WO2023016132A1

WO2023016132A1 - Diaphragm of sound generation device, preparation method therefor, and sound generation device

Info

Publication number: WO2023016132A1
Application number: PCT/CN2022/103241
Authority: WO
Inventors: 王海峰; 王婷; 李春
Original assignee: 歌尔股份有限公司
Priority date: 2021-08-11
Filing date: 2022-07-01
Publication date: 2023-02-16
Also published as: CN113754905A; CN113754905B

Abstract

Disclosed in the present application are a diaphragm of a sound generation device, a preparation method therefor, and a sound generation device. The diaphragm of a sound generation device comprises at least one fluorosilicone rubber film layer. A network polymer in the fluorosilicone rubber film layer comprises a first chain segment, a second chain segment and a third chain segment, the first chain segment involving formula I, the second chain segment involving formula II, and the third chain segment involving at least one among formula III, wherein the R group is a fluorine-containing alkyl; the R₃ group is methyl, ethyl or phenyl; the R₁ group is hydrogen, methyl, ethyl or phenyl; the R₂ group is methyl, ethyl or phenyl; the R₄ group is methyl or phenyl; and the R₅ group involves formula IV. The using of the network polymer, having the first chain segment, the second chain segment and the third chain segment, as a raw material in the diaphragm of the present application not only makes the diaphragm have good chemical resistance, but can also adjust the physical and chemical properties of the fluorosilicone rubber by adjusting the ratio of Si to the fluorine-containing alkyl of R in the network polymer, thereby realizing adjustment of a loudspeaker Qms.

Description

Diaphragm of sounding device, preparation method thereof, and sounding device

technical field

The present application relates to the technical field of electroacoustics, and more specifically, relates to a diaphragm of a sounding device, a preparation method thereof, and a sounding device using the diaphragm.

Background technique

At present, high temperature-resistant engineering plastic composite films or silicone rubber are generally used as diaphragm materials in loudspeakers. However, engineering plastic composite films have poor low-temperature performance, are prone to problems such as film rupture, and have the disadvantages of low reliability and high risk of failure.

Methyl and vinyl silicone rubber have excellent high and low temperature resistance. Although they have good reliability, as speakers are more and more used in smart wear, speakers will often contact with skin, and human skin will produce Sweat (the main component is oil), and methyl and vinyl silicone rubber are not good at sweating, which will reduce the use effect and service life of the speaker. Moreover, due to the regular molecular chain structure of methyl and vinyl silicone rubber, the damping is small, so the adjustment space of the quality factor (Qms) of the diaphragm is small.

It can be seen that the existing engineering plastic composite films are prone to problems of film folding and film rupture; while silicone rubber has low damping, and the Qms value can be adjusted in a small space. At the same time, performance such as sweat resistance needs to be improved.

Therefore, a new technical solution is needed to solve the above problems.

Contents of the invention

An object of the present invention is to provide a vibrating membrane of a sound generating device.

Another object of the present invention is to provide a method for preparing the above diaphragm.

Another object of the present invention is to provide a sound generating device composed of the above diaphragm.

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

According to the vibrating membrane of the sound generating device in the first aspect of the present invention, the vibrating membrane includes at least one layer of fluorosilicone rubber film layer, and the network polymer in the fluorosilicone rubber film layer includes a first chain segment, a second chain segment and the third chain segment, the first chain segment is

The second segment is

The third segment is

At least one of them; wherein, the R group is a fluorine-containing alkyl group, the _R3 group is methyl, ethyl or phenyl, the _R1 group is hydrogen, methyl, ethyl or phenyl, and the _R2 group The group is methyl, ethyl or phenyl, the R ₄ group is methyl or phenyl, and the R ₅ group is

According to some embodiments of the present invention, the molar ratio of the R groups to Si atoms in the network polymer is (1˜100):100.

According to the manufacturing method of the diaphragm of the sound generating device according to the embodiment of the second aspect of the present invention, the manufacturing method includes: using a siloxane polymer including a fluorine-containing alkyl side chain as the base polymer, in the base polymer Adding fillers, structure control agents and other additives to form the fluorosilicone rubber film layer of the vibrating film through mixing;

Wherein, the siloxane polymer is a linear random polymer with a main chain composed of segment 1, segment 2 and segment 3 and terminated by a side chain group, and the segment 1 is:

The second segment is:

The third segment is:

The R group in the segment one is a fluorine-containing alkyl group, the R group is methyl, ethyl or phenyl, and the _R group in the segment two is a hydrogen group, a _methyl group, an ethyl group Or phenyl, the _R2 group is methyl, ethyl or phenyl, and the _R4 group in the segment three is methyl or phenyl.

According to some embodiments of the present invention, the molar ratio of the R groups to Si atoms in the base polymer is (1˜100):100.

According to some embodiments of the present invention, the R group is trifluoropropyl or trifluorobutyl.

According to some embodiments of the present invention, the other auxiliary agent is a cross-linking agent, the cross-linking agent is a peroxide, and the molecular structure formula of the cross-linking agent is R ₅ -OOR ₅ , wherein the R ₅ group is

According to some embodiments of the present invention, the other additives are catalysts and inhibitors, wherein the catalysts are compounds or complexes containing platinum, and the inhibitors are acetylenic alcohol compounds.

According to some embodiments of the present invention, the filler is silica, surface-modified silica, mica, graphene, clay, calcium carbonate, carbon nanotubes, kaolin, ferric oxide, SnO ₂ , CeO ₂ and One or several kinds of talcum powder.

According to some embodiments of the present invention, the structure control agent is dihydric alcohol, diorganocyclosilyl ether, diorganosilicon diol, alkoxysilane, hydroxyl fluorine-containing silicone oil, silicone containing Si-N bond compound and at least one of an organosilicon compound containing a Si-O-B bond.

According to some embodiments of the present invention, the hardness of the fluorosilicone rubber film layer is 20A-95A.

According to some embodiments of the present invention, the tensile strength of the fluorosilicone rubber film layer is 1 MPa˜15 MPa.

According to some embodiments of the present invention, the thickness of the fluorosilicone rubber film layer is 30 μm˜250 μm.

According to some embodiments of the present invention, the loss factor of the fluorosilicone rubber film layer is ≥0.1.

According to some embodiments of the present invention, fillers, structure control agents, and other additives are added to the base polymer to form a fluorosilicon compound after mixing, and the method for making the diaphragm further includes: adding the fluorosilicon compound The rubber mixing adopts compression molding, injection molding or pneumatic molding to form the fluorosilicone rubber film layer.

The sound generating device according to the embodiment of the third aspect of the present invention includes a vibration system and a magnetic circuit system matched with the vibration system, the vibration system includes a diaphragm and a voice coil combined on one side of the diaphragm, the 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 invention.

According to the fourth aspect of the present invention, the sound generating device includes a housing, a magnetic circuit system and a vibration system disposed in the housing, the vibration system includes a voice coil, a first diaphragm and a second diaphragm, the 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, and the two ends of the second diaphragm are respectively connected to the housing and The bottom of the voice coil is connected, and the second diaphragm is the diaphragm according to the above-mentioned embodiment of the present invention.

According to the diaphragm of the sound generating device of the embodiment of the present invention, the network polymer having the first chain segment, the second chain segment and the third chain segment is used as the raw material, so that the diaphragm has good resilience and good hydrophobicity. Oil-resistant properties can keep the acoustic performance of the diaphragm stable, and the problems of film folding and cracking are not easy to occur, reducing the failure of the diaphragm due to contact with water and oil, etc., effectively improving the use effect and service life of the speaker . In addition, the physical and chemical properties of fluorosilicone rubber, such as chemical resistance (such as sweat, etc.), and damping performance, can be further adjusted by adjusting the ratio of Si and fluorine-containing alkyl R in the network polymer, so as to achieve the Qms of the speaker. adjust.

Other features of the present application and advantages thereof will become apparent through the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings.

Description of drawings

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

1 is a schematic structural diagram of a sounding device according to an embodiment of the present invention;

Fig. 2 is an infrared spectrogram of a diaphragm of a sound generating device according to an embodiment of the present invention and a diaphragm of a comparative example.

reference sign

Speaker vibration unit 100;

Diaphragm 10; Surround 11; Ball top 12;

Voice coil 20.

Detailed ways

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that 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 unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

The diaphragm of the sound generating device according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The diaphragm of the sound generating device according to the embodiment of the present invention includes at least one layer of fluorosilicone rubber film layer, and the network polymer in the fluorosilicone rubber film layer includes a first segment, a second segment and a third segment, the first segment A segment is

The second segment is

The third segment is

The diaphragm of the sound generating device according to the embodiment of the present invention is composed of at least one fluorosilicone rubber film layer. Specifically, the diaphragm in the present application can be formed into a single-layer structure, or can be formed into a multi-layer composite structure. When the diaphragm has a single-layer structure, that is, the diaphragm is made of one layer of the fluorosilicone rubber film of the present application. When the diaphragm has a multi-layer composite structure, the diaphragm includes at least one layer of fluorosilicone rubber film, and the film layer of fluorosilicone rubber in the diaphragm is composited with film layers of other materials. Optionally, when the diaphragm contains multiple layers of fluorosilicone rubber film layers, two adjacent layers of fluorosilicone rubber film layers can be arranged at intervals, that is, two adjacent layers of fluorosilicone rubber film layers can also be arranged The film layers of other materials, of course, can also be arranged in close contact with two adjacent fluorosilicone rubber film layers, and can be selected and set according to actual use requirements, which is not specifically limited in this application.

Wherein, the fluorosilicone rubber film layer is made of fluorosilicone rubber containing a network polymer, and the network polymer is polymerized by at least a first chain segment, a second chain segment and a third chain segment. The third segment may include the above-mentioned multiple options, therefore, the network polymer finally polymerized by the first segment, the second segment and the third segment may also include various combinations. For example, the network polymer can be at least a combination of the following segments:

combination one

combination two

combination three

combination of four

Combination five

combination six

Combination seven

It should be noted that the above multiple combinations are only schematic illustrations of the first segment, the second segment and the third segment in the network polymer, and do not limit that the network polymer can only be composed of the above seven types Examples are assembled. Fluorosilicone rubber made of the network polymer according to the above-mentioned embodiments of the present application has excellent oil resistance and solvent resistance. For aliphatic, aromatic and chlorinated hydrocarbon solvents, for various petroleum-based fuel oils and lubricating oils , hydraulic oil and some synthetic oils (such as diester lubricating oil, silicate hydraulic oil, etc.) have good stability at room temperature and high temperature, and can maintain elasticity. Under the condition of oil immersion, the maximum service temperature can reach 180℃. It has good stability at room temperature and high temperature, and can be used for a long time in the range of -50°C to 200°C, and for short-term use at 250°C.

In addition, since the first chain segment has a fluorine-containing alkyl R, the third chain segment can be a segment with a fluorine-containing alkyl R, or a segment without a fluorine-containing alkyl R, therefore, it can be adjusted by The number of each chain segment is used to adjust the molar ratio of fluorine-containing alkyl R and Si in the network polymer.

Specifically, the R groups of the first segment and the third segment are fluorine-containing alkyl groups, and the ratio of Si and fluorine-containing alkyl in the network polymer can be adjusted by adjusting the ratio of the first segment in the network polymer. The ratio of the group R; by adjusting the ratio of the third segment in the network polymer, the ratio of Si and fluorine-containing alkyl R in the network polymer can be further adjusted.

Since polymers with different properties can be obtained by adjusting the ratio of fluorine-containing alkyl side chains to silicon atoms, each polymer will have corresponding physical and chemical properties (damping, toughness, strength, hydrophobicity, oleophobicity, etc.), and these properties affect The Qms of the speaker, so by adjusting the ratio of fluoroalkyl side chains to silicon atoms, the Qms of the speaker can be tuned. Speakers with different Qms will have different frequency responses. For example, the lower the damping of the diaphragm and the higher the Qms, the better the transient frontier of the speaker, and the more timely the response to the signal, but the poorer the trailing edge, the longer the tail will sound and the sound will be muddy.

It should be noted that Qms is the mechanical quality factor of the speaker unit, indicating the non-resistive part, that is, the mechanical loss, which is mainly affected by the diaphragm vibration system. The higher the Qms, the lower the damping of the diaphragm.

Therefore, according to the diaphragm of the sound generating device of the embodiment of the present invention, by using the network polymer having the first chain segment, the second chain segment and the third chain segment as the raw material, the diaphragm can have good resilience and Good hydrophobic and oil-resistant properties can keep the acoustic performance of the diaphragm stable, and the problems of film folding and cracking are not easy to occur, reducing the failure of the diaphragm due to contact with water and oil, etc., and can improve the use effect of the speaker and service life. In addition, the physical and chemical properties of fluorosilicone rubber, such as chemical resistance (such as sweat, etc.), and damping performance, can be further adjusted by adjusting the ratio of Si and fluorine-containing alkyl R in the network polymer, so as to achieve the Qms of the speaker. adjust.

According to an embodiment of the present application, the molar ratio of R groups to Si atoms in the network polymer is (1˜100):100.

That is to say, the molar ratio of the R group in the network polymer to the Si atom can be 1:100, 50:100, 65:100 or 100:100, that is, the R group in the network polymer to the Si atom The molar ratio can be any other ratio between 1:100 and 100:100. And by adjusting the number ratio between the first chain segment, the second chain segment and the third chain segment in the network polymer, the molar ratio of the R group and the Si atom in the network polymer can be made between 1:100 and It can be adjusted between 100:100.

By adjusting the ratio of Si and fluorine-containing alkyl R in the main chain of the siloxane polymer, the physical and chemical properties of fluorosilicone rubber, such as chemical resistance (such as sweat, etc.), and damping performance, can be adjusted to achieve the Qms of the speaker Adjustment, therefore, the adjustable space of the ratio of the fluorine-containing alkyl group and Si in the network polymer according to the embodiment of the present application is large, and the ratio of Si in the network polymer main chain and the fluorine-containing alkyl group R is carried out. With multiple adjustments, fluorosilicone rubber with different physical and chemical properties can be obtained, which not only further adjusts the physical and chemical properties of the fluorine diaphragm, but also increases the adjustment space for the Qms value of the speaker, providing more possibilities for acoustic design.

The present application also provides a method for making a diaphragm of a sounding device. The method includes using a siloxane polymer containing a fluoroalkyl side chain as the base polymer, adding fillers, a structure control agent and Other additives are mixed and formed to form the fluorosilicone rubber film layer of the diaphragm.

Among them, the siloxane polymer is a straight-chain random polymer with a main chain composed of a segment one, a second segment and a segment three, and terminated by a side chain group, and the segment one is:

Segment two is:

Segment three is:

The R group in segment one is a fluorine-containing alkyl group, the R group is methyl, ethyl or phenyl, and the _R group in segment two is hydrogen, methyl, ethyl _or phenyl, The R ₂ group is methyl, ethyl or phenyl, and the R ₄ group in segment 3 is methyl or phenyl.

In other words, the manufacturing method of the diaphragm of the sound generating device according to the embodiment of the present invention can be used to prepare the diaphragm involved in the above embodiments. The diaphragm of the sound generating device according to the embodiment of the present invention is composed of at least one fluorosilicone rubber film layer, therefore, the manufacturing method of the diaphragm of the sound generating device according to the embodiment of the present invention is mainly the preparation method of the fluorosilicone rubber film layer.

The preparation method of the fluorosilicone rubber film layer according to the embodiment of the present invention can specifically be: use polysiloxane containing fluoroalkyl side chains as the base polymer, and add fillers, structure control agents and crosslinking agents to the base polymer. Agents, etc. are mixed and molded at a temperature of 80°C to 200°C to obtain a fluorosilicone rubber film layer. Then, conventional processing is performed on the fluorosilicone rubber film layer to obtain the diaphragm of the above-mentioned embodiment of the present invention.

Wherein, the main chain of the base polymer may be mainly composed of segment one, segment two and segment three, and may be terminated by a methyl group, a hydroxyl group or a vinyl group. The siloxane polymer is a random copolymer including segment one, segment two and segment three, and the base polymer is vulcanized to form a network polymer. By adjusting the number of first segments in the base polymer, the molar ratio of R groups to Si atoms in the network polymer can be adjusted.

Specifically, the molecular weight of the siloxane polymer can be adjusted according to the performance requirements of the diaphragm, and the number of segment one, segment two and segment three in the siloxane polymer can be adjusted through random polymerization In the obtained siloxane polymer, there is no specific order and regularity in the arrangement of segment 1, segment 2 and segment 3. Those skilled in the art know that, compared with block-polymerized siloxane polymers, the structures of random-polymerized siloxane polymers have more possibilities. There are also more combinations of the number of segments two and three.

In addition, because of the vinyl group on the third segment, it is beneficial to make the base polymer form a network polymer to ensure the required strength of the diaphragm.

Further, since segment 2 has a fluorine-containing alkyl group R, and the siloxane polymer main chain has Si, compared with block polymers, the Si in the random siloxane polymer main chain has the fluorine-containing alkyl R The molar ratio has a larger adjustable range, that is, the adjustable space for the molar ratio of Si in the main chain of the random siloxane polymer to the fluorine-containing alkyl R is larger.

Compared with the prior art, the diaphragm prepared by the preparation method of the present application has good damping performance, so that the Qms of the loudspeaker using the diaphragm has a larger adjustable range, providing more acoustic design. possibility. At the same time, due to the presence of fluorine-containing alkyl side chains, the diaphragm material is excellent in chemical resistance (such as sweat, perfume, etc.), which effectively improves the use effect and service life of the speaker.

Therefore, according to the preparation method of the vibrating membrane according to the embodiment of the present invention, by using a siloxane polymer including segment one, segment two and segment three randomly polymerized as the base polymer of the fluorosilicone rubber film layer, so that The ratio of Si in the main chain of the siloxane polymer to the fluoroalkyl group R can be adjusted in a larger range, and by adjusting the ratio of Si in the main chain of the siloxane polymer to the fluoroalkyl R, the fluorosilicone rubber can be adjusted. The physical and chemical properties of the diaphragm can be obtained with different performance requirements, so that the Qms value of the speaker using the diaphragm has a large adjustment space, providing more possibilities for acoustic design.

According to an embodiment of the present application, the molar ratio of R groups to Si atoms in the base polymer is (1˜100):100.

Specifically, the content of segment 1, segment 2 and segment 3 in the base polymer can be controlled so that the molar ratio of R groups to Si atoms in the network polymer (1-100):100. Optionally, the molar ratio of the R group in the network polymer to the Si atom can be 1:100, 50:100, 65:100 or 100:100, etc., that is, the R group in the network polymer and the Si atom The molar ratio of atoms can be any other ratio between 1:100 and 100:100.

According to one embodiment of the present application, the R group is trifluoropropyl or trifluorobutyl.

That is to say, the R group in segment 2 is a fluorine-containing alkyl group, specifically trifluoromethyl, trifluoroethyl, trifluoropropyl, or trifluorobutyl. Among them, since the trifluoropropyl group is at the γ position, it has more excellent heat resistance and can ensure the acoustic performance of the speaker, so it is preferable that the R group is trifluoropropyl group.

In some specific embodiments of the present application, the other auxiliary agent is a cross-linking agent, the cross-linking agent is a peroxide, the molecular structure formula of the cross-linking agent is R ₅ -OOR ₅ , and the R ₅ group is

Specifically, the crosslinking agent can be 2,4-dichlorobenzoyl peroxide, benzoyl peroxide, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane, di-tert-butyl At least one of base peroxide and dicumyl peroxide.

Among them, the cross-linking agent is a substance that can act as a bridge between linear molecules, so that multiple linear molecules are bonded and cross-linked to form a network structure. The cross-linking agent involved in this application can be referred to as "vulcanizing agent", which is added to the base polymer, and the linear random polymer can undergo a cross-linking reaction, that is, after the base polymer is vulcanized, it can produce a network polymer. The network polymer can increase the properties of rubber such as elasticity, hardness, tensile strength and elongation strength. The above-mentioned crosslinking agent can achieve the required properties of the diaphragm, such as elasticity, strength, tensile strength and elongation strength.

According to an embodiment of the present application, other auxiliary agents are catalysts and inhibitors, wherein the catalysts are compounds or complexes containing platinum, and the inhibitors are acetylenic alcohol compounds.

That is to say, fillers, structure control agents, catalysts and inhibitors can be added to the base polymer with segment 1, segment 2 and segment 3 to form the fluorosilicone rubber film layer of the diaphragm through kneading. Among them, the catalyst may be a compound or complex containing platinum. This type of catalyst has high activity, high stability in use, good yellowing resistance, and can effectively promote the reaction and accelerate the vulcanization of the base polymer. Inhibitors can be acetylenic alcohol compounds, and acetylenic alcohol inhibitors are a class of inhibitors containing alkynyl groups, polar group hydroxyl groups, and non-polar group hydrocarbon groups. This structure determines that it has many excellent properties, such as high surface activity. , Good dispersibility, low toxicity, excellent low foaming and defoaming properties, etc. The inhibitor can work together with the catalyst, so that the base polymer can be polymerized into a network polymer and achieve the required strength of the diaphragm, while preventing excessive polymerization and delaying the aging of fluorosilicone rubber.

According to one embodiment of the present application, the filler is silica, surface-modified silica, mica, graphene, clay, calcium carbonate, carbon nanotubes, kaolin, ferric oxide, SnO ₂ , CeO ₂ and talcum powder one or more of them.

Among them, silicon dioxide and carbon black are reinforcing agents, which can improve the mechanical properties of the diaphragm material, and metal oxides can improve the heat resistance stability of the diaphragm material.

In some specific embodiments of the present application, the structure control agent is dihydric alcohol, diorganocyclosilyl ether, diorganosilicon diol, alkoxysilane, hydroxyl fluorine-containing silicone oil, silicone containing Si-N bond compound and at least one of an organosilicon compound containing a Si-O-B bond. The structure control agent of the present application can effectively control the structure of the fluorosilicone rubber, further ensuring that the fluorosilicone rubber has good physical and chemical properties.

According to an embodiment of the present application, the hardness of the fluorosilicone rubber film layer is 20A-95A.

That is to say, the hardness of the fluorosilicone rubber film layer can be selected during the preparation process according to the performance requirements of the diaphragm, and the ratio of the number of the first segment, the second segment and the third segment can be adjusted. Or change its hardness by adding additives, so that the hardness of the fluorosilicone rubber film layer can be arbitrarily selected within the range of 20A-95A, such as 20A, 30A, 45A, 50A, 70A, 85A or 95A. Preferably, the hardness of the fluorosilicone rubber film layer can be 30A-50A, which can better meet the rigidity and elasticity required by the diaphragm and ensure the use effect of the speaker.

In some specific embodiments of the present application, the tensile strength of the fluorosilicone rubber film layer is 1 MPa˜15 MPa.

That is to say, the tensile strength of the fluorosilicone rubber film layer of the diaphragm of this application can be selected within 1MPa～15MPa, and can be adjusted according to the requirements of the diaphragm, such as 1MPa, 3MPa, 5MPa, 7MPa, 10MPa, 15MPa . Preferably, the tensile strength of the fluorosilicone rubber film layer can be 7Mpa to 10Mpa. This range can make the diaphragm have a certain degree of elasticity and at the same time ensure a certain degree of rigidity. service life.

According to an embodiment of the present application, the thickness of the fluorosilicone rubber film layer is 30 μm˜250 μm.

The thickness of the fluorosilicone rubber film layer of the present invention can be arbitrarily selected within the range of 30 μm to 250 μm, and can be adjusted according to specific needs, such as 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, 250 μm, etc. Because the strength of vulcanized rubber is lower than that of pure elastic body, in order to meet the stiffness required for diaphragm vibration, a certain thickness needs to be matched. However, if the thickness is too large, the vibration space of the diaphragm will be lost, and if the thickness of the diaphragm is too large, the weight of the diaphragm will be increased, which will reduce the sensitivity of the diaphragm. Therefore, preferably, the thickness of the fluorosilicone rubber film layer can be 60 μm～ 120μm, at this time, the thickness of the diaphragm can well take into account the stiffness, resilience and damping required for the vibration of the diaphragm.

In some specific embodiments of the present application, the loss factor of the fluorosilicone rubber film layer is ≥0.1.

The loss factor of the fluorosilicone rubber film layer in the present invention is the data obtained by using DMA temperature scanning mode, 1 Hz vibration frequency, and 3°C/min heating rate, which can further optimize the performance of the diaphragm by matching with the thickness of the diaphragm. Generally, the higher the loss factor, the better the damping property of the material. The improvement of the damping property of the diaphragm material is beneficial to reduce the polarization during the vibration process, reduce product distortion, and improve the listening yield. For example, the loss factor may be 0.10, 0.11, 0.12, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, or 0.21.

According to an embodiment of the present application, fillers, structure control agents and other additives can also be added to the base polymer to form fluorosilicone compound rubber through mixing. Molding, injection molding or air molding to form the fluorosilicone film layer. Therefore, the preparation method adopts conventional procedures, has strong selectivity, high versatility, simple process, and is suitable for popularization and use.

In a word, according to the manufacturing method of the diaphragm of the sound generating device according to the embodiment of the present invention, the linear random polymer having the first segment, the second segment and the third segment is used as the base polymer, and the base polymer is added Additives, the fluorosilicone rubber film layer of the diaphragm can be obtained after processing and forming, which can make the diaphragm have good damping performance, ensure the use effect of the speaker using the diaphragm, and make the Qms value of the speaker have more room for adjustment. Design offers more possibilities. At the same time, due to the existence of fluorine-containing alkyl side chains, the diaphragm material has excellent performance in chemical resistance (such as sweat, perfume, etc.).

According to the embodiment of the present application, there is also provided a sound generating device, including a vibration system and a magnetic circuit system matched with the vibration system, the vibration system includes a diaphragm and a voice coil combined on one side of the diaphragm, and the magnetic circuit system drives the voice coil to vibrate To drive the vibrating membrane to produce sound, the vibrating membrane is the above-mentioned vibrating membrane.

According to an embodiment of the present application, there is also provided a sounding device, which includes a casing, a magnetic circuit system and a vibration system disposed in the casing, the vibration system includes a voice coil, a first diaphragm and a second diaphragm, and the top of the voice coil is connected to the The first diaphragm is connected, 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 with the shell and the bottom of the voice coil, and the second diaphragm is the above-mentioned diaphragm.

The vibrating membrane provided by the present invention can form a sounding device of any structure, such as the following typical sounding device: including a vibration system and a magnetic circuit system matched with the vibrating system, the vibrating system includes a vibrating membrane and a voice coil combined on one side of the vibrating membrane . When the sound generating device is working, the voice coil can vibrate up and down under the action of the magnetic field force of the magnetic circuit system after the voice coil is energized to drive the vibration of the diaphragm, and the sound can be produced when the diaphragm vibrates.

According to another embodiment of the present invention, the sound generating device may include a housing and a magnetic circuit system and a vibration system disposed in the housing. The vibration system may include a voice coil, a first diaphragm and a second diaphragm, and the top of the voice coil Connected with the first diaphragm, the magnetic circuit system drives the voice coil to vibrate to drive the first diaphragm to produce sound, and the two ends of the second diaphragm are respectively connected with the shell and the bottom of the voice coil. Wherein, the second diaphragm may be the diaphragm according to the foregoing embodiments of the present invention.

That is to say, the first diaphragm can be used to vibrate and produce sound, and the second diaphragm can be used to balance the vibration of the voice coil. Specifically, when the sound generating device is working, the voice coil can vibrate up and down under the action of the magnetic field force of the magnetic circuit system after the voice coil is energized to drive the first diaphragm to vibrate, and the first diaphragm can vibrate to produce sound. The second diaphragm can also vibrate up and down with the voice coil. Since the two ends of the second diaphragm are respectively connected to the bottom of the shell and the voice coil, the second diaphragm can balance the vibration of the voice coil and prevent the polarization of the voice coil. Therefore, the sounding effect of the sounding device can be improved.

It should be noted that the first diaphragm and the second diaphragm can use the diaphragm of the above-mentioned embodiment of the present invention at the same time, or one of the first diaphragm and the second diaphragm can adopt the diaphragm of the above-mentioned embodiment of the present invention. The diaphragm, which is not specifically limited in the present invention.

Further, those skilled in the art can make corresponding adjustments to the speaker vibration unit 100 according to actual product requirements. For example, as shown in FIG. 1 , the surround portion 11 protrudes toward the voice coil 20 , the ball top 12 is located on the lower surface of the surround portion 11 , and a damper is added to the vibration system. The sounding diaphragm 10 is made up of a ring portion 11 and a ball top 12, and the diaphragm 10 made of a polysiloxane polymer having a fluoroalkyl side chain can be located at the ring portion 11, or at the ring portion 11 and the ball. Top 12.

The diaphragm of the sound generating device of the present invention will be specifically described below in conjunction with specific embodiments.

Comparative example one

In parts by weight, 65 parts of methyl vinyl polysiloxane are used as the base polymer, 30 parts of silicon dioxide are used as reinforcing fillers, 3 parts of hydroxyl fluorosilicone oil is used as a structure control agent, and 0.1 part of chloroplatinic acid alcohol solution is Catalyst, 1.9 parts of 1-ethynyl-1-cyclohexanol and fluorine-containing silicone oil mixture as inhibitor. After vulcanization, a vibrating film material filled with silicon dioxide is formed and assembled into a product.

Embodiment one

In parts by weight, use 70 parts of basic polymer (trifluoropropyl to Si molar ratio is 1:100), 25 parts of silica reinforcing agent, 3 parts of hydroxyl fluorosilicone oil as structure control agent, 0.1 part of chlorine Platinic acid alcohol solution was used as catalyst, and 1.9 parts of 1-ethynyl-1-cyclohexanol and fluorine-containing silicone oil mixture was used as inhibitor. After vulcanization, a vibrating film material filled with silicon dioxide is formed and assembled into a product.

Embodiment two

In parts by weight, 67 parts of basic polymer (trifluoropropyl and Si molar ratio is 30:100), 30 parts of silica reinforcing agent, 0.1 part of chloroplatinic acid alcohol solution as catalyst, 2.4 parts of The mixture of 1-ethynyl-1-cyclohexanol and fluorine-containing silicone oil is an inhibitor. After vulcanization, a vibrating film material filled with silicon dioxide is formed and assembled into a product.

Embodiment three

In parts by weight, 65 parts of basic polymer (trifluoropropyl to Si molar ratio is 60:100), 31 parts of silica reinforcing agent, 1 part of hydroxyl fluorosilicone oil as structure control agent, 0.2 parts of chlorine Platinic acid alcohol solution was used as catalyst, and 2.8 parts of 1-ethynyl-1-cyclohexanol and fluorine-containing silicone oil mixture was used as inhibitor. After vulcanization, a vibrating film material filled with silicon dioxide is formed and assembled into a product.

Embodiment four

In parts by weight, 75 parts of basic polymer (trifluoropropyl to Si molar ratio is 100:100), 20 parts of silica reinforcing agent, 2 parts of hydroxyl fluorosilicone oil as structure control agent, 0.2 parts of chlorine Platinic acid alcohol solution was used as catalyst, and 2.8 parts of 1-ethynyl-1-cyclohexanol and fluorine-containing silicone oil mixture was used as inhibitor. After vulcanization, a vibrating film material filled with silicon dioxide is formed and assembled into a product.

Among them, the vibrating membranes prepared in Embodiment 1, Embodiment 2, Embodiment 3 and Embodiment 4 contain the network polymer of the following chain segments

Specifically, as shown in Table 1, Table 1 is the ratio table of each raw material in Comparative Example 1, Example 1, Example 2, Example 3 and Example 4. Comparative Example 1, Example 1, Example 2, Example 3 and Example 4 respectively add the basic polymer, filler and structure control agent into the kneader according to the corresponding formula above, heat to 100°C, vacuumize, and mix After 4h-8h of kneading, add the crosslinking agent after cooling down to room temperature, and continue kneading for 2h to obtain the desired rubber compound (fluorosilicone rubber). Samples with a thickness of about 2 mm were prepared by molding for material performance testing.

Table I

Test indicators: hardness, tensile strength, loss factor

As shown in Table 2, Table 2 shows the performance test results of the diaphragms of Comparative Example 1, Example 1, Example 2, Example 3 and Example 4. By comparing the data of Comparative Example 1, Example 1, Example 2, Example 3 and Example 4, it can be seen that under the same premise of hardness, with the increase of the molar ratio of trifluoropropyl to silicon atoms, the The tensile strength and loss factor gradually increase. That is to say, by adjusting the molar ratio of R groups to silicon atoms, the tensile strength and loss factor of the diaphragm material can be adjusted, and when the molar ratio of R groups to silicon atoms increases, the tensile strength and loss factor of the material gradually increase. becomes larger, the molar ratio of R groups to silicon atoms can be selected according to the performance requirements of the speaker.

Among them, the material testing and value standards are as follows:

Hardness: tested by GBT531.1-2008 standard;

Tensile strength: GBT528-2009 standard is used for tensile test, and the tensile rate is tested at 300mm/min;

Loss factor: Tested according to ASTM D412-2016 standard, the test vibration frequency is 1Hz, the heating rate is 3°C/min, and the value is taken at 23°C.

Table II

Test indicator: Qms value

Further, the above compounded rubber was used, placed in a compression molding equipment, and vulcanized at a molding temperature of 175° C. for 180 s to prepare a diaphragm with a thickness of about 100 μm. According to the product design, it is cut and assembled into the speaker system for product acoustic testing. The small signal (LPM) test of the product is carried out with Klippel equipment, and the corresponding TS parameters are obtained, where Qms is the mechanical quality factor, which can reflect the influence of the damping of the diaphragm on the resonance of the speaker unit.

As shown in Table 2, by comparing the data of Comparative Example 1, Example 1, Example 2, Example 3 and Example 4, it can be found that the Qms value varies greatly between different formulations, because the basic polymer of the present application is Atactic polymers can provide more molar ratios of R groups and silicon atoms to diversify their formulations to obtain different Qms.

It can be seen that the use of the material of the present invention can provide a larger selection space for the quality factor of the loudspeaker, increase the design margin of the loudspeaker, and provide more possibilities for acoustic design.

Test index: F0 change after oleic acid exposure

In addition, since the main component of sweat is oleic acid grease, in order to test the sweat resistance of the diaphragm material, you can apply oleic acid grease on the surface of the diaphragm, and test the resonant frequency F0 of the speaker after standing still for 24 hours.

As shown in Table 2, as the molar ratio of trifluoropropyl group to silicon atom increases, the change of F0 becomes smaller before and after the diaphragm contacts with oleic acid. That is to say, when the molar ratio of R groups to silicon atoms increases, the diaphragm has good chemical resistance, which can ensure the stable acoustic performance of the diaphragm and effectively reduce the impact of sweat, perfume and other liquids on the performance of the speaker.

In addition, as shown in Figure 2, Figure 2 shows the infrared spectrum of the diaphragm of the sound generating device according to Embodiment 1 of the present invention and the diaphragm of the comparative example, as can be seen from Figure 2, at a wavelength of about 1210nm Under certain conditions, the vibrating film containing trifluoropropyl group in Example 1 has a strong absorption peak, but there is no such absorption peak in the comparative example, which can verify the presence of trifluoropropyl group in the vibrating film according to the present invention.

Thus, the present application adopts the siloxane polymer comprising segment one, segment two and segment three random polymerization as the base polymer of the fluorosilicone rubber film layer, and by adjusting the siloxane polymer in the main chain of the siloxane polymer The ratio of Si to fluorine-containing alkyl group R can adjust the physical and chemical properties of fluorosilicone rubber, and can obtain diaphragms with different performance requirements, so that the Qms value of the speaker using this diaphragm has a large adjustment space, providing more flexibility for acoustic design. possibility. Moreover, the fluorosilicone rubber film layer also has good chemical resistance, which not only effectively guarantees the use effect of the speaker, but also improves the service life of the speaker.

Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, rather than limiting the scope of the present application. Those skilled in the art will appreciate that modifications can be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

A vibrating membrane of a sounding device, characterized in that the vibrating membrane comprises at least one layer of fluorosilicone rubber film layer, and the network polymer in the fluorosilicone rubber film layer comprises a first chain segment, a second chain segment and The third chain segment, the first chain segment is
The second segment is
The third segment is

at least one of;

Wherein, the R group is a fluorine-containing alkyl group, the R group is a methyl group, an ethyl group or a phenyl group, the R group is a hydrogen group, a methyl group, an ethyl group or a phenyl group, and the R group is a methyl group, Ethyl or phenyl, R 4 group is methyl or phenyl, R 5 group is
The diaphragm of the sound generating device according to claim 1, characterized in that, the molar ratio of the R group to the Si atom in the network polymer is (1-100):100.
A method for manufacturing a diaphragm of a sounding device, characterized in that the method includes:

The fluorosilicone rubber film of the vibrating film is formed by mixing the siloxane polymer containing fluoroalkyl side chains as the base polymer, adding fillers, structure control agents and other additives to the base polymer layer;

Wherein, the siloxane polymer is a linear random polymer with a main chain composed of segment 1, segment 2 and segment 3 and terminated by a side chain group, and the segment 1 is:
The second segment is:
The third segment is:

The R group in the segment one is a fluorine-containing alkyl group, the R group is methyl, ethyl or phenyl, and the R group in the segment two is a hydrogen group, a methyl group, an ethyl group Or phenyl, the R2 group is methyl, ethyl or phenyl, and the R4 group in the segment three is methyl or phenyl.
The manufacturing method of the diaphragm of the sound generating device according to claim 3, characterized in that, the molar ratio of the R group in the base polymer to the Si atom is (1-100):100.
The manufacturing method of the diaphragm of the sound generating device according to claim 3, characterized in that, the R group is trifluoropropyl or trifluorobutyl.
The manufacturing method of the diaphragm of the sound generating device according to claim 3, wherein the other auxiliary agent is a crosslinking agent, the crosslinking agent is a peroxide, and the molecular structural formula of the crosslinking agent is R 5 -OOR 5 , wherein the R 5 group is
The manufacturing method of the diaphragm of the sound generating device according to claim 3, characterized in that, the other additives are catalysts and inhibitors, wherein the catalysts are compounds or complexes containing platinum, and the inhibitors are The agent is an acetylenic alcohol compound.
The manufacturing method of the diaphragm of the sounding device according to claim 3, wherein the filler is silicon dioxide, surface-modified silicon dioxide, mica, graphene, clay, calcium carbonate, carbon nanotubes, kaolin , ferric oxide, SnO 2 , CeO 2 and talcum powder or one or more.
The manufacturing method of the diaphragm of the sound generating device according to claim 3, wherein the structure control agent is dihydric alcohol, diorganocyclosilyl ether, diorganosilanediol, alkoxysilane, hydroxyl At least one of fluorine-containing silicone oil, an organosilicon compound containing a Si-N bond, and an organosilicon compound containing a Si-O-B bond.
The manufacturing method of the diaphragm of the sound generating device according to claim 3, characterized in that the hardness of the fluorosilicone rubber film layer is 20A-95A.
The manufacturing method of the diaphragm of the sound generating device according to claim 3, characterized in that the tensile strength of the fluorosilicone rubber film layer is 1 MPa˜15 MPa.
The manufacturing method of the diaphragm of the sound generating device according to claim 3, characterized in that the thickness of the fluorosilicone rubber film layer is 30 μm˜250 μm.
The manufacturing method of the diaphragm of the sound generating device according to claim 3, characterized in that the loss factor of the fluorosilicone rubber film layer is ≥0.1.
The manufacturing method of the diaphragm of the sound generating device according to claim 3, characterized in that, adding fillers, structure control agents and other additives to the base polymer and kneading to form a fluorosilicone compound, the diaphragm The manufacturing method further includes: forming the fluorosilicone rubber film layer by compression molding, injection molding or air pressure molding on the fluorosilicone compound rubber.
A sounding device, characterized in that it includes a vibration system and a magnetic circuit system matched with the vibration system, the vibration system includes a diaphragm and a voice coil combined on one side of the diaphragm, the magnetic circuit system The voice coil is driven to vibrate to drive the diaphragm to produce sound, and the diaphragm is the diaphragm described in claim 1 or 2 .
A sounding device, characterized in that it includes a housing and a magnetic circuit system and a vibration system arranged in the housing, the vibration system includes a voice coil, a first diaphragm and a second diaphragm, the voice coil The top is connected to the first diaphragm, the magnetic circuit system drives the voice coil to vibrate to drive the first diaphragm to produce sound, and the two ends of the second diaphragm are respectively connected to the housing and the sound The bottom of the circle is connected, and the second diaphragm is the diaphragm described in claim 1 or 2.