Microphone

Abstract

The utility model relates to a microphone which comprises a packaging shell with an inner cavity, and the packaging shell is provided with a sound hole for sound to flow into the inner cavity. A microphone single body is installed in the inner cavity, a front cavity close to one side of the sound hole is defined between the microphone single body and the packaging shell, and a rear cavity is formed in the microphone single body; and porous material pieces are arranged in the front cavity and the rear cavity. The microphone provided by the utility model can effectively improve the tone quality of the microphone and reduce noise interference.

Description

Technical Field

[0001] The utility model relates to the audio field, in particular to a microphone. Background Art

[0002] A dynamic microphone is a device that converts acoustic signals into electrical signals, and its working principle is based on the electromagnetic induction principle. It includes a voice coil, which is fixed on the diaphragm, and a permanent magnet with a very strong magnetic field is provided near the voice coil. When sound waves act on the diaphragm, the diaphragm generates mechanical vibrations, which drive the voice coil to vibrate in the magnetic field, thereby generating an electric current and converting the sound signal into an electrical signal. This conversion process does not require external power supply because the dynamic microphone works on the principle of generating current by the coil cutting the magnetic field.

[0003] However, in the process of sound transmission, traditional dynamic microphones often have problems such as poor sound quality and high noise. Therefore, how to optimize the structure of the microphone to improve sound quality and reduce noise has become an urgent problem to be solved currently. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a microphone that can effectively improve the sound quality of the microphone and reduce noise interference.

[0005] The purpose of the utility model is achieved as follows. A microphone includes a packaging shell with an inner cavity, and a sound hole for sound to flow into the inner cavity is opened on the packaging shell; a microphone element is installed in the inner cavity, and a front cavity close to the sound hole side is formed between the microphone element and the packaging shell, and a rear cavity is formed inside the microphone element; porous material pieces are provided in both the front cavity and the rear cavity.

[0006] In a preferred embodiment of the utility model, the porous material piece is a coating structure and is injected or sprayed on the inner walls of the front cavity and the rear cavity.

[0007] In a preferred embodiment of the utility model, the porous material piece is a sheet structure, a block structure or a film layer structure, and is adhesively fixed on the inner walls of the front cavity and the rear cavity.

[0008] In a preferred embodiment of the utility model, the porous material piece includes porous particles, and the porous particles are installed in a breathable bag and filled in the front cavity and the rear cavity.

[0009] In a preferred embodiment of the utility model, the porous material piece includes porous powder, and the porous powder is installed in a breathable bag and filled in the front cavity and the rear cavity.

[0010] In a preferred embodiment of the utility model, the microphone is a dynamic microphone.

[0011] In a preferred embodiment of the present utility model, the density of the porous material part is 0.3 - 0.5 g / cm3, and the porosity is 60 - 90%.

[0012] In a preferred embodiment of the present utility model, the encapsulation housing includes a sound-permeable cover plate, a fixed cylinder with both ends open, and a base. The two ends of the fixed cylinder are respectively connected to the sound-permeable cover plate and the base. The sound-permeable cover plate, the fixed cylinder, and the base enclose an inner cavity. The sound holes are opened on the sound-permeable cover plate. A front cavity is formed by enclosing between the microphone element, the fixed cylinder, and the sound-permeable cover plate.

[0013] In a preferred embodiment of the present utility model, a plurality of card slots are circumferentially provided on the inner wall of the fixed cylinder, and a plurality of clamping blocks are circumferentially provided on the outer wall of the microphone element. Each clamping block can be clamped in the corresponding card slot.

[0014] In a preferred embodiment of the present utility model, the sound-permeable cover plate includes an outer ring and a cross-shaped rod connected inside the outer ring. Four fan-shaped holes are formed between the cross-shaped rod and the outer ring, and the fan-shaped holes constitute the sound holes.

[0015] As described above, for the microphone of the present utility model, by providing porous material parts in both the front cavity and the rear cavity, the porous material parts have good porous and volume expansion effects, can effectively improve the sound quality performance of the microphone, enhance the sensitivity and signal-to-noise ratio, and fully optimize the user's auditory experience. Moreover, it has the advantages of simple structure and low manufacturing cost, and can be applied to various types of microphone products. Description of the Drawings

[0016] The following drawings are only intended to illustrate and explain the present utility model schematically, and do not limit the scope of the present utility model. Among them:

[0017] Figure 1 : is a schematic structural diagram of the microphone provided by the present utility model.

[0018] Figure 2 : is an exploded view of the microphone provided by the present utility model.

[0019] Explanation of the Reference Numerals in the Drawings:

[0020] 1. Encapsulation housing; 11. Sound holes; 12. Front cavity; 13. Sound-permeable cover plate; 131. Outer ring; 132. Cross-shaped rod; 14. Fixed cylinder; 141. Card slots; 15. Base;

[0021] 2. Microphone element; 21. Rear cavity; 22. Clamping blocks; 23. Installation gap;

[0022] 3. Porous material part. Detailed Embodiments

[0023] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific implementation manners of the present utility model will now be described with reference to the accompanying drawings.

[0024] As Figure 1 and Figure 2 shown, this embodiment provides a microphone, which includes a packaging shell 1 having an inner cavity, and a sound hole 11 for sound to flow into the inner cavity is formed in the packaging shell 1; a microphone element 2 is installed in the inner cavity, and a front cavity 12 is formed between the microphone element 2 and the packaging shell 1 near the sound hole 11, and a rear cavity 21 is formed inside the microphone element 2; porous material parts 3 are provided in both the front cavity 12 and the rear cavity 21.

[0025] Thus, in the microphone of this embodiment, by providing the porous material parts 3 in both the front cavity 12 and the rear cavity 21, the porous material parts 3 have good porous and expansion effects, can effectively improve the sound quality performance of the microphone, enhance the sensitivity and signal-to-noise ratio, and fully optimize the user's auditory experience. Moreover, it has the advantages of simple structure and low manufacturing cost, and can be applied to various types of microphone products.

[0026] In a specific implementation manner, the porous material part 3 can be a coating structure and is injected or sprayed on the inner walls of the front cavity 12 and the rear cavity 21 (it can be understood that when using the injection method, a syringe can be used to inject a paste or slurry on the inner wall of the cavity to form a coating structure). Alternatively, the porous material part 3 can also be a sheet structure, a block structure, or a film layer structure, and is adhesively fixed on the inner walls of the front cavity 12 and the rear cavity 21; for example, it can be fixed on the inner walls of the front cavity 12 and the rear cavity 21 through an adhesive or double-sided tape. Alternatively, the porous material part 3 can also include porous particles, and the porous particles are installed in a breathable bag and filled in the front cavity 12 and the rear cavity 21. Alternatively, the porous material part 3 can also include porous powder, and the porous powder is installed in a breathable bag and filled in the front cavity 12 and the rear cavity 21.

[0027] When the porous material part 3 adopts a sheet structure or a block structure, the signal-to-noise ratio and sensitivity of the microphone are the highest. When adopting porous particles or porous powder, the signal-to-noise ratio and sensitivity of the microphone are the second highest. When adopting a film layer structure or a coating structure, they are the lowest. The specific form and fixing method of the porous material part 3 can be determined according to actual needs, and this embodiment is only for illustrative purposes.

[0028] In some embodiments, the porous material piece 3 contains a porous material, which is a combination of one or more of zeolite, activated carbon, MOF, COF, aerogel, hydrogel, etc. Preferably, the porous material piece 3 contains zeolite. When using zeolite, the corresponding signal-to-noise ratio and sensitivity are better than when using activated carbon. Further optionally, the porous material piece 3 also includes a combination of one or more of a foaming material (such as open-cell foam, which is used to absorb high-frequency sound waves and reduce the reflection of sound waves), a fiber material (such as glass fiber, rock wool, etc., which has good porous properties and heat resistance), and an elastic material, etc. These materials have good porous properties, low reflectivity, and good damping properties, and can effectively absorb and disperse sound wave energy, reducing the reflection and resonance of sound waves in the front cavity 12 and the rear cavity 21, and significantly improving the sound quality performance of the microphone. In addition, when selecting a porous material, a porous material with high internal resistance and low density should be selected, which has better porosity and sound insulation effects, and can more effectively reduce the reflection and resonance of sound; at the same time, the material also has high mechanical strength and stability, can resist external impacts and vibrations, and extend the service life of the microphone.

[0029] By filling the front and rear cavities with the porous material piece 3 with excellent acoustic and mechanical properties, the sound quality and durability of the microphone are improved, the noise interference is reduced, and the user experience is enhanced.

[0030] The density and thickness of the material can be adjusted according to actual needs to achieve the best sound quality effect, so as to adapt to different application scenarios. In this embodiment, the density of the porous material piece 3 is 0.3 - 0.5 g / cm 3 , and the porosity is 60 - 90%.

[0031] To better illustrate the effect of the microphone of the present invention, the following conducts signal-to-noise ratio and sensitivity tests on several specific embodiments with the above-mentioned porous material piece 3 provided in the front cavity 12 and the rear cavity 21, and two blank comparative examples where no porous material piece 3 is provided in both the front and rear cavities and only a porous material piece 3 is provided in the rear cavity, respectively, for further comparative illustration, as follows:

[0032] Example 1

[0033] The porous material pieces 3 in the front cavity 12 and the rear cavity 21 are porous particles and porous powder respectively, which are filled in the front cavity 12 and the rear cavity 21 after being filled in a breathable bag. The materials of the porous particles and the porous powder are zeolite. The average diameter of the porous particles is 50 μm, and the average diameter of the porous powder is 10 nm. The volume of the porous particles packed in the breathable bag assembled in the front cavity 12 is 2.5 CC, and the volume of the porous particles assembled in the rear cavity 21 accounts for 0.001 CC of the volume.

[0034] Example 2

[0035] The porous material parts 3 in the front cavity 12 and the rear cavity 21 are porous particles and porous powder respectively, which are filled into the breathable bags and then filled into the front cavity 12 and the rear cavity 21. The materials of the porous particles and the porous powder are activated carbon. The average diameter of the porous particles is 50μm, and the average diameter of the porous powder is 10nm. The volume of the porous particles packed in the breathable bag assembled in the front cavity 12 is 2.5CC, and the volume of the porous particles assembled in the rear cavity 21 accounts for 0.001CC of the volume.

[0036] Example 3

[0037] The porous material parts 3 in the front cavity 12 and the rear cavity 21 are both sheet structures and are respectively bonded and fixed on the inner walls of the front cavity 12 and the rear cavity 21. The material of the sheet structure contains zeolite. The thickness of the sheet structure assembled in the front cavity 12 is 1mm, and the volume is 6CC. The thickness of the sheet structure assembled in the rear cavity 21 is 1μm, and the volume is 0.001CC.

[0038] Example 4

[0039] The porous material parts 3 in the front cavity 12 and the rear cavity 21 are both film layer structures and are respectively bonded and fixed on the inner walls of the front cavity 12 and the rear cavity 21. The material of the film layer structure is zeolite. The thickness of the film layer structure assembled in the front cavity 12 is 10μm and is stacked in 3 layers. The thickness of the film layer structure assembled in the rear cavity 21 is 500nm and is stacked in 2 layers.

[0040] Blank Comparative Example 1

[0041] No porous material part 3 is provided in the front cavity and the rear cavity.

[0042] Blank Comparative Example 2

[0043] No porous material part 3 is provided in the front cavity, and only the porous material part 3 is provided in the rear cavity. The parameters of the porous material part 3 are the same as those in Example 1.

[0044] Test the signal-to-noise ratio and sensitivity of the microphones corresponding to the two blank comparative examples and the foregoing Examples 1-4. The test results are shown in Table 1 below:

[0045] Table 1

[0046]

[0047] As can be seen from the test results in the above table, by arranging the porous material member 3 in the front cavity 12 and the rear cavity 21 of the microphone, the sensitivity and signal-to-noise ratio of the microphone can be effectively improved. Among them, when the porous material member 3 adopts a sheet structure, the corresponding signal-to-noise ratio and sensitivity are the best; when it adopts porous particles / porous powder, the corresponding signal-to-noise ratio and sensitivity are the second; when it adopts a film structure, the corresponding signal-to-noise ratio and sensitivity are the third. When the material of the porous material member 3 is zeolite, the corresponding signal-to-noise ratio and sensitivity are better than when it is activated carbon.

[0048] In some embodiments, the microphone is a moving coil microphone. Further, for the convenience of processing and installing the encapsulation housing 1, referring to Figure 1 and Figure 2 , the encapsulation housing 1 includes a sound-transmitting cover plate 13, a fixing cylinder 14 with openings at both ends, and a base 15. The two ends of the fixing cylinder 14 are respectively connected to the sound-transmitting cover plate 13 and the base 15. The sound-transmitting cover plate 13, the fixing cylinder 14, and the base 15 enclose an inner cavity. The sound hole 11 is opened on the sound-transmitting cover plate 13. The space enclosed by the microphone unit 2, the fixing cylinder 14, and the sound-transmitting cover plate 13 forms the front cavity 12. For the porous material member 3 in the front cavity 12, it can be filled in the entire front cavity 12, or injected, sprayed, or adhered to the inner wall of the sound-transmitting cover plate 13 and / or the inner wall of the fixing cylinder 14.

[0049] For the convenience of installing the microphone unit 2, a plurality of clamping grooves 141 are circumferentially provided on the inner wall of the fixing cylinder 14, and a plurality of clamping blocks 22 are circumferentially provided on the outer wall of the microphone unit 2. Each clamping block 22 can be clamped in the corresponding clamping groove 141.

[0050] Generally, the above-mentioned sound-transmitting cover plate 13 is a circular plate body, the fixing cylinder 14 is a circular cylinder, and the base 15 can adopt the cylindrical structure with one end open shown in Figure 2 . The end of the fixing cylinder 14 is connected to the bottom surface of the cylindrical structure. The microphone unit 2 is also generally a cylindrical structure, and there can be an installation gap 23 between it and the base 15 after it is installed in the inner cavity.

[0051] Referring to Figure 2 , the sound-transmitting cover plate 13 can include an outer ring 131 and a cross-shaped rod 132 connected inside the outer ring 131. Four fan-shaped holes are formed between the cross-shaped rod 132 and the outer ring 131, and the fan-shaped holes form the sound holes 11.

[0052] Of course, the structure and shape of the encapsulation housing 1, the connection manner between the microphone unit 2 and the encapsulation housing 1, and the structural form of the sound-transmitting cover plate 13 can also adopt other methods. This embodiment is only for illustrative purposes.

[0053] During specific processing, first select a porous material piece 3 with suitable acoustic properties and fill it into the front cavity 12 and the rear cavity 21 of the microphone. The filling process can be carried out by injection, spraying, etc., to ensure that the material is evenly distributed and closely adheres to the cavity wall. After the filling is completed, assemble and debug the microphone to ensure its normal operation. During actual use, users can feel that the sound quality is significantly improved and the noise level is significantly reduced, thus obtaining a better user experience.

[0054] In some embodiments, the above-mentioned inner cavity is a closed cavity.

[0055] In some embodiments, the above-mentioned inner cavity is not completely closed. According to actual design requirements, the encapsulation housing 1 can be provided with air vents of different sizes and shapes for different technological purposes, such as filling of porous materials, sound leakage of the module, etc. It can be understood that the improvements made to the encapsulation housing 1 according to actual design requirements are also within the protection scope of the present utility model.

[0056] The above are only schematic specific implementation manners of the present utility model and are not intended to limit the scope of the present utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A microphone, characterized in that, It includes a packaged housing having an inner cavity, and sound holes are provided on the packaged housing for sound to flow into the inner cavity; a microphone element is installed in the inner cavity, and a front cavity close to the sound hole side is formed between the microphone element and the packaged housing, and a rear cavity is formed inside the microphone element; porous material members are provided in both the front cavity and the rear cavity.

2. The microphone according to claim 1, wherein the porous material member is a coating structure and is injected or sprayed on the inner walls of the front cavity and the rear cavity.

3. The microphone according to claim 1, wherein the porous material member is a sheet structure, a block structure or a film layer structure, and is adhesively fixed on the inner walls of the front cavity and the rear cavity.

4. The microphone according to claim 1, wherein the porous material member includes porous particles, and the porous particles are installed in a breathable bag and filled in the front cavity and the rear cavity.

5. The microphone according to claim 1, wherein the porous material member includes porous powder, and the porous powder is installed in a breathable bag and filled in the front cavity and the rear cavity.

6. The microphone according to claim 1, wherein the microphone is a moving coil microphone.

7. The microphone according to claim 1, wherein The density of the porous material piece is 0.3 - 0.5 g / cm 3 , and the porosity is 60 - 90%.

8. The microphone according to claim 1, wherein the packaged housing includes a sound-permeable cover plate, a fixed cylinder with both ends open, and a base. The two ends of the fixed cylinder are respectively connected to the sound-permeable cover plate and the base. The sound-permeable cover plate, the fixed cylinder and the base enclose to form the inner cavity. The sound holes are provided on the sound-permeable cover plate, and the front cavity is formed by enclosing between the microphone element, the fixed cylinder and the sound-permeable cover plate.

9. The microphone according to claim 8, wherein a plurality of card slots are provided circumferentially on the inner wall of the fixed cylinder, and a plurality of card blocks are provided circumferentially on the outer wall of the microphone element, and each card block can be clamped in the corresponding card slot.

10. The microphone according to claim 8, wherein the sound-permeable cover plate includes an outer ring and a cross-shaped rod connected inside the outer ring. Four fan-shaped holes are formed between the cross-shaped rod and the outer ring, and the fan-shaped holes constitute the sound holes.

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