CN115243165A - A ball top, vibrating diaphragm subassembly, sound generating mechanism and electronic equipment for sound generating mechanism - Google Patents
A ball top, vibrating diaphragm subassembly, sound generating mechanism and electronic equipment for sound generating mechanism Download PDFInfo
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- CN115243165A CN115243165A CN202210767706.5A CN202210767706A CN115243165A CN 115243165 A CN115243165 A CN 115243165A CN 202210767706 A CN202210767706 A CN 202210767706A CN 115243165 A CN115243165 A CN 115243165A
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- Prior art keywords
- dome
- core layer
- layer
- ball top
- organic aerogel
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Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/127—Non-planar diaphragms or cones dome-shaped
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
- H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/025—Diaphragms comprising polymeric materials
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a dome, a vibrating diaphragm component, a sound generating device and electronic equipment for the sound generating device; the ball top of the sound generating device comprises a core layer and two surface layers, wherein the two surface layers are respectively positioned on two sides of the core layer in the thickness direction of the core layer; the core layer is at least made of an organic aerogel material, the core layer is internally provided with a porous structure, the porous structure comprises cells, and the thickness of the cell walls of the cells is 1nm-0.1 μm; the compressive strength of the dome in the thickness direction thereof is greater than 10MPa. The surface layer in the ball top can be directly bonded and fixed through the organic aerogel layer, and the density of the organic aerogel layer is low, so that the weight of the ball top can be reduced, and the medium-frequency sensitivity can be improved. The organic aerogel layer has good temperature resistance, so that the vibration consistency of the ball top in a high-temperature environment can be ensured, and the occurrence of separation vibration is avoided.
Description
Technical Field
The invention relates to the technical field of electronic equipment, in particular to a dome, a vibrating diaphragm assembly, a sound generating device and electronic equipment for the sound generating device.
Background
In recent years, electroacoustic devices are required to be thinner and lighter, and have a wider high-low frequency range, a better intermediate frequency sensitivity, and a suitable F0 and high frequency Fh (high frequency cutoff frequency).
Most of the conventional composite ball top structures are aluminum foil, adhesive layer, foam, adhesive layer and aluminum foil, wherein the adhesive layer is usually selected from phenolic resin, organic silicon resin and epoxy resin, and the density is generally more than 1.3g/cm 3 . For such a dome structure, the glue layer may cause an increase in dome thickness, a greater mass, and a decrease in sensitivity. The adhesive layer is made of resin material, the long-term service temperature of the resin material is generally less than 150 ℃, the temperature of the loudspeaker can reach 140 ℃ when the loudspeaker works for a long time or under the reliable condition, and the service limit of the resin material is close to. The resin material becomes soft at high temperature, resulting in a reduction in the modulus and strength of the dome, a tendency to cause cutting vibration, and a forward shift in the high-frequency cutoff frequency. In addition, the foam for matching the conventional ball top structure is a homogeneous material, the modulus density ratio is low, and the high-frequency cut-off frequency is moved forward.
Disclosure of Invention
The invention aims to provide a new technical scheme for a dome, a diaphragm assembly, a sound generating device and electronic equipment of the sound generating device.
According to a first aspect of the present invention, there is provided a dome for a sound generating apparatus, the dome comprising a core layer and two surface layers, the two surface layers being located on both sides of the core layer in a thickness direction of the core layer;
the core layer is at least made of an organic aerogel material, the interior of the core layer is provided with a porous structure, the porous structure comprises cells, and the cell wall thickness of each cell is 1nm-1 mu m;
the compressive strength of the dome in the thickness direction thereof is greater than 10MPa.
Optionally, the pore size of the cells is 5nm to 500 μm.
Optionally, the peel force between the core layer and the skin layer is > 200g/25mm at room temperature.
Optionally, the organic aerogel material comprises at least one of polyimides, polyamides, polyesters, aldehydes, polyolefins, and polysaccharides.
Optionally, the backbone of the organic aerogel material contains an imide ring that is an aliphatic imide and/or an aromatic imide.
Optionally, the structure of the aliphatic imide comprises:
optionally, the structure of the aromatic imide comprises:
optionally, the thickness of the dome is 10 μm to 300 μm;
and/or the ratio of the thickness of the core layer to the total thickness of the ball top is 1/6-1/3.
Optionally, the bending modulus of the ball top is 1.5 GPa-20 GPa;
and/or the modulus density ratio of the ball top is 5GPa 3 /g～60GPa.cm 3 /g。
Optionally, the flexural modulus of the core layer is 30MPa to 600MPa;
and/or the compressive modulus of the core layer along the thickness direction thereof is 30MPa to 600MPa;
and/or the compression modulus of the core layer along the direction parallel to the surface layer is 30 MPa-200 MPa.
Optionally, the core layer further comprises a filler comprising at least one of a reinforcing material, an electrically conductive material, and a thermally conductive material.
Optionally, the reinforcing material is reinforcing fibers and/or reinforcing particles;
the reinforced fiber is at least one of chopped fiber, continuous fiber, fabric and non-woven fabric;
the reinforcing particles are at least one of inorganic particles of boron nitride, silicon carbide, carbon black, aluminum oxide and metal particles.
Optionally, the conductive material is at least one of carbon black, carbon fiber, flake graphite, metal particles, nickel-coated graphite powder, nickel-coated carbon fiber, carbon black, metal powder, metal foil, and metal fiber.
Optionally, the heat conducting material is a metal filler or an inorganic non-metal filler;
the metal filler comprises at least one of aluminum, copper, silver, magnesium, tin, lead and iron;
the inorganic non-metallic filler comprises at least one of boron nitride, boron carbide, silicon carbide, aluminum oxide, graphite, carbon nano tubes, graphene and nano carbon powder.
Optionally, the material of the surface layer is at least one of a metal material, an engineering plastic material and a fiber material.
According to a second aspect of the present invention, there is provided a diaphragm assembly applied to a sound generating apparatus, the diaphragm assembly comprising:
vibrating diaphragm; and
the dome as described above, the dome is adhered to the diaphragm;
or the ball top and the vibrating diaphragm are integrally formed by injection molding.
According to a third aspect of the present invention, there is provided a sound generating device comprising a diaphragm assembly as described above.
According to a fourth aspect of the present invention, there is provided an electronic device comprising the sound emitting apparatus as described above.
According to the ball top, the ball top is of a composite structure, the core layer is the organic aerogel layer, the two surface layers can be directly bonded and fixed through the organic aerogel layer, the glue layer can be omitted, and the density of the organic aerogel layer is low, so that the weight of the ball top can be reduced, and the medium-frequency sensitivity can be improved. The organic aerogel layer has good temperature resistance, so that the vibration consistency of the ball top in a high-temperature environment can be ensured, and the sound production of separated vibration is avoided. Through the design, the ball top has higher modulus, and the mechanical property of the ball top can be improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of a dome according to an embodiment of the present invention.
Fig. 2 is a second schematic structural diagram of a dome according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a structure of an organic aerogel material according to an embodiment of the present invention.
Fig. 4 is a third schematic structural diagram of a dome according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a diaphragm assembly according to an embodiment of the present disclosure.
Fig. 6 is a second schematic structural diagram of a diaphragm assembly according to an embodiment of the present invention.
Fig. 7 is a graph comparing FR curves for a ball top of an example of the invention and a ball top of a comparative example.
Description of reference numerals:
100. a ball top; 110. a core layer; 111. cells; 120. a surface layer; 200. and (5) vibrating a diaphragm.
Detailed Description
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 the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
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.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.
Referring to fig. 1 to 4, an embodiment of the invention provides a ball top 100 for a sound generating device, where the ball top 100 includes a core layer 110 and two surface layers 120, and in a thickness direction of the core layer 110, the two surface layers 120 are respectively located on two sides of the core layer 110; the core layer 110 is made of at least an organic aerogel material, the core layer 110 has a porous structure inside, the porous structure includes cells 111, and the cell wall thickness of the cells 111 is 1nm to 1 μm; the dome 100 has a compressive strength in its thickness direction of more than 10MPa.
Alternatively, the dome 100 may have a flat plate-like structure, as shown in fig. 1.
Of course, as shown in fig. 2, the dome 100 may also have a convex-bag structure or other shape-changing structure, which is not limited in the present invention.
The ball top 100 of the present invention is a multi-layer structure, as shown in fig. 3 and 4, wherein the substrate of the core layer 110 is an organic aerogel material, which can form an organic aerogel layer, the organic aerogel layer is located between the two surface layers 120, and the organic aerogel material is oriented along the thickness direction of the ball top 100.
As shown in fig. 4, the organic aerogel material can be directionally arranged from one surface layer 120 to another surface layer 120 between the two surface layers 120, so that the two surface layers 120 can be bonded and fixed by the core layer 110 made of the organic aerogel material, and thus, a glue layer can be omitted from being disposed between the surface layer 120 and the core layer 110. Thus, the thickness of the dome 100 is advantageously reduced, so that the dome 100 can be made thinner and lighter.
It should be noted that, present conventional composite structure's ball top is mostly in the foam sandwich layer two fixed aluminium foil layers that bond through the glue film respectively on the surface to aluminium foil layer + glue film + foam layer + glue film + aluminium foil layer collocation has been formed. The ball top of the composite structure formed in this way has a large thickness due to the introduction of the glue layer.
Although the ball top 100 of the present invention has a composite structure, as shown in fig. 4, it omits a glue layer between the core layer 110 and the surface layer 120, so as to reduce the overall thickness of the ball top 100, and make the ball top 100 thinner.
In the ball top 100 of the present invention, the core layer 110 is made of an organic aerogel material, the organic aerogel material is a solid material with large porosity and large specific surface area, the bulk of the organic aerogel material is composed of air, the porosity is 30% -98%, and the density is 0.03g/cm 3 ～1g/cm 3 The ball top has low density, and the ball top can be lighter in weight by adopting the organic aerogel material as the base material and has good medium-frequency sensitivity.
In the present invention, the organic aerogel material used to form the core layer 110 is a porous structure, which may include a plurality of cells 111, and may form a honeycomb structure as shown in fig. 3, wherein the cell walls of the cells 111 have a thickness of 1nm to 1 μm.
Alternatively, the cell wall thickness of the cells 111 may be 1nm, 70nm, 150nm, 300nm, 500nm, 700nm, 1 μm, or the like.
It should be noted that the cell wall thickness of the cells 111 can affect the flexural modulus of the organic aerogel material to some extent. The thicker the cell walls of the cells 111, the greater the flexural modulus of the organic aerogel, which prevents the dome 100 from being deformed during long-term vibration. On the other hand, the thicker the cell wall thickness of the cells 111, the smaller the cell diameter of the cells 111 will be relatively.
The dome top 100 of the present invention has a compressive strength in the thickness direction thereof of more than 10MPa.
The compressive strength of the dome is related to its rigidity. The greater the compressive strength of the dome, the greater the rigidity of the dome.
In the present invention, the dome 100 has a large compressive strength, which is greater than or equal to 10MPa, so that the rigidity of the dome 100 can be increased, and thus, a sound generating apparatus using the dome 100 can have a better high-frequency performance. For example, the compression strength of the dome top 100 may be 12MPa, 15MPa, 20MPa, 22MPa, or the like. The composite dome structure has good vibration stability under the condition that the compression strength reaches 15MPa to 20MPa, and the dome is not easy to deform under the condition of high-frequency vibration, so that the high-frequency performance of the dome is improved.
It should be noted that most of the composite structures of the conventional dome are an aluminum foil layer + an adhesive layer + a foam layer + an adhesive layer + an aluminum foil layer, wherein the adhesive layer is usually made of resin materials such as phenolic resin, organic silicon resin, epoxy resin and the like, so that the long-time use temperature range of the dome is-50 ℃ to 250 ℃.
The ball top 100 of the present invention is a composite structure, wherein the core layer 110 is made of an organic aerogel material. The organic aerogel material can bond to the surface layer 120, and compared to the prior art, the dome 100 of the present invention does not need to be provided with a glue layer. Compared with the existing adhesive layer, the organic aerogel material can keep good structural stability in a wider temperature range. This design may improve the temperature resistance of dome 100. By utilizing the characteristics of the organic aerogel, the ball top 100 of the invention can stably work for a long time in the range of-80 ℃ to 350 ℃. This is clearly a wider range of temperature usage than a composite dome using glue layers, i.e. the dome can be used for a longer period of time in lower or higher temperature environments.
The ball top 100 according to the present invention is a composite structure, wherein the core layer 110 is an organic aerogel layer, and the two surface layers 120 can be directly bonded and fixed by the organic aerogel layer, so that the adhesive layer can be omitted. The organic aerogel layer has a lower density, thereby reducing the weight of the dome 100 and improving the mid-frequency sensitivity. Moreover, the organic aerogel layer has good temperature resistance, so that the vibration consistency of the dome 100 in a high-temperature environment can be ensured, and the sound of separated vibration is avoided. In addition, through the above arrangement, the dome 100 has a higher modulus, so that the mechanical properties of the dome 100 can be improved.
In some examples of the present invention, the organic aerogel material used to form core layer 110 is a porous structure comprising a plurality of cells 111, wherein the cells 111 have a pore size of 5nm to 500 μm.
Alternatively, the cell pores 111 have a pore size of 5nm, 50nm, 100nm, 10 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm,300 μm, 350 μm, 400 μm, 500 μm, or the like. In a preferred embodiment, the cells 111 comprise a plurality of pores having a pore size ranging from 50nm to 150nm, and a plurality of pores having a pore size ranging from 10 μm to 100 μm. The pore size distribution form of the pores can effectively reduce the quality of the core layer on one hand, and can improve the compression modulus and the bending modulus of the core layer as much as possible by utilizing fine pores on the other hand, so that the integral structural strength of the ball top is improved.
In some examples of the invention, the dome 100 has a flexural modulus of 1.5GPa to 20GPa; and/or the modulus density ratio of the dome 100 is 5GPa 3 /g～60GPa.cm 3 /g。
It will be appreciated that the greater the resistance of the dome 100 to bending deformation during operation of the sound generating device, the less likely the dome 100 will deform during vibration.
In the present invention, the core layer 110 made of an organic aerogel material is combined with the two surface layers 120, so that the flexural modulus of the formed dome 100 can be greatly improved. For example, the bending modulus of the dome 100 can reach 1.5 GPa-20 GPa, so that the risk of deformation of the dome 100 in the vibration process can be reduced, the phenomenon of split vibration generated by the sound generating device under polarization or high-frequency vibration can be avoided, and the sound generating performance of the sound generating device is improved.
Alternatively, the flexural modulus of the dome 100 may be designed to be 1.5GPa, 2GPa, 6GPa, 8GPa, 10GPa, 16GPa, 20GPa, or the like.
Preferably, the bending modulus of the dome 100 can be 1.6 GPa-19 GPa, so that the dome 100 is not easy to deform in long-term use, the service life of the dome is prolonged, and the sound production device has good sound production performance.
In an embodiment of the invention, the modulus density ratio of the dome 100 is 5GPa 3 /g～60GPa.cm 3 (ii) in terms of/g. Wherein modulus density ratio = modulus/density.
Optionally, the modulus density ratio of the dome 100Is 5GPa.cm 3 /g、10GPa.cm 3 /g、15GPa.cm 3 /g、20GPa.cm 3 /g、30GPa.cm 3 /g、40GPa.cm 3 /g、45GPa.cm 3 /g、50GPa.cm 3 /g、55GPa.cm 3 /g、60GPa.cm 3 And/g, etc.
The greater the modulus density ratio of the dome 100, the greater the high frequency cut-off frequency of the sound generating device. When the modulus density ratio of the ball top 100 is 5GPa 3 /g～60GPa.cm 3 At/g, the medium frequency response of the sound generating device can be broadened, and clear response to input signals can be obtained in a wider frequency range.
In addition, the substrate for fabricating the dome 100 is an organic aerogel material, and the organic aerogel material has a plurality of criss-cross hole network structures therein, and the porous network structures enable the organic aerogel material to have a low density characteristic compared to the conventional dome material, such as a metal foil and an engineering material. Under the same size condition, the organic aerogel material can reduce the mass of the ball top to the maximum extent, thereby realizing the effects of reducing the resonance frequency of the sound generating device and improving the medium-frequency sensitivity of the sound generating device. The scheme provided by the embodiment of the invention can ensure that the sounding device has medium-frequency sensitivity and high-frequency sensitivity.
In some examples of the present invention, as shown in fig. 3, the core layer 110 has a flexural modulus of 30MPa to 600MPa, and the core layer 110 has a compressive modulus of 30MPa to 600MPa in a thickness direction thereof; and/or the compression modulus of the core layer 110 along the direction parallel to the surface layer is 30MPa to 200MPa.
In the present invention, the organic aerogel material used to fabricate the dome 100 is directionally arranged in a direction perpendicular to the surface layer of the dome 100 to form a network structure, such that the formed core layer 110 has a relatively large flexural modulus, and the core layer 110 has a relatively large compressive modulus in the thickness direction of the core layer 110 and in the direction parallel to the surface layer of the core layer.
That is to say, in the ball top 100 of the present invention, the core layer 110 itself has a suitable flexural modulus and a suitable compressive modulus, so that the risk of deformation of the core layer 110 during the vibration process can be reduced, and further, the phenomenon of split vibration generated by polarization or high-frequency vibration of the ball top can be avoided, which is beneficial to improving the sound production performance of the sound production device.
In some examples of the invention, the peel force between the core layer 110 and any of the skin layers 120 is > 200g/25mm at room temperature.
In the ball top of the present invention, the core layer 110 is made of an organic aerogel material, and the organic aerogel material has a physical effect, a chemical bond, and a micro-mechanical adhesion with the surface layer, which can perform an adhesion effect. These features allow the core layer 110 and the two skin layers 120 to be directly adhesively secured without the need to separately introduce a glue layer between the core layer 110 and each of the skin layers 120. That is, although the dome 100 of the present invention has a composite structure, it does not need to be provided with an adhesive layer, so that the thickness of the dome 100 can be reduced. The aerogel material used in the present invention can make the formed dome 100 thinner and lighter while ensuring a stronger bond with the surface layer 120.
In some examples of the invention, the dome 100 has a thickness of 10 μm to 300 μm; and/or the ratio of the thickness of the core layer 110 to the total thickness of the dome 100 is 1/6 to 1/3.
For example, the thickness of the dome 100 may be 10 μm, 50 μm, 90 μm, 130 μm, 170 μm, 210 μm, 250 μm,300 μm, etc., which is not limited in the embodiments of the present invention.
Preferably, the dome 100 has a thickness of 30 μm to 100. Mu.m.
The thickness of the core layer 110 made of the organic aerogel material accounts for 1/3-1/6 of the total thickness of the ball top 100, and when the thickness of the core layer 110 is smaller, the weight reduction effect on the ball top 100 is poorer, and the sensitivity of the sound generating device is reduced. When the core layer 110 is thick, the rigidity of the entire dome 100 may be poor due to insufficient rigidity of the core layer 110 compared to the surface layer 120, which may result in poor high frequency of the sound generating apparatus. Alternatively, the ratio of the thickness of the core layer 110 to the total thickness of the dome 100 may be 1/6, 1/5, 1/4, 1/3, etc.
In some examples of the present invention, the base material of which the core layer 110 of the dome 100 is made may be an organic aerogel material including at least one of polyimides, polyamides, polyesters, aldehydes, polyolefins, and polysaccharides.
In the present invention, the base material of the dome top 100 is organic aerogel, and the kind of the organic aerogel includes at least one of polyimide, polyamide, polyester, aldehyde, polyolefin, and polysaccharide.
The organic aerogel is an organic polymer material formed by a sol-gel method. During the preparation process, the gas replaces the liquid phase in the gel, and then the solid material with the nano-scale porous structure is formed. This material is the organic aerogel material used in the present invention.
In the invention, the organic aerogel can be made of a high molecular organic material, has the characteristics of porosity and light weight, has certain rigidity compared with an inorganic aerogel material, can be applied to preparing the ball top, enables the ball top to have the characteristics of light weight and high strength, and can meet the strength, rigidity and damping performance required by vibration of a vibration system in the sound generating device.
In practical applications, one or more of the organic polymer materials can be selected according to the practical requirements of the dome 100.
In some examples of the invention, the backbone of the organic aerogel material contains an imide ring that is an aliphatic imide and/or an aromatic imide.
Wherein the structure of the aliphatic imide comprises:
wherein the structure of the aromatic imide comprises:
in view of the molecular structural formulae of the aliphatic polyimide and the aromatic polyimide, both the aliphatic polyimide and the aromatic polyimide have an imide ring structure. When the main chain of the organic aerogel material contains imide rings, the polyimide aerogel material which is ultra-light and has a highly porous staggered network structure can be formed. The material is suitable for sound production devices due to the characteristics of excellent thermal stability, mechanical property, dimensional stability, chemical stability, insulativity and the like.
Under the same size condition, the polyimide organic aerogel material can reduce the mass of the dome 100 to the maximum extent, thereby achieving the effects of reducing the resonance frequency of the sound generating device and improving the medium-frequency sensitivity of the sound generating device.
In addition, the polyimide aerogel is a polymer with an imide structure on a molecular chain segment, and has excellent high and low temperature resistance. Thus, when the working temperature of the sound generating device is continuously increased, the dome 100 can still maintain a high modulus, and the phenomena of segmentation vibration and forward movement of high-frequency cut-off frequency caused by reduction of the modulus of the dome due to temperature increase are avoided. Moreover, the ball top 100 of the polyimide aerogel material is stable in mechanical property and high in chemical stability, and the using effect and the service life of the sound generating device are effectively improved.
In practical applications, the organic aerogel substrate for preparing the dome top 100 may be prepared from one of aliphatic polyimide and aromatic polyimide, or may be prepared by mixing two materials, which is not limited in the present invention.
In addition, it should be noted that, the dome 100 made of the organic aerogel material is easy to form based on the characteristic of the organic aerogel material, so that the forming process of the dome 100 is simple, the dome 100 can be made into a specific shape according to needs, and the yield is high. Because the process is simple, the cost can be properly reduced, and the popularization and application of the organic aerogel material in sound production devices such as micro speakers and other products are expanded.
In some examples of the present invention, the core layer 110 of the dome 100 may further include a filler including at least one of a reinforcing material, an electrically conductive material, and a thermally conductive material.
When the core layer 110 further includes a reinforcing material, the reinforcing material may be reinforcing fibers and/or reinforcing particles. Wherein the reinforcing fiber is at least one of chopped fiber, continuous fiber, fabric and non-woven fabric. The reinforcing particles are at least one of inorganic particles of boron nitride, silicon carbide, carbon black, alumina and metal particles.
It should be noted that the ratio of the reinforcing material in the core layer 110 may be 0, that is, the core layer 110 is entirely made of the organic aerogel material. In addition, the proportion of the reinforcing material in the core layer 110 may be flexibly adjusted according to the requirement, which is not limited in the embodiment of the present invention.
It should be noted that when a reinforcing material is added to the organic aerogel material, as the proportion of the reinforcing material in the organic aerogel material increases, the flexural modulus and compressive strength of the resulting dome 100 tend to increase first and then decrease. This is because: as the proportion of the reinforcing material in the dome 100 increases, the reinforcing fiber reinforcing effect becomes significant, and thus, the flexural modulus and the compressive strength of the dome 100 increase. When the proportion of the reinforcing material in the dome 100 is too large, the proportion of the organic aerogel is reduced, and thus the aerogel having a reduced bonding effect may become very weak or may not be formed, and at this time, the flexural modulus and the compressive strength of the dome 100 may be low. Thus, it is desirable to reasonably control the mass fraction of reinforcing material in the dome 100.
In some examples of the invention, the conductive material is at least one of carbon black, carbon fiber, flake graphite, metal particles, nickel-coated graphite powder, nickel-coated carbon fiber, carbon black, metal powder, metal foil, and metal fiber. By adding a conductive material to the organic aerogel material, the formed dome 100 can have a certain conductivity.
In some examples of the invention, the thermally conductive material is a metallic filler or an inorganic non-metallic filler.
In the present invention, the base material of the core layer 110 is an organic aerogel material. Organic aerogel material has anisotropy, as shown in fig. 3, organic aerogel material is oriented along the direction perpendicular to the surface of the dome, and the heat conduction effect of organic aerogel material can be increased by adding heat conduction material into organic aerogel material, so that the formed dome has good heat conduction.
Optionally, the heat conductive material may be a metal filler including at least one of aluminum, copper, silver, magnesium, tin, lead, and iron.
That is, when forming the core layer 110 of the dome 100, a certain amount of metal filler may be added to the organic aerogel material, where the metal filler may be used as a thermal conductive material to improve the thermal conductivity of the core layer 110. The metal filler has high thermal conductivity and can conduct heat through the movement of a large number of free electrons.
After the addition of the at least one metal filler to the organic aerogel material, the thermal conductivity of the material is significantly increased compared to an organoaerogel material without the addition of the metal filler.
That is to say, through adding one or more above-mentioned metal fillers in organic aerogel material as the heat conduction material to make metal fillers arrange along organic aerogel material's orientation direction, so, can obviously promote organic aerogel material's heat conductivility, and then can make the dome have the high characteristics of coefficient of heat conductivity.
In some examples of the invention, the thermally conductive material may also be an inorganic non-metallic filler comprising at least one of boron nitride, boron carbide, silicon carbide, alumina, graphite, carbon nanotubes, graphene, and nanocarbon powder.
That is, the heat conductive material is not limited to the above-described metal filler, and the heat conductive material may also be selected from inorganic non-metal fillers. The various inorganic nonmetallic fillers have high thermal conductivity and excellent heat resistance and thermal conductivity, and when the inorganic nonmetallic fillers are used as fillers and added into the organic aerogel to form the core layer 110, the dome 100 can have the characteristic of high thermal conductivity.
In addition, in the present invention, one or more of a reinforcing material, an electrically conductive material, and a thermally conductive material may be added to the core layer 110 of the dome 100. In some examples of the present invention, the material of the two surface layers 120 of the dome 100 may be at least one of a metal material, an engineering plastic material, and a fiber material. The skin layer 120 is preferably an aluminum foil material. The material of the two surface layers 120 may be the same.
The embodiment of the invention also provides a preparation method of the dome, which comprises the following steps:
s1, selecting dianhydride and diamine monomers, a cross-linking agent, a dispersing agent and other auxiliary agents to polymerize in a certain proportion to obtain the polyamic acid saline gel. Wherein the solid content of the polyimide wet gel is 3-40%.
Optionally, the molar ratio of dianhydride monomer to diamine monomer is (1-1.2): 1.
alternatively, the dianhydride monomer is at least one of pyromellitic dianhydride, 3', 4' -biphenyltetracarboxylic dianhydride, 3'4,4' -benzophenone tetracarboxylic dianhydride, 4 '-hexafluoroisopropyl phthalic anhydride, 4' -diphenyl ether dianhydride, and hexafluoro dianhydride.
Alternatively, the diamine monomer is 4,4' -diaminoanisole, 2' -dimethyl-4, 4' -diaminobiphenyl, 4-diaminodiphenyl ether, p-phenylenediamine, 2' -bis (4-aminophenyl) hexafluoropropane, 2- (4-aminophenyl) -5-aminobenzimidazole, or 2,2' -bis- (trifluoromethyl) -4,4' -diaminobiphenyl, 4' -diaminodiphenyl sulfone, 1, 4-diaminobenzene, 2' -bis [4- (4-aminophenoxy) phenyl 6-yl ] propane and 9,9' -bis (4-aminophenyl) fluorene.
And S2, spraying or coating the polyimide wet gel obtained in the step S1 on the surface of one surface layer 120, and then compounding the other surface layer 120 with the polyimide wet gel to obtain a composite structure.
And S3, freeze-drying the composite structure obtained in the step S2, shaping, and performing a thermal amination process to finally obtain the molded polyimide aerogel-containing spherical roof 100. The dome 100 has a core layer 110 of polyimide aerogel and two surface layers 120 compounded on both sides of the core layer 110.
Wherein the freeze-drying conditions are as follows: the temperature is less than or equal to 15 ℃, the vacuum degree is less than or equal to 500Pa, and the time is 0.5h to 10h. The conditions of the thermal imidization are as follows: the temperature is 250-350 ℃, and the time is 0.5-1.5 h.
An embodiment of the present invention further provides a diaphragm assembly, which may be applied to a sound generating apparatus, where the diaphragm assembly, as shown in fig. 5 and 6, includes: a diaphragm 200 and the dome 100 of any of the above embodiments, wherein the dome 100 is adhered to the diaphragm 200; or, the dome 100 and the diaphragm 200 are integrally injection-molded.
Alternatively, the dome 100 may be bonded to the diaphragm 200 by using an adhesive such as glue or tape. The bonding width of the ball top 200 and the vibrating diaphragm 100 is not less than 1mm, so that the bonding firmness of the ball top and the vibrating diaphragm can be improved.
Of course, the dome 100 may be integrally injection-molded with the diaphragm 200. This kind of mode structural stability is high, at sound generating mechanism's sound production in-process, avoids the vibrating diaphragm subassembly circumstances such as polarization to appear.
The diaphragm 200 may be made of engineering plastic, for example.
The engineering plastics include, for example, polyetheretherketone (peek), PAR, and the like.
The diaphragm 200 may also be made of an elastomeric material.
The elastomer material includes, for example, thermoplastic polyurethane elastomer (tpu), thermoplastic polyester elastomer (tpee), rubber, and the like.
In addition, the diaphragm 200 may also be made of an adhesive film.
The adhesive film includes, for example, an acrylate-based adhesive, a silicone-based adhesive, and the like.
Of course, the diaphragm 200 may also be formed by compounding the above materials, which is not limited in the present invention.
In the invention, the thickness of the diaphragm 200 can be designed to be between 0.01mm and 0.5mm, and the diaphragm can be suitable for being applied to the vibration space of most of sound generating devices in the thickness range.
For example, the thickness of the diaphragm 200 is 0.01mm, 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, and the like, which is not limited in this embodiment of the present invention.
The ball top 100 of the present invention is a composite structure, the organic aerogel material is used as the core layer 110, and the surface layer 120 can be directly bonded to two sides of the core layer 110, so that a glue layer connecting the core layer 110 and the surface layer 120 can be omitted, the ball top 100 can have lighter weight, and has better intermediate frequency sensitivity. Meanwhile, the dome top 100 also has excellent high and low temperature resistance. When the sound generating device works for a long time, the temperature in the sound generating device is continuously increased, but the ball top 100 provided by the invention can keep higher strength at a higher temperature for a long time, so that the phenomena of segmentation vibration and forward movement of high-frequency cut-off frequency caused by reduction of the modulus of the ball top are avoided.
The embodiment of the invention also provides a sound production device which comprises the vibrating diaphragm component.
The sound generating device provided by the embodiment of the invention can be used for various electronic equipment.
The embodiment of the invention also provides electronic equipment which comprises the sound generating device.
The electronic device may be, for example, a mobile phone, a notebook computer, a tablet computer, a VR (virtual reality) device, an AR (augmented reality) device, a TWS (true wireless bluetooth) headset, a smart speaker, and the like, which is not limited in this respect.
In order to make the technical scheme and the corresponding technical effects of the invention more clear, the invention specifically provides the following examples and comparative examples to specifically illustrate the technical scheme.
Fig. 4 shows an example of a ball top, and ball top 100 includes a core layer 110 and two skin layers 120 disposed on opposite sides of core layer 110, where core layer 110 is made of an organic aerogel material and skin layers 120 are made of aluminum foil. The dome in the comparative example comprises a foam layer and aluminum foil layers bonded to both sides of the foam layer by glue layers. The dome thickness is the same in the examples and comparative examples, and the thickness of the core layer 110 is the same as the thickness of the foam layer + two glue layers in the comparative examples, and the thickness of the skin layer 120 is the same as the thickness of the aluminum foil layer in the comparative examples.
Example (b):
the manufacturing method of the dome in the embodiment is as follows:
step S1, dissolving 180.22g (0.9 mol) of 4, 4-diaminodiphenyl ether in 1L of N-methylpyrrolidone, and adding 294g (1 mol) of 3,3', 4' -biphenyltetracarboxylic dianhydride under stirring, wherein 3,3', 4' -biphenyltetracarboxylic dianhydride is added in small amounts for multiple times, for example; polymerizing the resultant mixture in an ice-water bath for about 5 hours to obtain a polymerization reaction product, and adding 8g (0.02 mol) of 1,3,5- (triaminophenoxy) benzene crosslinking agent to the obtained polymerization reaction product to obtain a polyamic acid salt solution; slowly pouring the prepared polyamic acid salt solution into acetone, precipitating to obtain precipitated filaments, namely the polyimide material, and drying the polyimide material to constant weight.
S2, preparing 50g of polyamic acid salt into polyamic acid gel with the mass fraction (solid content) of 15%, heating the polyamic acid gel to 60 ℃, spraying the polyamic acid gel onto one surface of one surface layer 120, and then compounding one surface layer 120 to form a composite structure; wherein the surface layer 120 is an aluminum foil.
And S3, freezing the composite structure prepared in the step S3 at the temperature of minus 40 ℃ for 1h, drying the composite structure for 2h under the vacuum degree of less than 100Pa, performing thermal imidization on the composite structure for 1h at the temperature of 150 ℃, and performing thermal imidization on the composite structure for 2h at the temperature of 300 ℃ to obtain the organic aerogel ball top 100 for the sound generating device.
Comparative example:
and respectively bonding the two surfaces of the foam layer with aluminum foils through adhesive layers, and then carrying out hot pressing at 140 ℃, wherein the adhesive layers are phenolic resin.
The performance index of the example is compared with the dome of the comparative example by table 1 below.
TABLE 1 comparison of the examples and comparative examples Performance index
| Material | Examples | Comparative example |
| Thickness of ball top/μm | 150 | 150 |
| Ball top mass/mg | 22.4 | 32.5 |
| Thickness of aluminum foil/μm | 10 | 10 |
| Aerogel thickness/μm | 130 | / |
| Gel layer + foam + gel layer thickness/[ mu ] m | / | 130 |
| Flexural modulus/GPa of the dome | 12.3 | 10.2 |
| Modulus density ratio/GPa.cm of ball top 3 /g | 33.9 | 19.4 |
| Breakdown temperature/. Degree.C | 320 | 200 |
From the above table 1, the following conclusions can be drawn:
firstly, comparing performance indexes:
(1) The domes of the examples had the smallest mass compared to the domes of the comparative examples, given the same thickness of the aluminum foil layer.
(2) Compared with the dome of the comparative example, the mass of the dome can be reduced by 10.1mg, the flexural modulus can be improved by 2.1GPa, and the modulus density ratio can be increased by 14.5GPa.cm by replacing the glue layer, the foam layer and the glue layer in the comparative example with the polyimide aerogel with the same thickness in the example 3 G, and has better intermediate frequency sensitivity.
(3) The polyimide aerogel in the spherical top of the embodiment is a polymer with an imide structure on a molecular chain segment, has excellent high and low temperature resistance, and has a long-time use temperature of-80-350 ℃. The ball top of the comparative example is formed by matching aluminum foil, an adhesive layer, a foam layer, an adhesive layer and aluminum foil, wherein the adhesive layer is made of phenolic resin and is used at the temperature of minus 50 ℃ to 200 ℃ for a long time. When the loudspeaker works for a long time, the temperature is continuously increased, the ball top of the embodiment can keep higher strength, and the phenomena of segmentation vibration and forward movement of high-frequency cut-off frequency caused by reduction of the modulus of the ball top are avoided.
Secondly, frequency response curve comparison:
the dome of the example and the dome of the comparative example were assembled with the corrugated rim made of a polyurethane film to form a diaphragm assembly, and the diaphragm assembly was assembled into sound emitting devices of the same type, as shown in fig. 7, and the frequency response curves of the two were as follows:
as can be seen from fig. 7, the sound-emitting device using the dome of the example has a sensitivity of about 2dB after 700Hz, higher than that using the dome of the comparative example. When the sound generating device works for a long time, the temperature is continuously increased, the ball top of the embodiment can keep higher strength, and the phenomena of segmentation vibration and forward movement of high-frequency cut-off frequency caused by reduction of the modulus of the ball top are avoided.
In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.
Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (18)
1. The top dome for the sound production device is characterized by comprising a core layer and two surface layers, wherein the two surface layers are respectively positioned on two sides of the core layer in the thickness direction of the core layer;
the core layer is at least made of an organic aerogel material, the core layer is internally provided with a porous structure, the porous structure comprises cells, and the cell wall thickness of the cells is 1nm-1 μm;
the compressive strength of the dome in the thickness direction thereof is greater than 10MPa.
2. The dome according to claim 1, wherein the pore size of the cells is 5nm to 500 μm.
3. The dome of claim 1, wherein the peel force between the core layer and the skin layer is > 200g/25mm at room temperature.
4. The dome of claim 1, wherein the organic aerogel material comprises at least one of polyimides, polyamides, polyesters, aldehydes, polyolefins, and polysaccharides.
5. The dome of claim 1, wherein the backbone of the organic aerogel material comprises an imide ring, and wherein the imide ring is an aliphatic imide and/or an aromatic imide.
6. The dome of claim 5, wherein the structure of the aliphatic imide comprises:
7. the dome according to claim 5, wherein the structure of the aromatic imide comprises:
8. the dome of claim 1, wherein the dome has a thickness of 10-300 μ ι η;
and/or the ratio of the thickness of the core layer to the total thickness of the ball top is 1/6-1/3.
9. The dome of claim 1, wherein the dome has a flexural modulus of 1.5GPa to 20GPa;
and/or the modulus density ratio of the ball top is 5GPa 3 /g～60GPa.cm 3 /g。
10. The dome of claim 1, wherein the core layer has a flexural modulus of 30MPa to 600MPa;
and/or the compression modulus of the core layer along the thickness direction is 30 MPa-600 MPa;
and/or the compression modulus of the core layer along the direction parallel to the surface layer is 30 MPa-200 MPa.
11. The dome of claim 1, wherein the core layer further comprises a filler comprising at least one of a reinforcing material, an electrically conductive material, and a thermally conductive material.
12. The dome of claim 11, wherein the reinforcing material is reinforcing fibers and/or reinforcing particles;
the reinforced fiber is at least one of chopped fiber, continuous fiber, fabric and non-woven fabric;
the reinforcing particles are at least one of inorganic particles of boron nitride, silicon carbide, carbon black, aluminum oxide and metal particles.
13. The dome of claim 11, wherein the conductive material is at least one of carbon black, carbon fiber, flake graphite, metal particles, nickel-coated graphite powder, nickel-coated carbon fiber, carbon black, metal powder, metal foil, and metal fiber.
14. The dome of claim 11, wherein the thermally conductive material is a metallic filler or an inorganic non-metallic filler;
the metal filler comprises at least one of aluminum, copper, silver, magnesium, tin, lead and iron;
the inorganic non-metallic filler comprises at least one of boron nitride, boron carbide, silicon carbide, aluminum oxide, graphite, carbon nano tubes, graphene and nano carbon powder.
15. The dome of claim 1, wherein the material of the surface layer is at least one of a metal material, an engineering plastic material and a fiber material.
16. The utility model provides a vibrating diaphragm subassembly, is applied to sound generating mechanism, its characterized in that includes:
vibrating diaphragm; and
the dome of any one of claims 1-15, which is adhesively attached to the diaphragm or integrally injection molded.
17. A sound generating device comprising a diaphragm assembly as claimed in claim 16.
18. An electronic device characterized by comprising the sound emitting apparatus according to claim 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210767706.5A CN115243165A (en) | 2022-06-30 | 2022-06-30 | A ball top, vibrating diaphragm subassembly, sound generating mechanism and electronic equipment for sound generating mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210767706.5A CN115243165A (en) | 2022-06-30 | 2022-06-30 | A ball top, vibrating diaphragm subassembly, sound generating mechanism and electronic equipment for sound generating mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115243165A true CN115243165A (en) | 2022-10-25 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210767706.5A Pending CN115243165A (en) | 2022-06-30 | 2022-06-30 | A ball top, vibrating diaphragm subassembly, sound generating mechanism and electronic equipment for sound generating mechanism |
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| Country | Link |
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| CN (1) | CN115243165A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118344730A (en) * | 2024-06-17 | 2024-07-16 | 瑞声光电科技(常州)有限公司 | Reinforcing dome and speaker |
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| CN112866879A (en) * | 2021-01-04 | 2021-05-28 | 歌尔股份有限公司 | Ball top, vibrating diaphragm and loudspeaker |
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| JPH07203584A (en) * | 1993-12-29 | 1995-08-04 | Yamaha Corp | Speaker diaphragm |
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| CN118344730A (en) * | 2024-06-17 | 2024-07-16 | 瑞声光电科技(常州)有限公司 | Reinforcing dome and speaker |
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