Sound generating device and electronic device having the same

Abstract

The present invention discloses a sound generating device and an electronic device having the same. The sound generating device includes: a housing, the housing includes a front cover, a middle case and a lower case, the middle case is provided on one side of the lower case, and the front cover is provided on the side of the middle case away from the lower case; a diaphragm assembly, the diaphragm assembly is provided on the side of the lower case close to the middle case, the outer periphery of the diaphragm assembly is fixed to the middle case, and the front cover, the middle case and the diaphragm assembly jointly define a front sound cavity of the sound generating device, and the front cover is provided with a sound outlet hole communicating with the front sound cavity; wherein, at least part of the front cover and / or the middle case is a waterproof and breathable part containing an organic aerogel material, the waterproof and breathable part has a breathable channel therein, the outer surface of the waterproof and breathable part has pores communicating with the breathable channel, the pore diameter of the pores is 0.05μm to 20μm, and the porosity of the waterproof and breathable part is 10% to 70%. According to the sound generating device of the present invention, the provided waterproof and breathable part can play a role in waterproofing and breathing, balancing the pressure difference between the front and rear sound cavities, reducing cavity resonance and distortion on the premise of meeting the waterproof effect.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic devices, and more particularly, to a sound generating device and an electronic device having the same. Background Art

[0002] Currently, with the rapid development of electronic devices, the application scenarios of wearable devices in daily life have gradually increased. For example, more and more smart watches can be worn by users when swimming or diving, which makes the waterproof performance of wearable devices more important. Correspondingly, this also poses higher requirements for the speakers inside wearable products. The speakers need to have better performance, be thinner and lighter, and at the same time meet higher-level waterproof requirements.

[0003] In the related art, in order to balance the pressure difference between the front and rear chambers of the sound generating device, a waterproof and breathable material is usually used on the dome. However, currently, the product design space of wearable devices is getting smaller and smaller. Therefore, the installation space of the sound generating device in wearable devices is also getting smaller and smaller. The method of using a waterproof and breathable membrane material on the dome cannot meet the actual use requirements. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a sound generating device having good waterproof performance and acoustic performance.

[0005] Another object of the present invention is to provide an electronic device having the above-mentioned sound generating device.

[0006] To achieve the above objects, the present invention provides the following technical solutions:

[0007] A sound generating device according to an embodiment of the first aspect of the present invention includes: a housing, the housing includes a front cover, a middle case and a lower case, the middle case is provided on one side of the lower case, and the front cover is provided on the side of the middle case away from the lower case; a diaphragm assembly, the diaphragm assembly is provided on the side of the lower case close to the middle case, the outer periphery of the diaphragm assembly is fixed to the middle case, the front cover, the middle case and the diaphragm assembly jointly define the front sound cavity of the sound generating device, and the front cover is provided with a sound outlet hole communicating with the front sound cavity; wherein, at least part of the front cover and / or the middle case is a waterproof and breathable part containing an organic aerogel material, the waterproof and breathable part has a breathable channel, the outer surface of the waterproof and breathable part has pores communicating with the breathable channel, the pore diameter of the pores is 0.05 μm to 20 μm, and the porosity of the waterproof and breathable part is 10% to 70%.

[0008] According to some embodiments of the present invention, the pore diameter of the breathable channel is 0.05 μm to 100 μm.

[0009] According to some embodiments of the present invention, the air-permeable channel is a non-linear channel.

[0010] According to some embodiments of the present invention, there are multiple air-permeable channels, and the pore diameters of the multiple air-permeable channels are different; and / or, along the flow direction of the air flow, the pore diameters of the air-permeable channels are different.

[0011] According to some embodiments of the present invention, the front cover and / or the middle shell are integrally formed as the waterproof and breathable part.

[0012] According to some embodiments of the present invention, the flexural strength of the waterproof and breathable part > 70 MPa; and / or, the flexural modulus of the waterproof and breathable part is greater than 4 GPa.

[0013] According to some embodiments of the present invention, the density of the waterproof and breathable part is 0.7 g / cm 3 ~1.3 g / cm 3 .

[0014] According to some embodiments of the present invention, the organic aerogel material includes at least one of polyimide-based aerogel, polyamide-based aerogel, polyester-based aerogel, aldehyde-based aerogel, polyolefin-based aerogel, and polysaccharide-based aerogel.

[0015] According to some embodiments of the present invention, the waterproof and breathable part further includes a reinforcing material, and the reinforcing material is compounded with the organic aerogel material.

[0016] According to some embodiments of the present invention, the reinforcing material is an organic fiber material and / or an inorganic fiber material, the organic aerogel material is distributed on the outer surface of the reinforcing material, and the mass percentage of the reinforcing material in the waterproof and breathable part is 5% - 60%.

[0017] According to some embodiments of the present invention, the reinforcing material is a porous metal framework with a pore structure, the organic aerogel material is distributed on the surface and in the pore structure of the porous metal framework, and the mass percentage of the organic aerogel material in the waterproof and breathable part is 30% - 70%.

[0018] The electronic device according to the second aspect embodiment of the present invention includes the sound generating device according to any one of the above embodiments.

[0019] The sound generating device according to an embodiment of the present invention has at least a part of the front cover and the middle shell provided as a waterproof and breathable part, and the waterproof and breathable part contains an organic aerogel material, so that the waterproof and breathable part has an open pore channel, which can balance the air pressure between the front sound cavity and the outside world, improve the vibration reliability of the sound generating device, increase the virtual inner cavity volume of the sound generating device, reduce the cavity resonance, reduce the distortion, and improve the performance of the sound generating device; at the same time, by controlling the pore diameter of the air holes and the porosity of the waterproof and breathable part, water droplets can be prevented from entering the shell through the waterproof and breathable part, thereby improving the waterproof performance of the sound generating device.

[0020] Other features and advantages of the present invention will become clear from the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0022] Figure 1 is a schematic structural diagram of a sound generating device according to an embodiment of the present invention;

[0023] Figure 2 is an exploded view of a sound generating device according to an embodiment of the present invention;

[0024] Figure 3 is a sectional view of a sound generating device according to an embodiment of the present invention;

[0025] Figure 4 is a THD test curve graph of a sound generating device according to an embodiment of the present invention and a comparative example.

[0026] Reference Numerals:

[0027] Sound generating device 100;

[0028] Housing 10; Front cover 11; Sound outlet hole 111; Middle shell 12; Lower shell 13; Front sound cavity 14;

[0029] Diaphragm assembly 20; Voice coil 30; Magnetic circuit system 40. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way limits the present invention, its application or use.

[0032] Known technologies, methods, and devices that are known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0033] In all of the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0034] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

[0035] First, the sound generating device 100 according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings.

[0036] As Figures 1 to 3 shown, the sound generating device 100 according to an embodiment of the present invention includes a housing 10 and a diaphragm assembly 20.

[0037] Specifically, the housing 10 includes a front cover 11, a middle shell 12, and a lower shell 13. The middle shell 12 is disposed on one side of the lower shell 13, and the front cover 11 is disposed on the side of the middle shell 12 away from the lower shell 13. The diaphragm assembly 20 is disposed on the side of the lower shell 13 close to the middle shell 12. The outer periphery of the diaphragm assembly 20 is fixed to the middle shell 12. The front cover 11, the middle shell 12, and the diaphragm assembly 20 together define a front sound cavity 14 of the sound generating device 100. The front cover 11 is provided with a sound outlet hole 111 communicating with the front sound cavity 14. Among them, at least part of the front cover 11 and / or the middle shell 12 is a waterproof and breathable part containing an organic aerogel material. The waterproof and breathable part has a breathable channel, and the outer surface of the waterproof and breathable part has air holes communicating with the breathable channel. The aperture of the air holes is 0.05 μm to 20 μm, and the porosity of the waterproof and breathable part is 10% to 70%.

[0038] In other words, the sound generating device 100 according to an embodiment of the present invention mainly consists of a housing 10, a diaphragm assembly 20 disposed in the housing 10, a voice coil 30, a magnetic circuit system 40, etc. The housing 10 is composed of a front cover 11, a middle shell 12, a lower shell 13, etc. Among them, the middle shell 12 is disposed between the lower shell 13 and the front cover 11. The front cover 11 is disposed on one side of the middle shell 12, and the lower shell 13 is disposed on the other side of the middle shell 12. The front cover 11, the middle shell 12, and the lower shell 13 cooperate to define a receiving space. The diaphragm assembly 20 is disposed in the middle shell 12, and the diaphragm assembly 20 cooperates with the front cover 11 and the middle shell 12 to define a front sound cavity 14 of the sound generating device 100 in the receiving space. The front cover 11 is provided with a sound outlet hole 111, and the sound outlet hole 111 can communicate with the front sound cavity 14.

[0039] Among them, at least one of the front cover 11 and the middle shell 12 is provided with a waterproof and breathable part, which contains an organic aerogel material. The waterproof and breathable part made of the organic aerogel material has a breathable channel inside, and air holes communicating with the breathable channel are arranged on the outer surface of the waterproof and breathable part. The aperture of the air holes is controlled between 0.05 μm and 20 μm. For example, it can be 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 5 μm, 20 μm, etc. It can be understood that the diameter of the water droplet is about 100 μm, which is much larger than the aperture of the air holes on the outer surface of the waterproof and breathable part, making it difficult for the water droplet to enter the front sound cavity 14 through the air holes and the breathable channel, thereby improving the waterproof performance of the sound generating device 100.

[0040] Among them, the porosity of the waterproof and breathable part is between 10% and 70%. For example, it can be 10%, 20%, 30%, 50%, 70%, etc. While increasing the breathable area of the air holes and the breathable channel, it can also control the air pressure balance between the front sound cavity 14 and the outside world, thereby improving the vibration reliability of the sound generating device 100. At the same time, the setting of the air holes and the breathable channel can also increase the virtual cavity volume of the front sound cavity 14, thereby reducing the cavity resonance of the front sound cavity 14 and improving the sound generating performance of the sound generating device 100.

[0041] It should be noted that the organic aerogel material is a solid material with a large porosity and a high specific surface area. Most of its volume is composed of air. By controlling parameters such as the porosity and aperture size of the organic aerogel material, while adjusting the waterproof performance of the waterproof and breathable part, parameters such as the density, strength, stiffness and anti-deformation ability of the waterproof and breathable part can be adjusted to ensure the structural strength of the front cover 11 and the middle shell 12. The assembly structures of the voice coil 30, the magnetic circuit system 40, etc. with the outer shell 10 and the diaphragm assembly 20 are understandable and easy to implement for those skilled in the art, so no detailed description will be given here.

[0042] In addition, at least one of the front cover 11 and the middle shell 12 is provided with a waterproof and breathable part. It can be that only the front cover 11 is provided with a waterproof and breathable part, or only the middle shell 12 is provided with a waterproof and breathable part, or both the front cover 11 and the middle shell 12 are provided with a waterproof and breathable part. When a waterproof and breathable part is provided on the front cover 11 or the middle shell 12, the breathable channels on the waterproof and breathable part are all used to communicate with the external space of the sound generating device 100, so as to balance the air pressure between the inner cavity of the sound generating device 100 and the outside world.

[0043] Thus, for the sound generating device 100 according to an embodiment of the present invention, by setting at least a part of the front cover 11 and the middle housing 12 as a waterproof and breathable part, and the waterproof and breathable part includes an organic aerogel material, so that the waterproof and breathable part has an open pore channel, the ventilation area and the virtual inner cavity volume of the sound generating device 100 can be increased. Increasing the ventilation area can balance the air pressure between the front sound cavity 14 and the outside, improving the vibration reliability of the sound generating device 100. Increasing the virtual inner cavity volume of the sound generating device 100 can reduce the cavity resonance, reduce distortion, and improve the performance of the sound generating device 100. At the same time, by controlling the pore diameter of the air holes and the porosity of the waterproof and breathable part, water droplets can be prevented from passing through the waterproof and breathable part and entering the front sound cavity 14, thereby improving the waterproof performance of the sound generating device 100.

[0044] Optionally, according to an embodiment of the present invention, the pore diameter of the ventilation channel is 0.05 μm to 100 μm.

[0045] That is to say, the pore diameter of the ventilation channel inside the waterproof and breathable part can be equal to the pore diameter of the air holes on the outer surface of the waterproof and breathable part, or can be larger than the pore diameter of the air holes, as long as it is ensured that the pore diameter of the air holes on the outer surface of the waterproof and breathable part is smaller than the diameter of the water droplets by a certain value. For example, the pore diameter of the ventilation channel can be 0.05 μm, 1 μm, 2 μm, 5 μm, 10 μm, 20 μm, 50 μm, 100 μm, etc.

[0046] Thus, for the sound generating device 100 according to an embodiment of the present invention, on the basis of ensuring the waterproof performance of the waterproof and breathable part, the virtual space of the front sound cavity 14 can be reasonably increased, the air pressure balance effect between the front sound cavity 14 and the outside can be improved, and further the cavity resonance can be reduced, the distortion can be reduced, and the sound generating performance of the sound generating device 100 can be improved.

[0047] In some specific embodiments of the present invention, the ventilation channel is a non-linear channel. Optionally, there are multiple ventilation channels, and the pore diameters of the multiple ventilation channels are different; and / or, along the flow direction of the air flow, the pore diameters of the ventilation channels are different.

[0048] In other words, the ventilation channel of the waterproof and breathable part is not a linear channel that directly extends from the inner surface of the front cover 11 or the middle housing 12 to the outer surface, but a curved channel, and the pore diameters of the multiple ventilation channels of the waterproof and breathable part are different.

[0049] It should be noted that the different pore diameters of the multiple ventilation channels may mean that the pore diameters of two different ventilation channels are different, and the pore diameter of each ventilation channel is the same in the air flow direction; or the pore diameter of one ventilation channel is different in the air flow direction; at the same time, it may also be that the pore diameter of each ventilation channel is different in the air flow direction, and the pore diameters of the multiple ventilation channels are also different from each other.

[0050] Thus, by providing a plurality of curved air-permeable channels with different pore diameters in the waterproof and breathable part, the hydrostatic pressure resistance of the waterproof and breathable part can be effectively improved, thereby further enhancing the waterproof performance of the sound generating device 100.

[0051] According to an embodiment of the present invention, the front cover 11 and / or the middle shell 12 are integrally formed as a waterproof and breathable part.

[0052] That is to say, for the front cover 11 and the middle shell 12 according to the embodiments of the present invention, a part thereof may be constituted by a waterproof and breathable part, and the remaining part may be prepared from the conventional materials for preparing the front cover 11 or the middle shell 12 in the art; or the whole may be constituted by a waterproof and breathable part, that is, the whole of the front cover 11 and the middle shell 12 may be prepared from an organic aerogel material.

[0053] Thus, by integrally forming the front cover 11 and / or the middle shell 12 of the sound generating device 100 with a waterproof and breathable part, it is convenient to manufacture, and the pore diameter and porosity of the front cover 11 and / or the middle shell 12 can be controlled more precisely, so as to more precisely control the waterproof performance of the front cover 11 and / or the middle shell 12, and improve the reliability and sound generating performance of the sound generating device 100. Moreover, since the density of the aerogel material is small, the weight of the housing can be reduced, thereby playing a role in reducing the weight of the sound generating device 100 and realizing the lightweight design of the sound generating device.

[0054] In some specific embodiments of the present invention, the flexural strength of the waterproof and breathable part > 70 MPa; and / or, the flexural modulus of the waterproof and breathable part is greater than 4 GPa.

[0055] Considering that the waterproof and breathable part prepared from an organic aerogel material may be deformed or damaged during the use of the front cover 11 and / or the middle shell 12 of the sound generating device 100, therefore, it is necessary to ensure that the flexural strength of the waterproof and breathable part in the front cover 11 and / or the middle shell 12 is greater than 70 MPa to ensure that the front cover 11 and / or the middle shell 12 have strong strength and are not easily deformed and damaged.

[0056] The flexural modulus refers to the ability of a material to resist bending deformation within the elastic limit, that is, the flexural modulus is the ratio of the flexural stress to the deformation generated by bending. The bending property is one of the important physical property indexes of the housing 10 of the sound generating device 100, and the flexural modulus is one of the important data for detecting whether the quality of the housing 10 meets the standard. Generally, the greater the flexural modulus of the housing 10, the stronger the stiffness and anti-deformation ability of the housing 10. The waterproof and breathable part prepared from an organic aerogel material can adjust its flexural modulus by adjusting parameters such as the porosity and pore diameter of the organic aerogel material, so as to meet the requirement of having a higher flexural modulus.

[0057] According to an embodiment of the present invention, the density of the waterproof and breathable part is 0.7 g / cm3 ~1.3 g / cm 3 , for example, it can be 0.7 g / cm 3 , 0.9 g / cm 3 , 1 g / cm 3 , 1.1 g / cm 3 , 1.3 g / cm 3 etc. The density of the waterproof and breathable part can be adjusted by controlling parameters such as the porosity and pore size in the organic aerogel material. By adjusting the density of the waterproof and breathable part, on the basis of ensuring the waterproof performance of the waterproof and breathable part, the quality of the waterproof and breathable part can be reasonably controlled.

[0058] In some specific embodiments of the present invention, the organic aerogel material includes at least one of polyimide-based aerogels, polyamide-based aerogels, polyester-based aerogels, aldehyde-based aerogels, polyolefin-based aerogels, and polysaccharide-based aerogels.

[0059] Specifically, an aerogel refers to a nanoscale porous solid material formed by replacing the liquid phase in a gel with a gas after drying through the sol-gel method, and moreover, the aerogel also has the properties of a gel. In the present invention, the organic aerogel material can be an aerogel made of a polymer organic material, which not only has the characteristics of being porous and lightweight, but also has a relatively large chain length compared with inorganic aerogel materials and has a certain strength, and is suitable for making a housing with certain mechanical requirements. In actual applications, one or several of the above organic aerogel materials can be selected according to the actual needs of the sound generating device 100, and the applicability is stronger.

[0060] Optionally, according to an embodiment of the present invention, the waterproof and breathable part further includes a reinforcing material, and the reinforcing material is compounded with the organic aerogel material.

[0061] That is to say, in order to meet the strength requirements of the housing 10 of the sound generating device 100, a reinforcing material can also be added to the waterproof and breathable part to increase the strength of the waterproof and breathable part, thereby enhancing the strength of the housing 10 of the sound generating device 100.

[0062] In some specific embodiments of the present invention, the reinforcing material is an organic fiber material and / or an inorganic fiber material, the organic aerogel material is distributed on the outer surface of the reinforcing material, and the mass percentage of the reinforcing material in the waterproof and breathable part is 5% - 60%.

[0063] In other words, in the embodiments of the present invention, the reinforcing material can be a fiber material, the fiber material can include an organic fiber material and an inorganic fiber material, and the organic aerogel can be evenly distributed on the outer surface of the fiber material. The mass percentage of the reinforcing material in the corresponding waterproof and breathable part is between 5% and 60%, for example, it can be 5%, 10%, 15%, 25%, 40%, 60%, etc.

[0064] Thus, by adding a reinforcing material made of a fibrous material to the waterproof and breathable part, the flexural modulus and flexural strength of the organic aerogel composite material will also increase accordingly, which can enhance the strength of the waterproof and breathable part.

[0065] In some other specific embodiments of the present invention, the reinforcing material is a porous metal framework having a pore structure, and the organic aerogel material is distributed on the surface and within the pore structure of the porous metal framework. The mass percentage of the organic aerogel material in the waterproof and breathable part is 30% - 70%.

[0066] That is to say, in the embodiments of the present invention, the waterproof and breathable part is composed of a metal framework and an organic aerogel material. Among them, the metal framework has a pore structure, and the organic aerogel is uniformly distributed on the outer surface of the metal framework and the inner surface of the pore structure inside it. Moreover, the mass percentage of the organic aerogel material in the corresponding waterproof and breathable part is between 30% and 70%, such as 30%, 35%, 40%, 50%, 60%, 70%, etc.

[0067] Thus, by arranging a metal framework in the waterproof and breathable part and attaching the organic aerogel material to the outer surface of the metal framework and the inner surface of the internal pores, the strength of the waterproof and breathable part can be effectively improved on the basis of ensuring the waterproof and breathable performance of the waterproof and breathable part.

[0068] The electronic device according to an embodiment of the present invention includes the sound generating device 100 according to any one of the above embodiments. The electronic device can be a smart watch, AR, VR and other devices, and the present invention does not limit this.

[0069] Since the sound generating device 100 according to the above embodiments of the present invention has the above technical effects, therefore, the electronic device according to the embodiments of the present invention also has corresponding technical effects, that is, it has excellent waterproof performance, and at the same time, the vibration reliability of the sound generating device 100 can be improved.

[0070] The sound generating device 100 of the present invention will be described in detail below with reference to specific embodiments and comparative examples.

[0071] Embodiment

[0072] The front cover includes an organic aerogel material and carbon fiber. The molding method is as follows: First, prepare a carbon fiber reinforced polyimide aerogel with a mass percentage of 15%, and then injection mold the carbon fiber reinforced polyimide aerogel into a front cover. Assemble the front cover with the middle shell, the lower shell and the diaphragm assembly to form the sound generating device 100.

[0073] Comparative Example

[0074] The front cover is made of PC material, and 25% by mass of glass fiber is added to the PC material to obtain the front cover. The front cover is assembled with the middle shell, the lower shell and the diaphragm assembly to form a sound generating device.

[0075] The front covers of the sound generating devices obtained in the examples and the comparative examples were respectively tested for thickness, mass, flexural modulus, flexural strength and gas permeability. The test results are shown in Table 1 below.

[0076] Table 1 Test results of the front cover

[0077] front cover embodiment comparative example Thickness / mm 0.5 0.5 Mass / mg 19 30 Flexural modulus / GPa 6.5 3.4 Flexural strength / MPa 85 65 <![CDATA[Gas permeability / cm 3 / cm 2 ·s·Pa]]> 0.04 0

[0078] As can be seen from Table 1, when the structures and sizes of the examples and the comparative examples are the same, the mass of the front cover made of the organic aerogel material in the examples is only about 63% of that of the front cover of the injection-molded comparative example, and the weight reduction reaches almost 37%. At the same time, the flexural modulus of the front cover made of the organic aerogel material is almost twice that of the front cover in the comparative example, and the flexural strength of the front cover made of the organic aerogel material exceeds that of the front cover of the comparative example by 20 MPa. The flexural modulus and flexural strength can be used to measure the anti-destruction ability of the product, indicating that the front cover made of the organic aerogel material according to the embodiments of the present invention not only has better strength, stiffness and anti-destruction ability, but also can significantly reduce the product weight on the basis of ensuring the structural design strength of the product, improve the wearing comfort of users, and at the same time reduce the resonance peak generated by vibration, and the overall listening experience is better. In addition, compared with the comparative example, the front cover made of the organic aerogel material in the embodiments of the present invention also has a certain gas permeability, so that the pressure between the front sound cavity and the outside can be balanced, thereby improving the vibration reliability of the sound generating device.

[0079] Through the air permeability test of the front cover, it can be seen that the front cover made of the organic aerogel material in the examples can have a stable gas permeability, while the front cover in the comparative example has no gas permeability, indicating that compared with the comparative example, the front cover made of the organic aerogel material in the embodiments of the present invention can play a role in adjusting the pressure balance between the front sound cavity and the outside of the sound generating device, making the air pressure in the front sound cavity and the rear sound cavity stable and improving the vibration reliability of the sound generating device.

[0080] The sound generating devices using the front covers of the examples and the comparative examples were tested for total harmonic distortion (THD), and the test curves are as Figure 4 shown. As can be seen from Figure 4 , since the front cover in the comparative example has no air holes and air permeation channels, the pressure in the rear sound cavity during the test is relatively large, resulting in an increase in the THD curve, which in turn affects the overall performance. While using the front cover of the example, the THD curve is lower than that of the comparative example, indicating that the sound generating device using the front cover of the example has lower total harmonic distortion and better overall performance.

[0081] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration purposes and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A sound generating device, characterized in that, Comprising: A housing, the housing includes a front cover, a middle shell and a lower shell, the middle shell is disposed on one side of the lower shell, and the front cover is disposed on the side of the middle shell away from the lower shell; A diaphragm assembly, the diaphragm assembly is disposed on the side of the lower shell close to the middle shell, the outer periphery of the diaphragm assembly is fixed to the middle shell, the front cover, the middle shell and the diaphragm assembly jointly define a front sound cavity of the sound generating device, and the front cover is provided with a sound outlet hole communicating with the front sound cavity; Wherein, at least part of the front cover and / or the middle shell is a waterproof and breathable part containing an organic aerogel material, the waterproof and breathable part has a breathable channel, the outer surface of the waterproof and breathable part has pores communicating with the breathable channel, the pore diameter of the pores is 0.05μm - 20μm, and the porosity of the waterproof and breathable part is 10% - 70%; The bending strength of the waterproof and breathable part > 70MPa; and, the bending modulus of the waterproof and breathable part is greater than 4GPa.

2. The sound generating device according to claim 1, wherein The pore diameter of the breathable channel is 0.05μm - 100μm.

3. The sound generating device according to claim 1, characterized in that, The breathable channel is a non-linear channel.

4. The sound generating device according to claim 1, wherein, There are multiple breathable channels, and the pore diameters of the multiple breathable channels are different; And / or, along the flow direction of the air flow, the pore diameters of the breathable channels are different.

5. The sound generating device according to claim 1, characterized in that, The front cover and / or the middle shell is integrally formed as the waterproof and breathable part.

6. The sound generating device according to claim 1, wherein The density of the waterproof and breathable part is 0.7 g / cm 3 ~1.3 g / cm 3 .

7. The sound generating device according to claim 1, wherein The organic aerogel material includes at least one of polyimide-based aerogel, polyamide-based aerogel, polyester-based aerogel, aldehyde-based aerogel, polyolefin-based aerogel, and polysaccharide-based aerogel.

8. The sound generating device according to claim 1, wherein, The waterproof and breathable part further includes a reinforcing material, and the reinforcing material is compounded with the organic aerogel material.

9. The sound generating device according to claim 8, wherein The reinforcing material is an organic fiber material and / or an inorganic fiber material, the organic aerogel material is distributed on the outer surface of the reinforcing material, and the mass percentage of the reinforcing material in the waterproof and breathable part is 5% - 60%.

10. The sound generating device according to claim 8, characterized in that, The reinforcing material is a porous metal frame with a pore structure, the organic aerogel material is distributed on the surface of the porous metal frame and in the pore structure, and the mass percentage of the organic aerogel material in the waterproof and breathable part is 30% - 70%.

11. An electronic device, characterized in that, Including the sound generating device according to any one of claims 1 - 10.

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