A headphone wind noise elimination structure based on a ladder-shaped inner receiving cavity

Abstract

The utility model discloses a kind of earphone wind noise elimination structures based on stepped inner retraction cavity, the earphone wind noise elimination structure includes first sound inlet net, shell, sound guide cover and the PCBA component integrated with microphone;The shell has stepped inner retraction cavity, the first sound inlet net is located in the top opening of the stepped inner retraction cavity, the bottom of the stepped inner retraction cavity is equipped with sound inlet, the axial section of the stepped inner retraction cavity is trapezoidal configuration, and noise energy dissipation is realized by setting 20-60 ° sound wave incidence angle, and the cavity has linear flow channel to keep the axial coherence of airflow path.The utility model is through the trapezoidal section design (20-60 ° sound wave incidence angle) of stepped inner retraction cavity, realizes the directional dissipation of noise energy, under the premise of guaranteeing wind noise elimination, simultaneously solve the airflow resistance of traditional maze channel, the problem of complex sound path, and significantly improve yield and production efficiency by means of injection molding integrated.

Description

Technical Field

[0001] This utility model relates to the field of headphone technology, and in particular to a headphone wind noise cancellation structure based on a stepped inner cavity. Background Technology

[0002] Headphones are a pair of transducers that receive electrical signals from a media player or receiver and convert them into audible sound waves using speakers placed close to the ears. The microphone is a key component of headphones.

[0003] Existing TWS earbuds generally feature active noise cancellation, primarily implemented through software to reduce wind noise and improve sound quality. Active noise cancellation works by collecting noise through microphones, then using a series of hardware and software algorithms calculated and designed by acoustic engineers. The circuitry generates a sound wave opposite to the noise, which is emitted through a speaker. Ultimately, the noise and the opposite sound wave cancel each other out, achieving noise reduction. However, because the speaker unit of active noise-canceling earbuds emits additional sound waves to cancel out the noise, some sound detail is lost, resulting in a reduction in sound quality. This is especially true for wind noise, which is generated when the wind blows against the earbud microphone during walking, exercise, or running, producing a whooshing or buzzing noise that severely interferes with the user's listening experience.

[0004] Some TWS earbuds use a labyrinthine sound channel to reduce wind noise, such as patent CN112738686A, which uses a multi-bend structure and wind deflectors to forcibly change the sound wave propagation path to achieve noise attenuation. However, this solution has the following drawbacks: 1. Acoustic performance limitations: Multiple airflow deflections increase airflow resistance and reduce microphone pickup sensitivity; 2. Manufacturing bottlenecks: The complex structure and the curved parts involve surface processing, which limits the yield rate.

[0005] It is evident that there is an urgent need to develop new wind noise cancellation structures that take into account acoustic performance, manufacturability, and cost-effectiveness. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a headphone wind noise cancellation structure based on a stepped inner cavity. By using the trapezoidal cross-section design of the stepped inner cavity (20-60° sound wave incident angle), the directional dissipation of noise energy is achieved. While ensuring wind noise cancellation, it simultaneously solves the problems of high airflow resistance and complex sound path of traditional labyrinth-style channels, and significantly improves yield and production efficiency by means of injection molding.

[0007] To address the aforementioned technical problems, this utility model discloses a headphone wind noise cancellation structure based on a stepped inner cavity, comprising a first sound inlet mesh, a shell, a sound guide sleeve, and a PCBA assembly integrating a microphone; the shell has a stepped inner cavity, the first sound inlet mesh is located at the top opening of the stepped inner cavity, and a sound inlet is located at the bottom of the stepped inner cavity; the axial cross-section of the stepped inner cavity is trapezoidal, and noise energy dissipation is achieved by setting a sound wave incident angle of 20-60°, and the cavity has a linear flow channel to maintain the axial continuity of the airflow path; the sound guide sleeve is used to transmit the sound from the sound inlet to the microphone.

[0008] As an optional implementation, the stepped inward cavity includes at least one inward stepped surface, each stepped surface forming a convergence angle of 20-60° with the central axis, and adjacent stepped surfaces are connected by a vertical transition surface to form a stepped sound wave reflecting surface.

[0009] As another optional implementation, the first sound inlet mesh is made of metal stamping with a mesh density of 200-400 meshes, forming an impedance matching structure with the stepped inward cavity entrance of the outer shell.

[0010] As another optional implementation, a second sound inlet mesh is also included, disposed between the sound inlet and the sound guide sleeve; the second sound inlet mesh is a multi-layer composite structure, comprising at least one waterproof and breathable membrane and one acoustic damping layer, and its edges are fixed in the mounting groove of the outer shell by heat fusion.

[0011] As another optional implementation, the PCBA assembly includes a circuit board and a microphone, with the microphone located on the back of the circuit board; the front of the circuit board has a pickup hole, the entrance of the pickup hole is directly opposite the sound guiding channel of the sound guide sleeve, and the exit of the pickup hole is directly opposite the sound inlet of the microphone located at the bottom.

[0012] As another optional implementation, the axis deviation between the pickup hole and the sound guiding channel of the sound guiding sleeve is less than 0.5mm.

[0013] As another optional implementation, the outlet end of the sound guide channel is provided with a tapered flare structure.

[0014] As another alternative implementation, the outer shell is integrally molded using an injection molding process.

[0015] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:

[0016] This utility model embodiment achieves directional dissipation of noise energy by using a trapezoidal cross-section design (20-60° sound wave incident angle) with a stepped inner cavity, while maintaining the linear flow characteristics of the cavity. Compared with the traditional labyrinthine channel, this design significantly reduces airflow resistance, avoids complex sound wave paths, and improves microphone pickup sensitivity while ensuring wind noise cancellation rate. In addition, the cavity structure can be integrally molded by injection molding process, resulting in high yield and reduced production costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a headphone wind noise cancellation structure based on a stepped inner cavity disclosed in an embodiment of the present utility model;

[0019] Figure 2 This is a partial structural schematic diagram of a headphone wind noise cancellation structure based on a stepped inner cavity disclosed in an embodiment of this utility model;

[0020] Figure 3 This is a cross-sectional structural schematic diagram of a headphone wind noise cancellation structure based on a stepped inner cavity disclosed in an embodiment of this utility model. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] See Figures 1-3This utility model discloses a headphone wind noise cancellation structure based on a stepped inner cavity 21, including a first sound inlet mesh 1, a shell 2, a sound guide sleeve 4, and a PCBA assembly integrating a microphone 6; the shell 2 has a stepped inner cavity 21, the first sound inlet mesh 1 is disposed at the top opening 214 of the stepped inner cavity 21, and the bottom of the stepped inner cavity 21 is provided with a sound inlet 213. The axial cross section of the stepped inner cavity 21 is trapezoidal, and noise energy is dissipated by setting a sound wave incident angle of 20-60°, and the cavity 21 has a linear flow channel to maintain the axial continuity of the airflow path; the sound guide sleeve 4 is used to transmit the sound from the sound inlet 213 to the microphone 6.

[0023] This embodiment of the invention utilizes a trapezoidal cross-section design (20-60° sound wave incident angle) in the stepped, inwardly recessed cavity 21 to achieve directional dissipation of noise energy while maintaining the linear flow characteristics of the cavity. Compared to traditional labyrinthine channels, this design significantly reduces airflow resistance, avoids complex sound wave paths, and improves the pickup sensitivity of the microphone 6 while ensuring wind noise cancellation. Furthermore, the cavity structure can be integrally molded using injection molding, resulting in a high yield rate and reduced production costs.

[0024] In an optional embodiment, the stepped inward cavity 21 includes at least one inwardly tapered step surface 211. Each step surface 211 forms a convergence angle of 20-60° with the central axis, and adjacent step surfaces 211 are connected by a vertical transition surface 212 to form a stepped acoustic wave reflecting surface. The step surface 211 forms a convergence angle of 20-60° with the central axis, and together with the vertical transition surface, constitutes a stepped acoustic wave reflecting surface. This design dissipates noise energy through multi-level reflection, preventing wind noise from directly impacting the microphone 6. At the same time, the linear step structure simplifies the manufacturing process and avoids yield problems caused by curved surface processing.

[0025] Optionally, the intersection between the step surface 211 and the vertical transition surface 212 can be rounded.

[0026] In another optional embodiment, the first sound-entering mesh 1 is made of stamped metal (e.g., steel) with a mesh density of 200-400 mesh, forming an impedance matching structure with the inlet of the stepped inner cavity 21 of the outer shell 2. The use of a 200-400 mesh stamped metal mesh, forming an impedance matching structure with the inlet of the stepped inner cavity 21; the high-density mesh not only blocks large dust particles but also optimizes sound wave transmission efficiency, reduces turbulence disturbances caused by high-frequency wind noise, and balances dustproof and acoustic performance.

[0027] In another optional embodiment, a second sound inlet mesh 3 is further included, disposed between the sound inlet 213 and the sound guide sleeve 4; the second sound inlet mesh 3 is a multi-layer composite structure, comprising at least one waterproof and breathable membrane and one acoustic damping layer, the edges of which are fixed in the mounting groove of the outer shell 2 by heat fusion. The composite structure of the waterproof and breathable membrane and the acoustic damping layer is fixed in the mounting groove of the outer shell 2 by heat fusion. On the one hand, the waterproof layer blocks moisture from corroding the microphone 6 element; on the other hand, the damping layer absorbs low- and mid-frequency wind noise energy, complementing the high-frequency noise reduction of the stepped cavity, thereby achieving full-band noise reduction.

[0028] In another optional embodiment, the PCBA assembly includes a circuit board 5 and a microphone 6, with the microphone 6 located on the back of the circuit board 5. The front of the circuit board 5 has a pickup hole 51, the entrance of which faces the sound guide channel 41 of the sound guide sleeve 4, and the exit of which faces the sound inlet at the bottom of the microphone 6. The microphone 6, located on the back of the circuit board 5, precisely connects to the sound guide channel 41 of the sound guide sleeve 4 through the pickup hole 51. This design shortens the sound wave transmission path, avoids the sound path offset of traditional side-mounted microphones 6, and improves the clarity of human voice pickup.

[0029] In another optional embodiment, the axial deviation between the pickup hole 51 and the sound guide channel 41 of the sound guide sleeve 4 is less than 0.5 mm. Limiting the axial deviation between the pickup hole 51 and the sound guide channel 41 to less than 0.5 mm ensures that sound waves are transmitted to the microphone 6 inlet with zero refraction, eliminating sound energy loss caused by assembly tolerances and solving the potential problem of insufficient pickup accuracy.

[0030] In another optional embodiment, the outlet end of the sound guiding channel 41 is provided with a tapered flare structure. The tapered flare structure at the outlet end of the sound guiding channel 41 reduces the sound wave outlet velocity and reduces airflow turbulence noise. At the same time, it expands the sound wave coverage area, forming an acoustically optimized combination of "wide inlet and tight outlet" with the aforementioned precision pickup hole 51.

[0031] In another optional embodiment, the outer shell 2 is integrally molded using an injection molding process. Integrating the outer shell 2 using injection molding avoids the seams between the parts of the separate cavity. This ensures both the sealing performance and acoustic consistency of the cavity structure, while also reducing assembly steps, meeting the needs of mass production.

[0032] The contents disclosed in this utility model embodiment are merely preferred embodiments of this utility model and are only used to illustrate the technical solutions of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A headphone wind noise cancellation structure based on a stepped inward cavity, characterized in that, The device includes a first sound inlet mesh, a housing, a sound guide sleeve, and a PCBA assembly with an integrated microphone. The housing has a stepped inward cavity, with the first sound inlet mesh located at the top opening of the stepped inward cavity. The bottom of the stepped inward cavity has a sound inlet. The axial cross-section of the stepped inward cavity is trapezoidal. Noise energy dissipation is achieved by setting a sound wave incident angle of 20-60°. The cavity also has a linear flow channel to maintain the axial continuity of the airflow path. The sound guide sleeve is used to transmit the sound from the sound inlet to the microphone.

2. The headphone wind noise cancellation structure according to claim 1, characterized in that, The stepped inward cavity includes at least one inward stepped surface, each step surface forming a convergence angle of 20-60° with the central axis, and adjacent step surfaces are connected by a vertical transition surface to form a stepped sound wave reflecting surface.

3. The headphone wind noise cancellation structure according to claim 2, characterized in that, The first sound inlet mesh is made of metal stamping and has a mesh density of 200-400 meshes, forming an impedance matching structure with the stepped inward cavity entrance of the outer shell.

4. The headphone wind noise cancellation structure according to claim 1, characterized in that, It also includes a second sound inlet mesh, which is disposed between the sound inlet and the sound guide sleeve; the second sound inlet mesh is a multi-layer composite structure, comprising at least one waterproof and breathable membrane and one acoustic damping layer, and its edges are fixed in the mounting groove of the outer shell by heat fusion.

5. The headphone wind noise cancellation structure according to claim 1, characterized in that, The PCBA assembly includes a circuit board and a microphone, with the microphone located on the back of the circuit board; the front of the circuit board has a pickup hole, the entrance of which faces the sound guide channel of the sound guide sleeve, and the exit of which faces the sound inlet of the microphone located at the bottom.

6. The headphone wind noise cancellation structure according to claim 5, characterized in that, The deviation between the pickup hole and the sound guide channel of the sound guide sleeve is less than 0.5 mm.

7. The headphone wind noise cancellation structure according to claim 5, characterized in that, The outlet end of the sound guide channel is equipped with a tapered flare structure.

8. The headphone wind noise cancellation structure according to any one of claims 1-7, characterized in that, The outer shell is integrally molded using an injection molding process.

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