Vibration plate, diaphragm assembly, sound production device and electronic device

Abstract

The application discloses a vibrating plate, a vibrating diaphragm assembly, a sound generating device and electronic equipment, and relates to the field of acoustics. The vibrating plate is applied to the sound generating device. The vibrating plate comprises a foamed metal layer and a hydrophobic layer. The foamed metal layer has air permeable holes. The hydrophobic layer covers at least part of the surface layer of the foamed metal layer and at least part of the inner wall of the air permeable holes. The air permeability of the vibrating plate is greater than or equal to 1ml / (cm 2 ·min)@7kPa. According to the vibrating plate, better waterproofness and better acoustic performance can be achieved, which is beneficial to meeting the actual needs of the sound generating device for the waterproofness, air permeability, heat dissipation and high modulus of the vibrating plate, so that the sound generating device can always maintain excellent acoustic performance during use.

Description

Technical Field

[0001] This invention relates to the field of acoustics, specifically to a vibrating plate, a diaphragm assembly, a sound-generating device, and an electronic device. Background Technology

[0002] Sound-generating devices are increasingly used in daily life. As users utilize them in various scenarios, stricter requirements are being placed on their waterproof performance to prevent damage or malfunction upon contact with water. To achieve good waterproofing, the sound-generating device module and individual units must be well-sealed. However, during use, as the temperature rises, the heat inside the device cannot be effectively dissipated in time. The gas expands due to heat, causing the diaphragm to deviate from its equilibrium position, altering the device's performance and resulting in severe distortion. Furthermore, after being subjected to water pressure, the sealed cavity and compressed air cause the diaphragm to shift backward within the sound cavity. Upon returning to normal pressure, gas exchange is impossible, preventing the diaphragm from returning to its equilibrium position. This hinders normal vibration and severely impacts the sound output.

[0003] Currently, waterproofing and breathability can be achieved by making holes in the casing or vibrating plate of the terminal device and attaching a waterproof and breathable membrane to the holes. However, the above-mentioned hole-making method still has waterproofing risks, and making holes in the vibrating plate will also reduce its modulus and strength, thereby affecting the high-frequency performance of the sound-generating device. Summary of the Invention

[0004] The main objective of this invention is to provide a vibrating plate, a diaphragm assembly, a sound-generating device, and an electronic device, aiming to solve the problem that the vibrating plate of existing sound-generating devices cannot simultaneously meet the requirements of waterproof performance and acoustic performance.

[0005] To achieve the above objectives, the present invention provides a vibrating plate applied to a sound-generating device. The vibrating plate comprises a foamed metal layer and a hydrophobic layer, the foamed metal layer having air-permeable channels; the hydrophobic layer covers at least a portion of the surface layer of the foamed metal layer and at least a portion of the inner wall of the air-permeable channels; the air permeability of the vibrating plate is greater than or equal to 1 ml / (cm²). 2 ·min)@7kPa.

[0006] Optionally, the hydrophobic layer includes at least one of fluorine-containing polymer materials, silicon-containing polymer materials, benzene-containing polymer materials, polyurethane polymer materials, polyester polymer materials, polyolefin polymer materials, and rubber polymer materials.

[0007] Optionally, the hydrophobic layer includes a high thermal radiation filler, wherein the thermal radiation coefficient of the high thermal radiation filler is greater than 0.7, and the high thermal radiation filler includes at least one of carbon black, graphene, carbon nanotubes, silicon carbide, alumina, iron oxide, and copper oxide.

[0008] Optionally, the high thermal radiation filler accounts for 5%-50% of the mass of the hydrophobic layer.

[0009] Optionally, the thickness of the hydrophobic layer is 5 nm-40 μm;

[0010] And / or, the water droplet angle of the hydrophobic layer is greater than or equal to 90°.

[0011] Optionally, the pore size of the venting channel is 0.1-2 mm;

[0012] And / or, the porosity of the foamed metal layer is 40%-95%;

[0013] And / or, the pore density of the foamed metal layer is 5-100 PPi.

[0014] Optionally, the effective thermal conductivity of the foamed metal layer is greater than or equal to 1 W / (m·K).

[0015] Optionally, the foam metal layer includes at least one of foam copper, foam nickel, foam aluminum, foam iron-nickel alloy, and foam copper-nickel alloy.

[0016] Optionally, the vibrating plate has a hydrostatic pressure resistance greater than or equal to 0.01 MPa;

[0017] And / or, the bonding force between the hydrophobic layer and the foam metal layer is greater than or equal to 3B.

[0018] Optionally, the hydrophobic layer is processed by at least one of chemical vapor deposition, physical vapor deposition, plasma deposition, sol-gel method, dip coating, blade coating and spray coating.

[0019] The present invention also provides a diaphragm assembly applied to a sound-generating device, comprising a diaphragm and a vibrating plate as described above connected to the diaphragm.

[0020] The present invention also provides a sound generating device, the sound generating device comprising the diaphragm assembly as described above.

[0021] The present invention also provides an electronic device, which includes the sound-generating device as described above.

[0022] This invention provides a vibrating plate, a diaphragm assembly, a sound-generating device, and an electronic device. The vibrating plate is applied to the sound-generating device. The vibrating plate includes a foamed metal layer and a hydrophobic layer. The foamed metal layer has air-permeable channels. The hydrophobic layer covers at least a portion of the surface of the foamed metal layer and at least a portion of the inner wall of the air-permeable channels. The air permeability of the vibrating plate is greater than or equal to 1 ml / (cm²). 2 ·min)@7kPa. Foamed metal has a porous structure, good air permeability, strong thermal conductivity, and high tensile modulus. On the one hand, its strong thermal conductivity can effectively and promptly transfer heat from inside the sound-generating device, reducing gas expansion and thus minimizing pressure on the diaphragm. Simultaneously, combined with the air permeable channels, it allows for rapid gas exchange between the acoustic cavities on both sides of the diaphragm, balancing the pressure difference and ensuring the diaphragm remains in a balanced position, reducing distortion. It also reduces the risk of damage to internal electronic components due to overheating, effectively preventing a decline in acoustic performance during use and achieving the goal of improving acoustic performance. On the other hand, the high tensile modulus provides sufficient strength and support for the diaphragm, improving the high-frequency performance of the sound-generating device and achieving the goal of reducing resonance and improving acoustic performance. However, the pore structure of foamed metal is difficult to meet waterproofing requirements. Therefore, by covering at least a portion of the surface of the foamed metal layer and at least a portion of the inner wall of the venting pores with a hydrophobic layer, the venting pore structure of the foamed metal layer can be preserved to meet the breathability requirements, while the pore size of the pore structure in the foamed metal layer can be reduced, increasing the water droplet angle and thus preventing liquid from flowing through the venting pores in the vibrating plate, thereby improving the waterproofing performance of the vibrating plate. Therefore, this solves the technical problem that the vibrating plates of existing sound-generating devices cannot simultaneously meet the requirements of waterproofing and acoustic performance. It can combine superior waterproofing and acoustic performance, which is beneficial to meeting the actual needs of sound-generating devices for waterproofing, breathability, heat dissipation, and high modulus of the vibrating plate, ensuring that the sound-generating device maintains excellent acoustic performance throughout its use. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the vibrating plate in an embodiment of the present invention;

[0025] Figure 2 This is an example cross-sectional view of the sound-generating device in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the diaphragm assembly in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the foam metal layer in an embodiment of the present invention;

[0028] Figure 5 This is a comparison chart of the heating curves of the embodiments and comparative examples of the present invention;

[0029] Figure 6 This is a comparison chart of amplitude curves for embodiments and comparative examples of the present invention.

[0030] Explanation of reference numerals in the accompanying drawings of the embodiments:

[0031] 30 Ventilation channels 21 Foam pores 22 Metal skeleton 100 Sound-generating device 110 shell 120 Diaphragm assembly 130 Voice coil 140 Magnetic circuit system 121 diaphragm 122 Vibrating plate

[0032] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides a vibrating plate. In one embodiment of the vibrating plate, refer to... Figure 1 The vibrating plate is used in a sound-generating device. The vibrating plate 122 includes a foam metal layer 20 and a hydrophobic layer 10. The foam metal layer 20 has air-permeable channels 30. The hydrophobic layer 10 covers at least a portion of the surface of the foam metal layer 20 and at least a portion of the inner wall of the air-permeable channels 30. The air permeability of the vibrating plate 122 is greater than or equal to 1 ml / (cm²). 2 ·min)@7kPa.

[0035] In this embodiment, refer to Figure 2 , Figure 2 This is an example cross-sectional view of a sound-generating device 100 in an embodiment of the present invention. The sound-generating device 100 includes a housing 110, a vibration system disposed within the housing 110, and a magnetic circuit system 140 cooperating with the vibration system. The vibration system includes a diaphragm assembly 120 and a voice coil 130 coupled to one side of the diaphragm assembly 120. The magnetic circuit system 140 drives the voice coil 130 to vibrate, thereby causing the diaphragm assembly 120 to produce sound. (Refer to...) Figure 3 The diaphragm assembly 120 includes a diaphragm 121 and a vibrating plate 122 connected to the diaphragm 121. When the sound-generating device 100 is working, an electrical signal is input to the voice coil 130. The voice coil 130 is driven by the magnetic circuit system 140 and moves with different amplitudes and directions as the signal magnitude and direction alternate, thereby driving the diaphragm assembly 120 to vibrate and emit sound, thus completing the conversion process of electrical energy to mechanical energy to sound energy. To prevent damage or failure of the magnetic circuit system 140 and other components inside the sound-generating device 100 after contact with water, the vibrating plate 122 is required to have waterproof performance. To achieve good waterproof performance, the sound-generating device 100 module and individual units are required to have good sealing. However, during the use of the sound-generating device 100, the temperature continuously rises, and the heat inside the sound-generating device 100 cannot be transferred out in a timely and effective manner. The gas expands due to heat, the diaphragm 121 deviates from its equilibrium position, and the performance of the sound-generating device 100 changes, resulting in severe distortion. On the other hand, after the water pressure process, due to the sealed cavity and air compression, the diaphragm 121 of the sound-generating device 100 deviates backward from the acoustic cavity. Upon returning to normal pressure, gas exchange is impossible, and the diaphragm 121 cannot return to its equilibrium position. This makes it difficult for the sound-generating device 100 to vibrate normally, severely affecting its sound output. Furthermore, the vibrating plate 122 has low strength and rigidity, easily causing resonance and reducing the acoustic performance of the sound-generating device 100. Therefore, the vibrating plate 122 usually requires higher strength and rigidity. Currently, waterproofing and breathability can be achieved by creating openings in the casing of the terminal device or the vibrating plate 122 and attaching a waterproof and breathable membrane to the openings. However, this method still carries the risk of waterproofing failure when the adhesive layer has defects or comes unglued. Moreover, creating openings in the vibrating plate 122 can reduce its modulus and strength, thus affecting the high-frequency performance of the sound-generating device 100.

[0036] Therefore, in this application, on the one hand, the hydrophobic layer 10 is supported by the foam metal layer 20, thereby improving the strength of the vibrating plate 122. Furthermore, since the foam metal layer 20 is composed of a metal skeleton 22 and foam pores 21 formed by the metal skeleton 22, its overall density is relatively low. This allows for sufficient strength while meeting the lightweight requirement of the vibrating plate 122. At least some of the foam pores 21 in the foam metal layer 20 are interconnected, forming a permeable channel 30 extending along the thickness direction of the foam metal layer 20. Gas can flow from one side of the vibrating plate 122 to the other through the permeable channel 30, thus exhibiting good permeability. This allows the gas permeability of the vibrating plate 122 to be greater than or equal to 1 ml / (cm²). 2At a pressure of 7 kPa, during the use of the sound-generating device 100, the temperature continuously rises. After the gas expands due to heat, it can dissipate through the venting channels 30. Simultaneously, heat can also be conducted away through the metal frame 22, achieving heat dissipation. On the other hand, by covering at least a portion of the surface of the foam metal layer 20 and at least a portion of the inner wall of the venting channels 30 with a hydrophobic layer 10, while retaining the structure of the venting channels 30 of the foam metal layer 20 and meeting the requirements for breathability, the pore size of the channels in the foam metal layer 20 is reduced, increasing the water droplet angle. This prevents liquid from flowing through the venting channels 30 in the vibrating plate 122, improving the waterproof performance of the vibrating plate 122. Thus, the vibrating plate 122 can simultaneously meet multiple requirements for waterproofness, breathability, heat dissipation, high modulus, and lightweight.

[0037] The vibrating plate 122 includes a foamed metal layer 20 and a hydrophobic layer 10 covering at least a portion of the surface of the foamed metal layer 20 and at least a portion of the inner wall of the venting channels 30. The hydrophobic layer 10 can be processed onto the surface of the foamed metal layer 20 by at least one of the following methods: chemical vapor deposition, physical vapor deposition, plasma deposition, sol-gel method, dip coating, blade coating, and spray coating. The surface of the foamed metal layer 20 includes the surface layer of the foamed metal layer 20 and the inner wall of the venting channels 30 formed inside the foamed metal layer 20. For example, a pre-processed foam metal layer 20 with ventilating channels 30 can be placed on a processing table, and then hydrophobic materials can be deposited on the foam metal layer 20 in multiple directions. The ventilating channels 30 formed inside the foam metal layer 20 have openings on the surface of the foam metal layer 20. Some hydrophobic materials may fall to the openings of the channels and thus fall into the ventilating channels 30 through the openings, and finally be deposited on the inner wall of the ventilating channels 30. Some hydrophobic materials that do not fall to the openings of the channels are deposited on the surface of the foam metal layer 20.

[0038] The foamed metal layer 20 is made of foamed metal material. The foamed metal refers to a special metal material containing foam pores 21. (Refer to...) Figure 4 The metal skeleton 22 of the foam metal is made of metal, and at least some of the foam pores 21 in the foam metal are interconnected, forming a permeable channel 30 that runs through the thickness direction of the foam metal layer 20. Gas can flow from one side of the vibrating plate 122 to the other side through the permeable channel 30, thereby giving the foam metal layer 20 good air permeability. The foam metal has the characteristics of high strength, high modulus, and high thermal conductivity of metal materials. At the same time, due to the large number of foam pores 21, its density is greatly reduced compared to metal materials, which is beneficial to meeting the lightweight requirements of electronic devices.

[0039] Optionally, the foam metal layer 20 includes at least one of foam copper, foam nickel, foam aluminum, foam iron-nickel alloy, and foam copper-nickel alloy.

[0040] In this embodiment, the metal skeleton 22 of the foam metal layer 20 can be made of metals such as copper, nickel, and aluminum, or their alloys. Among them, aluminum has high thermal conductivity and low mass, which is beneficial to meeting the requirements of lightweight and high thermal conductivity of electronic devices.

[0041] Optionally, the pore diameter of the venting channel 30 is 0.1-2 mm;

[0042] And / or, the porosity of the foam metal layer 20 is 40%-95%;

[0043] And / or, the pore density of the foam metal layer 20 is 5-100 PPi.

[0044] In this embodiment, the larger the pore size of the foam metal layer 20, the better the air permeability and the shorter the air pressure balance time on both sides. However, the strength will decrease accordingly, and the waterproof performance will also decrease. In order to ensure that the foam metal layer 20 can provide sufficient strength and waterproof performance while also having good air permeability, the pore size of the foam metal layer 20 is determined to be 0.1-2mm, such as 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, etc.

[0045] The porosity refers to the percentage of the total volume of the air pores 30 and the foam metal layer 20 in their natural state. The higher the porosity of the foam metal layer 20, the lower the density of the foam metal and the better the air permeability, but the strength will decrease accordingly. In order to ensure that the foam metal layer 20 can provide sufficient strength while having good air permeability and low density, the porosity of the foam metal layer 20 is determined to be 40%-95%, such as 40%, 50%, 60%, 70%, 80%, 90%, 95%, etc.

[0046] Pore ​​density refers to the number of pores per unit inch. Under the same porosity conditions, as the pore density increases, the number of channels for gas flow in the foam metal increases, but the flow resistance also increases. Therefore, it is necessary to set a reasonable pore density to ensure that the foam metal has good air permeability. Therefore, the pore density of the foam metal layer 20 is determined to be 5-100 PPi, such as 5 PPi, 10 PPi, 30 PPi, 50 PPi, 70 PPi, 90 PPi, 100 PPi, etc.

[0047] Optionally, the effective thermal conductivity of the foam metal layer 20 is greater than or equal to 1 W / (m·K).

[0048] In this embodiment, the thermal conductivity of the foam metal layer 20 on any cross section is affected by both the metal skeleton 22 and the foam pores 21. The metal skeleton 22 has a high thermal conductivity. At the same time, if there are more foam pores 21 and the foam pores 21 are interconnected, the specific surface area of ​​the metal skeleton 22 can be increased, thereby increasing the heat exchange area between the metal skeleton 22 and the air, improving the thermal conductivity of the foam metal layer 20, so that the effective thermal conductivity of the foam metal layer 20 reaches more than 1 W / (m·K).

[0049] In some embodiments of the present invention, the hydrophobic layer 10 is made of a hydrophobic material. The hydrophobic material is selected such that the water droplet angle of the hydrophobic layer 10 is greater than or equal to 90°, and the bonding force between the hydrophobic layer 10 and the foam metal layer 20 is greater than or equal to 3B. The bonding force between the hydrophobic layer 10 and the foam metal layer 20 is tested using a cross-cut adhesion test, with peel test grades ranging from 0 to 5B; the higher the value, the better the bonding force. Exemplarily, the hydrophobic material may include at least one of fluorinated polymers, silicon-containing polymers, benzene-containing polymers, polyurethane polymers, polyester polymers, polyolefin polymers, and rubber polymers. Fluorinated polymers have good waterproof properties but are difficult to bond, resulting in a weaker bonding force between the hydrophobic layer 10 and the foam metal layer 20, and also pose a certain environmental hazard. Silicone-containing waterproof coatings can simultaneously meet the requirements of waterproofing and bonding force, and are more environmentally friendly.

[0050] The hydrophobic layer 10 located on the inner wall of the venting channel 30 can reduce the pore size of the venting channel 30. The smaller the pore size, the greater the critical pressure required for water to penetrate the vibrating plate 122, and the better the waterproof effect. The hydrophobic layer 10 located on the surface of the foam metal layer 20 can increase the water droplet angle of the vibrating plate 122, making the water droplet angle of the vibrating plate 122 greater than 90°. When the water droplet angle of the hydrophobic layer 10 is greater than 90°, the surface energy of the hydrophobic layer 10 is low, which can prevent liquid water wetting and capillary penetration, and has excellent hydrophobicity. Therefore, water is not easy to flow into the venting channel 30 and is difficult to penetrate the vibrating plate 122. At this time, the vibrating plate 122 has a waterproof effect. Moreover, the larger the water droplet angle of the vibrating plate 122, the stronger the hydrophobicity and the better the waterproof effect. This allows the vibrating plate 122 to withstand a hydrostatic pressure greater than or equal to 0.01 MPa. The hydrostatic pressure resistance of the vibrating plate 122 can be tested using a hydrostatic pressure tester, referring to GB / T4744-2013. The magnitude of the hydrostatic pressure reflects the resistance encountered when water penetrates into the inner side of the vibrating plate 122. The higher the water pressure, the higher the waterproof rating of the vibrating plate 122. The hydrostatic pressure resistance of the vibrating plate 122 is greater than or equal to 0.01 MPa, indicating that the vibrating plate 122 has good hydrostatic pressure resistance, thus ensuring that the sound-generating device 100 will not leak during waterproof testing or underwater use.

[0051] The greater the thickness of the hydrophobic layer 10, the smaller the pore size of the porous structure, and the better the waterproof effect. However, if the thickness of the hydrophobic layer 10 is too large, it may cause the porous structure to become blocked, resulting in a lower gas permeability. This, in turn, leads to a lower efficiency in balancing the pressure difference between the acoustic cavities on both sides of the diaphragm assembly 120. If the pressure difference cannot be balanced in time, there may still be excessive internal pressure, causing the diaphragm assembly to deviate from its equilibrium position and affecting the sound quality. Therefore, the thickness of the hydrophobic layer 10 is determined to be 5nm-40μm, for example, 5nm, 20nm, 100nm, 500nm, 1μm, 10μm, 20μm, 40μm, etc.

[0052] Optionally, the hydrophobic layer 10 includes a high thermal radiation filler, wherein the thermal radiation coefficient of the high thermal radiation filler is greater than 0.7, and the high thermal radiation filler includes at least one of carbon black, graphene, carbon nanotubes, silicon carbide, alumina, iron oxide, and copper oxide.

[0053] In this embodiment, the metal skeleton 22 of the foam metal layer 20 has high thermal conductivity, which can effectively transfer heat from the inside of the speaker to the outer surface. However, the thermal radiation coefficient of the hydrophobic coating is usually low, and it cannot effectively radiate heat into the air. Therefore, the thermal conductivity of the hydrophobic layer 10 can be improved by adding a high thermal radiation filler to the hydrophobic layer 10. The thermal radiation coefficient of the high thermal radiation filler is greater than 0.7. The high thermal radiation filler may include at least one of carbon black, graphene, carbon nanotubes, silicon carbide, alumina, iron oxide, and copper oxide, thereby making the thermal radiation coefficient of the hydrophobic layer 10 reach 0.5 or higher.

[0054] Optionally, the high thermal radiation filler accounts for 5%-50% of the mass of the hydrophobic layer 10.

[0055] In this embodiment, the more filler added, the better the thermal radiation performance of the hydrophobic layer 10. However, due to the poor adhesion of the filler, the bonding force between the hydrophobic layer 10 and the foam metal layer 20 will be reduced. Therefore, the mass percentage of the filler in the hydrophobic layer 10 is determined to be 5%-50%, such as 5%, 10%, 20%, 30%, 40%, 50%, etc.

[0056] In this embodiment, the vibrating plate is applied to a sound-generating device. The vibrating plate includes a foamed metal layer and a hydrophobic layer, the foamed metal layer having air-permeable channels; the hydrophobic layer covers at least a portion of the surface of the foamed metal layer and at least a portion of the inner wall of the air-permeable channels; the air permeability of the vibrating plate is greater than or equal to 1 ml / (cm²). 2·min)@7kPa. Foamed metal has a porous structure, good air permeability, strong thermal conductivity, and high tensile modulus. On the one hand, its strong thermal conductivity can effectively and promptly transfer heat from inside the sound-generating device, reducing gas expansion and thus minimizing pressure on the diaphragm. Simultaneously, combined with the air permeable channels, it allows for rapid gas exchange between the acoustic cavities on both sides of the diaphragm, balancing the pressure difference and ensuring the diaphragm remains in a balanced position, reducing distortion. It also reduces the risk of damage to internal electronic components due to overheating, effectively preventing a decline in acoustic performance during use and achieving the goal of improving acoustic performance. On the other hand, the high tensile modulus provides sufficient strength and support for the diaphragm, improving the high-frequency performance of the sound-generating device and achieving the goal of reducing resonance and improving acoustic performance. However, the pore structure of foamed metal is difficult to meet waterproofing requirements. Therefore, by covering at least a portion of the surface of the foamed metal layer and at least a portion of the inner wall of the venting pores with a hydrophobic layer, the venting pore structure of the foamed metal layer can be preserved to meet the breathability requirements, while the pore size of the pore structure in the foamed metal layer can be reduced, increasing the water droplet angle and thus preventing liquid from flowing through the venting pores in the vibrating plate, thereby improving the waterproofing performance of the vibrating plate. Therefore, this solves the technical problem that the vibrating plates of existing sound-generating devices cannot simultaneously meet the requirements of waterproofing and acoustic performance. It can combine superior waterproofing and acoustic performance, which is beneficial to meeting the actual needs of sound-generating devices for waterproofing, breathability, heat dissipation, and high modulus of the vibrating plate, ensuring that the sound-generating device maintains excellent acoustic performance throughout its use.

[0057] Furthermore, the present invention also discloses a diaphragm assembly, with reference to... Figure 3 The diaphragm assembly 120 includes a diaphragm 121 and a vibrating plate 122 connected to the diaphragm 121 as described above.

[0058] The diaphragm assembly provided by this invention solves the technical problem that the vibrating plate in existing diaphragm assemblies cannot simultaneously meet the requirements of waterproof performance and acoustic performance. Compared with the prior art, the beneficial effects of the diaphragm assembly provided by the embodiments of this invention are the same as the beneficial effects of the vibrating plate in the above embodiments, and will not be repeated here.

[0059] Furthermore, the present invention also discloses a sound-generating device, referring to... Figure 2 The sound-generating device 100 includes the diaphragm assembly 120 as described above.

[0060] In this embodiment, the sound-generating device 100 can be a loudspeaker; for example, refer to... Figure 2 , Figure 2This is an example cross-sectional view of a sound-generating device 100 in an embodiment of the present invention. The sound-generating device 100 includes a housing 110, a vibration system disposed within the housing 110, and a magnetic circuit system 140 cooperating with the vibration system. The vibration system includes a diaphragm assembly 120 and a voice coil 130 coupled to one side of the diaphragm assembly 120. The magnetic circuit system 140 drives the voice coil 130 to vibrate, thereby causing the diaphragm assembly 120 to produce sound. (Refer to...) Figure 3 The diaphragm assembly 120 includes a diaphragm 121 and a vibrating plate 122 connected to the diaphragm 121. When the sound-generating device 100 is working, an electrical signal is input to the voice coil 130. The voice coil 130 is driven by the magnetic circuit system 140 and moves with different amplitudes and directions as the signal magnitude and positive and negative directions alternate, thereby driving the diaphragm assembly 120 to vibrate and emit sound, thus completing the process of converting electrical energy into mechanical energy into sound energy.

[0061] The sound-generating device provided by this invention solves the technical problem that the vibrating plate of existing sound-generating devices cannot simultaneously meet the requirements of lightweight and high strength. Compared with the prior art, the beneficial effects of the sound-generating device provided by the embodiments of this invention are the same as the beneficial effects of the vibrating plate in the above embodiments, and will not be repeated here.

[0062] Furthermore, the present invention also discloses an electronic device, which includes the sound-generating device described above.

[0063] In this embodiment, the electronic devices include mobile phones, laptops, tablets, VR (Virtual Reality) devices, AR (Augmented Reality) devices, TWS (True Wireless Stereo) earphones, smart speakers, smart wearable devices, etc.

[0064] The electronic device provided by this invention solves the technical problem that the vibrating plate of existing electronic devices cannot simultaneously meet the requirements of waterproof performance and acoustic performance. Compared with the prior art, the beneficial effects of the electronic device provided by the embodiments of this invention are the same as the beneficial effects of the sound-generating device in the above embodiments, and will not be repeated here.

[0065] The housing of the present invention will now be described in detail with reference to specific embodiments and comparative examples. It is to be understood that the following description is merely exemplary and not intended to limit the specific scope of the invention.

[0066] Example

[0067] The vibrating plate consists of a 300μm thick foam metal layer, a 10μm thick silicone hydrophobic layer sprayed on the surface, and 10% sheet graphene filler added to the hydrophobic layer.

[0068] Comparative Example

[0069] The vibrating plate consists of a 300μm thick PET (polyethylene glycol terephthalate) film, with a 20μm thick polytetrafluoroethylene film attached after the PET film surface is perforated.

[0070] The gas permeability and thermal conductivity of the comparative and exemplary vibrating plates were tested, and the results are shown in Table 1. The gas permeability test method followed GB / T 1038-2000, with each sample tested three times and the average value taken.

[0071] The diaphragm plates of the comparative example and the embodiment were die-cut into the same shape and then integrally injection molded with the same liquid silicone rubber to form diaphragm assemblies. These assemblies were then assembled into sound-generating devices. Hydrostatic pressure resistance tests were performed on the sound-generating devices corresponding to the embodiment and the comparative example. The hydrostatic pressure resistance test was conducted according to GB / T 4744-2013 using a hydrostatic pressure tester. The magnitude of the hydrostatic pressure reflects the resistance encountered when water penetrates the inner side of the diaphragm. One side of the diaphragm was subjected to a gradually increasing water pressure until water penetrated through three points on the other side of the diaphragm, and the water pressure value at this point was recorded. The higher the water pressure, the higher the waterproof rating of the diaphragm.

[0072] The voice coil temperature of the sound-generating devices corresponding to the embodiments and the comparative examples was tested after a 650s rated power test, and the test results are as follows: Figure 5 As shown.

[0073] The amplitude of the sound-generating devices corresponding to the embodiments and the comparative embodiments was tested after a 650s rated power test, and the amplitude curves are shown below. Figure 6 As shown.

[0074] Table 1

[0075]

[0076] Therefore, compared with the comparative example, the diaphragm of the embodiment adopts a combination of a foam metal layer and a hydrophobic layer with high emissivity. The heat generated by the voice coil during the vibration of the sound-generating device can be quickly transferred to the hydrophobic coating on the surface through the foam metal layer, and then the hydrophobic coating can effectively radiate the heat to the outside air, thereby regulating the temperature rise of the voice coil during the use of the sound-generating device.

[0077] In this embodiment, the diaphragm is breathable except at the locations where it is bonded to the diaphragm and the voice coil. Therefore, the breathable area is much larger than that of the comparative example, and the gas permeability is much greater than that of the comparative example.

[0078] Both the example and the comparative examples can meet the 0.1MPa water pressure test, which is equivalent to meeting the 10-meter waterproof requirement.

[0079] Depend on Figure 6 It can be seen that the embodiment exhibits good vertical amplitude symmetry, with a maximum upper amplitude of 0.25 mm and a maximum lower amplitude of 0.25 mm. In contrast, the comparative example shows a significant difference in vertical amplitude, with a maximum upper amplitude of 0.24 mm and a maximum lower amplitude of 0.27 mm. This is because the vibrating plate of the embodiment is breathable. When the temperature of the acoustic cavity rises after the sound-generating device, the gas expands. The expanded gas can pass through the vibrating plate of the embodiment, thereby balancing the air pressure in the front and rear acoustic cavities. The diaphragm is always in a balanced position, resulting in good amplitude symmetry. Although the comparative example also has a breathable effect, the breathable area is small, the air permeability is low, and the effect of balancing air pressure is insufficient.

[0080] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A vibrating plate, characterized in that, The vibrating plate is used in a sound-generating device. The vibrating plate includes a foamed metal layer and a hydrophobic layer. The foamed metal layer has air-permeable channels. The hydrophobic layer covers at least a portion of the surface of the foamed metal layer and at least a portion of the inner wall of the air-permeable channels. The air permeability of the vibrating plate is greater than or equal to 1 ml / (cm²). 2 •min)@7kPa, the bonding force between the hydrophobic layer and the foam metal layer is greater than or equal to 3B.

2. The vibrating plate as described in claim 1, characterized in that, The hydrophobic layer includes at least one of the following: fluorine-containing polymers, silicon-containing polymers, benzene-containing polymers, polyurethane polymers, polyester polymers, polyolefin polymers, and rubber polymers.

3. The vibrating plate as described in claim 1, characterized in that, The hydrophobic layer includes a high thermal radiation filler, wherein the thermal radiation coefficient of the high thermal radiation filler is greater than 0.7, and the high thermal radiation filler includes at least one of carbon black, graphene, carbon nanotubes, silicon carbide, alumina, iron oxide, and copper oxide.

4. The vibrating plate as described in claim 3, characterized in that, The high thermal radiation filler accounts for 5%-50% of the mass of the hydrophobic layer.

5. The vibrating plate as described in claim 1, characterized in that, The thickness of the hydrophobic layer is 5nm-40μm; And / or, the water droplet angle of the hydrophobic layer is greater than or equal to 90°.

6. The vibrating plate as described in claim 1, characterized in that, The pore size of the air vent is 0.1-2 mm; And / or, the porosity of the foamed metal layer is 40%-95%; And / or, the pore density of the foamed metal layer is 5-100 PPi.

7. The vibrating plate as described in claim 1, characterized in that, The effective thermal conductivity of the foamed metal layer is greater than or equal to 1 W / (m·K).

8. The vibrating plate as described in claim 1, characterized in that, The foam metal layer includes at least one of foamed copper, foamed nickel, foamed aluminum, foamed iron-nickel alloy, and foamed copper-nickel alloy.

9. The vibrating plate as described in claim 1, characterized in that, The vibrating plate is resistant to hydrostatic pressure greater than or equal to 0.01 MPa.

10. The vibrating plate as described in claim 1, characterized in that, The hydrophobic layer is processed by at least one of chemical vapor deposition, physical vapor deposition, plasma deposition, sol-gel method, dip coating, blade coating and spray coating.

11. A diaphragm assembly, characterized in that, The diaphragm assembly is used in a sound-generating device, including a diaphragm and a vibrating plate as described in any one of claims 1-10 connected to the diaphragm.

12. A sound-generating device, characterized in that, The sound-generating device includes the diaphragm assembly as described in claim 11.

13. An electronic device, characterized in that, Includes the sound-generating device according to claim 12.

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