Passive noise reduction structure of earplug

Abstract

The utility model relates to the technical field of earphones, and specifically discloses an earplug passive noise reduction structure. The loudspeaker comprises a shell, an environment sound through hole and a sound outlet nozzle through hole which are communicated with the interior of the shell are formed in the shell, a sound insulation plate is arranged in an inner cavity of the shell, the environment sound through hole and the sound outlet nozzle through hole are separated through the sound insulation plate, a notch is formed in the sound insulation plate to enable the cavity to be communicated to form a sound guide channel, and sound absorption cotton is arranged in the sound guide channel. Compared with an existing means of realizing passive noise reduction by designing a sealing structure, the sound insulation plate is combined with the sound absorption cotton, so that external sound entering from the environment sound through hole is blocked by the sound insulation plate and cannot be directly transmitted to the sound outlet nozzle through hole; and meanwhile, the filled sound-absorbing cotton can absorb some high-frequency noise and environmental noise when passing through the sound guide channel, so that the passive noise reduction value is optimized and adjusted, and the environmental sound sensing function and the passive noise reduction function are better considered.

Description

Technical Field

[0001] The utility model relates to the technical field of earphones, and specifically discloses a passive noise reduction structure for earplugs. Background Art

[0002] The noise reduction means in wireless earphones are generally divided into active noise reduction and passive noise reduction. Among them, passive noise reduction is a technology that reduces external noise through physical sound insulation. The existing passive noise reduction means generally adopt a sealing design for the earphone shell and earplug parts to isolate the entry of external noise to the greatest extent.

[0003] However, since current wireless earphones need to be provided with environmental sound through-holes for transmitting environmental sound, the main purpose of the through-holes is to increase the safety and convenience of users. Through these through-holes, a part of the external environmental sound can enter the ear canal, enabling users to perceive the surrounding sounds, such as traffic signals, alarm sounds or other warning sounds, which is particularly important for pedestrians, athletes or people who need to maintain vigilance. The existing passive noise reduction means that adopt a sealing design are difficult to meet the requirement of perceiving environmental sound. Therefore, a new passive noise reduction structure is needed to improve the passive noise reduction amount while taking into account the sound insulation effect and safety. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a passive noise reduction structure for earplugs.

[0005] The utility model discloses a passive noise reduction structure for earplugs, adopting the following technical solutions:

[0006] A passive noise reduction structure for earplugs, which includes a housing. An environmental sound through-hole and a sound outlet through-hole communicating with the inside of the housing are provided on the housing. A sound insulation board is arranged in the inner cavity of the housing. The environmental sound through-hole and the sound outlet through-hole are separated by the sound insulation board. A notch is provided on the sound insulation board to connect the cavities to form a sound guiding channel, and a sound-absorbing cotton is arranged in the sound guiding channel.

[0007] Preferably, the sound insulation board includes a first sound insulation board and a second sound insulation board arranged at intervals. The notch of the first sound insulation board and the notch of the second sound insulation board are arranged in a staggered manner. The environmental sound through-hole is located on the side of the first sound insulation board facing away from the second sound insulation board, and the sound outlet through-hole is located on the side of the second sound insulation board facing away from the first sound insulation board.

[0008] Preferably, the first sound insulation board and the second sound insulation board are bent in the same direction.

[0009] Preferably, the sound-absorbing cotton is in a W shape.

[0010] Preferably, the axial direction of the environmental sound through-hole forms an angle of 14° with the bottom wall of the sound guiding channel.

[0011] Preferably, the housing includes an ear shell and an ear shell cover that are snap-fitted to each other. The ambient sound through-hole is provided on the side wall of the ear shell, and the sound outlet nozzle through-hole is provided on the bottom wall of the ear shell cover.

[0012] Preferably, a first mesh cloth is provided on the side of the ambient sound through-hole facing the inside of the shell.

[0013] Preferably, a second mesh cloth is provided on the side of the sound outlet nozzle through-hole facing the inside of the shell.

[0014] Preferably, a first mounting groove is provided at the position of the ambient sound through-hole on the side wall of the ear shell, and the first mesh cloth is arranged in the first mounting groove.

[0015] Preferably, a second mounting groove is provided at the position of the sound outlet nozzle through-hole on the bottom wall of the ear shell cover, and the second mesh cloth is arranged in the second mounting groove.

[0016] Compared with the prior art, the present utility model at least includes the following beneficial effects:

[0017] Compared with the existing means of achieving passive noise reduction by designing a sealing structure, the present utility model combines a sound insulation board and a sound absorption cotton. The external sound entering through the ambient sound through-hole is blocked by the sound insulation board and will not be directly transmitted to the sound outlet nozzle through-hole. At the same time, the filled sound absorption cotton can absorb some high-frequency noises and ambient noises when passing through the sound guiding channel, thereby optimizing and adjusting the passive noise reduction value and better balancing the function of perceiving ambient sound and the passive noise reduction function. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the earplug passive noise reduction structure of this embodiment;

[0019] Figure 2 It is a schematic diagram of the structural disassembly of the earplug passive noise reduction structure of this embodiment;

[0020] Figure 3 It is a schematic diagram of the ear shell structure of the earplug passive noise reduction structure of this embodiment;

[0021] Figure 4 It is a cross-sectional view of the earplug passive noise reduction structure of this embodiment;

[0022] Figure 5 It is a cross-sectional view of the earplug passive noise reduction structure of this embodiment in another direction;

[0023] Figure 6 It is a perspective view of the earplug passive noise reduction structure of this embodiment.

[0024] Explanation of the reference numerals in the drawings:

[0025] 1. Auricle; 11. Environmental sound through-hole; 12. First installation groove; 2. Sound insulation board; 21. First sound insulation board; 22. Second sound insulation board; 3. Sound absorption cotton; 4. Auricle cover; 41. Sound outlet nozzle through-hole; 42. Second installation groove; 5. First mesh cloth; 6. Second mesh cloth. Detailed implementation mode

[0026] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation modes.

[0027] This embodiment discloses a passive noise reduction structure for earplugs. Refer to Figure 1-6 , which includes a housing. The housing is provided with an environmental sound through-hole 11 communicating with the inside of the housing and a sound outlet nozzle through-hole 41. A sound insulation board 2 is provided in the inner cavity of the housing. The environmental sound through-hole 11 and the sound outlet nozzle through-hole 41 are separated by the sound insulation board 2. The sound insulation board 2 is provided with a notch to communicate the cavities to form a sound guiding channel, and a sound absorption cotton 3 is provided in the sound guiding channel. Compared with the existing means of realizing passive noise reduction by designing a sealing structure, in this application, by combining the sound insulation board 2 and the sound absorption cotton 3, even in a structure provided with an environmental sound through-hole 11 for sensing external sounds, it also has a good passive noise reduction effect. The external sounds entering from the environmental sound through-hole 11 are blocked by the sound insulation board 2 and will not be directly transmitted to the sound outlet nozzle through-hole 41. At the same time, the filled sound absorption cotton 3 can enable some high-frequency noises and environmental noises to be absorbed when passing through the sound guiding channel, thereby optimizing and adjusting the passive noise reduction value and better balancing the sound insulation effect and safety.

[0028] In this embodiment, the housing includes an auricle 1 and an auricle cover 4 that are buckled with each other. The environmental sound through-hole 11 is provided on the side wall of the auricle 1, and the sound outlet nozzle through-hole 41 is provided on the bottom wall of the auricle cover 4. By adopting the above design, the environmental sound through-hole 11 and the sound outlet nozzle through-hole 41 are arranged on non-parallel planes, thereby further making the noise transmission path more complex, which is beneficial to optimizing and adjusting the passive noise reduction value. As a preferred solution, see Figure 5 , the axial direction of the environmental sound through-hole 11 is designed to form a 14° angle with the bottom wall of the sound guiding channel. The appropriate inclination angle of the environmental sound through-hole 11 is more conducive to better reflection of environmental noise after entering the environmental sound through-hole 11 while ensuring the function of sensing environmental sounds.

[0029] In this embodiment, the sound insulation board 2 is disposed inside the ear shell 1. The sound insulation board 2 includes a first sound insulation board 21 and a second sound insulation board 22 which are spaced apart. The notch of the first sound insulation board 21 is arranged in a staggered manner with the notch of the second sound insulation board 22. The environmental sound through hole 11 is located on the side of the first sound insulation board 21 facing away from the second sound insulation board 22, and the sound outlet nozzle through hole 41 is located on the side of the second sound insulation board 22 facing away from the first sound insulation board 21. By adopting the above design, on the one hand, there are multiple layers of the sound insulation board 2 blocking between the environmental sound through hole 11 and the sound outlet nozzle through hole 41. The noise conducted from the environmental sound through hole 11 is first blocked by the first sound insulation board 21, and then the noise conducted from the notch of the first sound insulation board 21 is blocked by the second sound insulation board 22 again, reducing the amount of external noise transmitted. On the other hand, the sound guiding path formed by the first sound insulation board 21 and the second sound insulation board 22 is longer, which is beneficial for the noise to be better absorbed by the sound absorbing cotton 3, thereby improving the passive noise reduction effect.

[0030] In this embodiment, the partition board 2 is bent, wherein, see Figure 6 , the first sound insulation board 21 is in a C shape, the second sound insulation board 22 is in a V shape, and the first sound insulation board 21 and the second sound insulation board 22 are bent in the same direction. By adopting the above design, a longer sound guiding channel is formed in the limited inner cavity of the shell. The sound absorbing cotton structure matching the shape of the sound guiding channel is approximately in a "W" shape, making the transmission path of the noise more rugged and the passive noise reduction effect better.

[0031] In this embodiment, a first mesh cloth 5 is provided on the side of the environmental sound through hole 11 facing the inside of the shell, and a second mesh cloth 6 is provided on the side of the sound outlet nozzle through hole 41 facing the inside of the shell. By providing the first mesh cloth 5 and the second mesh cloth 6, not only the passive noise reduction effect is further improved, but also a certain dust-proof and anti-fouling function is achieved, better maintaining the sound absorbing performance and service life of the sound absorbing cotton 3.

[0032] In this embodiment, see Figure 2-3 , a first installation groove 12 is provided at the position of the environmental sound through hole 11 on the side wall of the ear shell 1, the first mesh cloth 5 is placed in the first installation groove 12, a second installation groove 42 is provided at the position of the sound outlet nozzle through hole 41 on the bottom wall of the ear shell cover 4, and the second mesh cloth 6 is placed in the second installation groove 42. By providing the first installation groove 12 and the second installation groove 42, it is not only beneficial for the positioning installation and installation stability of the first mesh cloth 5 and the second mesh cloth 6, but also enables the first mesh cloth 5 and the second mesh cloth 6 to be flush with the inner wall of the shell after installation, which is beneficial for the sound absorbing cotton 3 to be installed more smoothly in the sound guiding channel.

[0033] The above has introduced in detail the technical solution provided by the present utility model. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. An earplug passive noise reduction structure, comprising a shell, the shell being provided with an ambient sound through hole communicating with the shell and a sound outlet through hole, characterized in that: The inner cavity of the shell is provided with a sound insulation board, the ambient sound through hole and the sound outlet through hole are separated by the sound insulation board, the sound insulation board is provided with a notch to connect the cavity to form a sound guide channel, and the sound guide channel is provided with sound-absorbing cotton.

2. The passive noise reduction structure of an earplug according to claim 1, characterized in that: The sound insulation board includes a first sound insulation board and a second sound insulation board which are spaced apart from each other, the notch of the first sound insulation board and the notch of the second sound insulation board are staggered, the ambient sound through hole is located on a side of the first sound insulation board away from the second sound insulation board, and the sound outlet through hole is located on a side of the second sound insulation board away from the first sound insulation board.

3. The passive noise reduction structure of an earplug according to claim 2, characterized in that: The first sound insulation board and the second sound insulation board are bent in the same direction.

4. The passive noise reduction structure of an earplug according to claim 3, characterized in that: The sound-absorbing cotton is in a W shape.

5. The passive noise reduction structure of an earplug according to claim 1, characterized in that: The axial direction of the ambient sound through hole forms an angle of 14° with the bottom wall of the sound guide channel.

6. The passive noise reduction structure of an earplug according to claim 1, characterized in that: The shell comprises an ear shell and an ear shell cover which are buckled together, the ambient sound through hole is arranged on the side wall of the ear shell, and the sound outlet through hole is arranged on the bottom wall of the ear shell cover.

7. The passive noise reduction structure of an earplug according to claim 6, characterized in that: A first mesh is provided on one side of the ambient sound through hole facing the inside of the shell.

8. The passive noise reduction structure of an earplug according to claim 6, characterized in that: A second mesh is provided on one side of the sound outlet through hole facing the inside of the shell.

9. The passive noise reduction structure of an earplug according to claim 7, characterized in that: A first installation groove is provided at the position of the ambient sound through hole on the side wall of the ear shell, and the first net is arranged in the first installation groove.

10. The passive noise reduction structure of an earplug according to claim 8, characterized in that: A second mounting groove is provided at the position of the sound outlet through hole of the bottom wall of the ear shell cover, and the second net is arranged in the second mounting groove.

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