阅读说明：本技术 用于发声装置的振动板及发声装置 (Vibrating plate for sound production device and sound production device ) 是由 惠冰 王翠翠 凌风光 李春 于 2020-11-02 设计创作，主要内容包括：本申请实施例提供了一种用于发声装置的振动板及发声装置,所述振动板至少部分采用复合材料制成,所述复合材料包括聚合物基体和分散在所述聚合物基体中的补强材料,所述补强材料包括滑石粉和云母中的至少一种,所述补强材料在所述复合材料中的质量分数范围为10％-70％。本申请实施例提供的振动板至少部分采用复合材料制成,所述复合材料通过将所述滑石粉和/或云母补强材料分散在所述聚合物基体中,增强了所述振动板的模量和结构强度,使得安装所述振动板的发声装置具有较宽的频响范围和较低的失真,提高了发声装置的发声效果。(The embodiment of the application provides a vibration board and sound generating mechanism for sound generating mechanism, the vibration board is at least partly to adopt combined material to make, combined material includes the polymer base and disperses the reinforcement material in the polymer base, the reinforcement material includes at least one in talcum powder and the mica, the reinforcement material is in the mass fraction scope in the combined material is 10% -70%. The vibration board that this application embodiment provided at least part adopts combined material to make, combined material is through inciting somebody to action talcum powder and/or mica reinforcement material disperse in the polymer base member, strengthened the modulus and the structural strength of vibration board make the installation the sound generating mechanism of vibration board has the frequency response scope of broad and lower distortion, has improved sound generating mechanism's vocal effect.)

1. A vibration plate for a sound production device is characterized in that at least part of the vibration plate is made of a composite material, the composite material comprises a polymer matrix and a reinforcing material dispersed in the polymer matrix, the reinforcing material comprises at least one of talcum powder and mica, and the mass fraction range of the reinforcing material in the composite material is 10% -70%.

2. A vibrating plate according to claim 1, wherein the polymer matrix comprises at least one of polypropylene (PP), Polycarbonate (PC), Polyamide (PA), Polyoxymethylene (POM), polyphenylene oxide (PPO), Polyphenylene Sulfide (PPs), polyether ether ketone (PEEK) and Polyetherimide (PEI).

3. A vibration plate according to claim 1, wherein the talc has a particle diameter in a range of 0.3 μm to 100 μm.

4. A vibration plate according to claim 1, wherein the mica comprises at least one of sericite, muscovite, phlogopite, lepidolite, and biotite.

5. A vibration plate according to claim 1, wherein said reinforcing material comprises talc and mica in a mass ratio ranging from 0.1 to 20.

6. The vibration plate according to claim 1, wherein a modulus of the vibration plate is 2GPa or more.

7. A vibration plate according to claim 1, wherein a molding manner of the vibration plate is injection molding or blister molding.

8. The vibrating plate according to claim 1, wherein the vibrating plate is a single-layer vibrating plate made of the composite material;

or the vibration plate is a composite vibration plate, the composite vibration plate comprises at least two layers, and at least one layer of the composite vibration plate comprises the composite material.

9. A vibration plate according to claim 8, wherein the single layer vibration plate has a thickness in a range of 50 μm to 2800 μm.

10. A sound-generating device comprising a vibration system and a magnetic circuit system cooperating with said vibration system, said vibration system comprising a vibration plate according to any one of claims 1 to 9.

Technical Field

The application belongs to the technical field of electronic products, specifically, this application relates to a vibration board and sound generating mechanism for sound generating mechanism.

Background

A speaker is an important acoustic component in a portable electronic device, and is used to convert a sound wave electric signal into a sound signal and generate an external sound. In order to reduce the distortion of the speaker and to improve the sensitivity of the speaker, a vibration plate is usually fixed to the center of the vibration film to enhance the rigidity of the center of the vibration film.

The conventional vibrating plate is generally formed by punching wood chips, plastic or aluminum, which results in low strength of the vibrating plate. In the vibrating process of the vibrating diaphragm, the vibrating plate may be deformed, which affects the sound quality and the service life of the speaker.

Disclosure of Invention

An object of the embodiment of the application is to provide a vibrating plate for a sound generating device and a technical scheme of the sound generating device.

According to a first aspect of embodiments of the present application, there is provided a vibration plate for a sound generating apparatus, the vibration plate being at least partially made of a composite material, the composite material including a polymer matrix and a reinforcing material dispersed in the polymer matrix, the reinforcing material including at least one of talc and mica, and a mass fraction of the reinforcing material in the composite material being in a range of 10% to 70%.

Optionally, the polymer matrix comprises at least one of polypropylene (PP), Polycarbonate (PC), Polyamide (PA), Polyoxymethylene (POM), polyphenylene oxide (PPO), Polyphenylene Sulfide (PPs), Polyetheretherketone (PEEK) and Polyetherimide (PEI).

Optionally, the talc powder has a particle size in the range of 0.3 μm to 100 μm.

Optionally, the mica comprises at least one of sericite, muscovite, phlogopite, lepidolite, and biotite.

Optionally, the reinforcing material comprises talc powder and mica, and the mass ratio of the talc powder to the mica ranges from 0.1 to 20.

Optionally, the modulus of the vibration plate is greater than or equal to 2 GPa.

Optionally, the vibration plate is formed by injection molding or vacuum forming.

Optionally, the vibrating plate is a single-layer vibrating plate, and the single-layer vibrating plate is made of the composite material;

or the vibration plate is a composite vibration plate, the composite vibration plate comprises at least two layers, and at least one layer of the composite vibration plate comprises the composite material.

Optionally, the thickness of the single-layer vibrating plate is in a range of 50 μm to 2800 μm.

According to a second aspect of embodiments of the present application, there is provided a sound generating apparatus, comprising a vibration system and a magnetic circuit system cooperating with the vibration system, wherein the vibration system comprises the vibration plate of the first aspect.

One technical effect of the embodiment of the application is as follows:

the embodiment of the application provides a vibrating plate for a sound generating device, at least part of the vibrating plate is made of a composite material, the composite material comprises a polymer matrix and a reinforcing material dispersed in the polymer matrix, the reinforcing material comprises at least one of talcum powder and mica, and the mass fraction range of the reinforcing material in the composite material is 10% -70%. The vibration board that this application embodiment provided at least part adopts combined material to make, combined material is through inciting somebody to action talcum powder and/or mica reinforcement material disperse in the polymer base, strengthened the modulus and the structural strength of vibration board can promote heat resistance, dimensional stability and the damping performance of vibration board for the vibration board has the frequency response scope of broad and lower distortion, and then can improve sound generating mechanism's vocal effect.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

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

FIG. 1 is a graph of mass fraction of a reinforcing material in the composite material versus modulus of a vibrating plate made from the composite material provided in an example of the present application;

fig. 2 is a schematic structural view of talc powder provided in an embodiment of the present application;

fig. 3 is a curve diagram showing the change of flexural modulus of the vibration plate made of the composite material of talc powder and mica in different mass ratios provided by the examples of the present application.

Detailed Description

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 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 application 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 application, 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 embodiment of the application provides a vibration board for a sound generating device, and the sound generating device can be a loudspeaker, the vibration board is at least partially made of composite material, the composite material comprises a polymer matrix and a reinforcing material dispersed in the polymer matrix, the reinforcing material comprises at least one of talcum powder and mica, and the mass fraction range of the reinforcing material in the composite material is 10% -70%. Preferably, the mass fraction of the reinforcing material in the composite material may range from 20% to 50%. The reinforcing material may be uniformly dispersed in the polymer matrix to improve the performance stability of the composite.

Specifically, the addition of the reinforcing materials such as talc powder and mica in the composite material can improve the processing fluidity of the polymer matrix, so that the reinforcing materials can be fully dispersed in the polymer matrix, the dispersion uniformity and the mass ratio of the reinforcing materials in the polymer matrix are improved, and the modulus and the structural strength of the vibrating plate are further ensured, wherein the modulus can be elastic modulus, specifically including flexural modulus, compressive modulus and shear modulus. Fig. 1 shows a graph of the mass fraction of the reinforcing material in the composite material as a function of the flexural modulus of the vibrating plate made from the composite material, from which it can be seen that the flexural modulus of the vibrating plate made from the composite material increases significantly as the mass fraction of the reinforcing material in the composite material increases. Particularly, mica is adopted as the reinforcing material, and the flexural modulus of the vibrating plate is increased from 3.6GPa to 12.3GPa in the process that the mass fraction of the reinforcing material in the composite material is increased from 10% to 50%; in the process that the mass fraction of the reinforcing material in the composite material is increased from 50% to 70%, the flexural modulus of the vibrating plate is improved, but the reinforcing effect of the reinforcing material is fully exerted, and the flexural modulus of the vibrating plate is not obviously improved. When the mass fraction of the reinforcing material in the composite material exceeds 70%, the melt index of the polymer matrix is reduced by excessive reinforcing material, so that the flowability of the polymer matrix is reduced, and the uniformity of the dispersion of the reinforcing material in the composite material is reduced.

The vibration board that this application embodiment provided at least part adopts combined material to make, combined material is through inciting somebody to action talcum powder and/or mica reinforcement material disperse in the polymer base member, strengthened the modulus and the structural strength of vibration board make the installation the sound generating mechanism of vibration board has the frequency response scope of broad and lower distortion, has improved sound generating mechanism's vocal effect.

Optionally, the polymer matrix comprises at least one of a polymer material such as polypropylene (PP), Polycarbonate (PC), Polyamide (PA), Polyoxymethylene (POM), polyphenylene oxide (PPO), Polyphenylene Sulfide (PPs), polyether ether ketone (PEEK), and Polyetherimide (PEI).

Specifically, the polymer material has chemical resistance, heat resistance, high-strength mechanical properties and good high-wear-resistance processability, and when the reinforcing material is dispersed in the polymer matrix, the reinforcing material needs to be uniformly dispersed in the polymer matrix in a molten state after the polymer matrix is melted, so that the dispersion of the reinforcing material is more uniform and sufficient due to the good flowing property of the polymer material, and the uniformity and the performance stability of the composite material are improved.

Optionally, the particle size of the talc powder is in the range of 0.3 μm to 100 μm, preferably, the particle size of the talc powder is in the range of 0.5 μm to 30 μm.

Specifically, talc is an aqueous magnesium silicate, which is a typical two-dimensional reinforcing material. The main component of the ceramic is 3MgO.4SiO₂.H₂O, formula Mg₃[SiO₁₀](OH)₂The theoretical chemical composition of the talcum powder is as follows: MgO 31.9%, SiO₂63.4％，H₂And 4.7 percent of O. The talcum powder has a silicon-oxygen layer composed of silicon-oxygen tetrahedron, and Mg is added between the upper and lower silicon-oxygen layers²⁺And OH^-And a hydrogen-oxygen layer is formed as shown in fig. 2. The talcum powder has good lamellar crystal structure, good lipophilicity, stable chemical property and good acid and alkali resistance. When the talcum powder is added into the polymer matrix, the talcum powder and the polymer matrix have good affinity, and can be well matched with the polymer matrix, so that the modulus of the composite material is obviously enhanced, and the strength, the rigidity and the impact resistance of the composite material are particularly enhanced.

Optionally, the mica comprises at least one of sericite, muscovite, phlogopite, lepidolite, and biotite.

Specifically, mica has the following chemical formula:

αβ_2-3γ_1-10δ₄O₁₀σ₂

wherein alpha represents interlayer cation (specifically including Cs, K, Na, NH)₄Rb, Ba and Ca); b represents an octahedrally coordinated cation (specifically including Li, Fe, Mg, Mn, Zn, Al, Cr, V, and Ti); gamma denotes vacancies, delta denotes Be, Al, B, Fe and Si plasma; σ represents Cl, F, OH, O, and S plasma.

Mica has two-dimensional reinforcing function, good elasticity, toughness, insulativity, high temperature resistance, acid and alkali resistance and strong adhesive force, and is an excellent additive. The composite material obtained by mica reinforced polymer matrix has excellent mechanical property, heat resistance, shrinkage resistance and other properties. Further, when the mica and the talcum powder are simultaneously used as two-dimensional reinforcing materials, the mica and the talcum powder have good compatibility, and the modulus and the structural strength of the composite material can be obviously enhanced by mixing the mica and the talcum powder.

Optionally, the reinforcing material comprises talc powder and mica, the mass ratio of talc powder to mica is in the range of 0.1-20, and preferably the mass ratio of talc powder to mica is in the range of 0.5-8.

Specifically, when mica and talc powder are used as two-dimensional reinforcing materials, the modulus and the structural strength of the composite material can be obviously enhanced, and the modulus and the structural strength of the vibrating plate prepared from the composite material are further improved, wherein the modulus can be elastic modulus, specifically including flexural modulus, compressive modulus and shear modulus. Figure 3 shows the curve of the variation of the flexural modulus of the vibrating plate made with the composite material, with different mass ratios of talc and mica. The mass fraction of the reinforcing material in the composite material is 18%, and it can be seen from the figure that when the mass ratio of the talcum powder to the mica in the reinforcing material is increased from 0 to about 4, the flexural modulus of the vibrating plate is increased from 5.7GPa to 12.3 GPa; when the mass ratio of the talcum powder to the mica in the reinforcing material is increased from 4 to about 10, the vibration plate still has higher flexural modulus, but the mass of the mica is too small, so that the toughness and the crosslinking property of the polymer matrix are reduced, and the flexural modulus of the vibration plate is gradually reduced, namely the flexural modulus is reduced from 12.3GPa to 6.1 GPa.

Alternatively, the modulus of the vibration plate is greater than or equal to 2GPa, preferably, the modulus of the vibration plate is greater than or equal to 3.2GPa, and the modulus may be an elastic modulus, specifically including a flexural modulus, a compressive modulus, and a shear modulus.

Specifically, the modulus of general plastics or rubbers is about 1GPa to 2GPa, which is insufficient to satisfy the vibration requirements of the vibrating plate. The reinforcing material is dispersed in the polymer matrix to form the composite material, and the vibrating plate obtained by adopting the composite material has higher modulus which can reach 3.2GPa or even higher. Table 1 shows the comparison between the parameters of the vibration plate provided in the embodiment of the present application and the parameters of the conventional vibration plate, in which the conventional vibration plate in table 1 is made of polypropylene (PP), and the vibration plate provided in the embodiment of the present application is reinforced by talc powder and/or mica, wherein the polymer matrix is PP. As can be seen from Table 1, the flexural modulus of the conventional vibrating plate is only 1.9GPa, and the specific modulus E/rho is 2.11; the flexural modulus of the vibration plate reinforced by the talcum powder provided by the embodiment of the application can reach 3.2GPa, and the specific modulus E/rho is 3.04; the bending modulus of the vibrating plate reinforced by the mica can reach 4.6GPa, and the specific modulus E/rho is 4.18; the flexural modulus of the vibration plate reinforced by the mixture of the talcum powder and the mica can even reach 5.3GPa, and the specific modulus E/rho is 4.82. That is to say, the vibration board flexural modulus through talcum powder or mica reinforcement is greater than traditional PP vibration board, and the vibration board flexural modulus through the compound reinforcing of talcum powder and mica is showing and is greater than traditional PP vibration board for the vibration board that this application embodiment provided has higher frequency response scope, and then can improve the sound production effect who installs the sound generating mechanism that this application embodiment provided the vibration board.

Table 1 comparison of parameters of the vibration plate provided in the examples of the present application with those of the conventional vibration plate

Optionally, the vibration plate is formed by injection molding or vacuum forming.

Specifically, in the injection molding process of the vibrating plate, the melting plasticization and the flow molding of the vibrating plate raw material can be respectively carried out in the charging barrel and the die cavity, and the die forming the die cavity can be always in a state that the raw material solution is rapidly cooled and molded, so that the molding cycle of the vibrating plate is greatly shortened. Meanwhile, on the premise of ensuring the good processing flowability of the raw materials, the die can be precisely processed to obtain a vibrating plate product with better dimensional stability. The plastic suction molding is to heat and soften the flat vibrating plate raw material, to be adsorbed on the surface of the mold by vacuum, and then to be cooled and molded. The production cycle of the one-step forming of the plastic suction forming is between 5s and 20s, so that the production efficiency of the vibrating plate can be greatly improved, and the production cost is reduced.

Optionally, the vibrating plate is a single-layer vibrating plate, and the single-layer vibrating plate is made of the composite material;

or the vibration plate is a composite vibration plate, the composite vibration plate comprises at least two layers, and at least one layer of the composite vibration plate comprises the composite material.

Specifically, when the vibrating plate is a single-layer vibrating plate, the single-layer vibrating plate may be made of the composite material to ensure the modulus and structural strength of the single-layer vibrating plate. When the vibrating plate is a composite vibrating plate, namely the vibrating plate comprises a plurality of layers, one layer can be made of the composite material, and the other layers are made of polymer materials such as plastics or rubber; for example, when the number of layers of the vibrating plate is greater than two, the two layers made of the composite material can be positioned on the inner side and the outer side of the vibrating plate, and then other layers are sandwiched between the two layers, so that the strength of the inner layer and the outer layer of the vibrating plate is enhanced. In addition, when the vibrating plate comprises a plurality of layers, the layers can be compositely bonded by adopting glue layers, so that the aim of fixing the vibrating plate structure is fulfilled.

Optionally, the thickness of the single-layer vibrating plate is in a range of 50 μm to 2800 μm. Preferably, the thickness of the single-layer vibrating plate ranges from 100 μm to 2000 μm. Specifically, when the thickness of the single-layer vibrating plate is too low, the modulus and the structural strength of the single-layer vibrating plate are low, and the vibration requirement of the sound generating device transmitted by the vibrating diaphragm is difficult to meet; when the thickness of the single-layer vibrating plate is too high, although the modulus and the structural strength of the single-layer vibrating plate are large enough, the single-layer vibrating plate is difficult to deform when receiving a vibration signal, so that the vibration transmitted by the vibrating diaphragm cannot be transmitted, and the sound production effect of the sound production device is influenced.

The embodiment of the application also provides a sound generating device, including vibration system and with the magnetic circuit that vibration system mutually supported, vibration system include the vibration board.

Specifically, the vibration plate is made of a composite material, and the composite material disperses the reinforcing material in the polymer matrix, so that the modulus and the structural strength of the vibration plate are enhanced, the sound generating device has a wider frequency response range and lower distortion, and the sound generating effect of the sound generating device is improved.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. 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 present application. The scope of the application is defined by the appended claims.