Diaphragm of sound-generating device and sound-generating device

Abstract

The present application discloses a diaphragm of a sound-generating device and a sound-generating device. The diaphragm includes at least one modified siloxane polymer film layer, which is prepared by mixing inorganic hollow microspheres, additives, and a siloxane polymer to form a mixed rubber and then subjecting it to a cross-linking reaction. The particle size of the inorganic hollow microspheres is 1 μm to 60 μm, and the distribution density of the inorganic hollow microspheres in the modified siloxane polymer film layer is 0.15 g / cm 3 ~0.9g / cm 3 The modified siloxane polymer film layer has a maximum creep value of ≤16% under the conditions of a tensile stress of 0.1 MPa and a stretching time of 10 minutes at 23°C. This invention prepares a modified siloxane polymer film layer by cross-linking after mixing inorganic hollow microspheres, additives, and a siloxane polymer to form a rubber compound. This is then used as the diaphragm material. This not only reduces the density of the diaphragm material, improving the mid-frequency sensitivity of the sound-generating device, but also imparts excellent creep resistance to the diaphragm material.

Description

Technical Field

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

[0002] With the increasing demand for high power, waterproof performance and high sound quality of speakers, rubber diaphragms have also been widely used in the field of speakers. However, due to the high density of rubber diaphragms (≥1.2g / cm 3 ), the thickness is relatively thick, which will lead to a large mass of the diaphragm, making the rubber diaphragm vibrate with a high mass in the vibration system, which will result in a low intermediate frequency Fr (frequency response) of the sound-emitting device.

[0003] In addition, the creep resistance of conventional silicone rubber diaphragm materials is average. Under certain conditions, the deformation is large and difficult to recover. That is, the diaphragm made of this material will affect its performance after long-term use or in extreme environments.

[0004] Therefore, a new technical solution is needed to solve the above problems. Summary of the Invention

[0005] One object of the present application is to provide a diaphragm for a sound-generating device.

[0006] Another object of the present application is to provide a sound-generating device composed of the above-mentioned diaphragm.

[0007] In order to achieve the above objectives, this application provides the following technical solutions.

[0008] According to the diaphragm of the sound-emitting device of the first embodiment of the present application, the diaphragm includes at least one modified siloxane polymer film layer, which is prepared by mixing inorganic hollow microspheres, additives and siloxane polymer to form a mixed rubber and then cross-linking the mixed rubber; wherein the particle size of the inorganic hollow microspheres is 1 μm to 60 μm, and the distribution density of the inorganic hollow microspheres in the modified siloxane polymer film layer is 0.15 g / cm 3 ~0.9g / cm 3 The modified siloxane polymer film layer has a maximum creep value of ≤16% when stretched at 23° C., with a tensile stress of 0.1 MPa and a stretching time of 10 min.

[0009] According to some embodiments of the present application, the glass transition temperature of the modified siloxane polymer film layer is ≤-50°C.

[0010] According to some embodiments of the present application, the content of the inorganic hollow microspheres accounts for 5 wt % to 47 wt % of the total amount of the rubber mix.

[0011] According to some embodiments of the present application, the compressive strength of the inorganic hollow microspheres is ≥10 MPa.

[0012] According to some embodiments of the present application, the density of the modified siloxane polymer film layer is 0.5 g / cm 3 ~1.1g / cm 3 .

[0013] According to some embodiments of the present application, the room temperature storage modulus of the modified siloxane polymer film layer is 0.5 MPa to 35 MPa.

[0014] According to some embodiments of the present application, the loss factor of the modified siloxane polymer film layer at room temperature is greater than 0.08.

[0015] According to some embodiments of the present application, the additive includes a cross-linking agent and a reinforcing agent, wherein the cross-linking agent is at least one of peroxide and hydrogen-containing silicone oil; the reinforcing agent is at least one of carbon black, silica, calcium carbonate, barium sulfate, organic montmorillonite, unsaturated carboxylic acid metal salt, talc powder, clay, mica powder, feldspar powder, sulfates, magnetic powder and diatomaceous earth.

[0016] According to some embodiments of the present application, the content of the cross-linking agent accounts for 0.5 wt % to 5.2 wt % of the rubber mix, and the content of the reinforcing agent accounts for 3 wt % to 69 wt % of the rubber mix.

[0017] According to some embodiments of the present application, the diaphragm is a single-layer structure, and the diaphragm is composed of a layer of the modified siloxane polymer film.

[0018] According to some embodiments of the present application, the diaphragm is a composite layer structure, and the diaphragm further includes a membrane layer made of one or more of thermoplastic elastomers, engineering plastics, and thermosetting elastomers.

[0019] According to the second aspect of the embodiment of the present application, the sound-producing device includes a vibration system and a magnetic circuit system coordinated with the vibration system, the vibration system includes a diaphragm and a voice coil coupled to one side of the diaphragm, the magnetic circuit system drives the voice coil to vibrate to drive the diaphragm to produce sound, and the diaphragm is the diaphragm according to the above-mentioned embodiment of the present application.

[0020] According to the third aspect of the present application, the sound-producing device includes a shell and a magnetic circuit system and a vibration system arranged in the shell. The vibration system includes a voice coil, a first diaphragm and a second diaphragm. The top of the voice coil is connected to the first diaphragm. The magnetic circuit system drives the voice coil to vibrate to drive the first diaphragm to produce sound. The two ends of the second diaphragm are respectively connected to the shell and the bottom of the voice coil. The second diaphragm is the diaphragm according to the above-mentioned embodiment of the present application.

[0021] According to the diaphragm of the sound-emitting device in the embodiment of the present application, a modified siloxane polymer film layer is prepared by mixing inorganic hollow microbeads, additives and silicone polymer to form a rubber compound, and then performing a cross-linking reaction. This is used as the diaphragm material, which not only reduces the density of the diaphragm material and improves the mid-frequency sensitivity of the sound-emitting device, but also makes the diaphragm material have excellent anti-creep performance, effectively ensuring the use effect of the diaphragm and the acoustic stability of the sound-emitting device.

[0022] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0024] Figure 1 1 is a creep value comparison curve of a modified siloxane polymer membrane layer and a conventional silicone rubber membrane layer of a diaphragm of a sound-generating device according to an embodiment of the present application;

[0025] Figure 2 1 is a temperature variation curve of the loss factor of the modified siloxane polymer membrane layer and the conventional silicone rubber membrane layer of the diaphragm of the sound-generating device according to the embodiment of the present application;

[0026] Figure 3 1 is a test curve of vibration displacement of different parts of the diaphragm of the sound-generating device at different frequencies according to an embodiment of the present application;

[0027] Figure 4 The following are the test curves of vibration displacement of different parts of conventional silicone rubber diaphragm at different frequencies;

[0028] Figure 5 : is a mid-frequency Fr curve of the modified siloxane polymer film layer with different densities of the diaphragm of the sound-generating device according to an embodiment of the present application;

[0029] Figure 6 is a tensile curve of a modified siloxane polymer film layer of a diaphragm of a sound-emitting device according to an embodiment of the present application;

[0030] Figure 7 Schematic diagram of the overall structure of the sound-generating device according to an embodiment of the present application;

[0031] Figure 8 is a schematic diagram of a partial structure of a sound-generating device according to an embodiment of the present application;

[0032] Figure 9 is a cross-sectional view of a sound-generating device according to an embodiment of the present application;

[0033] Figure 10 1 is an exploded view of a sound-generating device according to an embodiment of the present application.

[0034] Reference numerals

[0035] Sound-generating device 100;

[0036] Housing 10; voice coil 11; first diaphragm 12; second diaphragm 13; magnetic circuit system 14;

[0037] Diaphragm 15 ; surround 151 ; dome 152 . DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0040] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0041] 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.

[0042] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0043] The diaphragm of the sound-emitting device according to the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0044] According to the diaphragm of the sound-generating device of the embodiment of the present application, the diaphragm includes at least one modified siloxane polymer film layer, which is prepared by mixing inorganic hollow microspheres, additives, and siloxane polymer to form a mixed rubber and then cross-linking the mixed rubber. The particle size of the inorganic hollow microspheres is 1 μm to 60 μm, and the distribution density of the inorganic hollow microspheres is 0.15 g / cm 3 ~0.9g / cm 3 The maximum creep value of the modified siloxane polymer film layer under the conditions of 23° C., a tensile stress of 0.1 MPa, and a stretching time of 10 min is ≤16%.

[0045] The diaphragm of the sound-emitting device according to the embodiment of the present application is composed of at least one modified silicone polymer film layer. Specifically, the diaphragm in the present application can be a single-layer structure or a multi-layer composite structure. When the diaphragm is a single-layer structure, the diaphragm is made of a layer of modified silicone polymer film layer of the present application. When the diaphragm is a multi-layer composite structure, the diaphragm includes at least one modified silicone polymer film layer, and the modified silicone polymer film layer in the diaphragm is composited with film layers of other materials. Optionally, when the diaphragm contains multiple layers of modified silicone polymer film layers, the two adjacent modified silicone polymer film layers can be spaced apart, that is, a film layer of other materials can also be set between the two adjacent modified silicone polymer film layers. Of course, the two adjacent modified silicone polymer film layers can also be set in contact with each other. The setting can be selected according to actual usage requirements, and the present application does not impose specific restrictions on this.

[0046] Specifically, the siloxane polymer can form silicone rubber or fluorosilicone rubber. The silicone rubber can be a linear polymer comprising a siloxane backbone and side chain groups. The chemical formula of the siloxane polymer can be the following formula (I).

[0047]

[0048] In formula (I), the unit with a vinyl group in the side chain is a methylvinylsiloxane unit, wherein n and m are natural numbers, and R, R', and R'' are at least one of methyl, vinyl, fluoroalkyl, fluoroaryl, alkylene, aryl, or arylene.

[0049] Among them, the silicone rubber material can be modified by adding inorganic hollow microbeads to the silicone polymer, and the modified silicone polymer film layer is made of the modified silicone rubber. Specifically, by mixing the inorganic hollow microbeads, additives and silicone polymer, a rubber mix can be formed, and the rubber mix can be vulcanized to form modified silicone rubber. In other words, the silicone polymer can form silicone rubber, which is equivalent to the base material of the diaphragm material. After the inorganic hollow microbeads and silicone polymer are mixed, the inorganic hollow microbeads can be dispersed in the base material. Since the density of inorganic hollow microbeads is lower than that of rubber, by adding inorganic hollow microbeads to rubber, the density of the modified silicone polymer film layer can be reduced, resulting in a low-density diaphragm.

[0050] Under the condition that the diaphragm material (modified siloxane polymer film layer) added with inorganic hollow microspheres in this application has the same hardness as the silicone rubber diaphragm material (conventional silicone rubber film layer) without inorganic hollow microspheres in the prior art, the diaphragm of this application has a lower diaphragm density, which can reduce the vibration mass of the diaphragm system. When the diaphragm made of the modified siloxane polymer film layer of this application is applied to a sound-generating device, the sound-generating device can have higher mid-frequency sensitivity.

[0051] Inorganic hollow microspheres are hollow, thin-walled, hard, lightweight spheres with a high strength-to-density ratio. The diaphragm of the sound-generating device of this application is infused with inorganic hollow microspheres, which effectively reduces the density and weight of the rubber, thereby reducing the overall weight of the diaphragm, lowering the vibration mass of the vibration system, and improving the sensitivity of the sound-generating device. The inorganic hollow microspheres can be hollow glass microspheres, hollow ceramic microspheres, or the like. The main component of hollow glass microspheres is borosilicate, which has high temperature resistance.

[0052] Incorporating inorganic hollow microspheres into the silicone polymer forms a dense protective layer on the rubber surface, hindering the penetration of oxygen molecules and effectively improving the aging resistance of the modified silicone polymer film. Furthermore, the high compressive strength of the inorganic hollow microspheres prevents them from being crushed during the mixing process. This ensures uniform dispersion of the inorganic hollow microspheres in the substrate while also reducing the density of the modified silicone polymer film.

[0053] Furthermore, the particle size of the inorganic hollow microspheres can be selected within the range of 1 μm to 60 μm, preferably 5 μm to 30 μm. For example, the particle size of the inorganic hollow microspheres can be 1 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, or 60 μm. In other words, inorganic hollow microspheres of different particle sizes can be selected according to the thickness of the diaphragm to ensure that the inorganic hollow microspheres are evenly dispersed in the substrate.

[0054] In addition, as the size of the inorganic hollow microspheres decreases, the distribution density of the inorganic hollow microspheres in the modified siloxane polymer film layer will increase. By selecting the appropriate size of the inorganic hollow microspheres, the distribution density of the inorganic hollow microspheres in the modified siloxane polymer film layer can be controlled to 0.15 g / cm 3 ~0.9g / cm 3 For example, the distribution density of inorganic hollow microspheres can be: 0.15g / cm 3 , 0.2g / cm 3 , 0.35g / cm 3 , 0.5g / cm 3 , 0.6g / cm 3 , 0.7g / cm 3 , 0.8g / cm 3 or 0.9g / cm 3 To ensure that the inorganic hollow microspheres can effectively reduce the density of the diaphragm, the distribution density of the inorganic hollow microspheres is preferably 0.35 g / cm 3 ~0.8g / cm 3 .

[0055] The maximum creep value of the modified siloxane polymer film layer under the conditions of 23° C., a tensile stress of 0.1 MPa, and a stretching time of 10 minutes is ≤16%.

[0056] Specifically, the maximum creep value of the modified siloxane polymer film layer when stretched under certain conditions is ≤16%. The specific stretching conditions may be an environment of 23° C., a tensile stress of 0.1 MPa, and a stretching time of 10 minutes.

[0057] It should be noted that creep refers to the phenomenon in which a material's deformation increases over time when under constant load (unchanged external load). Creep reflects the material's rheological properties under load, that is, its flow under load. For plastics and other polymers, this reflects their inherent viscoelasticity. Furthermore, a material's creep properties also reflect its stability under temperature changes. Furthermore, the creep limit is the maximum stress a material can withstand within a specified time and temperature, reaching a specified creep deformation or creep rate, reflecting the material's ability to resist high-temperature deformation.

[0058] Since the inorganic hollow microspheres are added to the silicone polymer, the hydroxyl groups on the surface of the inorganic hollow microspheres can form hydrogen bonds with the Si-O groups in the silicone polymer molecular chains, and the inorganic hollow microspheres can form an effective entanglement structure with the rubber molecular chains, thereby reducing the slip between the silicone rubber molecules, improving the ability of the modified silicone polymer film layer to resist deformation, and effectively reducing the creep value of the modified silicone polymer film layer.

[0059] Test index: creep

[0060] Creep curves were obtained by stretching a modified siloxane polymer film layer and a silicone rubber film layer without inorganic hollow microspheres at 23°C under a tensile stress of 0.1 MPa for 10 minutes. Hollow glass microspheres were selected as the inorganic hollow microspheres. It should be noted that hollow glass microspheres are a type of inorganic hollow microsphere. Using either hollow glass microspheres or other inorganic hollow microspheres can equally demonstrate the role played by the inorganic hollow microspheres in the material.

[0061] like Figure 1 As shown, the creep curve of the modified siloxane polymer film of the present application is lower than the creep curve of the silicone rubber film without inorganic hollow microspheres (conventional silicone rubber film). Under the same test conditions, the creep value of the modified siloxane polymer film of the present application is significantly lower than that of the silicone rubber film without inorganic hollow microspheres (conventional silicone rubber film). In other words, the modified siloxane polymer film of the present application has better resistance to deformation, which can effectively ensure the use effect of the diaphragm and thus the acoustic performance of the sound-generating device.

[0062] Therefore, according to the diaphragm of the sound-emitting device according to the embodiment of the present application, a modified siloxane polymer film layer is prepared by mixing inorganic hollow microbeads, additives and silicone polymer to form a rubber compound, and then performing a cross-linking reaction. This is used as the diaphragm material, which not only reduces the density of the diaphragm material and improves the mid-frequency sensitivity of the sound-emitting device, but also makes the diaphragm material have excellent anti-creep performance, effectively ensuring the use effect of the diaphragm and the acoustic stability of the sound-emitting device.

[0063] According to one embodiment of the present application, the compressive strength of the inorganic hollow microspheres is ≥10 MPa.

[0064] In other words, the high compressive strength of inorganic hollow microspheres not only prevents them from being crushed during the mixing process, but also effectively increases the tensile strength of the modified silicone polymer film when added to the siloxane polymer. This high mechanical strength of the diaphragm prevents it from overstretching due to excessive driving forces in extreme environments, further ensuring the diaphragm's effectiveness.

[0065] In some specific embodiments of the present application, the content of the inorganic hollow microspheres accounts for 5 wt % to 47 wt % of the total rubber mix.

[0066] That is, a modified silicone polymer film layer can be prepared by adding inorganic hollow microspheres accounting for 5wt% to 47wt% of the total rubber mix to the silicone polymer. As the amount of inorganic hollow microspheres added increases, the density of the modified silicone polymer film layer decreases. By controlling the density of the added inorganic hollow microspheres, a diaphragm material with desired performance can be obtained. The content of inorganic hollow microspheres can be any value between 5wt% and 47wt%, for example, the content of inorganic hollow microspheres can be 5wt%, 10wt%, 15wt%, 20wt%, 30wt%, 40wt% or 47wt%.

[0067] It should be noted that, since the density of inorganic hollow microspheres is much lower than that of rubber, the density of the rubber material will decrease significantly as the amount of inorganic hollow microspheres added increases. Specifically, when the content of inorganic hollow microspheres is low (less than 5wt%), it has little effect on the density of the diaphragm material, and the diaphragm still has a relatively high density. When the content of inorganic hollow microspheres is too high (greater than 47wt%), due to its excessive mechanical strength, the maximum amplitude that can be achieved by the prepared diaphragm under the same driving force is reduced, which reduces the low frequency Fr of the sound-generating device. Moreover, the excessive addition of inorganic hollow microspheres will significantly reduce the density of the modified silicone polymer film layer, and the prepared diaphragm will have low elongation at break and strength, and will be prone to reliability issues such as collapse and film breakage.

[0068] Therefore, by using a modified silicone polymer film layer prepared by adding 5wt% to 47wt% of inorganic hollow microbeads to the total rubber mixture as the diaphragm material, the density and strength of the diaphragm can be achieved at the same time, effectively ensuring the excellent mid-frequency and low-frequency performance of the diaphragm.

[0069] According to one embodiment of the present application, the modified siloxane polymer film layer has a tensile strength of 2 MPa to 45 MPa and a tear strength of 15 N / mm to 100 N / mm when broken.

[0070] That is to say, by adding inorganic hollow microbeads to the silicone polymer to form a low-density rubber diaphragm material, when the diaphragm material is broken, its tensile strength can be controlled within the range of 2MPa to 45MPa, and the tear strength can be controlled within the range of 15N / mm to 100N / mm. For example, the tensile strength of the modified silicone polymer film layer can be 2MPa, 6MPa, 10MPa, 16MPa, 20MPa, 25MPa, 30MPa, 40MPa or 45MPa. The tear strength of the modified silicone polymer film layer can be 15N / mm, 30N / mm, 45N / mm, 50N / mm, 70N / mm, 90N / mm or 100N / mm. That is, the modified silicone polymer film layer can have suitable mechanical properties, and the diaphragm prepared therefrom is not prone to problems such as film breakage during the use of the sound-generating device, effectively ensuring the reliability of the diaphragm.

[0071] According to one embodiment of the present application, the room temperature storage modulus of the modified siloxane polymer film layer is 0.5 MPa to 35 MPa. By adding inorganic hollow microbeads to the siloxane polymer to form a low-density rubber diaphragm material, the room temperature storage modulus of the modified siloxane polymer film layer can be within the range of 0.5 MPa to 35 MPa, ensuring the diaphragm has good resilience.

[0072] In other words, the diaphragm made with this modified siloxane polymer film layer has excellent damping performance and resilience, effectively suppressing polarization during the vibration and sound generation process, and achieving greater consistency in the vibration system. The vibration consistency of each part of the diaphragm of this application is improved, effectively reducing distortion in the sound-generating device.

[0073] In some specific embodiments of the present application, the hardness of the modified siloxane polymer film layer is 35A to 80A.

[0074] It should be noted that the sound-producing device can be a loudspeaker. The loudspeaker includes a vibration system and a magnetic circuit system that cooperates with the vibration system. The vibration system includes the diaphragm provided in this application, which can be a ring-shaped diaphragm or a flat diaphragm. Loudspeakers using the diaphragm provided in this application have advantages such as good sound quality and durability.

[0075] In a specific embodiment of the present application, when the hardness of the diaphragm material is controlled within the range of 35A to 80A and the room temperature storage modulus is within the range of 0.5MPa to 35MPa, the F0 of the speaker can reach 500Hz to 1500Hz, thereby enabling the speaker to have excellent low-frequency performance.

[0076] In some specific embodiments of the present application, the glass transition temperature of the modified siloxane polymer film layer is ≤-50°C.

[0077] In other words, by adding inorganic hollow microspheres to a siloxane polymer to form a low-density rubber diaphragm material, and then adjusting the amount of inorganic hollow microspheres added, the glass transition temperature of the modified siloxane polymer film layer can be controlled to ≤ -50°C. Preferably, the glass transition temperature of the modified siloxane polymer film layer can be ≤ -55°C. For example, the glass transition temperature of the modified siloxane polymer film layer can be -50°C, -52°C, -55°C, etc.

[0078] Therefore, by controlling the glass transition temperature of the modified silicone polymer film layer to ≤-50°C, the diaphragm can maintain a high elastic state at room temperature, so that the diaphragm has good resilience. When the operating temperature of the diaphragm is lower than 0°C, the speaker diaphragm can always maintain good rubber elasticity during operation, so that the speaker exhibits higher sound quality. At the same time, the risk of damage to the speaker diaphragm in a low temperature environment is reduced, and the reliability is higher. In addition, a diaphragm with a lower glass transition temperature can ensure that the modulus consistency of the diaphragm material is high when the diaphragm material is working above the glass transition temperature, and the F0 of the diaphragm prepared from the diaphragm material has better stability in the entire temperature range.

[0079] In some specific embodiments of the present application, the loss factor of the modified siloxane polymer film layer at room temperature is greater than 0.08.

[0080] It should be noted that at room temperature, conventional silicone rubber diaphragms are in a highly elastic state, allowing for easy molecular chain movement. However, due to their low molecular polarity, flexible molecular chains, and minimal steric hindrance, conventional silicone rubber and fluorosilicone rubber exhibit low damping. Due to the low damping of conventional silicone rubber diaphragms, their loss factor is generally less than 0.08, indicating low damping.

[0081] like Figure 2As shown, inorganic hollow microbeads are added to the modified silicone polymer film layer of the present application, and the hydroxyl groups on the surface of the inorganic hollow microbeads form hydrogen bonds with the Si-O groups in the silicone rubber molecular chains, and an effective entanglement structure can be formed between the inorganic hollow microbeads and the rubber molecular chains, which increases the capacity required for the molecular chains to move, resulting in the modified silicone polymer film layer having good damping performance, and its loss factor at room temperature is greater than 0.08, preferably greater than 0.1. The modified silicone polymer film layer of the present application has excellent damping performance, which makes the diaphragm have a lower impedance value.

[0082] Therefore, the diaphragm made of the diaphragm material with a higher damping value has a lower impedance curve, which can improve the damping properties of the modified silicone polymer film layer. The vibration system can effectively suppress the polarization phenomenon during the vibration and sound generation process, and the consistency of the vibration system is better.

[0083] Furthermore, the loss factor can be adjusted in conjunction with the diaphragm thickness to further optimize diaphragm performance. Generally, a higher loss factor indicates better material damping. Improving the damping of the diaphragm material helps reduce polarization during vibration, lowering product distortion and improving audio yield. For example, the loss factor can be 0.08, 0.09, 0.10, 0.11, 0.12, or 0.19.

[0084] It should be noted that the loss factor test method can be a conventional test method, for example: measured by dynamic mechanical test DMA, measured according to ASTM D5026-15 standard, tensile fixture, test temperature range -50℃~100℃, heating rate 3℃ / min

[0085] Furthermore, the diaphragm of the present application has excellent damping performance, such as Figure 1 As shown, the diaphragm can be a rectangular folded ring diaphragm. The horizontal axis is frequency (Hz) and the vertical axis is loudness displacement (mm). Tests are performed at the edge and center positions of the center of the diaphragm to obtain test curves of vibration displacement of different parts of the diaphragm at different frequencies. The inorganic hollow microspheres here are hollow glass microspheres. It should be noted that hollow glass microspheres are a type of inorganic hollow microspheres. The use of hollow glass microspheres or other inorganic hollow microspheres can also reflect the role of inorganic hollow microspheres in the material.

[0086] The effect of adding inorganic hollow microspheres to the diaphragm material on the damping properties of the diaphragm is as follows:

[0087] like Figure 3 As shown, Figure 3 These are test curves of vibration displacement of different parts of the modified siloxane polymer film layer of this application at different frequencies. Figure 3The various curves in the figure are concentratedly distributed, which shows that the vibration consistency of the various parts of the diaphragm of the sound-emitting device of the present application is better. During the vibration process, the diaphragm swings less, and the sound quality and listening stability are better.

[0088] like Figure 4 As shown, Figure 4 This is the test curve of the vibration displacement of different parts of the conventional silicone rubber diaphragm at different frequencies. Figure 4 The various curves in the diagram are relatively dispersed and have large fluctuations. Therefore, the vibration consistency of the diaphragm made of the diaphragm material of the present application is better, ensuring the acoustic performance of the sound-generating device.

[0089] According to one embodiment of the present application, the density of the modified siloxane polymer film layer is 0.5 g / cm 3 ~1.1g / cm 3 .

[0090] That is to say, by adding inorganic hollow microspheres to the siloxane polymer to form a low-density rubber diaphragm material, and then by adjusting the amount of inorganic hollow microspheres added, the density of the modified siloxane polymer film layer can be controlled at 0.5g / cm 3 ~1.1g / cm 3 For example, the density of the modified silicone polymer film layer can be 0.5 g / cm 3 , 0.7g / cm 3 , 0.8g / cm 3 , 0.9g / cm 3 , 1g / cm 3 or 1.1 g / cm 3 Thus, through the above-mentioned setting, the weight of the modified siloxane polymer film layer can be reduced by 30%-50%, which has a good weight reduction effect and greatly improves the sound sensitivity of the diaphragm.

[0091] Table 1 shows the effect of different addition amounts of inorganic hollow microspheres on the density of the silicone rubber film. The inorganic hollow microspheres here are hollow glass microspheres. It should be noted that hollow glass microspheres are a type of inorganic hollow microspheres. Using hollow glass microspheres or other inorganic hollow microspheres can also reflect the role played by inorganic hollow microspheres in the material.

[0092] As shown in Table 1, with the increase of the addition amount of inorganic hollow microspheres, the density of the silicone rubber film layer gradually decreases.

[0093] The influence of the content of inorganic hollow microspheres in the diaphragm material on the density of the diaphragm is as follows:

[0094] Table 1

[0095] Hollow glass microsphere addition amount (wt%) 0 5 10 40 47 <![CDATA[Rubber density (g / cm 3 )]]> 1.15 1.07 0.95 0.61 0.49

[0096] It should be noted that when the density of the low-density rubber is low (less than 0.5 g / cm 3 ), the content of inorganic hollow microspheres is high, the elongation at break and strength of the prepared diaphragm are low, and reliability problems such as collapse and rupture are prone to occur. When the content of inorganic hollow microspheres is low, the diaphragm density is high (>1g / cm 3 ), at the same thickness, the diaphragm prepared in the present application has a smaller weight reduction ratio compared with the conventional silicone rubber diaphragm, and does not significantly improve the intermediate frequency Fr of the sound-generating device.

[0097] The influence of the content of inorganic hollow microspheres in the diaphragm material on the intermediate frequency Fr of the diaphragm is as follows:

[0098] like Figure 5 As shown, the density is selected as 0.5g / cm 3 , 0.8g / cm 3 , 1g / cm 3 , 1.2g / cm 3 The modified silicone polymer film layer is made into a diaphragm and applied to a sound-generating device. By testing the intermediate frequency Fr of the sound-generating device with diaphragms of different densities, it is found that as the density of the diaphragm increases, the intermediate frequency performance of the sound-generating device gradually decreases. In other words, by adding inorganic hollow microbeads to silicone rubber to form a modified silicone polymer film layer, the density of the diaphragm can be reduced and the intermediate frequency performance of the sound-generating device can be improved. The inorganic hollow microbeads here are hollow glass microbeads. It should be noted that hollow glass microbeads are a type of inorganic hollow microbeads. The use of hollow glass microbeads or other inorganic hollow microbeads can also reflect the role of inorganic hollow microbeads in the material.

[0099] According to one embodiment of the present application, the additives include a crosslinking agent and a reinforcing agent. The crosslinking agent is at least one of peroxide and hydrogenated silicone oil, and the reinforcing agent is at least one of carbon black, silica, calcium carbonate, barium sulfate, organic montmorillonite, unsaturated carboxylic acid metal salt, talc, clay, mica powder, feldspar powder, sulfates, magnetic powder, and diatomaceous earth.

[0100] In some specific embodiments of the present application, the content of the cross-linking agent accounts for 0.5 wt % to 5.2 wt % of the rubber mix, and the content of the reinforcing agent accounts for 3 wt % to 69 wt % of the rubber mix.

[0101] The crosslinking agent content accounts for 0.5wt% to 5.2wt% of the rubber mix, preferably 1wt% to 3wt%. The amount of crosslinking agent used directly determines the degree of crosslinking. When the crosslinking agent content in the system is less than 0.5wt%, the rubber has a low degree of crosslinking, low mechanical strength, and the mechanical properties of the material cannot meet product requirements. When the crosslinking agent content exceeds 5.2wt%, the rubber has a high degree of crosslinking, low elongation at break, insufficient toughness, and is prone to brittle fracture during long-term use.

[0102] Reinforcers account for 3% to 69% of the rubber mix. Reinforcers interact with rubber molecular chains through entanglement, van der Waals forces, or hydrogen bonds, forming an interface. When the material is subjected to stress, the molecular chains easily slide on the reinforcing agent surface but are difficult to separate from the reinforcing agent. The rubber molecules and the reinforcing agent form a strong bond that allows for sliding, increasing the mechanical strength. However, excessive reinforcing agents significantly increase the tensile strength of the material and sharply reduce the elongation at break, failing to meet product requirements.

[0103] According to one embodiment of the present application, the diaphragm is a single-layer structure, and the diaphragm is composed of a modified silicone polymer film layer.

[0104] In some specific embodiments of the present application, the diaphragm is a composite layer structure, and the diaphragm further includes a membrane layer made of at least one of a thermoplastic elastomer, an engineering plastic, and a thermosetting elastomer.

[0105] That is, when the diaphragm is a composite diaphragm, it includes at least one modified siloxane polymer film layer. It may include a single modified siloxane polymer film layer or multiple modified siloxane polymer film layers. The multiple modified siloxane polymer film layers may be arranged adjacent to each other or spaced apart. The specific arrangement method can be selected based on the specific design requirements of the sound-generating device.

[0106] Among them, the thermoplastic elastomer is at least one of thermoplastic polyester elastomer, thermoplastic polyurethane elastomer, thermoplastic polyamide elastomer and silicone elastomer, the engineering plastic is at least one of polyetheretherketone, polyarylate, polyetherimide, polyimide, polyphenylene sulfide, polyethylene naphthalate, polyethylene terephthalate and polybutylene terephthalate; the thermosetting elastomer is at least one of natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR), chloroprene rubber (CR), butyl rubber (IIR), nitrile rubber (NBR), chlorinated nitrile rubber (HNBR), ethylene-propylene rubber (EPDM), silicone rubber (Q), fluorosilicone rubber, fluororubber (FPM), polyurethane rubber (AU), acrylate rubber (ACM), ethylene-acrylate rubber (HNBR), ethylene-vinyl acetate rubber (EVM), chlorosulfonated polyethylene rubber (CSM), epichlorohydrin rubber (CO) and polysulfide rubber.

[0107] Furthermore, when the diaphragm is a composite diaphragm, the composite diaphragm may be composed of a film layer made of at least one of a thermoplastic polyester elastomer, a thermoplastic polyurethane elastomer, a thermoplastic polyamide elastomer, and a silicone elastomer, and a modified siloxane polymer film layer. The raw materials for the plastic polyurethane elastomer, thermoplastic polyamide elastomer, and silicone elastomer can be selected from a variety of sources and can be selected based on specific needs. The composite diaphragm composed of a film layer made of a plastic polyurethane elastomer, a thermoplastic polyamide elastomer, and a silicone elastomer and a modified siloxane polymer film layer has excellent mechanical properties, ensuring a certain level of mechanical strength while also having a high damping value.

[0108] In summary, the diaphragm of the sound-generating device according to the embodiment of the present application, which is prepared using a modified siloxane polymer film layer as a raw material, has excellent damping performance and resilience. The vibration system can effectively suppress polarization during the vibration and sound generation process, and the consistency of the vibration system is improved, effectively reducing the distortion of the sound-generating device. Moreover, by controlling the amount of inorganic hollow microspheres added, the density of the diaphragm is reduced, and the intermediate frequency Fr of the sound-generating device is improved. The diaphragm has excellent aging resistance and creep resistance, thereby improving the service life and performance of the diaphragm. Therefore, the sound-generating device made of the diaphragm of the present application has good acoustic stability and a high frequency response.

[0109] It should be noted that the diaphragm provided herein can be incorporated into any sound-generating device, such as the following typical sound-generating device: It includes a vibration system and a magnetic circuit system that cooperates with the vibration system. The vibration system includes a diaphragm and a voice coil coupled to one side of the diaphragm. When the sound-generating device is in operation, the voice coil is energized and, under the influence of the magnetic field of the magnetic circuit system, vibrates up and down, driving the diaphragm to vibrate. This vibration of the diaphragm produces sound.

[0110] According to an embodiment of the second aspect of the present application, a sound-producing device includes a vibration system and a magnetic circuit system coordinated with the vibration system. The vibration system includes a diaphragm and a voice coil coupled to one side of the diaphragm. The magnetic circuit system drives the voice coil to vibrate, thereby driving the diaphragm to produce sound. The diaphragm is the diaphragm of the aforementioned embodiment. Specifically, when the sound-producing device is in operation, after power is applied to the voice coil, the magnetic force of the magnetic circuit system causes the voice coil to vibrate up and down, driving the diaphragm to vibrate. The vibration of the diaphragm produces sound.

[0111] like Figure 7 and Figure 8 As shown, the sound-generating device includes a diaphragm 15 prepared according to the above-described embodiments of the present application. The diaphragm 15 can be composed of a surround 151 and a dome 152. The modified silicone polymer film layer can be applied to the surround of the diaphragm. Those skilled in the art can make corresponding adjustments based on actual product requirements, such as increasing the surround 151 toward the voice coil 11, positioning the dome 152 on the lower surface of the surround 151, and adding a centering support to the vibration system.

[0112] like Figure 9 and Figure 10 As shown, the sound-producing device 100 according to the third embodiment of the present application includes a shell 10 and a magnetic circuit system 14 and a vibration system arranged in the shell 10. The vibration system includes a voice coil 11, a first diaphragm 12 and a second diaphragm 13. The top of the voice coil 11 is connected to the first diaphragm 12. The magnetic circuit system 14 drives the voice coil 11 to vibrate to drive the first diaphragm 12 to produce sound. The two ends of the second diaphragm 13 are respectively connected to the bottom of the shell 10 and the voice coil 11. The second diaphragm 13 is the diaphragm of the above embodiment.

[0113] That is, the sound-generating device 100 according to the embodiment of the present application may further include two diaphragms prepared according to the above-described embodiment of the present application, namely, a first diaphragm 12 and a second diaphragm 13. The first diaphragm 12 can be used to vibrate and produce sound, and the second diaphragm 13 can be used to balance the vibration of the voice coil 11. Specifically, when the sound-generating device 100 is in operation, after the voice coil 11 is energized, the magnetic field force of the magnetic circuit system 14 causes the voice coil 11 to vibrate up and down, thereby driving the first diaphragm 12 to vibrate. The vibration of the first diaphragm 12 can produce sound. The second diaphragm 13 can also vibrate up and down following the voice coil 11. Since the two ends of the second diaphragm 13 are respectively connected to the housing 10 and the bottom of the voice coil 11, the second diaphragm 13 can balance the vibration of the voice coil 11, prevent polarization of the voice coil 11, and thus improve the sound quality of the sound-generating device 100.

[0114] It should be noted that the first diaphragm 12 and the second diaphragm 13 may simultaneously adopt the diaphragms of the above embodiment of the present application, or one of the first diaphragm 12 and the second diaphragm 13 may adopt the diaphragm of the above embodiment of the present application. The present application does not impose any specific restrictions on this.

[0115] The diaphragm of the sound-generating device of the present application is described in detail below with reference to specific embodiments.

[0116] Example 1

[0117] The formula, calculated by mass, is as follows: 100 parts polydimethylvinylsiloxane; 30 parts white carbon black; 0.6 parts siloxane coupling agent; 1 part vulcanizing agent; 0.2 parts platinum catalyst; and 20 parts hollow glass microspheres. After mixing, a cross-linking reaction is performed to form the diaphragm material. The inorganic hollow microspheres used here are hollow glass microspheres. It should be noted that hollow glass microspheres are a type of inorganic hollow microsphere. Using either hollow glass microspheres or other inorganic hollow microspheres can equally demonstrate the role played by the inorganic hollow microspheres in the material.

[0118] Test index: loss factor

[0119] The loss factors of the diaphragm material of Example 1 and conventional silicone rubber diaphragm material were tested respectively, and the loss factor (Tanδ) curves of the diaphragm material of Example 1 and conventional silicone rubber diaphragm material (rubber diaphragm without hollow glass microspheres) as a function of temperature were obtained. Figure 2 As shown, the room temperature loss factor of the diaphragm material of Example 1 can reach 0.19.

[0120] Example 2

[0121] The formula, calculated by mass, is as follows: 100 parts polydimethylvinylsiloxane; 20 parts white carbon black; 0.4 parts siloxane coupling agent; 1 part vulcanizing agent; 0.2 parts platinum catalyst; and 15 parts hollow glass microspheres. After mixing, a cross-linking reaction is performed to form the diaphragm material.

[0122] Test index: tensile strength

[0123] The tensile strength of the diaphragm material of Example 2 was tested. Figure 6 As shown, the tensile strength of the diaphragm material of Example 2 can reach 10.34Mpa, while the tensile strength of conventional silicone rubber diaphragm materials (rubber diaphragms without inorganic hollow microbeads) is usually between 7Mpa and 9Mpa. In other words, the addition of inorganic hollow microbeads can increase the tensile strength of the modified siloxane polymer film layer to a certain extent, that is, the diaphragm with the addition of inorganic hollow microbeads has excellent damping performance and resilience, and the vibration system can effectively suppress the polarization phenomenon during the vibration and sound generation process. The consistency of the vibration system is better, and the distortion of the sound-generating device is effectively reduced. The diaphragm of the present application has suitable mechanical properties, and the diaphragm is not prone to reliability problems such as film breakage when used in a sound-generating device.

[0124] Furthermore, due to the addition of inorganic hollow microspheres to the silicone rubber, the hydroxyl groups on the surface of the inorganic hollow microspheres can form hydrogen bonds with the Si-O groups in the silicone polymer molecular chains. Furthermore, the inorganic hollow microspheres can form an effective entanglement structure with the rubber molecular chains, thereby reducing slip between the silicone rubber molecules. This improves the deformation resistance of the modified silicone polymer film layer and effectively reduces the creep value of the modified silicone polymer film layer. Therefore, the rubber film layer in this embodiment also has excellent creep resistance compared to the rubber film layer without the addition of inorganic hollow microspheres.

[0125] Although some specific embodiments of the present application have been described in detail by way of examples, 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 present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A diaphragm of a sound-generating device, characterized in that: The diaphragm comprises at least one modified siloxane polymer film layer, which is prepared by mixing inorganic hollow microspheres, additives and siloxane polymer to form a mixed rubber and then subjecting it to a cross-linking reaction; The particle size of the inorganic hollow microspheres is 1 μm to 60 μm, and the distribution density of the inorganic hollow microspheres in the modified siloxane polymer film layer is 0.15 g / cm 3 ~0.9g / cm 3 The content of the inorganic hollow microspheres accounts for 5wt% to 47wt% of the total amount of the mixed rubber, and the maximum creep value of the modified silicone polymer film layer under the conditions of 23°C, a tensile stress of 0.1 MPa, and a stretching time of 10 min is ≤16%.

2. The diaphragm of the sound-generating device according to claim 1, wherein: The glass transition temperature of the modified siloxane polymer film layer is ≤-50°C.

3. The diaphragm of the sound-generating device according to claim 1, characterized in that The compressive strength of the inorganic hollow microspheres is ≥10 MPa.

4. The diaphragm of the sound-generating device according to claim 1, wherein: The density of the modified siloxane polymer film layer is 0.5 g / cm 3 ~1.1g / cm 3 .

5. The diaphragm of the sound-generating device according to claim 1, wherein: The room temperature storage modulus of the modified siloxane polymer film layer is 0.5 MPa to 35 MPa.

6. The diaphragm of the sound-generating device according to claim 1, characterized in that The modified siloxane polymer film layer has a loss factor greater than 0.08 at room temperature.

7. The diaphragm of the sound-generating device according to claim 1, characterized in that The additives include cross-linking agents and reinforcing agents, The cross-linking agent is at least one of peroxide and hydrogen-containing silicone oil; the reinforcing agent is at least one of carbon black, silicon dioxide, calcium carbonate, barium sulfate, organic montmorillonite, unsaturated carboxylic acid metal salt, talc, clay, mica powder, feldspar powder, sulfates, magnetic powder and diatomaceous earth.

8. The diaphragm of the sound-generating device according to claim 7, characterized in that: The content of the cross-linking agent accounts for 0.5wt% to 5.2wt% of the rubber mix, and the content of the reinforcing agent accounts for 3wt% to 69wt% of the rubber mix.

9. The diaphragm of the sound-generating device according to claim 1, characterized in that: The diaphragm is a single-layer structure, and the diaphragm is composed of a layer of the modified siloxane polymer film.

10. The diaphragm of the sound-generating device according to claim 1, wherein: The diaphragm is a composite layer structure, and the diaphragm further comprises a membrane layer made of one or more of thermoplastic elastomer, engineering plastic and thermosetting elastomer.

11. A sound-generating device, characterized in that: It includes a vibration system and a magnetic circuit system coordinated with the vibration system, the vibration system includes a diaphragm and a voice coil coupled to one side of the diaphragm, the magnetic circuit system drives the voice coil to vibrate to drive the diaphragm to make sound, and the diaphragm is the diaphragm described in any one of claims 1-10.

12. A sound-generating device, characterized in that: It includes a shell and a magnetic circuit system and a vibration system arranged in the shell, the vibration system includes a voice coil, a first diaphragm and a second diaphragm, the top of the voice coil is connected to the first diaphragm, the magnetic circuit system drives the voice coil to vibrate to drive the first diaphragm to make sound, the two ends of the second diaphragm are respectively connected to the shell and the bottom of the voice coil, and the second diaphragm is the diaphragm according to any one of claims 1 to 10.

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