WO2021093339A1

WO2021093339A1 - Miniature sound production device and electronic product

Info

Publication number: WO2021093339A1
Application number: PCT/CN2020/099489
Authority: WO
Inventors: 葛连山; 王兴龙
Original assignee: 歌尔股份有限公司
Priority date: 2019-11-12
Filing date: 2020-06-30
Publication date: 2021-05-20
Also published as: CN112866884A

Abstract

Disclosed are a miniature sound production device and an electronic product. The miniature sound production device comprises: a vibration assembly, comprising a diaphragm which has a surround portion and a fixing portion, with the surround portion extending in a ring shape, and the fixing portion being formed at the periphery of the surround portion in a surrounding manner; and a housing assembly, comprising a main housing and a backing ring, with the backing ring being connected to the main housing in a sealed manner, the diaphragm being arranged on the backing ring, the fixing portion being fixedly connected to the backing ring in a molten manner to form a molten zone, and the difference between the melting temperature of the backing ring and the melting temperature of the diaphragm being lower than 60°C. One technical effect of the present invention is to improve the waterproof performance between the diaphragm and the housing assembly.

Description

A miniature sounding device and electronic product

Technical field

The present invention belongs to the technical field of electroacoustic energy conversion. Specifically, the present invention relates to a miniature sound generating device.

Background technique

In recent years, the technology of consumer electronic products has developed rapidly, and electronic products such as mobile phones, tablet computers, and wireless headsets are widely used in consumers' lives. Correspondingly, manufacturers have also improved the performance of electronic products in many ways to meet the increasingly stringent performance requirements faced by consumer electronic products in practical applications.

Micro-sounding devices are important components in consumer electronic products. They are used to convert electrical signals into sound. They are indispensable components in consumer electronic products such as mobile phones and earphones. In order to use complex application environments, waterproof performance has become an important indicator of micro-sounding devices.

In the existing miniature sounding device, the diaphragm is often fixedly connected with the housing or the bearing part of the sounding device by means of glue coating. However, adhesive bonding cannot meet the requirements of waterproof performance. Once the diaphragm of the micro sound device leaks liquid and the liquid is immersed in the inside of the micro sound device, its functional reliability will be greatly affected.

In order to make the micro sound device meet the requirements of waterproof performance, it is necessary to improve the micro sound device.

Summary of the invention

An object of the present invention is to provide an improved miniature sound generating device.

According to the first aspect of the present invention, there is provided a miniature sound emitting device, including:

A vibrating component, the vibrating component comprising a diaphragm, the diaphragm having a folded ring portion and a fixed portion, the folded ring portion extends in a ring shape, and the fixed portion is formed around the periphery of the folded ring portion;

A housing assembly, the housing assembly includes a main housing and a backing ring, the backing ring is sealingly connected to the main housing, the diaphragm is arranged on the backing ring, and the fixing part is connected to the backing ring. The backing ring is fused and fixedly connected to form a melting band, and the difference between the melting temperature of the backing ring and the melting temperature of the diaphragm is less than 60 degrees Celsius.

Optionally, the fixing portion and the backing ring are fused and fixedly connected by laser hot melting.

Optionally, the temperature range of laser melting is 120 degrees Celsius-450 degrees Celsius.

Optionally, the material of the backing ring is at least one of polycarbonate plastic, polyphthalamide plastic, and polyether plastic with a thiophenyl group.

Optionally, the material of the diaphragm is at least one of polyether ether ketone plastic, polyarylate plastic, and thermoplastic polyester rubber.

Optionally, the melting temperature of the main housing is greater than the melting temperature of the diaphragm and the backing ring by 60 degrees Celsius.

Optionally, the backing ring and the main housing are integrally formed by an integral injection molding process.

Optionally, the fixing portion includes a flat portion extending laterally outward from the folding ring portion, and the flat portion is fixedly connected to the backing ring.

Optionally, the fixing portion includes a flange extending longitudinally from the plane portion, and the flange is fused and fixedly connected to the side surface of the backing ring.

Another aspect of the present invention also provides an electronic product, which includes:

The main body of electronic products;

In the above-mentioned micro-sounding device, the micro-sounding device is arranged in the main body of the electronic product, and the micro-sounding device is electrically connected with the signal connector in the main body of the electronic product.

The technical effect of the present invention is that the waterproof performance between the diaphragm and the housing assembly in the micro-sound device is significantly improved.

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 three-dimensional structure of a miniature sound emitting device provided by the present invention;

Figure 2 is an exploded schematic diagram of some parts of the miniature sounding device provided by the present invention;

Figure 3 is a partial side cross-sectional view of the micro-sounding device provided by the present invention;

FIG. 4 is a side cross-sectional view of a micro-sounding device according to another embodiment of the present invention;

Fig. 5 is a side cross-sectional view of a micro-sounding device according to another embodiment of the present invention.

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 indicate similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

The present invention provides an improved miniature sound emitting device, which comprises a vibration component and a shell component. The vibration component includes a diaphragm. The vibration component is a component capable of vibrating and realizing the sound production function in the miniature sound generating device, and the vibration component may also include components such as a voice coil, which is not limited by the present invention.

Among them, the diaphragm can drive the air to vibrate and generate sound during the vibration process. As shown in FIGS. 1 and 2, the diaphragm 1 has a folding ring portion 11 and a fixing portion 12. The folding ring portion 11 has a bent structure, which extends into an annular structure. The folded ring portion 11 and the area surrounded by the folded ring portion 11 are parts that can vibrate up and down. The fixing portion 12 is formed around the periphery of the folding ring portion 11, and the fixing portion 12 is a part that is fixedly connected to other components of the micro-sound device and cannot be vibrated.

The housing assembly 2 is used to carry the vibration assembly and other components in the miniature sound generating device. The housing assembly 2 includes a main housing and a backing ring 21. The main casing constitutes the main frame of the micro-sound device, and its interior can accommodate components such as voice coils and magnets. The backing ring 21 is fixed on the main housing, and is used to form a fixed connection with the diaphragm 1 for supporting the diaphragm 1.

As shown in FIG. 3, the diaphragm 1 is arranged on the backing ring 21, and the fixing portion 12 and the backing ring 21 are fused and fixedly connected in the form of hot fusion, thereby forming a melting band 10. The fixing portion 12 and the backing ring 21 are melted and fixed to form an integral structure, and the two have a good connection tightness and airtightness. In particular, the backing ring uses a material that has a melting temperature similar to that of the diaphragm, and it is preferable that the difference between the melting temperature of the backing ring and the melting temperature of the diaphragm is less than 60 degrees Celsius. In this way, when the diaphragm and the backing ring are hot-melt fixedly connected, it is easy to control the hot-melt temperature, and there is no need to raise the melting temperature to an excessively high temperature, avoiding damage to other components of the micro-sounding device. When the hot melt temperature is raised to an appropriate temperature, the backing ring and the fixing part can be melted at the same time.

Through the sealing connection process of fusion fixed connection, the waterproof effect of the diaphragm and the housing assembly is significantly improved, the space occupied by the waterproof process is relatively small, and the use of waterproof glue is also greatly reduced, thereby reducing the production of micro-sounding devices cost. On the other hand, the structural reliability of the micro-sounding device has also been improved. In the later life test, problems such as cracking between the diaphragm and the housing assembly are not easy to occur, and the two realize a tight and reliable fixed connection.

In the technical solution of the present invention, the housing assembly includes two structures: a main housing and a backing ring. The backing ring is mainly used to realize a fusion and fixed connection with the diaphragm, and the main shell is mainly used to provide a bearing and support for the miniature sounding device. The main shell and the backing ring can be made of different materials to meet the different performance requirements of the two. The material of the backing ring can be a material that is easy to form a fusion connection with the diaphragm, such as a material with a low melting point and low strength; the material of the main housing can be a material with higher structural strength, hardness, and higher melting point.

Optionally, the fixing portion and the backing ring are fixedly connected by laser melting. The local and instantaneous high temperature generated by the laser can melt the surface of the backing ring and the fixed part of the diaphragm, and fuse the two together. After the laser irradiation is canceled, the fusion belt can be quickly cooled and the fixed part and the surface of the backing ring form an integral adhesion structure to achieve a good fixed connection and waterproof sealing effect. The laser melting process has the characteristics of short heating time, accurate heating temperature, and concentrated heating area, which can not only meet the requirements of melting and connecting the fixed part and the backing ring, but also effectively reduce the risk of heating damage to other parts of the micro sound device. On the other hand, when testing the reliability and life of the micro-sound device, the temperature of the high-temperature durability test is much lower than the temperature of the laser melting process, and the fixing part and the backing ring will not melt, which avoids the diaphragm and shell assembly The problem of cracking and detachment.

Optionally, the temperature range of the laser melting is between 120 degrees Celsius and 450 degrees Celsius. For the materials of the diaphragm and the backing ring, a material whose melting temperature is within the above-mentioned temperature range can be selected. In this way, when a laser is used to irradiate the area where the fixing part and the backing ring overlap, the temperature of the area rises to this area, and the fixing part and the backing ring can be melted. On the one hand, the above-mentioned preferred temperature range can protect the other components of the micro-sound device and reduce the risk of being damaged by high temperature; on the other hand, it can ensure that the fixing part and the backing ring are melted and cooled as soon as possible, shortening the processing time, and fixing The part and the backing ring form a clear and neat melting zone.

Optionally, the material of the backing ring may be at least one of polycarbonate plastic, polyphthalamide plastic, and polyether plastic with a thiophenyl group. First of all, these materials have a proper melting temperature. When the backing ring is heated to the melting temperature of the above-mentioned materials used, other parts of the micro-sounding device are not easily affected by the temperature and cause problems such as damage and failure. Second, these materials have relatively excellent melting connectivity and relatively close melting temperatures with the diaphragm. Since the diaphragm needs to have good elastic deformation and vibration and sound performance, the material used for the diaphragm is limited by its acoustic performance. The above-mentioned material preferably used for the backing ring can achieve a good fusion connection with the material of the diaphragm, and has a melting temperature similar to the material of the diaphragm. When the backing ring is made of the above-mentioned materials, the fusion fixing connection process Easier to implement and higher reliability.

Optionally, the material of the diaphragm may be at least one of polyether ether ketone plastic, polyarylate plastic, and thermoplastic polyester rubber. The diaphragm made of the above-mentioned materials can exhibit good acoustic performance, and the elastic deformation ability can meet the sound demand of the miniature sound emitting device. Further, the above-mentioned materials are easier to form a fusion fixed connection with other plastic materials, and the compatibility is higher.

By selecting the materials of the backing ring and the diaphragm, the melting temperature of the two is controlled within 60 degrees Celsius, so that the optimal melting temperature can be selected. During the fusion connection process, the two can be melted at the same time, and there is no need to increase the temperature too high. While ensuring the reliability of the fusion connection, avoid the diaphragm, other areas of the housing assembly or other micro-sounding devices. Parts are affected by high temperature.

Preferably, the material of the diaphragm can be selected as a light-transmitting material, and the material of the backing ring can be selected as a light-absorbing material. When performing a laser fusion fixing connection process on the fixing part and the backing ring, since the fixing part is covered on the backing ring, the laser needs to pass through the fixing part to apply heat radiation to the backing ring. However, if the material of the diaphragm is selected as a light-transmitting material, the laser light can pass through the fixing portion and directly hit the backing ring, which better heats up and melts the surface of the backing ring quickly. Further, if the material of the backing ring is selected as a light-absorbing material, the main housing located under the backing ring will not be irradiated by the laser, and the direct heat radiation received is greatly reduced. This design method can provide temperature protection for structures other than the fixed part of the diaphragm and the backing ring, and reduce the possibility of direct laser heat radiation for other structures. Moreover, by designing a light-transmitting diaphragm, the fixing part and the backing ring covered by the fixing part can be rapidly heated and melted together to achieve the effect of rapid melting, and then rapidly cooled to form a fusion fixed connection.

Preferably, the melting temperature of the main housing is at least 60 degrees Celsius higher than the melting temperature of the diaphragm and the backing ring. The main housing is used to provide a stable and reliable structural support function for the micro sounding device, and it needs to have good structural stability. Preferably, when the diaphragm and the backing ring are fused, fixed and connected, the main casing needs to maintain good structural strength to avoid problems such as melting, softening and deformation of the main casing. Through the selection of the materials of the backing ring, the diaphragm and the main housing, the material of the main housing can be selected as a material whose melting temperature is at least 60 degrees higher than the melting temperature of the diaphragm and backing ring to reduce the high temperature of the main housing. Impact.

Preferably, the main housing can be made of metal material, and the backing ring is made of plastic material.

Optionally, the main casing and the backing ring can be made by an integral injection molding process, so as to improve the reliability and sealing of the connection between the main casing and the backing ring. In the case that both the main shell and the backing ring are made of plastic materials, the two materials can be injected into different areas of the injection mold through the injection molding process, so that the two materials are in contact and integrated at the butting surface, thereby achieving The integral injection molding between the main shell and the backing ring effectively improves the reliability and sealing of the connection between the two. When the main shell is made of metal and the backing ring is made of plastic material, the backing ring can be directly injection-molded on the surface of the main shell, thereby realizing the integral injection molding of the two and improving the gap between the two. Connection reliability and tightness.

In addition, the main housing and the backing ring can also be fixedly connected by ultrasonic welding or the like.

As shown in Fig. 3, the area where the fixing portion 12 and the backing ring 21 are fused and fixedly connected forms a melting band 10, where the fixing portion 12 and the backing ring 21 are integrated. The melting belt 10 has a belt-like structure, and its width is the melting width. Preferably, the melting width ranges from 0.1 mm to 1.0 mm. If the melting width is less than 0.1mm, on the one hand, it will increase the difficulty of the melting and fixing connection process, and it is difficult for the processing technology to achieve smaller size heating. Waterproof reliability is reduced. On the contrary, if the melting width is greater than 1.0mm, on the one hand, when the fusion fixing connection process is performed, the heating range is too large, which may damage other areas in the micro-sound device. On the other hand, the fusion fixing connection method is less than 1.0mm In this case, it can already meet the requirements of good waterproof performance, and there is no need to design the melting width too wide. Reducing the melting width can save space and reduce the volume of the micro-sounding device. Preferably, the melting width ranges from 0.15mm to 0.7mm.

Optionally, as shown in FIG. 3, the fixing portion 12 includes a flat portion 121 extending laterally outward from the folding ring portion. The flat portion 121 forms a fixed connection with the backing ring 21 to meet the requirement that the diaphragm 1 can be fixedly connected to the backing ring 21. The fixing portion 12 may also include other types of structures, which are not limited in the present invention.

Further optionally, in the embodiment shown in FIG. 3, the flat portion 121 and the backing ring 21 are fused and fixedly connected to form the fusion belt 10. The flat portion 121 can be fused to the upper surface of the backing ring 21, and this connection form has a simple structure and high sealing reliability. Preferably, the melting width of the melting zone 10 formed by the flat portion 121 ranges from 0.1 mm to 0.7 mm. The melting width refers to the width extending in the transverse direction. Using the connection form shown in Fig. 3, when the melting width is less than or equal to 0.7mm, higher waterproof and sealing requirements can be met.

Optionally, the fixing portion 12 may further include a flange 122. In the embodiment shown in FIG. 4, the fixing part includes a flat part 121 and a flange 122. The flange 122 is a structure formed by extending longitudinally from the edge of the planar portion 121. The flat portion 122 can be fused and fixedly connected with the upper surface of the backing ring 21. It can also adopt other forms of fixed connection such as bonding, which is not limited by the present invention. The flange 122 extends to the side surface of the backing ring 21 and forms a fusion fixed connection with the side surface of the backing ring 21. In the embodiment shown in FIG. 4, the flat part 121 and the flange 122 can form a semi-enclosed wrapping connection relationship with the backing ring 21, the flat part 121 is fixed on the upper surface of the backing ring 21, and the folding The edge 122 is fixed on the side surface of the backing ring 21. Through this structural design, the connection reliability and waterproof performance between the diaphragm and the housing assembly have been significantly improved. The waterproof performance can meet the waterproof performance level requirements of most miniature sound generating devices.

In the embodiment in which the fusion belt 10 is formed only by the flange 122 and the backing ring 21, the fusion width refers to the width of the fusion belt 10 in the longitudinal direction. Preferably, the melting width ranges from 0.2 mm to 1.0 mm. If the fusion zone 10 formed by the flange 122 is too narrow, on the one hand, it will be difficult to effectively improve the waterproof performance of the micro-sound device. On the other hand, when the diaphragm is assembled on the housing assembly, it will be turned over. The edge 122 is prone to wrinkles and other problems, and it is difficult to lay flat on the side wall of the housing assembly. On the contrary, if the fusion zone 10 formed by the flanging 122 is too wide, on the one hand, it will increase the difficulty of forming the diaphragm. On the other hand, the flanging will occupy too much space. During the process of fusing and fixing the connection, the high temperature radiation The area is large, which may cause high-temperature damage to other parts of the micro-sounding device.

Preferably, in the embodiment shown in FIG. 4, both the flat portion 121 and the flange 122 can be fused and fixedly connected with the housing assembly 2 to form an integral fusion belt 10. In this embodiment, the fusion zone may have an L-shaped cross section. The melting width includes a transversely extending part and a longitudinally extending part, and the melting width is preferably 0.2mm-1.0mm.

Preferably, the flange 122 can also be fused and fixedly connected with the backing ring 21 by means of laser melting. While performing the laser melting process on the fixing portion 12 and the backing ring 21, a laser can also be applied to the position of the flanging 122, so as to heat and melt the flanging 122 and the backing ring 21 covered by it. The flange 122 and the backing ring 21 form a fusion fixed connection. The advantage of this embodiment is that the flanging can be melted and fixed while the flat portion is melted and fixed, and the processing process is simple, and the required processing steps will not increase. Moreover, since the flat portion and the flange are surrounded by the corners of the backing ring, the fusion and fixed connection can be quickly realized by one-time laser melting, which can reduce the possibility of sound softening and deformation of the housing assembly and prevent abnormal structural stability.

In another embodiment, as shown in FIG. 5, the fixing portion 12 may only include a longitudinally extending flange 122, and the flange 122 is directly connected to the folding ring portion 11 and extends along the longitudinal direction. The flange 122 is fused and fixedly connected with the side surface of the housing assembly 2 to form the fusion belt 10. The advantage of this embodiment is that the fixed portion 12 occupies less lateral space of the micro-sounding device. Optionally, as shown in FIG. 5, the backing ring 21 may have an inner edge, and the flange 122 extends downward to form a fusion fixed connection with the inner edge of the backing ring 21. This design can completely prevent the fixing part from extending to the outer edge of the micro-sounding device. Optionally, in another embodiment, the flange 122 may also extend to the outer side wall of the backing ring 21, similar to the embodiment shown in FIG. 4, except that the plane portion 121 shown in FIG. 4 is eliminated.

The miniature sound generating device may also include components such as a voice coil 3, a centering support piece 4, and a magnetic circuit system, as shown in Figs. 3 and 4. The magnetic circuit system is arranged in the housing assembly and is used to generate a magnetic field. The voice coil 3 may be connected to the diaphragm or centering support piece 4. The voice coil 3 is located inside the housing assembly, and is suspended in the magnetic field generated by the magnetic circuit system. When there is a sound signal in the voice coil, the voice coil can vibrate under the action of the magnetic field. Further, the voice coil can drive the voice coil and the centering piece to vibrate, and the voice coil vibrates to generate sound. A part of the structure of the centering support piece may form a fixed connection with the fixing part, and the other part may form a connection with the inside of the area surrounded by the folding ring part through a cantilever. In this way, a part of the structure of the centering brace is fixed in the miniature sounding device, and the other part can vibrate with the diaphragm and the voice coil. The centering support piece can restrain the polarization and stabilize the vibration of the voice coil and the vibration of the diaphragm.

The present invention also provides an electronic product. The electronic product may be a mobile phone, a computer, a headset, a VR headset, a smart watch, etc., which is not limited by the present invention. The electronic product includes the main body of the electronic product and the above-mentioned micro-sounding device. The micro-sounding device is arranged in the main body of the electronic product. The micro-sounding device is electrically connected with the signal connector in the main body of the electronic product to conduct the sound signal into the micro-sounding device to realize vibration and sound.

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 miniature sounding device, characterized in that it comprises:

A vibrating component, the vibrating component comprising a diaphragm, the diaphragm having a folded ring portion and a fixed portion, the folded ring portion extends in a ring shape, and the fixed portion is formed around the periphery of the folded ring portion;

A housing assembly, the housing assembly includes a main housing and a backing ring, the backing ring is sealingly connected to the main housing, the diaphragm is arranged on the backing ring, and the fixing part is connected to the backing ring. The backing ring is fused and fixedly connected to form a melting band, and the difference between the melting temperature of the backing ring and the melting temperature of the diaphragm is less than 60 degrees Celsius.
The miniature sounding device according to claim 1, wherein the fixing part and the backing ring are fused and fixedly connected by laser hot melting.
The miniature sound emitting device of claim 2, wherein the temperature range of the laser melting is 120 degrees Celsius to 450 degrees Celsius.
The miniature sound emitting device according to claim 1, wherein the material of the backing ring is at least one of polycarbonate plastic, polyphthalamide plastic, and polyether plastic with phenylsulfide groups.
The miniature sound emitting device according to claim 1, wherein the material of the diaphragm is at least one of polyether ether ketone plastic, polyarylate plastic, and thermoplastic polyester rubber.
The miniature sound emitting device of claim 1, wherein the melting temperature of the main housing is greater than the melting temperature of the diaphragm and the backing ring by 60 degrees Celsius.
The miniature sound emitting device of claim 1, wherein the backing ring and the main housing are integrally formed by an integral injection molding process.
The miniature sound emitting device according to claim 1, wherein the fixing part comprises a flat part extending outwardly from the folding ring part in a lateral direction, and the flat part is fixedly connected to the backing ring.
8. The miniature sound emitting device according to claim 8, wherein the fixing part comprises a flange extending longitudinally from the plane part, and the flange is fused and fixedly connected to the side surface of the backing ring.
An electronic product, characterized in that it includes:

The main body of electronic products;

The micro-sounding device according to any one of claims 1-9, the micro-sounding device is arranged in the main body of the electronic product, and the micro-sounding device forms an electrical connection with the signal connector in the main body of the electronic product.