CN112770231A - Vibrating plate for sound production device and sound production device - Google Patents
Vibrating plate for sound production device and sound production device Download PDFInfo
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- CN112770231A CN112770231A CN202011520843.6A CN202011520843A CN112770231A CN 112770231 A CN112770231 A CN 112770231A CN 202011520843 A CN202011520843 A CN 202011520843A CN 112770231 A CN112770231 A CN 112770231A
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- vibrating plate
- aramid
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
The embodiment of the application provides a vibrating plate for a sound generating device and the sound generating device, wherein the vibrating plate comprises an aramid fiber film, and under the condition that the vibrating plate is a single-layer vibrating plate, the single-layer vibrating plate is made of the aramid fiber film; or, when the vibrating plate is a composite vibrating plate, the composite vibrating plate comprises at least two layers, and at least one layer of the composite vibrating plate comprises the aramid film. The embodiment of the application provides the vibration board is the partial adoption at least aramid fiber film, aramid fiber film's high strength can be in guaranteeing on aramid fiber film structural stability's the basis, reduce aramid fiber film's thickness size promotes and has vibration board's sound generating mechanism's well high frequency sensitivity.
Description
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.
Common vibrating plates are generally formed by hot-pressing high Polymer such as plastic or rubber into a convex hull structure, for example, a conventional vibrating plate is gradually replaced by an LCP (Liquid Crystal Polymer) vibrating plate from a PET (polyethylene terephthalate) vibrating plate and a PEN (polyethylene naphthalate) vibrating plate, and the LCP vibrating plate has a higher modulus relative to the PET vibrating plate, and can improve the high-frequency sound production performance of the sound production device to a certain extent. However, the LCP material has orientation, and the ratio of the longitudinal modulus to the transverse modulus of the LCP material reaches 1.5-2.5, so that the LCP vibrating plate may be slightly deformed during the forming process, and in the process of vibrating the vibrating diaphragm at high frequency, the vibrating plate may be polarized due to the anisotropy of the LCP vibrating plate, which affects the high-frequency sound quality and the service life of the speaker.
Disclosure of Invention
An object of the embodiment of the present application is to provide a novel technical solution for a vibration plate of a sound generating device and the sound generating device.
According to a first aspect of embodiments of the present application, there is provided a vibration plate for a sound emitting device, including an aramid film;
the vibrating plate is a single-layer vibrating plate, and the single-layer vibrating plate is made of the aramid fiber film;
or, the vibrating plate is a composite vibrating plate, the composite vibrating plate comprises at least two layers, and at least one layer of the composite vibrating plate comprises the aramid fiber film.
Optionally, the aramid film has a thickness in a range of 4 μm to 100 μm.
Optionally, the aramid film has a flexural strength greater than or equal to 200 MPa.
Optionally, the aramid film has a modulus of greater than or equal to 8 GPa.
Optionally, the raw material for molding the aramid fiber film includes at least one of para-aramid, meta-aramid, and heterocyclic aromatic polyamide.
Optionally, the aramid fiber film is formed by one of extrusion molding, injection molding and tape casting.
Optionally, the vibrating plate is of a flat plate structure or a convex hull structure.
Optionally, the vibration plate is manufactured by a hot press forming process, and the forming temperature of the vibration plate is greater than 140 ℃.
Optionally, the thickness of the vibrating plate is in a range of 4 μm to 500 μm.
Optionally, the vibrating plate includes two outer layers and a middle layer disposed between the two outer layers, the outer layers are made of the aramid film, and the middle layer is a foam material layer.
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, which comprises an aramid fiber film, wherein the aramid fiber film is adopted to manufacture the single-layer vibrating plate under the condition that the vibrating plate is a single-layer vibrating plate; or, when the vibrating plate is a composite vibrating plate, the composite vibrating plate comprises at least two layers, and at least one layer of the composite vibrating plate comprises the aramid film. The embodiment of the application provides the vibration board is the partial adoption at least aramid fiber film, aramid fiber film's high strength can be in guaranteeing on aramid fiber film structural stability's the basis, reduce the thickness size of vibration board promotes and has the sound generating mechanism's of vibration board well high frequency sensitivity.
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 schematic structural diagram of a vibration plate for a sound generating device according to an embodiment of the present disclosure;
fig. 2 is an infrared spectrum of a para-aramid raw material of a vibrating plate provided in an embodiment of the present application;
fig. 3 is a graph comparing curves of a sound generating device FR having a vibration plate provided in an embodiment of the present application and a conventional vibration plate;
fig. 4 is a comparison graph of THD test curves of a sound generating device having a vibration plate provided in an embodiment of the present application and a conventional vibration plate;
fig. 5 is a graph comparing bending resistance curves of a vibration plate provided by an embodiment of the present application and a conventional vibration plate at different thicknesses.
Wherein: 1-aramid fiber film; 2-foaming material.
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.
Referring to fig. 1, the present embodiment provides a vibration plate for a sound generating device, including an aramid film 1.
The vibrating plate can be a single-layer vibrating plate or a composite vibrating plate formed by laminating a plurality of layers, and when the vibrating plate is a single-layer vibrating plate, the single-layer vibrating plate is made of the aramid fiber film 1; or, under the condition that the vibration plate is a composite vibration plate, the composite vibration plate comprises at least two layers, at least one layer of the composite vibration plate comprises the aramid fiber film 1, namely at least two layers of the composite vibration plate can be made of the aramid fiber film 1 on each layer, or a part of the layers can be made of the aramid fiber film 1, and the rest layers are made of the foaming material 2.
The thickness of the aramid fiber film 1 ranges from 4 μm to 100 μm, and preferably, the thickness of the aramid fiber film 1 ranges from 10 μm to 50 μm.
Specifically, referring to fig. 1, the vibrating plate includes two outer skin layers made of the aramid film 1 and an intermediate layer disposed between the two outer skin layers, that is, the intermediate layer is made of the foamed material 2. The structural strength of the two outer skin layers is high, so that the structural stability of the vibrating plate can be ensured, and the foam material layer serves as an intermediate layer, so that the weight of the vibrating plate can be reduced by virtue of the low density of the foam material 2, and the weight of the vibrating plate is reduced.
Specifically, the aramid film 1 may be made of aramid resin or modified aramid polymer, for example, the molding raw material of the aramid film 1 may include at least one of aramid resin such as para-aramid and meta-aramid, and modified aramid polymer such as heterocyclic aromatic polyamide, and the molecular formula of the para-aramid is as follows:
wherein Xm and Yn are groups used for substituting hydrogen on the benzene ring of the para-aramid, and specifically can be methyl, ethyl and other groups.
Specifically, the infrared spectrum of the para-aramid structure is shown in FIG. 2, and as can be seen from FIG. 2, the infrared spectrum of the para-aramid structure is 3268cm-1Has an N-H stretching vibration absorption peak at 1599cm-1And 1498cm-1The peak of stretching vibration of the carbon skeleton appears at 1651cm-1A stretching vibration peak of C ═ O appears, and the amide bond in the para-aramid fiber is verified; at the same time, at 1498cm-1Has a skeleton absorption peak of benzene ring at 690cm-1Has strong absorption peak of C-H out-of-plane bending on benzene ring at 2900cm-1An absorption peak of an unsaturated carbon-hydrogen bond is nearby, and a benzene ring structure in the para-aramid is verified.
Specifically, the foaming material 2 may be a foaming material such as PMI (polymethacrylimide) foam, PET (polyethylene terephthalate) foam, or the like, and the foaming material 2 may be bonded to the aramid film 1 after being formed into a partial layer of the composite diaphragm; in addition, the foam material 2 may also be a foam adhesive film, such as an EVA (ethylene vinyl acetate copolymer) foam adhesive film, a TPU (thermoplastic polyurethane elastomer rubber) foam adhesive film, or a PA (polyamide, commonly referred to as nylon) foam adhesive film, and the foam adhesive film may be directly attached to the surface of the aramid fiber film 1 to form the composite vibration plate. Since the aramid film 1 has high modulus and rigidity, and the hydrogen on the benzene ring of the main chain of the aramid film 1 is replaced by Xm and Yn, the structural strength and the dimensional stability of the composite vibration plate can be improved, and the moisture absorption rate of the composite vibration plate can be reduced.
Moreover, aramid fiber film 1's high strength can be guaranteed on the basis of 1 structural stability of aramid fiber film, effective control aramid fiber film 1's thickness size, also reduced 1 weight of aramid fiber film promptly, make the vibration board has higher modulus and lower weight, has promoted to have the sound generating mechanism's of vibration board well high frequency sensitivity. In addition, the aramid fiber film 1 has high internal damping, so that the distortion of the sound generating device with the vibrating plate is smaller, and the hearing sense is clearer and more vivid. When the thickness of the aramid fiber film 1 is too small, the strength of the aramid fiber film 1 is weak, and frequent vibration cannot be borne; when the thickness of the aramid fiber film 1 is too large, the weight of the aramid fiber film 1 is increased, and the heavier mass affects the medium-high frequency sensitivity of the sound generating device with the vibrating plate.
More importantly, the embodiment of the application provides aramid fiber film 1 compares in traditional aramid fiber, the thickness homogeneity of aramid fiber film 1 after the film-forming is good for aramid fiber film 1 has isotropic advantage and better stability, has avoided aramid fiber's preimpregnation and the compound technological process of multilayer. The single-layer aramid fiber film 1 can realize the stable forming of the vibration plate, the weight of the vibration plate is reduced, the vibration space of the sound generating device with the vibration plate is saved, and the medium-high frequency sensitivity of the sound generating device with the vibration plate is improved.
The embodiment of the application provides the vibration board is the partial adoption at least aramid fiber film 1, aramid fiber film 1's high strength can be in guaranteeing on the basis of 1 structural stability of aramid fiber film, reduce aramid fiber film 1's thickness dimension promotes and has vibration board's sound generating mechanism's well high frequency sensitivity.
Optionally, the flexural strength of the aramid film 1 is greater than or equal to 200 MPa.
Specifically, because aramid film 1 has better bending strength, makes the vibration board is difficult for producing bending deformation when the medium-high frequency vibrates, has the FR (frequency response) curve of the sound generating mechanism of vibration board is more level and smooth, has improved this sound generating mechanism's sensitivity and sound producing effect on the basis of having guaranteed this sound generating mechanism's structural strength and life. In addition, the bending strength of the aramid film 1 can be measured by preparing an aramid film sample under the condition of 23 ℃ with the test standard of the bending strength and then testing the bending strength of the aramid film sample.
In a specific embodiment, fig. 3 is a graph comparing FR curves of a sound generating device having a vibrating plate provided in an embodiment of the present application and a vibrating plate made of a conventional material, wherein the vibrating plate provided in the embodiment of the present application is a single-layer aramid film vibrating plate, and has a convex hull shape and a thickness of 50 μm, and the conventional vibrating plate is made of LCP (Liquid Crystal Polymer ) and has a convex hull shape and a thickness of 50 μm. As can be seen from fig. 3, the curve of the sound generating device FR having the vibrating plate according to the embodiment of the present application is smoother, that is, the sound generating device having the vibrating plate according to the embodiment of the present application has good high-frequency sound generating quality.
Alternatively, the modulus of the aramid film 1 is greater than or equal to 8GPa, the modulus can be elastic modulus, specifically comprises flexural modulus, compressive modulus and shear modulus, and the specific modulus of the aramid film 1 is greater than or equal to 5.7 GPa/(g/cm)3)。
Specifically, the modulus of general plastics or rubber is approximately 1GPa-2GPa, which is not enough to meet the vibration requirement of the vibrating plate. The aramid fiber film 1 has high modulus which can reach 8GPa or even higher, so that the vibrating plate obtained by the aramid fiber film 1 has high elastic modulus. The modulus of vibration board is when increasing, and the acoustic high frequency resonance peak of the sound generating mechanism who installs this vibration board can take place the lag for this sound generating mechanism's frequency response curve flatness and frequency loudness increase, this sound generating mechanism can obtain higher high frequency sound quality, has further verified in figure 3 that the vibration board that this application embodiment provided can improve sound generating mechanism's sound quality.
In a specific embodiment, fig. 5 is a graph comparing bending resistance curves of a vibrating plate provided in examples of the present application with a conventional vibrating plate at different thicknesses, and the bending resistance of the vibrating plate is related to the elastic modulus and the thickness thereof as follows:
bending resistance (elastic modulus) thickness
In fig. 5, the vibrating plate provided by the embodiment of the present application is a single-layer aramid film vibrating plate, and is in a flat plate shape, the thickness variation of the single-layer aramid film vibrating plate is specifically from 2.5 μm to 10 μm, the conventional vibrating plate includes a PET (polyethylene terephthalate) vibrating plate and a PI (polyimide) vibrating plate, which are both in a flat plate shape, the thickness variation of the PET is specifically from 2.5 μm to 12.5 μm, the thickness variation of the PI vibrating plate is specifically from 9 μm to 12.5 μm, and the bending resistance of the PI vibrating plate with the thickness of 12.5 μm is taken as a reference. It can be seen from fig. 5 that the bending resistance of the single-layer aramid film vibrating plate provided by the embodiment of the application is obviously higher than that of the conventional PET vibrating plate and PI vibrating plate with the same thickness, so that the sound generating device with the vibrating plate provided by the embodiment of the application has good sound generating quality.
Optionally, the aramid fiber film 1 is formed by one of extrusion molding, injection molding and casting molding.
Specifically, the aramid fiber film 1 may be formed by heating and melting at least one of para-aramid fiber, meta-aramid fiber, and heterocyclic aromatic polyamide, and extruding, injection molding, or casting the melted raw material to obtain the aramid fiber film 1 having a certain thickness and size.
In addition, because the aramid fiber film 1 has good temperature resistance, the aramid fiber film 1 can adopt a hot press molding process in the extrusion molding process, specifically, the molding temperature is controlled within the range of more than or equal to 140 ℃, so as to ensure the molding size and the molding efficiency of the aramid fiber film 1.
Optionally, the vibrating plate is of a flat plate structure or a convex hull structure.
Specifically, the aramid fiber film 1 may be formed into a flat-plate-structured diaphragm directly after film formation, or may be formed into a diaphragm after being laminated with the foam material 2 having a layered structure. In order to improve the sound emission strength and the sound emission directivity of the sound emission device having the vibration plate, the vibration plate may have a convex hull structure. Because the aramid fiber film 1 has good film-forming thickness uniformity, the aramid fiber film 1 has the advantage of isotropy and better stability, and the structural stability of the vibrating plate with the convex hull structure is ensured.
In a specific embodiment, fig. 4 is a THD (harmonic distortion) test curve of a sound generating device having a vibration plate provided in an embodiment of the present application and a conventional vibration plate, wherein the vibration plate provided in the embodiment of the present application is a single-layer aramid film vibration plate, and has a convex hull shape and a thickness of 50 μm, and the conventional vibration plate is made of LCP (Liquid Crystal Polymer ) and has a convex hull shape and a thickness of 50 μm. As can be seen from fig. 4, the sound generating device mounted with the vibration plate of the embodiment of the present application has a lower THD (harmonic distortion) than the sound generating device mounted with the conventional LCP vibration plate, which indicates that the vibration plate provided by the embodiment of the present application has a better polarization resistance and enables the sound quality of the sound generating device having the vibration plate to be better.
Optionally, the thickness of the vibrating plate is in the range of 4 μm to 500 μm, preferably in the range of 20 μm to 300 μm.
Specifically, when the thickness of the vibrating plate is too low, the modulus and the structural strength of the vibrating plate are low, and the structure is damaged in the vibrating process; when the thickness of the vibrating plate is too high, although the modulus and the structural strength of the vibrating plate are sufficiently large, the sound production sensitivity of the sound production device is affected by the too large weight of the vibrating plate, and thus the sound production effect of the sound production device is affected. Therefore, when the thickness of the vibrating plate is controlled within the range of 4-500 μm, the structural strength and the vibration sensitivity of the vibrating plate can be considered, and the sound production effect of the sound production device can be ensured.
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, sound generating mechanism can be sound generating mechanism such as speaker or receiver, the at least part of vibration board adopts aramid fiber film 1 makes, has strengthened the modulus and the structural strength of vibration board make sound generating mechanism has broad frequency response scope and lower distortion, has improved sound generating mechanism's sound producing effect.
Optionally, the vibration system includes a ring-shaped diaphragm, a hollow area is formed in the middle of the ring-shaped diaphragm, and the vibration plate is connected to the hollow area of the ring-shaped diaphragm.
Specifically, the material of the annular diaphragm may include at least one of engineering plastics, an elastomer material, or an adhesive film, where the engineering plastics may specifically be PEEK (polyether ether ketone) or PAR (polyarylate), the elastomer material may specifically be TPU (thermoplastic polyurethane elastomer), TPEE (polyester rubber), or silicone rubber, and the adhesive film may specifically be an acrylate adhesive or a silicone adhesive. The thickness of the annular vibrating diaphragm is within the range of 0.02mm-0.5mm, the annular vibrating diaphragm and the vibrating plate can be bonded through an adhesive or a double-sided adhesive tape, and the connection convenience between the annular vibrating diaphragm and the vibrating plate is ensured, and meanwhile, the connection strength between the annular vibrating diaphragm and the vibrating plate 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.
Claims (11)
1. A vibrating plate for a sound production device is characterized by comprising an aramid fiber film;
the vibrating plate is a single-layer vibrating plate, and the single-layer vibrating plate is made of the aramid fiber film;
or, the vibrating plate is a composite vibrating plate, the composite vibrating plate comprises at least two layers, and at least one layer of the composite vibrating plate comprises the aramid fiber film.
2. A vibrating plate according to claim 1, wherein a thickness of the single layer of the aramid film is in a range of 4 μm to 100 μm.
3. A vibrating plate according to claim 1, wherein the bending strength of the aramid film is 200MPa or more.
4. A vibrating plate according to claim 1, wherein the modulus of the aramid film is 8GPa or more.
5. A vibration plate according to claim 1, wherein the molding raw material of the aramid film comprises at least one of para-aramid, meta-aramid, and heterocyclic aromatic polyamide.
6. A diaphragm according to claim 1, wherein the aramid film is formed by one of extrusion molding, injection molding and casting.
7. A vibration plate according to claim 1, wherein the vibration plate is of a flat plate structure or a convex hull structure.
8. The vibrating plate of claim 7, wherein the vibrating plate is manufactured using a hot press forming process, and a forming temperature of the vibrating plate is greater than 140 ℃.
9. A vibrating plate according to claim 7, wherein the thickness of the vibrating plate is in the range of 4 μm to 500 μm.
10. A vibrating plate according to claim 1, wherein the vibrating plate comprises two outer skin layers and an intermediate layer provided between the two outer skin layers, the outer skin layers being made of the aramid film, the intermediate layer being a foamed material layer.
11. 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 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011520843.6A CN112770231A (en) | 2020-12-21 | 2020-12-21 | Vibrating plate for sound production device and sound production device |
| PCT/CN2021/135706 WO2022135124A1 (en) | 2020-12-21 | 2021-12-06 | Vibration plate for sound production device, and sound production device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011520843.6A CN112770231A (en) | 2020-12-21 | 2020-12-21 | Vibrating plate for sound production device and sound production device |
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| CN112770231A true CN112770231A (en) | 2021-05-07 |
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| CN202011520843.6A Pending CN112770231A (en) | 2020-12-21 | 2020-12-21 | Vibrating plate for sound production device and sound production device |
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| WO (1) | WO2022135124A1 (en) |
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| WO2022135124A1 (en) * | 2020-12-21 | 2022-06-30 | 歌尔股份有限公司 | Vibration plate for sound production device, and sound production device |
| CN116065403A (en) * | 2021-10-29 | 2023-05-05 | 歌尔股份有限公司 | Vibrating diaphragm of sound generating device, manufacturing method of vibrating diaphragm and sound generating device |
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| WO2022135124A1 (en) * | 2020-12-21 | 2022-06-30 | 歌尔股份有限公司 | Vibration plate for sound production device, and sound production device |
| CN116065403A (en) * | 2021-10-29 | 2023-05-05 | 歌尔股份有限公司 | Vibrating diaphragm of sound generating device, manufacturing method of vibrating diaphragm and sound generating device |
| CN116065403B (en) * | 2021-10-29 | 2025-01-07 | 歌尔股份有限公司 | Vibrating diaphragm of sound generating device, manufacturing method of vibrating diaphragm and sound generating device |
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| Publication number | Publication date |
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| WO2022135124A1 (en) | 2022-06-30 |
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Application publication date: 20210507 |