WO2021082255A1 - 一种发声装置的振膜以及发声装置 - Google Patents
一种发声装置的振膜以及发声装置 Download PDFInfo
- Publication number
- WO2021082255A1 WO2021082255A1 PCT/CN2019/128174 CN2019128174W WO2021082255A1 WO 2021082255 A1 WO2021082255 A1 WO 2021082255A1 CN 2019128174 W CN2019128174 W CN 2019128174W WO 2021082255 A1 WO2021082255 A1 WO 2021082255A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- diaphragm
- polysulfide rubber
- polysulfide
- diaphragm according
- agent
- Prior art date
Links
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- B32B2307/737—Dimensions, e.g. volume or area
- B32B2307/7375—Linear, e.g. length, distance or width
- B32B2307/7376—Thickness
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/02—Copolymers with acrylonitrile
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2381/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur with or without nitrogen, oxygen, or carbon only; Polysulfones; Derivatives of such polymers
- C08J2381/04—Polysulfides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/025—Diaphragms comprising polymeric materials
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/029—Diaphragms comprising fibres
Definitions
- the present invention relates to the technical field of acoustic devices, in particular, the present invention relates to a diaphragm of a sound emitting device and a sound emitting device.
- Existing sound device diaphragms mostly use high modulus plastic film layers (for example: PEEK, PAR, PEI, PI, etc.), softer thermoplastic polyurethane elastomers (for example: TPU) and damping films (for example: acrylic glue) , Silica gel, etc.) composite structure.
- high modulus plastic film layers for example: PEEK, PAR, PEI, PI, etc.
- softer thermoplastic polyurethane elastomers for example: TPU
- damping films for example: acrylic glue
- Silicone rubber materials have good thermal stability, good hydrophobic properties and excellent resilience performance.
- the diaphragm made of silicone rubber has been widely used in the field of sound generating devices.
- the thermal stability and resilience of silicone rubber materials are relatively good, but because of its symmetrical chemical structure, high stereoregularity, symmetrically substituted methyl groups have low steric hindrance, and the modulus or hardness of silicone rubber is relatively low.
- the damping of the material is low, and the product distortion of the silicone rubber diaphragm is large.
- An object of the present invention is to provide a diaphragm of a sound emitting device and a new technical solution for the sound emitting device.
- a diaphragm of a sound emitting device includes at least one elastomer layer, wherein the elastomer layer is made of polysulfide rubber;
- the polysulfide rubber adopts any one of A-type polysulfide rubber, FA-type polysulfide rubber, and ST-type polysulfide rubber;
- the molecular weight of the polysulfide rubber is 1,000 to 500,000.
- the molecular structural formula of the polysulfide rubber is as follows:
- R is a divalent organic group
- L is the molecular chain segment of polysulfide rubber
- X adopts any one of thiol, hydroxyl, halogen, amino, and amide
- n 1 or 2.
- the R includes any one of the following divalent organic groups:
- the polysulfide rubber is mixed with an inorganic filler reinforcing agent, and the inorganic filler reinforcing agent adopts at least one of carbon black, white carbon black, nano titanium dioxide, talc, precipitated calcium carbonate, and barium sulfate.
- the content of the inorganic filler reinforcing agent is 15%-90% of the total amount of the polysulfide rubber.
- the content of the inorganic filler reinforcing agent is 30%-70% of the total amount of the polysulfide rubber.
- the polysulfide rubber is mixed with an anti-aging agent, and the anti-aging agent adopts anti-aging agent N-445, anti-aging agent 246, anti-aging agent 4010, anti-aging agent SP, anti-aging agent RD, anti-aging agent ODA, anti-aging agent OD, At least one of the antioxidant WH-02, the content of the antioxidant is 0.5%-10% of the total amount of the polysulfide rubber.
- the content of the antioxidant is 1% to 5% of the total amount of the polysulfide rubber.
- the polysulfide rubber is mixed with a plasticizer
- the plasticizer is an aliphatic dibasic acid ester plasticizer, a phthalate ester plasticizer, or a benzene polyester plasticizer.
- the plasticizer is an aliphatic dibasic acid ester plasticizer, a phthalate ester plasticizer, or a benzene polyester plasticizer.
- the content of the plasticizer is 1%-10% of the total amount of the polysulfide rubber.
- the content of the plasticizer is 3% to 7% of the total amount of the polysulfide rubber.
- the polysulfide rubber is mixed with an internal mold release agent, and the internal mold release agent is stearic acid, stearylamine, alkyl phosphate, ⁇ -octadecyl- ⁇ -hydroxy poly At least one of the oxyethylene phosphates, the content of the internal release agent is 0.5%-5% of the total amount of the polysulfide rubber.
- the content of the internal release agent is 1%-3% of the total amount of the polysulfide rubber.
- the polysulfide rubber is mixed with a cross-linking agent, and the cross-linking agent is at least one of sulfur and thiuram polysulfide.
- the thiuram polysulfide adopts tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, two At least one of diisobutylthiuram sulfide and bis(1,5-pentylene)thiuram tetrasulfide.
- the diaphragm is a single-layer diaphragm, and the single-layer diaphragm is composed of a polysulfide rubber membrane layer; or,
- the diaphragm is a composite diaphragm, the composite diaphragm includes two, three, four or five diaphragm layers, and the composite diaphragm includes at least one polysulfide rubber diaphragm layer.
- the thickness of the polysulfide rubber film layer is 10 ⁇ m-200 ⁇ m.
- the thickness of the polysulfide rubber film layer is 30 ⁇ m-120 ⁇ m.
- the hardness of the polysulfide rubber is 30-95A.
- the glass transition temperature of the polysulfide rubber is -70-0°C.
- the loss factor of the polysulfide rubber at room temperature is greater than 0.06.
- the elongation at break of the polysulfide rubber is greater than 100%.
- a sound generating device includes a sounding device main body and the above-mentioned diaphragm.
- the diaphragm is arranged on the sounding device main body, and the diaphragm is configured to vibrate and produce sound.
- the inventor of the present invention found that in the prior art, the overall performance of the diaphragm is poor, which is likely to cause poor listening and affect the acoustic performance of the sound generating device. Therefore, the technical task to be achieved or the technical problem to be solved by the present invention has never been thought of or anticipated by those skilled in the art, so the present invention is a new technical solution.
- the present invention discloses a diaphragm made of polysulfide rubber material.
- the diaphragm has good comprehensive performance, can work normally under extreme conditions of high and low temperature, and can maintain good rigidity and recovery. Elasticity and damping performance. Therefore, the sound generating device can be used in an extremely harsh environment, while its acoustic performance can be maintained in a good state.
- FIG. 1 is a comparison diagram of the total harmonic distortion test curve of the diaphragm provided by the present invention and the existing conventional diaphragm.
- Fig. 2 is a test curve of the vibration displacement of different parts of the diaphragm of the sound generating device at different frequencies according to an embodiment of the present invention.
- Fig. 3 is a test curve of the vibration displacement of different parts of the existing diaphragm at different frequencies.
- Figure 4 shows the impedance curves of diaphragms with different hardnesses.
- Fig. 5 is a comparison diagram of the test curves of loudness at different frequencies between the diaphragm provided by the present invention and the existing conventional diaphragm.
- a diaphragm of a sound emitting device includes at least one elastomer layer, wherein the elastomer layer is made of polysulfide rubber.
- the diaphragm can be used in a sound emitting device such as a loudspeaker, especially in a miniature sound emitting device.
- the polysulfide rubber may be any one of A-type polysulfide rubber, FA-type polysulfide rubber, and ST-type polysulfide rubber.
- Type A polysulfide rubber is a condensation polymer of dichloroethane and alkali metal tetrasulfide.
- FA type polysulfide rubber is a polycondensate of dichloroethane, bis-2-chloroethyl formal and alkali metal disulfide.
- ST type polysulfide rubber is a polycondensate of bis-2-chloroethyl formal, trichloropropane and alkali metal polysulfides.
- Those skilled in the art can flexibly select any one of the above three polysulfide rubbers to make the diaphragm of the sounding device according to actual needs.
- the prepared diaphragm has good rigidity, resilience and damping performance.
- the polysulfide rubber has a relatively large molecular weight, and its molecular weight can reach 1,000 to 500,000.
- the molecular structural formula of the polysulfide rubber can be as follows:
- R is a divalent organic group
- L is a polysulfide rubber molecular segment
- X uses thiol, hydroxyl, halogen (for example, F, Cl, Br, I, etc.), amino, and amide. Any one, m is 1 or 2.
- the polysulfide rubber structure includes but is not limited to the above structure.
- the R includes any one of the following divalent organic groups:
- the main chain of polysulfide rubber is entirely composed of single bonds. Since each bond can rotate in space, this makes polysulfide rubber more flexible, which is conducive to the movement or swing of its molecular chain. . Therefore, polysulfide rubber has a lower glass transition temperature, which can bring excellent cold resistance to polysulfide rubber materials, so that it can maintain good high elasticity in low temperature environments. On the other hand, it can make the two molecules of the bonding system easily approach each other and generate adsorption force, so it has good bonding performance, which brings convenience to the bonding process of the original sound device.
- the diaphragm provided by the present invention has good comprehensive performance, especially can work normally under extreme conditions, while maintaining good rigidity, resilience and damping performance, and has low distortion. Therefore, the sound generating device using the diaphragm can be used in an extremely harsh environment, while its acoustic performance is maintained in a good state.
- an inorganic filler reinforcing agent may be mixed in the polysulfide rubber.
- the inorganic filler reinforcing agent includes at least one of carbon black, white carbon black, nano titanium dioxide, talc, precipitated calcium carbonate, and barium sulfate. And, when the mass fraction of the polysulfide rubber itself is 100 parts, the mass parts of the inorganic filler reinforcing agent itself is 15-90 parts, that is, the content of the inorganic filler reinforcing agent is the 15%-90% of the total amount of polysulfide rubber.
- the surface of the inorganic filler reinforcing agent has groups such as hydrogen, carboxyl group, lactone group, free radical, quinone group, etc., which can undergo reactions such as substitution, reduction, and oxidation.
- groups such as hydrogen, carboxyl group, lactone group, free radical, quinone group, etc., which can undergo reactions such as substitution, reduction, and oxidation.
- carbon black is an amorphous structure, and particles form aggregates through physical and chemical bonding with each other.
- the primary structure of carbon black is composed of aggregates, and there are van der Waals forces or hydrogen bonds between the aggregates, which can aggregate into a spatial network structure, that is, the secondary structure of carbon black.
- the surface of carbon black has hydrogen, carboxyl, lactone, free radical, quinone and other groups that can undergo substitution, reduction, oxidation, etc.
- polysulfide rubber because the surface of carbon black and polysulfide rubber molecules dominate The strong interaction between the chain interface, when the material is stressed, the molecular chain is easier to slide on the surface of the carbon black, but it is not easy to separate from the carbon black.
- the polysulfide rubber and the carbon black form a strong bond that can slide. Increase in intensity.
- the mass parts of the polysulfide rubber itself is 100
- the mass parts of the inorganic filler reinforcing agent itself is 15-85 parts, that is, the inorganic filler
- the content of the filler reinforcing agent is 15%-85% of the total amount of the polysulfide rubber.
- the mass parts of the inorganic filler reinforcing agent itself is 15-80 parts, that is, when the content of the inorganic filler reinforcing agent is 15%-80% of the total amount of the polysulfide rubber, it can It better meets the requirements of the present invention for the performance of the diaphragm.
- the mass parts of the inorganic filler reinforcing agent itself is 30-70 parts, that is, the content of the inorganic filler reinforcing agent is 30%-70% of the total amount of the polysulfide rubber.
- the mass parts of the inorganic filler reinforcing agent itself is 30-70 parts, that is, the content of the inorganic filler reinforcing agent is 30%-70% of the total amount of the polysulfide rubber.
- an anti-aging agent may be mixed in the polysulfide rubber.
- the antioxidant can be, for example, at least one of antioxidant N-445, antioxidant 246, antioxidant 4010, antioxidant SP, antioxidant RD, antioxidant ODA, antioxidant OD, and antioxidant WH-02. And, in the case where the mass fraction of the polysulfide rubber itself is 100 parts, the mass parts of the antioxidant itself is 0.5-10 parts, that is, the content of the antioxidant is the total amount of the polysulfide rubber 0.5%-10%.
- the molecular chain of polysulfide rubber will gradually break, generating free radicals and accelerating self-aging.
- the phenomenon is the natural aging phenomenon of polysulfide rubber.
- the autocatalytically active free radicals generated in the polysulfide rubber can be prevented or stopped or slowed down. It should be noted that if the amount of antioxidant added is too small, the effect of prolonging the service life of polysulfide rubber may not be achieved.
- the mass parts of the polysulfide rubber is 100 parts
- the mass parts of the antioxidant itself can be selected in the range of 0.5-10 parts.
- the mass parts of the antioxidant itself is 1-5 parts, that is, the content of the antioxidant is 1%-5% of the total amount of the polysulfide rubber.
- a plasticizer may be mixed in the polysulfide rubber.
- the plasticizer adopts aliphatic dibasic acid ester plasticizers, phthalate ester plasticizers (for example, including phthalate esters and terephthalate esters), and benzene polyacid esters plasticizers.
- Plasticizers, benzoate plasticizers, polyol ester plasticizers, chlorinated hydrocarbon plasticizers, epoxy plasticizers, citrate plasticizers, and polyester plasticizers At least one.
- plasticizers are much smaller than those of polysulfide rubber. They are easier to move. They can conveniently provide the space required for chain segment activities, reduce the glass transition temperature of the material, increase the cold resistance of the material, and improve the material's performance. Processing performance. Excessive plasticizer will precipitate from the inside of the material, which will reduce the mechanical properties of the material. As the amount of plasticizer increases, the glass transition temperature of the material decreases.
- the mass parts of the polysulfide rubber itself is 100 parts
- the mass parts of the plasticizer itself is 1-10 parts, that is, the plasticizer
- the content of the agent is 1%-10% of the total amount of the polysulfide rubber.
- the amount of plasticizer increases, the glass transition temperature of the polysulfide rubber material decreases, but correspondingly, the tensile strength of the polysulfide rubber material also decreases.
- the plasticizer content is 12 the tensile strength of the polysulfide rubber material is greatly reduced.
- excessive plasticizer will precipitate from the inside of the polysulfide rubber material, reducing the mechanical properties of the polysulfide rubber material.
- the mass fraction of the plasticizer itself meets the above range, it can ensure that the performance of the polysulfide rubber can meet the performance requirements of the diaphragm.
- the mass parts of the plasticizer itself is 3-7 parts, that is, the content of the plasticizer is 3%-7% of the total amount of the polysulfide rubber.
- an internal mold release agent may be mixed in the polysulfide rubber.
- the internal mold release agent uses at least one of stearic acid, stearylamine, alkyl phosphate, and ⁇ -octadecyl- ⁇ -hydroxy polyoxyethylene phosphate.
- the Mooney viscosity and green strength of polysulfide rubber are relatively low. And this performance characteristic will cause the polysulfide rubber to have process problems such as sticking rollers and sticking molds in the injection molding process.
- the invention improves the processing performance of the polysulfide rubber by adding an internal release agent to the rubber compound.
- the mixing amount of the internal release agent is small, it is difficult to improve the mucosal problem. However, if the mixing amount of the internal release agent is too large, the adhesion between the polysulfide rubber and the adhesive layer during the later preparation of the diaphragm is likely to decrease, and the performance of the final diaphragm is adversely affected.
- the mass parts of the polysulfide rubber is 100 parts
- the mass parts of the internal mold release agent itself can be 0.5-5 parts, that is, the internal mold release
- the content of the agent is 0.5% to 5% of the total amount of the polysulfide rubber.
- the mass parts of the internal mold release agent itself is 1 to 3 parts, that is, the content of the internal mold release agent is 1% to 3% of the total amount of the polysulfide rubber.
- the content of the internal mold release agent is 1% to 3% of the total amount of the polysulfide rubber.
- a crosslinking agent may be mixed in the polysulfide rubber.
- the crosslinking agent uses at least one of sulfur and thiuram polysulfide.
- the sulfur can shorten the vulcanization time and improve the hardness, compression deformation resistance and elastic modulus of the vulcanized rubber.
- the thiuram polysulfide adopts tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, and diisobutyl disulfide. At least one of kithiuram and bis(1,5-pentylidene)thiuram tetrasulfide.
- the thiuram polysulfide is a vulcanizing agent of a non-sulfur system, which can directly vulcanize rubber when used alone. After the temperature is raised to the vulcanization temperature, the sulfur-containing compound cracks into active sulfur, and the amount of sulfur contained is different due to the different structure of the sulfide. During the vulcanization process, the sulfur-containing compound is thermally cracked into free radicals, and then reacts with the ⁇ -methine in the polysulfide rubber to complete the vulcanization according to the radical chain reaction. In the absence of zinc oxide, it is decomposed into dimethylamine and carbon disulfide. The decomposition products can promote the oxidation of rubber, and the aging performance is seriously reduced. In the presence of zinc oxide, it can react to form zinc dimethyl dithiocarbamate, which has a positive effect on the anti-aging properties of rubber.
- crosslinking agent and the resulting crosslinking points can determine the degree of crosslinking of the polysulfide rubber. Within a certain range, the more cross-linking points and the greater the amount of cross-linking agent, the higher the degree of cross-linking. However, too high a degree of crosslinking will make it more difficult for the molecular chain to move, leading to an increase in the glass transition temperature of the polysulfide rubber and an increase in the damping factor. Moreover, the higher the mechanical strength of the polysulfide rubber material, the lower the elongation at break and the elastic recovery. Those skilled in the art can reasonably control the amount of crosslinking agent according to specific needs.
- the glass transition temperature of the diaphragm is -70-0°C. Because polysulfide rubber itself has a relatively high molecular weight (for example, the molecular weight can be as high as 1,000 to 500,000), and its molecular chain is relatively flexible, it has good low temperature resistance. When the diaphragm satisfies the above glass transition temperature range, the diaphragm of the sound device can maintain a high elastic state at room temperature and has good resilience. In a certain range, the lower the glass transition temperature, the diaphragm can work normally at a lower temperature. When the thickness of the diaphragm is constant, the lower the glass transition temperature, the lower the resonance frequency F0 of the assembled sound device. Among them, the glass transition temperature of the material can be adjusted by changing the content of the inorganic filler reinforcing agent and the content of the plasticizer mixed in the polysulfide rubber.
- the glass transition temperature of the diaphragm provided by the present invention is preferably -50-0°C.
- the diaphragm can not only maintain a high elastic state at room temperature, but also has good resilience. More importantly, even when the temperature is below 0°C, the diaphragm of the sounding device can still maintain good rubber elasticity during operation, so that the sounding device exhibits a higher sound quality. At the same time, the risk of damage to the diaphragm of the sound device in a low temperature environment is reduced and the reliability is higher.
- the elongation at break of the diaphragm is greater than 100%.
- the elongation at break of the diaphragm is greater than 150%.
- the diaphragm of the present invention has a relatively high elongation at break, which makes the diaphragm less likely to have reliability problems such as membrane rupture when used in a sound generating device.
- the strain of the diaphragm provided by the embodiment of the present invention is significantly greater than that of the PEEK diaphragm in the prior art. This indicates that the Young's modulus of the diaphragm provided by the embodiment of the present invention is significantly smaller than that of the PEEK diaphragm in the prior art.
- the PEEK diaphragm of the prior art has an obvious yield point, which is about 0.4-0.5% strain.
- the diaphragm of the sound generating device provided by the present invention does not have a yield point. This shows that the diaphragm provided by the present invention has a wider elastic area and has excellent resilience performance.
- the diaphragm made of polysulfide rubber has good flexibility. For example, its elongation at break is ⁇ 100%. Among them, the molecular chain of polysulfide rubber has a very important influence on the elongation at break, and those skilled in the art can choose according to actual needs. This makes the vibration displacement of the diaphragm of the sound device larger and louder. And the reliability and durability are good. The better the flexibility of the polysulfide rubber material and the greater the elongation at break, the stronger the ability of the diaphragm to resist damage.
- the polysulfide rubber material When the diaphragm is vibrating in a state of large amplitude, the polysulfide rubber material produces a greater strain, and there is a risk of membrane fold, membrane crack or membrane rupture when vibrating for a long time.
- the diaphragm of the present invention using polysulfide rubber as the base material has good flexibility and reduces the risk of damage to the diaphragm. The higher the elongation at break, the lower the breakage rate of the diaphragm in long-term use.
- the polysulfide rubber material provided by the present invention has a wider elastic area.
- the strain of the diaphragm occurs in this area, after the external force is removed, the diaphragm has excellent resilience.
- the diaphragm provided by the present invention can be used continuously at high temperature and has higher damping performance than existing materials. Due to the good resilience of the diaphragm, the sound generating device has a better transient response and lower distortion.
- the diaphragm provided by the present invention has a lower THD (total harmonic distortion) compared to the PEEK diaphragm of the prior art. This shows that the diaphragm provided by the present invention has more excellent anti-polarization ability and better sound quality.
- the diaphragm provided by the invention is in a highly elastic state at room temperature, the molecular chain is easy to move, the friction between the molecules is large, and the damping performance is better.
- the loss factor of the diaphragm is greater than 0.06.
- Excellent damping performance enables the diaphragm to have lower impedance.
- the damping of the diaphragm is improved, the ability of the vibration system of the sound device to suppress the polarization phenomenon during the vibration process is enhanced, and the vibration consistency is good.
- the damping of the existing diaphragm made of engineering plastics is low, the loss factor is usually less than 0.01, and the damping is small.
- the loss factor of the diaphragm provided by the present invention is greater than 0.1.
- Fig. 2 is a test curve of the vibration displacement of different parts of the diaphragm of the sound generating device at different frequencies according to an embodiment of the present invention.
- Fig. 3 is a test curve of the vibration displacement of different parts of the existing conventional diaphragm at different frequencies.
- the diaphragm is a rectangular folded ring diaphragm.
- the abscissa is the frequency (Hz), and the ordinate is the loudness displacement (mm). Take points at the edge position and the center position of the center of the diaphragm for testing.
- the vibration film provided by the present invention has a Shore hardness range of 30-95A.
- the resonance frequency F0 of the sounding device is proportional to the modulus, hardness, and thickness of the diaphragm, while for polysulfide rubber materials, the modulus is proportional to the hardness. Therefore, hardness can be used to reflect the modulus of the diaphragm.
- the strength and hardness of the polysulfide rubber material can be adjusted by reinforcing agents.
- the increase in the amount of molecular chains will increase the intermolecular hydrogen bonds, which in turn will increase the strength and hardness of the polysulfide rubber material and increase the number of cross-linking points.
- the higher the strength and hardness of the polysulfide rubber material the higher the F0 of the prepared diaphragm.
- the loudness of the sound device will be reduced and the bass performance will be worse.
- Figure 4 shows the impedance curves of the diaphragm with the same thickness and different hardness. It can be seen from Fig. 4 that as the hardness increases, the resonance frequency F0 of the sound emitting device increases sharply.
- the diaphragm of the sound emitting device provided by the present invention may be, for example, a folded ring diaphragm or a flat diaphragm.
- the resonance frequency F0 of the sounding device is proportional to the Young's modulus and thickness of the diaphragm.
- the change of F0 can be achieved by changing the thickness and Young's modulus of the diaphragm of the sounding device.
- the specific adjustment principle is as follows:
- Mms is the equivalent vibration mass of the sounding device
- Cms is the equivalent compliance of the sounding device:
- C m1 is the elastic wave compliance
- C m2 is the diaphragm compliance
- the equivalent compliance of the sounding device is the diaphragm compliance:
- W is the total width of the folded ring of the diaphragm
- t is the thickness of the diaphragm
- dvc is the outer diameter of the diaphragm and voice coil
- E is the Young's modulus of the diaphragm material
- u is the Poisson of the diaphragm material ratio.
- the resonance frequency F0 of the sound emitting device is proportional to the modulus and thickness of the diaphragm.
- the modulus of the diaphragm is directly proportional to its hardness. Therefore, hardness can be used instead of its modulus.
- the diaphragm should have sufficient rigidity and damping. Those skilled in the art can adjust the size of F0 by adjusting the hardness and thickness of the speaker diaphragm.
- the Shore hardness of the diaphragm is preferably 30-80A, and the thickness of the diaphragm is 30-120 ⁇ m.
- the resonance frequency F0 of the sound generating device can reach 150-1500 Hz.
- the low frequency performance of the sound device is excellent.
- the diaphragm provided by the present invention may be a single-layer structure or a multi-layer composite diaphragm.
- the single-layer diaphragm is a diaphragm composed of a polysulfide rubber film layer.
- the composite diaphragm is a diaphragm formed by successively stacking multiple polysulfide rubber membrane layers.
- the composite diaphragm may include at least one polysulfide rubber film layer, and the polysulfide rubber film layer is bonded and compounded with a film layer made of other materials to form a composite diaphragm made of multiple materials.
- the multiple membrane layers can be combined by hot pressing or the like to form the above-mentioned composite diaphragm.
- the composite diaphragm may be a two-layer, three-layer, four-layer or five-layer composite diaphragm, which is not limited in the present invention.
- At least one film layer in the composite diaphragm is a polysulfide rubber film layer made of the polysulfide rubber provided by the present invention.
- the thickness can be selected to be 10-200 ⁇ m. Preferably it is 30-120 ⁇ m. When the thickness of the polysulfide rubber film layer is within this range, it can better meet the performance requirements and assembly space requirements of the sound generating device.
- the thickness of the diaphragm will affect its acoustic performance. In general, a lower thickness will affect the reliability of the diaphragm, and a larger thickness will affect the sensitivity of the diaphragm. Therefore, the thickness of the diaphragm provided by the present invention can be controlled between 30 ⁇ m and 120 ⁇ m, for example.
- the thickness range can make the sensitivity of the sound device diaphragm higher, and the elasticity and rigidity of the diaphragm can meet the production requirements of the sound device . In particular, it can be used in miniature sound generating devices.
- the diaphragm can ensure long-term normal use during repeated vibrations, thereby prolonging the service life of the sound generating device.
- the present invention also provides a comparison curve diagram between a specific implementation of the diaphragm provided by the present invention and the existing conventional diaphragm, as shown in FIG. 5.
- Figure 5 shows the test curves (SPL curves) of the loudness of the two diaphragms at different frequencies.
- the diaphragm is a folded ring diaphragm.
- the abscissa is frequency (Hz), and the ordinate is loudness.
- the dotted line is the test curve of the diaphragm provided by the present invention.
- the solid line is the test curve of the conventional diaphragm. It can be seen from the SPL curve that the intermediate frequency performance of the two diaphragms is similar.
- the F0 of the sound device using the diaphragm provided by the present invention is 832 Hz.
- the F0 of the sound device using the conventional diaphragm is 926 Hz. This shows that the low-frequency sensitivity of the diaphragm provided by the present invention is higher than that of the existing PEEK diaphragm. That is to say, the use of the diaphragm provided by the present invention can make the sound generating device have higher loudness and comfort.
- the invention provides a diaphragm, which is obtained by mixing polysulfide rubber material with an auxiliary agent, and then integrally molded by a hot pressing method, and the molding temperature must be higher than the rubber vulcanization temperature.
- the preparation method of the diaphragm provided by the invention is simple, can be used normally under extreme conditions of high and low temperature, and simultaneously takes into account the rigidity, resilience and damping required for the vibration of the diaphragm.
- the present invention also provides a sound generating device.
- the sounding device includes a main body of the sounding device and the above-mentioned diaphragm made of polysulfide rubber.
- the polysulfide rubber may be any one of A-type polysulfide rubber, FA-type polysulfide rubber, and ST-type polysulfide rubber, which is not limited in the present invention.
- the vibrating membrane is arranged on the main body of the sound generating device, and the vibrating membrane is configured to be driven to vibrate and generate sound through vibration.
- the main body of the sound generating device may be equipped with components such as a coil, a magnetic circuit system, etc., and the diaphragm is driven to vibrate through electromagnetic induction.
- the sound generating device provided by the present invention has excellent acoustic performance.
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Abstract
Description
Claims (21)
- 一种发声装置的振膜,其特征在于:所述振膜包括至少一层弹性体层,其中,所述弹性体层采用聚硫橡胶制成;所述聚硫橡胶采用A型聚硫橡胶、FA型聚硫橡胶、ST型聚硫橡胶中的任意一种;所述聚硫橡胶的分子量为1000-500000。
- 根据权利要求1所述的振膜,其特征在于:所述聚硫橡胶中混合有无机填料补强剂,所述无机填料补强剂采用炭黑、白炭黑、纳米钛白粉、滑石粉、沉淀碳酸钙、硫酸钡中的至少一种,所述无机填料补强剂的含量为所述聚硫橡胶总量的15%-90%。
- 根据权利要求4所述的振膜,其特征在于:所述无机填料补强剂的含量为所述聚硫橡胶总量的30%-70%。
- 根据权利要求1所述的振膜,其特征在于:所述聚硫橡胶中混合有防老剂,所述防老剂采用防老剂N-445、防老剂246、防老剂4010、防老剂SP、防老剂RD、防老剂ODA、防老剂OD、防老剂WH-02中的至少一种,所述防老剂的含量为所述聚硫橡胶总量的0.5%-10%。
- 根据权利要求6所述的振膜,其特征在于:所述防老剂的含量为所述聚硫橡胶总量的1%-5%。
- 根据权利要求1所述的振膜,其特征在于:所述聚硫橡胶中混合有增塑剂,所述增塑剂采用脂肪族二元酸酯类增塑剂、苯二甲酸酯类增塑剂、苯多酸酯类增塑剂、苯甲酸酯类增塑剂、多元醇酯类增塑剂、氯化烃类增塑剂、环氧类增塑剂、柠檬酸酯类增塑剂、聚酯类增塑剂中的至少一种,所述增塑剂的含量为所述聚硫橡胶总量的1%-10%。
- 根据权利要求8所述的振膜,其特征在于:所述增塑剂的含量为所述聚硫橡胶总量的3%-7%。
- 根据权利要求1所述的振膜,其特征在于:所述聚硫橡胶中混合有内脱模剂,所述内脱模剂采用硬脂酸、十八烷基胺、磷酸烷基酯、α-十八烷基-ω-羟基聚氧乙烯磷酸酯中的至少一种,所述内脱模剂的含量为所述聚硫橡胶总量的0.5%-5%。
- 根据权利要求10所述的振膜,其特征在于:所述内脱模剂的含量为所述聚硫橡胶总量的1%-3%。
- 根据权利要求1所述的振膜,其特征在于:所述聚硫橡胶中混合 有交联剂,所述交联剂采用硫磺、秋兰姆多硫化物中的至少一种。
- 根据权利要求12所述的振膜,其特征在于:所述秋兰姆多硫化物采用一硫化四甲基秋兰姆、二硫化四甲基秋兰姆、二硫化四乙基秋兰姆、二硫化四丁基秋兰姆、二硫化二异丁基秋兰姆、四硫化双(1,5-亚戊基)秋兰姆中的至少一种。
- 根据权利要求1所述的振膜,其特征在于:所述振膜为单层振膜,所述单层振膜采用一层聚硫橡胶膜层构成;或者是,所述振膜为复合振膜,所述复合振膜包括两层、三层、四层或五层膜层,所述复合振膜至少包括一层聚硫橡胶膜层。
- 根据权利要求14所述的振膜,其特征在于:所述聚硫橡胶膜层的厚度为10μm-200μm。
- 根据权利要求15所述的振膜,其特征在于:所述聚硫橡胶膜层的厚度为30μm-120μm。
- 根据权利要求1所述的振膜,其特征在于:所述聚硫橡胶的硬度为30-95A。
- 根据权利要求1所述的振膜,其特征在于:所述聚硫橡胶的玻璃化转变温度为-70-0℃。
- 根据权利要求1所述的振膜,其特征在于:所述聚硫橡胶在室温下损耗因子大于0.06。
- 根据权利要求1所述的振膜,其特征在于:所述聚硫橡胶的断裂伸长率大于100%。
- 一种发声装置,其特征在于,包括发声装置主体以及权利要求1-20任意一项所述的振膜,所述振膜设置在所述发声装置主体上,所述振膜被配置为能振动发声。
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CN111935602B (zh) * | 2020-09-23 | 2021-01-22 | 歌尔股份有限公司 | 一种发声装置的振膜及其制备方法、发声装置 |
CN111923527A (zh) * | 2020-09-23 | 2020-11-13 | 歌尔股份有限公司 | 一种扬声器的复合振膜及其制备方法、扬声器 |
CN114827874B (zh) * | 2021-01-29 | 2023-07-14 | 歌尔股份有限公司 | 振膜及发声装置 |
CN114071329B (zh) * | 2021-10-29 | 2024-08-20 | 歌尔股份有限公司 | 发声装置的振膜及发声装置 |
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