Riding helmet noise reduction microphone

Abstract

The utility model provides a riding helmet noise reduction microphone which comprises a lower shell, a wind shielding structure is arranged on the bottom face of the lower shell and comprises a first wind shielding structure and two second wind shielding structures, the first wind shielding structure is arranged on the front side of the bottom face of the lower shell, and the two second wind shielding structures are arranged on the left side and the right side of the bottom face of the lower shell respectively. The two second wind shielding structures are respectively connected with the first wind shielding structure, the bottom surface of the lower shell, the inner wall of the first wind shielding structure and the two opposite inner walls of the two second wind shielding structures are matched to form a wind shielding space, and at least one pickup hole is formed in the bottom surface of the lower shell and located in the wind shielding space; and the upper shell is mounted on the top surface of the lower shell. According to the design, most airflow is guided to the periphery, direct impact on the pickup hole is reduced, and therefore the noise reduction capacity of the pickup hole is improved.

Description

Technical Field

[0001] This utility model relates to the field of cycling helmet technology, specifically to a cycling helmet noise-canceling microphone. Background Technology

[0002] A cycling helmet is a type of head protection equipment designed specifically for cyclists. It includes road cycling helmets, mountain bike helmets, and commuter helmets, and is mainly used to reduce the risk of head injury in the event of an accidental impact or fall while cycling.

[0003] Existing cycling helmets generally have microphones to enable human-machine communication. However, during use, the rapid movement of the helmet in the air causes turbulence, generating noise and affecting the microphones. For example, patent document CN220458693U discloses a cycling helmet that features a front dual-MIC assembly located below the front light housing and a rear main control module assembly located below the rear light housing. The front dual-MIC assembly has integrated MIC elastic plates formed in slots on three adjacent sidewalls, with elastic clips integrally formed at the ends of the MIC elastic plates. The front dual-MIC assembly is securely connected to the helmet body via these elastic clips.

[0004] The front dual-MIC assembly described in the aforementioned patent document can be securely connected to the helmet body via an elastic clip, thereby enabling the installation of the front dual-MIC assembly. However, the wind generated during riding will directly blow onto the microphone, causing noise and affecting the microphone's sound pickup capability. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a noise-canceling microphone for cycling helmets, which can effectively reduce the impact of airflow on the sound pickup device.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A noise-canceling microphone for a cycling helmet includes a lower housing with a windproof structure on its bottom surface. The windproof structure includes a first windproof structure and two second windproof structures. The first windproof structure is located on the front side of the bottom surface of the lower housing, and the two second windproof structures are respectively located on the left and right sides of the bottom surface of the lower housing, and are respectively connected to the first windproof structure. The bottom surface of the lower housing, the inner wall of the first windproof structure, and the two opposing inner walls of the two second windproof structures form a windproof space. At least one pickup hole is located on the bottom surface of the lower housing and within the windproof space. An upper housing is mounted on the top surface of the lower housing.

[0008] Furthermore, the two ends of the first windbreak structure are respectively connected to one end of the two second windbreak structures, or one end of the two second windbreak structures is respectively disposed on the inner wall of the first windbreak structure.

[0009] Furthermore, the length of the first windbreak structure is less than or equal to the length of the lower housing.

[0010] Furthermore, the length of the second windbreak structure is less than, equal to, or greater than the width of the lower housing.

[0011] Furthermore, the height of the second windbreak structure gradually decreases from one end to the other.

[0012] Furthermore, the first windshield structure, the second windshield structure, and the lower shell are integrally formed.

[0013] Furthermore, when viewed from below, the first windshield structure appears to be either straight or curved.

[0014] Furthermore, the lower housing is provided with at least one MIC mounting structure and a microphone inside. One end of the MIC mounting structure is open, and the other end of the MIC mounting structure is connected to the bottom surface of the lower housing. The MIC mounting structure is provided with a sound pickup channel inside, and a sound pickup hole is provided on the bottom surface of the lower housing. The sound pickup hole is located in the sound pickup channel. The microphone is disposed in the sound pickup channel.

[0015] Furthermore, the number of MIC mounting structures is three.

[0016] Furthermore, a predetermined distance is spaced between two adjacent MIC mounting structures.

[0017] Furthermore, a recess is provided on the front side of the bottom of the cycling helmet, and the lower shell and the upper shell are respectively installed in the recess.

[0018] Furthermore, the lower housing has an elastic retaining plate on its side wall, and an elastic retaining head at the end of the elastic retaining plate. The lower housing is then clamped to the upper housing via the elastic retaining head.

[0019] Furthermore, the top surface of the lower housing is provided with a protrusion, and the corresponding position on the bottom surface of the upper housing is provided with a groove, the protrusion and the groove being connected.

[0020] Furthermore, it also includes a windproof cotton, which is disposed in the windproof space.

[0021] The beneficial effects of this utility model are as follows:

[0022] This invention employs a first windbreak structure and a second windbreak structure. The first windbreak structure directly blocks the airflow from the front and forces it to disperse to the left and right sides. The second windbreak structures on both sides further restrict the intrusion of lateral airflow, forming a U-shaped airflow guiding structure. This design directs most of the airflow to the periphery, reducing direct impact on the microphone hole. Furthermore, the first windbreak structure at the front, the second windbreak structures on both sides, and the open space at the rear work together to allow the airflow to flow smoothly out from the rear after bypassing the first and second windbreak structures. Because the rear is not enclosed, turbulence or vortices are avoided, stabilizing the local airflow environment and further preventing wind from blowing directly onto the microphone hole, ultimately achieving noise reduction. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the decomposed structure;

[0025] Figure 3 yes Figure 1 A schematic diagram of the planar structure of the lower and middle shells;

[0026] Figure 4 yes Figure 3 A cross-sectional view at point A-A';

[0027] Figure 5 yes Figure 3 A diagram showing the view from below;

[0028] Figure 6 yes Figure 1 A three-dimensional structural diagram of the upper and middle shells;

[0029] Figure 7 This is an installation diagram of this utility model;

[0030] Figure 8 This is a schematic diagram of the planar structure of the lower shell in the second embodiment of this utility model;

[0031] Figure 9 This is a schematic diagram of the planar structure of the lower shell in the third embodiment of this utility model.

[0032] Figure Labels

[0033] 100. Noise-canceling microphone for cycling helmets;

[0034] 1. Lower housing; 11. Windproof structure; 111. First windproof structure; 1111. Concave surface; 1112. Convex surface; 112. Second windproof structure; 12. Windproof space; 13. Microphone pickup hole; 14. Microphone mounting structure; 141. Microphone pickup channel; 142. Ring structure; 1421. Stepped section; 15. Flexible retaining plate; 151. Flexible retaining head; 16. Protrusion;

[0035] 2. Upper shell; 21. Fixing plate; 211. Slot; 22. Groove. Detailed Implementation

[0036] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top surface", "bottom surface", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] The utility model will be further described below with reference to the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the scope of protection of the utility model.

[0040] Please refer to Figures 1-7A noise-canceling microphone 100 for a cycling helmet includes a lower shell 1. A windproof structure 11 is provided on the bottom surface of the lower shell 1. The windproof structure 11 includes a first windproof structure 111 and two second windproof structures 112. The first windproof structure 111 is located on the front side of the bottom surface of the lower shell 1. The two second windproof structures 112 are respectively located on the left and right sides of the bottom surface of the lower shell 1 and are respectively connected to the first windproof structure 111. The bottom surface of the lower shell 1, the inner wall of the first windproof structure 111, and the two opposing inner walls of the two second windproof structures 112 enclose a windproof space 12. At least one pickup hole 13 is provided on the bottom surface of the lower shell 1 and located in the windproof space 12. An upper shell 2 is installed on the top surface of the lower shell 1. A recess (not shown in the figure) is provided on the front side of the lower part of the cycling helmet (not shown in the figure), and the lower shell 1 and the upper shell 2 are respectively installed in the recess.

[0041] When a user exercises while wearing a cycling helmet (not shown in the figure) equipped with a cycling helmet noise-canceling microphone 100, the first windshield structure 111 at the front directly blocks the airflow from the front and forces the airflow to disperse to the left and right sides. The second windshield structures 112 on both sides further restrict the intrusion of lateral airflow, forming a U-shaped airflow guiding structure. This design directs most of the airflow to the periphery, reducing the possibility of direct impact on the pickup hole 13. Furthermore, the first windshield structure 111 at the front, the second windshield structures 112 on the left and right sides, and the open space at the rear cooperate to allow the airflow to flow smoothly out from the rear after bypassing the first windshield structure 111 and the second windshield structure 112. Since the rear is not enclosed, the generation of turbulence or vortices is avoided, further stabilizing the local airflow environment and further preventing wind from blowing directly onto the pickup hole 13.

[0042] In this embodiment, the outer wall of the front side of the lower housing 1 is arc-shaped, and the outer wall of the rear side of the lower housing 1 is also arc-shaped.

[0043] In this embodiment, both ends of the first windshield structure 111 are respectively connected to one end of two second windshield structures 112. At this time, the first windshield structure 111 and the two second windshield structures 112 are arranged in a "C" shape on the bottom surface of the lower housing 1. At the same time, in this embodiment, the lengths of the first windshield structure 111 and the second windshield structure 112 are not further limited, and are specifically described mainly in the following several combinations. In the first combination, the length of the first windshield structure 111 is equal to the length of the bottom surface of the lower housing 1, and the length of the second windshield structure 112 is less than the width of the bottom surface of the lower housing 1. In the second combination, the length of the first windshield structure 111 is equal to the length of the bottom surface of the lower housing 1, and the length of the second windshield structure 112 is equal to the width of the bottom surface of the lower housing 1. In the third combination, the length of the first windshield structure 111 is equal to the length of the bottom surface of the lower housing 1, and the length of the second windshield structure 112 is greater than the width of the bottom surface of the lower housing 1. In the fourth combination, the length of the first windshield structure 111 is less than the length of the bottom surface of the lower housing 1, and the length of the second windshield structure 112 is less than the width of the bottom surface of the lower housing 1. In the fifth combination, the length of the first windshield structure 111 is less than the length of the bottom surface of the lower housing 1, and the length of the second windshield structure 112 is equal to the width of the bottom surface of the lower housing 1. In the fourth combination, the length of the first windshield structure 111 is less than the length of the bottom surface of the lower housing 1, and the length of the second windshield structure 112 is greater than the width of the bottom surface of the lower housing 1.

[0044] Among them, when the length of the first windshield structure 111 is less than the length of the bottom surface of the lower housing 1, both ends of the first windshield structure 111 are respectively spaced a first distance from the left and right side edges of the bottom surface of the lower housing 1, and the width of the second windshield structure 112 is basically the same as the first distance. Therefore, one end of the two second windshield structures 112 can be respectively connected to both ends of the first windshield structure 111 and are respectively arranged on the left and right sides of the bottom surface of the lower housing 1.

[0045] Please refer to Figure 4In this embodiment, the height of the second windshield structure 112 gradually decreases from one end to the other, that is, the height of the second windshield structure 112 near the first windshield structure 111 gradually decreases towards the end away from the first windshield structure 111. This structure enables the pickup hole 13 located in the windproof space 12 to have noise reduction capability because: 1. The second windshield structure 112 forms a wedge-shaped airflow guide surface. When the user is riding while wearing a cycling helmet, the first windshield structure 111 at the front can block the airflow in front, while the second windshield structures 112 on the left and right sides guide the airflow gently to the sides and rear through their own height gradient, preventing the airflow from impacting the pickup hole 13 vertically. 2. The gradually decreasing height design of the second windshield structure 112 can prevent sudden airflow separation, keeping the airflow in a laminar state and preventing the windproof space 12 from becoming a strong vortex area, thereby further reducing the impact on the pickup hole 13. 3. Guiding the airflow gently around the pickup hole 13 avoids local negative pressure attracting external debris or aggravating dryness. Fourth, the tapered design optimizes the overall aerodynamic shape of the windshield structure, reduces air resistance during movement, and improves energy efficiency. Of course, the height from one end of the second windshield structure 112 to the other end can remain constant or gradually increase; this is not limited here.

[0046] Furthermore, the first windbreak structure 111 is located at the front edge of the bottom surface of the lower housing 1, and the two second windbreak structures 112 are located at the left and right edges of the bottom surface of the lower housing 1, respectively. Alternatively, the first windbreak structure 111 can be spaced a certain distance from the front edge of the bottom surface of the lower housing 1, and the two second windbreak structures 112 can be spaced a certain distance from the left and right edges of the bottom surface of the lower housing 1, respectively; this is not limited here. The outer wall of the connection between one end of the first windbreak structure 111 and one end of one of the second windbreak structures 112 has a smooth transition, and the outer wall of the connection between the other end of the first windbreak structure 111 and one end of the other second windbreak structure 112 also has a smooth transition. The advantages of this structure are: firstly, it prevents airflow from separating due to sudden changes in direction, thus avoiding the formation of local vortices and turbulent zones, which would increase noise. Second, the smooth transition allows the airflow to gently change direction along the curved surface, avoiding sudden separation, reducing turbulence intensity, and enabling the airflow to diffuse more stably backward along the slope of the second windbreak structure 112. Third, the smooth transition can eliminate high-speed airflow jet points and avoid sudden increases in local wind speed. Fourth, sharp corners are high-risk points for stress concentration, which can easily lead to material fatigue or cracking in the first windbreak structure 111 and the second windbreak structure 112. The smooth transition can distribute the stress, thereby extending the service life of the first windbreak structure 111 and the second windbreak structure 112.

[0047] Furthermore, there is a plane parallel to the bottom surface of the lower housing 1. The projection of the connection between the first windshield structure 111 and the second windshield structure 112 onto the plane can be an acute angle, a right angle, or an obtuse angle. When the projection of the connection between the first windshield structure 111 and the second windshield structure 112 onto the plane is an acute angle, a narrow "V"-shaped channel is formed at the connection, and the airflow speed at the connection will increase, which is equivalent to quickly pushing the airflow away from the front area of ​​the pickup hole 13, reducing the frontal air pressure impact. However, due to its own structure, when the connection between the first windshield structure 111 and the second windshield structure 112 is an acute angle, the stress tends to become more concentrated. Therefore, both the first windshield structure 111 and the second windshield structure 112 have a certain thickness to avoid cracking caused by long-term operation. When the projection of the connection between the first windbreak structure 111 and the second windbreak structure 112 onto the plane is a right angle, the connection forms an "L"-shaped barrier. When the airflow impacts this connection, it is divided into a vertical flow towards the first windbreak structure 111 and a lateral flow towards the second windbreak structure 112. Even if the efficiency of the flow division is moderate, its stability is high, forming a natural barrier. In addition, the right-angled structure is suitable for standardized processing, its tolerance is easy to control, and the cost is only 60-70% of that of acute / obtuse angle designs. When the projection of the connection between the first windbreak structure 111 and the second windbreak structure 112 onto the plane is an obtuse angle, the connection has a gradually outward expansion tendency. The airflow can smoothly turn towards the direction of the second windbreak structure 112 along the first windbreak structure 111. In high-speed airflow, the obtuse-angled structure can more effectively guide the airflow around the first windbreak structure 111 and the second windbreak structure 112, avoiding interference from the low-pressure area at the rear to the pickup hole 13.

[0048] Furthermore, when viewed from below, the projection of the first windbreak structure 111 onto a plane parallel to the bottom surface of the lower housing 1 is a straight line. In addition, the projection of the second windbreak structure 112 onto the same plane is also a straight line.

[0049] In a preferred embodiment, the first windbreak structure 111 and the lower housing 1 are integrally formed, and the second windbreak structure 112 and the lower housing 1 are also integrally formed. Visually, the windproof space 12 is formed by a predetermined indentation from the center of the bottom surface of the lower housing 1 towards the upper housing 2, and is formed together with the inner surfaces of the front side wall, the left side wall, and the right side wall of the lower housing 1. The advantages of this structure are: 1. The joints of detachable structures are prone to stress concentration points, which may loosen or break after long-term use. The integrally formed structure has no seams, resulting in stronger overall bending and torsional resistance. 2. The lower housing 1 may be affected by airflow or road vibrations during movement. The integrally formed structure avoids the first windbreak structure 111 and the second windbreak structure 112 shifting or making abnormal noises due to loose components, maintaining stable noise reduction for the sound pickup hole 13. 3. The joints of detachable structures are prone to forming tiny gaps, leading to airflow leakage or localized turbulence, which can disrupt the windproof and dry environment of the windproof space 12. The unibody construction completely seals the interface, ensuring airflow follows the pre-designed path. Fourth, unevenness or misalignment at seams can disrupt airflow, while the smooth surface of the unibody structure maintains the integrity of the airflow design, further suppressing noise and wind erosion. Fifth, for cyclists in high-speed, high-humidity, and dusty environments, the unibody structure is less prone to failure due to corrosion or vibration, making it more versatile.

[0050] In this embodiment, at least one MIC mounting structure 14 and a microphone (not shown in the figure) are provided inside the lower housing 1. The MIC mounting structure 14 is cylindrical in shape. One end of the MIC mounting structure 14 is open and the other end is connected to the bottom surface of the lower housing 1. A pickup channel 141 is provided inside the MIC mounting structure 14. The microphone is located in the pickup channel 141. The aforementioned pickup hole 13 is provided on the bottom surface of the lower housing 1. The pickup hole 13 is located in the pickup channel 141. It should be noted that the opening of the pickup channel 141 on the bottom surface of the lower housing 1 is the aforementioned pickup hole 13.

[0051] Furthermore, each pickup channel 141 is provided with the aforementioned microphone (not shown in the figure). Specifically, a ring-shaped structure 142 is also provided in the pickup channel 141. The ring-shaped structure 142 and the inner wall of the pickup channel 141 form a stepped portion 1421, and the microphone can be disposed on the stepped portion 1421. It should be noted that the specific shape of the ring is not further limited. For example, it can be a circular ring, a square ring, a triangular ring, a quadrilateral ring, etc.

[0052] Furthermore, the number of MIC mounting structures 14 can be one, two, three, or more. As a preferred embodiment, this embodiment sets the number of MIC mounting structures 14 to three, and the distance between two adjacent MIC mounting structures 14 is the same, which is equivalent to the distance between two adjacent pickup holes 13 being the same. In this embodiment, the arrangement of the pickup holes 13 is not limited, but the following arrangements will be described. In the first arrangement, the three pickup holes 13 are arranged equidistantly in a straight line along the length of the lower housing 1. In the second arrangement, two pickup holes 13 are arranged laterally along the length of the lower housing 1, and the remaining pickup hole 13 extends longitudinally along the width of the lower housing 1, that is, the three pickup holes 13 are arranged equidistantly in a triangular shape.

[0053] The advantages of equidistantly arranged microphone mounting structures 14 are as follows: 1. Uniform spacing makes calculating signal delay differences more efficient. By adjusting the phase and amplitude of each microphone signal through algorithms, a direction-selective "virtual beam" can be synthesized. The beam focuses on the direction of the target sound source while suppressing noise from other directions. 2. The equidistant structure facilitates the differentiation of target sound from noise through coherence analysis, such as using the cross-correlation function of multi-channel signals to separate effective signals. 3. The equidistant three-microphone system can be combined with algorithms such as independent component analysis to separate mixed sound sources through signal statistical characteristics. 4. The equidistant arrangement makes the phase difference of noise signals between different microphones easier to predict, and can cancel out environmental noise at specific frequencies through anti-phase superposition (similar to the principle of active noise cancellation). 5. The equidistant arrangement avoids frequency response characteristic shifts caused by differences in microphone position (such as high-frequency attenuation in certain directions), ensuring that the noise suppression algorithm is effective in different frequency bands. 6. Compared to single / dual microphones, three microphones significantly improve noise reduction performance; compared to more microphones (such as 6-8), the cost is lower and the algorithm complexity is moderate, making it suitable for consumer-grade devices.

[0054] Correspondingly, in this embodiment, one of the microphones in the pickup channel 141 is a pickup microphone, mainly used to collect human voice, while the microphones in the remaining two pickup channels 141 are noise-canceling microphones, which have background noise collection functions and can automatically identify noise characteristics, such as sound frequency and amplitude, to facilitate the collection of ambient noise. In general, the design of one pickup microphone + two noise-canceling microphones is mainly to balance clear call quality with efficient ambient noise cancellation. This design strikes a balance between technical cost and user experience, becoming the standard configuration for mainstream microphones.

[0055] In this embodiment, a windproof cotton (not shown in the figure) is placed in the windproof space 12. The advantages of placing the windproof cotton are: 1. The porous structure (such as sponge or plush) disperses the concentrated high-speed airflow into low-speed turbulence, reducing the impact on the microphone. At the same time, the damping characteristics of the material itself can absorb airflow energy and reduce vibration transmission. 2. The windproof cotton can act as a filter layer to block dust, sand, rainwater, etc. from entering the microphone, reducing the risk of diaphragm contamination or corrosion. This allows the microphone to be used even when the rider frequently rides in various extreme environments, thus extending the lifespan of the microphone. 3. It can absorb resonance noise of specific frequencies, improving the purity of the recording. Of course, in addition to being placed in the windproof space 12, the windproof cotton can also be placed in each MIC mounting structure 14. Specifically, the windproof cotton is placed in the pickup channel 141, located between the pickup hole 13 and the microphone. The placement of the windproof cotton is not limited here and is determined by the actual working conditions.

[0056] In this embodiment, an elastic retaining plate 15 is provided on the side wall of the lower housing 1, and an elastic retaining head 151 is provided at the end of the elastic retaining plate 15 near the upper housing 2. Correspondingly, a fixing retaining plate 21 is provided on the side wall of the upper housing 2, and a retaining groove 211 is recessed on the inner side of the fixing retaining plate 21. When the elastic retaining head 151 is locked into the retaining groove 211, the lower housing 1 can be installed on the bottom surface of the upper housing 2. The advantages of this detachable structure are: First, when the microphone inside the lower housing 1 is damaged, it is not necessary to replace the entire cycling helmet, thereby reducing maintenance costs. Second, the upper housing 2 and the lower housing 1 can be produced in parallel, thereby shortening the overall manufacturing cycle.

[0057] Furthermore, the number of elastic clamping plates 15 can be one, two, or more. As a preferred embodiment, in this embodiment, the number of elastic clamping plates 15 is four. Specifically, one elastic clamping plate 15 is provided on the left side wall of the lower housing 1, one elastic clamping plate 15 is provided on the right side wall of the lower housing 1, and two elastic clamping plates 15 are spaced apart on the front side wall of the lower housing 1. Correspondingly, the number of fixing clamping plates 21 is also four, and the position of each fixing clamping plate 21 corresponds to the position of a specific elastic clamping plate 15.

[0058] Furthermore, a protrusion 16 is provided on the top surface of the lower housing 1, and correspondingly, a groove 22 is provided on the bottom surface of the upper housing 2, the position of which corresponds to the protrusion 16. When the lower housing 1 and the upper housing 2 are installed, the protrusion 16 is inserted into the groove 22. The advantage of this structure is that the insertion of the protrusion 16 and the groove 22 provides a guiding function, making the installation of the lower housing 1 and the upper housing 2 easier.

[0059] The working principle of this utility model is described below to facilitate a better understanding of it:

[0060] When a user wears a cycling helmet and engages in activities such as cycling while using communication functions (i.e., speaking into a microphone), airflow blows towards the user from the front of the helmet. The first windshield structure 111 at the front directly blocks the airflow and forces it to disperse to the left and right sides. The second windshield structures 112 on both sides further restrict the intrusion of lateral airflow, forming a U-shaped airflow guiding structure. This design directs most of the airflow to the periphery, reducing the possibility of direct impact on the microphone hole 13. Furthermore, the first windshield structure 111 at the front, the second windshield structures 112 on both sides, and the open space at the rear allow the airflow to flow smoothly out from the rear after bypassing the first and second windshield structures 111 and 112. Meanwhile, because the first windbreak structure 111 blocks the airflow in front of the pickup hole 13, and the two second windbreak structures 112 block the airflow on the left and right sides of the pickup hole 13 respectively, while there is no obstruction on the rear side of the pickup hole 13 (equivalent to the windproof space 12 being an open structure on the rear), the pickup hole 13 becomes more sensitive to the target sound source (i.e., the user's voice) from behind, forming a natural unidirectional directionality. Ultimately, this improves the noise reduction capability of the pickup hole 13.

[0061] Please refer to Figure 8 , Figure 8 This is a schematic diagram of the lower shell 1 in the second embodiment of the present invention. The difference between the second embodiment and the first embodiment lies in the improvement of the first windbreak structure 111 and the second windbreak structure 112, specifically:

[0062] In this embodiment, one end of each of the two second windbreak structures 112 is disposed on the inner wall of the first windbreak structure 111. Compared with the first embodiment, the second embodiment actually moves the two second windbreak structures 112 to the middle position of the first windbreak structure 111 by a predetermined distance. Therefore, when the airflow blows from the front, the first windbreak structure 111 can directly block the airflow and disperse the airflow directly to the left and right rather than guide it to the two second windbreak structures 112, thereby reducing the direct impact of the front airflow on the second windbreak structure 112.

[0063] Furthermore, in this embodiment, the lengths of the first windbreak structure 111 and the second windbreak structure 112 are not further limited. Specifically, the following combinations are used: In the first combination, the length of the first windbreak structure 111 is equal to the length of the bottom surface of the lower housing 1, and the length of the second windbreak structure 112 is less than the width of the bottom surface of the lower housing 1. In the second combination, the length of the first windbreak structure 111 is equal to the length of the bottom surface of the lower housing 1, and the length of the second windbreak structure 112 is equal to the width of the bottom surface of the lower housing 1. In the third combination, the length of the first windbreak structure 111 is equal to the length of the bottom surface of the lower housing 1, and the length of the second windbreak structure 112 is greater than the width of the bottom surface of the lower housing 1. In the fourth combination, the length of the first windbreak structure 111 is less than the length of the bottom surface of the lower housing 1, and the length of the second windbreak structure 112 is less than the width of the bottom surface of the lower housing 1. In the fifth configuration, the length of the first windbreak structure 111 is less than the length of the bottom surface of the lower housing 1, and the length of the second windbreak structure 112 is equal to the width of the bottom surface of the lower housing 1. In the sixth configuration, the length of the first windbreak structure 111 is less than the length of the bottom surface of the lower housing 1, and the length of the second windbreak structure 112 is greater than the width of the bottom surface of the lower housing 1. In the seventh configuration, the length of the first windbreak structure 111 is greater than the length of the bottom surface of the lower housing 1, and the length of the second windbreak structure 112 is less than the width of the bottom surface of the lower housing 1. In the eighth configuration, the length of the first windbreak structure 111 is greater than the length of the bottom surface of the lower housing 1, and the length of the second windbreak structure 112 is equal to the width of the bottom surface of the lower housing 1. In the ninth configuration, the length of the first windbreak structure 111 is greater than the length of the bottom surface of the lower housing 1, and the length of the second windbreak structure 112 is greater than the width of the bottom surface of the lower housing 1.

[0064] Furthermore, the height of the second windshield structure 112 gradually decreases from one end to the other, meaning the height of the end of the second windshield structure 112 closest to the first windshield structure 111 gradually decreases from the end furthest from the first windshield structure 111. This structure enables noise reduction for the microphone 13 located in the windproof space 12 because: 1. The second windshield structure 112 forms a wedge-shaped airflow guide surface. When the user wears a cycling helmet, the first windshield structure 111 at the front blocks the airflow from the front, while the second windshield structures 112 on the left and right sides guide the airflow gently to the sides and rear through their height gradient, preventing the airflow from impacting the microphone 13 vertically. 2. The gradually decreasing height design of the second windshield structure 112 prevents sudden airflow separation, keeping the airflow in a laminar state and preventing the windproof space 12 from becoming a strong vortex area, further reducing the impact on the microphone 13. Third, the airflow is guided to smoothly bypass the sound pickup hole 13, avoiding localized negative pressure that attracts external debris or exacerbates dryness. Fourth, the tapered design optimizes the overall aerodynamic shape of the windshield structure, reducing air resistance during movement and improving energy efficiency. Of course, the height from one end of the second windshield structure 112 to the other end can remain constant or gradually increase; this is not limited here.

[0065] In this embodiment, the first windbreak structure 111 is spaced at a predetermined distance from the front edge of the bottom surface of the lower housing 1, and the two second windbreak structures 112 are spaced at predetermined distances from the left and right edges of the corresponding bottom surfaces of the lower housing 1, respectively. Of course, the first windbreak structure 111 can also be located at the front edge of the bottom surface of the lower housing 1, and the two second windbreak structures 112 can also be located at the left and right edges of the bottom surface of the lower housing 1, respectively; this is not limited here.

[0066] Other technical features and effects are the same as in the first embodiment; please refer to the foregoing description for details. Figures 1-7 The explanation will not be elaborated here.

[0067] Please refer to Figure 9 , Figure 9 This is a schematic diagram of the lower shell 1 in the third embodiment of this utility model. The difference between the third embodiment and the first embodiment lies in the improvement of the first windbreak structure 111, specifically:

[0068] In this embodiment, when viewed from below, the shape of the first windbreak structure 111 changes from a straight line to a curved shape. Specifically, the outer wall of the first windbreak structure 111 has multiple concave surfaces 1111 and convex surfaces 1112 (equivalent to a wavy line). The advantages of this structure are: First, the wavy structure of the concave surfaces 1111 and convex surfaces 1112 can divide the airflow blowing towards the first windbreak structure 111 from the front, transforming it from a flat laminar flow into multiple localized turbulent flows. This turbulence consumes airflow kinetic energy, reducing its overall velocity and impact force, thereby reducing the airflow intensity that directly impacts the pickup hole 13. Compared to a straight first windbreak structure 111, the wavy structure can more effectively disperse concentrated airflow. Second, the wavy structure of the concave surfaces 1111 and convex surfaces 1112 can guide the airflow blowing towards the first windbreak structure 111 from the front, causing it to flow in a tortuous manner along the outer wall of the first windbreak structure 111. This change in path increases the contact time and friction between the airflow and the first windbreak structure 111, thereby further reducing the airflow velocity. III. The wave-like structure of the concave surface 1111 and the convex surface 1112 can increase the possibility of forming local high-pressure and low-pressure zones, thereby interfering with the pressure field of the airflow. Specifically, the high-pressure zone can block the direct penetration of the airflow into the pickup hole 13, while the low-pressure zone can absorb some of the airflow, thus reducing the airflow entering the pickup hole. IV. The wave-like structure of the concave surface 1111 and the convex surface 1112 can reduce the noise generated by airflow vibration, thereby improving the sound pickup quality of the pickup hole 13. V. The wave-like structure of the concave surface 1111 and the convex surface 1112 can increase the rigidity of the first windbreak structure 111, reduce vibration transmission, and indirectly reduce the noise generated by structural resonance.

[0069] Similarly, the shape of the second windbreak structure 112 can also be curved, which is not limited here.

[0070] In this embodiment, the first windbreak structure 111 is spaced at a predetermined distance from the front edge of the bottom surface of the lower housing 1, and the two second windbreak structures 112 are spaced at predetermined distances from the left and right edges of the corresponding bottom surfaces of the lower housing 1, respectively. Of course, the first windbreak structure 111 can also be located at the front edge of the bottom surface of the lower housing 1, and the two second windbreak structures 112 can also be located at the left and right edges of the bottom surface of the lower housing 1, respectively; this is not limited here.

[0071] Other technical features and effects are the same as in the first embodiment; please refer to the foregoing description for details. Figures 1-7 The explanation will not be elaborated here.

Claims

1. A cycling helmet noise-cancelling microphone, characterised in that, include: The lower housing has a windproof structure on its bottom surface. The windproof structure includes a first windproof structure and two second windproof structures. The first windproof structure is located on the front side of the bottom surface of the lower housing, and the two second windproof structures are respectively located on the left and right sides of the bottom surface of the lower housing. The two second windproof structures are respectively connected to the first windproof structure. The bottom surface of the lower housing, the inner wall of the first windproof structure, and the two opposing inner walls of the two second windproof structures form a windproof space. At least one microphone hole is located on the bottom surface of the lower housing and is located in the windproof space. An upper housing is mounted on the top surface of the lower housing.

2. The noise-canceling microphone for cycling helmets according to claim 1, characterized in that: The two ends of the first windbreak structure are respectively connected to one end of the two second windbreak structures, or one end of the two second windbreak structures is respectively set on the inner wall of the first windbreak structure.

3. The noise-canceling microphone for cycling helmets according to claim 2, characterized in that: The length of the first windbreak structure is less than or equal to the length of the lower housing.

4. The noise-canceling microphone for cycling helmets according to claim 3, characterized in that: The length of the second windbreak structure is less than, equal to, or greater than the width of the lower housing.

5. The cycling helmet noise-canceling microphone according to any one of claims 1-4, characterized in that: The height of the second windbreak structure gradually decreases from one end to the other.

6. The cycling helmet noise-canceling microphone according to any one of claims 1-4, characterized in that: The first windshield structure, the second windshield structure, and the lower shell are integrally formed.

7. The cycling helmet noise-canceling microphone according to any one of claims 1-4, characterized in that: When viewed from below, the first windbreak structure appears as a straight line or as a curve.

8. The noise-canceling microphone for cycling helmets according to claim 1, characterized in that: The lower housing has at least one MIC mounting structure and a microphone inside. One end of the MIC mounting structure is open, and the other end of the MIC mounting structure is connected to the bottom surface of the lower housing. The MIC mounting structure has a pickup channel inside, and a pickup hole is provided on the bottom surface of the lower housing. The pickup hole is located in the pickup channel. The microphone is located in the pickup channel.

9. The noise-canceling microphone for cycling helmets according to claim 8, characterized in that: The number of MIC mounting structures is three.

10. The noise-canceling microphone for cycling helmets according to claim 9, characterized in that: A predetermined distance is spaced between two adjacent MIC mounting structures.

11. The noise-canceling microphone for cycling helmets according to claim 1, characterized in that: A recess is provided on the front side of the bottom of the cycling helmet, and the lower shell and the upper shell are respectively installed in the recess.

12. The noise-canceling microphone for cycling helmets according to claim 1, characterized in that: The lower housing is provided with an elastic retaining plate on its side wall, and an elastic retaining head is provided at the end of the elastic retaining plate. The lower housing is clamped to the upper housing through the elastic retaining head.

13. The noise-canceling microphone for cycling helmets according to claim 1, characterized in that: The top surface of the lower housing is provided with a protrusion, and the corresponding position on the bottom surface of the upper housing is provided with a groove, the protrusion and the groove being connected.

14. The noise-canceling microphone for cycling helmets according to claim 1, characterized in that: It also includes a windproof cotton, which is disposed in the windproof space.

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