CN117061960A

CN117061960A - Vibrating plate and preparation method thereof, vibrating diaphragm assembly and sound generating device

Info

Publication number: CN117061960A
Application number: CN202311120857.2A
Authority: CN
Inventors: 刘慧慧; 凌风光; 李春; 张海涛
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2023-11-14

Abstract

The invention provides a vibrating plate and a preparation method thereof, a vibrating diaphragm assembly and a sound generating device. The vibrating plate provided by the invention comprises the fiber paper layer and the hydrophobic layer, so that the vibrating plate has the advantages of air permeability, waterproofness and light weight, can play a good role in waterproofing and balancing the pressure difference between the inner cavities of the sounding device, is waterproof and is not easy to fail, and the waterproof effect of the sounding device is ensured.

Description

Vibrating plate and preparation method thereof, 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 manufacturing method of the 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 have good 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. In addition, after the speaker is through the water pressure process, because the cavity is airtight, air compression, the vibrating diaphragm is to the back acoustic cavity skew, resumes under the normal pressure condition, and gaseous unable exchange, the vibrating diaphragm can't resume balanced position, and the speaker is difficult to normal vibration.

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 invention is to provide a vibrating plate, which can solve the technical problem that the vibrating plate in the prior art is waterproof and easy to fail.

It is still another object of the present invention to provide a method of manufacturing a vibration plate, which can manufacture the above-mentioned vibration plate.

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

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

According to a first aspect of the present invention, there is provided a vibration plate comprising a fiber paper layer having ventilation holes, and a water-repellent layer comprising a first water-repellent portion located on a surface of the fiber paper layer and a second water-repellent portion located on an inner wall surface of the ventilation holes.

Optionally, the ventilation amount of the vibrating plate is more than or equal to 1mL/min/cm ² The method comprises the steps of carrying out a first treatment on the surface of the And/or the hydrostatic pressure resistance of the vibrating plate is more than or equal to 0.01MPa.

Optionally, the binding force between the hydrophobic layer and the fiber paper layer is more than or equal to 3B.

Optionally, the water contact angle of the hydrophobic layer is more than or equal to 90 degrees; and/or the thickness of the hydrophobic layer is 5nm-40 μm; and/or the hydrophobic layer comprises at least one of fluorine-containing, silicon-containing, benzene-containing, polyurethane-containing, polyester-based, polyolefin-based, and rubber-based.

Optionally, the density of the fiber paper layer is less than or equal to 2g/cm ³ The method comprises the steps of carrying out a first treatment on the surface of the And/or the flexural modulus of the fiber paper layer is more than or equal to 5GPa.

Optionally, the fiber paper layer is a three-dimensional mesh structure formed by fibers connected in a disordered way, and the three-dimensional mesh structure is provided with the ventilation pore canal.

Optionally, the pore diameter of the ventilation pore canal is distributed between 0.1 μm and 20 μm; and/or the porosity of the ventilation pore canal is 25% -75%.

Optionally, the fiber paper layer consists of chopped fibers or continuous fibers with a length of > 0.1mm, the diameter of the chopped fibers or the continuous fibers being distributed between 1 μm and 100 μm.

Optionally, the fiber paper layer comprises: the matrix fiber forms a three-dimensional network structure with the ventilation pore canal, and the weight of the matrix fiber accounts for 40% -100% of the weight of the fiber paper layer; reinforcing fibers doped in the three-dimensional network structure to strengthen the mechanical strength of the three-dimensional network structure, wherein the weight of the reinforcing fibers accounts for 0-60% of the weight of the fiber paper layer; and the tackifying component is at least used for bonding the matrix fibers into a whole, and the weight of the tackifying component accounts for 0-40% of the weight of the fiber paper layer.

Optionally, the melting point of the matrix fiber is more than or equal to 100 ℃; and/or the matrix fiber comprises at least one of thermoplastic polymer fiber, natural fiber, and inorganic fiber.

Optionally, the tensile strength of the reinforcing fiber is more than or equal to 500MPa; and/or the reinforcing fibers comprise at least one of carbon fibers, glass fibers, and metal fibers.

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

According to a second aspect of the present invention, there is provided a method of manufacturing a vibration plate, comprising the steps of: and manufacturing the hydrophobic layer on the surface of the fiber paper layer through chemical vapor deposition, physical vapor deposition, plasma deposition, sol-gel method, dip coating, knife coating or spray coating technology.

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

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

The invention has the technical effects that the vibrating plate mainly comprises a fiber paper layer and a hydrophobic layer, and the fiber paper layer is provided with ventilation channels, so that the vibrating plate has ventilation function. The hydrophobic layer includes the first hydrophobic portion that is located the fibre paper layer surface and is located the second hydrophobic portion of ventilative pore canal internal wall face, can make the surface of fibre paper layer and ventilative pore canal all have the hydrophobic function to make the vibration board have ventilative and waterproof effect concurrently. 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 hydrophobic layer, compared with the prior art that holes are punched on the vibrating plate and waterproof and breathable films are attached, the vibrating plate provided by the embodiment of the invention has the advantages of larger breathable area, good consistency, better waterproof effectiveness and stronger structural strength, so that the sounding device applying the vibrating plate has the waterproof performance, the acoustic performance and the mechanical performance.

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 partial cross-sectional view of a vibration plate provided by the present invention;

fig. 2 is a schematic view of the internal structure of a fiber paper layer of the vibration plate provided by the invention;

FIG. 3 is a schematic view of a part of a diaphragm assembly according to the present invention;

fig. 4 is a graph of amplitude versus power reliability test for the products of the examples and comparative examples.

Reference numerals

A vibration plate 100;

a fiber paper layer 10; a base fiber 11; reinforcing fibers 12; a tackifying component 13; ventilation duct 14;

a hydrophobic layer 20; a first water-repellent section 21; a second water-repellent section 22;

and a diaphragm 200.

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.

A vibration plate 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1 to 4, the vibration plate 100 according to the embodiment of the present invention includes a fiber paper layer 10 and a hydrophobic layer 20, the fiber paper layer 10 having ventilation holes 14, the hydrophobic layer 20 including a first hydrophobic portion 21 located at a surface of the fiber paper layer 10 and a second hydrophobic portion 22 located at an inner wall surface of the ventilation holes 14.

In other words, the vibration plate 100 according to the embodiment of the present invention is mainly composed of the fiber paper layer 10 and the hydrophobic layer 20, and the vibration plate 100 has a ventilation function since the fiber paper layer 10 has the ventilation duct 14. 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.

Further, the water-repellent layer 20 includes a first water-repellent section 21 and a second water-repellent section 22, wherein the first water-repellent section 21 is located on the surface of the fiber paper layer 10 and the second water-repellent section 22 is located on the inner wall surface of the air-permeable duct 14.

By making the water-repellent layer 20 include the first water-repellent section 21 and the second water-repellent section 22, on the one hand, the process of bonding the water-repellent layer 20 and the fiber paper layer 10 can be simplified, and the provision of the water-repellent layer 20 on the fiber paper layer 10 can be achieved by, for example, a deposition process or the like, in which the second water-repellent section 22 can be formed on the inner wall surface of the air-permeable duct 14; on the other hand, the first water-repellent part 21 may be provided on the surface of the fiber paper layer 10 to achieve a water-repellent function of the surface of the fiber paper layer 10; in still another aspect, the second water-repellent portion 22 may be disposed on the inner wall surface of the ventilation duct 14, so that the ventilation duct 14 has a ventilation function and also has a water-repellent function. In addition, by disposing the second water-repellent section 22 on the inner surface of the air-permeable duct 14, since the second water-repellent section 22 is a water-repellent material, the capillary effect can be effectively reduced, thereby obtaining better water-repellent performance. 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 invention 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 second water-repellent portion 22 provided on the inner wall surface of the ventilation hole 14 does not clog or affect the ventilation property of the diaphragm 100. That is, since the water-repellent layer 20 covers only the skeletal surface of the fiber paper layer 10, the arrangement of the water-repellent layer 20 has less influence on the pore diameter of the vent hole of the vibration plate 100.

Moreover, since the vibration board 100 of the embodiment of the present invention is composed of the fiber paper layer 10 and the hydrophobic layer 20, the waterproof and breathable requirements of the sound generating device can be solved without providing a waterproof and breathable film 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, thereby meeting the actual use requirements. 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.

Thus, the vibration plate 100 according to the embodiment of the present invention is mainly composed of the fiber paper layer 10 and the hydrophobic layer 20, and the fiber paper layer 10 has the ventilation duct 14, so that the vibration plate 100 has a ventilation function. The hydrophobic layer 20 includes a first hydrophobic portion 21 located on the surface of the fiber paper layer 10 and a second hydrophobic portion 22 located on the inner wall surface of the ventilation duct 14, so that both the surface of the fiber paper layer 10 and the ventilation duct 14 have hydrophobic functions, and the vibration board 100 has ventilation and waterproof effects, and can play a role in well waterproof and balancing the pressure difference between cavities in the sound generating device. 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 matching of the fiber paper layer 10 and the water-repellent layer 20, compared with the prior art that the vibration plate 100 is perforated and the waterproof and breathable film is attached, the vibration plate 100 of the embodiment of the invention 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.

According to one embodiment of the present invention, the ventilation amount of the vibration plate 100 is 1mL/min/cm or more ² The method comprises the steps of carrying out a first treatment on the surface of the And/or, the hydrostatic pressure resistance of the vibration plate 100 is not less than 0.01MPa.

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 The ventilation capability of the vibration plate 100 is easily limited, and the vibration plate 100 needs to be restored to the equilibrium position for a long time, affecting the vibration sound production effect thereof. 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 diaphragm 100 can be quickly returned to the equilibrium position even if it is deviated from the equilibrium position during the expansion of the gas in the acoustic chamber by heat or during the passage of 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 pressure resistance of the vibration plate 100, if the hydrostatic pressure resistance of the vibration plate 100 is less than 0.01MPa, 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 0.01MPa, it is advantageous for the vibration plate 100 to have a higher waterproof level. For example, the hydrostatic pressure resistance of the vibration plate 100 is 0.01MPa, 0.05MPa, 0.1MPa, 0.3MPa, 0.5MPa, 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 having a higher waterproof level and improving the user experience.

In addition, the hydrophobic layer 20 has a large surface contact angle, and water must pass through the hydrophobic layer 20 and the fiber paper layer 10 by external pressure. The hydrostatic pressure resistance can therefore be used to characterize the ability of the diaphragm 100 to resist water pressure. Among them, in the embodiment of the present application, the hydrostatic pressure resistance test may be performed with reference to GB/T4744-2013 using a hydrostatic pressure tester. The magnitude of the hydrostatic pressure reflects the resistance to water penetration into 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. The higher the water pressure, the higher the waterproof level of the test diaphragm. In this embodiment, the anti-hydrostatic pressure capability of the vibration plate 100 is greater than or equal to 0.01MPa, and the vibration plate 100 has a better anti-hydrostatic pressure capability, so that the phenomenon that the speaker leaks water when used in a waterproof test or underwater is ensured.

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 0.01MPa; 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 not less than 0.01MPa.

That is, on the one hand, the ventilation amount of the vibration plate 100 is not less than 1mL/min/cm ² When the sound-producing device is used, the hydrostatic pressure resistance of the vibration plate 100 is not limited, so that the vibration plate 100 can be ensured to quickly return to the balance position when the gas in the sound cavity is heated and expanded and after the water pressure is applied, the specific waterproof grade of the sound-producing device is adjusted by adjusting the hydrostatic pressure resistance of the vibration plate 100, the sound-producing device is applicable to products with low requirements on the waterproof grade and the application environment is mostly high-temperature environments, and the production cost of the sound-producing device is reduced.

On the other hand, when the hydrostatic pressure resistance of the vibration plate 100 is not less than 0.01MPa, the minimum range of the ventilation amount of the vibration plate 100 is not limited on the basis of ensuring ventilation of the vibration plate 100, so that the waterproof grade 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 met, and the production cost of the sound production 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 0.01MPa, 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 a 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 more than or equal to 0.01MPa, so that a user can set the specific ventilation amount and the specific hydrostatic pressure resistance of the vibration plate 100 according to the recovery rate of the vibration plate 100 when the gas in the sound cavity is heated and expanded and after the gas passes through the water pressure and the waterproof grade requirement of the sound generating device, and the flexibility of the sound generating device in the production and preparation processes is improved.

In some embodiments of the present invention, the bonding force of the hydrophobic layer 20 to the fiber paper layer 10 is 3B or more. The bonding force between the fiber paper layer 10 and the hydrophobic layer 20 can be measured by a cross-hatch method and is divided into 0B-5B, and the larger the numerical value is, the better the bonding force is. It can be seen that in this embodiment, by limiting the binding force between the hydrophobic layer 20 and the fiber paper layer 10 to be equal to or greater than 3B, the hydrophobic layer 20 and the fiber paper layer 10 can be ensured to be firmly combined, and the risk of waterproof failure is greatly reduced. For example, the bonding force between the hydrophobic layer 20 and the fiber paper layer 10 is 3B, 4B, 5B, etc., and by adopting the bonding force listed above, the bonding stability between the hydrophobic layer 20 and the fiber paper layer 10 can be ensured, and even if the vibration plate 100 is in water, separation is not easily generated between the hydrophobic layer 20 and the fiber paper layer 10, improving the waterproof reliability.

According to one embodiment of the invention, the water contact angle of the hydrophobic layer 20 is not less than 90 °; and/or the thickness of the hydrophobic layer 20 is between 5nm and 40 μm; and/or the hydrophobic layer 20 contains at least one of fluorine-containing, silicon-containing, benzene-containing, polyurethane-containing, polyester-based, polyolefin-based, rubber-based, and the like.

For the water contact angle of the hydrophobic layer 20, the water contact angle of the hydrophobic layer 20 refers to the contact angle of the hydrophobic layer 20 with water, and the larger the contact angle is, the lower the surface energy is. The material of the water repellent layer 20 is a water repellent material, and has good water repellency. It can be seen that, in the present embodiment, by controlling the water contact angle of the water-repellent layer 20 to be not less than 90 °, liquid water wetting and capillary penetration can be prevented, and excellent hydrophobicity can be provided. For example, the water contact angle of the water-repellent layer 20 is 90 °, 100 °, 115 °, 135 °, or the like, and by adopting the contact angle enumerated above, it is advantageous to ensure good water repellency of the water-repellent layer 20, thereby ensuring the water repellency of the vibration plate 100.

For the thickness of the water-repellent layer 20, if the thickness of the water-repellent layer 20 is too thin, the continuity of the water-repellent layer 20 is poor, so that the water repellency of the water-repellent layer 20 is liable to be insufficient; when the hydrophobic layer 20 is too thick, the internal stress is easily caused to be large, so that the hydrophobic layer 20 is easily detached, and the ventilation effect of the vibration plate 100 is also affected. It can be seen that, in the present embodiment, the thickness of the hydrophobic layer 20 is 5nm to 40 μm, which is advantageous in ensuring the waterproof property of the vibration plate 100 and effectively preventing the waterproof failure. For example, the thickness of the hydrophobic layer 20 is 5nm, 15nm, 30nm, 50nm, 10 μm, 20 μm, 40 μm, etc., and not only the water repellency and the water repellency reliability of the vibration plate 100 can be ensured but also the influence of the larger thickness of the hydrophobic layer 20 on the air permeability of the vibration plate 100 can be avoided by adopting the above-listed hydrophobic layer 20.

As for the preparation material of the hydrophobic layer 20, the hydrophobic layer 20 may contain at least one of fluorine-containing, silicon-containing, benzene-containing, polyurethane-based, polyester-based, polyolefin-based, rubber-based, and the like. By preparing the hydrophobic layer 20 from the above materials, it is possible to ensure good hydrophobicity of the hydrophobic layer 20. In addition, the hydrophobic layer 20 made of the fluorine-containing material has an advantage of good water repellency. The hydrophobic layer 20 of silicon-containing material is easy to bond, is easily and reliably bonded to the fiber paper layer 10, and is environmentally friendly.

In this embodiment, the water contact angle of the hydrophobic layer 20 may be equal to or greater than 90 degrees; or it may be such that the thickness of the hydrophobic layer 20 is between 5nm and 40 μm alone; it is also possible that the hydrophobic layer 20 contains at least one of fluorine-containing, silicon-containing, benzene-containing, polyurethane-containing, polyester-based, polyolefin-based, rubber-based, etc. alone; either any two of the above three conditions are satisfied simultaneously or the above three conditions are satisfied simultaneously, it is obvious that the user can implement flexible adjustment and precise control of the function of the sound generating device by controlling at least one variable condition, which is not described herein.

It follows that in this example, the water contact angle by definition satisfying the hydrophobic layer 20 is ≡90°; the thickness of the hydrophobic layer 20 is between 5nm and 40 μm; the hydrophobic layer 20 contains at least one of fluorine-containing materials, silicon-containing materials, benzene-containing materials, polyurethane-containing materials, polyester-containing materials, polyolefin-containing materials, rubber-containing materials, etc., so that the user can flexibly control the hydrophobicity, air permeability, preparation cost, etc. of the sound-emitting device, respectively, and can meet various requirements of various sound-emitting devices.

In some embodiments of the present invention, the fiber-paper layer 10 has a density of 2g/cm or less ³ The method comprises the steps of carrying out a first treatment on the surface of the And/or the flexural modulus of the fiber paper layer 10 is not less than 5GPa.

Among them, regarding the density of the fiber-paper layer 10, the density of the fiber-paper layer 10 affects the strength of the fiber-paper layer 10 and the quality of the vibration plate 100. The lower the density of the fiber paper layer 10, the lighter the mass of the diaphragm 100 and the better the intermediate frequency sensitivity, but the lower the strength of the diaphragm 100, the more likely the bending deformation occurs. And the excessive density of the fiber paper layer 10 tends to result in a heavy mass of the vibration plate 100, resulting in lower frequency sensitivity of the speaker. It can be seen that in this embodiment, by defining the density of the fibrous paper layer 10 to be 2g/cm or less ³ The vibration plate 100 can be made to have the advantages of light weight, high strength, and the like, so that the sound generating device has light weight, mechanical properties, and acoustic properties. For example, the fiber paper layer 10 has a density of 2g/cm ³ 、1.8g/cm ³ 、1.5g/cm ³ 、1.0g/cm ³ 、0.9g/cm ³ By adopting the above-listed density of the fiber paper layer 10, the fiber paper layer 10 can be ensured to have lighter weight and larger strength, thereby being beneficial to the light weight of the vibration plate 100, and simultaneously having the advantage of high strength, thereby being beneficial to the light weight and good mechanical property of the sound generating device。

The greater the flexural modulus of the fiber paper layer 10, the greater the strength of the diaphragm 100, and the less likely the diaphragm 100 is to be deformed by bending. It can be seen that in this embodiment, by limiting the flexural modulus of the fiber paper layer 10 to 5GPa or more, the strength of the vibration plate 100 can be ensured, thereby improving the mechanical properties of the sound generating apparatus. For example, the flexural modulus of the fiber paper layer 10 is 5GPa, 6GPa, 8GPa, 10GPa, 20GPa, or the like, and the flexural modulus of the fiber paper layer 10 as exemplified above can be used to improve the strength of the fiber paper layer 10, so that the vibration plate 100 is less likely to be deformed by bending.

In the present embodiment, the density of the fiber paper layer 10 may be not more than 2g/cm ³ The method comprises the steps of carrying out a first treatment on the surface of the The bending modulus of the fiber paper layer 10 can be independently more than or equal to 5GPa; it is also possible to satisfy the density of the fiber paper layer 10 less than or equal to 2g/cm ³ The flexural modulus of the fiber paper layer 10 is more than or equal to 5GPa. Therefore, the mechanical property and the total weight of the sound generating device can be flexibly adjusted and controlled by controlling at least one variable condition, and the details are not repeated here.

It can be seen that in this embodiment, by defining the density of the fibrous paper layer 10 to be 2g/cm or less ³ The method comprises the steps of carrying out a first treatment on the surface of the And/or the bending modulus of the fiber paper layer 10 is more than or equal to 5GPa, so that a user can flexibly control the weight, mechanical property and the like of the sounding device respectively, and the requirements of various sounding devices are met.

According to one embodiment of the present invention, the fiber paper layer 10 is a three-dimensional mesh structure composed of fibers connected by disorder, the three-dimensional mesh structure having ventilation holes 14.

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 the three-dimensional net structure has mesh holes, through which the vibration plate 100 can be realized to have a good ventilation function and to reduce water permeability.

In some embodiments of the present invention, the pore size distribution of the ventilation openings 14 is in the range of 0.1 μm to 20 μm; and/or the porosity of the ventilation duct 14 is comprised between 25% and 75%.

Wherein, for pore size distribution of the ventilation duct 14, when the pores of the fiber paper layer 10 are small, the excessively thick hydrophobic layer 20 is liable to form a continuous film layer, thereby affecting ventilation; when the pores of the fiber paper layer 10 are large, the strength of the fiber paper layer 10 is easy to be affected, and if the pore diameter of the fiber paper layer 10 is too large, water drops are easy to directly pass through the meshes, the waterproofness is easy to be affected, and the practical use requirement is difficult to be satisfied. It can be seen that, in the present embodiment, by defining the pore size distribution of the ventilation pore canal 14 to be 0.1 μm-20 μm, the fiber paper layer 10 can be ensured to have good ventilation, the vibration plate 100 can be quickly restored to the equilibrium position, and also has strong strength, and the vibration plate 100 is not easy to bend and deform. For example, the pore diameters of the ventilation holes 14 are 0.1 μm, 1 μm, 5 μm, 8 μm, 10 μm, 15 μm, 20 μm, etc., and the above-listed pore diameters of the ventilation holes 14 are advantageous in that the fiber paper layer 10 has both air permeability and strength, thereby being advantageous in ensuring air permeability and strength of the vibration plate 100, and further being advantageous in that the sound generating device to which the vibration plate 100 is applied has both good mechanical properties and acoustic properties. It should be noted that, in the embodiment of the present invention, the ventilation duct may be not only a circular hole but also a polygonal hole, where when the ventilation duct is a polygonal hole, the aperture of the polygonal hole may be the diameter of an circumscribed circle.

The fiber paper layer 10 will be described below with a minimum pore size of 1 μm as an example.

The pore size of the gas molecules such as water vapor, oxygen, nitrogen, etc. in the air is about 0.0004 μm, and when the minimum pore size of the fiber paper layer 10 is 1 μm, about 250 times of the gas molecules, so that the gas can pass through the fiber paper layer 10 rapidly. And the capillary rain has a diameter of about 500 μm, and since the hydrophobic layer 20 is further provided on the outer side of the fiber paper layer 10, the water leakage phenomenon is not easily generated even if the sound emitting device is in a dense fine rain.

In addition, as for the porosity of the ventilation duct 14, the air permeability of the fiber paper layer 10 is proportional to the porosity, and the larger the porosity, the better the air permeability. If the porosity of the ventilation duct 14 is too large, the strength modulus of the fiber paper layer 10 is easy to be low, and the high-frequency cut-off frequency and the sensitivity of the sound generating device are easy to be affected. If the porosity of the ventilation duct 14 is too small, the ventilation of the fiber paper layer 10 is small, so that it takes a long time for the vibration plate 100 to return to the equilibrium position. It can be seen that, in the present embodiment, the porosity of the ventilation duct 14 is defined to be 25% -75%, which is favorable for ensuring the ventilation and strength of the fiber paper layer 10, so that the vibration board 100 can quickly return to the equilibrium position, is not easy to bend and deform, and is favorable for the sound generating device to have good acoustic performance and mechanical performance. For example, the porosities of the ventilation holes 14 are 25%, 30%, 40%, 45%, 60%, 75%, etc., and the adoption of the porosities of the ventilation holes 14 recited above is advantageous in that the vibration plate 100 has both good ventilation and strength.

In this embodiment, the pore size distribution of the ventilation channels 14 may be 0.1 μm to 20 μm; or can independently satisfy the porosity of the ventilation pore canal 14 to be 25% -75%; it is also possible to satisfy the pore size distribution of the ventilation duct 14 between 0.1 μm and 20 μm, and the porosity of the ventilation duct 14 is between 25% and 75%. Therefore, the mechanical property and the acoustic property of the sound generating device can be flexibly adjusted and controlled by controlling at least one variable condition, and the detailed description is omitted.

It can be seen that in this embodiment, the pore size distribution of the ventilation channels 14 is 0.1 μm to 20 μm; and/or the porosity of the ventilation duct 14 is 25% -75%, so that the user can control the acoustic performance, the mechanical performance and the like of the sound generating device respectively, and the requirements of various sound generating devices are met.

According to one embodiment of the invention, the fibre paper layer 10 consists of chopped or continuous fibres having a length of > 0.1mm, the diameter of which is distributed 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 having lengths of 0.2mm, 3mm, 5mm, 8mm, 10mm, 40mm, etc., and the fiber paper layer 10 is prepared to have 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.

In some embodiments of the present invention, the fiber paper layer 10 comprises matrix fibers 11, reinforcing fibers 12, and a tackifying component 13.

Specifically, the matrix fiber 11 forms a three-dimensional network structure with ventilation holes 14, the weight of the matrix fiber 11 accounts for 40% -100% of the weight of the fiber paper layer 10, the reinforcing fiber 12 is doped in the three-dimensional network structure to strengthen the mechanical strength of the three-dimensional network structure, the weight of the reinforcing fiber 12 accounts for 0% -60% of the weight of the fiber paper layer 10, the tackifying component 13 is at least used for bonding the matrix fiber 11 into a whole, and the weight of the tackifying component 13 accounts for 0% -40% of the weight of the fiber paper layer 10.

That is, the fiber paper layer 10 includes the base fiber 11, and the base fiber 11 may function as a base fiber. The matrix fibers 11 may form a three-dimensional network structure having ventilation channels 14. 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, as for the base fiber 11, the base fiber 11 may function as a basic component of the vibration plate 100.

For the reinforcing fibers 12, 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 serve to advantage in enhancing the mechanical properties of the vibration plate 100. Since the reinforcing fibers 12 have a high modulus, the reinforcing fibers 12 can play a role in reinforcing when being distributed in the matrix fibers 11 in a crisscrossed and random manner, so that the fiber paper layer 10 has a high mechanical strength.

When the content of the reinforcing fibers 12 is low, the reinforcing fibers 12 are randomly distributed in the matrix fibers 11, and the more the number of the reinforcing fibers is, the more the surface is contacted with the matrix fibers 11, and the mechanical properties such as strength of the fiber paper layer 10 are increased with the increase of the content of the reinforcing fibers 12; when the content of the reinforcing fibers 12 reaches a certain value, the reinforcing fibers 12 are mutually entangled and are not easy to disperse uniformly, no matrix is filled among the reinforcing fibers 12, crack sources are easy to generate, and crack expansion easily occurs in the stress process to influence the mechanical properties. It can be seen that, in the present embodiment, by limiting the weight of the reinforcing fibers 12 to 0% -60% of the total weight of the fiber paper layer 10, it is advantageous to ensure the mechanical properties of the vibration plate 100. 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.

In addition, as for the tackifying component 13, the tackifying component 13 serves at least to bond the base fibers 11 into a whole, and the tackifying component 13 can function to improve the integrity of the vibration plate 100.

In the meantime, if the weight content of the tackifying component 13 is too large, the tackifying fiber is melted during the manufacturing process such as hot pressing, and is easily immersed in the pores, thereby easily reducing 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.

The weight ratio of the matrix fibers 11, the reinforcing fibers 12 and the tackifying component 13 in the fiber paper layer 10 is exemplified below.

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.

According to one embodiment of the invention, the melting point of the matrix fiber 11 is greater than or equal to 100 ℃; and/or the base fiber 11 comprises at least one of thermoplastic polymer fiber, natural fiber, and inorganic fiber.

For the melting point of the matrix fiber 11, the melting point of the matrix fiber 11 in this embodiment is greater than or equal to 100 ℃, so that the method is favorable for being applied to hot pressing and other processes, and is not easy to affect the ventilation duct 14 in the hot pressing process. For example, the base fiber 11 has a melting point of 100 ℃, 120 ℃, 150 ℃, 200 ℃, 300 ℃, etc., and the base fiber 11 having the above melting point is used to facilitate the production of the fiber paper layer 10 including the base fiber 11.

For the preparation material of the base fiber 11, the base fiber 11 can be prepared from thermoplastic polymer fibers, natural fibers and inorganic fibers. That is, the base fiber 11 can be manufactured by thermoplastic polymer fibers, natural fibers, inorganic fibers, and the like 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.

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 a thermoplastic polymer fiber, the self-adhesion can be performed by hot pressing, so that the bonding force between the fibers is increased, and the modulus of the fiber paper layer 10 is improved. Also, the higher the heat distortion temperature of the base fiber 11, the better the high temperature resistance of the vibration plate 100, and the better the uniformity of the frequency response curve of the sound generating apparatus when used at different temperatures.

In addition, in the embodiment, the melting point of the matrix fiber 11 is not less than 100 ℃ independently; the condition that the base fiber 11 contains at least one of thermoplastic polymer fiber, natural fiber and inorganic fiber may be satisfied alone; it is also possible to satisfy both conditions. The process for preparing the fiber paper layer 10 can be controlled by selecting the material and the specific melting point of the matrix fiber 11, which is beneficial to preparing the fiber paper layer 10 with good consistency, air permeability and strength.

In some embodiments of the invention, the tensile strength of the reinforcing fibers 12 is greater than or equal to 500MPa; and/or the reinforcing fibers 12 comprise at least one of carbon fibers, glass fibers, metal fibers, and the like.

Wherein, for the tensile strength of the reinforcing fiber 12, the tensile strength of the reinforcing fiber 12 is more than or equal to 500MPa, which is beneficial to ensuring the reinforcing effect of the reinforcing fiber 12 on the vibration plate 100 and improving the mechanical property of the vibration plate 100.

As for the material of the reinforcing fiber 12, at least one of carbon fiber, glass fiber, metal fiber, and the like is used, so that it is advantageous to ensure that the reinforcing fiber 12 has a strong strength and enhance the reinforcing effect on the vibration plate 100.

In this embodiment, the tensile strength of the reinforcing fibers 12 may be not less than 500MPa; it is also possible to satisfy that the reinforcing fibers 12 include at least one of carbon fibers, glass fibers, metal fibers, and the like alone; it is also possible to satisfy both conditions. Flexible control of the mechanical properties of the vibration plate 100 can be achieved by selecting the material of the reinforcing fibers 12, controlling the tensile strength of the reinforcing fibers 12.

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.

According to one embodiment of the present invention, the tackifying component 13 comprises at least one of low melting point fibers having a melting point of less than 150 ℃, hot melt adhesives, and thermoset adhesives. 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 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 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.

The invention also provides a preparation method of the vibration plate 100, which comprises the following steps: the hydrophobic layer 20 is formed on the surface of the fiber paper layer 10 by chemical vapor deposition, physical vapor deposition, plasma deposition, sol-gel method, dip coating, knife coating or spray coating. By adopting the above process, the hydrophobic layer 20 is advantageously formed on the surface of the fiber paper layer 10 and the inner surface of the ventilation duct 14, the formed hydrophobic layer 20 is not liable to affect the ventilation property of the vibration plate 100, and the thickness of the hydrophobic layer 20 is also advantageously controlled to reduce the total weight of the vibration plate 100.

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 property, air permeability and strong structural strength, the vibration film assembly of the present invention also has the same advantages, and will not be described herein.

According to an embodiment of the present invention, as shown in fig. 3, a diaphragm 200 is wrapped around the outer circumference of a 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 hydrophobic 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 arranging the fiber paper layer 10 to be connected with 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 coupled to the inner fixing portion of the diaphragm 200, the diaphragm 200 may be bonded to the diaphragm 100 through the adhesive 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 invention 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 invention 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 invention are described in detail below with reference to the specific embodiments.

Examples

On the surface of the fiber paper layer 10 having a thickness of 140 μm, a silicone hydrophobic layer having a thickness of 100nm was obtained by physical vapor deposition, and the vibration plate 100 was obtained.

The fiber paper layer 10 is prepared from matrix fibers 11 and reinforcing fibers 12, specifically, the matrix fibers 11 are PET fibers, and the weight ratio of the PET fibers is 70%; the reinforcing fiber 12 is obtained by uniformly mixing carbon fiber and PET fiber, specifically, the weight ratio of the carbon fiber is 28%; the remainder of the fiber paper layer 10 is PE hot melt adhesive.

Comparative example

And (3) punching holes on the surface of the PET film by adopting the PET film with the thickness of 140 mu m to obtain a PET vibrating plate, and attaching a polytetrafluoroethylene film with the thickness of 20 mu m on the PET vibrating plate.

The diaphragm 100 of the embodiment and the PET diaphragm of the comparative example were die-cut to the same shape, and were integrally injection-molded with liquid silicone rubber to form diaphragm assemblies, respectively, and assembled into a speaker, i.e., a sound generating device. Wherein the diaphragm assembly of the comparative example further comprises a waterproof breathable film attached thereto. The assembled speakers were each tested for acoustic performance and the resulting performance data are shown in table 1 below.

TABLE 1 Performance index

As can be seen from table 1, the vibration plate 100 of the embodiment has a fiber paper layer 10 as a main body, and a large number of pores are contained therein, so that the vibration plate 100 has a small density and a lighter weight. And the vibration plate 100 of the embodiment contains high-strength carbon fibers as the reinforcing fibers 12, and thus has higher mechanical properties.

Since the vibration plate 100 in the embodiment does not need to be attached with a waterproof and breathable film, the thickness of the hydrophobic layer 20 is only a few hundred nanometers, so that the influence on the thickness of the vibration plate 100 is small, and the vibration space is saved.

The vibration plate 100 of the embodiment is breathable except for the positions where the ring is adhered and the voice coil is adhered, so that the breathable area is much larger than that of the comparative example, and the breathable amount is much larger than that of the comparative example.

In addition, the diaphragm assemblies of the examples and the comparative examples can meet the water pressure test of 0.1MPa, which is equivalent to 10 m water resistance. The test process may be a hydrostatic pressure resistance test process adopted in the embodiment of the present application, that is, the hydrostatic pressure resistance test may refer to GB/T4744-2013, and the test is performed using a hydrostatic pressure tester.

Next, after the sound emitting devices obtained by assembling the examples and the comparative examples were subjected to high-power reliability tests, the amplitudes of the sound emitting devices were compared with each other.

As shown in FIG. 4, the sound generating device of the embodiment has good symmetry of upper and lower vibration, the maximum amplitude of the upper vibration is 0.34mm, the maximum amplitude of the lower vibration is 0.33mm, and the sound generating device of the comparative example has large difference of the upper and lower vibration, the maximum amplitude of the upper vibration is 0.28mm, and the maximum amplitude of the lower vibration is 0.4mm.

Therefore, the vibration plate 100 of the embodiment has air permeability, the temperature of the rear sound cavity rises and air expands in the process of high-power reliability of the loudspeaker, and the expanded air can pass through the vibration plate 100 of the embodiment, so that the air pressure of the front cavity and the rear cavity is balanced, the vibration film 200 is always at the balance position, and the amplitude symmetry is good.

In contrast, the PET vibration plate of the comparative example has a small ventilation area, a low ventilation amount, and an insufficient effect of equalizing the air pressure, although having a ventilation effect.

In summary, the vibration board 100 according to the embodiment of the present invention combines the fiber paper layer 10 and the hydrophobic layer 20, the fiber paper layer 10 has the ventilation duct 14, the hydrophobic layer 20 includes the first hydrophobic portion 21 located on the surface of the fiber paper layer 10 and the second hydrophobic portion 22 located on the inner wall surface of the ventilation duct 14, and the obtained vibration board 100 has not only ventilation effect and waterproof effect, but also good consistency, can effectively avoid waterproof failure, and has the advantage of greater structural strength.

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

1. The vibration board is characterized by comprising a fiber paper layer and a hydrophobic layer, wherein the fiber paper layer is provided with a ventilation pore canal, and the hydrophobic layer comprises a first hydrophobic part positioned on the surface of the fiber paper layer and a second hydrophobic part positioned on the inner wall surface of the ventilation pore canal.

2. 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 0.01MPa.

3. The vibration plate according to claim 1, wherein the bonding force of the hydrophobic layer and the fiber paper layer is not less than 3B.

4. The vibration plate according to claim 1, wherein the water contact angle of the hydrophobic layer is not less than 90 °;

and/or the thickness of the hydrophobic layer is 5nm-40 μm;

And/or the hydrophobic layer comprises at least one of fluorine-containing, silicon-containing, benzene-containing, polyurethane-containing, polyester-based, polyolefin-based, and rubber-based.

5. The vibration plate according to claim 1, wherein the density of the fiber paper layer is 2g/cm or less ³ ；

And/or the flexural modulus of the fiber paper layer is more than or equal to 5GPa.

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, the three-dimensional net structure having the ventilation duct.

7. The vibration plate according to claim 1, wherein the pore size distribution of the ventilation pore is 0.1 μm to 20 μm;

and/or the porosity of the ventilation pore canal is 25% -75%.

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

9. The diaphragm of claim 1 wherein the fiber paper layer comprises:

the matrix fiber forms a three-dimensional network structure with the ventilation pore canal, and the weight of the matrix fiber accounts for 40% -100% of the weight of the fiber paper layer;

Reinforcing fibers doped in the three-dimensional network structure to strengthen the mechanical strength of the three-dimensional network structure, wherein the weight of the reinforcing fibers accounts for 0-60% of the weight of the fiber paper layer;

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

10. The vibration plate according to claim 9, wherein the melting point of the matrix fiber is not less than 100 ℃;

and/or the matrix fiber comprises at least one of thermoplastic polymer fiber, natural fiber, and inorganic fiber.

11. The vibration plate according to claim 9, wherein the tensile strength of the reinforcing fiber is not less than 500MPa;

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

12. The vibration plate of claim 9, wherein the adhesion promoting component comprises at least one of a low melting fiber having a melting point of less than 150 ℃, a hot melt adhesive, and a thermosetting adhesive.

13. A method of manufacturing a vibration plate according to any one of claims 1 to 12, comprising the steps of:

And manufacturing the hydrophobic layer on the surface of the fiber paper layer through chemical vapor deposition, physical vapor deposition, plasma deposition, sol-gel method, dip coating, knife coating or spray coating technology.

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

15. A sound generating apparatus comprising the diaphragm assembly of claim 14.