously, the vibrating plate can be ensured to have higher structural strength.

Other features of the present utility model and its advantages will become apparent from the following detailed description of exemplary embodiments of the utility model, 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 utility model and together with the description, serve to explain the principles of the utility model.

FIG. 1 is a partial cross-sectional view of a vibration plate of one embodiment of the present utility model;

FIG. 2 is a partial cross-sectional view of a vibration plate of one embodiment of the present utility model;

FIG. 3 is a partial cross-sectional view of a vibration plate of one embodiment of the present utility model;

FIG. 4 is a partial cross-sectional view of a vibration plate of one embodiment of the present utility model;

FIG. 5 is a partial cross-sectional view of a vibration plate of one embodiment of the present utility model;

FIG. 6 is an internal schematic view of a fiber paper layer of a vibration plate according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a portion of a diaphragm assembly according to an embodiment of the present utility model;

FIG. 8 is a graph comparing THD curves of the sound emitting device of example 1 before and after testing;

fig. 9 is a graph comparing THD curves of the sound generating apparatus of comparative example 1 before and after the test.

Reference numerals

A vibration plate 100;

a fiber paper layer 10; a base fiber 11; reinforcing fibers 12; a tackifying component 13;

a waterproof breathable layer 20;

a glue layer 30;

and a diaphragm 200.

Detailed Description

Various exemplary embodiments of the present utility model 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 utility model 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 utility model, 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.

Hereinafter, the vibration plate 100 according to the embodiment of the present utility model will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 9, the vibration plate 100 according to the embodiment of the present utility model includes at least one fiber paper layer 10 and at least one waterproof and breathable layer 20, the total thickness of the fiber paper layer 10 is greater than the total thickness of the waterproof and breathable layer 20, and the fiber paper layer 10 and the waterproof and breathable layer 20 have ventilation holes in communication.

In other words, the vibration plate 100 according to the embodiment of the present utility model is mainly composed 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, and may be one or more; similarly, the number of layers of the waterproof and breathable layer 20 may be one or more, and is not limited thereto.

Among them, since the fiber paper layer 10 and the waterproof and breathable layer 20 have ventilation holes in communication, the vibration plate 100 has a ventilation function. Since the vibration plate 100 has a ventilation function, even when the gas in the acoustic cavity expands due to heat, the vibration plate 100 is not easily deviated from the equilibrium position, so that the performance of the acoustic device is stable, and serious distortion is not easily caused. The diaphragm 100 also has a waterproof function because the waterproof breathable layer 20 also has a waterproof effect. Even if the sound emitting device is subjected to the water pressure process, the vibration plate 100 can be restored to the equilibrium position so that the sound emitting device can normally operate. That is, the vibration plate 100 of the embodiment of the present utility model has both air permeability and water resistance, and can play a role in well water resistance and balancing the pressure difference between the cavities in the sound emitting device. The ventilation holes in the embodiment of the utility model can be not only circular holes but also polygonal holes, wherein when the ventilation holes are polygonal holes, the aperture of the polygonal holes can be the diameter of an circumscribed circle.

In addition, 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 are one or more, it is within the scope of the present utility model 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.

Optionally, when the modulus of the waterproof and breathable layer 20 in the embodiment of the present utility model is lower and the modulus of the fiber paper layer 10 is higher, the thickness of the waterproof and breathable layer 20 can be controlled to be as thin as possible on the premise of meeting the waterproof property, so that the speaker is facilitated to obtain a better frequency response curve.

Moreover, since the vibration board 100 of the embodiment of the present utility model is composed of the fiber paper layer 10 and the waterproof and breathable layer 20, the waterproof and breathable film is not required to be arranged on the vibration board 100 or the housing of the sound generating device, so that the waterproof and breathable requirements of the sound generating device can be solved, and the structural strength of the vibration board also meets the use requirements. It can be seen that the vibration plate 100 of the embodiment of the present utility model not only can achieve waterproof and ventilation effects, but also has the advantage of effectively preventing waterproof failure, and can play a role in well preventing water and balancing the pressure difference between the cavities in the sound generating device. In addition, the vibration plate 100 of the embodiment of the utility model 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 utility model is applied to a sound generating device, the waterproof effect, waterproof stability, air permeability and structural strength of the sound generating device can be ensured.

Thus, the vibration plate 100 according to the embodiment of the present utility model adopts at least one fiber paper layer 10 and at least one waterproof and breathable layer 20 in combination, and the fiber paper layer 10 and the waterproof and breathable layer 20 have ventilation holes communicated with each other, so that the vibration plate 100 has both ventilation function and waterproof function. And the total thickness of the fiber paper layer 10 is greater than that of the waterproof and breathable layer 20, so that the structural strength of the vibration plate 100 also satisfies the use requirement on the basis of having a breathable function and a waterproof function. Since the vibration plate 100 has a ventilation function, even if the gas in the acoustic cavity expands due to heat, the vibration plate 100 is not easily deviated from the equilibrium position, so that the performance of the sound generating apparatus is stable, and serious distortion is not easily caused. And, even if the sound emitting device is subjected to a water pressure process, the vibration plate 100 can be restored to the equilibrium position so that the sound emitting device can normally operate. In addition, by adopting the combination of the fiber paper layer 10 and the waterproof breathable layer 20, compared with the prior art that the waterproof breathable film is perforated and attached to the vibration plate 100, the vibration plate 100 of the embodiment of the utility model has larger breathable area, good consistency and better waterproof effectiveness, so that the sound generating device applying the vibration plate 100 has both waterproof performance and acoustic performance as well as mechanical performance, and simultaneously, the vibration plate 100 can also have higher structural strength.

According to one embodiment of the utility model, the thickness of the single-layer waterproof and breathable layer 20 is between 5 μm and 100 μm, and/or the thickness of the single-layer fibrous paper layer 10 is between 10 μm and 500 μm.

Among them, the waterproof and breathable layer 20 is generally obtained through different stretching ratios of a blank material at the time of preparation, and it can be seen that the thinner the thickness thereof, the more the porous structure is, and the better the breathability is, but the waterproof property of the waterproof and breathable layer 20 is affected, and the corresponding breathability is reduced to some extent when the thickness of the waterproof and breathable layer 20 is too thick. Therefore, in the present embodiment, when the thickness of the single-layer waterproof and breathable layer 20 is 5 μm to 100 μm, the waterproof and breathable layer 20 can be made to have both superior breathability and waterproofness. Alternatively, the thickness of the single-layer waterproof and breathable layer 20 is 5 μm, 10 μm, 15 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm or 100 μm, etc., and by adopting the waterproof and breathable layer 20 with the thickness, the waterproof and breathable layer 20 has good air permeability and good waterproof performance, thereby being beneficial to the good air permeability and waterproof performance of the vibration plate 100 and further being beneficial to the sound-producing device with the vibration plate 100.

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 adopting the fiber paper layer 10 with the thickness, the fiber paper layer 10 plays a large supporting role in the vibration plate 100, and also ensures good air permeability of the vibration plate 100 and ensures acoustic performance of the sound generating device when the gas in the acoustic cavity is expanded by heating.

In this embodiment, the thickness of the single-layer waterproof and breathable layer 20 may be 5 μm to 100 μm; or can be independently satisfied that the thickness of the single-layer fiber paper layer 10 is 10 μm-500 μm; it is also possible to satisfy the thickness of the single-layer waterproof and breathable layer 20 between 5 μm and 100 μm and the thickness of the single-layer fiber paper layer 10 between 10 μm and 500 μm.

That is, on the one hand, when the thickness of the single-layer waterproof and breathable layer 20 is satisfied independently to be 5 μm to 100 μm, the thickness of the single-layer fiber paper layer 10 may not be limited, so that the strength and breathability of the vibration plate 100 can be adjusted by controlling the thickness of the fiber paper layer 10 on the basis of controlling the waterproofness of the manufactured vibration plate 100.

On the other hand, when the thickness of the single-layer fiber paper layer 10 is independently satisfied to be 10 μm to 500 μm, the thickness of the single-layer waterproof and breathable layer 20 may not be limited, so that the adjustment of the waterproof property of the vibration plate 100 and the further fine adjustment of the air permeability of the vibration plate 100 may be facilitated by adjusting the thickness of the waterproof and breathable layer 20 on the basis of controlling the air permeability and strength of the manufactured vibration plate 100.

On the other hand, when the thickness of the single-layer waterproof and breathable layer 20 is 5 μm to 100 μm and the thickness of the single-layer fiber paper layer 10 is 10 μm to 500 μm, the prepared vibration plate 100 can have good air permeability, waterproof property and high strength.

It can be seen that, in this embodiment, by defining the thickness of the single-layer waterproof and breathable layer 20 to be 5 μm-100 μm, and/or the thickness of the single-layer fiber paper layer 10 to be 10 μm-500 μm, the waterproof and breathable properties of the waterproof and breathable layer 20 can be flexibly controlled through a plurality of angles, which is beneficial to producing sound-emitting device products with different requirements, improving flexibility, and facilitating control of production costs.

In some embodiments of the present utility model, the ventilation amount of the vibration plate 100 is 1mL/min/cm or more ² And/or the hydrostatic pressure resistance of the vibration plate 100 is not less than 10KPa.

Wherein, for the ventilation amount of the vibration plate 100, if the ventilation amount of the vibration plate 100 is less than 1mL/min/cm ² Easily enable ventilation of the vibration plate 100The force is limited and the vibration plate 100 needs to be restored to the equilibrium position for a long time, affecting its vibration sound effect. As can be seen, in the present embodiment, by limiting the ventilation amount of the vibration plate 100 to 1mL/min/cm or more ² The vibration plate 100 can be quickly restored to the equilibrium position even if it is deviated from the equilibrium position in an environment where the temperature is high or during the water pressure. For example, the air permeability of the vibration plate 100 is 1mL/min/cm ² 、5mL/min/cm ² 、10mL/min/cm ² 、100mL/min/cm ² 、1000mL/min/cm ² And the like, by adopting the vibrating plate 100 with the ventilation quantity listed above, the vibrating plate 100 can be effectively ensured to quickly return to the balance position when the gas in the sound cavity is heated and expanded and after the gas is subjected to water pressure, so that the sound generating device using the vibrating plate 100 is favorable for having good acoustic performance.

As for the hydrostatic resistance of the vibration plate 100, if the hydrostatic resistance of the vibration plate 100 is less than 10KPa, the waterproof level of the vibration plate 100 is liable to be limited. It can be seen that, in the present embodiment, by limiting the hydrostatic pressure resistance of the vibration plate 100 to be equal to or greater than 10KPa, it is advantageous for the vibration plate 100 to have a higher waterproof level. For example, the hydrostatic resistance of the vibration plate 100 is 10KPa, 15KPa, 20KPa, 40KPa, 50KPa, etc., so that the waterproof level of the vibration plate 100 is effectively improved, thereby being beneficial to the sound generating device using the vibration plate 100 to have a higher waterproof level and improving the user experience.

In the present embodiment, the ventilation amount of the vibration plate 100 may be 1mL/min/cm or more ² The method comprises the steps of carrying out a first treatment on the surface of the Or can independently meet the requirement that the hydrostatic pressure resistance of the vibration plate 100 is more than or equal to 10KPa; or can simultaneously meet the ventilation quantity of the vibration plate 100 not less than 1mL/min/cm ² The hydrostatic pressure resistance of the vibration plate 100 is equal to or greater than 10KPa.

That is, on the one hand, the ventilation amount of the vibration plate 100 is not less than 1mL/min/cm ² In this case, the hydrostatic pressure resistance of the vibration plate 100 may not be limited, so that the vibration plate 100 may be ensured to be capable of quickly returning to the equilibrium position when the gas in the acoustic cavity is expanded by heating and after the hydrostatic pressure, and the specific waterproof level of the sound-producing device may be adjusted by adjusting the hydrostatic pressure resistance of the vibration plate 100The waterproof device is used for products with low waterproof grade requirements and application environments of high-temperature environments, and is favorable for reducing the production cost of the sounding device.

On the other hand, when the hydrostatic pressure resistance of the vibration plate 100 is not less than 10KPa, the minimum range of the ventilation of the vibration plate 100 is not limited on the basis of ensuring ventilation of the vibration plate 100, so that the waterproof level of the vibration plate 100 can be improved on the basis of ensuring that the vibration plate 100 can return to the balance position, some products with higher requirements on the waterproof effect and lower requirements on the return rate of the vibration plate 100 can be satisfied, and the production cost of the sounding device is reduced.

On the other hand, the ventilation amount of the vibration plate 100 is not less than 1mL/min/cm ² When the hydrostatic pressure resistance of the vibration plate 100 is more than or equal to 10KPa, the vibration plate 100 can be quickly restored to the balance position when the gas in the acoustic cavity is heated and expanded and after the water pressure is passed, and the vibration plate 100 can have higher waterproof grade.

As can be seen from the above, in the present embodiment, the ventilation amount of the vibration plate 100 is not less than 1mL/min/cm ² And/or, the hydrostatic pressure resistance of the vibration plate 100 is not less than 10KPa, and the user can set the specific ventilation amount and the specific hydrostatic pressure resistance of the vibration plate 100 through a plurality of angles according to the recovery rate of the vibration plate 100 when the gas in the sound cavity is heated and expanded and after the water pressure is passed through and the waterproof grade requirement of the sound generating device, so that the flexibility of the sound generating device in the production and preparation processes is improved.

According to one embodiment of the utility model, the air permeability of the waterproof air permeable layer 20 is equal to or more than 2mL/min/cm ² And/or the contact angle of the waterproof and breathable layer 20 is more than or equal to 90 degrees.

Wherein, for the air permeability of the waterproof air-permeable layer 20, if the air permeability of the waterproof air-permeable layer 20 is less than 2mL/min/cm ² The overall ventilation of the vibration plate 100 is easily affected, so that the vibration plate 100 needs a long time to return to the equilibrium position when the gas in the acoustic cavity is expanded by heat and after water pressure. As can be seen, in this example, the air permeability by defining the waterproof air permeable layer 20 was not less than 2mL/min/cm ² The waterproof breathable layer 20 can be made to have good waterproof properties while also being capable of improving the overall breathability of the vibration plate 100. For example, the air permeability of the waterproof and breathable layer 20 is 2mL/min/cm ² 、20mL/min/cm ² 、200mL/min/cm ² 、500mL/min/cm ² 、1000mL/min/cm ² And the like, by adopting the waterproof breathable layer 20 with the breathable amount listed above, the vibration plate 100 can be ensured to quickly return to the balance position, and the sound generating device is favorable for still having good acoustic performance when the gas in the sound cavity is heated and expanded and after water pressure.

The contact angle of the waterproof and breathable layer 20 is the contact angle between the waterproof and breathable layer 20 and water, and the larger the contact angle is, the lower the surface energy is. In this embodiment, since the contact angle of the waterproof and breathable layer 20 is equal to or greater than 90 °, the waterproof and breathable layer 20 in this embodiment has good hydrophobicity, which is beneficial to preventing external water from entering the inside of the vibration plate 100 through the waterproof and breathable layer 20. For example, the contact angle of the waterproof and breathable layer 20 is 90 °, 110 °, 130 °, 150 °, or the like, and by adopting the contact angle enumerated above, it is advantageous to ensure good hydrophobicity of the waterproof and breathable layer 20, thereby ensuring the waterproof property of the vibration plate 100.

In this embodiment, the air permeability of the waterproof and air permeable layer 20 may be not less than 2mL/min/cm ² The method comprises the steps of carrying out a first treatment on the surface of the Or the contact angle of the waterproof and breathable layer 20 is more than or equal to 90 degrees; or can simultaneously meet the requirement that the ventilation capacity of the waterproof ventilation layer 20 is more than or equal to 2mL/min/cm ² The contact angle of the waterproof breathable layer 20 is more than or equal to 90 degrees.

That is, on the one hand, the air permeability of the waterproof air-permeable layer 20 is not less than 2mL/min/cm ² In this case, the contact angle of the waterproof and breathable layer 20 may not be limited, and thus the hydrophobic performance of the vibration plate 100 may be adjusted by controlling the contact angle of the waterproof and breathable layer 20 on the basis of controlling a large air permeability of the waterproof and breathable layer 20.

On the other hand, when the contact angle of the waterproof and breathable layer 20 is satisfied independently at 90 ° or more, the specific degree of breathability of the waterproof and breathable layer 20 can be designed while the hydrophobicity of the waterproof and breathable layer 20 is improved.

In still another aspect, the air permeability of the waterproof air permeable layer 20 is more than or equal to 2mL/min/cm ² When the contact angle of the waterproof and breathable layer 20 is equal to or more than 90 degrees, the waterproof and breathable layer 20 can be ensured to have good air permeability and hydrophobicity, so that the vibration plate 100 has both air permeability and water resistance.

As can be seen from this, in this example, the air permeability by limiting the waterproof air permeable layer 20 was not less than 2mL/min/cm ² And/or, the contact angle of the waterproof and breathable layer 20 is more than or equal to 90 degrees, and a user can respectively control the ventilation amount and the contact angle of the waterproof and breathable layer 20 through a plurality of angles, so that the requirements of various sound generating devices are met.

Alternatively, the waterproof and breathable layer 20 may be a fluorine-containing film, a silicon-containing film, a polyolefin film, a polyester film, a polyurethane film, or the like. By adopting the waterproof and breathable layer 20 made of the material, the waterproof and breathable layer 20 can be ensured to have good air permeability and waterproof effect.

In some embodiments of the present utility model, the waterproof and breathable layer 20 is located at the outermost layer of the vibration plate 100; or, the number of the fiber paper layers 10 is multiple, and the waterproof and breathable layer 20 is positioned between the two fiber paper layers 10. In the present utility model, the inner side of the vibration plate 100 means a side close to the acoustic cavity, and the outer side means a side close to the outside.

It should be noted that, in the present embodiment, the relative positional relationship between the waterproof and breathable layer 20 and the fiber paper layer 10 includes, but is not limited to, the following distribution cases:

distribution case one

The waterproof and breathable layer 20 is located at the outermost layer of the vibration plate 100, that is, the waterproof and breathable layer 20 is located at the outer side surface of the vibration plate 100. For example, as shown in fig. 1 and 2, the vibration plate 100 includes a layer of fiber paper 10 and a layer of waterproof and breathable layer 20 that are stacked, wherein the layer of waterproof and breathable layer 20 is located at the outermost surface of the vibration plate 100. As another example, as shown in fig. 4, the vibration plate 100 includes two fiber paper layers 10 and a single waterproof and breathable layer 20, and for convenience of explanation, the two fiber paper layers 10 may be defined as a first fiber paper layer and a second fiber paper layer, and the vibration plate 100 may include the first fiber paper layer, the second fiber paper layer, and the waterproof and breathable layer 20 stacked in this order, with the waterproof and breathable layer 20 being located at the outermost surface of the vibration plate 100.

When the waterproof and breathable layer 20 is located on the outermost surface of the vibration plate 100, external water can be effectively blocked outside the product, the fiber paper layer 10 is protected, the fiber paper layer 10 is prevented from absorbing water, and normal operation of the sound generating device can be ensured.

Distribution case two

The number of the fiber paper layers 10 is plural, and as shown in fig. 3, the waterproof and breathable layer 20 is located between the two fiber paper layers 10, that is, the waterproof and breathable layer 20 is located inside the vibration plate 100.

For example, the vibration plate 100 includes two fiber paper layers 10 and one waterproof and breathable layer 20, and for convenience of explanation, the two fiber paper layers 10 may be defined as a first fiber paper layer and a second fiber paper layer, and the vibration plate 100 may include the first fiber paper layer, the waterproof and breathable layer 20, and the second fiber paper layer, which are sequentially stacked, with the waterproof and breathable layer 20 being located between the first fiber paper layer and the second fiber paper layer.

As another example, as shown in fig. 5, the vibration plate 100 includes three fiber paper layers 10 and two waterproof and breathable layers 20, and for convenience of explanation, the three fiber paper layers 10 may be defined as a first fiber paper layer, a second fiber paper layer, and a third fiber paper layer, the two waterproof and breathable layers 20 may be defined as a first waterproof and breathable layer, and the vibration plate 100 may include a first fiber paper layer, a first waterproof and breathable layer, a second fiber paper layer, a second waterproof and breathable layer, and a third fiber paper layer that are sequentially stacked, that is, the first waterproof and breathable layer is located between the first fiber paper layer and the second fiber paper layer, and the second waterproof and breathable layer is located between the second fiber paper layer and the third fiber paper layer.

For another example, the vibration plate 100 includes four fiber paper layers 10 and one waterproof and breathable layer 20, and for convenience of explanation, the four fiber paper layers 10 may be defined as a first fiber paper layer, a second fiber paper layer, a third fiber paper layer, and a fourth fiber paper layer 10, and the vibration plate 100 includes the first fiber paper layer, the second fiber paper layer, the waterproof and breathable layer 20, the third fiber paper layer, and the fourth fiber paper layer 10 that are sequentially stacked, with the waterproof and breathable layer 20 being located at the second fiber paper layer and the third fiber paper layer.

Distribution case three

The number of the fiber paper layers 10 and the waterproof and breathable layers 20 is respectively multiple, wherein one waterproof and breathable layer 20 is positioned on the outer surface of the vibration plate 100, and the other waterproof and breathable layer 20 is positioned inside the vibration plate 100.

For example, the vibration plate 100 includes two fiber paper layers 10 and two waterproof and breathable layers 20, and for convenience of explanation, the two fiber paper layers 10 may be defined as a first fiber paper layer and a second fiber paper layer, and the two waterproof and breathable layers 20 may be defined as a first waterproof and breathable layer and a second waterproof and breathable layer, and at this time, the vibration plate 100 may include a first waterproof and breathable layer, a first fiber paper layer, a second waterproof and breathable layer, and a second fiber paper layer, which are sequentially stacked, and at this time, the first waterproof and breathable layer is positioned between the first fiber paper layer and the second fiber paper layer.

It can be seen that, in the present embodiment, it is not only limited that the waterproof and breathable layer 20 is located at the outermost layer of the vibration plate 100, which is beneficial to blocking external water from entering the inner side of the vibration plate 100; the waterproof and breathable layer 20 may be disposed between the two fiber paper layers 10, and it is possible to ensure a certain waterproof property on the outside of the diaphragm 100 by controlling the water absorption rate of the fiber paper layers 10, or the like, and when the water absorption rate of the fiber paper layers 10 is not limited, the waterproof and breathable layer 20 may be disposed inside, so that external water can be prevented from further entering the inside of the diaphragm 100 after passing through the fiber paper layers 10.

Alternatively, when the vibration plate 100 includes a plurality of fiber paper layers 10, the fiber paper layers 10 of different layers may be made of the same material, which has an advantage of easy manufacturing; the plurality of fiber paper layers 10 may be made of different materials, which is advantageous in that the vibration plate 100 has various functions.

According to one embodiment of the present utility model, the fiber paper layer 10 is a three-dimensional net structure composed of fibers connected by disorder, and the pore size distribution of the mesh of the fiber paper layer 10 is 0.1 μm-100 μm.

That is, in the present embodiment, the fiber paper layer 10 may be composed of randomly connected 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 pore size distribution of the mesh is 0.1 μm to 100 μm, and by the mesh within the pore size distribution range, the fiber paper layer 10 can be ensured to have good air permeability and support. If the pore size 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 pore size distribution of the mesh is more than 100 μm, the supportability of the fiber paper layer 10 is easily made low, so that the strength of the vibration plate 100 is low, and it is difficult to satisfy the actual use requirement. For example, the mesh holes of the fiber paper layer 10 have a pore diameter of 0.1 μm, 10 μm, 30 μm, 50 μm, 60 μm, 80 μm, 100 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.

In some embodiments of the utility model, the fibrous paper layer 10 is composed of chopped or continuous fibers having a length of > 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 chopped fibers with the length of more than 0.1mm are adopted as the fibers, the mutual contact area of the diameters of the fibers is increased along with the increase of the lengths 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 too small, not only is it difficult to manufacture, but also the smaller the diameter of the fiber, the smaller the pores formed by interlacing with each other, and the smaller the air permeability. If the fiber diameter is too large, the pore diameter is too large and the strength is low. 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.

According to one embodiment of the utility model, the fibre paper layer 10 comprises matrix fibres 11 forming a three-dimensional network structure.

Optionally, the fibre paper layer 10 further comprises reinforcing fibres 12 and/or a tackifying component 13 on the basis of the matrix fibres 11. Wherein, the weight of the matrix fiber 11 accounts for 40% -100% of the total weight of the fiber paper layer 10; the weight of the reinforcing fibers 12 accounts for 0% -60% of the total weight of the fiber paper layer 10; the weight of the tackifying component 13 is 0% -40% of the total weight of the fiber paper layer 10. In the present embodiment, the base fiber 11 may function as a basic component of the vibration plate 100, the reinforcing fiber 12 may function as an advantage of reinforcing the mechanical properties of the vibration plate 100, and the tackifying component 13 may function to improve the integrity of the vibration plate 100.

For example, the weight ratio of the matrix fibers 11, the reinforcing fibers 12 and the tackifying component 13 in the fiber paper layer 10 is 100:0:0, and at this time, the fiber paper layer 10 does not contain the reinforcing fibers 12 and the tackifying component 13, but is composed of the matrix fibers 11.

For another example, the weight ratio of the matrix fibers 11, the reinforcing fibers 12, and the tackifying component 13 in the fiber paper layer 10 is 40:60:0, and the fiber paper layer 10 contains 40% by weight of the matrix fibers 11 and 60% by weight of the reinforcing fibers 12, and does not contain the tackifying component 13.

For another example, the weight ratio of the matrix fibers 11, the reinforcing fibers 12, and the tackifying component 13 in the fiber paper layer 10 is 60:0:40, and the fiber paper layer 10 contains 60% by weight of the matrix fibers 11 and 40% of the tackifying component 13, and does not contain the reinforcing fibers 12.

For another example, the weight ratio of the matrix fibers 11, the reinforcing fibers 12, and the tackifying component 13 in the fiber paper layer 10 is 40:20:40, and the fiber paper layer 10 includes 40% by weight of the matrix fibers 11, 20% of the reinforcing fibers 12, and 40% of the tackifying component 13.

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

Wherein for the base fiber 11, the base fiber 11 can form a three-dimensional network structure, which is advantageous for improving modulus and air permeability and also improving water resistance. The base fiber 11 may contain at least one of thermoplastic polymer fibers, natural fibers, inorganic fibers, and the like. That is, the base fiber 11 may be manufactured by thermoplastic polymer fibers, natural fibers, inorganic fibers, and the like to form a three-dimensional network structure.

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.

It can be seen that the base fiber 11 can be made of various kinds of fibers, and has the advantages of wide material selection and low cost.

When the matrix fiber 11 is made of thermoplastic polymer fiber, the thermoplastic polymer fiber is softened by heating until it is melted, so that when the matrix fiber 11 is made of thermoplastic polymer fiber, on one hand, a plurality of fibers can be bonded together by heating process to increase the bonding force between the fibers; on the other hand, the base fiber 11 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.

For the reinforcing fibers, the reinforcing fibers 12 may be doped in the matrix fibers 11, and the weight of the reinforcing fibers 12 is 60% or less of the weight of the fiber paper layer 10. That is, the reinforcing fibers 12 may be doped between the base fibers 11 and in contact with the base fibers 11, and the reinforcing fibers 12 may play a reinforcing role because the reinforcing fibers 12 have a high modulus.

Optionally, the reinforcing fibers 12 are randomly distributed in the matrix fibers 11 in a crisscross manner, which plays a role in reinforcing the fiber paper layer 10, so that the fiber paper layer 10 has higher mechanical strength. That is, the direction of the reinforcing fibers 12 is not limited, and the reinforcing fibers 12 may be randomly distributed among the plurality of base fibers 11, so that the reinforcing effect can be achieved, and the effect of simplifying the manufacturing process can be achieved.

Further, when the content of the reinforcing fibers 12 is low, the reinforcing fibers 12 are randomly distributed in the matrix fibers 11, and as the number of the reinforcing fibers 12 increases, the surface thereof in contact with the matrix fibers 11 increases. The strength and other mechanical properties of the fiber-paper layer 10 increase with increasing content of reinforcing fibers 12. However, when the content of the reinforcing fibers 12 reaches a certain value, the reinforcing fibers 12 are easy to be entangled with each other, are not easy to be uniformly dispersed, and are not filled with a matrix, so that crack sources are easy to form, crack propagation is easy to occur in the stress process, and the mechanical properties of the fiber paper layer 10 are easy to be affected. Thus, in the present embodiment, when the weight of the reinforcing fiber 12 is 60% or less of the weight 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 reinforcing fibers 12 have a weight of 60%, 55%, 50%, 40%, 20%, 10% or the like of the weight of the fiber paper layer 10, and by using the reinforcing fibers 12 listed above, it is possible to ensure uniformity of distribution of the reinforcing fibers 12 in the fiber paper layer 10 while also contributing to ensuring strength of the fiber paper layer 10.

According to one embodiment of the utility model, the Young's modulus of the reinforcing fibers 12 is 10GPa or more. That is, the tensile modulus of the reinforcing fiber 12 is 10GPa or more. In the present embodiment, when the young's modulus of the reinforcing fiber 12 is not less than 10GPa, the reinforcing fiber 12 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 12 having the young's modulus of not less than 10GPa. For example, the Young's modulus of the reinforcing fiber 12 is 10GPa, 100GPa, 200GPa, 300GPa, or the like, and the use of the reinforcing fiber 12 as described above is advantageous in ensuring that the vibration plate 100 has good mechanical strength.

Alternatively, the reinforcing fibers 12 may be carbon fibers, glass fibers, metal fibers, etc., and by using the above-mentioned types of fibers as the reinforcing fibers 12, the fiber paper layer 10 can be produced with high mechanical properties.

As for the tackifying component 13, the tackifying component 13 is at least used to bond the base fibers 11 into a whole, and the weight of the tackifying component 13 is 40% or less of the weight of the fiber paper layer 10. If the weight content of the tackifying component 13 is more than 40% of the total weight 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 reducing the air permeability of the vibration plate 100 and affecting the air permeability of the vibration plate 100. It can be seen that, in the present embodiment, by controlling the weight of the tackifying component 13 to be 40% or less of the weight 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 11 and/or reinforcing fibers 12 in the fiber paper layer 10.

Alternatively, the tackifying component 13 may be a low melting point fiber having a melting point of less than 150 ℃, a hot melt adhesive, a thermoset, or the like. For example, polyolefin, polyester fiber, etc. with melting point lower than 150 deg.c is used as the tackifying component 13. It can be seen that the tackifying component 13 in this embodiment may be a low melting point tackifying component or an adhesive. In this embodiment, the above-listed tackifying component 13 is used, so that the tackifying component 13 can be easily melted or reacted in the heating process, thereby facilitating the bonding of a plurality of fibers into a whole and further improving the modulus and strength of the fiber paper layer 10.

Alternatively, the fiber paper layer 10 according to the embodiment of the present utility model 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 13 can be activated to act as 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 such as modulus, strength and the like of the fiber paper layer 10 are improved. On the other hand, the base fibers 11 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 stress 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, as shown in fig. 2 to 4, the fiber paper layer 10 and the waterproof and breathable layer 20 may be bonded by means of thermal compression bonding, pressure-sensitive adhesive, a hot-melt web, a hot-melt adhesive film, or a 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.

The present utility model 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 utility model has both waterproof and air-permeable properties, the vibration film assembly of the present utility model has the same advantages, and will not be described herein.

According to an embodiment of the present utility model, as shown in fig. 7, the diaphragm 200 is wrapped around the outer circumference of the vibration plate 100; or, the fiber paper layer 10 is connected to an inner fixing portion of the diaphragm 200. That is, in the present embodiment, the diaphragm 200 and the vibration plate 100 may be fixed in various ways. Wherein, when the diaphragm 200 wraps the outer periphery of the vibration plate 100, it is beneficial to enlarge the sealing area between the diaphragm 200 and the vibration plate 100, and improve the waterproof effect of the diaphragm assembly. When the fiber paper layer 10 is connected with the inner fixing part of the diaphragm 200, the connection strength of the vibration plate 100 and the diaphragm 200 can be enhanced, and the waterproof sealing effect of the diaphragm assembly is improved. It can be understood that, since the connection strength between the waterproof and breathable layer 20 and the diaphragm 200 is not high, cracking is easy to occur, so that the waterproof effect of the diaphragm assembly is affected, and therefore, the connection strength between the diaphragm 100 and the diaphragm 200 can be enhanced by providing the fiber paper layer 10 to be connected to the inner fixing portion of the diaphragm 200.

Alternatively, when the diaphragm 200 is wrapped around the outer periphery of the diaphragm 100, the diaphragm 200 and the diaphragm 100 may be manufactured by an integral injection molding process, and the diaphragm 200 may be manufactured by using liquid rubber. When the integral molding process is adopted, the integration and waterproof sealing effect of the diaphragm 200 and the vibration plate 100 are improved.

Alternatively, when the fiber paper layer 10 is connected to the inner fixing portion of the diaphragm 200, as shown in fig. 1 or 5, the diaphragm 200 may be bonded to the vibration plate 100 by a glue layer 30 such as an adhesive tape or glue. When the bonding mode is adopted, the process is simplified, and the assembly efficiency is improved.

Optionally, when the diaphragm 200 is wrapped around the outer periphery of the diaphragm 100, a sealing area may be disposed around the outer periphery of the diaphragm 100, where it should be noted that if the sealing area is greater than 50mm, the air permeability of the diaphragm assembly is easily affected, and if the sealing area is less than 0.1mm, the sealing area is too narrow, and the tightness and the water resistance of the diaphragm assembly are easily affected. It can be seen that, in this embodiment, the sealing area with the width of 0.1mm-50mm is adopted, so that the air permeability of the diaphragm assembly and the waterproof performance of the diaphragm assembly are guaranteed.

The utility model also provides a sound generating device which comprises the vibrating diaphragm assembly of any embodiment. Because the vibrating diaphragm assembly of the embodiment of the utility model has good waterproofness and air permeability, the sound generating device can still have good acoustic performance when the air in the sound cavity is heated and expanded and after the air is subjected to water pressure, and details are omitted here.

The diaphragm assembly and the sound generating device according to the embodiments of the present utility model are described in detail below with reference to the specific embodiments.

Example 1

The vibration plate 100 is prepared by laminating a fiber paper layer 10 and a waterproof and breathable layer 20. Wherein, the fiber paper layer 10 is composed of 70% by weight of matrix fiber 11 and 30% by weight of reinforcing fiber 12. The matrix fiber 11 is selected from PP fiber, and the reinforcing fiber 12 is selected from carbon fiber. And the thickness of the fiber paper layer 10 was 100 μm.

The waterproof and breathable layer 20 is made of expanded polytetrafluoroethylene film. The waterproof and breathable layer 20 has a thickness of 20. Mu.m.

Example 2

The vibration plate 100 is prepared by two fiber paper layers 10 and one waterproof and breathable layer 20, and a PE hot melt web is used for connection between the fiber paper layers 10 and the waterproof and breathable layer 20.

For convenience of explanation, the two fiber paper layers 10 are defined as a first fiber paper layer and a second fiber paper layer, respectively. In embodiment 2, the structure of the vibration plate 100 is: the first fiber paper layer, the first PE hot-melt net film, the waterproof breathable layer 20, the second PE hot-melt net film and the second fiber paper layer are stacked.

Wherein the first fiber paper layer comprises 50% of PP fiber, 40% of carbon fiber and 10% of PE fiber, and the thickness of the first fiber paper layer is 50 μm. The thickness of the first PE hot-melt net film and the second PE hot-melt net film is 20 mu m respectively. The waterproof and breathable layer 20 is made of a expanded polytetrafluoroethylene film with a thickness of 15 μm.

In addition, the second fiber paper layer contains 50% by weight of PP fibers, 40% by weight of carbon fibers, and 10% by weight of PE fibers. The thickness of the second fiber paper layer was 50 μm.

In example 2, the thickness of the fiber paper layer 10 was 100 μm as the sum of the thicknesses of the first fiber paper layer and the second fiber paper layer. The waterproof and breathable layer 20 has a thickness of 50 μm. The total thickness of the fiber paper layer 10 is greater than the total thickness of the waterproof and breathable layer 20.

Example 3

The vibration plate 100 is prepared by three fiber paper layers 10 and two waterproof and breathable layers 20, and for convenience of explanation, the three fiber paper layers 10 are defined as a first fiber paper layer, a second fiber paper layer, and a third fiber paper layer, respectively, and the two waterproof and breathable layers 20 are defined as a first waterproof and breathable layer and a second waterproof and breathable layer. In embodiment 3, the structure of the vibration plate 100 is: the first fiber paper layer, the first waterproof and breathable layer, the second fiber paper layer, the second waterproof and breathable layer and the third fiber paper layer are stacked.

The first fiber paper layer comprises 55% of PEI fiber, 40% of carbon fiber and 5% of PE hot melt adhesive powder, and the thickness of the first fiber paper layer is 50 μm.

The second fiber paper layer is composed of 50% by weight of PP fibers, 40% by weight of carbon fibers and 10% by weight of PE fibers, and the thickness of the second fiber paper layer is 100 μm.

The third fiber paper layer is composed of PEI fiber accounting for 55% by weight, carbon fiber accounting for 40% by weight and PE hot melt adhesive powder accounting for 5% by weight, and the thickness of the third fiber paper layer is 50 μm.

The first waterproof and breathable layer and the second waterproof and breathable layer are made of expanded polytetrafluoroethylene films, and the thickness of the first waterproof and breathable layer and the second waterproof and breathable layer is 15 mu m.

Comparative example 1

PEI vibration plates were prepared using a Polyetherimide (PEI) film having a thickness of 100. Mu.m.

The air permeability and the water repellency of the vibration plates 100 prepared in example 1, example 2, example 3 and the PEI vibration plates prepared in comparative example 1 were tested as follows.

The vibration plates 100 prepared in example 1, example 2, example 3 and the vibration plate prepared in comparative example 1 each satisfy the hydrostatic pressure resistance of 0.5MPa, i.e., the vibration plates in example and comparative example each satisfy the 50m waterproofing test. Among them, hydrostatic pressure resistance test is referred to GB/T4744-2013, and a hydrostatic pressure tester is used for testing.

Wherein, the magnitude of the hydrostatic pressure reflects the resistance of water penetration to the inside of the test diaphragm. One side of the test diaphragm is subjected to a gradually increasing water pressure until 3 parts of the other side of the test diaphragm are penetrated by water, and the water pressure value at the moment is recorded.

In addition, the ventilation amount of the test diaphragm was measured under a pressure of 7KPa, and the ventilation amount of the diaphragm 100 of example 1 was 320mL/min/cm ² The air permeability of the vibration plate 100 of example 2 was 230mL/min/cm ² The air permeability of the vibration plate 100 of example 3 was 182mL/min/cm ² The PEI vibration plate of comparative example 1 had a ventilation of 0.2mL/min/cm ² . As can be seen from this, the vibration plate 100 of each of embodiments 1 to 3 has a waterproof and breathable function. The PEI vibration plate of comparative example 1 has a waterproof function, but is substantially airtight because the film has a dense structure.

Next, the diaphragm assembly was assembled from the diaphragm 100 produced in example 1 and the PEI diaphragm produced in comparative example 1, respectively, with the same liquid silicone rubber prepared with the same thickness and external dimensions, and the speaker was assembled.

The distortion curves of the two speakers before and after the high temperature and high humidity experiment at 85 ℃ under 85% RH and 168h are respectively compared, as shown in fig. 8 and 9, the vibration plate 100 of the embodiment 1 has air permeability, the THD change is not obvious before and after the experiment, the rise is less than 1%, the PEI vibration plate of the comparative example 1 has no air permeability, the THD change is large before and after the experiment, the pressure rise caused by the air expansion of the rear cavity in the process of the experiment cannot be balanced, and the PEI vibration plate is in an unbalanced position after the experiment, so the distortion is obviously raised.

In summary, according to the vibration plate 100, the vibration film assembly and the sound generating device of the embodiment of the utility model, due to the breathability and the waterproofness, the vibration plate 100 can return to the equilibrium position when the gas in the sound cavity is heated and expanded or after the water pressure is passed, so that the acoustic performance and the waterproof performance of the sound generating device are ensured, the effects of good waterproof and balancing the pressure difference in the cavity of the sound generating device can be achieved, the waterproof is not easy to fail, and the waterproof effect of the sound generating device is ensured.

While certain specific embodiments of the utility model 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 utility model. 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 utility model. The scope of the utility model is defined by the appended claims.

Claims

1. The utility model provides a vibrating plate which characterized in that includes at least one deck fibre ply and at least one deck waterproof ventilative layer, the total thickness of fibre ply is greater than the total thickness of waterproof ventilative layer, fibre ply with waterproof ventilative layer has the bleeder vent that is linked together.

2. The vibration plate according to claim 1, wherein a thickness of the single-layer waterproof and breathable layer is 5 μm to 100 μm, and/or a thickness of the single-layer fiber paper layer is 10 μm to 500 μm.

3. The vibration plate according to claim 1, wherein the ventilation amount of the vibration plate is 1mL/min/cm or more ² And/or the hydrostatic pressure resistance of the vibrating plate is more than or equal to 10KPa.

4. The vibration plate according to claim 1, wherein the waterproof and breathable layer has a breathable content of 2mL/min/cm or more ² And/or, the contact angle of the waterproof breathable layer is more than or equal to 90 degrees.

5. The vibration plate according to claim 1, wherein the waterproof and breathable layer is located at an outermost layer of the vibration plate;

or the number of the fiber paper layers is multiple, and the waterproof breathable layer is positioned between two fiber paper layers.

6. The vibration plate according to claim 1, wherein the fiber paper layer is a three-dimensional net structure composed of fibers connected by disorder, and the pore size distribution of the meshes of the fiber paper layer is 0.1 μm to 100 μm.

7. 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.

8. The diaphragm of claim 1 wherein the fiber paper layer comprises: the matrix fiber forms a three-dimensional network structure, and comprises at least one of thermoplastic polymer fiber, natural fiber and inorganic fiber.

9. The diaphragm of claim 8 wherein the fiber paper layer further comprises: reinforcing fibers, the reinforcing fibers being doped in the matrix fibers, the weight of the reinforcing fibers being less than or equal to 60% of the weight of the fiber paper layer.

10. The vibration plate according to claim 9, wherein the young's modulus of the reinforcing fiber is 10GPa or more.

11. The vibration plate according to claim 8 or 9, wherein the fiber paper layer further comprises: a tackifying component at least for bonding the base fibers together, the tackifying component having a weight of less than or equal to 40% of the weight of the fiber paper layer.

12. A diaphragm assembly comprising a diaphragm and a diaphragm according to any one of claims 1 to 11.

13. The diaphragm assembly of claim 12, wherein the diaphragm is wrapped around an outer periphery of the diaphragm;

Or the fiber paper layer is connected with the inner fixing part of the vibrating diaphragm.

14. A sound generating device comprising a diaphragm assembly according to claim 12 or 13.