Sound generating devices and electronic equipment

Abstract

The present application discloses a sound-emitting device and an electronic device having the same, wherein the sound-emitting device comprises a shell, a sound outlet is arranged on the side wall of the shell, and the shell comprises a first shell and a second shell; a sound-emitting unit, the sound-emitting unit is arranged in the shell and forms a front sound cavity between the sound-emitting unit and the first shell, and the front sound cavity is connected with the sound outlet; wherein at least one end of the first shell away from the sound outlet is provided with a sound-absorbing part, and the surface of the sound-absorbing part facing the sound outlet is provided with an aerogel material layer. According to the sound-emitting device of an embodiment of the present invention, by providing a sound-absorbing part at one end of the first shell away from the sound outlet, and providing an aerogel material layer on the surface of the sound-absorbing part facing the sound outlet, the aerogel material layer has a microporous structure, has air permeability and sound-absorbing effects, can reduce the reflection effect of the shell wall on the opposite side of the sound outlet on the sound waves of the front sound cavity, thereby reducing the resonance peaks and valleys, and improving the acoustic performance of the sound-emitting device.

Description

Technical Field

[0001] The present application relates to the field of electroacoustic technology, and more specifically, to a sound-generating device and an electronic device having the same. Background Art

[0002] In the field of loudspeakers, for side-sounding sound-emitting devices, sound wave reflection will occur in the front cavity of the sound-emitting device. Sound wave reflection mainly refers to the reflection of sound waves by the shell at the opposite end of the side sound outlet. Due to the interference of reflected waves, the FR curve will have many peaks and valleys, resulting in a poor listening experience for users. The longer the front cavity, that is, the farther the side sound outlet is from the shell on the opposite side, the more obvious the interference of reflected waves is, and the more the acoustic performance of the sound-emitting device is reduced. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a sound-generating device having good acoustic performance.

[0004] Another object of the present invention is to provide an electronic device composed of the above-mentioned sound-generating device.

[0005] In order to achieve the above objectives, the present invention provides the following technical solutions.

[0006] According to the first aspect of the present invention, the sound-emitting device comprises: a shell, a sound outlet is provided on the side wall of the shell, and the shell comprises a first shell and a second shell; a sound-emitting unit, the sound-emitting unit is arranged in the shell and forms a front sound cavity between the first shell, and the front sound cavity is connected to the sound outlet; wherein, at least one end of the first shell away from the sound outlet is provided with a sound absorbing part, and the surface of the sound absorbing part facing the sound outlet is provided with an aerogel material layer.

[0007] According to some embodiments of the present invention, at least the sound absorbing part is made of the aerogel material.

[0008] According to some embodiments of the present invention, the first shell is entirely made of the aerogel material.

[0009] According to some embodiments of the present invention, the first shell includes a frame and a metal sheet embedded in the frame, the metal sheet is arranged opposite to the sound-emitting unit, the sound absorbing part is arranged on the frame, and the frame is made of the aerogel material.

[0010] According to some embodiments of the present invention, the skeleton of the aerogel comprises an organic polymer, and the organic polymer is at least one of polyimides, polyamides, polyesters, aldehydes, polyolefins, polysaccharides and silicones.

[0011] According to some embodiments of the present invention, the sound absorbing part further contains a reinforcing material, and the weight percentage of the reinforcing material in the total weight of the sound absorbing part is 0-30%.

[0012] According to some embodiments of the present invention, the reinforcing material is reinforcing fibers and / or reinforcing particles, wherein the reinforcing fibers are at least one of chopped fibers and continuous fibers, and the reinforcing particles are at least one of inorganic particles boron nitride, silicon carbide, carbon black or metal particles.

[0013] According to some embodiments of the present invention, the sound absorbing part further contains an acoustic improving material, and the mass percentage of the acoustic improving material to the total weight of the sound absorbing part is 0-40%.

[0014] According to some embodiments of the present invention, the acoustic improving material is at least one of zeolite, molecular sieve, activated carbon, MOFs, porous alumina and porous silica.

[0015] According to some embodiments of the present invention, the sound absorbing part is prepared from at least one of PC and its modified materials, PA and its modified materials, PPS and its modified materials, PP and its modified materials, ABS and its modified materials, LCP and its modified materials, PEI and its modified materials, phenolic resin and its modified materials, epoxy resin and its modified materials, unsaturated polyester and its modified materials, stainless steel and aluminum alloy, magnesium alloy and metal-based composite materials.

[0016] According to some embodiments of the present invention, the sound absorbing portion has an open-cell channel, and the porosity of the sound absorbing portion is 40%-95%.

[0017] According to some embodiments of the present invention, the pore size of the open channel is 50 nm-200 μm.

[0018] According to some embodiments of the present invention, the density of the sound absorbing part is 0.2 g / cm 3 -1.0g / cm 3 .

[0019] According to some embodiments of the present invention, the overall specific modulus of the sound absorbing part is greater than 2 GPa·cm 3 / g.

[0020] According to some embodiments of the present invention, a distance between an end of the first shell away from the sound outlet and a center position of the sound-emitting unit is not less than 8.5 mm.

[0021] An electronic device according to a second embodiment of the present invention includes the sound generating device according to the above embodiment.

[0022] According to the sound-emitting device of the embodiment of the present invention, a sound-absorbing portion is arranged at an end of the first shell away from the sound outlet, and an aerogel material layer is arranged on the surface of the sound-absorbing portion on the side facing the sound outlet. The aerogel material layer has a microporous structure and has air permeability and sound-absorbing effects. It can reduce the reflection effect of the shell wall on the opposite side of the sound outlet on the sound waves in the front sound cavity and reduce the energy of the reflected waves, thereby reducing the resonance peaks and valleys and improving the acoustic performance of the sound-emitting device.

[0023] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0025] Figure 1 is a schematic structural diagram of a sound-generating device according to an embodiment of the present invention;

[0026] Figure 2 is a partial structural schematic diagram of a first shell of a sound-generating device according to an embodiment of the present invention;

[0027] Figure 3 4 is a comparison diagram of FR curves of a housing provided according to an embodiment of the present invention and a housing provided in a comparative example.

[0028] Reference numerals:

[0029] Sound generating device 100;

[0030] Shell 10; first shell 11; frame 101; metal sheet 102;

[0031] Front sound cavity 111; sound outlet 112, sound absorbing part 113;

[0032] Second shell 12; rear acoustic cavity 121;

[0033] The sound unit 20. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0038] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0039] The following first describes in detail the sound-generating device 100 according to an embodiment of the present invention with reference to the accompanying drawings.

[0040] like Figure 1 As shown, the sound-emitting device 100 according to the embodiment of the present invention includes a housing 10 and a sound-emitting unit 20 .

[0041] Specifically, a sound outlet 112 is provided on the side wall of the housing 10, and the housing 10 includes a first shell 11 and a second shell 12. In this embodiment, a sound outlet 112 is provided on the side wall of the first shell 11, and the sound-emitting unit 20 is provided in the housing 10 and forms a front sound cavity 111 with the first shell 11, and the front sound cavity 111 is connected with the sound outlet 112. Among them, at least one end of the first shell 11 away from the sound outlet 112 is provided with a sound absorbing part 113, and the surface of the sound absorbing part 113 facing the sound outlet 112 is provided with an aerogel material layer. It can be understood that the sound outlet 112 can also be provided on the second shell 12, or formed by the cooperation of the first shell 11 and the second shell 12. The sound outlet 112 has a variety of settings, and this application does not limit it here.

[0042] In other words, the sound-emitting device 100 according to the embodiment of the present invention is mainly composed of a housing 10 and a sound-emitting unit 20, wherein the housing 10 is mainly composed of a first shell 11 and a second shell 12, a housing 10 is defined with a receiving cavity for installing the sound-emitting unit 20, the sound-emitting unit 20 is arranged in the receiving cavity and divides the receiving cavity into two parts, the sound-emitting unit 20 cooperates with the first housing 11 to form a front sound cavity 111, and the sound-emitting unit 20 cooperates with the first housing 11 and the second housing 12 to form a rear sound cavity 121, and a sound outlet 112 connected to the front sound cavity 111 is provided at one end of the first housing 11, and the sound outlet 112 is used to radiate the sound waves of the front sound cavity 111 to the outside. A sound-absorbing portion 113 is provided at the other end of the first housing 11 at a position opposite to the sound outlet 112, and one side of the sound-absorbing portion 113 faces the sound outlet 112, and an aerogel material layer is provided on the surface of the side of the sound-absorbing portion 113 facing the sound outlet 112. The first housing 11 and the sound absorbing portion 113 may be integrally formed of the same material, or may be a combination of different materials.

[0043] It should be noted that aerogel material is a solid material with large porosity and high specific surface area, most of its volume is composed of air, the material has a microporous structure, has strong micro-permeability and sound absorption effects, and the surface of the sound-absorbing part 113 is provided with an aerogel material layer, which can absorb the sound waves reaching the opposite side of the sound outlet 112 from the front sound cavity 111, reduce the reflected wave energy of the shell wall of the first shell 11, and reduce the standing wave of the front sound cavity 111, thereby reducing the resonance peaks and valleys.

[0044] Therefore, according to the sound-emitting device 100 of the embodiment of the present invention, a sound-absorbing portion 113 is provided at one end of the first shell 11 away from the sound outlet 112, and an aerogel material layer is provided on the surface of the sound-absorbing portion 113 on the side facing the sound outlet 112. The aerogel material layer has a microporous structure and has air permeability and sound-absorbing effects. It can absorb the sound waves from the front sound cavity 111 to the opposite side of the sound outlet 112, reduce the reflected wave energy of the shell wall of the first shell 11, reduce the standing wave of the front sound cavity 111, thereby reducing the resonance peaks and valleys, and improving the acoustic performance of the sound-emitting device.

[0045] According to an embodiment of the present invention, at least the sound absorbing part 113 is made of aerogel material.

[0046] In other words, the aerogel material layer may be only one layer of the sound absorbing material layer coated on the sound absorbing part 113, that is, when preparing the housing 10, the first shell 11 and the sound absorbing part 113 may be prepared first, and then the aerogel material layer may be coated on the side of the sound absorbing part 113 facing the sound outlet 112. Alternatively, the entire sound absorbing part 113 may be prepared by the aerogel material layer.

[0047] Therefore, by making the entire sound absorbing part 113 out of aerogel material, the sound absorbing effect of the sound absorbing part 113 can be further improved, the reflection effect of the shell wall on the opposite side of the sound outlet 112 on the sound waves in the front sound cavity can be reduced, the resonance peaks and valleys of the sound-emitting device 100 can be reduced, and the acoustic performance of the sound-emitting device 100 can be further improved.

[0048] In some optional embodiments of the present invention, the first shell 11 is entirely made of aerogel material.

[0049] That is to say, in addition to the sound absorbing part 113 being made of aerogel material as a whole, the first shell 11 is also made of aerogel material as a whole. This structure can form the sound absorbing part 113 and the first shell 11 as one piece, avoiding the separate molding of the first shell 11 and the sound absorbing part 113, thereby improving the preparation efficiency and ensuring the overall structural stability of the first shell 11.

[0050] Optionally, in some other specific embodiments of the present invention, the first shell 11 includes a frame 101 and a metal sheet 102 embedded in the frame 101, the metal sheet 102 is arranged opposite to the sound-emitting unit 20, the sound absorbing part 113 is arranged on the frame 101, and the frame 101 is made of aerogel material.

[0051] like Figure 2 As shown, in this embodiment, the first shell 11 is mainly composed of a frame 101 and a metal sheet 102, wherein the frame 101 constitutes the main structure of the first shell 11, and the frame 101 can be made of aerogel material, and the sound absorbing part 113 is formed at a part of the frame 101 away from the sound outlet 112. The metal sheet 102 is embedded in the frame 101, and the metal sheet 102 can be used to further enhance the strength of the first shell 11, thereby meeting the rigidity requirements of the housing 10.

[0052] According to one embodiment of the present invention, the skeleton of the aerogel comprises an organic polymer, and the organic polymer is at least one of polyimides, polyamides, polyesters, aldehydes, polyolefins, polysaccharides and silicones.

[0053] Specifically, aerogel refers to a nano-scale porous solid material formed by replacing the liquid phase in the gel with gas after drying through the sol-gel method, and the aerogel also has the properties of a gel. In the present application, the skeleton of the organic aerogel 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 certain strength compared to inorganic aerogel materials, and is suitable for making the shell 10 of a sound-generating device with certain mechanical requirements. In practical applications, one or more of the above-mentioned organic polymer materials can be selected according to the actual needs of the functional shell.

[0054] In some specific embodiments of the present invention, the sound absorbing part 113 further contains a reinforcing material, and the weight percentage of the reinforcing material to the total weight of the sound absorbing part 113 is 0-30%.

[0055] That is to say, the proportion of the reinforcing material in the sound absorbing part 113 can be 0, that is, the sound absorbing part 113 is made of aerogel material as a whole, and the sound absorbing part 113 can also be filled with reinforcing material, and the proportion of the reinforcing material in the sound absorbing part 113 can be 1%, 5%, 10%, 20%, 30%, etc.

[0056] Optionally, the reinforcing material is reinforcing fibers and / or reinforcing particles, wherein the reinforcing fibers are at least one of chopped fibers and continuous fibers, the fiber-based reinforcing material may also be fabric or non-woven fabric, and the reinforcing particles are at least one of inorganic particles such as boron nitride, silicon carbide, carbon black or metal particles.

[0057] The addition of reinforcement materials will increase the modulus of the product to a certain extent, and if the amount of reinforcement materials used is too low, the stiffness of the product will not be significantly improved. If the amount of reinforcement materials used is too high, although the stiffness of the product is significantly improved, it will affect the acoustic performance of the product. According to the housing 10 of the embodiment of the present invention, by selecting appropriate reinforcement fibers or reinforcement particles, the influence of the reinforcement materials on the acoustic performance can be reduced while ensuring the stiffness of the product.

[0058] According to some embodiments of the present invention, the sound absorbing part 113 further contains an acoustic improving material, and the mass percentage of the acoustic improving material to the total weight of the sound absorbing part 113 is 0-40%.

[0059] In other words, the proportion of the acoustic improvement material in the sound absorbing part 113 can be 0, that is, the sound absorbing part 113 is made of aerogel material as a whole, and the sound absorbing part 113 can also be filled with acoustic improvement material, and the proportion of the acoustic improvement material in the sound absorbing part 113 can be 1%, 5%, 10%, 20%, 30%, 40%, etc.

[0060] Optionally, the acoustic improvement material is at least one of zeolite, molecular sieve, activated carbon, MOFs, porous alumina and porous silica. The acoustic improvement material generally has a pore structure. By adding the acoustic improvement material in the sound absorbing part 113, the sound absorption effect of the sound absorbing part 113 can be further improved, thereby further improving the acoustic performance of the sound-generating device 100.

[0061] In some specific embodiments of the present invention, the sound absorbing part 113 is made of at least one of PC and its modified materials, PA and its modified materials, PPS and its modified materials, PP and its modified materials, ABS and its modified materials, LCP and its modified materials, PEI and its modified materials, phenolic resin and its modified materials, epoxy resin and its modified materials, unsaturated polyester and its modified materials, stainless steel and aluminum alloy, magnesium alloy and metal-based composite materials.

[0062] That is, the main body of the sound absorbing part 113 can be made of the above materials. According to the above embodiments of the present invention, the sound absorbing part 113 can be made in a variety of ways, which can meet the requirements of product rigidity and lightness while taking into account the impact on acoustic performance, and has strong practicality.

[0063] According to one embodiment of the present invention, the sound absorbing part 113 has an open-pored channel, and the porosity of the sound absorbing part 113 is 40%-95%, for example, 40%, 45%, 50%, 60%, 80%, 90%, etc.

[0064] Optionally, the pore size of the open channel is 50 nm-200 μm, for example, it can be 50 nm, 100 nm, 500 nm, 1 μm, 50 μm, 100 μm, 200 μm, etc.

[0065] By opening an open channel in the sound absorbing part 113, the open channel can reduce the propagation resistance of sound waves in the sound absorbing part 113 to a certain extent. If the porosity of the sound absorbing part 113 is too large, the overall modulus of the sound absorbing part 113 will be low, which is difficult to meet the rigidity requirements; and an increase in the aperture of the open channel will cause the structure of the shell 10 to be loose, and the resistance during the propagation of sound waves will be small, which is not conducive to the absorption loss of sound energy.

[0066] Therefore, according to the sound-emitting device 100 of the embodiment of the present invention, by opening a channel in the sound-absorbing part 113 and controlling the porosity of the sound-absorbing part 113 and the aperture of the opening channel, the sound-absorbing part 113 can improve the sound absorption effect on the basis of meeting the rigidity requirement of the shell 10.

[0067] In some specific embodiments of the present invention, the density of the sound absorbing part 113 is 0.2 g / cm 3 -1.0g / cm 3 Preferably, the density of the sound absorbing part 113 can be 0.3 g / cm 3 -0.8g / cm 3 For example, the density of the functional shell can be 0.2 g / cm 3 , 0.3g / cm 3 , 0.5g / cm 3 g, 0.6g / cm 3, 0.8g / cm 3 , 1.0g / cm 3 wait.

[0068] Since the density of the sound absorbing part 113 directly affects the weight of the sound absorbing part 113 and the shell 10 as a whole, if the density of the sound absorbing part 113 is too low, the stiffness of the sound absorbing part 113 will be low, and it will be difficult to meet the overall stiffness requirements of the shell 10; if the density of the sound absorbing part 113 is too high, the overall weight of the shell 10 will be large, which is not conducive to the lightweight design of the product. The present invention limits the density of the sound absorbing part 113 within a certain range, and on the basis of ensuring the stiffness requirements of the shell 10, it can also reasonably control the weight of the shell 10, further meeting the product design requirements.

[0069] Optionally, according to one embodiment of the present invention, the overall specific modulus of the sound absorbing part 113 is greater than 2 GPa·cm 3 Therefore, the sound-generating device 100 according to the embodiment of the present invention can not only ensure the modulus of the product but also avoid resonance by limiting the overall specific modulus of the sound-absorbing part 113, thereby improving the acoustic performance of the product.

[0070] For electronic devices such as mobile phones, considering that their SPK size is small and the front cavity size is also small, the resonance peak and valley are after 10KHz, and the interference of reflected waves has little effect on the listening experience. However, for devices such as VR, their SPK size is large, and the front cavity size is relatively narrow and long. The frequency point of the peak and valley appears in the mid-frequency 4kHz-8KHz, and the interference of reflected waves will obviously affect the user's listening experience.

[0071] Based on the above considerations, in some specific embodiments of the present invention, the distance between the end of the first shell 11 away from the sound outlet 112 and the center position of the sound unit 20 is not less than 8.5 mm.

[0072] Specifically, when the distance between the end of the first shell 11 away from the sound outlet 112 and the center of the sound-emitting unit 20 is about 8.5mm, a standing wave phenomenon will appear after 10KHz. In this frequency band, the human ear is not sensitive to sound and will not affect the listening effect. When the distance between the end of the first shell 11 away from the sound outlet 112 and the center of the sound-emitting unit 20 is greater than 8.5mm, a standing wave phenomenon will appear within 10KHz, which will seriously affect the user's listening experience. According to the sound-emitting device 100 of an embodiment of the present invention, by setting the distance between the end of the first shell 11 away from the sound outlet 112 and the center of the sound-emitting unit 20 to be greater than or equal to 8.5mm, the user's listening experience can be significantly improved.

[0073] An electronic device according to an embodiment of the present invention includes a sound-emitting device according to the above-mentioned embodiment, wherein the electronic device can be a mobile phone, a laptop computer, a tablet computer, a VR (virtual reality) device, an AR (augmented reality) device, a TWS (true wireless Bluetooth) headset, a smart speaker, etc., and this application does not impose any restrictions on this.

[0074] Since the sound-generating device 100 according to the above embodiment of the present invention has the above technical effects, the electronic device according to the embodiment of the present invention also has corresponding technical effects, that is, the sound absorption effect is better, which can effectively improve the overall hearing experience of the product.

[0075] The sound generating device 100 of the present invention is described in detail below with reference to specific embodiments and comparative examples.

[0076] Example

[0077] First, polyimide hydrogel is synthesized, and then reinforcing materials are added and mixed evenly. The reinforcing material is chopped carbon fiber, accounting for 25% by mass.

[0078] The polyimide hydrogel mixed with the reinforcing material is injected into the mold for compression molding, freeze-dried and then imidized to form a sound-absorbing part 113 with a sound-absorbing function. The overall thickness of the sound-absorbing part 113 is 0.5 mm, and the open-pore porosity is 45%. After the sound-absorbing part 113 is prepared, it is assembled with a plastic shell made of conventional materials to form the first shell 11. The sound-absorbing part 113 is combined with one end of the first shell 11 away from the sound outlet 112.

[0079] Comparative Example

[0080] In the comparative example, the specific preparation process of the first shell 11 is: PC+20% GF is used for integral injection molding of the front cavity shell of the module, and the thickness is 0.5 mm.

[0081] The sound generating devices 100 obtained in the embodiment and the comparative example were subjected to acoustic tests respectively, and the following results were obtained: Figure 3 The FR curve diagram shown in FIG. 1 shows a solid line representing the FR curve of the sound-generating device 100 using the aerogel material layer in the embodiment, and a dotted line representing the FR curve of the sound-generating device using the PC material in the comparative example. In the FR curve, the horizontal axis represents frequency (Hz) and the vertical axis represents loudness (dB).

[0082] Depend on Figure 3 It can be seen that the first shell 11 of the sound absorbing part 113 made of aerogel material in the embodiment can reduce standing waves and make the FR curve smoother, with a peak-to-valley difference of 23.8 dB.

[0083] In the comparative example, the first shell 11 made of PC material has its reflected waves superimposed on normal sound waves to form standing waves, which reduces the loudness of the sound-emitting device between 4KHz and 5KHz. The peak-to-valley difference of the FR curve frequency response is too large, reaching 31.4dB, affecting the overall listening experience.

[0084] It can be seen from the above comparison results that the sound-emitting device 100 according to the embodiment of the present invention, by providing a sound-absorbing portion 113 on the first shell 11 and providing an aerogel material layer on the surface of the sound-absorbing portion 113 facing the sound outlet 112, can reduce the reflected wave energy of the shell wall to the front sound cavity 111, thereby reducing the resonance peaks and valleys and improving the acoustic performance of the sound-emitting device.

[0085] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A sound-generating device, characterized in that: include: A shell, wherein a sound outlet is provided on a side wall of the shell, and the shell comprises a first shell and a second shell; A sound-generating unit, the sound-generating unit is arranged in the outer shell and forms a front sound cavity with the first shell, the front sound cavity is connected with the sound outlet; Wherein, at least one end of the first shell away from the sound outlet is provided with a sound absorbing part, and a surface of the sound absorbing part facing the sound outlet is provided with an aerogel material layer.

2. The sound generating device according to claim 1, characterized in that: At least the sound absorbing part is made of the aerogel material.

3. The sound-generating device according to claim 2, characterized in that: The first shell is entirely made of the aerogel material.

4. The sound generating device according to claim 2, characterized in that: The first shell includes a frame and a metal sheet embedded in the frame, the metal sheet is arranged opposite to the sound-emitting unit, the sound-absorbing part is arranged on the frame, and the frame is made of the aerogel material.

5. The sound generating device according to claim 1, characterized in that: The skeleton of the aerogel comprises an organic polymer, and the organic polymer is at least one of polyimides, polyamides, polyesters, aldehydes, polyolefins, polysaccharides and silicones.

6. The sound generating device according to claim 2, characterized in that: The sound absorbing part further contains a reinforcing material, and the weight percentage of the reinforcing material in the total weight of the sound absorbing part is 0-30%.

7. The sound generating device according to claim 6, characterized in that: The reinforcing material is reinforcing fiber and / or reinforcing particle, wherein the reinforcing fiber is at least one of chopped fiber and continuous fiber, and the reinforcing particle is at least one of inorganic particle boron nitride, silicon carbide, carbon black or metal particle.

8. The sound generating device according to claim 2, characterized in that: The sound absorbing part further contains an acoustic improving material, and the mass percentage of the acoustic improving material to the total weight of the sound absorbing part is 0-40%.

9. The sound generating device according to claim 8, characterized in that: The acoustic improvement material is at least one of zeolite, molecular sieve, activated carbon, MOFs, porous alumina and porous silica.

10. The sound generating device according to claim 2, characterized in that: The sound absorbing part is made of at least one of PC and its modified materials, PA and its modified materials, PPS and its modified materials, PP and its modified materials, ABS and its modified materials, LCP and its modified materials, PEI and its modified materials, phenolic resin and its modified materials, epoxy resin and its modified materials, unsaturated polyester and its modified materials, stainless steel and aluminum alloy, magnesium alloy and metal-based composite materials.

11. The sound generating device according to claim 1, characterized in that: The sound absorbing part has an open-cell channel, and the porosity of the sound absorbing part is 40%-95%.

12. The sound generating device according to claim 11, characterized in that: The pore size of the open channel is 50nm-200μm.

13. The sound generating device according to claim 2, characterized in that: The density of the sound absorbing part is 0.2 g / cm 3 -1.0g / cm 3 .

14. The sound generating device according to claim 2, characterized in that: The overall specific modulus of the sound absorbing part is greater than 2 GPa·cm 3 / g.

15. The sound generating device according to claim 1, characterized in that: The distance between an end of the first shell away from the sound outlet and a center position of the sound-emitting unit is not less than 8.5 mm.

16. An electronic device, characterized in that: Comprising a sound generating device according to any one of claims 1 to 15.

Images