Disclosure of Invention
It is an object of the present invention to provide an improved miniature sound generating device.
According to a first aspect of the present invention, there is provided a miniature sound generating apparatus comprising:
the vibration component comprises a vibration film, the vibration film is provided with a folded ring part and a fixed part, the folded ring part extends in an annular shape, and the fixed part is formed around the periphery of the folded ring part;
the vibrating diaphragm is arranged on the shell assembly, the fixing portion is fixedly connected with the shell assembly in a melting mode to form a melting belt, the width of the melting belt is the melting width, and the range of the melting width is 0.1mm-1.0 mm.
Optionally, the fixing portion and the housing assembly are fused and fixedly connected in a laser hot melting mode.
Optionally, the temperature range of the laser hot melt is 120-450 degrees celsius.
Optionally, the material of the housing component is at least one of polycarbonate plastic, polyphthalamide plastic and polyether plastic with a benzene sulfide group.
Optionally, the material of the diaphragm is at least one of polyetheretherketone plastic, polyarylate plastic, and thermoplastic polyester rubber.
Optionally, a difference between a melting temperature of a portion of the structure of the housing assembly forming the melting zone with the diaphragm and a melting temperature of the diaphragm is less than 100 degrees celsius.
Optionally, the miniature sound generating apparatus ofclaim 1, wherein the fixing portion comprises a planar portion extending laterally outward from the folded ring portion, the planar portion being fixedly connected to the housing assembly.
Optionally, the planar portion and the shell assembly are fixedly connected in a melting mode to form the melting belt, and the melting width ranges from 0.1mm to 0.7 mm.
Optionally, the fixing portion includes a flange extending longitudinally from the planar portion, the flange is fused and fixedly connected with a side surface of the housing assembly to form the fusion zone, and the fusion width ranges from 0.2mm to 1.0 mm.
Optionally, the fixing portion includes a flange extending longitudinally from the flange portion, the flange is fused and fixedly connected with a side surface of the housing assembly to form the fusion zone, and the fusion width ranges from 0.2mm to 1.0 mm.
Another aspect of the present invention also provides an electronic product, including:
an electronic product body;
above-mentioned miniature sound generating mechanism, miniature sound generating mechanism sets up in the electronic product main part, miniature sound generating mechanism with signal connection spare in the electronic product main part forms the electricity and connects.
The invention has the technical effect that the waterproof performance between the vibrating diaphragm and the shell component in the miniature sound generating device is obviously improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
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 those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The invention provides an improved miniature sound generating device which comprises a vibration component and a shell component. The vibration assembly includes a diaphragm. The vibration component is a component which can vibrate and realize the sound production function in the miniature sound production device, and the vibration component can also comprise components such as a voice coil and the like, and the invention does not limit the components.
Wherein, the vibrating diaphragm can drive the air vibration and then produce sound at the vibration in-process. As shown in fig. 1 and 2, thediaphragm 1 has abending part 11 and afixing part 12. Thebending ring part 11 is of a bending structure and extends into an annular structure. Theannular portion 11 and the region surrounded by theannular portion 11 are portions capable of vibrating up and down. Thefixing portion 12 is formed around the foldedring portion 11, and thefixing portion 12 is a portion fixedly connected to other components of the miniature sound generating device.
Casing subassembly 2 is arranged in bearing other parts among vibration subassembly and the miniature sound generating mechanism,casing subassembly 2 constitutes miniature sound generating mechanism's main body frame, and parts such as voice coil loudspeaker voice coil, magnet can be held to its inside. Meanwhile, the upper structure of thehousing component 2 is used for forming a fixed connection with thediaphragm 1, and is used for bearing thediaphragm 1.
As shown in fig. 3, thediaphragm 1 is disposed on thehousing assembly 2, and thefixing portion 12 is in a heat-melting fixed connection with thehousing assembly 2, so as to form amelting strip 10. Thefixing portion 12 and thehousing assembly 2 are fused and fixed to form an integral structure, and the two have good connection tightness and sealing performance.
The portion of thefixing portion 12 where thefusion zone 10 is formed is integrated with thecase assembly 2. Themelt ribbon 10 is a ribbon-like structure having a melt width. Preferably, the melt width is in the range of 0.1mm to 1.0 mm. If the melting width is smaller than 0.1mm, on one hand, difficulty is increased for a melting and fixing connection process, and a processing process is difficult to realize smaller-sized heating, and on the other hand, the waterproof reliability between the vibratingdiaphragm 1 and theshell assembly 2 is reduced due to the excessively small melting width. On the other hand, if the fusion width is greater than 1.0mm, on the one hand, the range of heating is too large when the fusion fixation connection process is performed, which may damage other areas in the micro sound device, and on the other hand, the width of the fusion fixation connection mode is less than 1.0mm, which can meet the requirement of good waterproof performance, and the fusion width does not need to be designed to be too wide. The reduction of the melting width can save space and reduce the volume of the miniature sound production device. Preferably, the melt width is in the range of 0.15mm to 0.7 mm.
Through the sealing connection process of melting fixed connection, the waterproof effect of vibrating diaphragm and casing subassembly obtains showing and promotes, and this kind of waterproof process reduces by a wide margin for the shared space of traditional rubber coating waterproof process, also descends by a wide margin to the use amount of waterproof glue, and then has reduced miniature sound generating mechanism's manufacturing cost. On the other hand, miniature sound generating mechanism's structural reliability has also obtained the promotion, in the life-span experiment in later stage, also be difficult for appearing the fracture scheduling problem between vibrating diaphragm and the casing subassembly, and both realize inseparable, reliable fixed connection.
According to the technical scheme, by controlling the size of the melting width, the waterproof performance can be met, the space occupation can be effectively controlled, and the performance and structural requirements of electronic products on the miniature sound generating device are met.
Optionally, the fixing portion is fixedly connected with the housing assembly in a laser melting manner. The surface of the shell component and the fixed part of the diaphragm can be melted by local and instantaneous high temperature generated by laser, so that the surface of the shell component and the fixed part of the diaphragm are melted together. After laser irradiation is cancelled, the melting zone can be cooled down fast and the surface of the rear fixing part and the shell assembly forms an integrated adhesion structure, so that good fixed connection and waterproof sealing effects are achieved. The laser melting process has the characteristics of short heating time, accurate heating temperature and concentrated heating area, can meet the requirement of melting and connecting the fixing part and the shell assembly, and can effectively reduce the risk of heating and damaging other parts of the miniature sound generating device. On the other hand, when the miniature sound production device is subjected to reliability and service life tests, the temperature of the high-temperature endurance test is far lower than that of a laser melting process, the fixing part and the shell assembly cannot be melted, and the problems that the vibrating diaphragm and the shell assembly are cracked and separated are solved.
Optionally, the temperature range of the laser melting is 120-450 ℃. For the material of the diaphragm and the housing assembly, a material having a melting temperature within the above temperature range may be selected. In this way, when the region where the fixing portion and the housing module overlap each other is irradiated with the laser beam, the fixing portion and the housing module can be melted after the temperature of the region rises to the region. The preferable temperature range can protect other parts of the miniature sound generating device on one hand, and the risk of being damaged by high temperature is reduced; on the other hand, the fixing part and the shell assembly can be fused and cooled as soon as possible, the processing time is shortened, and the fixing part and the shell assembly form a fusion belt with clear and tidy boundary.
Preferably, theshell component 2 is made of a material having a melting temperature close to that of the diaphragm, and preferably, the difference between the melting temperature of the shell component and the melting temperature of the diaphragm is less than 100 ℃. Like this, when carrying out hot melt fixed connection to vibratingdiaphragm 1 andcasing subassembly 2, control the hot melt temperature easily, moreover, need not to promote the melting temperature to too high temperature, avoid causing the harm to other parts of miniature sound generating mechanism. When the temperature of the hot melt is raised to an appropriate temperature, the housing assembly and the fixing portion can be melted at the same time.
By selecting the materials of the shell component and the vibrating diaphragm and designing the structure of the shell component, the difference between the melting temperature of the part of the structure of the melting band formed by the vibrating diaphragm and the melting temperature of the vibrating diaphragm on the shell component is controlled within the range of 100 ℃, so that the melting and fixing connection process can be executed by using the proper melting temperature.
For example, the material of the housing component may be at least one of polycarbonate plastic, polyphthalamide plastic, polyether plastic with phenylthio. Firstly, the materials have proper melting temperature, and when the shell assembly is heated to the melting temperature of the materials, other parts of the miniature sound generating device are not easily damaged or failed under the influence of temperature. Second, these materials have relatively excellent melt connectivity and relatively close melting temperatures to the diaphragm. Since the diaphragm needs to have good elastic deformation and vibration sound production performance, the material used for the diaphragm is limited by acoustic performance. The preferable material for the shell assembly can be well fused and connected with the material of the vibrating diaphragm, the melting temperature of the material is close to that of the material of the vibrating diaphragm, and under the condition that the shell assembly is made of the material, the fusion, fixation and connection process is easier to achieve, and the reliability is higher.
Optionally, the material of the diaphragm may be at least one of polyetheretherketone plastic, polyarylate plastic, and thermoplastic polyester rubber. The vibrating diaphragm made of the material can show good acoustic performance, and the elastic deformation capacity can meet the sound production requirement of the miniature sound production device. Furthermore, the material is easier to form fusion fixation connection with other plastic materials, and has higher compatibility.
Preferably, the material of the diaphragm may be selected to be a light-transmitting material, and the material of the housing assembly may be selected to be a light-absorbing material. When the fixing portion and the housing assembly are fixedly connected by laser melting, the fixing portion covers the housing assembly, and therefore, the laser needs to apply heat radiation to the housing assembly through the fixing portion. And if the material with the vibrating diaphragm selects for the printing opacity material, then the laser can see through the fixed part penetrates directly to on the casing subassembly, better messenger's casing subassembly surface rapid heating melts. Further, if the material of the housing assembly is selected to be a light absorbing material, other components located around the housing assembly will not be irradiated by the laser, and the direct heat radiation is greatly reduced. The design mode can provide temperature protection for structures except the fixed part of the diaphragm and the shell assembly, and the possibility that other structures are subjected to direct laser heat radiation is reduced. Moreover, by designing the light-transmitting vibrating diaphragm, the fixing part and the partial structure of the shell component covered by the fixing part can be heated and melted together quickly, so that the effect of quick melting is realized, and then the shell component is cooled quickly to form melting and fixing connection.
Alternatively, as shown in fig. 3, the fixingportion 12 includes aflat portion 121 extending laterally outward from the loop portion. The plane portion with the casing subassembly forms fixed connection to satisfy vibratingdiaphragm 1 can the demand of fixed connection on the casing subassembly. The fixing portion may also include other structures, and the invention is not limited thereto.
Further alternatively, in the embodiment shown in fig. 3, theplanar portion 121 is fixedly fused to thehousing assembly 2 to form thefusion belt 10. Theplane portion 121 can be fused and connected with the upper surface of thehousing assembly 2, and the connection form is simple in structure and high in sealing reliability. Preferably, theflat portion 121 forms a melt width of themelt ribbon 10 in the range of 0.1mm to 0.7 mm. The melt width refers to a width extending in the lateral direction. By adopting the connection form shown in fig. 3, the higher waterproof and sealing requirements can be met under the condition that the melting width is less than or equal to 0.7 mm.
Optionally, the fixingportion 12 may further include aflange 122. In the embodiment shown in fig. 4, the fixing portion includes aflat portion 121 and aflange 122. The burring 122 is a structure formed to extend in the longitudinal direction from the edge of theplanar portion 121. Theplane portion 121 is fixedly connected to the upper surface of thehousing assembly 2, and may be in a form of fusion fixing connection, or may be in other forms of fixing connection such as bonding, which is not limited in the present invention. Theflange 122 extends to the side of thehousing component 2, and forms a melt-fastening connection with the side of thehousing component 2. In the embodiment shown in fig. 4, theplanar portion 121 and theflange 122 can form a semi-surrounding wrapping connection relationship with thehousing component 2, theplanar portion 121 is fixed on the upper surface of thehousing component 2, and theflange 122 is fixed on the side surface of thehousing component 2. Through this kind of structural design, the connection reliability and the waterproof performance between vibrating diaphragm and the casing subassembly obtain further showing and promote. The waterproof performance can satisfy the waterproof performance grade requirement of most miniature sound generating devices.
In the embodiment where thefusion tape 10 is formed only with theflange 122 and thecase assembly 2, the fusion width refers to the width of thefusion tape 10 in the longitudinal direction. Preferably, the melt width is in the range of 0.2mm to 1.0 mm. If themelting band 10 formed by the turned-upedge 122 is too narrow, it is difficult to substantially improve the waterproof performance of the miniature sound-generating device, and on the other hand, when the diaphragm is assembled on the housing assembly, the turned-upedge 122 is prone to have problems such as wrinkles and the like, and is difficult to be laid on the side wall of the housing assembly. On the contrary, if the width of themelting band 10 formed by theflange 122 is too wide, on the one hand, the difficulty of forming the diaphragm is increased, and on the other hand, the space occupied by the flange is too large, and when the process of melting and fixing connection is performed, the area of high-temperature radiation is large, and high-temperature damage may be caused to other parts of the miniature sound generating device.
Preferably, in the embodiment shown in fig. 4, theflat portion 121 and theflange 122 are both connected to thehousing assembly 2 by fusing to form anintegral fusion strip 10. In such an embodiment, the molten ribbon may be L-shaped in cross-section. The melt width includes a laterally extending portion and a longitudinally extending portion, and the melt width is preferably 0.2mm to 1.0 mm.
Preferably, theflange 122 may also be formed in a fusion-fixed connection with thehousing component 2 by means of laser fusion. While the fixingportion 12 and thehousing assembly 2 are subjected to a laser melting process, laser may be applied to the position of theflange 122, so as to heat and melt theflange 122 and the structure of the portion of the housing assembly covered by theflange 122, thereby forming a melting and fixing connection between theflange 122 and the housing assembly. The embodiment has the advantages that the melt fixation of the flanging can be realized while the melt fixation of the plane part is performed, the process of the processing technology is simple, and the required processing steps are not increased. Moreover, because plane portion and turn-ups surround the corner position at casing unit, realize melting fixed connection fast through laser melting once, can reduce casing unit sound production and soften, the possibility of deformation, prevent that structural stability from appearing unusually.
In another embodiment, as shown in fig. 5, the fixingportion 12 may include only alongitudinally extending flange 122, and theflange 122 is directly connected to thehinge portion 11 and extends in the longitudinal direction. Theflanges 122 are fixedly fused to the sides of thehousing assembly 2 to form thefusion zone 10. This embodiment has the advantage that the fixingportion 12 occupies less lateral space of the miniature sound generating device. Alternatively, as shown in fig. 5, theshell component 2 may be formed with an inner edge, and theflange 122 extends downward to form a melt-fixed connection with the inner edge of the top of theshell component 2. The design can completely prevent the fixing part from extending to the edge of the miniature sound production device. Alternatively, in another embodiment, theflange 122 may also extend to the outer side wall of thehousing assembly 2, similar to the embodiment shown in fig. 4, and theflat portion 121 shown in fig. 4 is eliminated.
The miniature sound generating device can also comprise avoice coil 3, a centeringsupport 4, a magnetic circuit system and other components, as shown in fig. 3 and 4. The magnetic circuit system is disposed within the housing assembly for generating a magnetic field. Thevoice coil 3 may be attached to the diaphragm orspider 4. Thevoice coil 3 is located inside the housing assembly, suspended within the magnetic field generated by the magnetic circuit system. When sound signals are introduced into 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 support piece to vibrate, and the voice coil vibrates to produce sound. A part of the structure of the centering branch piece can be fixedly connected with the fixing part, and the other part of the structure is connected with the inside of the area surrounded by the folding ring part through the cantilever. In this way, a part of the structure of the centering support is fixed in the miniature sound production device, and the other part of the structure can vibrate along with the vibrating diaphragm and the voice coil. The centering support piece can play the roles of restraining polarization and stabilizing vibration of the voice coil and the vibrating diaphragm.
The invention also provides an electronic product which can be a mobile phone, a computer, an earphone, VR head-wearing equipment, an intelligent watch and the like, and the invention does not limit the electronic product. The electronic product comprises an electronic product main body and the miniature sound production device. The miniature sound generating device is arranged in the electronic product main body. The miniature sound generating device is electrically connected with the signal connecting piece in the electronic product main body to conduct the sound signal into the miniature sound generating device to realize vibration sound generation.
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 may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.