WO2021093114A1

WO2021093114A1 - Vibrating diaphragm and sound production device

Info

Publication number: WO2021093114A1
Application number: PCT/CN2019/129531
Authority: WO
Inventors: 宋启龙; 解志浩; 王昭明; 娄立杭
Original assignee: 歌尔股份有限公司
Priority date: 2019-11-11
Filing date: 2019-12-28
Publication date: 2021-05-20
Also published as: CN110972035B; CN110972035A

Abstract

Provided are a vibrating diaphragm and a sound production device, the vibrating diaphragm comprising a central part, wherein a surface of the central part is provided with a first connection area and a second connection area, the first connection area and the second connection area are provided with a micro-nano structure, the first connection area is configured to be connected to a voice coil by means of the micro-nano structure, and the second connection area is configured to be connected to a hard dome by means of the micro-nano structure. The micro-nano structure is arranged on a surface of the vibrating diaphragm, such that the connection strength between the vibrating diaphragm and the voice coil and between the vibrating diaphragm and the hard dome can be effectively improved, the voice coil can be prevented from falling off, and the hard dome is prevented from being stripped from the vibrating diaphragm.

Description

Diaphragm and sound device

Technical field

The present invention relates to the technical field of acoustics, and more specifically, the present invention relates to a diaphragm and a sound generating device.

Background technique

As a device that converts electrical energy into sound energy, speakers are widely used in mobile terminals such as mobile phones, computers, and pads. The performance of the device directly affects the sound reproduction effect of the terminal device. As one of the key components of loudspeaker sound production, the diaphragm is becoming more and more demanding, and it is gradually developing in the direction of high strength, high sound quality, and high waterproof and airtightness.

The existing loudspeaker diaphragm structure is mostly made of one or several composite structures among engineering plastics, thermoplastic elastomers, and rubber films, and part of the diaphragm is also formed of silicon rubber. In order to meet the requirements of high waterproof and air-tightness, the vibrating membrane and the rigid dome and shell are bonded in the form of glue. In order to increase the adhesive force of the existing diaphragm, the cohesive force and the adhesive force of the adhesive are usually changed, or by adding part of the long strip ribs or grooves on the surface of the diaphragm. The structure of the elongated ribs or grooves only partially increases the bonding force, and more is to improve the flatness and strength of the diaphragm, and the grooves and reinforcing ribs have certain requirements for the diaphragm material. At the same time, the height of the groove or rib is too high or too low, which will affect the bonding effect. For example, when the height is too large, the glue cannot effectively wet the surface of the diaphragm, forming bubbles, resulting in bonding failure and difficulty in demolding the diaphragm. In the prior art, the hard dome and the diaphragm are peeled off and the voice coil is dropped due to the reliability of diaphragm adhesion.

Therefore, it is necessary to improve the existing diaphragm to improve the connection strength between the diaphragm and other components of the speaker, and to improve the waterproof and airtightness.

Summary of the invention

An object of the present invention is to provide a diaphragm, which solves the problem of low connection strength between the existing diaphragm and other parts of the sound generating device.

Another object of the present invention is to provide a sound emitting device including the above-mentioned diaphragm.

A diaphragm, the diaphragm includes a central portion, the surface of the central portion has a first connection area and a second connection area;

The first connection area and the second connection area are provided with micro-nano structures;

The first connection area is configured to be connected to the voice coil through the micro-nano structure;

The second connection area is configured to be connected to the hard dome through the micro-nano structure.

Optionally, the central portion has a layered structure, and the first connection area and the second connection area are respectively formed on two opposite surfaces of the layered structure;

At least the area connected to the voice coil on the first connection area is provided with the micro-nano structure.

Optionally, the diaphragm further includes a fixing part, and the fixing part and the central part are integrally formed;

The surface of the fixing part has a third connection area, and the third connection area is provided with the micro-nano structure;

The third connection area is configured to be connected to the diaphragm support through the micro-nano structure.

Optionally, the micro-nano structure is a plurality of convex or concave structures formed on the surface of the diaphragm.

Optionally, the height of the convex structure or the depth of the concave structure is 2 μm-30 μm.

Optionally, the shape of the convex or concave structure is circular or/polygonal.

Optionally, the maximum outer contour size d1 of the shape of the convex or concave structure is 5 μm-50 μm.

Optionally, the distance d2 between two adjacent convex or concave structures along the arrangement direction is 5 μm-200 μm.

Optionally, the roughness of the surface with the micro-nano structure is Ra0.5-Ra2.0.

Optionally, the forming process of the diaphragm is a hot pressing forming process.

A sounding device, including:

A vibration system, the vibration system comprising a voice coil, a hard dome and the above-mentioned diaphragm; the voice coil and the hard dome are respectively connected to the diaphragm;

A magnetic circuit system, the magnetic circuit system includes a magnet configured to provide a magnetic field;

The vibration system is configured to convert electrical signals into sound signals under the action of the magnetic field of the magnetic circuit system.

The beneficial effect of the technical solution of the present invention is that: arranging the micro-nano structure on the surface of the diaphragm can effectively improve the connection strength between the diaphragm and the voice coil, the diaphragm and the hard dome, prevent the voice coil from falling off, and avoid the hard dome. Peel off the diaphragm.

Through the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear.

Description of the drawings

The drawings incorporated in the specification and constituting a part of the specification illustrate the embodiments of the present invention, and together with the description are used to explain the principle of the present invention.

Fig. 1 is a schematic diagram of a micro-nano structure on the surface of a diaphragm according to an embodiment of the present invention;

Figure 2 is a top view of a micro-nano structure according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of a diaphragm structure according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of a sound generating device according to an embodiment of the present invention.

The labels in the figure are as follows: 10-hard dome; 20-voice coil; 30-diaphragm; 301-central part; 3011-second connection area; 3012-first connection area; 302-fixed part; 3021-third Connection area; 303-folding ring; 40-diaphragm support.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any limitation to the present invention and its application or use.

The technologies, methods, and equipment known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be regarded as part of the specification.

In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiment may have different values.

It should be noted that similar reference numerals and letters denote similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

In order to meet the requirements of high waterproof and air-tightness in the existing speaker structure, the diaphragm, the hard dome and the shell are usually connected by glue. In order to increase the bonding force, the cohesive force and bonding force of the adhesive are usually changed, or by adding some long strips or grooves on the surface of the diaphragm. The structure of long ribs or grooves can only partially increase the bonding force, and the processing of grooves and reinforcing ribs has certain requirements for the diaphragm material. If the height of the groove or the rib is too high or too low, the bonding effect will be affected, and it is easy to cause problems such as bonding failure and difficulty in demolding the diaphragm. Even if grooves or ribs are provided on the surface of the diaphragm, the hard dome and the diaphragm may peel off and the voice coil may fall off from time to time. Therefore, it is necessary to improve the structure of the diaphragm to improve the connection strength between the diaphragm and other components of the speaker, and to avoid problems such as component falling off and sealing failure.

The present invention provides a diaphragm, the diaphragm includes a central portion, the surface of the central portion has a first connection area and a second connection area; the first connection area and the second connection area are provided with micro Nanostructures, the surface roughness of the micro/nano structure is Ra0.5-Ra2.0; the first connection area is configured to be connected to the voice coil through the micro/nano structure; the second connection area is It is configured to be connected to the hard dome through the micro-nano structure.

Optionally, as an embodiment, the diaphragm 30 of the present invention includes a central portion 301, and the central portion is located at the center of the diaphragm. The sound generating device includes a voice coil 20 and a hard dome 10, wherein the voice coil is used to pass in electrical signals, which vibrate under the action of a magnetic field, and transmit the vibration to the diaphragm connected to it, and the diaphragm vibrates and produces sound. The hard dome is connected to the diaphragm as a reinforcing part of the diaphragm, and is used to adjust the high and low frequencies of the diaphragm. Optionally, the surface of the central portion of the diaphragm has a first connection area 3012, and the first connection area is provided with a micro-nano structure as shown in FIG. 1, and the voice coil is connected to the first connection area through the micro-nano structure; The surface of the central part of the film also has a second connection area 3011, in which a micro-nano structure as shown in FIG. 1 is provided, and the hard dome is connected to the second connection area through the micro-nano structure. As a connection method, the voice coil and the diaphragm can be connected in an adhesive manner. Similarly, the hard dome and the diaphragm can also be connected by glue. The selection of the adhesive is common knowledge in the field, and the present invention will not elaborate on this. Setting the micro-nano structure on the surface of the diaphragm can significantly increase its specific surface area and improve the surface energy. At the same time, the micro-nano structure has an important contribution to the surface wettability of the adhesive coating, which can effectively improve the surface wettability of the adhesive and eliminate adhesion. The residual air at the interface significantly improves the bonding strength between the voice coil and the diaphragm, and the rigid dome and the diaphragm. The contribution of the micro-nano structure to the bonding strength well solves the problems of peeling of the hard dome and the voice coil falling off in the prior art, prolongs the service life of the sound generating device, and reduces the maintenance cost.

The surface roughness of the diaphragm with micro-nano structure is Ra0.5-Ra2.0. Within this roughness range, the macroscopic surface of the diaphragm does not change, and the micro-nano structure does not affect the surface flatness of the diaphragm. The surface flatness of the diaphragm has a greater impact on the center of the voice coil connected to it, and the center of the voice coil is one of the main leading factors in the acoustic performance of the speaker. Therefore, the surface flatness of the diaphragm is directly related to the acoustic performance of the speaker. contact. The roughness of the micro-nano structure on the surface of the diaphragm is set at Ra0.5-Ra2.0, which not only can ensure the acoustic performance of the speaker product, but also the micro-nano structure has a significant effect on improving the bonding strength.

Optionally, the central portion has a layered structure, and the first connection area and the second connection area are respectively formed on two opposite surfaces of the layered structure; at least on the first connection area The area connected with the voice coil is provided with the micro-nano structure.

As an embodiment, the central portion 301 of the present invention has a layered structure, and the first connection area 3012 and the second connection area 3011 are respectively arranged on two opposite surfaces of the central portion, namely the first connection area and the second connection area. The zones are respectively formed on the upper and lower surfaces of the central part. The voice coil 20 is connected to the first connection area of the central part, and at least the area connected to the voice coil is provided with a micro-nano structure. Setting the micro-nano structure in the area connected to the voice coil is beneficial to improve the bonding strength between the voice coil and the diaphragm, and at the same time can reduce the processing area of the micro-nano structure and reduce the processing cost. Optionally, the shape of the voice coil is a ring, and a ring-shaped micro-nano structure area is provided in the first connection area accordingly. Preferably, the width of the annular micro-nano area on the first connection area is greater than the width of the voice coil ring, which can increase the coating area of the adhesive, ensure sufficient adhesion between the adhesive and the surface of the voice coil to be bonded, and help improve the diaphragm Bonding strength with voice coil.

Optionally, the diaphragm further includes a fixing part, the fixing part and the central part are integrally formed; the surface of the fixing part has a third connection area, and the third connection area is provided with the micro-nano structure The third connection area is configured to be connected to the diaphragm support through the micro-nano structure. Among them, the diaphragm bracket refers to a structure or component that can be used to support and fix the diaphragm; for example, the diaphragm bracket can be the housing of a sound device; or, when the diaphragm is fixed to the magnetic circuit system, the diaphragm bracket refers to the fixed diaphragm Part of the combined magnetic circuit system; or, the diaphragm bracket refers to a support that supports and fixes the diaphragm to form a diaphragm assembly. At this time, the diaphragm bracket can be made of plastic or metal, and the structure can be a ring around the edge of the diaphragm. The structure is of course not limited to this material or ring structure. It should be understood that the structure and material of the diaphragm support are not limited to the above-mentioned cases, as long as the structure or components that can support and fix the diaphragm and contact the diaphragm can be used.

Fig. 3 is a schematic diagram of a diaphragm structure according to an embodiment of the present invention. As shown in FIG. 3, the diaphragm 30 of the present invention further includes a fixing portion 302. The fixing part can be integrally formed with the central part 301. In the transition area between the fixed part and the central part is a folding ring 303 of the diaphragm, and the folding ring is integrally formed with the fixed part and the central part. The surface of the fixing part has a third connection area 3021, and a micro-nano structure is provided on the third connection area. The sound generating device further includes a diaphragm holder 40, which is connected to the micro-nano structure of the third connection area. Optionally, the diaphragm support and the fixing part are connected by an adhesive. The arrangement of the micro-nano structure effectively improves the surface wetting ability of the adhesive by increasing the surface energy, and eliminates the residual air at the bonding interface, thereby significantly improving the bonding strength between the diaphragm support and the diaphragm.

By arranging micro-nano structures on the first connection area, the second connection area and the third connection area on the surface of the diaphragm, the connection strength between the sound device components and the diaphragm can be effectively improved, and the problem of falling off of the components that need to be connected to the diaphragm can be solved, and the The service life of the sound device. At the same time, the improvement of the connection strength has a positive contribution to the waterproof and sealing performance of the sound device, and on the other hand, the sound quality of the sound device can be significantly improved by reducing the deformation of the diaphragm.

As an embodiment of the present invention, the entire outer surface of the diaphragm is formed with micro-nano structures. The existence of the micro-nano structure is beneficial to the release of the stress of the diaphragm, can effectively prevent the deformation of the diaphragm, and keep the center of the voice coil. Maintaining the center of the voice coil can significantly improve the acoustic performance of the sounding device.

The micro-nano structure may be a plurality of convex structures formed on the surface of the diaphragm, and in this case, the micro-nano structure protrudes from the surface of the diaphragm. The micro-nano structure can also be arranged as a concave structure lower than the surface of the diaphragm. Alternatively, the micro-nano structure exists in a mixed form of a convex structure and a concave structure, and the convex structure and the concave structure are uniformly distributed on the surface of the diaphragm. This setting method can further improve the stress relief capability of the diaphragm.

When the micro-nano structure is a convex structure, the height of the convex structure is 2 μm-30 μm; when the micro-nano structure is a concave structure, the depth is 2 μm-30 μm. Setting the height or depth of the micro-nano structure within the range of 2μm-30μm will not only help increase the wettability of the adhesive to the surface, improve the bonding strength of each component and the diaphragm, but also avoid the excessive amount of adhesive and the diaphragm. The problem of reduced acoustic performance of the sound generating device caused by the increase in the overall weight.

Optionally, the shape of the convex or concave structure is circular or/polygonal. As an embodiment, the shape of the micro-nano structure can be set to be circular, which facilitates the molding of the micro-nano structure, improves the wettability of the adhesive, and further improves the connection strength between the diaphragm and other components.

Specifically, as shown in FIG. 2, the shape of the concave or convex structure can be set as a circle, and its maximum outer contour size d1 is the diameter of the circle. The maximum outer contour size d1 of the concave or convex structure shape is set in the range of 5μm-50μm, that is, the size of the concave or convex structure is kept within the micro-nano size range. On the one hand, it has an impact on the surface flatness of the diaphragm On the other hand, the adhesive has better wettability for the micro/nano structures within the size range, which is beneficial to improve the connection strength between the diaphragm and other components, and improve the acoustic performance of the sound device. At the same time, the micro-nano structure in this size range has a large surface energy, which can effectively promote the improvement of bonding strength.

Optionally, as shown in FIG. 2, the distance d2 between two adjacent convex or concave structures along the arrangement direction is 5 μm-200 μm. The convex structures or concave structures can be arranged horizontally or longitudinally, and the distance d2 between two adjacent convex structures or concave structures is 5 μm-200 μm. Alternatively, the convex structures or concave structures can also be arranged along the circumferential direction, and the distance d2 between two adjacent convex structures or concave structures is 5 μm-200 μm. The present invention does not limit the arrangement of the convex structure or the concave structure, and those skilled in the art can choose according to needs. Setting the distance d2 between two adjacent convex structures or concave structures to be 5 μm-200 μm can greatly improve the bonding strength between the diaphragm and other components, and the acoustic performance of the sound device is excellent. Optionally, the convex or concave structures are uniformly arranged on the surface of the diaphragm, which facilitates the processing of micro-nano structures.

Optionally, the forming process of the diaphragm is a hot pressing forming process. The hot press forming process may be one or a combination of gas explosion forming, compression forming, and vacuum adsorption forming, which is not limited in the present invention. The hot press forming process can also be other forming methods that can provide pressure and heat, and those skilled in the art can choose according to actual needs. The diaphragm formed by the hot press molding process has a stable shape, is not easy to be deformed, has high mechanical strength and temperature resistance, and the diaphragm will not be deformed due to vibration and heat during use, ensuring the acoustic performance of the sound device. Preferably, the hot press molding process may be compression molding. The compression molding method can provide uniform and stable pressure to each part of the diaphragm. Preferably, a metal mold is used, which has the characteristics of good thermal conductivity, convenient processing, and low cost, and the molded diaphragm has stable quality and small deformation. The mold for forming the diaphragm can be processed by machining, electrical discharge processing, laser processing, etching process or sandblasting process, etc., preferably electrical discharge processing, laser processing and sandblasting process, the surface quality of the obtained mold is better.

The present invention also provides a sound generating device, including: a vibration system, the vibration system includes a voice coil, a hard dome and the above-mentioned diaphragm; the voice coil and the hard dome are respectively connected to the vibration The sound generating device further includes a magnetic circuit system, the magnetic circuit system includes a magnet, the magnet is configured to provide a magnetic field; the vibration system is configured to be capable of transmitting electrical signals under the action of the magnetic field of the magnetic circuit system It is converted into a sound signal, so as to realize the sound function of the sound device.

The surface of the diaphragm of the present invention is provided with micro-nano structures. As shown in Fig. 4, the voice coil, the hard dome and the diaphragm support are respectively connected to the areas on the surface of the diaphragm with the micro-nano structures. The arrangement of the micro-nano structure increases the surface energy of the diaphragm, can improve the wetting effect of the adhesive on the surface of the diaphragm, reduce the bubbles in the adhesive, so that the adhesive and the micro-nano structure form a mechanical interlocking, which improves the diaphragm and voice coil, The strength of the connection between the hard dome and the diaphragm support, thereby improving the waterproof and sealing performance of the sound generating device, and improving the acoustic performance of the sound generating device.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims

A diaphragm, characterized in that the diaphragm includes a central portion, and the surface of the central portion has a first connection area and a second connection area;

The first connection area and the second connection area are provided with micro-nano structures;

The first connection area is configured to be connected to the voice coil through the micro-nano structure;

The second connection area is configured to be connected to the hard dome through the micro-nano structure.
The diaphragm according to claim 1, wherein the central portion is a layered structure, and the first connection area and the second connection area are respectively formed on two opposite surfaces of the layered structure on;

At least the area connected to the voice coil on the first connection area is provided with the micro-nano structure.
The diaphragm according to claim 1, wherein the diaphragm further comprises a fixing part, and the fixing part and the central part are integrally formed;

The surface of the fixing part has a third connection area, and the third connection area is provided with the micro-nano structure;

The third connection area is configured to be connected to the diaphragm support through the micro-nano structure.
The diaphragm according to claim 1, wherein the micro-nano structure is a plurality of convex or concave structures formed on the surface of the diaphragm.
The diaphragm according to claim 4, wherein the height of the convex structure or the depth of the concave structure is 2 μm-30 μm.
The diaphragm according to claim 4, wherein the shape of the convex or concave structure is circular or/polygonal.
The diaphragm according to claim 4, wherein the maximum outer contour size d1 of the shape of the convex or concave structure is 5 m-50 m.
The diaphragm according to claim 4, wherein the distance d2 between two adjacent convex or concave structures along the arrangement direction is 5 μm-200 μm.
The diaphragm according to claim 1, wherein the surface roughness of the micro-nano structure is Ra0.5-Ra2.0.
The diaphragm according to claim 1, wherein the forming process of the diaphragm is a hot pressing forming process.
A sound generating device, characterized in that it comprises:

A vibration system, the vibration system comprising a voice coil, a hard dome and the diaphragm according to any one of claims 1-10; the voice coil and the hard dome are respectively connected to the diaphragm;

A magnetic circuit system, the magnetic circuit system includes a magnet configured to provide a magnetic field;

The vibration system is configured to convert electrical signals into sound signals under the action of the magnetic field of the magnetic circuit system.