CN116132889A - Vibrating diaphragm, sound generating device and electronic equipment - Google Patents

Abstract

The invention discloses a vibrating diaphragm, a sound generating device and electronic equipment, wherein the vibrating diaphragm comprises a main body part and a conductive part, the main body part comprises a rubber material layer, the conductive part is arranged on the rubber material layer, at least a part of the conductive part is exposed out of the main body part to be electrically connected with a voice coil and an external circuit, the conductive part comprises a matrix and conductive particles dispersed in the matrix, and the matrix consists of a hybrid chain polymer with-NH-COO-characteristic groups. The substrate of the conductive part of the vibrating diaphragm contains the hybrid chain polymer with the-NH-COO-characteristic group, so that the conductive part and the main body part have good adhesive force, the bonding force between the substrate and the conductive particles can be enhanced, the consistency of the vibrating diaphragm in the stretching process is ensured, the good rebound resilience of the vibrating diaphragm is realized, and the stability of sound quality of the vibrating diaphragm in the long-term use process is ensured.

Description

Vibrating diaphragm, sound generating device and electronic equipment

Technical Field

The invention relates to the technical field of electroacoustic, in particular to a vibrating diaphragm of a sound generating device, the sound generating device using the vibrating diaphragm and electronic equipment using the sound generating device.

Background

The sound generating device generally includes a diaphragm and a voice coil coupled to one side of the diaphragm, and an electrical connector electrically connecting an internal circuit of the sound generating device to an external circuit. The voice coil comprises two voice coil leads, the two voice coil leads are respectively and electrically connected with two bonding pads of the electric connecting piece in a spot welding mode, and the electric connecting piece is electrically connected with an external circuit at the same time so as to control electric signals in the voice coil through electric signals of a terminal product. Generally, the lead wire of the voice coil needs to be led out of a thread with a certain length, and is suspended to realize electrical connection with the electrical connector. Although higher sensitivity can be realized in unsettled lead wire structure, because the unsettled restriction of lead wire, the amplitude of voice coil loudspeaker voice coil can not be too big, and the broken wire risk is higher, and the low frequency effect is not showing enough, can not provide better hearing experience for the user.

In the existing products, some sound generating devices further comprise a centering support piece, wherein the centering support piece is usually combined on one side of the vibrating diaphragm, and the centering support piece can be used as an electric connecting piece between the voice coil and the outside. Specifically, the lead wire of the voice coil is connected with the centering support, and the centering support is connected with an external circuit, so that the electric connection is realized. In fact, although the hidden danger of broken voice coil leads is effectively solved by the application of the centering support piece, the existence of the centering support piece occupies the inner space of the sounding device, so that the acoustic performance of a product is lost to a certain extent, and the audio experience of a user is reduced. Moreover, since the centering support needs to be connected with the diaphragm/voice coil, the consistency of the vibration system is affected, and large-amplitude vibration cannot be realized. In addition, the centering support piece has higher hardness relative to the vibrating diaphragm material, thereby influencing the rebound resilience performance of the vibrating diaphragm.

Disclosure of Invention

An object of the present invention is to provide a diaphragm having the advantages of high rebound resilience and good consistency of vibration.

Still another object of the present invention is to provide a sound generating apparatus comprising the above-mentioned diaphragm.

Still another object of the present invention is to provide an electronic apparatus comprising the above sound emitting device.

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

The vibrating diaphragm according to the embodiment of the first aspect of the invention comprises a main body part and a conductive part, wherein the main body part comprises a rubber material layer, the conductive part is arranged on the rubber material layer, at least one part of the conductive part is exposed out of the main body part to be electrically connected with a voice coil and an external circuit, the conductive part comprises a matrix and conductive particles dispersed in the matrix, and the matrix is composed of a hybrid polymer with-NH-COO-characteristic groups.

According to the vibrating diaphragm provided by the embodiment of the first aspect of the invention, the vibrating diaphragm adopts the combination of the main body part and the conductive part, so that not only is the electric connection between the voice coil and an external circuit realized, but also the problems that the internal space is lost and the lead wire is easy to break due to connecting pieces such as the centering support piece and the like are avoided. In addition, the matrix of the conductive part contains a hetero-chain polymer with-NH-COO-characteristic groups, and the main body part is made of rubber materials, so that the conductive part and the main body part have good adhesive force, the binding force between the matrix and conductive particles can be enhanced, the consistency of the vibrating diaphragm in the stretching process is ensured, the good rebound resilience of the vibrating diaphragm is realized, and the stability of sound quality of the vibrating diaphragm in the long-term use process is ensured. The vibrating diaphragm is suitable for a sound generating device with requirements of large displacement and high rebound (such as high loudness, deep water resistance and the like).

According to some embodiments of the invention, the thickness of the diaphragm is 30 μm to 200 μm, and the thickness of the conductive portion is 0.5 μm to 50 μm.

According to some embodiments of the invention, the portion of the main body portion opposite to the conductive portion and the conductive portion are formed together into a composite portion, the composite portion has no delamination between the conductive portion and the main body portion when the tensile strain is 20%, and the elastic recovery rate of the composite portion is greater than 70%.

According to some embodiments of the invention, the hybrid polymer of the conductive portion comprises at least one of polyurethane, polyurethane acrylate copolymer, epoxy modified polyurethane, polyurethane modified epoxy, and the like.

According to some embodiments of the invention, the rubber material of the body portion is a carbon chain polymer, the body portion comprising at least one of nitrile rubber, hydrogenated nitrile rubber, acrylate rubber, urethane rubber, ethylene acrylate rubber, ethylene propylene diene monomer rubber, and the like.

According to some embodiments of the invention, the conductive particles have a particle size of no greater than 20 μm; and/or the conductive particles include at least one of metal particles and carbonaceous particles.

According to some embodiments of the invention, the content of the conductive particles in the conductive part is not less than 50% wt and not more than 95% wt.

According to some embodiments of the invention, a portion of the conductive portion is embedded in the rubber material layer; or, the conductive part is arranged on the outer surface of the main body part.

According to some embodiments of the invention, the plurality of conductive portions are spaced apart, and the plurality of conductive portions are located on the same side or opposite sides of the main body portion.

According to some embodiments of the invention, the main body portion includes a folded ring portion, an outer edge portion disposed outside the folded ring portion, and an inner edge portion disposed inside the folded ring portion, and the conductive portion is disposed on the folded ring portion and the inner and outer edge portions.

According to some embodiments of the invention, the conductive portion includes a first electrical connection portion at the inner edge portion and a second electrical connection portion at the outer edge portion, the first electrical connection portion being electrically connected to the voice coil, the second electrical connection portion being electrically connected to the external circuit.

According to some embodiments of the invention, the conductive part further includes a third electrical connection part disposed on the folded ring part, and the first electrical connection part, the second electrical connection part and the third electrical connection part are exposed on the outer surface of the main body part.

According to some embodiments of the invention, the main body portion is formed as a single-layer structure composed of the rubber material layer; or, the main body part is formed into a multi-layer composite structure, the main body part comprises a rubber material layer and a damping layer which are arranged in a stacked manner, the rubber material layer is positioned on the outermost layer of the main body part, and the damping layer comprises at least one of acrylic pressure-sensitive adhesive, organic silicon pressure-sensitive adhesive and polyurethane.

An acoustic device according to an embodiment of the second aspect of the present invention includes a diaphragm according to any of the above embodiments.

An electronic device according to an embodiment of the third aspect of the present invention comprises any of the above-described sound generating means.

Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, 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 partial cross-sectional view of a diaphragm according to one embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of a diaphragm according to yet another embodiment of the present invention;

FIG. 3 is a top view of a sound emitting device according to one embodiment of the present invention;

FIG. 4 is a schematic structural view of a sound emitting device according to still another embodiment of the present invention;

FIG. 5 is a partial cross-sectional view of a sound emitting device according to one embodiment of the present invention;

FIG. 6 is a partial cross-sectional view of a sound emitting device according to another embodiment of the present invention;

FIG. 7 is a graph comparing frequency response curves of comparative example and example 3 according to the present invention;

fig. 8 is a graph showing a comparison of the total harmonic distortion curves according to the comparative example of the present invention and example 3.

Reference numerals

A diaphragm 10;

a main body 11; a folded ring portion 111; an outer edge portion 112; an inner edge portion 113; a layer of rubber material 114; a damping layer 115;

a conductive portion 12; a base 121; conductive particles 122;

a voice coil 20; a first diaphragm 21; the second diaphragm 22.

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, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to one 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 specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

A diaphragm 10 according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, a diaphragm 10 according to an embodiment of the present invention includes a main body 11 and a conductive portion 12, wherein the main body 11 includes a rubber material layer 114, the conductive portion 12 is disposed on the rubber material layer 114, and at least a portion of the conductive portion 12 is exposed to the main body 11 to be electrically connected with a voice coil 20 and an external circuit, the conductive portion 12 includes a matrix 121 and conductive particles 122 dispersed in the matrix 121, and the matrix 121 is composed of a hybrid polymer having-NH-COO-characteristic groups.

In other words, the diaphragm 10 according to the embodiment of the present invention is mainly composed of the main body 11 and the conductive portion 12, wherein the main body 11 may be a main body structure, and the main body 11 includes the rubber material layer 114 and may be made of a rubber material. Since the rubber material is superior to the conventional thermoplastic material (for example PEEK, TPU, TPEE, etc.), and has a lower modulus, that is, the rubber material has not only good high temperature resistance, weather resistance and high elasticity, but also a relatively low modulus, and can realize a large displacement due to vibration, the diaphragm 10 of the main body 11 using the rubber material layer 114 can obtain a higher loudness, and can meet the requirements of high power, high temperature resistance, etc. of the sound generating device product, so that the sound generating device has a higher loudness, sensitivity and waterproof effect.

Since the conductive portion 12 includes the base 121 and the conductive particles 122, the conductive portion 12 has conductive properties, and can realize circuit conduction. Specifically, at least a part of the surface of the conductive part 12 may be exposed on the surface of the main body 11 and electrically connected with the voice coil 20 and an external circuit, so as to solve the problems of loss of internal vibration space caused by connectors such as a centering support sheet in the prior art, easy breakage of a lead wire of the voice coil 20, and the like. Therefore, at least one surface of the conductive part 12 is exposed on the surface of the main body part 11, the circuit connection operation is simple, meanwhile, the conductive particles 122 can be protected to a certain extent due to the existence of the matrix 121 of the conductive part 12, and the conductive part 12 has better oxidation resistance, corrosion resistance and other performances. In addition, by adopting the combination of the matrix 121 and the conductive particles 122, the invention has strong combination capability with the rubber material of the main body 11, which is beneficial to the vibration consistency of the vibrating diaphragm 10 during working, compared with the pure conductor or the surface coating or plating and other schemes.

In addition, the matrix 121 of the conductive portion 12 may be used as a binder between the conductive particles 122, and the matrix 121 includes a hybrid polymer with-NH-COO-characteristic groups, where the hybrid polymer contains atoms other than carbon atoms in the main chain, so that the conductive portion 12 material has relatively high polarity and relatively good toughness. the-NH-COO-feature group is selected as the hetero-chain polymer in the conductive part 12, and because the-NH-COO-feature group has stronger polarity, the bonding force between the hetero-chain polymer and the conductive particles 122 can be enhanced, the obtained vibrating diaphragm 10 has higher flexibility and better vibration consistency, and the requirements of large displacement, high loudness, high sensitivity and the like of the sound generating device product can be met.

That is, the matrix 121 in the conductive portion 12 is made of a hybrid polymer having-NH-COO-characteristic groups, so that a better bonding effect between the matrix 121 and the conductive particles 122 in the conductive portion 12 can be achieved, the interaction force between the matrix 121 and the conductive particles 122 can be increased, and consistency in vibration and stability in conductivity can be ensured. Specifically, when the diaphragm 10 vibrates in a high temperature state, since the matrix 121 of the conductive portion 12 includes the hybrid polymer having the-NH-COO-characteristic group, the hybrid polymer in the matrix 121 may perform a good ligament function, and may connect the conductive particles 122 into a whole, thereby achieving uniform arrangement of the conductive particles 122 and simultaneously ensuring conductive uniformity and stability of the conductive portion 12.

Thus, the diaphragm 10 according to the embodiment of the present invention adopts the combination of the main body 11 and the conductive part 12, not only realizes the electrical connection between the voice coil 20 and the external circuit, but also avoids the problems of the loss of the internal space and the easy breakage of the leads caused by the connection members such as the centering support. In addition, the base 121 of the conductive part 12 contains a hybrid polymer with-NH-COO-characteristic groups, and the main body part 11 is made of rubber materials, so that the conductive part 12 and the main body part 11 have good adhesive force, the bonding force between the base 121 and the conductive particles 122 can be enhanced, the consistency of the diaphragm 10 in the stretching process is ensured, the good rebound resilience of the diaphragm 10 is realized, and the stability of the sound quality of the diaphragm 10 in the long-term use process is ensured. The diaphragm 10 is suitable for sound emitting devices with large displacement, high rebound (e.g., high loudness, deep water resistance, etc.) requirements.

According to an embodiment of the present invention, the thickness of the diaphragm 10 is 30 μm to 200 μm, and the rigidity and conductivity of the conductive portion 12 can be ensured. Since the main body 11 is made of rubber, the modulus of the main body 11 is generally lower than 100MPa, and in this embodiment, the diaphragm 10 is advantageously provided with a suitable resonance frequency by controlling the thickness of the diaphragm 10 to be 30 μm to 200 μm.

Further, since the conductive portion 12 is exposed to one surface of the main body portion 11 as a part of the vibration of the diaphragm 10, the rigidity of the conductive portion 12 is liable to have an influence on the compliance of the diaphragm 10. If the thickness of the conductive portion 12 is too thick, although the conductivity of the conductive portion 12 is high, the rigidity of the conductive portion 12 is too great, so that the consistency of vibration of the diaphragm 10 is liable to deteriorate, and further, the tensile deformation of the diaphragm 10 is restricted. If the thickness of the conductive portion 12 is too thin, it is easily limited to a processing process, and it is difficult to effectively secure the uniformity and uniformity of the thickness of the diaphragm 10, thereby leading to unstable conductivity of the conductive portion 12, and also being liable to crack during vibration of the diaphragm 10, causing a risk of an increase in resistance.

Further, since the main body 11 of the diaphragm 10 is made of a rubber material having a relatively low modulus, a certain thickness is required to satisfy the stiffness required for the product F0 and vibration. However, the thicker the thickness is, the more vibration space of the product is lost, and the development trend of ultrathin products is not satisfied. Meanwhile, since the conductive portion 12 contains the conductive particles 122, the flexibility of the conductive portion 12 is insufficient, if an embedded structure is adopted, if the thickness of the main body portion 11 is too thin, the toughness of the diaphragm 10 at the conductive portion 12 is insufficient, and the risk of rupture of the diaphragm is easy to occur.

Therefore, in the present embodiment, by controlling the thickness of the conductive portion 12 to be 0.5 μm to 50 μm, for example, 0.5 μm, 5 μm, 20 μm, 30 μm, 40 μm, 50 μm, or the like, the influence of the conductive portion 12 on vibration is reduced, and good vibration uniformity is ensured.

Alternatively, the thickness of the conductive portion 12 is 2 μm to 25 μm, which is convenient for processing and manufacturing, ensures uniformity and uniformity of thickness of the diaphragm 10, and also ensures conductivity of the conductive portion 12 while avoiding excessive rigidity of the conductive portion 12. When the conductive portion 12 having such a thickness is applied to the diaphragm 10, the service life of the diaphragm 10 can be prolonged, and occurrence of cracks or the like when the diaphragm 10 is used for a long time can be avoided.

Alternatively, the thickness of the conductive portion 12 is 0.5 μm to 50 μm while the thickness of the diaphragm 10 is 30 μm to 200 μm, so that the toughness and conductivity of the conductive portion 12 can be further ensured.

In some embodiments of the present invention, the portion of the main body 11 opposite to the conductive portion 12 and the conductive portion 12 are formed together into a composite portion, and the composite portion has no delamination between the conductive portion 12 and the main body 11 when the tensile strain is 20%, and the elastic recovery rate of the composite portion is greater than 70%.

In other words, the orthographic projection area of the conductive portion 12 on the main body portion 11 is defined as a first area, a composite portion is formed between a portion of the first area on the main body portion 11 and the conductive portion 12, and after 20% strain is drawn, there is no delamination between the conductive portion 12 and the main body portion 11, and the elastic restoring force is greater than 70%. Therefore, by matching the material of the main body 11 with the hybrid chain polymer in the conductive part 12, good interface adhesion can be realized, and consistency in the vibration stretching process is ensured, so that good rebound resilience of the vibrating diaphragm 10 is realized, and sound quality stability of the vibrating diaphragm 10 in the long-term use process is ensured.

In some embodiments of the present invention, the hybrid polymer of the conductive portion 12 includes at least one of polyurethane, polyurethane acrylate copolymer, epoxy modified polyurethane, polyurethane modified epoxy, and the like. In this embodiment, the conductive portion 12 including the above-mentioned hybrid polymer is used to facilitate a strong bonding force between the conductive portion 12 and the main body portion 11, so as to achieve vibration uniformity of the diaphragm 10 during vibration.

According to one embodiment of the present invention, the rubber material of the main body 11 is a carbon chain polymer, and the main body 11 includes at least one of nitrile rubber, hydrogenated nitrile rubber, acrylate rubber, urethane rubber, ethylene acrylate rubber, ethylene propylene diene rubber, and the like.

In this embodiment, the rubber material is a carbon chain polymer, and the main body 11 adopts the carbon chain polymer to achieve good adhesion with the hybrid chain polymer in the conductive portion 12, so as to ensure adhesion of the conductive portion 12, thereby achieving consistency of vibration of the diaphragm 10 in the vibration process and reliability of the diaphragm 10 product.

In some embodiments of the present invention, the conductive particles 122 have a particle size of not more than 20 μm, which enables the conductive portion 12 to have both high conductivity and flexibility. The particle size of the conductive particles 122 affects the resistivity and flexibility of the conductive portion 12, and if the particle size of the conductive particles 122 is larger, the toughness of the conductive portion 12 is insufficient, and breakage is likely to occur during vibration.

When the rubber material of the main body 11 of the vibrating diaphragm 10 is used to make the vibrating diaphragm 10, if the toughness of the conductive portion 12 is insufficient and the binding force with the rubber material of the main body 11 is insufficient, the risk of insufficient flexibility of the vibrating diaphragm 10 and cracking or even breaking of the conductive portion 12 during the vibration process will be generated, resulting in failure of circuit connection.

Thus, in the present embodiment, by controlling the particle diameter of the conductive particles 122 to be not more than 20 μm, for example, the particle diameters of the conductive particles 122 to be 5 μm, 10 μm, 12 μm, 15 μm, 20 μm, and the like, the toughness and the conductivity of the conductive portion 12 can be ensured, so that the diaphragm 10 can have both good conductive effect and conductive stability, and the toughness of the diaphragm 10 is improved, and the service life of the diaphragm 10 is prolonged.

In some embodiments of the present invention, the conductive particles 122 include at least one of metal particles and carbonaceous particles. Wherein, the metal particles can adopt at least one of gold, silver, copper, nickel, zinc, aluminum and the like. The carbon-containing particles may employ at least one of graphene, carbon black, carbon nanotubes, and the like. In the present embodiment, by employing metal particles and/or carbon-containing particles as the conductive particles 122, it is advantageous to ensure high conductivity of the conductive particles 122.

According to one embodiment of the present invention, the content of the conductive particles 122 in the conductive part 12 is not less than 50% wt and not more than 95% wt, enabling the conductive part 12 to have both toughness and conductivity. The number of conductive particles 122 also affects the resistivity and flexibility of the conductive portion 12. If the content of the conductive particles 122 is too large, although the electric resistance of the conductive portion 12 is lowered and the electric conductivity of the diaphragm 10 is improved, the toughness of the conductive portion 12 is liable to be insufficient with the increase of the conductive particles 122, and thus the content of the conductive particles 122 is less than or equal to 95% wt.

Therefore, in the present embodiment, by controlling the content of the conductive particles 122 in the conductive part 12 to be not less than 50% by weight and not more than 95% by weight, for example, the content of the conductive particles 122 is 50% by weight, 55% by weight, 60% by weight, 70% by weight, or the like, it is possible to make the conductive part 12 have both flexibility and high conductivity.

Optionally, the conductive particles 122 include at least one of metal particles and carbonaceous particles. The conductive particles 122 may be at least one of a sphere, a sphere-like shape, a line shape, a sheet shape, a tree shape, and the like. Wherein the sheet shape is advantageous in controlling the arrangement direction and the extending direction of the conductive particles 122, the sheet-shaped conductive particles 122 also have a large surface area. The sphere shape is favorable for processing and manufacturing, and has good conductivity.

In some embodiments of the present invention, a portion of the conductive portion 12 is embedded in the rubber material layer 114; or, the conductive portion 12 is provided on the outer surface of the main body portion 11.

When the conductive portion 12 is embedded in the main body 11, a groove may be formed in the main body 11, a portion of the conductive portion 12 is disposed in the groove formed in the main body 11, another portion of the surface of the conductive portion 12 is exposed out of the main body 11, and an outer surface of the conductive portion 12 may be flush with or protrude from an outer surface of the main body 11. Therefore, the vibrating diaphragm 10 with the structure can effectively ensure the assembly stability of the conductive part 12 on the main body part 11, and the conductive part 12 is embedded in the main body part 11, so that the thickness of the vibrating diaphragm 10 can be reduced to a certain extent, and the design space of a product is increased. In addition, the conductive part 12 is embedded in the main body 11, so that the consistency of vibration between the conductive part 12 and the main body 11 can be improved, and the sound production effect of the vibrating diaphragm 10 can be improved.

That is, when the structural design that a part of the conductive part 12 is embedded into the rubber material layer 114 is adopted, the rubber material of the main body part 11 protects the conductive part 12 during the vibration process, so that the fracture risk of the conductive part 12 during vibration and large displacement can be effectively reduced, and the requirements of the vibrating diaphragm 10 on large displacement, high loudness and high sensitivity are met.

When the conductive portion 12 is provided on the surface of the main body portion 11, the conductive portion 12 may be coated or adhered to the surface of the main body portion 11; or, the main body 11 and the conductive portion 12 are integrally injection molded. That is, when the conductive portion 12 is disposed on the surface of the main body 11, there may be various bonding manners between the conductive portion 12 and the main body 11, for example, by coating the conductive portion 12 on the surface of the main body 11, or by bonding the conductive portion 12 on the surface of the main body 11, or by integral injection molding. Thus, the diaphragm 10 according to the embodiment of the present invention has a simple structure, is convenient to manufacture, and can facilitate the electrical connection of the conductive part 12 with the voice coil 20 of the sound generating device or an external circuit.

According to one embodiment of the present invention, the plurality of conductive portions 12 are provided in plural, the plurality of conductive portions 12 are disposed at intervals, and the plurality of conductive portions 12 are located on the same side or opposite sides of the main body portion 11. For example, the number of the conductive parts 12 is two, the two conductive parts 12 are arranged at intervals, the two conductive parts 12 are arranged on the same side surface or two side surfaces of the main body part 11, and the arrangement number and arrangement positions of the conductive parts 12 can be selected according to actual use requirements.

In other words, the diaphragm 10 of the present embodiment may include two or more conductive portions 12 separated from each other, and each conductive portion 12 is located at the folded ring portion 111 of the diaphragm 10 and the outer edge portion 112 and the inner edge portion 113 connected thereto. The positive electrode and the negative electrode of the circuit are respectively connected with different conductive parts 12, and meanwhile, the conductive parts 12 are communicated with the folded ring part 111, and the outer edge part 112 and the inner edge part 113 which are connected with the folded ring part, so that the circuit connection is easier to operate, and the mass production performance is stronger. When the number of the conductive portions 12 is plural, the portion of the conductive portions 12 may play a role of balancing, that is, may allow the circuit to selectively electrically connect at least one of the plural conductive portions 12. The two adjacent conductive parts 12 on the same side can also be connected through a lead wire to control the serial-parallel connection condition, thereby realizing the control of the total resistance.

Depending on the actual use of the diaphragm 10, the conductive portions 12 at different positions may be disposed on the same surface of the diaphragm 10, or may be distributed on two surfaces of the diaphragm 10. This is because the design of the conductive portion 12 corresponds to adding a rib structure to the main body portion 11, and when all the conductive portions 12 are distributed on the same side surface of the diaphragm 10, there is a possibility that a problem of compliance asymmetry occurs, resulting in a large difference in upper and lower amplitudes.

In some embodiments of the present invention, the main body 11 includes a ring portion 111, an outer edge portion 112 disposed outside the ring portion 111, and an inner edge portion 113 disposed inside the ring portion 111, and the conductive portion 12 is disposed on the ring portion 111, and the inner edge portion 113 and the outer edge portion 112. For example, the main body 11 is formed from an outer edge 112, a folded ring 111 and an inner edge 113 from outside to inside, and the conductive portion 12 is disposed on the main body 11 through the outer edge 112, the folded ring 111 and the inner edge 113. Thus, in the present embodiment, by employing the collar portion 111, the inner edge portion 113, and the outer edge portion 112, it is convenient to achieve electrical connection of the diaphragm 10 to the voice coil 20 and the external circuit.

According to one embodiment of the present invention, the conductive part 12 includes a first electrical connection part at the inner edge part 113 and a second electrical connection part at the outer edge part 112, the first electrical connection part being electrically connected to the voice coil 20, and the second electrical connection part being electrically connected to an external circuit. In this embodiment, by adopting the first electrical connection portion and the second electrical connection portion to cooperate, the conductive portion 12 is electrically connected with the voice coil 20 and the external circuit, so as to solve the problems of the prior art that the internal vibration space is lost and the lead wire of the voice coil 20 is easily broken due to the connection piece such as the centering support piece.

In some embodiments of the present invention, the conductive portion 12 further includes a third electrical connection portion disposed on the folded ring portion 111, and the first electrical connection portion, the second electrical connection portion, and the third electrical connection portion are exposed on the outer surface of the main body portion 11.

That is, the inner edge portion 113 is provided with a first electrical connection portion, the outer edge portion 112 is provided with a second electrical connection portion, and the folded ring portion 111 is provided with a third electrical connection portion capable of electrically connecting the first electrical connection portion and the second electrical connection portion, and the first electrical connection portion, the second electrical connection portion and the third electrical connection portion together form the conductive portion 12. At least a portion of the conductive portions 12 may be exposed on the outer surface of the main body 11, so as to facilitate electrical connection with an external circuit.

The electrical connection relation between the conductive portion 12 and the voice coil 20 and the external circuit is not particularly limited, as long as the effect of being able to electrically connect the voice coil 20 and the external circuit is satisfied. In consideration of the fitting relation of the diaphragm 10 with the voice coil 20 and the external circuit, the first electrical connection portion may be electrically connected with the voice coil 20, and the second electrical connection portion may be electrically connected with the external circuit.

In some embodiments of the present invention, the main body portion 11 is formed as a single-layer structure composed of the rubber material layer 114; or, the main body 11 is formed as a multi-layer composite structure, the main body 11 includes a rubber material layer 114 and a damping layer 115 which are stacked, the rubber material layer 114 is located at the outermost layer of the main body 11, and the damping layer 115 includes at least one of acrylate pressure-sensitive adhesive, silicone pressure-sensitive adhesive, and polyurethane.

That is, the main body 11 may have a single-layer structure or a multi-layer composite structure. When the main body 11 has a multi-layer composite structure, the diaphragm 10 may have a multi-layer composite structure of the rubber material layer 114 and the damping layer 115. The damping layer 115 can be located at the inner side of the main body 11, for example, between the rubber material layers 114, and the damping layer 115 can play a role in buffering, so as to reduce the interaction force of the rubber material layers 114 at two sides in the vibration process, and effectively solve the layering problem in the process of large displacement.

Compared with the pure rubber material piece in the prior art, the main body part 11 comprising the rubber material layer 114 and the damping layer 115 has higher damping performance, the prepared vibrating diaphragm 10 has better polarization resistance and can obtain lower distortion effect.

In addition, the damping layer 115 can be at least one of acrylic pressure-sensitive adhesive, organic silicon pressure-sensitive adhesive and polyurethane, damping, temperature resistance, rebound and cohesiveness can be well considered by adopting the damping layer 115, the consistency of vibration of a composite structure can be ensured, and a larger space is provided for the design of a sound generating device product.

In this embodiment, the main body 11 may have a single-layer structure or a multi-layer composite structure, and may be provided as needed, which has the advantages of convenience in design and wide application range.

In summary, according to the diaphragm 10 of the embodiment of the present invention, by using the conductive part 12 and the main body part 11 to cooperate, and the conductive part 12 is made of a hybrid polymer with-NH-COO-characteristic groups, not only is the electrical connection between the voice coil 20 and the external circuit achieved, but also the problems of the loss of the internal space and the easy breakage of the leads caused by the connection members such as the centering support piece are avoided, and the diaphragm 10 provided by the present invention has high elasticity, excellent vibration consistency, and a wider linear vibration area.

The present invention also provides a sound generating device, which includes the vibrating diaphragm 10 of any of the above embodiments, and since the vibrating diaphragm 10 has the advantages described above, the sound generating device also has the advantages described above, for example, the sound generating device has low distortion, high loudness, and high fidelity sound quality, which are not described herein.

It should be noted that the diaphragm 10 provided by the present invention may be formed into any sound generating device. As shown in fig. 5, the sound generating device according to an embodiment of the present invention includes a housing, a magnetic circuit system disposed in the housing, and a vibration system matched with the vibration system, wherein the vibration system includes a diaphragm 10 and a voice coil 20 coupled to one side of the diaphragm 10, the magnetic circuit system drives the voice coil 20 to vibrate to drive the diaphragm 10 to generate sound, and the diaphragm 10 is the diaphragm 10 in the above embodiment. Specifically, when the sound generating device works, the voice coil 20 can vibrate up and down under the action of the magnetic field force of the magnetic circuit system after the voice coil 20 is electrified so as to drive the vibrating diaphragm 10 to vibrate, and sound can be generated when the vibrating diaphragm 10 vibrates.

According to a sound generating device of a further embodiment of the present invention, as shown in fig. 6, the sound generating device includes a housing, and a magnetic circuit system and a vibration system disposed in the housing, the vibration system includes a voice coil 20, a first diaphragm 21 and a second diaphragm 22, the top of the voice coil 20 is connected to the first diaphragm 21, the magnetic circuit system drives the voice coil 20 to vibrate to drive the first diaphragm 21 to generate sound, two ends of the second diaphragm 22 are respectively connected to an external circuit and the bottom of the voice coil 20, and the second diaphragm 22 is the diaphragm 10 of the above embodiment.

That is, the sound generating apparatus according to the embodiment of the present invention may further include two diaphragms 10, i.e., a first diaphragm 21 and a second diaphragm 22, prepared by the above-described embodiment of the present invention, the first diaphragm 21 may be used for vibration sound generation, and the second diaphragm 22 may be used for balancing the vibration of the voice coil 20. Specifically, when the sound generating device works, the voice coil 20 can vibrate up and down under the action of the magnetic field force of the magnetic circuit system after the voice coil 20 is electrified so as to drive the first vibrating diaphragm 21 to vibrate, and sound can be generated when the first vibrating diaphragm 21 vibrates. The second diaphragm 22 can also vibrate up and down along with the voice coil 20, and since two ends of the second diaphragm 22 are respectively connected with an external circuit and the bottom of the voice coil 20, the second diaphragm 22 can balance the vibration of the voice coil 20, and can prevent the voice coil 20 from generating polarization, thereby improving the sound production effect of the sound production device.

It should be noted that the first diaphragm 21 and the second diaphragm 22 may be used in combination with the diaphragm 10 according to the above embodiment of the present invention, or one of the first diaphragm 21 and the second diaphragm 22 may be used with the diaphragm 10 according to the above embodiment of the present invention, which is not particularly limited.

The electronic device according to the embodiment of the present invention includes the sound generating device of the above embodiment, and the sound generating device adopts the diaphragm 10 of the above embodiment, and since the diaphragm 10 according to the above embodiment of the present invention has the above technical effects, the electronic device according to the embodiment of the present invention also has corresponding technical effects, that is, the problems of the prior art that the internal vibration space is lost and the leads of the voice coil 20 are easily broken due to the assembly of the connecting piece such as the centering support piece can be avoided, and the requirements of large product displacement, high loudness, high sensitivity and the like can be satisfied.

The invention also provides an electronic device, which comprises the sounding device of any embodiment, and the electronic device of the invention has the advantages because the sounding device has the advantages, and the details are not repeated here.

The diaphragm 10 and the sound generating device according to the embodiment of the present invention will be described in detail with reference to specific embodiments.

In examples 1 to 6, the conductive part 12 was prepared using a conductive paste, and the conductive particles 122 were contained in the matrix 121 in the conductive paste, and the conductive particles 122 were selected from at least one of silver powder and graphene mixture, wherein the size of the conductive particles 122 was about 50nm to 10 μm, and the matrix 121 was a polyurethane polymer.

The comparative example adopts a common pure rubber material diaphragm, and the voice coil in the comparative example is communicated with an external circuit through a lead wire, and the diaphragm in the comparative example is a non-conductive diaphragm and does not have conductive performance.

The electroconductive pastes obtained in examples 1 to 6 were each printed on a hydrogenated nitrile rubber sheet (thickness: about 100 μm) by screen printing (screen mesh number: 250 mesh, blade hardness: 70A), cured at 100℃for 30 minutes, and the thickness of the electroconductive coating was measured to be about 7 μm to 15 μm after curing.

The method for evaluating the elastic recovery after 20% strain in table 1 is to use a stretching mode of a tensile machine or a DMA device to stretch a sample to 20% strain, remove an external force, and then measure the deformation amount of a sample piece, thereby calculating the elastic recovery. And simultaneously, whether a conductive layer on the surface layer of the sample to be tested is cracked or layered is visually detected.

The diaphragms 10 obtained in examples 1 to 6 and the diaphragms made of pure rubber materials of comparative examples were subjected to various performance tests, wherein the evaluation method of the elastic recovery after 20% strain is to use a stretching mode of a tensile machine or a DMA device, stretch a sample to 20% strain, remove an external force, and then measure the deformation amount of a sample piece, thereby calculating the elastic recovery. And simultaneously, whether a conductive layer on the surface layer of the sample to be tested is cracked or layered is visually detected.

The formulation ratios and test results of examples 1 to 6 are summarized in table 1 below.

TABLE 1 ingredients and test results Table

As shown in table 1, the same conductive particles 122 were contained in examples 1 to 4, and spherical and plate-shaped mixed silver powder was used, the content of the conductive particles 122 in example 1 was 93%, the content of the conductive particles 122 in example 2 was 80%, the content of the conductive particles 122 in example 3 was 70%, and the content of the conductive particles 122 in example 4 was 50%. While the sheet resistance of example 1 was not more than 10mΩ/≡25.4 μm, the sheet resistance of example 2 was 15mΩ/≡25.4 μm, the sheet resistance of example 3 was 27mΩ/≡25.4 μm, and the sheet resistance of example 4 was 80mΩ/≡25.4 μm. It can be seen that as the amount of the conductive particles 122 added increases, the sheet resistance decreases significantly, indicating an increase in conductivity.

However, example 1 had cracks after 20% strain, and the conductive portion 12 failed; the elastic recovery after 20% strain of example 2 was 87%, the elastic recovery after 20% strain of example 3 was 98%, and the elastic recovery after 20% strain of example 4 was 95%, and it was found that the elastic recovery of the composite part was decreased with an increase in the amount of the conductive particles 122, and in particular, the addition amount of the conductive particles 122 in example 6 was 93%, that is, the addition amount was 90% or more.

In addition, comparing example 1 with example 6, both of example 1 and example 6 use spherical and plate-like mixed silver powder, the coating thickness in example 1 is 7 um.+ -. 2um, the coating thickness in example 6 is 15 um.+ -. 2um, and the sheet resistance in example 1 and example 6 is not more than 10mΩ/≡/25.4 μm. Example 1 had delamination or cracking of the conductive layer after 20% strain and example 6 had no delamination or cracking of the conductive layer after 20% strain. That is, the thickness of the conductive portion 12 is not easily too thin, and if the conductive portion 12 is too thin, insufficient toughness between the conductive particles 122 is liable to be caused due to a decrease in film forming property of the polyurethane resin.

Comparing example 2 with example 5, the mixed silver powder of spherical shape and flake shape is adopted in example 2, the mixed silver powder of spherical shape and graphene flake is adopted in example 5, the sheet resistance of example 2 is 15mΩ/≡25.4 μm, the sheet resistance of example 5 is 30mΩ/≡25.4 μm, the elastic recovery rate of example 2 after 20% strain is 87%, and the elastic recovery rate of example 5 after 20% strain is 90%. It can be seen that the resistance of the conductive portion 12 containing graphene sheets is slightly higher than that of the silver flake, but the effect of the graphene sheet scheme is better in terms of toughness of the conductive portion 12.

Based on the above results, the design of the diaphragm 10 of comparative example and example 3 was selected, and further sound generating device was fabricated in combination with the voice coil 20, the magnetic circuit system, and the like.

The comparative diaphragm 10 is not conductive, and adopts a lead wire scheme which is conventional in the industry, namely, the voice coil 20 is communicated with an external circuit through a lead wire. The comparative example and example 3 were designed identically except for the point communication mode.

By comparing the acoustic performance of the sound emitting device, as shown in fig. 7 and 8, the following results can be obtained through the frequency response curve and the total harmonic distortion curve:

the frequency response curve shows that the two schemes differ little in low frequency performance, but example 3 has a lower resonant frequency F0 and intermediate frequency loudness example 3 is slightly lower than the comparative example. That is, since the resistance of the conductive portion 12 of embodiment 3 is higher than the lead resistance, this disadvantage can be optimized by only one step through the resistance and the magnetic circuit design.

Example 3 has lower distortion as shown by the total harmonic distortion curve. This phenomenon is related to the fact that the conductive portion 12 is disposed on the surface of the main body portion 11 of the diaphragm 10, and the conductive portion 12 is a flexible member. The conductive portion 12 of example 3 has higher compliance than the lead wire communication of the comparative example, and can vibrate together with the main body portion 11 of the diaphragm 10, the consistency of vibration is better, and thus lower distortion can be obtained.

In summary, compared with the prior art adopting a pure rubber type diaphragm and a common electric connection scheme, the diaphragm 10 has the conductive part 12, and the diaphragm 10 has the conductive performance, so that the problem that a short wire is very easy to occur in the vibration process due to the electric connection of a conventional voice coil with an external circuit through a voice coil lead can be solved; moreover, the vibrating diaphragm 10 in the invention can be provided with a centering support piece in a vibrating system, so that the structure for arranging the vibrating system is simpler; by limiting the materials of the conductive part 12 and the main body part 11, the bonding force between the conductive part 12 and the main body part 11 is better, and the vibration consistency is better, so that the high rebound resilience of the vibrating diaphragm 10 when the conductive part 12 is used for electric connection can be better realized, and the requirement of large-amplitude vibration can be met. The invention also provides a sound generating device and an electronic device, the sound generating device comprises the vibrating diaphragm 10 of any embodiment, and the vibrating diaphragm 10 has the advantages, so the sound generating device also has the advantages, and the description is omitted herein.

While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the 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 (15)

1. The vibrating diaphragm is characterized by comprising a main body part and a conductive part, wherein the main body part comprises a rubber material layer, the conductive part is arranged on the rubber material layer, at least a part of the conductive part is exposed out of the main body part to be electrically connected with a voice coil and an external circuit, the conductive part comprises a matrix and conductive particles dispersed in the matrix, and the matrix is composed of a hybrid polymer with-NH-COO-characteristic groups.

2. The diaphragm of claim 1, wherein the diaphragm has a thickness of 30 μm to 200 μm and the conductive portion has a thickness of 0.5 μm to 50 μm.

3. The diaphragm of claim 1, wherein the portion of the main body portion facing the conductive portion and the conductive portion together form a composite portion, the composite portion has no delamination between the conductive portion and the main body portion when the composite portion is strained by 20%, and the elastic recovery rate of the composite portion is greater than 70%.

4. The diaphragm of claim 1, wherein the hybrid polymer of the conductive portion comprises at least one of polyurethane, polyurethane acrylate copolymer, epoxy modified polyurethane, polyurethane modified epoxy.

5. The diaphragm of claim 1, wherein the rubber material of the body portion is a carbon chain polymer, and the body portion comprises at least one of nitrile rubber, hydrogenated nitrile rubber, acrylate rubber, urethane rubber, ethylene acrylate rubber, ethylene propylene diene rubber fluororubber.

6. The diaphragm of claim 1, wherein the conductive particles have a particle size of no more than 20 μm;

and/or the conductive particles include at least one of metal particles and carbonaceous particles.

7. The diaphragm of claim 1, wherein the conductive particles are present in the conductive portion in an amount of not less than 50% wt and not more than 95% wt.

8. The diaphragm of claim 1, wherein a portion of the conductive portion is embedded in the layer of rubber material;

or, the conductive part is arranged on the outer surface of the main body part.

9. The diaphragm of claim 1, wherein the plurality of conductive portions are spaced apart and are on the same side or opposite sides of the main body.

10. The diaphragm of claim 1, wherein the main body portion includes a folded ring portion, an outer edge portion disposed outside the folded ring portion, and an inner edge portion disposed inside the folded ring portion, and the conductive portion is disposed at the folded ring portion and the inner and outer edge portions.

11. The diaphragm of claim 10, wherein the conductive portion includes a first electrical connection portion at the inner edge portion and a second electrical connection portion at the outer edge portion, the first electrical connection portion being electrically connected to the voice coil, the second electrical connection portion being electrically connected to the external circuit.

12. The diaphragm of claim 11, wherein the conductive portion further comprises a third electrical connection portion disposed on the folded ring portion, and the first electrical connection portion, the second electrical connection portion, and the third electrical connection portion are exposed on an outer surface of the main body portion.

13. The diaphragm of any one of claims 1 to 12, wherein the main body portion is formed in a single-layer structure composed of the rubber material layer;

or, the main body part is formed into a multi-layer composite structure, the main body part comprises a rubber material layer and a damping layer which are arranged in a stacked manner, the rubber material layer is positioned on the outermost layer of the main body part, and the damping layer comprises at least one of acrylic pressure-sensitive adhesive, organic silicon pressure-sensitive adhesive and polyurethane.

14. A sound generating device comprising a diaphragm according to any one of claims 1-13.

15. An electronic device comprising the sound emitting apparatus of claim 14.

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