CN115955639A - Vibrating diaphragm, sound production device and electronic equipment - Google Patents

Abstract

The invention discloses a vibrating diaphragm, a sound production device and electronic equipment, wherein the vibrating diaphragm comprises a main body part and an electric conduction part, the main body part comprises a thermoplastic material layer, the electric conduction part is arranged on the thermoplastic material layer, at least one part of the electric conduction part is exposed out of the main body part so as to be electrically connected with a voice coil and an external circuit, the electric conduction part comprises a matrix and electric conduction particles dispersed in the matrix, and the matrix is composed of a heterochain polymer with-NH-COO-characteristic groups. The vibrating diaphragm provided by the invention not only realizes the electric connection between the voice coil and an external circuit, but also avoids the problem that the internal space is lost and a lead is easy to break caused by connecting pieces such as a centering support piece and the like, and has better anti-polarization capability and listening performance.

Description

Vibrating diaphragm, sound production 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 connection member electrically connecting an internal circuit and an external circuit of the sound generating device. Wherein, the voice coil includes two voice coil lead wires, and two voice coil lead wires are connected with two pads electricity of electric connector respectively through modes such as spot welding, and external circuit is connected to electric connector electricity simultaneously to the signal of telecommunication control voice coil through terminal product. Generally, a lead of the voice coil needs to be threaded with a certain length, and the lead is suspended to be electrically connected with the electrical connector. Although the suspension lead structure can realize higher sensitivity, the amplitude of the voice coil cannot be too large due to the suspension limitation of the lead, the wire breaking risk is higher, the low-frequency effect is not obvious enough, and better user auditory experience cannot be provided for a user.

In the existing products, some sound generating devices further include a centering pad, the centering pad is usually combined on one side of the diaphragm, and the centering pad can be used as an electrical connection part between the voice coil and the outside. Specifically, the connection line of the voice coil is connected to the spider, and the spider is connected to an external circuit, thereby achieving electrical connection. In fact, although the hidden danger of voice coil loudspeaker voice coil lead wire broken string has effectively been solved in the application of centering branch piece, the existence of centering branch piece can occupy sound generating mechanism's inner space to lose the acoustic performance of product to a certain extent, and then reduced user's audio frequency and experienced.

In order to solve the above problems, in the related art, a conductive diaphragm is further provided, which has a conductive property and can realize an electrical connection between a voice coil and an external circuit. However, the conductive diaphragm has general damping performance and poor polarization resistance, so that the sound production effect of the diaphragm is influenced.

Disclosure of Invention

The invention aims to provide a vibrating diaphragm which has the advantages of good damping performance and strong anti-polarization capability.

The invention further aims to provide a sound-producing device consisting of the diaphragm.

The invention also aims to provide the electronic equipment consisting of the sound production device.

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

The diaphragm according to the embodiment of the first aspect of the present invention includes a main body portion and a conductive portion, wherein the main body portion includes a thermoplastic material layer, the conductive portion is disposed on the thermoplastic material layer, and at least a portion of the conductive portion is exposed to the main body portion to electrically connect the voice coil and an external circuit, the conductive portion includes a matrix and conductive particles dispersed in the matrix, and the matrix is composed of a heterochain polymer having a characteristic group of-NH-COO-.

According to the diaphragm disclosed by the embodiment of the first aspect of the invention, the main body part and the conductive part are combined, and the substrate of the conductive part contains the heterochain polymer with the-NH-COO-characteristic group, so that the conductive part can have good adhesive force with the main body part, the bonding force between the substrate and the conductive particles can be enhanced, the consistency of the diaphragm in the stretching process is ensured, the good rebound resilience of the diaphragm is realized, and the tone quality stability of the diaphragm in the long-term use process is ensured. The vibrating diaphragm provided by the embodiment of the invention not only realizes the electric connection between the voice coil and an external circuit, but also avoids the problem that the internal space is lost and a lead wire is easy to break caused by connecting pieces such as a centering support piece and the like, and because the thermoplastic material is adopted as the main body part, the main body part and the conductive part of the vibrating diaphragm provided by the invention have better bonding force and vibration consistency, and meanwhile, the balance of the vibrating diaphragm on rigidity and damping is further improved by additionally arranging the conductive part, so that the vibrating diaphragm has better anti-polarization capability; the main body part can be flexibly selected according to the design requirement of a product, is convenient to process and is easy to produce in batches.

According to some embodiments of the present invention, the diaphragm has a thickness of 20 μm to 150 μm, and the conductive portion has a thickness of 0.5 μm to 35 μm.

According to some embodiments of the present invention, a portion of the main body portion facing the conductive portion and the conductive portion are formed together as a composite portion, and a modulus ratio of the composite portion to the main body portion is 1/3 to 20/1; and/or the damping of the composite part is not lower than the damping of the main body part.

According to some embodiments of the invention, the conductive portion has an elongation at break of greater than 30%.

According to some embodiments of the invention, the layer of thermoplastic material of the body portion comprises at least one of a thermoplastic polyurethane elastomer, a thermoplastic polyester elastomer, a thermoplastic polyimide material, a polyether ether copper, a thermoplastic polyester material, a polyarylate, a polyetherimide.

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

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 comprise at least one of metal particles and carbonaceous particles.

According to some embodiments of the present invention, the content of the conductive particles in the conductive portion 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 main body portion; alternatively, the conductive portion is provided on an outer surface of the main body portion.

According to some embodiments of the invention, the conductive part is a plurality of conductive parts, the plurality of conductive parts are arranged at intervals, and the plurality of conductive parts are located on the same side or two opposite sides of the main body part.

According to some embodiments of the invention, the main body portion includes a folded-over portion, an outer edge portion provided outside the folded-over portion, and an inner edge portion provided inside the folded-over portion, and the conductive portion is provided on the folded-over 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 present invention, the conductive portion further includes a third electrical connection portion disposed on the folded 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.

According to some embodiments of the invention, the body portion is formed as a single layer structure consisting of the thermoplastic material layer; or the main body part is formed into a multilayer composite structure and comprises the thermoplastic material layer and a damping layer which are arranged in a laminated mode, the thermoplastic material layer is located on the outermost side of the main body part, and the damping layer comprises at least one of acrylate pressure-sensitive adhesive, silicone pressure-sensitive adhesive and polyurethane.

The sound-emitting device according to the second aspect of the present invention includes the diaphragm according to any one of the above embodiments.

According to an embodiment of the third aspect of the present invention, the electronic device includes the diaphragm of any of the above embodiments.

Other features of the present invention and advantages thereof 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 one embodiment of the present invention;

FIG. 3 is a partial cross-sectional view of a diaphragm according to one embodiment of the present invention;

FIG. 4 is a partial cross-sectional view of a diaphragm according to one embodiment of the invention;

FIG. 5 is a partial cross-sectional view of a diaphragm according to one embodiment of the invention;

FIG. 6 is a partial cross-sectional view of a diaphragm according to one embodiment of the invention;

figure 7 is a top view of a sound emitting device according to one embodiment of the present invention;

FIG. 8 is a schematic perspective view of a sound generating device according to an embodiment of the present invention

Fig. 9 is a partial cross-sectional view of a sound emitting device according to an embodiment of the present invention;

fig. 10 is a partial cross-sectional view of a sound emitting device according to another embodiment of the present invention.

Reference numerals

A main body portion 11; a loop part 111; an outer edge portion 112; an inner edge portion 113; a layer of thermoplastic material 114; a damping layer 115; the first layer 11a; the second layer 11b; a third layer 11c; the fourth layer 11d; a fifth layer 11e;

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

a voice coil 20; a first diaphragm 21; a 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, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

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

Techniques, methods, and apparatus known to 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 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, it need not be discussed further in subsequent figures.

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

As shown in fig. 1 to 7, 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 thermoplastic material layer 114, the conductive portion 12 is disposed on the thermoplastic material layer 114, and at least a portion of the conductive portion 12 is exposed out of the main body 11 to electrically connect to a voice coil 20 and an external circuit, the conductive portion 12 includes a base 121 and conductive particles 122 dispersed in the base 121, and the base 121 is made of a heterochain polymer with a characteristic group of-NH-COO-.

In other words, the diaphragm 10 according to the embodiment of the present invention mainly includes the main body portion 11 and the conductive portion 12, where the main body portion 11 may be a main body structure, and the main body portion 11 includes the thermoplastic material layer 114, and may be made of a thermoplastic material. Because the thermoplastic material has the advantages of tensile strength and heat resistance, the diaphragm 10 with the main body portion 11 made of the thermoplastic material layer 114 can have tensile resistance, and the sound generating device using the diaphragm 10 has polarization resistance and heat resistance.

And because thermoplastics have relatively high modulus, stiffness and strength, the thickness of the thermoplastic material is thinner to achieve the same compliance. Therefore, the thickness of the diaphragm 10 can be reduced by using a thermoplastic material, and the weight of the diaphragm 10 can be reduced. And on the premise of reducing the thickness of the diaphragm 10, the diaphragm 10 has high rigidity and high elasticity.

The conductive portion 12 includes the base 121 and the conductive particles 122, so that the conductive portion 12 has a conductive property, and circuit conduction can be achieved. Specifically, at least a part of the surface of the conductive part 12 can be exposed out of the surface of the main body 11 and electrically connected to the voice coil 20 and the external circuit, so that the problems of loss of internal vibration space and easy breakage of the lead of the voice coil 20 caused by a connecting part such as a centering support chip in the prior art are solved. It can be seen that the circuit connection operation is simplified by exposing at least one surface of the conductive part 12 to the surface of the main body part 11.

Meanwhile, the existence of the substrate 121 of the conductive part 12 can protect the conductive particles 122 to a certain extent, so that the conductive part 12 has better oxidation resistance, corrosion resistance and the like.

Moreover, by combining the substrate 121 and the conductive particles 122, the substrate 121 and the thermoplastic material of the body 11 have a strong combining ability compared to a pure conductor or a surface coating or plating, which is beneficial to the polarization resistance of the diaphragm 10 during operation.

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

That is, the substrate 121 in the conductive part 12 is made of a heterochain polymer with a characteristic group of-NH-COO-, which can achieve a better bonding effect between the substrate 121 and the conductive particles 122 in the conductive part 12, increase the interaction force between the substrate 121 and the conductive particles 122, and ensure the consistency and the conductive stability during the vibration process. Specifically, when the diaphragm 10 vibrates at a high temperature, the substrate 121 of the conductive portion 12 contains the heterochain polymer with the-NH-COO-characteristic group, and the heterochain polymer in the substrate 121 can play a better role of a link and can connect the conductive particles 122 into a whole, so that the conductive particles 122 can be uniformly arranged, and the conductive consistency and stability of the conductive portion 12 can be ensured.

In addition, because the polar group-NH-COO-exists in the substrate 121, the conductive part 12 can be cured at a low temperature, so that the influence of the summary of the curing process on the thermoplastic material is reduced, and the risk of product deformation is reduced. Meanwhile, the existence of the polar group-NH-COO-is also beneficial to improving the bonding force between the conductive part 12 and the main body part 11, and the vibration consistency of the diaphragm 10 is easily realized.

It should be noted that, the diaphragm 10 may stretch and bend inevitably during the vibration process, and the conductive portion 12 of the heterochain polymer having the characteristic group of-NH-COO-and the main body portion 11 of the thermoplastic material are adopted in the present invention, and both have good adhesion, so as to ensure the consistency of the vibration and to increase the tensile strength of the conductive portion 12 to a certain extent.

Therefore, the diaphragm 10 according to the embodiment of the present invention combines the main body portion 11 and the conductive portion 12, and the matrix 121 of the conductive portion 12 contains a heterochain polymer having a-NH-COO-characteristic group, so that the conductive portion 12 and the main body portion 11 have a good adhesion force, the bonding force between the matrix 121 and the conductive particles 122 can be enhanced, and the consistency of the diaphragm 10 in the stretching process is ensured, thereby realizing a good resilience of the diaphragm 10, and ensuring the sound quality stability of the diaphragm 10 in the long-term use process. The vibrating diaphragm 10 of the embodiment of the invention not only realizes the electric connection between the voice coil 20 and an external circuit, but also avoids the problem that the internal space is lost and a lead wire is easy to break caused by connecting pieces such as a centering support piece and the like, and because the main body part 11 is made of thermoplastic materials, the main body part 11 and the conductive part 12 of the vibrating diaphragm 10 have better bonding force and vibration consistency, and meanwhile, the balance of the vibrating diaphragm 10 on rigidity and damping is further improved by adding the conductive part 12, so that the vibrating diaphragm has better anti-polarization capability; the main body part 11 can be flexibly selected according to the design requirements of products, is convenient to process and is easy to produce in batches.

According to one embodiment of the invention, the thickness of the diaphragm is 20 μm to 150 μm, which can ensure the rigidity and conductivity of the conductive part 12. It should be noted that, since the main body 11 is made of a thermoplastic material, in this embodiment, by controlling the thickness of the diaphragm 10 to be 20 μm to 150 μm, the diaphragm 10 can obtain better polarization resistance.

In addition, since the conductive portion 12 is exposed on a 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 affect 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 large, so that the vibration uniformity of the diaphragm 10 tends to deteriorate, and in addition, the tensile deformation of the diaphragm 10 is restricted. If the thickness of the conductive portion 12 is too thin, it is liable to be limited by the processing technique, and it is difficult to effectively ensure the thickness uniformity and uniformity of the diaphragm 10, resulting in unstable conductivity of the conductive portion 12 and also liable to crack during vibration of the diaphragm 10, causing a risk of an increase in resistance.

Therefore, in the present embodiment, by controlling the thickness of the conductive portion 12 to be 0.5 μm to 35 μm, for example, 0.5 μm, 5 μm, 20 μm, 30 μm, 35 μm, or the like, the influence of the conductive portion 12 on the vibration is reduced, and good vibration uniformity is ensured.

Alternatively, while the thickness of the diaphragm 10 is 20 μm to 150 μm, the thickness of the conductive portion 12 is 0.5 μm to 35 μm, which can further ensure the toughness and conductivity of the conductive portion 12.

In some embodiments of the present invention, the portion of the main body portion 11 facing the conductive portion 12 and the conductive portion 12 are formed together as a composite portion, and the modulus ratio of the composite portion to the main body portion 11 is 1/3 to 20/1.

In other words, an orthographic projection area of the conductive portion 12 on the main body portion 11 is defined as a first area, and a composite portion is formed between a portion of the first area on the main body portion 11 and the conductive portion 12. Since the conductive portion 12 contains the conductive particles 122 having rigidity, the rigidity of the conductive portion 12 is easily affected by the size and content of the conductive particles 122. When the particle diameter of the conductive particles 122 is small and the addition amount is low, the modulus of the conductive portion 12 is more affected by the flexible heterochain polymer; however, when the conductive particles 122 are large in size and added in a large amount, the rigidity of the conductive part 12 after film formation is close to the rigidity of a metal material or a carbon material, and the conductive part has a high modulus and a large rigidity. When the conductive part 12 is located at a part of the main body part 11, the conductive part 12 exists like a bracket for the main body part 11, the rigidity of the conductive part 12 can affect the compliance of the main body part 11 when vibrating, and if the modulus of the conductive part 12 is higher, the modulus of the composite part can also be increased, so that the vibration displacement of the composite part in the vibrating process is limited. Therefore, in the present embodiment, by defining the modulus ratio of the composite portion to the main body portion 11 to be not more than 20/1, a necessary vibration displacement can be obtained. Further, if the modulus of the conductive portion 12 is lowered, the composite modulus of the composite portion is also lowered when it is significantly lower than that of the main body portion 11, and the composite portion has a lower modulus at the time of vibration, which causes problems such as stress concentration and polarization, and therefore, in the present embodiment, the occurrence of the polarization problem can be reduced by limiting the modulus ratio of the composite portion to the main body portion 11 to not less than 1/3.

Thus, in the present embodiment, the modulus ratio of the composite portion to the main body portion 11 is limited to 1/3 to 20/1, for example, the modulus ratio of the composite portion to the main body portion 11 is 1/3, 1/4, 1/10, 1/15, 1/20, and the like, so that the rigidity and the compliance of the diaphragm can be ensured. When the vibrating diaphragm is applied to the sound production device, the phenomenon that the sound production device is poor in listening caused by polarization can be avoided.

In some embodiments of the invention, the damping of the composite portion is not lower than the damping of the main body portion 11. The conductive part 12 contains conductive particles 122 and a heterochain polymer with-NH-COO-characteristic groups, wherein the heterochain polymer is used as a film forming material, which not only ensures uniform dispersion of the conductive particles 122 and conductive stability, but also increases adhesion between the conductive particles 122 and the main body 11. It should be noted that, besides providing conductivity, the conductive particles 122 may generate inevitable relative movement between the conductive particles 122 and the heterochain polymer during the vibration deformation process of the diaphragm product, so as to achieve the effect of increasing the damping of the conductive portion 12.

According to one embodiment of the present invention, the conductive portion 12 has an elongation at break greater than 30%. That is, the elongation at break of the conductive part 12 is greater than 30%, that is, when the diaphragm vibrates, even if the product is strained by 30%, the conductive part 12 of the composite part does not have a problem of cracking or breaking, and the conductive part 12 has good adhesion to the main body part 11.

In some embodiments of the present invention, the thermoplastic material layer 114 of the body portion 11 comprises at least one of a thermoplastic polyurethane elastomer, a thermoplastic polyester elastomer, a thermoplastic polyimide material, a polyether ether copper, a thermoplastic polyester material, a polyarylate, a polyetherimide, and the like.

According to one embodiment of the present invention, the heterochain polymer of the conductive portion 12 comprises at least one of polyurethane, urethane acrylate copolymer, epoxy-modified polyurethane, urethane-modified epoxy resin, or the like. In this embodiment, the conductive portion 12 including the heterochain polymer is adopted, so that a strong bonding force is provided between the conductive portion 12 and the main body portion 11, and the vibration consistency of the diaphragm 10 in the vibration process is achieved.

According to an embodiment 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 part 12, and if the particle size of the conductive particles 122 is larger, the toughness of the conductive part 12 is insufficient, and the conductive part is likely to be broken when vibrated.

When the vibrating diaphragm 10 is made of the thermoplastic material of the main body portion 11 of the vibrating diaphragm 10, if the toughness of the conductive portion 12 is insufficient and the bonding force with the thermoplastic material of the main body portion 11 is insufficient, the vibrating diaphragm 10 is insufficient in flexibility, and the conductive portion 12 cracks or even breaks in the vibrating process, so that the circuit communication fails.

Therefore, in the embodiment, by controlling the particle size of the conductive particles 122 to be not greater than 20 μm, for example, the particle size 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 good conductive effect and conductive stability at the same time, 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. The metal particles may be at least one of gold, silver, copper, nickel, zinc, aluminum, and the like. The carbonaceous particles may employ at least one of graphene, carbon black, carbon nanotubes, and the like. In the present embodiment, by using metal particles and/or carbonaceous 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 portion 12 is not less than 50% wt, and not more than 95% wt, enabling the conductive portion 12 to have both toughness and conductivity. The resistivity and flexibility of the conductive portion 12 are also affected by the number of the conductive particles 122, and if the content of the conductive particles 122 is too large, although the resistance of the conductive portion 12 is reduced and the conductivity of the diaphragm 10 is improved, the toughness of the conductive portion 12 is likely to be insufficient as the number of the conductive particles 122 increases.

Therefore, in the present embodiment, by controlling the content of the conductive particles 122 in the conductive portion 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 to be 50% by weight, 55% by weight, 60% by weight, 70% by weight, or the like, it is possible to make the conductive portion 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 spherical type, a spherical-like type, a linear type, a sheet type, a tree type, and the like.

When the conductive part 12 is embedded in the main body 11, a groove may be formed in the main body 11, a part of the conductive part 12 is disposed in the groove formed in the main body 11, and another part of the surface is exposed out of the main body 11, and the outer surface of the conductive part 12 may be flush with or protrude from the 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 part 11, so that the vibration consistency of the conductive part 12 and the main body part 11 can be improved, and the sound production effect of the diaphragm 10 can be improved.

That is to say, when the structure design that a part of the conductive portion 12 is embedded in the thermoplastic material layer 114 is adopted, the thermoplastic material of the main body portion 11 plays a role in protecting the conductive portion 12 in the vibration process, so that the risk of breakage of the conductive portion 12 during vibration and large displacement can be effectively reduced, and the requirements of the diaphragm 10 product 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 on or bonded to the surface of the main body portion 11; alternatively, 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 a plurality of bonding methods between the conductive portion 12 and the main body 11, for example, the conductive portion 12 is disposed on the surface of the main body 11 by coating, or the conductive portion 12 is disposed on the surface of the main body 11 by bonding, or the conductive portion 12 is disposed on the surface of the main body 11 by integral injection molding. Therefore, the diaphragm 10 according to the embodiment of the present invention has a simple structure and is convenient to manufacture, and the conductive portion 12 can be conveniently electrically connected to the voice coil 20 of the sound generating apparatus or an external circuit.

According to an embodiment of the present invention, the conductive portion 12 is plural, the plural conductive portions 12 are spaced apart, and the plural 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 portions 12 is two, the two conductive portions 12 are disposed at intervals, the two conductive portions 12 are disposed on the same side surface or both side surfaces of the main body portion 11, and the number and the disposition positions of the conductive portions 12 may 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 in the corrugated portion 111 of the diaphragm 10 and the outer edge portion 112 and the inner edge portion 113 connected thereto. The positive and negative poles 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, part of the conductive portions 12 may have a balance function, that is, a circuit may be selectively electrically connected to at least one of the plural conductive portions 12. Two adjacent conductive parts 12 on the same side can also be connected through a lead wire to control the serial-parallel connection condition, so as to realize the control of the total resistance.

According to the actual use condition 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 designed to be distributed on two surfaces of the diaphragm 10. This is because the design of the conductive parts 12 is equivalent to adding a reinforcing rib structure to the main body part 11 for the main body part 11, and when all the conductive parts 12 are distributed on the same side surface of the diaphragm 10, a problem of compliance asymmetry may occur, resulting in a large difference in the vertical amplitude.

In some embodiments of the present invention, the main body 11 includes a folded-loop portion 111, an outer edge portion 112 disposed outside the folded-loop portion 111, and an inner edge portion 113 disposed inside the folded-loop portion 111, and the conductive portion 12 is disposed on the folded-loop portion 111 and the inner and outer edge portions 113 and 112. For example, the main body 11 is composed of an outer edge 112, a corrugated portion 111, and an inner edge 113 from the outside to the inside, and the conductive portion 12 penetrates the outer edge 112, the corrugated portion 111, and the inner edge 113 and is provided in the main body 11. Thus, in the present embodiment, by using the folded ring portion 111, the inner edge portion 113, and the outer edge portion 112, the electrical connection of the diaphragm 10 to the voice coil 20 and the external circuit is facilitated.

According to one embodiment of the present invention, the conductive portion 12 includes a first electrical connection portion at the inner edge portion 113 electrically connected to the voice coil 20 and a second electrical connection portion at the outer edge portion 112 electrically connected to an external circuit. In this embodiment, the first electrical connection portion and the second electrical connection portion are used to cooperate with each other, and the conductive portion 12 is electrically connected to the voice coil 20 and the external circuit, so as to solve the problems of loss of internal vibration space and easy breakage of the lead wire of the voice coil 20 caused by the connection component such as the centering chip in the prior art.

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

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

Note that, the electrical connection relationship between the conductive portion 12 and the voice coil 20 and the external circuit is not particularly limited as long as the effect of electrically connecting the voice coil 20 and the external circuit is satisfied. In consideration of the assembly relationship 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 body portion 11 is formed as a single layer structure composed of the thermoplastic material layer 114; or, the main body portion 11 is formed into a multilayer composite structure, the main body portion 11 includes a thermoplastic material layer 114 and a damping layer 115 which are stacked, the thermoplastic material layer 114 is located at the outermost side of the main body portion 11, and the damping layer 115 includes at least one of an acrylate pressure-sensitive adhesive, a 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 body 11 has a multilayer composite structure, the diaphragm 10 may have a multilayer composite structure of the thermoplastic material layer 114 and the damping layer 115. The damping layer 115 can be located inside the main body 11, for example, between the thermoplastic material layers 114, and the damping layer 115 can play a role in buffering, so as to reduce the interaction force of the thermoplastic material layers 114 on both sides in the vibration process, and effectively solve the problem of delamination in case of large displacement.

In this embodiment, by providing the damping layer 115, the elasticity of the main body portion 11 can be increased, the modulus of the diaphragm can be reduced, the stiffness of the diaphragm can be increased, and meanwhile, the vibration impact can be effectively buffered, thereby avoiding the risk of membrane rupture.

In addition, damping layer 115 can select for use at least one in acrylic acid ester pressure-sensitive adhesive, silicone class pressure-sensitive adhesive, the polyurethane, through adopting above-mentioned damping layer 115 can be fine compromise damping, temperature resistant, resilience and cohesiveness, can ensure the uniformity of composite construction vibration, provides bigger space for the design of sound generating mechanism 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 is advantageous in that it is easy to design and has a wide application range.

In summary, according to the diaphragm 10 of the embodiment of the present invention, by using the heterochain polymer in which the conductive portion 12 is matched with the main body portion 11 and the conductive portion 12 has the characteristic group of-NH-COO-, not only the electrical connection between the voice coil 20 and the external circuit is achieved, but also the problem of internal space loss and easy lead wire breakage caused by the connection member such as the centering chip is avoided, and the diaphragm 10 provided by the present invention has high elasticity, excellent vibration uniformity, and a wider linear vibration region.

The invention also provides a preparation method of the vibrating diaphragm, which comprises the following steps: printing the pattern of the conductive part 12 on the film of the main body part 11 by adopting printing modes such as silk screen printing, gravure printing, printing and the like, curing and shaping, then carrying out hot press molding by adopting hot press molding equipment, and cutting to a required size after molding.

The invention also provides a preparation method of the diaphragm, which comprises the following steps: the thin film of the main body portion 11 is formed on a hot press forming device, and then the conductive portion is manufactured, cured and shaped by using transfer printing, glue spraying or glue dispensing and other processes. And then cut to the desired size.

The invention further provides a sound generating device, which comprises the vibrating diaphragm 10 of any one of the embodiments, and the vibrating diaphragm 10 has the advantages, so that the sound generating device also has the advantages, for example, the sound generating device has low distortion, high loudness and high fidelity sound quality, which is not described herein again.

It should be noted that the diaphragm 10 provided by the present invention can constitute a sound generating device with any configuration. As shown in fig. 9, the sound generating apparatus according to an embodiment of the present invention includes a housing, and a magnetic circuit system and a vibration system, which are disposed in the housing, and are matched with the vibration system, where 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 of the above embodiment. Specifically, when the sound generating mechanism works, the voice coil 20 can vibrate up and down to drive the vibrating diaphragm 10 to vibrate under the action of the magnetic field force of the magnetic circuit system after being electrified, and the vibrating diaphragm 10 can generate sound when vibrating.

A sound generating apparatus according to another embodiment of the present invention, as shown in fig. 10, 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, a 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 a 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 prepared according to the above-described embodiments of the present invention, that is, a first diaphragm 21 and a second diaphragm 22, where the first diaphragm 21 may be used for vibrating and generating sound, and the second diaphragm 22 may be used for balancing the vibration of the voice coil 20. Specifically, when the sound generating device works, after the voice coil 20 is powered on, under the action of the magnetic field force of the magnetic circuit system, the voice coil 20 can vibrate up and down to drive the first vibrating diaphragm 21 to vibrate, and the first vibrating diaphragm 21 can generate sound when vibrating. The second diaphragm 22 can also vibrate up and down along with the voice coil 20, because the two ends of the second diaphragm 22 are respectively connected with the external circuit and the bottom of the voice coil 20, the second diaphragm 22 can balance the vibration of the voice coil 20, so that the phenomenon of polarization of the voice coil 20 can be prevented, and the sound production effect of the sound production device can be improved.

It should be noted that, the first diaphragm 21 and the second diaphragm 22 may be both the diaphragms 10 according to the above embodiments of the present invention, or one of the first diaphragm 21 and the second diaphragm 22 may be the diaphragm 10 according to the above embodiments of the present invention, and the present invention is not limited to this specifically.

The electronic device according to the embodiment of the present invention includes the sound generating device according to the above-mentioned embodiment, and the sound generating device employs the diaphragm 10 according to the above-mentioned embodiment of the present invention, and because the diaphragm 10 according to the above-mentioned embodiment of the present invention has the above-mentioned technical effects, the electronic device according to the embodiment of the present invention also has corresponding technical effects, that is, the problems of internal vibration space loss and easy breakage of the lead wire of the voice coil 20 caused by assembling the connection parts such as the centering chip in the prior art can be avoided, and the requirements of large displacement, high loudness, high sensitivity and the like of the product can be satisfied.

The invention further provides an electronic device, which comprises the sound generating device of any one of the embodiments, and the electronic device of the invention also has the advantages because the sound generating device has the advantages, which are not described herein again.

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.

Example 1

The conductive part 12 is made of polyurethane conductive silver paste, the thickness of the conductive part 12 is 10 micrometers, and the conductive part 12 contains polyurethane resin and silver powder (the particle size is 20 nm-10 micrometers, and the adding amount is 75%); the body portion 11 is a polyester-based thermoplastic elastomer (TPEE) having a thickness of 40 μm, a modulus of 200MPa, and a damping of 0.1.

Example 2

The conductive part 12 is polyurethane conductive silver paste, the thickness of the conductive part 12 is 10 μm, and the conductive part comprises polyurethane resin and silver powder (the grain diameter is 20 nm-10 μm, and the adding amount is 80%); the body portion 11 is a polyester-based thermoplastic elastomer (TPEE) having a thickness of 40 μm, a modulus of 200MPa, and a damping of 0.1.

Comparative example 1

The conductive material is selected from silicon-containing flexible silver paste, specifically, the conductive material is conductive silver paste containing organic silicon, the thickness of the conductive material is 10 micrometers, the particle size of the silver powder is 20 nm-10 micrometers, and the adding amount is 65%; the main material is polyester thermoplastic elastomer (TPEE), the thickness is 40 mu m, and the modulus is 200MPa.

Comparative example 2

Selecting flexible silver paste containing silicon as a conductive material, specifically, selecting conductive silver paste containing organic silicon as the conductive material, wherein the thickness of the conductive material is 10 micrometers, the particle size of the silver powder is 20 nm-10 micrometers, and the addition amount is 75%); the main material is polyester thermoplastic elastomer (TPEE), the thickness is 40 μm, the modulus is 200MPa, and the damping is 0.1.

The silver paste obtained in example 1 and example 2 is placed on the film surface of the main body 11 by printing or glue spraying or printing, and the silver paste obtained in comparative example 1 and comparative example 2 is placed on the film surface of the main body by printing or glue spraying or printing, and then is heated and cured (100 ℃ -150 ℃, cured for 30 min-2 h), and after cooling to room temperature, a plurality of tests are performed, and the test results are summarized in table 1 below.

In the adhesion test, the test was performed by a hundred grid test, a 3M,600 tape. The sheet resistance test was tested by a four-probe Fang Zuyi. During modulus test, the long-strip-shaped composite part is cut, and DMA equipment, a stretching mode and a temperature scanning mode are adopted for testing, and the value mode and the storage modulus at room temperature are adopted. In the damping test, a long-strip-shaped composite part is cut, and the test is carried out by adopting a DMA device, a stretching mode and a temperature scanning mode, wherein the value mode is a tangent value at room temperature.

TABLE 1 test results

In comparison between comparative example 1 and example 1 with table 1, the conductive material containing silicon used in comparative example 1 has a defect of lower adhesion than the thermoplastic polyester material used in example 1, although the conductive material containing silicon also has superior toughness. In addition, example 1 has lower resistance and higher damping.

Comparing the change in elongation at break of comparative example 2 compared to comparative example 1 with the change of example 2 compared to example 1, it can be seen that the flexibility is remarkably reduced as compared to the polyurethanes as the content of the silver powder is increased. This is related to polyurethanes which have less film-forming properties than the polar conductive materials containing silicon.

Comparing comparative example 2 with example 1, comparative example 2 has the same silver powder content as example 1, the polyurethane conductive material of example 1 has lower resistance, and the polyurethane conductive material has stronger bonding force with silver powder due to the polar group, and can provide more damping property and higher modulus.

Next, in embodiments 3 to 8, the body 11 with different configurations can be selected to adjust the product performance according to the size of the sound generating device, F0, the acoustic performance of the product, the listening sound, and other requirements. In embodiments 3 to 8, the conductive portions 12 are provided on a partial surface of the main body portion 11.

Example 3

As shown in fig. 1, the main body portion 11 includes at least one of thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic polyimide material, polyether ether copper, thermoplastic polyester material, polyarylate, and polyetherimide. The main body 11 may be a single-layer structure with a single component or a multi-layer structure prepared by multi-layer co-extrusion, and compared with a multi-layer composite film, the main body is characterized in that the interlayer adhesion force is extremely large and the main body cannot be peeled off mechanically.

Example 4

As shown in fig. 2, the main body 11 is composed of a first layer 11a and a second layer 11b, and the main body 11 is a two-layer composite structure of thermoplastic materials. The first layer 11a and the second layer 11b may be at least one of thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic polyimide material, polyether ether copper, thermoplastic polyester material, polyarylate, and polyetherimide, respectively.

Example 5

As shown in fig. 3, the main body 11 is composed of a first layer 11a, a second layer 11b and a third layer 11c, wherein the first layer 11a or the third layer 11c is at least one of thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic polyimide material, polyether ether copper, thermoplastic polyester material, polyarylate and polyetherimide. The second layer 11b is at least one of acrylate pressure sensitive adhesive, silicone pressure sensitive adhesive, and polyurethane.

Example 6

As shown in fig. 4, the main body 11 is composed of a first layer 11a, a second layer 11b, a third layer 11c and a fourth layer 11d, wherein the first layer 11a, the second layer 11b or the fourth layer 11d is at least one of thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic polyimide material, polyether ether copper, thermoplastic polyester material, polyarylate and polyetherimide. The third layer 11c is at least one selected from acrylate pressure sensitive adhesive, silicone pressure sensitive adhesive, and polyurethane. The conductive portion 12 may be provided on the surface of the first layer 11a or on the surface of the fourth layer 11 d.

Example 7

As shown in fig. 5, the main body 11 is composed of a first layer 11a, a second layer 11b, a third layer 11c, a fourth layer 11d and a fifth layer 11e, wherein the first layer 11a, the second layer 11b, the fourth layer 11d and the fifth layer 11e are at least one of thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic polyimide material, copper polyether ether, thermoplastic polyester material, polyarylate and polyetherimide. The third layer 11c is at least one selected from acrylate pressure sensitive adhesive, silicone pressure sensitive adhesive, and polyurethane.

Example 8

As shown in fig. 6, the main body 11 is composed of a first layer 11a, a second layer 11b, a third layer 11c, a fourth layer 11d and a fifth layer 11e, wherein the first layer 11a, the third layer 11c and the fifth layer 11e are at least one of thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic polyimide material, polyether ether copper, thermoplastic polyester material, polyarylate and polyetherimide. The second layer 11b and the fourth layer 11d are at least one selected from acrylate pressure sensitive adhesives, silicone pressure sensitive adhesives, and polyurethane.

In summary, the diaphragm 10 according to the present invention employs the main body portion 11 and the conductive portion 12 in combination, employs the thermoplastic material as the main body portion 11, and includes the-NH-COO-characteristic group in the conductive portion 12, such that the conductive portion 12 and the main body portion 11 have better bonding force and vibration uniformity, and the conductive portion 12 is added to further improve the balance between the rigidity and the damping of the diaphragm 10, such that the diaphragm has better anti-polarization capability, and the conductive portion 12 has an improvement effect on the rigidity and the damping of the diaphragm 10, such that the diaphragm has better anti-polarization capability and listening performance. In addition, the main body 11 can be flexibly selected according to the design requirements of products, is convenient to process and is easy to produce in batches. The sound generating device and the electronic device of the present invention have the same advantages as the diaphragm 10 of any of the above embodiments, and have anti-polarization capability and good listening performance, which are not described herein again.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications can 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 (16)

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

2. The diaphragm of claim 1, wherein the thickness of the diaphragm is 20 μm to 150 μm, and the thickness of the conductive portion is 0.5 μm to 35 μm.

3. The diaphragm of claim 1, wherein a portion of the main body portion facing the conductive portion and the conductive portion form a composite portion together, and a modulus ratio of the composite portion to the main body portion is 1/3 to 20/1;

and/or the damping of the composite part is not lower than the damping of the main body part.

4. The diaphragm of claim 1 wherein the conductive portion has an elongation at break of greater than 30%.

5. The diaphragm of claim 1, wherein the thermoplastic material layer of the body portion comprises at least one of a thermoplastic polyurethane elastomer, a thermoplastic polyester elastomer, a thermoplastic polyimide material, a polyether ether copper, a thermoplastic polyester material, a polyarylate, and a polyetherimide.

6. The diaphragm of claim 1, wherein the heterochain polymer of the conductive portion comprises at least one of polyurethane, urethane acrylate copolymer, epoxy modified polyurethane, and urethane modified epoxy resin.

7. The diaphragm of claim 1, wherein the conductive particles have a particle size of not more than 20 μm;

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

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

9. The diaphragm of claim 1, wherein a portion of the conductive portion is embedded in the main body portion;

alternatively, the conductive portion is provided on an outer surface of the main body portion.

10. The diaphragm of claim 1, wherein the conductive portion is a plurality of conductive portions, 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.

11. The diaphragm of claim 1, wherein the main body portion includes a folded-loop portion, an outer edge portion disposed outside the folded-loop portion, and an inner edge portion disposed inside the folded-loop portion, and the conductive portion is disposed on the folded-loop portion and the inner edge portion and the outer edge portion.

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

13. The diaphragm of claim 12, wherein the conductive portion further includes a third electrical connection portion disposed on the bending 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.

14. The diaphragm of any one of claims 1-13, wherein the body portion is formed as a single layer structure composed of the thermoplastic material layer;

or the main body part is formed into a multilayer composite structure and comprises the thermoplastic material layer and a damping layer which are arranged in a laminated mode, the thermoplastic material layer is located on the outermost side of the main body part, and the damping layer comprises at least one of acrylate pressure-sensitive adhesive, silicone pressure-sensitive adhesive and polyurethane.

15. A sound-emitting device, characterized by comprising a diaphragm according to any one of claims 1 to 14.

16. An electronic device characterized by comprising the sound emitting apparatus of claim 15.

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