Waterproof sound transmission film, microphone, acoustic performance adjusting method and electronic equipment
By using a waterproof and sound-permeable membrane made of fluorine-free fibers in the microphone and combining a quality adjusting part to reduce the natural frequency, the problem of poor acoustic performance of traditional waterproof microphones is solved, achieving both waterproof and acoustic performance.
Patent Information
- Application Number
- CN202411907720.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-05-02
AI Technical Summary
While ensuring waterproof performance, traditional waterproof microphone structures often affect sound transmission, resulting in poor acoustic performance, especially in outdoor or humid environments.
A waterproof and sound permeable membrane is used, including a film body made of fluorine-free fibers and a mass adjusting member connected to the film body. By adjusting the mass distribution, the natural frequency of the waterproof sound-permeable film is reduced to the audio frequency range, thereby improving acoustic performance.
It achieves the improvement of the acoustic performance of the microphone while ensuring waterproof performance, ensuring efficient sound transmission, and is suitable for outdoor or humid environments.
Smart Images
Figure CN119922472A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic products, and more specifically, to a waterproof sound-permeable membrane, a microphone, an acoustic performance adjustment method and an electronic device. Background Art
[0002] With the development of science and technology and the improvement of living standards, various electronic products have gradually entered thousands of households and become people's daily necessities; people's requirements for the performance of electronic products are also getting higher and higher.
[0003] In many electronic devices, microphones are key components for sound collection, and their performance directly affects the device's voice call quality, recording quality, and voice recognition accuracy. Especially in outdoor or humid environments, waterproof performance becomes an important consideration in microphone design. However, traditional waterproof structures often hinder sound transmission, thus affecting the acoustic performance of the microphone.
[0004] Therefore, how to ensure the efficient transmission of sound while ensuring the waterproof performance of the microphone has become a technical problem that needs to be solved urgently. Summary of the invention
[0005] One purpose of the present application is to provide a new technical solution for a waterproof sound-permeable membrane, a microphone, an acoustic performance adjustment method and an electronic device.
[0006] According to a first aspect of the present application, there is provided a waterproof sound-permeable membrane, the waterproof sound-permeable membrane comprising:
[0007] A membrane body, wherein the membrane body is made of fluorine-free fiber;
[0008] A mass adjusting member, wherein the mass adjusting member is connected to the membrane body, the outline size of the mass adjusting member is smaller than the outline size of the membrane body, the outline shape of the mass adjusting member is the same as the outline shape of the membrane body, and the mass adjusting member is located in the middle of the membrane body; the mass adjusting member is configured to adjust the mass distribution of the membrane body so that the natural frequency of the waterproof sound-permeable membrane is lower than the natural frequency of the membrane body.
[0009] Optionally, the mass adjustment member is a solid structure; or, the mass adjustment member is an annular structure; or, the mass adjustment member is a mesh structure.
[0010] Optionally, the mass adjusting member is adhesively connected to the membrane body.
[0011] Optionally, the mass adjustment member has a discrete distribution structure.
[0012] Optionally, the mass adjustment member is bonded to the membrane body by a deposition process.
[0013] Optionally, the outline size of the mass adjustment member is one third of the outline size of the membrane body.
[0014] Optionally, the waterproof sound-permeable membrane further includes a supporting frame, and an edge of the membrane body is bonded to the supporting frame.
[0015] According to a second aspect of the present application, a microphone is provided, the microphone comprising the waterproof sound-permeable membrane as described in the first aspect, the microphone having a sound hole, and the waterproof sound-permeable membrane is arranged to cover the sound hole.
[0016] According to a third aspect of the present application, there is provided an acoustic performance adjustment method, the acoustic performance adjustment method being used to adjust the acoustic performance of the microphone according to the second aspect, the acoustic performance adjustment method comprising:
[0017] The waterproof sound-permeable membrane resonates with the cavity inside the sound hole, thereby improving the effect of the microphone chip inside the sound hole in receiving external sound waves.
[0018] According to a fourth aspect of the present application, an electronic device is provided, comprising the microphone as described in the second aspect.
[0019] The waterproof sound-permeable membrane provided in the embodiment of the present application connects the mass adjustment part to the membrane body, which can change the mass distribution of the membrane body, so that the waterproof sound-permeable membrane composed of the membrane body and the mass adjustment part has a natural frequency far lower than the membrane body itself, and the natural frequency of the waterproof sound-permeable membrane is reduced to the audio frequency range; thus, in addition to the protective function of a general waterproof sound-permeable membrane, the waterproof sound-permeable membrane also has better acoustic performance.
[0020] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.
[0022] Figure 1a This is a structural schematic diagram 1 of a waterproof sound-permeable membrane according to an embodiment of the present application;
[0023] Figure 1b This is a schematic diagram of the structure of a waterproof sound-permeable membrane according to an embodiment of the present application. Figure 2 ;
[0024] Figure 1c is a third structural schematic diagram of a waterproof sound-permeable membrane according to an embodiment of the present application;
[0025] Figure 1d Schematic diagram 4 of the structure of a waterproof sound-permeable membrane according to an embodiment of the present application;
[0026] Figure 2 is a schematic structural diagram of a microphone according to an embodiment of the present application.
[0027] Description of reference numerals:
[0028] 1. Waterproof sound-permeable membrane; 11. Membrane body; 12. Quality adjustment member; 13. Support frame;
[0029] 2. Substrate; 200. Sound hole; 3. Shell; 4. Microphone MEMS chip; 40. Cavity; 5. ASIC chip. DETAILED DESCRIPTION
[0030] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, 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 application.
[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.
[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.
[0033] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.
[0034] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0035] Reference Figure 1a to Figure 1d As shown, according to one embodiment of the present application, a waterproof sound-permeable membrane 1 is provided. The waterproof sound-permeable membrane 1 comprises a membrane body 11, the membrane body 11 is made of fluorine-free fiber; and further comprises a mass adjustment member 12, the mass adjustment member 12 is connected to the membrane body 11, the outline size of the mass adjustment member 12 is smaller than the outline size of the membrane body 11, the outline shape of the mass adjustment member 12 is the same as the outline shape of the membrane body 11, and the mass adjustment member 12 is located in the middle of the membrane body 11; the mass adjustment member 12 is configured to adjust the mass distribution of the membrane body 11 so that the natural frequency of the waterproof sound-permeable membrane is lower than the natural frequency of the membrane body 11.
[0036] In the waterproof and sound-permeable membrane 1 provided in the embodiment of the present application, the membrane body 11 is made of nano-scale fluorine-free fibers through an electrospinning process. It does not contain fluorine-based polymers and therefore has high environmental performance. In addition, it has good waterproof and breathable capabilities. Attaching it to the hole structure of an electronic product can prevent external moisture from entering the interior of the electronic product and causing damage to the internal devices of the electronic product.
[0037] However, since the material used to make the membrane body 11 has a low density and a low mass, the natural frequency of the membrane body 11 is relatively high (approximately 20KHz), so the resonance point of the membrane body 11 itself is relatively high and it is difficult to vibrate; when the membrane body 11 is applied to acoustic equipment such as a microphone, the high natural frequency and poor vibration ability make it difficult for the membrane body 11 to produce good acoustic performance.
[0038] Therefore, in the waterproof sound-permeable membrane 1 provided in the embodiment of the present application, in addition to the membrane body 11, a mass adjustment member 12 is also included, and the mass adjustment member 12 is connected to the membrane body 11; the mass adjustment member 12 is made of high-density materials, such as metal materials such as steel, iron, copper, or non-metallic materials such as plastic, silicon, and fluororubber. Since the mass adjustment member 12 has a mass density much higher than that of the membrane body 11, the mass distribution of the membrane body 11 can be changed after the mass adjustment member 12 is connected to the membrane body 11. Specifically, the mass adjustment member 12 is located in the middle of the membrane body 11, so that the mass distribution in the middle of the membrane body 11 can be increased, that is, a larger mass distribution is gathered in the middle of the membrane body 11; therefore, the waterproof sound-permeable membrane 1 composed of the membrane body 11 and the mass adjustment member 12 can have a natural frequency much lower than that of the membrane body 11 itself. After measurement, the natural frequency of the membrane body 11 alone is about 20KHz, while the natural frequency of the waterproof sound-permeable membrane 1 with the mass adjustment member 12 added is about 7500Hz. It can be seen that the natural frequency of the waterproof sound-permeable membrane 1 can be significantly reduced to the audio frequency range by connecting the mass adjustment member 12 to the membrane body 11. Therefore, the waterproof sound-permeable membrane 1 provided in the embodiment of the present application not only has the protective function of a general waterproof sound-permeable membrane, but also has good acoustic performance. When it is applied to a microphone, it can improve the acoustic performance of the microphone.
[0039] In addition, in the waterproof sound-permeable membrane 1 provided in the embodiment of the present application, the outline size of the mass adjustment member 12 is smaller than the outline size of the membrane body 11, the outline shape of the mass adjustment member 12 is the same as the outline shape of the membrane body 11, and the mass adjustment member 12 is located in the middle of the membrane body 11; thus, at least on the outside of the mass adjustment member 12, the waterproof sound-permeable membrane 1 has an annular area that only includes the membrane body 11, and the annular area has a regular shape and uniform size; thus, a uniform and effective sound transmission effect can be ensured. For example, if the membrane body 11 is circular and the mass adjustment member 12 is also circular, the waterproof sound-permeable membrane 1 has an annular area that only includes the membrane body 11; for another example, if the membrane body 11 is rectangular and the mass adjustment member 12 is also rectangular, the waterproof sound-permeable membrane 1 has a rectangular annular area that only includes the membrane body 11.
[0040] In summary, in the waterproof sound-permeable membrane 1 provided in the embodiment of the present application, by adding a mass adjustment member 12 to the membrane body 11, its natural frequency can be reduced, the compliance of the waterproof sound-permeable membrane 1 can be improved, and its vibration amplitude can be increased.
[0041] Reference Figure 1a to Figure 1c As shown, in one embodiment, the mass adjustment member 12 is a solid structure; or, the mass adjustment member 12 is an annular structure; or, the mass adjustment member 12 is a mesh structure.
[0042] In this specific example, refer to Figure 1a As shown, the mass adjustment member 12 can be set as a solid structure; for example, a solid circular structure or a solid rectangular structure. In this way, the manufacturing process of the mass adjustment member 12 is relatively simple and it is easy to form a connection with the membrane body 11.
[0043] Or, refer to Figure 1b As shown, the mass adjustment member 12 can be set as an annular structure; for example, a circular ring structure or a rectangular ring structure. In this way, the waterproof sound-permeable membrane 1 only includes the membrane body 11 on the outside of the mass adjustment member 12, and the waterproof sound-permeable membrane 1 also only includes the membrane body 11 on the inside of the mass adjustment member 12; thereby, the sound transmission effect of the waterproof sound-permeable membrane 1 can be improved.
[0044] Or, refer to Figure 1c As shown, the mass adjustment member 12 can be set as a mesh structure; for example, a mesh structure with a circular outer contour or a mesh structure with a rectangular outer contour. In this way, in the mesh hollow structure of the mass adjustment member 12, the waterproof sound-permeable membrane 1 has an area that only includes the membrane body 11, so that the sound transmission effect of the waterproof sound-permeable membrane 1 is more uniform.
[0045] In one embodiment, the mass adjustment member 12 is adhesively connected to the membrane body 11 .
[0046] In this specific example, no matter the mass adjustment member 12 is set as a solid structure, an annular structure or a mesh structure, the mass adjustment member 12 can be bonded and connected to the membrane body 11, and its setting method is simple and easy to operate. In addition, the mass adjustment member 12 can be made by injection molding or 3D printing.
[0047] Reference Figure 1d As shown, in one embodiment, the mass adjustment member 12 is in a discrete distribution structure. The mass adjustment member 12 is bonded to the membrane body 11 by a deposition process.
[0048] In this specific example, the mass adjustment member 12 can be distributed as a point-like discrete structure in the middle area of the membrane body 11 through a deposition process; the mass adjustment member 12 of this structure has the smallest effect on the air permeability of the membrane body 11, thereby achieving the best sound transmission effect.
[0049] Reference Figure 1a to Figure 1d As shown, in one embodiment, the outline size of the mass adjustment member 12 is one third of the outline size of the membrane body 11 .
[0050] If the outline size of the mass adjustment member 12 is too small compared to the outline size of the membrane body 11, it is difficult for it to play a significant role in mass adjustment; and if the outline size of the mass adjustment member 12 is too large compared to the outline size of the membrane body 11, it will significantly affect the air permeability of the membrane body 11. Therefore, in this specific example, the outline size of the mass adjustment member 12 is set to one third of the outline size of the membrane body 11, so as to coordinate the mass adjustment effect of the mass adjustment member 12 and the effect on the air permeability of the membrane body 11.
[0051] Reference Figure 1a to Figure 1d As shown, in one embodiment, the waterproof sound-permeable membrane further includes a supporting frame 13 , and the edge of the membrane body 11 is bonded to the supporting frame 13 .
[0052] In this specific example, the support frame 13 is an annular structure with a hollow area in the middle, the edge of the membrane body 11 is bonded to the support frame 13, and the middle part of the membrane body 11 corresponds to the hollow area of the support frame 13. The support frame 13 can provide a stable and reliable support for the membrane body 11.
[0053] According to another embodiment of the present application, referring to Figure 2 As shown, a microphone is provided, the microphone comprising the waterproof sound-permeable membrane 1 as described above, the microphone having a sound hole 200 , and the waterproof sound-permeable membrane 1 is arranged to cover the sound hole 200 .
[0054] The microphone provided in the embodiment of the present application includes the waterproof sound-permeable membrane 1, which can not only prevent external moisture from entering the interior of the microphone and causing the microphone to fail; but also the microphone has excellent acoustic performance.
[0055] Specifically, the microphone includes a substrate 2 and a shell 3 connected to each other, and a sound hole 200 is opened in the substrate 2; the waterproof sound-permeable membrane 1 can be arranged on the outside of the substrate 2 or on the inside of the substrate 2. In addition, the microphone also includes a microphone MEMS chip 4 and an ASIC chip 5, and the microphone MEMS chip 4 and the ASIC chip 5 are both connected to the substrate 2. Among them, the microphone MEMS chip 4 has a cavity 40, and the cavity 40 and the sound hole 200 are arranged correspondingly. External sound waves enter the cavity 40 through the sound hole 200 and cause the diaphragm of the microphone MEMS chip 4 to vibrate, thereby achieving the effect of sound signal collection.
[0056] According to another embodiment of the present application, there is provided an acoustic performance adjustment method, the acoustic performance adjustment method being used to adjust the acoustic performance of the microphone as described above, the acoustic performance adjustment method comprising:
[0057] The waterproof sound-permeable membrane 1 resonates with the cavity inside the sound hole 200 , thereby improving the effect of the microphone chip inside the sound hole 200 in receiving external sound waves.
[0058] Specifically, the waterproof sound-permeable membrane 1 includes a membrane body 11 and a mass adjustment part 12, and has a natural frequency in the audio frequency range. When external sound waves pass through the waterproof sound-permeable membrane 1, the waterproof sound-permeable membrane 1 can vibrate within the audio frequency range and have a relatively high vibration amplitude; therefore, when external sound waves pass through the waterproof sound-permeable membrane 1 and reach the cavity 40 of the microphone MEMS chip 4 via the sound hole 200, the waterproof sound-permeable membrane 1 can resonate with the cavity 40, thereby improving the vibration effect of the diaphragm of the microphone MEMS chip 4 and achieving a better sound reception effect of the microphone MEMS chip 4.
[0059] According to the natural frequency that the waterproof sound-permeable membrane 1 needs to achieve, the material, size and shape of the mass adjustment member 12 can be adjusted to adjust the mass distribution, thereby adjusting the natural frequency of the waterproof sound-permeable membrane 1.
[0060] According to yet another embodiment of the present application, an electronic device is provided, wherein the electronic device includes the microphone as described above.
[0061] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.
[0062] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.
Claims
1. A waterproof sound-permeable membrane, characterized in that: The waterproof sound-permeable membrane comprises: A membrane body (11), wherein the membrane body (11) is made of fluorine-free fiber; A mass adjustment member (12), the mass adjustment member (12) is connected to the membrane body (11), the outline size of the mass adjustment member (12) is smaller than the outline size of the membrane body (11), the outline shape of the mass adjustment member (12) is the same as the outline shape of the membrane body (11), and the mass adjustment member (12) is located in the middle of the membrane body (11); the mass adjustment member (12) is configured to adjust the mass distribution of the membrane body (11) so that the natural frequency of the waterproof sound-permeable membrane is lower than the natural frequency of the membrane body (11).
2. The waterproof sound-permeable membrane according to claim 1, characterized in that: The mass adjustment member (12) is a solid structure; or, the mass adjustment member (12) is an annular structure; or, the mass adjustment member (12) is a mesh structure.
3. The waterproof sound-permeable membrane according to claim 2, characterized in that: The mass adjustment member (12) is bonded to the membrane body (11).
4. The waterproof sound-permeable membrane according to claim 1, characterized in that: The mass adjustment member (12) has a discrete distribution structure.
5. The waterproof sound-permeable membrane according to claim 4, characterized in that: The mass adjustment member (12) is bonded to the membrane body (11) through a deposition process.
6. The waterproof sound-permeable membrane according to any one of claims 1 to 5, characterized in that: The outline size of the mass adjustment member (12) is one third of the outline size of the membrane body (11).
7. The waterproof sound-permeable membrane according to any one of claims 1 to 5, characterized in that: The waterproof sound-permeable membrane further comprises a supporting frame (13), and the edge of the membrane body (11) is bonded to the supporting frame (13).
8. A microphone, characterized in that: The microphone comprises a waterproof sound-permeable membrane (1) according to any one of claims 1 to 7, the microphone has a sound hole (200), and the waterproof sound-permeable membrane (1) is arranged to cover the sound hole (200).
9. A method for adjusting acoustic performance, characterized in that: The acoustic performance adjustment method is used to adjust the acoustic performance of the microphone according to claim 8, and the acoustic performance adjustment method comprises: The waterproof sound-permeable membrane (1) resonates with the cavity inside the sound hole (200), thereby improving the effect of the microphone chip inside the sound hole (200) in receiving external sound waves.
10. An electronic device, characterized in that: The electronic device comprises the microphone as claimed in claim 8.