Dome for sound-generating device, diaphragm assembly, sound-generating device and electronic equipment

Abstract

The present invention discloses a dome, a diaphragm assembly, a sound-generating device, and an electronic device for a sound-generating device; wherein the dome includes a heat-conducting layer and a heat-dissipating layer formed outside the heat-conducting layer; the heat-conducting layer includes at least an organic aerogel material and a heat-conducting filler, the organic aerogel material is oriented in a direction perpendicular to the surface of the dome, and the heat-conducting filler is added to the organic aerogel material and arranged along the orientation direction of the organic aerogel material. The dome of the present invention uses an organic aerogel material to reduce its own mass. Moreover, the present invention adds a heat-conducting filler to the organic aerogel material so that the heat-conducting filler is arranged along the orientation direction of the organic aerogel material, so that the heat can be transferred to the heat-dissipating layer outside the heat-conducting layer, thereby improving the heat dissipation efficiency of the dome.

Description

Technical Field

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

[0002] In order to improve the high-frequency response of the sound device and increase the cutoff frequency, the dome material is usually required to be light and rigid. As the amplitude of the sound device becomes larger and the voltage becomes higher, the voice coil does more work, and the heat generated by the voice coil during operation increases significantly, which will cause the temperature inside the sound device to reach above 130°C. The dome is usually in contact with the voice coil, so the heat conduction and heat dissipation of the dome become particularly important.

[0003] In the related art, metal materials are often used to make the dome of the sound-generating device. Although metal materials can solve the heat conduction and heat dissipation problems of the dome, metal materials generally have a high density, resulting in a large mass of the dome, thereby affecting the mid-frequency performance of the sound-generating device. Summary of the invention

[0004] The purpose of the present invention is to provide a new technical solution for a dome, a diaphragm assembly, a sound-generating device and an electronic device.

[0005] According to a first aspect of the present invention, there is provided a dome for a sound-generating device, the dome comprising a heat-conducting layer and a heat-dissipating layer formed outside the heat-conducting layer;

[0006] The heat-conducting layer at least comprises an organic aerogel material and a heat-conducting filler. The organic aerogel material is oriented in a direction perpendicular to the surface of the spherical top. The heat-conducting filler is added into the organic aerogel material and arranged along the orientation direction of the organic aerogel material.

[0007] Optionally, the thermal radiation coefficient of the heat dissipation layer is ≥ 0.8;

[0008] And / or, the thermal conductivity of the heat-conducting layer is ≥0.5 W / m*K.

[0009] Optionally, the organic aerogel material includes at least one of polyamides, polyimides, polyesters, polyurethanes, aldehydes, polyolefins and polysaccharides.

[0010] Optionally, the thermally conductive filler is a metal filler or an inorganic non-metal filler;

[0011] And / or, the thermal conductivity of the thermally conductive filler is greater than 5 W / m*K.

[0012] Optionally, the metal filler includes at least one of aluminum, copper, silver, magnesium, tin, lead and iron;

[0013] The inorganic non-metal filler includes at least one of boron nitride, boron carbide, silicon carbide, aluminum oxide, graphite, carbon nanotubes, graphene and nano-carbon powder.

[0014] Optionally, the mass ratio of the thermal conductive filler to the organic aerogel material is 0.1 to 0.5.

[0015] Optionally, the thermally conductive filler is a sheet-like structure.

[0016] Optionally, the heat dissipation layer has a thickness of 1 μm to 20 μm.

[0017] Optionally, the heat-conducting layer is a single-layer structure composed of the organic aerogel material and the heat-conducting filler;

[0018] or,

[0019] The heat-conducting layer is formed into a composite layer structure, and the heat-conducting layer includes a core layer and a first surface layer and a second surface layer respectively formed on both sides of the core layer;

[0020] Wherein, the core layer is formed by the organic aerogel material to which the thermal conductive filler is added;

[0021] The first surface layer and the second surface layer are respectively made of one of metal and its alloy foil, carbon fiber and aramid fiber.

[0022] Optionally, the first surface layer and the second surface layer are connected to the core layer via an adhesive layer;

[0023] Alternatively, the core layer is coated on one of the first skin layer and the second skin layer, and the first skin layer and the second skin layer are connected via the core layer.

[0024] Optionally, the thickness of the dome is 0.02 mm to 1 mm;

[0025] And / or, a thickness ratio of the heat dissipation layer to the heat conductive layer is 1:100 to 1:20.

[0026] Optionally, the compression strength of the dome is 1 MPa to 50 MPa, and the tensile strength of the dome is greater than 0.75 MPa.

[0027] According to a second aspect of the present invention, a diaphragm assembly is provided, which is applied to a sound-generating device, and the diaphragm assembly comprises:

[0028] a diaphragm; and

[0029] The dome as described above, wherein the dome is bonded to the diaphragm;

[0030] Alternatively, the dome and the diaphragm are integrally injection molded.

[0031] According to a third aspect of the present invention, a sound-generating device is provided, the sound-generating device comprising the diaphragm assembly as described above.

[0032] According to a fourth aspect of the present invention, there is provided an electronic device, the electronic device comprising the sound generating device as described above.

[0033] According to the dome of the embodiment of the present invention, the dome includes a thermal conductive layer and a heat dissipation layer, wherein the thermal conductive layer includes an organic aerogel material and a thermal conductive filler. The organic aerogel material in the thermal conductive layer is a solid material with large porosity and high specific surface area, and most of its volume is composed of air, thereby reducing the mass of the dome, and by adding thermal conductive fillers to the organic aerogel material and arranging the thermal conductive fillers along the orientation direction of the organic aerogel material, heat can be transferred to the heat dissipation layer outside the thermal conductive layer, thereby improving the heat dissipation efficiency of the dome.

[0034] 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

[0035] 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.

[0036] Figure 1 This is one of the structural schematic diagrams of the dome provided by the embodiment of the present invention.

[0037] Figure 2 This is the second structural schematic diagram of the dome provided by the embodiment of the present invention.

[0038] Figure 3 It is a schematic diagram of the heat-conducting layer structure of the dome provided by an embodiment of the present invention.

[0039] Figure 4 This is the third structural schematic diagram of the dome provided by the embodiment of the present invention.

[0040] Figure 5 This is the fourth structural schematic diagram of the dome provided by the embodiment of the present invention.

[0041] Figure 6 It is one of the structural schematic diagrams of the diaphragm assembly provided in an embodiment of the present invention.

[0042] Figure 7 This is the second structural schematic diagram of the diaphragm assembly provided in an embodiment of the present invention.

[0043] Figure 8 4 is a comparison diagram of the frequency response curves of the dome of the embodiment of the present invention and the dome of the comparative example.

[0044] Description of reference numerals:

[0045] 100, dome; 110, heat conductive layer; 111, core layer; 112, first surface layer; 113, second surface layer; 114, heat conductive filler; 120, heat dissipation layer; 200, diaphragm. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] See also Figures 1 to 5 The embodiment of the present invention provides a dome 100 for a sound-generating device, the dome 100 comprising a heat-conducting layer 110 and a heat-dissipating layer 120 formed outside the heat-conducting layer 110. Figure 5 As shown; wherein the thermal conductive layer 110 includes at least an organic aerogel material and a thermal conductive filler 114, the organic aerogel material is oriented in a direction perpendicular to the surface of the dome 100, and the thermal conductive filler 114 is added to the organic aerogel material and arranged along the orientation direction of the organic aerogel material.

[0052] Optionally, the dome 100 may be a flat plate structure, such as Figure 1 shown.

[0053] Of course, if Figure 2 As shown, the dome 100 may also be a convex hull structure, or other special-shaped structures, which is not specifically limited in the present invention.

[0054] The dome 100 of the embodiment of the present invention may include at least one layer of the heat conducting layer 110, such as Figure 5 As shown, the heat dissipation layer 120 is disposed on the outer side of the heat conducting layer 110 .

[0055] The dome 100 provided in the embodiment of the present invention is a composite structure formed by a heat-conducting layer 110 and a heat-dissipating layer 120, wherein the substrate of the heat-conducting layer 110 is an organic aerogel material, and the organic aerogel material is oriented along the thickness direction of the dome 100. In this way, the heat generated inside the sound-generating device when it is working can be transferred from the inside to the outside to the heat-dissipating layer 120 along the orientation direction of the organic aerogel material, that is, the heat can be transferred out along the thickness direction of the dome 100. In this way, a heat-conducting path can be formed on the dome 100 along its thickness direction, thereby improving the heat dissipation efficiency of the dome in practical applications.

[0056] It should be noted that, in order to improve the heat dissipation efficiency of the dome 100, a thermally conductive filler 114 is added to the organic aerogel material in the embodiment of the present invention, so as to improve the thermal conductivity of the organic aerogel material. After the thermally conductive filler 114 is added to the organic aerogel material, the formed thermally conductive layer 110 can have a high thermal conductivity, so that the dome 100 has the characteristics of light weight and high thermal conductivity.

[0057] At the same time, the present invention sets a heat dissipation layer 120 on the outside of the heat conductive layer 110. The heat dissipation layer 120 and the heat conductive layer 110 can improve the heat dissipation speed of the dome 100. The heat generated by the sound generating device during operation can be quickly dissipated, thereby reducing the overall temperature of the sound generating device, thereby extending the service life of the sound generating device.

[0058] For the dome 100 of the embodiment of the present invention, the organic aerogel material in the heat-conducting layer 110 is a solid material with large porosity and high specific surface area, and most of its volume is composed of air, thereby reducing the mass of the dome 100. Furthermore, by adding a heat-conducting filler 114 to the organic aerogel material and arranging the heat-conducting filler 114 along the orientation direction of the organic aerogel material, heat can be transferred to the heat dissipation layer 120 outside the heat-conducting layer 110 in a guided manner, thereby improving the heat dissipation efficiency of the dome 100.

[0059] In some examples of the present invention, Figures 1 to 5 As shown, the dome 100 includes a heat-conducting layer 110 and a heat-dissipating layer 120 , wherein the heat radiation coefficient of the heat-dissipating layer 120 is ≥0.8; and / or the thermal conductivity of the heat-conducting layer 110 is ≥0.5 W / m*K.

[0060] Optionally, the thermal radiation coefficient of the heat dissipation layer 120 can be 0.8, 0.85, 0.9, 0.95, 0.99, etc. The thermal radiation coefficient of a material can measure the relative strength of the material surface's ability to release energy in the form of radiation. The thermal radiation coefficient of a material is equal to the ratio of the energy radiated by the material at a certain temperature to the energy radiated by a black body at the same temperature, where the emissivity of a black body is equal to 1, and the thermal radiation coefficients of other materials are generally between 0 and 1. The thermal radiation coefficient of the heat dissipation layer 120 of the present invention is relatively large and can be close to 1, for example, 0.99, and the heat dissipation performance of the heat dissipation layer 120 is excellent.

[0061] Optionally, the thermal conductivity of the heat-conducting layer 110 may be 0.5 W / m*K, 0.8 W / m*K, 1 W / m*K, 1.2 W / m*K, etc., or even greater.

[0062] In practical applications, for example, the thermal conductivity of the heat-conducting layer 110 can be controlled within the range of 0.8W / m*K to 1.2W / m*K. The heat-conducting layer 110 with a thermal conductivity within this range can make the formed dome 100 have relatively smooth thermal conductivity, high thermal conductivity efficiency and relatively fast thermal conductivity, and will not affect the structural stability of the dome. Combined with the heat dissipation layer 120 with a thermal radiation coefficient between 0.85 and 0.99, the formed dome 100 can have good thermal conductivity and heat dissipation. In an embodiment of the present invention, by adding a thermally conductive filler 114 to the organic aerogel material and arranging the thermally conductive filler 114 along the orientation direction of the organic aerogel material, the thermal conductivity of the formed heat-conducting layer 110 can be significantly increased, for example, greater than or equal to 0.5W / m*K. At this time, the heat inside the sound-generating device can be transferred from the inside to the outside along the dome 100 along the thickness direction of the dome 100, thereby avoiding the accumulation of heat inside the sound-generating device and avoiding the occurrence of the undesirable phenomenon of excessive temperature inside the sound-generating device.

[0063] In the embodiment of the present invention, Figure 4 and Figure 5 As shown, a heat dissipation layer 120 is disposed outside the heat conductive layer 110 , and the heat radiation coefficient of the heat dissipation layer 120 may be greater than or equal to 0.8. Thus, based on the heat radiation coefficient of the heat dissipation layer 120 , the heat transferred by the heat conductive layer 110 may be quickly dissipated.

[0064] In the technical solution of the present invention, the thermal conductivity and heat dissipation performance of the dome 100 can be greatly improved by cooperating with the heat conducting layer 110 and the heat dissipation layer 120 .

[0065] It should be noted that when the dome 100 of the present invention is applied in a sound-generating device, the heat dissipation layer 120 of the dome 100 can be located on the side of the heat-conducting layer 110 away from the voice coil. In this way, the heat generated by the voice coil during operation can be promptly transferred from the heat-conducting layer 110 to the heat dissipation layer 120, and then the heat dissipation layer 120 can quickly dissipate the heat, thereby reducing the overall temperature of the sound-generating device.

[0066] In some examples of the present invention, the thermally conductive filler 114 added to the thermally conductive layer 110 may be a metal filler or an inorganic non-metal filler; and / or the thermal conductivity of the thermally conductive filler 114 is greater than 5 W / m*K.

[0067] In the present invention, the substrate of the heat-conducting layer 110 is an organic aerogel material. The organic aerogel material is anisotropic, and the organic aerogel material in the present invention is oriented in a direction perpendicular to the surface of the dome. By adding a heat-conducting filler 114 having a thermal conductivity greater than 5 W / m*K to the organic aerogel material, the problem of low thermal conductivity of the organic aerogel material itself can be improved, so that the formed dome 100 has good thermal conductivity.

[0068] For example, when a thermally conductive filler 114 having a thermal conductivity greater than 5 W / m*K is added to the organic aerogel material, the thermal conductivity of the organic aerogel material can be made ≥ 0.5 W / m*K, thereby improving the thermal conductivity of the dome 100 .

[0069] In some examples of the present invention, the thermally conductive filler 114 may be a metal filler, and the metal filler includes at least one of aluminum, copper, silver, magnesium, tin, lead, and iron.

[0070] That is, when forming the heat-conducting layer 110 of the dome 100, a certain amount of metal filler can be added to the organic aerogel material, and the metal filler can be used as the heat-conducting filler 114 to improve the thermal conductivity of the heat-conducting layer 110. The metal filler has a high thermal conductivity efficiency and can conduct heat through the movement of a large number of free electrons.

[0071] After adding at least one metal filler mentioned above to the organic aerogel material, the thermal conductivity of the material is significantly increased compared with the aerogel material without adding the metal filler.

[0072] That is to say, by adding one or more of the above-mentioned metal fillers as thermal conductive fillers 114 into the organic aerogel material and arranging the metal fillers along the orientation direction of the organic aerogel material, the thermal conductivity of the organic aerogel material can be significantly improved, and the ball top 100 can have the characteristic of high thermal conductivity.

[0073] In some examples of the present invention, the thermally conductive filler 114 may also be an inorganic non-metallic filler, and the inorganic non-metallic filler includes at least one of boron nitride, boron carbide, silicon carbide, aluminum oxide, graphite, carbon nanotubes, graphene and nano-carbon powder.

[0074] That is to say, the thermal conductive filler 114 is not limited to the above-mentioned metal filler, and the thermal conductive filler 114 can also be inorganic non-metal filler. The above-mentioned various inorganic non-metal fillers have high thermal conductivity, excellent heat resistance and thermal conductivity, and can also make the manufactured ball top 100 have the characteristics of high thermal conductivity.

[0075] It should be noted that, in the present invention, the heat conductive filler 114 can be a metal filler or an inorganic non-metal filler with high thermal conductivity. The thermal conductivity of the heat conductive filler 114 is greater than 5W / m*K. In this way, the thermal conductivity of the organic aerogel material to which the heat conductive filler 114 is added can reach ≥0.5W / m*K, and after being used to make the dome 100, the dome 100 can obtain good thermal conductivity.

[0076] The thermal conductive filler 114 is preferably boron nitride or graphene, because these two materials have good thermal conductivity and are easy to obtain.

[0077] In some examples of the present invention, the thermal conductive filler 114 may be selected to be a sheet-like structure.

[0078] The dome 100 of the present invention, as Figures 3 to 5 As shown, the organic aerogel material in the heat-conducting layer 110 is oriented along the thickness direction of the dome 100. By adding a heat-conducting filler 114 to the organic aerogel material, the thermal conductivity efficiency of the organic aerogel material can be improved. Moreover, in the present invention, the heat-conducting filler 114 can be selected from a sheet-like structure. The sheet-like heat-conducting filler 114 can have a large diameter-to-thickness ratio, so the contact area between the heat-conducting filler 114 and the organic aerogel material can be increased, so that the thermal conductivity efficiency of the organic aerogel material can be further improved. Furthermore, the dome 100 can obtain good thermal conductivity.

[0079] In some examples of the present invention, for the heat conductive layer 110 of the dome 100 , the mass ratio of the heat conductive filler 114 to the organic aerogel material is 0.1-0.5.

[0080] When forming the thermally conductive layer 110 of the dome 100, when the mass ratio of the thermally conductive filler 114 to the organic aerogel material is 0.1 to 0.5, the thermally conductive filler 114 and the organic aerogel material can interact with each other, so that a good thermal conductive path can be formed on the thermally conductive layer 110, thereby improving the thermal conductivity of the organic aerogel material, thereby significantly improving the thermal conductivity of the dome 100.

[0081] When the mass ratio of the thermal conductive filler 114 to the organic aerogel material is less than 0.1, that is, the amount of the thermal conductive filler 114 added to the organic aerogel material is relatively small, the thermal conductive filler 114 is isolated in the organic aerogel material, and the thermal conductive filler 114 may be wrapped by the organic aerogel material, and an effective heat conduction path cannot be formed. In this way, the thermal conductive fillers 114 are less likely to contact each other, so that the thermal conductivity of the material will not be effectively improved.

[0082] When the mass ratio of the thermal conductive filler 114 to the organic aerogel material is greater than 0.5, that is, when the amount of the thermal conductive filler 114 added to the organic aerogel material is too much, the density of the formed thermal conductive layer 110 will increase, thereby increasing the weight of the formed dome 100, which will affect the frequency response of the sound-generating device. In addition, due to the relatively reduced content of the organic aerogel as the basis of the dome, there is also a risk of adversely affecting the overall mechanical properties of the dome 100, making the dome inferior in vibration performance.

[0083] For example, the mass ratio of the thermal conductive filler 114 to the organic aerogel material is 0.1, 0.2, 0.3, 0.4, 0.5, etc. Preferably, the mass ratio of the thermal conductive filler 114 to the organic aerogel material is 0.3-0.5. Within this range, the dome 100 can have a lighter mass and appropriate rigidity without affecting the structural stability of the dome 100, while having higher thermal conductivity.

[0084] In some examples of the present invention, the dome 100 includes a heat-conducting layer 110 and a heat-dissipating layer 120 , wherein the thickness of the heat-dissipating layer 120 may be 1 μm to 20 μm.

[0085] When the dome 100 of the present invention is applied to a sound-generating device, the heat dissipation layer 120 of the dome 100 can be located on the outer surface side of the heat-conducting layer 110 away from the voice coil, the heat radiation coefficient of the heat dissipation layer 120 is ≥ 0.8, and the thickness of the heat dissipation layer 120 is 1 μm to 20 μm. In this way, the dome 100 has good thermal conductivity and heat dissipation, and the dome 100 can quickly transfer the heat generated by the voice coil to avoid heat accumulation inside the sound-generating device.

[0086] The heat dissipation layer 120 can be combined with the heat conductive layer 110 by spraying, roller coating, brushing or other coating methods to form the dome 100 .

[0087] The heat dissipation layer 120 may be composed of, for example, a resin matrix and a filler with a high emissivity.

[0088] For example, the resin matrix includes at least one of acrylate, polyurethane, epoxy resin, phenolic resin, etc. For example, the high emissivity filler includes at least one of graphite, silicon carbide, aluminum oxide, graphene, iron oxide, copper oxide, etc.

[0089] The dome 100 of the present invention is a composite structure, wherein the heat dissipation layer 120 can quickly dissipate the heat conducted by the heat-conducting layer 110 , thereby enabling the dome 100 to have good thermal conductivity and heat dissipation capabilities.

[0090] For example, the thickness of the heat dissipation layer 120 may be 1 μm, 3 μm, 5 μm, 7 μm, 9 μm, 11 μm, 13 μm, 15 μm, 17 μm, 20 μm, etc.

[0091] In the present invention, when the thickness of the heat dissipation layer 120 is between 8 μm and 12 μm, it will not affect the thermal conductivity of the heat conductive layer 110, and can form a good match with the heat conductive layer 110, so that the dome 100 has excellent heat dissipation performance without causing excessive increase in the weight of the dome 100.

[0092] In some examples of the present invention, the thickness of the dome 100 may be 0.02 mm to 1 mm; and / or the thickness ratio of the heat dissipation layer 120 to the heat conduction layer 110 is 1:100 to 1:20.

[0093] It should be noted that the high-frequency cutoff frequency Fh of the sound-generating device is proportional to the thickness of the dome. If the thickness of the dome is too small, the high-frequency cutoff frequency Fh of the sound-generating device using the dome will be too low. If the thickness of the dome is too large, it will affect the vibration space in the sound-generating device. Therefore, the thickness of the dome should be reasonably adjusted.

[0094] In the present invention, the dome 100 includes a heat dissipation layer 120 and a heat conductive layer 110. The heat conductive layer 110 is a main layer, which uses an organic aerogel material and a heat conductive filler 114. The heat conductive layer 110 has an important influence on the weight, strength and thermal conductivity of the dome 100. The heat dissipation layer 120 can cooperate with the heat conductive layer 110 to achieve a good heat dissipation function of the dome 100. Therefore, it is necessary to reasonably control the heat dissipation layer 120 and the heat conductive layer 110.

[0095] In the dome 100 of the present invention, the thickness ratio of the heat dissipation layer 120 to the heat conduction layer 110 is 1:100 to 1:20. Within this range, the dome 100 has the characteristics of light weight, high thermal conductivity and fast heat dissipation speed.

[0096] For example, the thickness ratio of the heat dissipation layer 120 to the heat conductive layer 110 is 1:100, 1:80, 1:60, 1:40, 1:20, etc., which is not limited in the embodiment of the present invention.

[0097] When the thickness ratio of the heat dissipation layer 120 to the heat conduction layer 110 is between 1:40 and 1:80, the formed dome 100 is light in weight and sufficiently rigid, and at the same time, the heat conduction and heat dissipation effects of the dome are both good.

[0098] In some examples of the present invention, the compression strength of the dome 100 is 1 MPa to 50 MPa, and the tensile strength of the dome 100 is greater than 0.75 MPa.

[0099] It should be noted that the compression strength of the dome is related to its rigidity. The greater the compression strength of the dome, the greater the rigidity of the dome.

[0100] In the present invention, the compression strength of the dome 100 is relatively large, and the compression strength is 1 MPa to 50 MPa, so that the rigidity of the dome 100 is relatively large. In this way, the sound-generating device using the dome 100 can have better high-frequency performance.

[0101] It should be noted that the higher the tensile strength of the dome, the better its tensile resistance.

[0102] In the present invention, the tensile strength of the dome 100 is greater than 0.75 MPa, so that the dome 100 can be prevented from breaking during use.

[0103] For example, the tensile strength of the dome 100 is 10 MPa, 20 MPa, 30 MPa, 40 MPa, 50 MPa or even greater.

[0104] More preferably, the compression strength of the dome 100 is greater than 30 MPa, which can meet the rigidity requirements of the dome 100, and the sound-generating device using the dome 100 can have better high-frequency performance.

[0105] In some examples of the present invention, the substrate for making the thermal conductive layer 110 is an organic aerogel material, and the organic aerogel material includes at least one of polyamides, polyimides, polyesters, polyurethanes, aldehydes, polyolefins and polysaccharides.

[0106] In the present invention, the substrate of the heat-conducting layer of the dome is an organic aerogel, the skeleton of the organic aerogel comprises an organic polymer, and the organic polymer comprises at least one of polyimides, polyamides, polyesters, aldehydes, polyolefins and polysaccharides.

[0107] Organic aerogel is an organic polymer material formed by the sol-gel method. During the preparation process, the gas replaces the liquid phase in the gel through drying, thereby forming a solid material with a nano-scale porous structure, which also has the properties of a gel. This material is the organic aerogel material used in the present invention.

[0108] In the present invention, the skeleton of the organic aerogel can be an aerogel made of a polymer organic material, which is not only porous and light, but also has a certain rigidity compared to inorganic aerogel materials. Therefore, it can be used to prepare the dome of the sound-generating device, which can make the dome have the characteristics of light weight and high strength. In practical applications, one or more of the above-mentioned organic polymer materials can be selected according to the actual needs of the dome.

[0109] In some examples of the present invention, Figure 3 As shown, the heat-conducting layer 110 of the dome 100 is a single-layer structure composed of the organic aerogel material and the heat-conducting filler 114 .

[0110] In some examples of the present invention, Figure 4 and Figure 5 As shown, the heat-conducting layer 110 of the dome 100 is formed as a composite structure, and the heat-conducting layer 110 may include a core layer 111 and a first surface layer 112 and a second surface layer 113 respectively formed on both sides of the core layer 111; the core layer 111 is formed by the organic aerogel material to which the heat-conducting filler 114 is added; the first surface layer 112 and the second surface layer 113 may be respectively made of one of metal and its alloy foil, carbon fiber and aramid fiber.

[0111] That is, the heat-conducting layer 110 itself can be a single layer of organic aerogel material layer with a heat-conducting filler 114 added thereto, such as Figure 3 Of course, the heat-conducting layer 110 of the dome 100 can also be a composite structure, that is, firstly, a heat-conducting filler 114 is added to the organic aerogel material to form a core layer 111, and then a first surface layer 112 and a second surface layer 113 are respectively arranged on the upper and lower surfaces of the core layer 111. Figure 4 and Figure 5 shown.

[0112] Please continue as Figure 4 and Figure 5 As shown, a heat dissipation layer 120 may be further provided on one of the first surface 112 and the second surface 113 of the heat conductive layer 110. It should be noted that, in the heat conductive layer 110, the organic aerogel material is oriented in a direction perpendicular to the surface of the dome 100, and the heat conductive filler 114 is added to the organic aerogel material 114 and arranged along the orientation direction of the organic aerogel material 114.

[0113] Optionally, the heat conducting layer 110 can be made into a flat plate structure or a convex hull structure. Figure 1 and Figure 2 Then, the heat dissipation layer 120 is covered on at least one surface of the heat conducting layer 110 .

[0114] Optionally, the material of the first surface layer 112 and the second surface layer 113 can be at least one of high modulus and high strength materials such as aluminum and aluminum alloy foil, titanium and titanium alloy foil, magnesium and magnesium alloy foil, copper and copper alloy foil, carbon fiber, and aramid fiber.

[0115] In some examples of the present invention, the first surface layer 112 and the second surface layer 113 are connected to the core layer 111 via an adhesive layer; alternatively, the core layer 111 is coated on one of the first surface layer 112 and the second surface layer 113, and the first surface layer 112 and the second surface layer 113 are connected via the core layer 111.

[0116] That is to say, for the heat-conducting layer 110 of the composite structure, the core layer 111 and the two outer surface layers can be directly connected through the adhesive layer. This connection method is simple and has low cost.

[0117] Of course, for the heat-conducting layer 110 of the composite structure, the core layer 111 can also be formed by coating. Specifically, the core layer 111 can be formed by coating on the first surface layer 112, and then the second surface layer 113 is covered on the side surface of the core layer 111 away from the first surface layer 112, so that the core layer 111 can bond the first surface layer 112 and the second surface layer 113 together. Of course, it is understandable that the core layer 111 can also be formed by coating on the second surface layer 113 first, and then the first surface layer 112 is covered on the side surface of the core layer 111 away from the second surface layer 113.

[0118] When the dome 100 of the present invention is applied to a sound-generating device, if the heat-conducting layer 110 is a composite structure, specifically, the heat-conducting layer 110 includes a core layer 111 and a first surface layer 112 and a second surface layer 113 arranged on both sides of the core layer 111, wherein the core layer 111 is an organic aerogel material layer containing a heat-conducting filler 114, one of the first surface layer 112 and the second surface layer 113 is connected to the voice coil, and a heat dissipation layer 120 is arranged on the other of the first surface layer 112 and the second surface layer 113.

[0119] The embodiment of the present invention further provides a diaphragm assembly, which can be applied to a sound-generating device. The diaphragm assembly, such as Figure 6 and 7 As shown, it comprises: a diaphragm 200 and the dome 100 described in any of the above embodiments, wherein the dome 100 is bonded to the diaphragm 200; or, the dome 100 and the diaphragm 200 are integrally injection molded.

[0120] Optionally, the dome 100 may be bonded to the diaphragm 200 using an adhesive such as glue.

[0121] Of course, the dome 100 can also be integrally injection molded with the diaphragm 200. This method has high structural stability and avoids polarization of the diaphragm component during the sound generation process of the sound generation device.

[0122] The diaphragm 200 may be made of engineering plastics, for example. The engineering plastics include polyetheretherketone (PEEK), PAR, etc. In other embodiments, the diaphragm 200 may also be made of elastomeric materials, for example, thermoplastic polyurethane elastomer (TPU), thermoplastic polyester elastomer (TPEE), rubber, etc.

[0123] In addition, the diaphragm 200 may also be made of adhesive film, such as acrylic adhesive, silicone adhesive, etc.

[0124] The diaphragm assembly provided in the embodiment of the present invention, based on the main body material of the dome 100 being an organic aerogel material, can make the weight of the dome 100 lighter, and thus the weight of the entire diaphragm assembly can be lighter, so that the thickness of the dome 100 can be appropriately increased, thereby improving the high-frequency sensitivity and cutoff frequency of the sound-generating device, and the sound-generating device can obtain a better sound effect at a wider frequency. At the same time, by adding a thermally conductive filler 114 to the organic aerogel material, the thermal conductivity of the dome 100 can be increased, so that the dome 100 has good thermal conductivity. In addition, the dome 100 also includes a heat dissipation layer 120, which can make the dome 100 have the characteristics of rapid heat dissipation.

[0125] An embodiment of the present invention further provides a sound-generating device, which includes the above-mentioned diaphragm assembly.

[0126] The diaphragm assembly is applied to the sound-generating device, so that the diaphragm assembly has the characteristics of light weight, high thermal conductivity and good heat dissipation effect. During the vibration of the diaphragm assembly, the sound-generating device can obtain better intermediate frequency sensitivity, and at the same time, the heat in the sound-generating device can be quickly transferred out through the dome 100 on the diaphragm 200.

[0127] The sound generating device provided by the embodiment of the present invention can be used in various electronic devices.

[0128] An embodiment of the present invention further provides an electronic device, which includes the sound-generating device as described above.

[0129] The electronic device may be, for example, 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 the present invention is not limited to this.

[0130] 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.

[0131] Figure 5 The dome of the embodiment is shown. The dome 100 includes a heat-conducting layer 110 and a heat-dissipating layer 120. The heat-conducting layer 110 is made of an organic aerogel material with added flake graphene. The heat-dissipating layer 120 is arranged on the outside of the heat-conducting layer 110. The heat-dissipating layer 120 is a nano-carbon material. The dome in Comparative Example 1 is a dome made of an organic aerogel material with added flake graphene. Comparative Example 2 is a dome made of a polyimide organic aerogel material. The domes in the embodiment, Comparative Example 1 and Comparative Example 2 have the same thickness and shape.

[0132] Embodiment 1:

[0133] Step 1: Take 0.5 mol of p-phenylenediamine and dissolve it in N,N-dimethylacetamide, and add 0.52 mol of 3,3'4,4'-dibenzophenonetetracarboxylic dianhydride to the N,N-dimethylacetamide containing p-phenylenediamine, wherein 3,3'4,4'-dibenzophenonetetracarboxylic dianhydride can be added in small amounts and multiple times; after the addition of 3,3'4,4'-dibenzophenonetetracarboxylic dianhydride is completed, the formed mixture is polymerized in an ice water bath for 5 hours to obtain a polymer reactant; 0.01 mol of a cross-linking agent is added to the obtained polymer reactant, and the cross-linking agent is 1,3,5-tri(aminophenoxy)benzene, to obtain a polyamic acid salt solution; the obtained polyamic acid salt solution is slowly poured into acetone, and the precipitated filaments obtained by precipitation are polyimide materials, and the polyimide material is dried to constant weight.

[0134] Step 2: Take 6g of the polyimide material obtained in step 1 and 3g of flaky graphene and disperse them in 24g of deionized water solution to prepare an organic hydrogel mixed solution with a polyamide salt mass fraction of 20%, place the organic hydrogel mixed solution between the upper and lower molds of the spherical top, and place the mold on a hot pressing molding machine, hot press molding at 60°C, take out after cooling, and obtain an organic hydrogel film layer with a spherical top shape.

[0135] Step 3: Place the organic hydrogel film layer prepared in step 2 in a -50°C atmosphere for freeze drying to obtain an organic aerogel film layer.

[0136] Step 4: Place the organic aerogel film obtained in step 3 in an oven and perform a thermal crosslinking treatment by programmed temperature increase (180°C / 1h, 350°C / 4h). After step 4, the heat-conducting layer 110 for the dome 100 described in the present invention can be obtained, and the heat-conducting layer 110 has a dome-shaped structure.

[0137] Step 5: Spray a nanocarbon solution on one surface of the obtained heat-conducting layer 110, and dry the nanocarbon solution to form the heat dissipation layer 120 described in the present invention. The heat dissipation layer 120 is attached and fixed on the heat-conducting layer 110 to form the dome of the sound-generating device described in the present invention.

[0138] Comparative Example 1:

[0139] Step 1: Take 0.5 mol of p-phenylenediamine and dissolve it in N,N-dimethylacetamide, and add 0.52 mol of 3,3'4,4'-dibenzophenonetetracarboxylic dianhydride to the N,N-dimethylacetamide containing p-phenylenediamine, wherein 3,3'4,4'-dibenzophenonetetracarboxylic dianhydride can be added in small amounts and multiple times; after the addition of 3,3'4,4'-dibenzophenonetetracarboxylic dianhydride is completed, the formed mixture is polymerized in an ice water bath for 5 hours to obtain a polymer reactant; 0.01 mol of a cross-linking agent is added to the obtained polymer reactant, and the cross-linking agent is 1,3,5-tri(aminophenoxy)benzene, to obtain a polyamic acid salt solution; the obtained polyamic acid salt solution is slowly poured into acetone, and the precipitated filaments obtained by precipitation are polyimide materials, and the polyimide material is dried to constant weight.

[0140] Step 2: Take 6g of the polyimide material obtained in step 1 and 3g of flaky graphene and disperse them in 24g of deionized water solution to prepare an organic hydrogel mixed solution with a polyamide salt mass fraction of 20%, place the organic hydrogel mixed solution between the upper and lower molds of the spherical top, and place the mold on a hot pressing molding machine, hot press molding at 60°C, take out after cooling, and obtain an organic hydrogel film layer with a spherical top shape.

[0141] Step 3: Place the organic hydrogel film layer prepared in step 2 in a -50°C atmosphere for freeze drying to obtain an organic aerogel film layer.

[0142] Step 4: Place the organic aerogel film obtained in step 3 in an oven and perform a thermal crosslinking treatment by programmed temperature increase (180°C / 1h, 350°C / 4h). After step 4, the heat-conducting layer 110 for the dome described in the present invention can be obtained, and the heat-conducting layer 110 has the shape structure of the dome 100.

[0143] Comparative Example 2:

[0144] Step 1: Take 0.5 mol of p-phenylenediamine and dissolve it in N,N-dimethylacetamide, and add 0.52 mol of 3,3'4,4'-dibenzophenonetetracarboxylic dianhydride to the N,N-dimethylacetamide containing p-phenylenediamine, wherein 3,3'4,4'-dibenzophenonetetracarboxylic dianhydride can be added in small amounts and multiple times; after the addition of 3,3'4,4'-dibenzophenonetetracarboxylic dianhydride is completed, the formed mixture is polymerized in an ice water bath for 5 hours to obtain a polymer reactant; 0.01 mol of a cross-linking agent is added to the obtained polymer reactant, and the cross-linking agent is 1,3,5-tris(aminophenoxy)benzene, to obtain a polyamic acid salt solution; the obtained polyamic acid salt solution is slowly poured into acetone, and the precipitated filaments obtained by precipitation are polyimide materials, and the polyimide materials are dried to constant weight.

[0145] Step 2: Take 6 g of the polyimide material obtained in step 1 and disperse it in 24 g of deionized water solution to prepare an organic hydrogel with a polyamide salt mass fraction of 20%. Place the organic hydrogel between the upper and lower molds of the spherical top, and place the mold on a hot pressing molding machine. Hot pressing is performed at 60°C. After cooling, take it out to obtain an organic hydrogel film layer with a spherical top shape.

[0146] Step 3: Place the organic hydrogel film layer prepared in step 2 in a -50°C atmosphere for freeze drying to obtain an organic aerogel film layer.

[0147] Step 4: Place the organic aerogel film layer obtained in step 3 in an oven and perform a thermal crosslinking treatment by programmed temperature increase (180°C / 1h, 350°C / 4h). After step 4, an organic aerogel layer without thermal conductive fillers can be obtained, and the aerogel layer has a dome-shaped structure.

[0148] Figure 5 The dome 100 of the embodiment is shown, and the dome 100 includes a heat-conducting layer 110 and a heat-dissipating layer 120, wherein the heat-dissipating layer 120 has a thickness of 8 μm; the dome of comparative example 1 and the dome of comparative example 2 are both single-layer structures. The dome of the embodiment has the same thickness as the domes of comparative examples 1 and 2.

[0149] Comparison of thermal conductivity of the dome in Example, Comparative Example 1 and Comparative Example 2:

[0150] The dome in the embodiment, comparative example 1 and comparative example 2 were respectively bonded to the diaphragm fold made of polyester elastomer by glue to form a diaphragm assembly, and then installed in the sound-generating device. The temperature of the voice coil in the sound-generating device was tested at the rated power of the sound-generating device. After the sound-generating device worked for 660 seconds under the same conditions, the temperature rise curve obtained can be shown as follows: Figure 8 shown.

[0151] In the dome 100 of the embodiment, the heat conducting layer 110 is an organic aerogel material with added flake graphene, and the heat dissipation layer 120 is a nano-carbon material. When the dome 100 of the embodiment is applied to a sound-generating device, the heat dissipation layer 120 is arranged on the outer surface of the dome 100 away from the voice coil, Figure 8 It can be seen that the temperature of the sound-generating device using the dome of the embodiment is the lowest, and after the sound-generating device works for 660 seconds, the temperature of the sound-generating device is 122.8° C. It can be seen that the dome 100 plays a good role in heat dissipation and heat conduction.

[0152] The dome of comparative example 1 is different from the dome of the embodiment in that the dome of comparative example 1 is a single-layer structure, which only has an organic aerogel material with added flake graphene, and no heat-conducting layer is provided. Figure 8 It can be seen that after the ball top of comparative example 1 is applied to the sound-generating device, the temperature of the sound-generating device is 128.7° C. after the sound-generating device works for 660 seconds.

[0153] The dome of Comparative Example 2 is a polyimide aerogel dome, to which no thermal conductive filler is added. Figure 8 It can be seen that after the dome of comparative example 2 is applied to the sound-generating device, the temperature of the sound-generating device is 131.6° C. after the sound-generating device has worked for 660 seconds.

[0154] By comparison, it can be seen that the temperature of the dome of the embodiment is 5.9°C lower than that of the dome of comparative example 1; the temperature of the dome of the embodiment is 8.8°C lower than that of the dome of comparative example 2.

[0155] It can be determined that after adding the heat-conducting filler 114 to the organic aerogel material to form the heat-conducting layer 110, the thermal conductivity of the heat-conducting layer 110 can be increased, thereby improving the thermal conductivity of the dome 100 and reducing the temperature of the sound-generating device. When the heat dissipation layer 120 is arranged outside the heat-conducting layer 110, the heat conducted away by the heat-conducting layer 110 is radiated to the external space, and the temperature of the sound-generating device can be further reduced.

[0156] It should be noted that all the embodiments mentioned above are based on the innovative inventive concept of "using organic aerogel to prepare acoustic devices". The case involving organic aerogel in the comparative examples cited above does not mean that "using organic aerogel to prepare acoustic devices" belongs to conventional technical means and prior art. Such comparative examples are intended to better reflect the optimized performance effects of the embodiments of the present invention and to characterize the advanced nature of the technical solution of the present invention.

[0157] 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.

[0158] 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 for a sound-generating device, characterized in that: The dome includes a heat-conducting layer and a heat-dissipating layer formed outside the heat-conducting layer; The heat-conducting layer at least comprises an organic aerogel material and a heat-conducting filler, wherein the organic aerogel material is oriented in a direction perpendicular to the surface of the spherical top, and the heat-conducting filler is added to the organic aerogel material and arranged along the orientation direction of the organic aerogel material; The organic aerogel material includes at least one of polyamides, polyimides, polyesters, polyurethanes, aldehydes, polyolefins and polysaccharides; The mass ratio of the thermal conductive filler to the organic aerogel material is 0.1 to 0.5; The compression strength of the dome is 1MPa-50MPa, and the tensile strength of the dome is greater than 0.75MPa.

2. The dome according to claim 1, characterized in that: The thermal radiation coefficient of the heat dissipation layer is ≥ 0.8; And / or, the thermal conductivity of the heat-conducting layer is ≥0.5 W / m*K.

3. The dome according to claim 1, characterized in that: The thermally conductive filler is a metal filler or an inorganic non-metal filler; And / or, the thermal conductivity of the thermally conductive filler is greater than 5 W / m*K.

4. The dome according to claim 3, characterized in that: The metal filler includes at least one of aluminum, copper, silver, magnesium, tin, lead and iron; The inorganic non-metal filler includes at least one of boron nitride, boron carbide, silicon carbide, aluminum oxide, graphite, carbon nanotubes, graphene and nano-carbon powder.

5. The dome according to claim 1, characterized in that: The thermal conductive filler is a sheet-like structure.

6. The dome according to claim 1, characterized in that: The thickness of the heat dissipation layer is 1 μm to 20 μm.

7. The dome according to claim 1, characterized in that: The heat-conducting layer is a single-layer structure composed of the organic aerogel material and the heat-conducting filler; or, The heat-conducting layer is formed into a composite layer structure, and the heat-conducting layer includes a core layer and a first surface layer and a second surface layer respectively formed on both sides of the core layer; Wherein, the core layer is formed by the organic aerogel material to which the thermal conductive filler is added; The first surface layer and the second surface layer are respectively made of one of metal and its alloy foil, carbon fiber and aramid fiber.

8. The dome according to claim 7, characterized in that: The first surface layer and the second surface layer are connected to the core layer via a glue layer; Alternatively, the core layer is coated on one of the first skin layer and the second skin layer, and the first skin layer and the second skin layer are connected via the core layer.

9. The dome according to claim 1, characterized in that: The thickness of the dome is 0.02 mm to 1 mm; And / or, a thickness ratio of the heat dissipation layer to the heat conductive layer is 1:100 to 1:

20.

10. A diaphragm assembly, applied to a sound-generating device, characterized in that: include: Diaphragm; as well as The dome according to any one of claims 1 to 9, wherein the dome is bonded to the diaphragm; Alternatively, the dome and the diaphragm are integrally injection molded.

11. A sound-generating device, characterized in that: Comprising a diaphragm assembly according to claim 10.

12. An electronic device, characterized in that: Comprising a sound-generating device according to claim 11.

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