Dome and preparation method thereof, diaphragm assembly, sound-generating device and electronic device

Abstract

The present invention discloses a dome, a preparation method thereof, a diaphragm assembly, a sound generating device and an electronic device. The dome includes an organic aerogel layer, the density of the dome is 0.03 g / cm<supgt;3< / supgt> to 1.2 g / cm<supgt;3< / supgt>, and the compressive modulus of the dome along its thickness direction is greater than 30 MPa. The dome provided by the present invention has characteristics such as low density and formability, enabling the sound generating device to obtain excellent low-frequency and mid-frequency performance. The dome of the present invention has a relatively large compressive modulus along its thickness direction, enabling the dome to have a light mass while also obtaining a stronger ability to resist compressive deformation, so as to ensure the structural stability of the sound generating device during use.

Description

Technical Field

[0001] The present invention relates to the field of acoustics, and more specifically, to a dome and a preparation method thereof, a diaphragm assembly, a sound-generating device and an electronic device. Background Art

[0002] Micro speakers are mostly used in electronic devices such as mobile phones and headphones, and are mostly used for making calls, playing music, playing videos, etc. Since the frequency response range of human voice and most musical instruments is mostly in the low and medium frequency range of 30-5000Hz, in order to obtain better sound clarity, brightness and strength, the speaker needs to have a lower resonant frequency (F0) and higher medium frequency sensitivity.

[0003] In the related art, in order to improve the strength of the dome, the dome is mostly made of metal foil or engineering plastic materials. The density of metal foil and engineering plastic is relatively high, which will increase the mass of the dome, and further cause problems such as large mass of the speaker vibration system and low mid-frequency sensitivity, making the sound of the speaker not clear and full enough, affecting the sound effect of the speaker. Summary of the invention

[0004] An object of the present invention is to provide a new technical solution for a dome and a method for preparing the dome, a diaphragm assembly, a sound-generating device and an electronic device to solve at least one problem in the background technology.

[0005] According to a first aspect of the present invention, a dome is provided for use in a sound-generating device. The dome comprises an organic aerogel layer. The density of the dome is 0.03 g / cm 3 ~1.2g / cm 3 The compression modulus of the dome along its thickness direction is greater than 30 MPa.

[0006] Optionally, the density of the dome is 0.05 g / cm 3 ~0.3g / cm 3 .

[0007] Optionally, the thickness of the dome is 10 μm to 500 μm.

[0008] Optionally, the bending modulus of the dome is 30 MPa to 600 MPa.

[0009] Optionally, the organic aerogel layer is a material layer having a porous structure and is made of one or more of polyamides, polyimides, polyesters, polyurethanes, aldehydes, polyolefins, and polysaccharides.

[0010] Optionally, the dome is formed as a single-layer structure, and the dome is composed of a single layer of the organic aerogel layer;

[0011] Alternatively, the dome is formed into a composite layer structure, the dome includes the organic aerogel layer and a substrate layer arranged on one side of the organic aerogel layer, and the substrate layer is made of one of metal and its alloy foil and engineering plastic.

[0012] Optionally, the dome is formed as a composite layer structure, and the thickness of the substrate layer is greater than or equal to 3 μm.

[0013] Optionally, the dome is formed as a composite layer structure, and a thickness ratio of the substrate layer to the organic aerogel layer is less than or equal to 1:5.

[0014] According to a second aspect of the present invention, a method for preparing a dome is provided, which is applied to the dome with a single-layer structure as described in the first aspect, wherein the dome is composed of a single layer of the organic aerogel layer, and the preparation method comprises:

[0015] preparing an organic hydrogel, and hot-pressing the organic hydrogel to obtain an organic hydrogel spherical top;

[0016] The formed organic hydrogel spherical top is freeze-dried to obtain a formed organic aerogel spherical top.

[0017] Optionally, when preparing the organic hydrogel dome, the preparation method further comprises: adding a cross-linking initiator into the hydrogel, wherein the cross-linking initiator is at least one of polyisocyanates, polyamines, polyols, glycidyl ethers and aziridines.

[0018] Optionally, after the formed organic aerogel spherical top is obtained, the preparation method further comprises: heating and cross-linking the formed organic aerogel spherical top, and the temperature range of the heating and cross-linking is 80-400°C.

[0019] According to a second aspect of the present invention, another method for preparing a dome is provided, which is applied to the dome formed into a layered structure according to the first aspect, and the method comprises:

[0020] preparing an organic hydrogel, and spraying the organic hydrogel on the surface of a formed substrate to obtain a substrate layer with the organic hydrogel coated on the surface;

[0021] The substrate layer and the organic hydrogel on the surface thereof are freeze-dried to obtain an organic aerogel spherical top having a substrate layer.

[0022] Optionally, when preparing the organic hydrogel, the preparation method further comprises: adding a cross-linking initiator into the hydrogel, wherein the cross-linking initiator is at least one of polyisocyanates, polyamines, polyols, glycidyl ethers and aziridines.

[0023] Optionally, after the organic aerogel dome with the substrate layer is obtained, the preparation method further comprises: heating and cross-linking the organic aerogel dome with the substrate layer, and the temperature range of the heating and cross-linking is 80-400°C.

[0024] Optionally, the freeze-drying conditions are: temperature less than or equal to 5°C, and vacuum degree less than or equal to 50Pa.

[0025] According to a third aspect of the present invention, a diaphragm assembly is provided for use in a sound-generating device, comprising: a diaphragm and a dome of the sound-generating device described in the first aspect, wherein the dome is bonded to the diaphragm, or the dome is integrally injection-molded with the diaphragm.

[0026] According to a fourth aspect of the present invention, there is provided a sound-generating device, comprising: the diaphragm assembly described in the third aspect.

[0027] According to a fifth aspect of the present invention, there is provided an electronic device, comprising: the sound-generating device according to the fourth aspect.

[0028] According to one embodiment of the present invention, a technical effect of the present invention is:

[0029] The present invention uses an organic aerogel material with a crisscross porous network structure as the preparation material of the dome, and its low density and formability can make the dome have the advantage of light weight, so that the sound-generating device can obtain excellent low-frequency and medium-frequency performance. In addition, by limiting the compression modulus of the dome along its thickness direction, the dome has a light weight and can also obtain a stronger ability to resist compression deformation, so as to ensure the structural stability of the sound-generating device during use.

[0030] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0032] Figure 1 It is a schematic structural diagram of a spherical top diaphragm assembly including an organic aerogel layer provided by the present invention.

[0033] Figure 2 It is a schematic structural diagram of another spherical top diaphragm assembly provided by the present invention that includes an organic aerogel layer.

[0034] Figure 3 It is a schematic structural diagram of a spherical top diaphragm assembly provided by the present invention, comprising an organic aerogel layer and a substrate layer.

[0035] Figure 4 The invention provides a method for preparing a dome (single-layer dome).

[0036] Figure 5 The invention provides another method for preparing a dome (composite layer dome).

[0037] Figure 6 It is a comparison diagram of the frequency response curves of each housing in the embodiment of the present invention, embodiment 2 and the comparative example.

[0038] Description of reference numerals:

[0039] 1. Dome; 11. Organic aerogel layer; 12. Base material layer; 2. Diaphragm. DETAILED DESCRIPTION

[0040] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0042] 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 as part of the specification.

[0043] 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.

[0044] 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.

[0045] like Figures 1 to 3 As shown, according to a first aspect of the present invention, a dome 1 is provided, which is applied to a sound-generating device. The dome 1 comprises an organic aerogel layer 11, and the density of the dome 1 is 0.03 g / cm 3 ~1.2g / cm 3 The compression modulus of the dome 1 along its thickness direction is greater than 30 MPa.

[0046] Specifically, the dome 1, as a part of the diaphragm assembly, is usually arranged at the center of the diaphragm 2 to enhance the strength of the diaphragm 2. Therefore, the various properties of the dome 1 have a certain influence on the sound performance of the entire sound-generating device. In some sound-generating devices, the dome 1 needs to meet the requirements of low density, formability, high strength and other performances at the same time.

[0047] In this embodiment, an organic aerogel layer 11 is used as the substrate of the dome 1. The organic aerogel is a type of aerogel prepared from high molecular organic materials, and has many criss-cross porous network structures inside. The porous network structure makes the organic aerogel layer have a low density characteristic compared to traditional dome materials, such as metal foil and engineering materials. Under the same size conditions, the organic aerogel layer can minimize the mass of the dome 1, thereby achieving the technical effect of reducing the resonant frequency of the sound-emitting device and improving the intermediate frequency sensitivity of the sound-emitting device.

[0048] The density of the dome 1 has a great influence on the acoustic performance of the sound-generating device. If the density of the dome 1 is too high, the overall mass of the dome 1 will be too high, thereby affecting the mid-frequency sensitivity of the sound-generating device. If the density is too low, the overall rigidity of the dome 1 will be insufficient, which is not conducive to vibration. In the present invention, the organic aerogel layer 11 is used as the substrate of the dome 1, so that the overall density of the dome 1 can be maintained at 0.03 g / cm 3 ~1.2g / cm 3 For example, the overall density can be 0.03 g / cm 3 , 0.05g / cm 3 , 0.08g / cm 3 , 0.1g / cm 3 , 0.2g / cm 3 , 0.5g / cm 3 , 0.6g / cm 3 , 0.8g / cm 3 , 1.0g / cm 3 and 1.2 g / cm 3 etc., to meet the performance requirements of light weight and high rigidity of the dome 1.

[0049] In addition, during the actual sounding process of the sound-generating device, the dome 1 needs to have a certain ability to resist compression deformation in the thickness direction, that is, the dome 1 has a strong ability to resist longitudinal deformation to ensure the structural stability of the sound-generating device during use. The compression modulus of the dome 1 including the organic aerogel layer 11 can be maintained above 30MPa, such as 50MPa, 60MPa, 80MPa, 100MPa, 200MPa, 300MPa, etc., which improves the ability of the dome 1 to resist compression deformation while ensuring the quality of the dome 1. The application of this dome 1 in the sound-generating device can enable the sound-generating device to obtain a better sounding effect.

[0050] The dome 1 provided by the present invention can be formed only by the organic aerogel layer 11, referring to Figure 1 to Figure 2 , a composite structure can also be formed by the organic aerogel layer 11 and other substrate layers 12, referring to Figure 3 , which can be specifically selected according to the needs of the sound-generating device, and the present invention does not limit this. Among them, the organic aerogel layer 11 can only include organic aerogel materials, and various auxiliary materials can also be added to enhance other properties of the dome 1. When the dome 1 is composed of only the organic aerogel layer 11, the density of the dome 1 is the density of the organic aerogel layer 11. When the dome 1 is a composite structure, the density of the dome 1 can be maintained within a suitable range by adjusting the density of the organic aerogel and the density of other substrate layers 12.

[0051] Preferably, the density of the dome 1 is 0.05 g / cm 3 ~0.3g / cm 3 For example, 0.05 g / cm 3 , 0.06g / cm 3 , 0.08g / cm 3 , 0.09g / cm 3 , 0.1g / cm 3 , 0.15g / cm 3 , 0.2g / cm 3 , 0.25g / cm 3 , 0.3g / cm 3 In particular, when the density of the dome 1 is 0.05 g / cm 3 and 0.08g / cm 3 When the density of the dome 1 is 0.25 g / cm 3 and 0.3g / cm 3 When the density of the dome 1 is relatively large, the compression modulus of the dome can be further improved, and the diaphragm 2 can better express the vibration, so that the sound-emitting device can achieve better acoustic effects.

[0052] Optionally, the spherical top 1 has a thickness of 10 μm to 500 μm.

[0053] Specifically, the thickness of the dome 1 will affect the vibration space of the vibration component in the sound-generating device. If the thickness of the dome 1 is too large, the vibration space of the vibration component will be reduced, and the maximum amplitude that can be achieved will also be reduced, thereby affecting the sound-generating effect. If the thickness of the dome 1 is too small, although a part of the vibration space can be increased, the overall mechanical strength of the vibration component will be reduced, affecting the high-frequency sensitivity of the sound-generating device. In this embodiment, an organic aerogel layer 11 containing a porous network structure is used as at least a part of the dome 1, so that the thickness of the dome 1 can be maintained at 10μm to 500μm, so that the dome 1 can simultaneously control the vibration space of the vibration component and the high-frequency sensitivity of the sound-generating device. Preferably, the thickness of the dome 1 is 30μm to 300μm. For example, 30μm, 40μm, 50μm, 80μm, 90μm, 100μm, 150μm, 200μm, 250μm and 300μm, etc.

[0054] In particular, when the thickness of the dome 1 is 30μm and 50μm, the mass of the dome 1 is relatively small, and the weight reduction effect of the dome 1 is outstanding, which is suitable for sound-generating devices with strict quality requirements on the diaphragm assembly. When the thickness of the dome 1 is 100μm and 150μm, the mass of the dome 1 is relatively large, which can further improve the compression modulus of the dome, cooperate with the diaphragm 2 to better express the vibration, and enable the sound-generating device to achieve better acoustic effects.

[0055] Optionally, the bending modulus of the dome 1 is 30 MPa to 600 MPa.

[0056] Specifically, during the use of the sound-generating device, the stronger the anti-bending deformation ability of the dome 1 is, the less likely the dome 1 is to deform during the vibration process. The dome 1 prepared by using the organic aerogel layer 11 has a bending modulus of 30MPa to 600MPa, which reduces the risk of excessive deformation of the dome 1 during the vibration process, avoids the phenomenon of polarization of the sound-generating component or split vibration under high-frequency vibration, and improves the sound performance of the sound-generating device. Preferably, the bending modulus is 100MPa to 600MPa. For example, 100MPa, 200MPa, 300MPa, 400MPa, 500MPa and 600MPa.

[0057] The bending modulus and compression modulus of the dome 1 have a great influence on the structural stability of the dome 1. When the compression modulus of the dome 1 is 50MPa or 80MPa and the bending modulus is 100MPa or 200MPa, the dome 1 can exhibit excellent anti-deformation ability, while also being able to keep the density of the dome 1 within a small range, thereby improving the structural stability of the dome 1 while reducing the mass of the dome 1. The higher the structural stability of the dome 1, the better the sound effect of the sound-generating device.

[0058] Optionally, the organic aerogel layer 11 is a material layer having a porous structure and made of one or more of polyamides, polyimides, polyesters, polyurethanes, aldehydes, polyolefins, and polysaccharides.

[0059] Specifically, in practical applications, the organic aerogel layer 11 can be made of one material selected from the group consisting of polyamides, polyimides, polyesters, polyurethanes, aldehydes, polyolefins, and polysaccharides, or a combination of several materials, which is not limited in the present invention. The organic aerogel layer 11 made of the above materials has a porous structure, so that the organic aerogel layer 11 is light in weight and has a large modulus. Different types of organic aerogels also have different properties, which can be selected specifically according to the use environment of the dome 1. For example, in one embodiment, the molecular chain of the polyamide aerogel contains a rigid segment benzene ring. The dome 1 made of the polyamide aerogel has not only good mechanical properties, but also good high and low temperature resistance.

[0060] Optionally, the dome 1 is formed as a single-layer structure, and the dome 1 is composed of a single layer of the organic aerogel layer 11; or, the dome 1 is formed as a composite layer structure, and the dome 1 includes the organic aerogel layer 11 and a substrate layer 12 arranged on one side of the organic aerogel layer 11, and the substrate layer 12 is made of one of metal and its alloy foil and engineering plastic.

[0061] Specifically, in one embodiment, the dome 1 is composed of a single-layer organic aerogel layer 11, which has a porous structure and a high modulus, so that the dome 1 has the properties of light weight and non-deformability, thereby improving the low-frequency and mid-frequency sensitivity of the sound-emitting device.

[0062] In another embodiment, the dome 1 can also be a composite layer structure, that is, the dome 1 includes an organic aerogel layer 11 and a substrate layer 12. Among them, the provision of the substrate layer 12 can make the dome 1 easy to shape and improve production efficiency. For example, in the process of preparing the dome 1, metal can be used for stamping or engineering plastics can be used for hot pressing, and then the organic aerogel can be coated on the substrate layer 12, which reduces the process difficulty and improves production efficiency. In addition, the metal and its alloy foil can be aluminum and aluminum alloy foil, copper and copper alloy foil, magnesium and magnesium alloy foil or titanium and titanium alloy foil. Engineering plastics can be polyester film, polyethylene terephthalate film, polyetheretherketone film or liquid crystal polymer film.

[0063] Optionally, the dome 1 is formed as a composite layer structure, and the thickness of the substrate layer 12 is greater than or equal to 3 μm. Alternatively, the thickness ratio of the substrate layer 12 to the organic aerogel layer 11 is less than or equal to 1:5.

[0064] Specifically, the addition of the substrate layer 12 can not only provide a certain support effect on the dome 1, but also facilitate the processing and molding of the organic aerogel layer 11. However, if the substrate layer 12 is too thick, or the ratio of its thickness to the thickness of the organic aerogel is too large, it will cause the mass of the dome 1 to increase, reduce the sensitivity of the intermediate frequency, and affect the sound effect of the sound-generating device. If the substrate layer 12 is too thin, or the ratio of its thickness to the thickness of the organic aerogel is too small, it will lose its support effect on the dome 1 and reduce the molding performance of the organic aerogel. Optionally, the thickness of the substrate layer 12 can be 3μm, 5μm, 10μm, 12μm, 15μm and 20μm, etc., and the thickness of the organic aerogel layer 11 can be 15μm, 25μm and 50μm, etc. Optionally, the thickness ratio of the substrate layer 12 to the organic aerogel layer 11 can be 1 / 5, 1 / 6, 1 / 7, 1 / 8 and 1 / 9, etc.

[0065] The present invention also provides a method for preparing a dome 1, which is applied to the dome of the organic aerogel single-layer structure in any of the above embodiments, referring to Figure 1 to Figure 2 as well as Figure 5 The preparation method comprises: preparing an organic hydrogel, and hot-pressing the organic hydrogel to obtain an organic hydrogel spherical top; freeze-drying the formed organic hydrogel spherical top to obtain a formed organic aerogel spherical top. The spherical top 1 prepared by the preparation method is an integrated molding structure, and its thickness consistency is good, which is conducive to improving the sound performance of the sound-generating device. The specific preparation steps are as follows:

[0066] According to the type of organic aerogel ultimately required, the corresponding organic hydrogel is prepared, and an appropriate amount of the prepared organic hydrogel is placed in the upper and lower molds of the spherical top, and the molds are placed on a hot pressing molding machine for hot pressing molding, wherein the temperature of the hot pressing molding can usually be set to 60°C; the molded product is taken out and cooled to obtain the organic hydrogel spherical top, which now contains a large amount of water.

[0067] The organic hydrogel is freeze-dried. During the freeze-drying process, the organic hydrogel loses its internal moisture to form an organic aerogel dome with an interlaced network structure. The freeze-drying conditions are: the temperature is less than or equal to 5°C, and the vacuum degree is less than or equal to 50Pa. For example, the freeze-drying atmosphere temperature can be set to -50°C and the vacuum degree is 80Pa.

[0068] Optionally, when preparing the organic hydrogel dome, the preparation method further comprises: adding a cross-linking initiator into the hydrogel, wherein the cross-linking initiator is at least one of polyisocyanates, polyamines, polyols, glycidyl ethers and aziridines.

[0069] Specifically, in the above preparation method, a cross-linking initiator can also be added when preparing the organic hydrogel dome 1. The addition of the cross-linking initiator can promote the chemical cross-linking reaction of the organic hydrogel, so that the organic aerogel dome finally formed has more pore structures, and the pore structure distribution can be more uniform, thereby reducing the density of the organic aerogel layer 11 and reducing the mass of the dome 1. Among them, the type of the cross-linking initiator can be selected accordingly according to the type of the selected organic aerogel, and one of the above cross-linking initiators can be selected, or several combinations can be used, and the present invention does not limit this.

[0070] Optionally, after the formed organic aerogel spherical top is obtained, the preparation method further comprises: heating and cross-linking the formed organic aerogel spherical top, and the temperature range of the heating and cross-linking is 80-400°C.

[0071] Specifically, in another embodiment, in order to make the final dome 1 containing the organic aerogel layer 11 have a higher compression modulus and more and more evenly distributed pore structures, the formed organic aerogel dome 1 can also be heated and cross-linked after it is obtained. The temperature of heating and cross-linking can be adjusted in the range of 80 to 400°C according to the material type of aerogel selected for the organic aerogel layer 11, and the heating tool can be an oven, etc. In addition, during the heating and cross-linking process, the cross-linking temperature can be kept at a constant temperature or at different temperatures. For example, the heating and cross-linking temperature can be set to 180°C for 1 hour and 350°C for 4 hours to make the cross-linking reaction more sufficient.

[0072] The present invention also provides a method for preparing a dome 1 having a composite layer structure, referring to Figure 3 and Figure 5 The preparation method comprises: preparing an organic hydrogel, and spraying the organic hydrogel on the surface of a formed substrate to obtain a substrate layer 12 with an organic hydrogel coated on the surface; freeze-drying the substrate layer 12 and the organic hydrogel on the surface to obtain an organic aerogel dome 1 having the substrate layer 12. In this embodiment, the structure of the dome 1 comprises a substrate layer 12 and an organic aerogel layer 11. In this embodiment, the organic aerogel layer 11 is directly sprayed on the surface of the substrate layer 12, which simplifies the molding process of the organic aerogel layer 11, and has high structural strength and dimensional accuracy. The specific preparation steps are as follows:

[0073] Select appropriate materials to prepare the substrate layer 12 of the dome 1, and select appropriate material types to prepare the organic hydrogel. The substrate layer 12 can be prepared by hot pressing. The substrate layer 12 can support the entire dome 1 on the one hand, and provide an attachment skeleton for the organic aerogel layer 11 on the other hand, thereby eliminating the molding step of the organic aerogel layer 11.

[0074] The prepared organic hydrogel is sprayed on the surface of the formed substrate layer 12, wherein the thickness of the substrate layer 12 is set to be greater than or equal to 3 μm, and the thickness ratio of the substrate layer 12 to the thickness of the organic aerogel finally formed is set to be less than or equal to 1:5. For example, the substrate layer 12 can be set to 12 μm, and the organic aerogel layer finally formed can be set to 60 μm, so as to ensure the density of the finally formed dome 1 and the compression modulus along its thickness direction.

[0075] The substrate layer 12 coated with the organic hydrogel obtained in the above steps is first placed in a low temperature environment, and then freeze-dried after the organic hydrogel solidifies. During the freeze-drying process, the organic hydrogel on the surface of the substrate layer 12 loses its internal moisture to form an interlaced network structure, thereby obtaining an organic aerogel dome having the substrate layer 12. The freeze-drying conditions are: the temperature is less than or equal to 5°C, and the vacuum degree is less than or equal to 50 Pa. For example, the freeze-drying atmosphere temperature can be set to -50°C, and the vacuum degree is 80Pa.

[0076] Optionally, when preparing the organic hydrogel, the preparation method further comprises: adding a cross-linking initiator into the hydrogel, wherein the cross-linking initiator is at least one of polyisocyanates, polyamines, polyols, glycidyl ethers and aziridines.

[0077] In the above preparation method, a crosslinking initiator can also be added when preparing the organic hydrogel. The addition of the crosslinking initiator can promote the chemical crosslinking reaction of the organic aerogel. The crosslinking initiator forms chemical bonds between the polyimide molecular chains, so that the linear molecules are connected to each other to form a network structure, thereby improving the modulus and strength of the polyimide aerogel. Among them, the type of the crosslinking initiator can be selected accordingly according to the type of the selected organic aerogel. One of the above crosslinking initiators can be selected, or several can be used in combination, and the present invention does not limit this.

[0078] Optionally, after the organic aerogel dome with the substrate layer 12 is obtained, the preparation method further comprises: heating and crosslinking the organic aerogel dome with the substrate layer 12, and the temperature range of the heating and crosslinking is 80-400°C.

[0079] In another embodiment, in order to make the organic aerogel layer 11 in the organic aerogel dome 1 with the substrate layer 12 have a higher compression modulus and more and more evenly distributed pore structures, the organic aerogel dome 1 with the substrate layer 12 can also be heated and cross-linked after it is obtained. The temperature of heating and cross-linking can be adjusted in the range of 80 to 400°C according to the material type of aerogel selected for the organic aerogel layer 11, and the heating tool can be an oven or the like. In addition, during the heating and cross-linking process, the cross-linking temperature can be kept at a constant temperature or at different temperatures. For example, the heating and cross-linking temperature can be set to 180°C for 1 hour and 350°C for 4 hours to make the cross-linking reaction more sufficient.

[0080] The present invention also provides a diaphragm assembly for use in a sound-generating device, comprising: a diaphragm 2 and a dome 1 of the sound-generating device described in any of the above embodiments, wherein the dome 1 is bonded to the diaphragm 2 or the dome 1 and the diaphragm 2 are integrally injection molded.

[0081] Specifically, the dome 1 can be bonded to the diaphragm 2 by glue or the like, which is easy to implement in terms of technology and has low cost. The dome 1 can also be integrally injection molded with the diaphragm 2, which has high structural stability and avoids polarization of the diaphragm 2 component during the sound-generating process of the sound-generating device. Among them, the diaphragm 2 can be made of engineering plastics, such as polyetheretherketone (PEEK), PAR, etc., or made of elastomeric materials, such as thermoplastic polyurethane elastomer (TPU), thermoplastic polyester elastomer (TPEE), rubber, etc., and can also be made of adhesive film, such as acrylic adhesive, silicone adhesive, etc.

[0082] In another embodiment, the diaphragm 2 can also be made of a composite of the above-mentioned materials, and the present invention is not limited thereto. In addition, the thickness of the diaphragm 2 can be set between 0.01 mm and 0.5 mm, for example, 0.01 mm, 0.05 mm, 0.1 mm, 0.3 mm, and 0.5 mm.

[0083] The present invention also provides a sound-generating device, comprising a diaphragm assembly in any of the above embodiments. The above diaphragm assembly is applied to the sound-generating device, and since its dome 1 has an organic aerogel layer 11, which has the characteristics of low density and formability, the mass of the entire diaphragm assembly is relatively light, and during the vibration process, the sound-generating device is assisted to obtain better low-frequency performance and mid-frequency sensitivity.

[0084] The present invention also provides an electronic device, including the sound-generating device in any of the above embodiments. When the above-mentioned sound-generating device is applied to various electronic devices, the mass of the electronic device can be reduced. The present invention does not limit the electronic devices such as mobile phones, laptops, tablet computers, VR (virtual reality) devices, AR (augmented reality) devices, TWS (true wireless Bluetooth) headphones, smart speakers, etc.

[0085] In order to make the technical scheme and corresponding technical effects of the present invention clearer, the present invention specifically provides the following embodiments and comparative examples to specifically illustrate the technical scheme.

[0086] Embodiment 1:

[0087] refer to Figure 1 to Figure 2 ,as well as Figure 4 This embodiment provides a dome structure 1 having a single-layer organic aerogel layer 11, and the specific preparation method is as follows:

[0088] Step 1: Take 5 mg of organic hydrogel (i.e., wet gel), place it between the upper and lower molds of the ball top, and place the mold on a hot pressing molding machine, hot press molding at 60°C, and take it out after cooling to obtain the organic hydrogel ball top. The organic hydrogel is made of polyimide material.

[0089] Step 2: Place the organic hydrogel spherical top prepared in the first step in a -50°C atmosphere for freeze drying to obtain a formed organic aerogel spherical top.

[0090] Step 3: Place the formed organic aerogel dome in an oven and perform thermal crosslinking (180°C / 1h, 350°C / 4h) by programmed temperature rise to obtain a dome 1 having a single-layer organic aerogel layer 11 (hereinafter referred to as single-layer dome 1). The thickness of the single-layer dome 1 is set to 100 μm, and the density is set to 0.3 g / cm 3 , the compression modulus along its thickness direction is set to 50MPa.

[0091] Embodiment 2:

[0092] This embodiment provides a dome 1 with a composite layer structure, and the specific preparation method is as follows:

[0093] Step 1: Prepare an organic hydrogel and form a substrate layer 12. The organic hydrogel is made of polyimide material, and the substrate layer 12 is made of polyethylene naphthalate (PEN). The thickness of the substrate layer 12 is 12 μm.

[0094] Step 2: Take 5 mg of the organic hydrogel and spray it on the surface of the formed substrate layer 12 to obtain the substrate layer 12 coated with the organic hydrogel on the surface, and place the substrate layer 12 coated with the organic hydrogel on the surface in an atmosphere of -50°C for freeze drying. During the freeze drying process, the organic hydrogel on the surface of the substrate layer 12 loses its internal moisture to form an interlaced network structure, thereby obtaining an organic aerogel spherical top with the substrate layer 12.

[0095] Step 3: Place the organic aerogel dome with the substrate layer 12 in an oven and perform thermal crosslinking (180°C / 1h, 350°C / 4h) by program temperature rise to obtain a dome 1 with a composite layer structure. The thickness of the dome 1 with the composite layer structure is the same as that of the single-layer dome 1 obtained in Example 1, both of which are set to 100 μm. The density of the dome 1 with the composite layer structure is set to 0.8 g / cm 3 , the compression modulus along its thickness direction is set to 80MPa.

[0096] Comparative Example:

[0097] In this comparative example, a dome made of polyethylene naphthalate (PEN) (hereinafter referred to as PEN dome) is provided, the thickness of which is the same as that of the domes provided in Examples 1 and 2, both of which are 100 μm, and the density is 1.36 g / cm 3 .

[0098] The thickness, density and mass of the domes in the above-mentioned Example 1, Example 2 and the comparative example were tested, and the results are shown in Table 1 below:

[0099] Table 1 Comparison of various parameters of the dome

[0100] Thickness(μm) <![CDATA[Density (g / cm 3 )]]> Mass(mg) Sensitivity (@1000Hz / dB) Example 1 100 0.3 1.06 83.6 Example 2 100 0.8 2.8 83.3 Comparative Example 100 1.36 4.8 83.0

[0101] As shown in Table 1, the mass of the single-layer dome 1 provided in Example 1 is 1.06 mg; the mass of the dome 1 with a composite layer structure provided in Example 2 is 2.8 mg; and the mass of the PEN dome 1 in the comparative example is 4.8 mg, and the dome in the comparative example is 3.74 mg heavier than the domes in Example 1 and 2 mg heavier, respectively. This shows that when preparing a dome 1 with the same thickness, the dome 1 with an organic aerogel layer 11 in the present invention has a lower density, thereby achieving a lighter mass.

[0102] Further, the dome 1 in Example 1, Example 2 and the comparative example are respectively assembled with the diaphragm made of the same polyurethane film to form a diaphragm assembly, referring to Figures 1 to 3 , and further assembled into a sound-generating device of the same model to test its acoustic performance. The resulting frequency response (FR) curve is shown in the figure below: Figure 6 As shown. Among them, the horizontal axis of the frequency response curve is frequency (Hz), and the vertical axis is loudness (dB). The higher the loudness, the higher the sensitivity. Figure 6 It can be seen that the sensitivity of the sound-generating devices made of each dome at 1000 Hz is shown in Table 1.

[0103] Combination Figure 6 As can be seen from the sensitivity values ​​in Table 1, the sound-generating device made of the single-layer dome 1 obtained in Example 1 has the highest sensitivity, and its sensitivity is 0.6 dB higher than that of the comparative example at 1000 Hz. The dome 1 with a composite layer structure obtained in Example 2 also has a higher sensitivity than that of the comparative example, and its sensitivity is 0.3 dB higher than that of the comparative example at 1000 Hz.

[0104] In summary, it can be seen that the diaphragm assembly made of the dome 1 with the organic aerogel layer 11 provided by the present invention improves the low-frequency and medium-frequency sensitivity of the sound-generating device and improves the acoustic effect.

[0105] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0106] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may 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 dome, used in a sound-generating device, characterized in that: The dome is formed into a composite layer structure, comprising an organic aerogel layer and a substrate layer arranged on one side of the organic aerogel layer. The density of the dome is 0.03 g / cm 3 ~1.2g / cm 3 The thickness of the dome is 10 μm to 500 μm, the compression modulus of the dome along its thickness direction is greater than 30 MPa, and the bending modulus of the dome is 30 MPa to 600 MPa.

2. The dome according to claim 1, characterized in that: The density of the dome is 0.05 g / cm 3 ~0.3g / cm 3 .

3. The dome according to claim 1, characterized in that: The organic aerogel layer is a material layer with a porous structure made of one or more of polyamides, polyimides, polyesters, polyurethanes, aldehydes, polyolefins, and polysaccharides.

4. The dome according to claim 1, characterized in that: The substrate layer is made of one of metal and its alloy foil and engineering plastic.

5. The dome according to claim 1, characterized in that: The thickness of the substrate layer is greater than or equal to 3 μm.

6. The dome according to claim 1, characterized in that: The thickness ratio of the substrate layer to the organic aerogel layer is less than or equal to 1:

5.

7. A method for preparing a dome, applied to the dome according to any one of claims 1 to 6, characterized in that: The preparation method comprises: preparing an organic hydrogel, and spraying the organic hydrogel on the surface of a formed substrate to obtain a substrate layer with the organic hydrogel coated on the surface; The substrate layer and the organic hydrogel on the surface thereof are freeze-dried to obtain an organic aerogel spherical top having a substrate layer.

8. The method for preparing a dome according to claim 7, characterized in that: When preparing the organic hydrogel, the preparation method further comprises: adding a crosslinking initiator into the hydrogel, wherein the crosslinking initiator is at least one of polyisocyanates, polyamines, polyols, glycidyl ethers and aziridines.

9. The method for preparing a dome according to claim 7, characterized in that: After the organic aerogel dome with the substrate layer is obtained, the preparation method further comprises: heating and crosslinking the organic aerogel dome with the substrate layer, and the temperature range of the heating and crosslinking is 80-400°C.

10. The method for preparing a dome according to claim 7, characterized in that: The freeze-drying conditions are: temperature less than or equal to 5°C, and vacuum degree less than or equal to 50Pa.

11. A diaphragm assembly, applied to a sound-generating device, characterized in that: include: A diaphragm and a dome of the sound-generating device according to any one of claims 1 to 6, wherein the dome is bonded to the diaphragm, or the dome and the diaphragm are integrally injection-molded.

12. A sound-generating device, characterized in that: include: The diaphragm assembly as claimed in claim 11.

13. An electronic device, characterized in that: include: The sound-generating device according to claim 12.

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