CN110798779A - Vibrating diaphragm for miniature sound generating device and miniature sound generating device - Google Patents
Vibrating diaphragm for miniature sound generating device and miniature sound generating device Download PDFInfo
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- CN110798779A CN110798779A CN201911055410.5A CN201911055410A CN110798779A CN 110798779 A CN110798779 A CN 110798779A CN 201911055410 A CN201911055410 A CN 201911055410A CN 110798779 A CN110798779 A CN 110798779A
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
- H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
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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
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
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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
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
- H04R2231/003—Manufacturing aspects of the outer suspension of loudspeaker or microphone diaphragms or of their connecting aspects to said diaphragms
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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
Abstract
The invention discloses a vibrating diaphragm for a miniature sound generating device and the miniature sound generating device, wherein the vibrating diaphragm is made of polyether rubber, the polyether rubber comprises at least one of propylene oxide rubber, epichlorohydrin rubber and copolymerized epichlorohydrin rubber, the glass transition temperature range of the vibrating diaphragm is-55-0 ℃, and when the constant elongation of the vibrating diaphragm is 20%, the elastic recovery rate of the vibrating diaphragm is more than 85%; the vibrating diaphragm provided by the invention has better structural stability, polarization resistance and low-frequency sensitivity; the miniature sound production device provided by the invention has better acoustic performance.
Description
Technical Field
The invention relates to the technical field of electronic products, in particular to a vibrating diaphragm for a miniature sound generating device and the miniature sound generating device.
Background
The existing diaphragm for the miniature sound generating device mostly adopts multilayer composite materials, such as engineering plastics like PEEK, PAR, PEI and PI, elastomer materials like TPU and TPEE, and adhesive films like acrylic adhesive film and silica gel adhesive film. In addition, silicone rubber has good thermal stability, good hydrophobic property and excellent resilience, and is also gradually used for manufacturing diaphragms with the improvement of high power, waterproof and high sound quality requirements.
The above materials all suffer from their own disadvantages. For example, engineering plastics such as PEEK and PAR have good temperature resistance, but have poor material resilience, and the product is easy to generate film folding and cannot play a waterproof role. The melting point of TPU, TPEE and other elastomer materials is lower, and the temperature resistance is poorer. Although the silicon rubber material has good thermal stability and rebound resilience, the silicon rubber diaphragm has high product distortion due to the fact that the silicon rubber material has symmetrical chemical structure, high structural regularity, small steric hindrance of symmetrically substituted methyl groups and relatively low modulus or hardness of the silicon rubber, and the damping performance of the material is low.
Therefore, the comprehensive performance of the diaphragm is poor, and the requirement on the comprehensive performance of the miniature sound production device cannot be met. Therefore, it is a major technical problem in the art to provide a diaphragm for a miniature sound generating apparatus with high overall performance and high reliability.
Disclosure of Invention
One object of the present invention is to provide a diaphragm for a miniature sound generating apparatus and a miniature sound generating apparatus, wherein the diaphragm has better structural stability, polarization resistance and low-frequency sensitivity; the miniature sound production device has better acoustic performance.
According to a first aspect of the present invention, a diaphragm for a miniature sound generating apparatus is provided, where the diaphragm is made of polyether rubber, the polyether rubber includes at least one of propylene oxide rubber, epichlorohydrin rubber and copolyether rubber, a glass transition temperature range of the diaphragm is-55 to 0 ℃, and an elastic recovery rate of the diaphragm is greater than 85% when a constant elongation rate of the diaphragm is 20%.
Optionally, a vulcanizing agent is mixed in the polyether rubber, a vulcanizing system of the vulcanizing agent includes at least one of a thiourea vulcanizing system, a polyamine vulcanizing system, an amine/sulfur compound vulcanizing system, a triazine derivative vulcanizing system, and a dithioic vulcanizing system, the mass part of the polyether rubber is 100 parts, and the mass part of the vulcanizing agent is 1-15 parts.
Optionally, the vulcanizing agent is 3-10 parts by weight per se.
Optionally, a reinforcing agent is mixed in the polyether rubber, the reinforcing agent comprises at least one of carbon black, silica, calcium carbonate, barium sulfate, organic montmorillonite and metal salt of unsaturated carboxylic acid, the mass part of the polyether rubber is 100 parts, and the mass part of the reinforcing agent is 2-80 parts.
Optionally, the hardness of the polyether rubber diaphragm is in a range of 30-85A.
Optionally, the diaphragm made of the polyether rubber can continuously work for more than 3 days at 180 ℃.
Optionally, an anti-aging agent is mixed in the polyether rubber, the anti-aging agent comprises at least one of 2-Mercaptobenzimidazole (MB), 2, 4-trimethyl-1, 2-dihydroquinoline polymer (TMDQ), copper dimethyldithiocarbamate, dibasic acid, nickel N, N-dibutyldithiocarbamate (NBC), 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 and anti-aging agent WH-02, the mass part of the polyether rubber is 100 parts, and the mass part of the anti-aging agent is 0.5-10 parts.
Optionally, the anti-aging agent is 1-5 parts by mass.
Optionally, the diaphragm is a single-layer diaphragm, and the single-layer diaphragm is formed by a polyether rubber film layer;
or, the vibrating diaphragm is a composite vibrating diaphragm, the composite vibrating diaphragm comprises two layers, three layers, four layers or five layers of film layers, and the composite vibrating diaphragm at least comprises one layer of polyether rubber film layer.
Optionally, the thickness of the polyether rubber film layer is 10-200 μm.
According to a second aspect of the present invention, there is provided a miniature sound generating apparatus, comprising a miniature sound generating apparatus main body and the vibrating diaphragm, wherein the vibrating diaphragm is disposed on the miniature sound generating apparatus main body, and the vibrating diaphragm is configured to generate sound by vibration.
The invention has the technical effects that the invention discloses a vibrating diaphragm for a miniature sound generating device and the miniature sound generating device, wherein the vibrating diaphragm is made of polyether rubber, and has better structural stability, polarization resistance and low-frequency sensitivity; the miniature sound production device has better acoustic performance.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a test curve of vibration displacement of different parts of a diaphragm of a miniature sound generating device according to an embodiment of the present invention at different frequencies;
FIG. 2 is a test curve of vibration displacement of different parts of a conventional diaphragm under different frequencies;
FIG. 3 is a harmonic distortion (THD) test curve for a diaphragm of one embodiment of the present invention and a conventional PEEK diaphragm;
FIG. 4 is a stress-strain curve of a diaphragm of one embodiment of the present invention and a conventional PEEK diaphragm;
fig. 5 is a test curve (SPL curve) of loudness at different frequencies for a diaphragm of one embodiment of the present invention and a conventional diaphragm.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The polyether rubber is a saturated hydrocarbon polyether elastomer obtained by ring-opening polymerization of an epoxy group-containing cyclic ether compound (alkylene oxide). The main chain is in an ether structure, molecules are easy to rotate due to the existence of oxygen atoms, the main chain is flexible and free of double bonds, and the side chain contains polar groups or unsaturated bonds. The structural characteristics determine that the polyether rubber has the characteristics of ozone resistance, weather resistance, chemical resistance, cold resistance and good processability.
The invention provides a vibrating diaphragm for a miniature sound production device, which is made of polyether rubber. The polyether rubber includes at least one of propylene oxide rubber, epichlorohydrin rubber and copolymerized epichlorohydrin rubber.
Specifically, the molecular structure of the polyether rubber is as follows:
in the above formula, n, m and p are natural numbers, R1、R2、R3is-CH3、-CH2Cl、-CH＝CH2and-H.
Compared with engineering plastics, the polyether rubber diaphragm provided by the invention has a wider elastic area, and because polyether rubber molecules are easy to rotate, a main chain is smooth and free of double bonds, when the strain of the diaphragm occurs in the area, after an external force is removed, the diaphragm has excellent resilience, when the fixed elongation of the diaphragm is 20%, the elastic recovery rate of the diaphragm is more than 85%, the diaphragm has less swinging vibration in the vibration process, and the tone quality and listening stability are better.
The polyether rubber diaphragm provided by the invention is in a high elastic state at room temperature, molecular chains are easy to move, the intermolecular friction force is large, the polyether rubber diaphragm has better damping performance, and the loss factor at room temperature is more than 0.06, preferably more than 0.1.
The diaphragm has excellent damping performance and a lower quality factor Q. The damping of the vibrating diaphragm is improved, the vibration system has strong capability of inhibiting the polarization phenomenon in the vibration process, and the vibration consistency is good. The common engineering plastic diaphragm has low damping, the loss factor of the diaphragm is generally less than 0.01, and the damping property is small.
Fig. 1 is a test curve of vibration displacement of different parts of a diaphragm of a miniature sound-generating device under different frequencies according to one embodiment of the invention. Fig. 2 is a test curve of vibration displacement of different parts of a conventional diaphragm under different frequencies.
Wherein, the vibrating diaphragm is a rectangular corrugated rim vibrating diaphragm. The abscissa is frequency (Hz) and the ordinate is loudness displacement (mm). And (4) taking points at the edge position and the center position of the center part of the diaphragm for testing.
It can be seen that the curves in fig. 1 are more concentrated, while the curves in fig. 2 are more dispersed. The vibrating diaphragm has the advantages that vibration consistency of all parts of the vibrating diaphragm is better, swing vibration of the vibrating diaphragm is less in the vibrating process, and tone quality and listening stability are better.
Fig. 3 is a harmonic distortion (THD) test curve of a diaphragm according to an embodiment of the present invention and a conventional PEEK diaphragm, and it can be seen from fig. 3 that the diaphragm according to the embodiment of the present invention has a lower THD (total harmonic distortion) compared to the conventional PEEK diaphragm, which indicates that the diaphragm according to the present invention has a better anti-polarization capability and a better sound quality.
Optionally, a vulcanizing agent is mixed in the polyether rubber, and a vulcanizing system of the vulcanizing agent includes at least one of a thiourea-based vulcanizing system, a polyamine vulcanizing system, an amine/sulfur compound vulcanizing system, a triazine-based derivative vulcanizing system, and a disulfide-based vulcanizing system. The addition of the vulcanizing agent contributes to the formation of crosslinking points in the polyether rubber and improves the degree of crosslinking of the polymer. With the increase of the dosage of the vulcanizing agent, the crosslinking degree of the polyether rubber is increased, the movement of a molecular chain is limited, the glass transition temperature is increased, and the elongation at break is reduced. Therefore, when the mass portion of the polyether rubber is 100 parts, the mass portion of the vulcanizing agent needs to be controlled to be 1-15 parts. Preferably, the vulcanizing agent is 3 to 10 parts by mass per se. Under the condition of the above parts by weight, the polyether rubber can be ensured to have a proper crosslinking degree, and the requirements on the glass transition temperature and the mechanical property of the polyether rubber diaphragm material can be met.
The polyether rubber has high molecular weight, and oxygen atoms exist in molecules, so that the molecules are easy to rotate, molecular chains of the polyether rubber are soft, and the polyether rubber has excellent low-temperature resistance. On the basis, in order to enable the polyether rubber diaphragm to keep a high elastic state at normal temperature and have good rebound resilience, the glass transition temperature of the polyether rubber diaphragm needs to be controlled within the range of-55-0 ℃. Within a certain range, the lower the glass transition temperature is, the lower the temperature at which the diaphragm can normally operate.
In order to keep the polyether rubber diaphragm in good rubber elasticity all the time when the polyether rubber diaphragm works in cold regions below-10 ℃, so that the micro sound production device shows high sound quality and reduces the risk of the diaphragm damage in low-temperature environments, the glass transition temperature of the polyether rubber diaphragm needs to be controlled within the range of-45 to-10 ℃.
Optionally, the polyether rubber has excellent toughness, and then by adding a proper amount of vulcanizing agent, the elongation at break of the polyether rubber is greater than 100%, preferably greater than 150%, and the diaphragm has a higher elongation at break, so that the diaphragm is not prone to reliability problems such as membrane rupture and the like when used in a miniature sound production device.
Fig. 4 is a stress-strain curve of a diaphragm according to an embodiment of the present invention and a conventional PEEK diaphragm, and it can be seen from fig. 4 that, under the same stress, the strain of the diaphragm provided by the embodiment of the present invention is significantly greater than that of the conventional PEEK diaphragm. This shows that the young's modulus of the diaphragm provided by the embodiment of the present invention is significantly smaller than that of the conventional PEEK diaphragm.
In addition, PEEK diaphragms form a significant yield point, around strain 0.4-0.5%. The diaphragm provided by the invention has no yield point, which shows that the diaphragm provided by the invention has a wider elastic area and excellent resilience.
The polyether rubber diaphragm has good flexibility, for example, the elongation at break is more than or equal to 100%. This results in a greater vibration displacement and loudness of the diaphragm. And has good reliability and durability. The better the flexibility of the diaphragm material, the greater the elongation at break, the stronger the diaphragm resistance to failure. When the vibrating diaphragm is in the vibration of a large-amplitude state, the vibrating diaphragm material generates large strain, and the risk of membrane folding, membrane cracking or membrane breaking can occur during long-time vibration. The vibrating diaphragm of the invention which takes the polyether rubber as the base material has good flexibility, and the risk of the vibrating diaphragm damage is reduced.
Optionally, because polyether rubber diaphragm material has stable crosslinked structure, polyether rubber diaphragm has better high temperature resistance, but continuous operation more than 3 days under 180 ℃, can satisfy miniature sound generating mechanism to high low temperature's demand, the risk that the structure collapses can not appear high temperature in-service use.
Optionally, a reinforcing agent is mixed in the polyether rubber, the reinforcing agent comprises at least one of carbon black, silica, calcium carbonate, barium sulfate, organic montmorillonite and metal salt of unsaturated carboxylic acid, and the reinforcing agent is 2-80 parts by weight when the polyether rubber is 100 parts by weight. Preferably, the reinforcing agent is 5 to 60 parts by mass per se.
The surface of the reinforcing agent has a group such as hydrogen, carboxyl group, lactone group, radical, quinone group, or the like, which can undergo substitution, reduction, oxidation, or the like. After the reinforcing agent is mixed into the polyether rubber, due to strong interaction between the interface of the reinforcing agent and the polyether rubber, when the polyether rubber is stressed, molecular chains are easy to slide on the surfaces of the reinforcing agent particles, but are not easy to be separated from the reinforcing agent particles, the polyether rubber and the reinforcing agent particles form a slidable strong bond, and the mechanical strength is increased.
Taking carbon black as an example, carbon black is an amorphous structure, and particles form aggregates by physicochemical bonding with each other. The primary structure of the carbon black is composed of aggregates, and van der waals force or hydrogen bonds exist among the aggregates, so that the aggregates can be aggregated into a spatial network structure, namely the secondary structure of the carbon black. The carbon black has the above-mentioned groups on the surface. The carbon black particles can form the relationship with the polyether rubber molecular chain, and the mechanical strength of the polyether rubber is enhanced.
The strength of the polyether rubber material is mainly adjusted by mixing a reinforcing agent, but if the mechanical strength is too high, the resonant frequency of the miniature sound production device is too high, and the low-frequency response capability is reduced. Therefore, the hardness of the polyether rubber diaphragm may be in the range of 30 to 85A, preferably 35 to 80A. The mechanical strength of the polyether rubber diaphragm can reach 0.5-50MPa, preferably 1-30MPa at room temperature.
The resonant frequency F0 of the miniature sound generating device is proportional to the modulus and thickness of the diaphragm. In the case of polyether rubbers, the modulus is proportional to the hardness. Therefore, the modulus of the polyether rubber diaphragm can be expressed by hardness. The higher the strength and hardness of the rubber diaphragm material, the higher the F0 of the diaphragm material, resulting in a reduced loudness and a poor bass sound of the miniature sound generating apparatus. Table 1 gives the F0 values for diaphragms having the same thickness but different stiffness, and from table 1 it can be seen that F0 increases dramatically with increasing stiffness of the diaphragm material.
| Hardness (A) | 30 | 35 | 60 | 80 | 85 |
| F0(Hz) | 489 | 521 | 716 | 831 | 902 |
The vibrating diaphragm for the miniature sound production device provided by the invention is a corrugated ring vibrating diaphragm or a flat-plate vibrating diaphragm. The resonant frequency F0 of this miniature sound generating mechanism is directly proportional to the Young's modulus and the thickness of vibrating diaphragm, can realize F0's change through the thickness and the Young's modulus that change the vibrating diaphragm, and the concrete theory of regulation is as follows:
wherein Mms is the equivalent vibration mass of miniature sound generating mechanism, Cms is miniature sound generating mechanism's equivalent compliance:
wherein, Cm1For compliance with the elastic wave, Cm2The diaphragm compliance is achieved. When there is no elastic wave design, the equivalent compliance of the miniature sound generating device is the diaphragm compliance:
wherein W is the total width of the bending ring part of the diaphragm, and t is the thickness of the diaphragm; dvc is the joint outer diameter of the vibrating diaphragm and the voice coil; e is the Young modulus of the vibrating diaphragm material; a is1And a2To correct the coefficient，a1The value of (a) depends on the shape of the diaphragm substrate2Equal to h (edge height)/W; u is the Poisson's ratio of the vibrating diaphragm material.
It can be seen that in order to obtain a full bass and comfortable hearing, the diaphragm should have sufficient stiffness and damping while the miniature sound generating device has a low F0. The size of F0 can be adjusted by one skilled in the art by adjusting the stiffness and thickness of the diaphragm. Preferably, the shore hardness of the diaphragm is preferably 35-80A. The thickness of the diaphragm is 30-120 μm. This enables the resonant frequency F0 of the miniature sound generating device to reach 150-1500 Hz. The low-frequency performance of the miniature sound production device is excellent.
Fig. 5 is a test curve (SPL curve) of loudness at different frequencies for a diaphragm of one embodiment of the present invention and a conventional diaphragm. The vibrating diaphragm is a corrugated ring vibrating diaphragm. The abscissa is frequency (Hz) and the ordinate is loudness.
The dotted line is a test curve of the diaphragm provided in the embodiment of the present invention, and the solid line is a test curve of a conventional diaphragm.
As can be seen from fig. 5, the diaphragm provided in the embodiment of the present invention is closer to the micro sound generating device F0 of the conventional diaphragm, but the low-frequency sensitivity of the diaphragm provided in the embodiment of the present invention is higher than that of the conventional diaphragm. That is to say, the miniature sound generating device adopting the diaphragm provided by the embodiment of the invention has higher loudness and comfort level.
Optionally, the polyether rubber is mixed with an anti-aging agent, wherein the anti-aging agent comprises at least one of 2-Mercaptobenzimidazole (MB), 2, 4-trimethyl-1, 2-dihydroquinoline polymer (TMDQ), copper dimethyldithiocarbamate, dibasic acid (including azelaic acid, isophthalic acid and the like), nickel N, N-dibutyldithiocarbamate (NBC), 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 and anti-aging agent WH-02.
In the use process of the polyether rubber, the molecular chain of the polyether rubber is broken to generate free radicals along with the prolonging of time, and the phenomenon is the natural aging phenomenon of the polyether rubber. The self-catalysis phenomenon of generating active free radicals in the polyether rubber can be prevented, stopped or slowed down by mixing the anti-aging agent in the polyether rubber.
When the addition amount of the anti-aging agent is too small, the effect of prolonging the service life of the polyether rubber cannot be achieved; and if the anti-aging agent is excessively added, the mechanical property of the polyether rubber material is possibly reduced because the anti-aging agent cannot be well dissolved with the polyether rubber elastomer and is difficult to uniformly disperse. Therefore, in the case where the polyether rubber is 100 parts by mass, the part by mass of the antioxidant itself needs to be controlled to 0.5 to 10 parts. Preferably, the anti-aging agent per se is 1-5 parts by mass.
Optionally, the diaphragm may be a single-layer diaphragm or a multi-layer composite diaphragm. The single-layer vibrating diaphragm is formed by a polyether rubber film layer; the composite diaphragm is formed by sequentially laminating a plurality of polyether rubber film layers. Or, the composite diaphragm may include at least one polyether rubber film layer, and the polyether rubber film layer is laminated and compounded with films made of other materials to form the composite diaphragm made of multiple materials. The composite diaphragm comprises two, three, four or five film layers, which is not limited in the present invention.
For the polyether rubber film layer, the thickness thereof may be 10 to 200. mu.m, preferably 30 to 120. mu.m. When the thickness of the polyether rubber film layer is within the range, the performance requirement and the assembly space requirement of the miniature sound generating device can be better met.
Optionally, the polyether rubber diaphragm is prepared by adopting a mould pressing-injection molding or air pressure molding mode, and the polyether rubber diaphragm has very low glass transition temperature, is good in strength and toughness of the diaphragm material and can be used at high temperature for a long time, so that the diaphragm can be quickly molded by adopting a simple mould pressing-injection molding or air pressure molding mode, and the production efficiency is improved.
The invention also provides a miniature sound-generating device, which comprises a miniature sound-generating device main body and the vibrating diaphragm made of the polyether rubber, wherein the vibrating diaphragm is arranged on the miniature sound-generating device main body, and is configured to vibrate and generate sound through vibration. The miniature sound generating device body can be provided with a coil, a magnetic circuit system and other components, and the vibrating diaphragm is driven to vibrate through electromagnetic induction.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. The vibrating diaphragm for the miniature sound production device is characterized in that the vibrating diaphragm is made of polyether rubber, the polyether rubber comprises at least one of epoxypropane rubber, epichlorohydrin rubber and copolymerized epichlorohydrin rubber, the glass transition temperature range of the vibrating diaphragm is-55-0 ℃, and when the fixed elongation of the vibrating diaphragm is 20%, the elastic recovery rate of the vibrating diaphragm is greater than 85%.
2. The diaphragm of claim 1, wherein a vulcanizing agent is mixed in the polyether rubber, a vulcanizing system of the vulcanizing agent includes at least one of a thiourea vulcanizing system, a polyamine vulcanizing system, an amine/sulfur compound vulcanizing system, a triazine derivative vulcanizing system, and a disulfide vulcanizing system, the polyether rubber is 100 parts by mass, and the vulcanizing agent is 1 to 15 parts by mass.
3. The diaphragm for the miniature sound generating apparatus as claimed in claim 2, wherein the vulcanizing agent is present in an amount of 3 to 10 parts by mass.
4. The diaphragm according to claim 1, wherein a reinforcing agent is mixed in the polyether rubber, the reinforcing agent comprises at least one of carbon black, silica, calcium carbonate, barium sulfate, organic montmorillonite and metal salt of unsaturated carboxylic acid, the mass fraction of the polyether rubber is 100 parts, and the mass fraction of the reinforcing agent is 2-80 parts.
5. The diaphragm of claim 4, wherein the diaphragm has a hardness in the range of 30 to 85A.
6. The diaphragm of claim 1, wherein the polyether rubber is mixed with an anti-aging agent, the anti-aging agent comprises at least one of 2-Mercaptobenzimidazole (MB), 2, 4-trimethyl-1, 2-dihydroquinoline polymer (TMDQ), copper dimethyldithiocarbamate, dibasic acid, nickel N, N-dibutyldithiocarbamate (NBC), 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 and anti-aging agent WH-02, the polyether rubber is 100 parts by mass, and the anti-aging agent is 0.5-10 parts by mass.
7. The diaphragm for the miniature sound production device as claimed in claim 6, wherein the anti-aging agent is present in an amount of 1 to 5 parts by mass.
8. The diaphragm for the miniature sound generating device according to claim 1, wherein the diaphragm is a single-layer diaphragm, and the single-layer diaphragm is formed by a polyether rubber film layer;
or, the vibrating diaphragm is a composite vibrating diaphragm, the composite vibrating diaphragm comprises two layers, three layers, four layers or five layers of film layers, and the composite vibrating diaphragm at least comprises one layer of polyether rubber film layer.
9. The diaphragm of claim 8, wherein the thickness of the polyether rubber film layer is 10-200 μm.
10. A miniature sound producing device, comprising a miniature sound producing device main body and the diaphragm of any one of claims 1-9, wherein the diaphragm is disposed on the miniature sound producing device main body, and the diaphragm is configured to vibrate and produce sound.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911055410.5A CN110798779B (en) | 2019-10-31 | 2019-10-31 | Vibrating diaphragm for miniature sound generating device and miniature sound generating device |
| PCT/CN2019/128038 WO2021082243A1 (en) | 2019-10-31 | 2019-12-24 | Vibrating diaphragm for miniature sound generation device and miniature sound generation device |
Applications Claiming Priority (1)
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| CN113542987A (en) * | 2020-04-17 | 2021-10-22 | 歌尔股份有限公司 | Loudspeaker diaphragm and sound generating device |
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| WO2021082243A1 (en) | 2021-05-06 |
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