Open acoustic device

Abstract

The application discloses an open acoustic device, wherein the open acoustic device comprises a fixing part and a sound production component, the sound production component comprises a first shell, a second shell and an adjusting structure; the first shell is provided with a sound outlet, and a part of the first shell with the sound outlet can extend into a user's concha cavity; the second shell is connected with the first shell, and one end of the second shell away from the first shell is connected with the fixing part; the adjusting structure connects the first shell and the second shell, and the adjusting structure enables the first shell to rotate relative to the second shell, so that the sound outlet is adjusted to be aligned with a user's ear canal opening. The open acoustic device of the technical scheme can adjust the sound outlet to be aligned with the user's ear canal opening, and better sound listening effect is achieved.

Description

Technical Field

[0001] This application relates to the field of acoustic equipment technology, and in particular to an open acoustic device. Background Technology

[0002] Today, open-back acoustic devices play an important role in people's lives. They enable people to listen and interact in learning settings, communicate with each other in meeting and office settings, and listen to music in private or sports settings.

[0003] In real life, because everyone's ears are different, there are certain differences in the shape and size of different users' ears, which leads to different listening effects when different users wear the same open-back acoustic device. Some users may even experience problems such as not being able to hear clearly or excessive noise, resulting in a poor listening effect. Utility Model Content

[0004] This application provides an open acoustic device that can adjust the sound outlet to be aligned with the user's ear canal for better sound quality.

[0005] This application provides an open acoustic device, which includes a fixing part and a sound-emitting component. The sound-emitting component includes a first housing, a second housing, and an adjustment structure. The first housing is provided with a sound outlet, and the portion of the first housing with the sound outlet can extend into the user's concha cavity. The second housing is connected to the first housing, and the end of the second housing away from the first housing is connected to the fixing part. The adjustment structure connects the first housing and the second housing, and the adjustment structure allows the first housing to rotate relative to the second housing, thereby adjusting the sound outlet to be aligned with the user's ear canal opening.

[0006] The adjustment structure of the open-back acoustic device according to the embodiments of this application connects the first housing and the second housing. The adjustment structure allows the first housing to rotate relative to the second housing, thereby adjusting the sound outlet to align with the user's ear canal. The first housing can find the most suitable position and angle with the user's concha by rotation adjustment, making the contact force more uniform, reducing the pressure of wearing for a long time, and reducing the risk of falling off during exercise. The open-back acoustic device can thus adapt to the ears of different users and meet the wearing needs of different users.

[0007] Open-back acoustic devices can precisely align the sound outlet with the user's ear canal opening through structural adjustments. This precise alignment minimizes sound loss and distortion during propagation, allowing sound waves to travel more directly and concentratedly into the depths of the ear canal, resulting in a better listening experience. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of an embodiment of the open acoustic device of this application; Figure 2 for Figure 1 The diagram shows a first exploded structure of an open acoustic device. Figure 3 for Figure 1 The diagram shows a second exploded structure of the open acoustic device. Figure 4 for Figure 2 A cross-sectional view of the first housing is shown in the figure; Figure 5 for Figure 1 A cross-sectional schematic diagram of an open acoustic device is shown in the image. Figure 6 for Figure 5 The enlarged view of point A shown in the image; Figure 7 for Figure 6 The diagram shows a cross-sectional view of the bellows. Figure 8 for Figure 1 The diagram shows the third exploded structure of the open acoustic device. Figure 9 for Figure 8 The diagram shows the assembly structure of the open acoustic device after some of its structure has been removed. Figure 10 for Figure 9 The enlarged view of point B shown in the image.

[0010] Explanation of icon numbers: 100. Open-type acoustic device; 10. Sound-generating component; 11. First housing; 11a. Sound outlet; 11b. Pressure relief hole; 1111. Front cavity; 1112. Rear cavity; 1113. Front shell; 1114. Rear shell; 112. Slide groove; 113. Receiving groove; 12. Second housing; 121. Slider; 122. Opening; 123. Guide groove; 124. First limiting part; 1241. Sleeve; 1242. Top abutment; 13. Adjustment structure; 130 131. Bellows; 132. First end; 133. Rotary joint; 134. Second stop groove; 15. Third housing; 16. Gasket; 17. Seal; 28. Feedback microphone; 29. ​​Fixing part; 20. Ear hook body; 21. Connector; 222. Second limiting part; 2211. Limiting groove; 30. Speaker unit; 40. Circuit board; 50. Wire; 60. Memory metal wire; 70. Battery.

[0011] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0013] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0014] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0016] Acoustic devices include products such as headphones and hearing aids. Among these designs are open-ear (OWS) devices, which include open-ear headphones and open-ear hearing aids. Specifically, open-ear headphones and open-ear hearing aids can be categorized as such. Generally, open-ear headphones do not block the user's ear canal, thus not completely isolating them from external sounds. Wearers can still hear ambient sounds, such as car noises and other people's calls. This characteristic is crucial for outdoor activities (such as running and cycling) or walking on the street, effectively preventing accidents caused by not being able to hear external sounds and enhancing personal safety during use.

[0017] Currently, open-back acoustic devices have become necessities in people's lives, accompanying them almost all the time. They receive electrical signals from media players or receivers and convert them into audible sound waves using speakers placed close to the ears. This allows people to listen to audio alone without disturbing others, and also isolates them from ambient noise. This is very helpful for people who use them in noisy environments such as recording studios, DJing, traveling, and exercising.

[0018] In real life, different users have different ear shapes and sizes, which leads to an unsatisfactory alignment between the sound outlet and the ear canal opening. When there is a large angular deviation between the sound outlet and the ear canal opening, the sound cannot directly enter the ear canal, resulting in problems such as blurry sound quality, insufficient bass, and harsh treble, resulting in a poor listening experience.

[0019] Furthermore, because people frequently switch between different life scenarios, there is a high demand for multi-form open-back acoustic devices that combine open-back, semi-in-ear, and in-ear designs. However, current open-back acoustic devices generally only have one wearing mode; for example, open-back acoustic devices only have an open-back wearing mode. Therefore, they cannot adequately meet users' needs for open-back acoustic devices in different usage environments.

[0020] To resolve the above issues, please refer to [link / reference]. Figures 1 to 3This application proposes an open-back acoustic device 100. In this embodiment, the open-back acoustic device 100 includes a sound-generating component 10 and a fixing part 20. The sound-generating component 10 generates a sound signal, and the fixing part 20 cooperates with the sound-generating component 10 to allow the open-back acoustic device 100 to be worn on the user's ear. In the wearing state, the sound-generating component 10 is located within or partially within the concha, and the fixing part 20 is at least partially located behind the helix or behind the antitragus. The sound-generating component 10 and the fixing part 20 cooperate to clamp and stably wear the open-back acoustic device 100 on the user's ear.

[0021] The sound-generating component 10 includes a first housing 11, a second housing 12, and an adjustment structure 13. The first housing 11 is provided with a sound outlet 11a, which is used to output the sound waves generated by the sound-generating unit inside the open acoustic device 100 to the user's ear canal.

[0022] The first housing 11 is configured such that the portion having the sound outlet 11a can extend into the user's concha cavity. The second housing 12 is connected to the first housing 11, and the end of the second housing 12 away from the first housing 11 is connected to the fixing part 20. The second housing 12 and the fixing part 20 cooperate to fix the open acoustic device 100 to the user's ear. The materials of the first housing 11 and the second housing 12 can be plastic, silicone, etc., and the shapes of the first housing 11 and the second housing 12 can be the same or different, and their volumes can also be the same or different. For example, the first housing 11 can be an approximately cylindrical structure or an approximately spherical structure to better match the shape of the user's concha cavity, while the second housing 12 can be an approximately cylindrical structure, etc. This application does not impose any limitations on this.

[0023] The adjustment structure 13 of this application connects the first housing 11 and the second housing 12. The adjustment structure 13 allows the first housing 11 to rotate relative to the second housing 12, thereby adjusting the sound outlet 11a to align with the user's ear canal opening. During wear, the user can apply force to the first housing 11 according to their own ear structure and wearing comfort. The first housing 11 can rotate within the concha via the adjustment structure 13, moving relative to the second housing 12 to adjust the sound outlet 11a to align with the user's ear canal opening. The first housing 11 can find the most suitable position and angle with the user's concha through rotational adjustment, resulting in more even contact force, reducing pressure during prolonged wear, and lowering the risk of it falling off during exercise.

[0024] Since the size and position of the ear canal openings of different users vary to varying degrees, the first housing 11 can be adaptively fine-tuned by adjusting the multi-degree-of-freedom directional capability of the adjustment structure 13, so that the sound outlet 11a on the first housing 11 can be aligned with the user's ear canal opening. In this way, the open acoustic device 100 can be adapted to the ears of different users and meet the wearing needs of different users.

[0025] As an audio device placed close to the user's ear, the alignment of the sound outlet 11a with the user's ear canal opening directly determines the quality of sound transmission from the open acoustic device 100 to the user's auditory system. The open acoustic device 100 can precisely align the sound outlet 11a with the user's ear canal opening through the adjustment structure 13. This precise alignment can minimize sound loss and distortion during propagation, allowing sound waves to enter the depths of the ear canal more directly and concentratedly, thereby achieving a better listening experience.

[0026] It should be noted that during wear, if the user feels discomfort due to excessive pressure on the ear canal opening caused by the first shell 11, or if the user wants to switch the open acoustic device 100 to a different wearing state to better match the current usage scenario, the adjustment structure 13 can be adjusted in multiple directions. This allows the user to adjust the sound outlet 11a on the first shell 11 to a position with a greater distance from the ear canal opening, so as to avoid discomfort caused by excessive pressure on the ear canal opening caused by the open acoustic device 100. This also allows for a more open wearing experience and meets the user's needs.

[0027] However, when users feel that the distance between the first housing 11 and the ear canal opening is too large, resulting in a large distance between the sound outlet 11a and the ear canal opening, causing the volume to be too low during playback, or when users want to switch the open acoustic device 100 to an in-ear wearing mode to better match the current usage scenario, due to the multi-degree-of-freedom adjustment characteristics of the adjustment structure 13, users can adjust the first housing 11 to a position close to or covering the ear canal opening. The sound outlet 11a can be more accurately aligned with the ear canal opening, reducing the possibility of sound overflowing from the ear canal, and further obtaining an in-ear wearing experience to meet the user's usage needs.

[0028] Therefore, even when multiple people share the open acoustic device 100, the multi-directional adjustment capability of the adjustment structure 13 can ensure that the open acoustic device 100 has good adaptability to different users, avoid unstable wearing or sound quality degradation due to individual differences, and also meet the needs of the open acoustic device 100 to switch between various different wearing requirements, greatly improving the user experience.

[0029] The fixing part 20 of this application is connected to the second housing 12 and is used to cooperate with the sound-generating component 10 for wearing on the user's ear. It is understood that the fixing part 20 and the second housing 12 can be fixedly connected, or they can be movably connected.

[0030] In one embodiment, the second housing 12 is oscillating relative to the fixing part 20, allowing the open-back acoustic device 100 to further adapt to different users' ear shapes and sizes. Specifically, the second housing 12 has a proximal end near the fixing part 20 and a distal end away from the fixing part 20. The oscillation of the second housing 12 relative to the fixing part 20 can be understood as the trajectory formed by the line connecting the proximal and distal ends during oscillation being fan-shaped or trapezoidal. Thus, when a user wears the open-back acoustic device 100, the fixing part 20 can move and adjust according to the contour of the ear, allowing the open-back acoustic device 100 to fit the ear curve more naturally, distributing the pressure during wear and improving wearing comfort. Especially during prolonged wear, it can effectively reduce ear discomfort or pain caused by excessive tightness.

[0031] For users with small ears or unusual ear shapes, the fixing part 20 can be flexibly adjusted in angle and position to better fix the open acoustic device 100 in the ear, without causing the open acoustic device 100 to be unstable or to put pressure on the ear.

[0032] Furthermore, the second housing 12 of this application can swing relative to the fixed part 20. This allows the second housing 12 to drive the first housing 11 to generate a larger movement trajectory with a smaller stroke. Thus, it is relatively easy to switch between open-ear and in-ear wearing states for the open-ear acoustic device 100 of this application. Specifically, when the open-ear acoustic device 100 is worn on the user's ear, the second housing 12 can be rotated to swing relative to the fixed part 20, adjusting the position of the sound-emitting component 10 on the ear. This adjusts the sound outlet 11a to expose, close, or partially close the user's ear canal, allowing the open-ear acoustic device 100 to switch between open-ear and in-ear wearing states, fully meeting the user's needs in diverse scenarios. The in-ear wearing state includes situations where the user's ear canal is closed or partially closed.

[0033] If the second housing 12 is rotated away from the ear canal, the sound-emitting component 10 will be slightly adjusted outwards. At this time, the sound outlet 11a will gradually move away from the ear canal opening and eventually be positioned to expose the user's ear canal opening, and the open-back acoustic device 100 will enter an open-back wearing state. In this state, the sound outlet 11a maintains a certain gap with the ear canal opening, allowing external sounds to smoothly enter the ear canal. While listening to the audio of the open-back acoustic device 100, the user can clearly perceive the sounds of the surrounding environment, which is very suitable for scenarios where it is necessary to pay attention to external dynamics at all times, ensuring both ease of use and enhanced safety.

[0034] If the second housing 12 is rotated and moved closer to the ear canal, the sound-emitting component 10 will move inward, and the sound outlet 11a will gradually approach the user's ear canal opening, eventually sealing it. At this point, the open-back acoustic device 100 switches to in-ear wearing mode. In this state, the first housing 11 fits tightly against the inner wall of the ear canal opening, effectively blocking external noise and creating a relatively closed acoustic environment. Sound waves experience less loss when propagating in a closed space, significantly enhancing the richness of low frequencies and the detail in mid-to-high frequencies, providing users with an immersive listening experience. This is especially suitable for enjoying music, watching movies, or making voice calls in a quiet indoor environment.

[0035] When the second housing 12 rotates to the middle angle, the sound outlet 11a is positioned to semi-close the user's ear canal opening, and the open-back acoustic device 100 enters a semi-in-ear wearing state. At this time, the sound outlet 11a partially overlaps with the ear canal opening, ensuring a certain degree of acoustic sealing without completely blocking external sounds. This state balances the advantages of open-back and in-ear designs, allowing users to perceive necessary ambient sounds and avoid becoming disconnected from their surroundings, while providing clearer and more stable sound quality than open-back designs, making it suitable for most common scenarios such as daily commutes and office work.

[0036] The adjustment mechanism 13 is mainly used to adjust the distance and angle between the sound outlet 11a on the first housing 11 and the user's ear canal opening, so that the sound outlet 11a is aligned facing the user's ear canal opening. Meanwhile, the movable connection between the fixing part 20 and the second housing 12 allows for overall adjustment of the position and orientation of the sound-emitting component 10. The combination of these two mechanisms enables more precise ear canal alignment, further improving sound quality, reducing sound leakage, and enhancing wearing comfort and stability. This allows the open-back acoustic device 100 to achieve optimal performance in different user ears and usage scenarios.

[0037] When wearing the device, the user can first adjust the relative position between the fixing part 20 and the second shell 12 to roughly adjust the position of the sound-emitting component 10 on the ear to make it suitable for wearing. Then, by adjusting the adjustment structure 13, the user can fine-tune the relative position between the sound outlet 11a and the ear canal opening to ensure that the sound outlet 11a is aligned with the user's ear canal opening, thereby obtaining a clear sound quality experience, achieving a better listening effect, and maintaining wearing comfort and stability.

[0038] In some embodiments, please refer to Figures 2 to 4 as well as Figure 8 The open acoustic device 100 also includes a speaker unit 30, a circuit board 40, a battery 70, and a wire 50. The speaker unit 30 is disposed in the first housing 11, and the circuit board 40 is disposed in the second housing 12. The speaker unit 30 and the circuit board 40 are electrically connected by the wire 50. The wire 50 can be passed through the adjustment structure 13, or it can be connected to the first housing 11 and the second housing 12 by means of secondary injection molding or other methods.

[0039] The sound-generating component 10 also includes a feedback microphone 17 and a sensor. The feedback microphone 17 is used for noise reduction and sound quality optimization, and the sensor may include an IR sensor and a capacitive sensor. It should be noted that the first housing 11 has a receiving cavity, in which the speaker unit 30, the feedback microphone 17, and the sensor are all disposed. The speaker unit 30 divides the receiving cavity into a front cavity 1111 and a rear cavity 1112 that are spaced apart from each other. The front cavity 1111 is located on the front side of the speaker unit 30, and the rear cavity 1112 is located on the rear side of the speaker unit 30.

[0040] Specifically, the first housing 11 includes a front housing 1113 and a rear housing 1114 connected to each other. The front housing 1113 and the rear housing 1114 can be integrally injection molded, or the front housing 1113 and the rear housing 1114 can be set separately and fixedly connected by welding, gluing or other methods. Of course, they can also be detachable connection methods such as snap-fit ​​or interference fit.

[0041] The inner wall of the front housing 1113 and the front side wall of the speaker unit 30 together define the front cavity 1111, the volume of which is within 100mm². 3 ~1000mm 3 The front cavity 1111 is designed to avoid being too small to accommodate other components, while also avoiding being too large to make the open-back acoustic device 100 too bulky. The inner wall of the rear shell 1114 and the rear side wall of the speaker unit 30 together define the rear cavity 1112, the volume of which is within 30mm². 3 ~1000mm 3Between these two points, it is necessary to avoid the rear cavity 1112 being too small to accommodate other components, while also avoiding the rear cavity 1112 being too large to make the overall open acoustic device 100 too large.

[0042] Furthermore, a sound outlet 11a is located on the front shell 1113 and connects to the front cavity 1111. A feedback microphone 17 is located inside the front cavity 1111 and positioned close to the sound outlet 11a. A pressure relief hole 11b is also provided on the rear shell 1114. This hole allows a small amount of air to flow inside and outside the ear canal, thereby balancing air pressure and reducing ear pressure sensation during wear, improving comfort, especially during prolonged use, and preventing ear discomfort or pain caused by excessive ear pressure. The area of ​​the pressure relief hole 11b is approximately 5mm. 2 ~50mm 2 Between these two points, it is necessary to avoid the pressure relief hole 11b being too small, which would make it difficult to balance the air pressure, and at the same time, to avoid the pressure relief hole 11b being too large, which would allow too much air to flow into the ear canal and make it impossible to maintain an appropriate air pressure difference.

[0043] The battery 70 provides power to the speaker unit 30 and the circuit board 40. The specific form of the battery 70 is not limited; for example, a rechargeable lithium battery 70 can be used, making the open-back acoustic device 100 easy to use and carry. The battery 70 can be housed together with the circuit board 40 in the second housing 12, which facilitates heat dissipation design and circuit management, ensuring the stability and safety of the open-back acoustic device 100 during long-term use. Alternatively, it can be housed together with the speaker unit 30 in the first housing 11.

[0044] The open-back acoustic device 100 also includes a third housing 14. The second housing 12 and the third housing 14 are respectively connected to opposite ends of the fixing part 20. The third housing 14, together with the first housing 11 located on the front side of the ear, clamps and fixes the open-back acoustic device 100 to the user's ear. At this time, the battery 70 is disposed in the third housing 14, which makes the center of gravity of the open-back acoustic device 100 closer to the back of the ear, improving the balance and comfort of wearing, reducing pressure on the ear canal, and at the same time, it can more effectively utilize the space behind the auricle, optimize the layout of internal components, increase the potential capacity of the battery 70, and extend the battery life.

[0045] Furthermore, the third housing 14 and the first housing 11 are both located on the same side of the second housing 12 near the user's ear. This same-side layout provides a structural basis for the precise alignment of the sound outlet 11a with the ear canal opening. Since the first housing 11 and the third housing 14 are both located on the same side of the second housing 12 near the user's ear, their positional linkage is stronger.

[0046] When the third housing 14 fits against a specific part of the auricle, the first housing 11 is naturally positioned in the ideal location within the concha cavity through the conduction of the second housing 12, so that the sound outlet 11a is initially aligned with the ear canal opening. At this time, the third housing 14, through the fixing part 20, clamps the second housing 12 on the ear, forming a pre-tightening force. This provides a stable fit for the open-back acoustic device 100 and a reference position for subsequent fine-tuning, reducing alignment deviations caused by the shaking of the open-back acoustic device 100. When the user wears it, the third housing 14 is first inserted and fixed behind the antitragus. The first housing 11 then naturally falls into the appropriate position within the concha cavity under the pre-tightening force, and the sound outlet 11a points towards the ear canal opening. Subsequent minor adjustments are all that is needed to achieve precise alignment, greatly reducing the difficulty of operation and allowing the open-back acoustic device 100 to maintain an ideal wearing condition and listening effect in various usage scenarios.

[0047] In some embodiments, the first housing 11 can move towards and away from the second housing 12 via the adjustment structure 13, and the first housing 11 can also rotate relative to the second housing 12 via the adjustment structure 13, thereby enabling the adjustment structure 13 to rotate within the concha cavity. This application does not limit the manner in which the adjustment structure 13 can rotate; the adjustment structure 13 can possess deformable characteristics due to its material properties, or it can be due to its structural characteristics.

[0048] The adjustment structure 13 allows the first housing 11 to swing relative to the second housing 12 in different directions, thereby adjusting the sound outlet 11a to align with the user's ear canal opening. The adjustment structure 13 has multi-directional compound movement capabilities. When the user wears the open-back acoustic device 100, they can adjust the first housing 11 by slightly rotating it according to the orientation of their ear canal opening. For example, some people's ear canals are slightly tilted upwards, while others are more horizontal. This allows the first housing 11 to swing in different directions, such as up and down, left and right, or diagonally, until the central axis of the sound outlet 11a is completely aligned with the axis of the ear canal opening. This flexible swing adjustment can achieve a high degree of adaptation to individual differences in the ear canal. Even for the same user's left and right ears, due to slight differences in ear canal structure, the sound outlet 11a on both sides can be precisely aligned by adjusting the swing direction of the first housing 11 on each side, ensuring consistency in the listening effect of the left and right ears, thereby achieving a better listening effect.

[0049] The adjusting structure 13 has a first end 131 and a second end 132 disposed opposite to each other along its length. The first end 131 is rotatably connected to the first housing 11, and the second end 132 is fixedly connected to the second housing 12; or, the first end 131 is fixedly connected to the first housing 11, and the second end 132 is rotatably connected to the second housing 12. The fixed connection method includes, but is not limited to, screwing, snap-fitting, welding, and bonding, and may also be a combination of multiple connection methods.

[0050] In one structural form, the adjustment structure 13 includes a universal joint structure, which connects a shaft and a ball joint. The ball joint is connected to one end of the connecting shaft, and the connecting shaft is retractably connected to the second housing 12. This allows adjustment of the distance between the first housing 11 and the second housing 12. The first housing 11 is movably fitted onto the ball joint, allowing the first housing 11 to swing relative to the second housing 12 in different directions, thereby adjusting the sound outlet 11a to align with the user's ear canal opening. The retractable form of the connecting shaft can be a multi-section, nested structure, with the inner section sliding within the outer section. This allows the connecting shaft to be retractably connected to the second housing 12, enabling extension and retraction along the axial direction of the ear canal opening, allowing the sound outlet 11a to move relatively closer to or relatively further away from the user's ear canal opening.

[0051] Furthermore, the first end 131 can be configured as the aforementioned ball head, or both can be configured as ball heads. Thus, the adjustment structure 13 not only allows the first housing 11 to move closer to or further away from the second housing 12 to adjust the distance, but also allows the first housing 11 to rotate relative to the second housing 12, thereby adjusting the sound outlet 11a to align with the user's ear canal opening. This omnidirectional adjustment capability allows the open-back acoustic device 100 to adapt to different users' ear structures and wearing habits. Simultaneously, the portion of the first housing 11 extending into the user's concha can better conform to the concha curve through multi-directional adjustment, distributing force and reducing fatigue caused by prolonged wear.

[0052] Please refer to Figures 2 to 6 In another structural form, the adjustment structure 13 includes a flexible deformation structure. One end of the flexible deformation structure is connected to the first shell 11, and the other end is connected to the second shell 12, allowing the first shell 11 to swing relative to the second shell 12 in different directions. In this case, the flexible deformation structure can be made of deformable materials such as shape memory metal, possessing good elastic deformation capability and shape memory characteristics. When subjected to external force, the flexible deformation structure can undergo bending, torsion, and other deformations, thereby causing the first shell 11 to swing flexibly relative to the second shell 12 to meet different adjustment needs. When the external force is removed, it can maintain its adjusted state through its shape memory function, ensuring the stability of the structure.

[0053] Specifically, the flexible deformable structure is a bellows 130. The structural characteristics of the bellows 130 enable the stretchable movement of the adjustment structure 13. The bellows 130 has a first end 131 and a second end 132 arranged opposite each other along its length. The wire 50 passes through the bellows 130 for easy wiring. The bellows 130 has multiple corrugated folds that can be bent, stretched, and compressed in different directions. When subjected to external force, the bellows 130 can flexibly change its shape, achieving multi-degree-of-freedom deformation. Specifically, the bellows 130 can be adjusted in multiple directions, including vertical, horizontal, and tilt directions, allowing the first shell 11 to move relative to the second shell 12, thus enabling adjustments according to the user's ear shape and wearing habits.

[0054] The following will describe in detail the structural form of the regulating structure 13, including the bellows 130.

[0055] The corrugated pipe 130 can be made of one or a combination of silicone, plastic, nylon, shape memory metal, etc. These materials have good flexibility and elasticity, can adapt to the deformation requirements of multiple degrees of freedom, and at the same time ensure sufficient durability and service life.

[0056] For example, when the bellows 130 is made of silicone, silicone has good flexibility and elasticity, enabling a large deformation range while maintaining good resilience, ensuring that the open-back acoustic device 100 can return to its original shape after multiple adjustments. Silicone has good weather resistance and is not easily aged or deteriorated by environmental factors such as temperature changes and ultraviolet radiation, extending the service life of the bellows 130. In addition, the softness of silicone can absorb some vibration and noise, improving wearing comfort and sound quality.

[0057] For example, when the material of the corrugated tube 130 is plastic, there are many types of plastics, including TPU and TPE, and different plastic materials with different properties can be selected as needed. Plastics can be molded through processes such as injection molding, which facilitates large-scale production and reduces manufacturing costs. By selecting plastics with different hardness and toughness, the mechanical properties of the corrugated tube 130 can be adjusted to meet different wearing needs and usage scenarios.

[0058] The corrugated cross-section of the bellows 130 can be circular or square, and the axial height of each corrugation is 0.1mm to 35mm, while the overall height of the bellows 130 is 1mm to 100mm. If the corrugation height is less than 0.1mm and the height of the bellows 130 is less than 1mm, the deformation of the adjustment structure 13 will be insignificant, making it difficult to distinguish between in-ear and open-ear wearing states, thus hindering the switching effect. If the corrugation height is greater than 35mm and the height of the bellows 130 is greater than 100mm, the structure will be overly complex, increasing the overall size and weight of the open-ear acoustic device 100 and exacerbating user discomfort during wear.

[0059] It should be noted that the bellows 130 can be fixedly connected to one of the first housing 11 and the second housing 12, and rotatably connected to the other of the first housing 11 and the second housing 12. That is, the first end 131 of the bellows 130 is rotatably connected to the first housing 11, and the second end 132 is fixedly connected to the second housing 12; similarly, the first end 131 of the bellows 130 can be fixedly connected to the first housing 11, and the second end 132 is rotatably connected to the second housing 12.

[0060] In one structural configuration, the first end 131 can deform under stress through the bellows 130, moving relatively closer to or further away from the second end 132. This causes the first housing 11 to move relatively closer to or further away from the second housing 12, thereby adjusting the distance between the first housing 11 and the second housing 12. Simultaneously, the bellows 130 can extend and retract in its axial direction, allowing the sound outlet 11a to move relatively closer to or further away from the user's ear canal opening, thus enabling the sound outlet 11a to be aligned with the user's ear canal opening.

[0061] Furthermore, the adjustable nature of the bellows 130 allows the sound outlet 11a to be sufficiently far from the user's ear canal opening, thus exposing the user's ear canal opening, or at least partially far from or completely within the user's ear canal opening, satisfying the wearing needs of the open-back acoustic device 100 when switching between open-back, semi-in-ear, and in-ear wearing modes. The structural design of the bellows 130 allows it to return to its original shape after repeated stretching and deformation, exhibiting high durability and fatigue resistance. Even with frequent use and adjustments by multiple users, the durability of the bellows 130 ensures the stable performance of the open-back acoustic device 100, preventing damage or deformation failure and extending the overall lifespan of the open-back acoustic device 100.

[0062] In another structural form, the first end 131 can be deflected relative to the second end 132 in the axial direction of the bellows 130 by deformation under stress, so that the first housing 11 is deflected relative to the second housing 12 in the axial direction of the bellows 130. Specifically, when the first housing 11 and the second housing 12 are not moving relative to each other, that is, when the bellows 130 is not deformed, then, as Figure 7 As shown, the plane containing the radial direction of the bellows 130 is defined as the initial plane, and the angle between the initial plane and the axis of the bellows 130 is D, which is 90 degrees at this time.

[0063] When the bellows 130 is deformed by an external force, the first housing 11 deflects relative to the second housing 12 in the axial direction of the bellows 130 to change the angle D. This allows the first housing 11 to tilt at a certain angle to better align with the ear canal opening, thereby providing the user with an immersive listening experience. Alternatively, the tilting of the first housing 11 can expose part of the ear canal opening and relieve the wearing pressure of the ear canal opening.

[0064] The included angle D is greater than or equal to 30 degrees and less than or equal to 90 degrees, allowing the first housing 11 to have a multi-angle, multi-degree-of-freedom deflection effect, and further enabling gear adjustment by setting a gear slot. Through the axial deflection of the bellows 130, the sound outlet 11a on the first housing 11 can be better aligned with the ear canal opening, achieving a precise fit, thereby improving sound quality and reducing sound leakage. In dynamic environments, such as during movement or frequent head turning, the deflection adjustment function of the bellows 130 ensures a tight fit between the first housing 11 and the ear canal opening, improving wearing stability and preventing the open-back acoustic device 100 from loosening or falling off.

[0065] In addition, one of the first housing 11 and the second housing 12 is provided with a slider 121, and the other of the first housing 11 and the second housing 12 is provided with a groove 112. The first end 131 can be deformed by the bellows 130 when subjected to force and rotate relative to the second end 132, so that the first housing 11 rotates relative to the second housing 12. The slider 121 is located in the groove 112 and can slide along the groove 112 during rotation.

[0066] Furthermore, the length of the groove 112 is greater than the length of the slider 121, ensuring smooth and accurate rotation. The cooperation between the slider 121 and the groove 112 allows the first housing 11 to rotate relative to the second housing 12 within a certain range, ensuring limit during rotation adjustment and preventing excessive rotation of the open-back acoustic device 100, which could lead to unstable wearing or dislodgement. The cooperation between the slider 121 and the groove 112 also reduces friction between the first housing 11 and the second housing 12 during relative rotation, reducing wear between components and extending the service life of the open-back acoustic device 100.

[0067] Different users have different ear shapes and sizes. The structure of the slider 121 and the groove 112 allows the open-back acoustic device 100 to be finely adjusted during wear to accommodate various ear shapes. For example, for users with flatter ears or special ear canal angles, the first housing 11 can be rotated to better fit the ear, improving wearing comfort and stability.

[0068] The above examples illustrate how the deformation of the bellows 130 allows the first end 131 and the second end 132 to move closer, further apart, deflect, and rotate, thereby enabling the first housing 11 to swing relative to the second housing 12 in different directions. Users can adaptively fine-tune the first housing 11 according to specific needs. The various deformation states and multi-degree-of-freedom adjustment methods of the bellows 130 allow users to freely adjust the distance between the sound hole 11a and the ear canal opening to meet the wearing needs of the open-back acoustic device 100 when switching between open-back and in-ear wearing modes.

[0069] In some embodiments, a receiving groove 113 is provided on one of the first housing 11 and the first end 131, and a rotary joint 1311 is provided on the other of the first housing 11 and the first end 131. The rotary joint 1311 is snapped into the receiving groove 113 and is rotatably disposed in the receiving groove 113. The shape and size of the rotary joint 1311 match the receiving groove 113. Through the cooperation between the rotary joint 1311 and the receiving groove 113, the stability and reliability of the connection of the adjustment structure 13 during the rotational movement relative to the first housing 11 are ensured, and the separation of the two due to external force or vibration during use is prevented.

[0070] Furthermore, the rotary joint 1311 is rotatably disposed within the receiving groove 113, effectively preventing relative displacement between the first housing 11 and the adjustment structure 13, ensuring the stability of the open acoustic device 100 in dynamic environments, and simplifying and speeding up the assembly process of the first housing 11 and the adjustment structure 13, thereby improving production efficiency and reducing assembly costs. It also facilitates quick disassembly when maintenance or component replacement is required, improving the maintainability of the open acoustic device 100. Simultaneously, this rotational limiting design provides multiple preset rotation angles, ensuring the stability of the first housing 11 at each angular position and providing users with a more precise adjustment experience.

[0071] In some embodiments, please refer again Figures 2 to 6The open-back acoustic device 100 also includes a gasket 15. A first stop groove 133 is provided on the outer peripheral wall of the adjustment structure 13 near the second end 132. The gasket 15 is embedded in the first stop groove 133 and abuts against the second housing 12. The gasket 15, through its shape and size, fits tightly with the first stop groove 133, ensuring a stable connection between the adjustment structure 13 and the second housing 12. The material of the gasket 15 typically has a certain degree of elasticity, providing a certain degree of cushioning and shock absorption.

[0072] After the shim 15 is embedded in the first stop groove 133, it can effectively prevent the second end 132 of the adjusting structure 13 from moving axially on the second housing 12, ensuring a stable connection between the adjusting structure 13 and the second housing 12. The elasticity of the shim 15 can reduce the direct friction between the adjusting structure 13 and the second housing 12, reduce wear, extend the service life of the components, and provide a certain buffering and shock absorption effect when the open acoustic device 100 is subjected to external impact, protecting the internal components from damage. During the rotation of the adjusting structure 13, the shim 15 can maintain the connection stability between the adjusting structure 13 and the second housing 12, ensuring the smoothness and accuracy of the adjustment process.

[0073] It should be noted that the rotary joint 1311 and the receiving groove 113 cooperate to connect the first end 131 of the adjusting structure 13 to the first housing 11. At the same time, the gasket 15 is embedded in the first stop groove 133 and abuts against the second housing 12. The gasket 15 is located between the second end 132 of the bellows 130 and the second housing 12. No matter how the adjusting structure 13 moves in different directions, the first end 131 and the second end 132 of the adjusting structure 13 generate a pulling force in opposite directions, so that the first end 131 and the second end 132 are fixed to the first housing 11 and the second housing 12 respectively. The structure is simple and ensures stability during long-term use.

[0074] In some embodiments, the centerline of the sound outlet 11a is set at an angle to the rotation axis of the first housing 11, enabling dual optimization of structural fit and acoustic alignment when the open-back acoustic device 100 is worn. When the external structure of the first housing 11 fits the user's concha, its contour design must follow the natural curvature of the concha to ensure wearing stability and comfort. The presence of the angle allows the sound outlet 11a to pre-point in the approximate direction of the ear canal opening, based on the first housing 11 fitting the concha. This eliminates the need for additional user adjustments, allowing the sound wave propagation path to be closer to the ear canal axis, reducing the initial sound offset sensation. This design ensures a tight fit between the first housing 11 and the concha, preventing shaking or pressure during wear, and compensates for the natural deviation between the concha's orientation and the ear canal opening's direction through the angle difference. This allows the sound outlet 11a to have the basic conditions for alignment with the ear canal opening from the initial state, requiring only minor adjustments to achieve the ideal alignment. This significantly reduces the user's operational threshold and greatly enhances the user experience.

[0075] This design provides more flexible adjustment space for the precise alignment of the sound outlet 11a, enabling it to adapt to different ear canal opening orientations more quickly. This makes the adjustment process more efficient and convenient. Users only need to slightly rotate the first housing 11 to allow the sound outlet 11a to quickly find the optimal angle aligned with the ear canal opening, further improving the convenience and accuracy of adjustment. This also makes the open acoustic device 100 more adaptable to a wider range of ear canal structures.

[0076] In some embodiments, the open acoustic device 100 further includes a seal 16. When the adjustment structure 13 is a bellows 130, a second stop groove 134 is provided on the outer peripheral wall of the bellows 130. The seal 16 is embedded in the second stop groove 134 and is press-fitted with the first housing 11 and the second housing 12, or press-fitted with one of the first housing 11 and the second housing 12. The seal 16 includes, but is not limited to, rubber rings, silicone gaskets, etc. The seal 16 fills the tiny gap between the bellows 130 and the first housing 11 and the second housing 12 through its elastic deformation, effectively preventing external pollutants such as dust and moisture from entering the interior of the open acoustic device 100, improving the protective performance of the open acoustic device 100, and maintaining a long-term stable sealing effect.

[0077] Meanwhile, the seal 16 also has a damping effect, reducing sound leakage from the gap between the bellows 130 and the first housing 11 and the second housing 12, improving sound quality and enhancing the user's listening experience. The interference fit of the seal 16 further enhances the connection stability between the bellows 130 and the first housing 11 and the second housing 12, preventing loosening due to external forces or vibrations during use. During the deformation of the bellows 130, the seal 16 can maintain a tight fit between the bellows 130 and the first housing 11 and the second housing 12, ensuring smooth and precise adjustment.

[0078] In some embodiments, please refer to Figure 2 , Figures 8 to 10 The second housing 12 is provided with an opening 122 and a guide groove 123 communicating with the opening 122. The fixing part 20 includes an ear hook body 21 and a connector 22 connected to each other. The ear hook body 21 passes through the opening 122, and the connector 22 is located in the guide groove 123 and can slide along the guide groove 123. This allows for relative movement between the fixing part 20 and the second housing 12, thereby further adjusting the position of the open acoustic device 100 worn on the user's ear and improving the adaptability and user experience of the open acoustic device 100.

[0079] The ear hook body 21 is a rod-shaped structure, comprising a rod-shaped main body made of plastic, while the connector 22 can be made of the same material as the rod-shaped main body of the ear hook body 21 and is manufactured by integral injection molding. The rod-shaped main body of the ear hook body 21 can be made of thermoplastic polyurethane soft rubber, making it more comfortable for users to wear and preventing ear pain even after prolonged use. The connector 22 can be made of acrylonitrile-butadiene-styrene rigid plastic, which results in high structural strength and smoother rotation. The ear hook body 21 and the connector 22 are integrally formed by secondary injection molding, increasing the connection strength between them. Of course, in other structural forms, the connector 22 and the ear hook body 21 can also be separate structures. In such cases, the connector 22 can be fixed into one piece by bonding, welding, or other connection methods such as threaded connection or snap-fit. This application does not impose any restrictions on this.

[0080] Furthermore, the guide groove 123 extends circumferentially along the second housing 12, and is arc-shaped in its length extension direction. The connector 22 is an arc-shaped structure adapted to the guide groove 123. Specifically, the guide groove 123 extends circumferentially along the end of the second housing 12 near the fixing part 20. When the connector 22 slides relative to the guide groove 123, the second housing 12 swings. A first limiting surface and a second limiting surface are respectively provided at both ends of the guide groove 123. The connector 22 slides between the first and second limiting surfaces. The first and second limiting surfaces provide a clear adjustment range for the sliding of at least part of the ear hook body 21, ensuring that the user does not exceed the effective usage limit when adjusting the open acoustic device 100. In this embodiment, the opening length of the opening 122 is less than the distance between the first and second limiting surfaces, while the length of the connector 22 is greater than the opening length of the opening 122. This design also prevents the connector 22 from sliding out of the guide groove 123.

[0081] It is understandable that the design of making the length of the connector 22 greater than the open length of the opening 122 is only one feasible way to prevent the connector 22 from sliding out of the opening 122. In other structural forms, the connector 22 can be positioned on the first limiting surface and the second limiting surface, and the width of the connector 22 can be greater than the width of the opening 122, or other limiting structures can be added.

[0082] In some embodiments, the open-back acoustic device 100 further includes a first limiting portion 124 and a second limiting portion 221. The first limiting portion 124 is disposed on one of the connector 22 and the second housing 12, and the second limiting portion 221 is disposed on the other of the connector 22 and the second housing 12. The first limiting portion 124 and the second limiting portion 221 elastically abut against each other and are movable relative to each other. The first limiting portion 124 and the second limiting portion 221 can provide a stopping point after the user has adjusted the device, so that the open-back acoustic device 100 can be stably positioned after the user finds the optimal wearing position, without worrying about accidental changes in the position between the second housing 12 and the ear hook body 21. This ensures reliability for long-term wear, and the elastic abutment reduces mechanical wear between the first limiting portion 124 and the connector 22 or the second housing 12, thereby improving the durability and service life of the open-back acoustic device 100.

[0083] The first limiting part 124 is disposed on the second housing 12, and the second limiting part 221 is disposed on the connector 22. Of course, the first limiting part 124 may also be disposed on the connector 22, and the second limiting part 221 may be disposed on the second housing 12. This application does not limit this.

[0084] In one embodiment, the second limiting portion 221 has a wave-like structure, that is, the second limiting portion 221 includes a plurality of recesses and a plurality of protrusions spaced apart. The wave-like structure provides a plurality of sequentially connected recesses, thus allowing the first limiting portion 124 to have multiple fixed positions within a certain range, increasing the continuity of rotation of the first limiting portion 124. When the first limiting portion 124 is stopped at the protrusion position of the wave-like structure, a damping effect is generated, thereby making it less likely for the connecting member 22 to loosen after adjustment.

[0085] Specifically, a first limiting part 124 is disposed on the second housing 12, and a second limiting part 221 is disposed on the connector 22. The second limiting part 221 is provided with at least two limiting grooves 2211 connected in sequence. That is, there can be two, three, or five limiting grooves 2211. During the sliding of the connector 22 along the guide groove 123, the first limiting part 124 can move sequentially within two adjacent limiting grooves 2211. Each limiting groove 2211 serves as a fixed point, ensuring the stability of the connector 22 when adjusted to a specific position and preventing the connector 22 from sliding or shifting during use of the open acoustic device 100. By providing two or more limiting grooves 2211, the ear hook body 21 can be well positioned after adjustment even with a large range of adjustment relative to the second housing 12, thus better adapting to the needs of different users.

[0086] It should be noted that when the second limiting part 221 is provided on the connector 22, the second limiting part 221 can be an additional part on the connector 22, and the limiting groove 2211 and the wave-shaped structure are formed by the part other than the connector 22, or the limiting groove 2211 is formed by the additional part and the connector 22 together. In other embodiments, the second limiting part 221 can also be a concave-convex space structure formed by the connector 22 itself. This application does not limit this.

[0087] In another embodiment, the second limiting part 221 is a damping plate. The damping plate can be made of rubber, silicone, or other elastic materials. The damping plate elastically abuts against the first limiting part 124 and is movable relative to it. The damping plate can be fixed to the connector 22 or to the second housing 12. In this embodiment, when the user does not apply external force to the connector 22, the damping plate provides damping force to maintain the relative position of the connector 22 in the guide groove 123. Therefore, after the user adjusts the connector 22 according to wearing needs, the ear hook body 21 and the second housing 12 maintain their relative position, improving the user experience. The damping plate design allows the connector 22 to remain at various minute adjustment angles, achieving stepless adjustment.

[0088] In one embodiment, the first limiting part 124 can be a ball bearing. The ball bearing has a compact structure and will not significantly increase the volume of the open acoustic device 100, thus helping to maintain the portability and lightness of the open acoustic device 100. The ball bearing includes a sleeve 1241 and a top abutment 1242 movably disposed within the sleeve 1241. The sleeve 1241 is disposed on the groove wall of the guide groove 123, and the top abutment 1242 elastically abuts against the second limiting part 221 and is movable relative to it.

[0089] The abutment 1242 can move sequentially into at least two limiting grooves 2211, thereby enabling the ear hook body 21 to rotate relative to the second housing 12. The sleeve 1241 is disposed on the groove wall of the guide groove 123, providing stable support and ensuring the stability of the open-back acoustic device 100 during wearing and use. The bead can be customized according to the specific design requirements of the limiting groove 2211, providing design flexibility. Exemplarily, the abutment 1242 can be one of a spherical abutment 1242, a cylindrical abutment 1242, and a wedge-shaped abutment 1242. The specific structure of the abutment 1242 for the bead can also be other various structures, and this application does not limit this.

[0090] In another embodiment, the first limiting part 124 can also be a spring sheet. The spring sheet can be made of metal, which has a simple structure, is not easily damaged, and has a relatively low manufacturing cost. The spring sheet includes an integrally formed spring sheet body and a limiting protrusion. The spring sheet body is disposed on the groove wall of the guide groove 123, and the limiting protrusion is connected to the spring sheet body and protrudes from one side of the spring sheet body. The limiting protrusion elastically abuts against the second limiting part 221 and can move relative to it.

[0091] The limiting protrusion can move sequentially into at least two limiting grooves 2211, thereby enabling the ear hook body 21 to rotate relative to the second housing 12. The design of the limiting protrusion and the limiting groove 2211 allows for a certain degree of elastic adjustment. When the limiting protrusion is subjected to external force, it can deform in the opposite direction of the external force; when the external force disappears, the limiting protrusion returns to its original shape and abuts against the limiting groove 2211.

[0092] In some embodiments, the open-back acoustic device 100 further includes a shape memory wire 60. A wire outlet hole is provided on the connector 22. Partial structures of the wire 50 and the shape memory wire 60 are located within the ear hook body 21 and sequentially pass through the wire outlet hole and the adjustment structure 13, simplifying the wiring. When the adjustment structure 13 is a corrugated tube 130, the wire 50 can directly pass through the inside of the corrugated tube 130 for wiring, eliminating the need for additional wiring space and resulting in a simpler wiring layout.

[0093] It should be noted that the memory metal wire 60 is made of an alloy with memory properties, typically composed of materials such as nickel, titanium, platinum, copper, and silver. The memory metal wire 60 possesses high elasticity, wear resistance, and stability, allowing it to maintain its original shape and performance under varying temperature and humidity conditions. This ensures appropriate pressure between the sound-generating component 10 and the fixing part 20 and the ear during wear, making the open-back acoustic device 100 more securely fixed around the ear and less prone to loosening or shifting. Furthermore, the memory metal wire 60's high elasticity and durability allow it to better adapt to different users' ear sizes, meeting diverse usage needs. It can also withstand prolonged stretching and compression without easily deforming or fatigued, extending the lifespan of the open-back acoustic device 100.

[0094] Furthermore, the wire 50 and the memory metal wire 60 are arranged in parallel. It should be noted that parallel arrangement means that the memory metal wire 60 and the wire 50 extend in the same direction and are spaced apart from each other. This arrangement allows the memory metal wire 60 and the flexible circuit board 40 to maintain a distance, avoiding their crossing and entanglement, and making the spatial layout of the open acoustic device 100 more reasonable.

[0095] In addition, the memory metal wire 60 not only makes the ear hook body 21 more elastic, but also provides a certain support for the ear hook body 21. When the open acoustic device 100 is subjected to external force, the memory metal wire 60 can protect the wire 50 to a certain extent and avoid the risk of the wire 50 being pulled or broken.

[0096] The conductor 50 and the memory metal wire 60 are partially housed within the ear hook body 21 and are sequentially threaded through the outlet hole and the corrugated tube 130. The cross-sections of the conductor 50 and the memory metal wire 60 can be circular or circular, and the combined cross-sectional area of ​​the two is not greater than the cross-sectional area of ​​the corrugated tube 130, so as to avoid excessive compression during wiring, which could cause friction damage to the components and ensure smooth wiring while providing sufficient protection.

[0097] Specifically, the diameter of the shape memory wire 60 can range from 0.1 mm to 3 mm, and the equivalent cross-sectional area ranges from 0.007 mm². 2 ~7mm 2 Between these conditions, it is ensured that the shape memory wire 60 is not too thin to be easily broken, and that the shape memory wire 60 is not too thick to be difficult to adapt to deformation.

[0098] Understandably, the open acoustic device 100 of this application can also be an open hearing aid. When a hearing-impaired user wears the open acoustic device 100 in their ear, the open acoustic device 100 can at least provide the hearing-impaired user with amplification of external sounds.

[0099] The open-back acoustic device 100 includes the main structure described above. Unlike open-back headphones, it does not require noise reduction design, i.e., it does not need a feedback microphone 17. It should be noted that in order to facilitate the amplification of external sounds by the open-back acoustic device 100, an amplifier is also provided on the circuit board 40, and the amplifier is connected to the speaker 30.

[0100] Specifically, the amplifier on the circuit board 40 first uses a microphone to acquire external sound (sound waves) and converts it into an extremely weak electrical signal. Then, it amplifies the electrical signal and sends the amplified electrical signal to the speaker 30. The speaker 30 converts the amplified electrical signal into an amplified sound wave signal and transmits it to the ear of the hearing-impaired user so that the hearing-impaired user can hear the external sounds clearly.

[0101] Understandably, amplifiers can amplify all signals indiscriminately. Of course, amplifiers can also be adjusted according to the hearing loss of hearing-impaired users. For example, an amplifier can focus on amplifying frequency ranges that hearing-impaired users cannot hear. For instance, if an elderly person is not sensitive to high-frequency sounds (such as birdsong or a woman's voice), the amplifier will amplify this part of the signal so that the elderly person can clearly obtain this part of the sound wave signal. Furthermore, for frequency ranges that hearing-impaired users can still hear, the amplifier will amplify them appropriately or not at all to avoid the sound being too loud and causing discomfort.

[0102] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0103] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An open-type acoustic device, characterized in that, It includes a fixing part and a sound-generating component, wherein the sound-generating component includes: A first housing, wherein the first housing is provided with a sound outlet, and the portion of the first housing having the sound outlet can extend into the user's concha cavity; A second housing, connected to the first housing, with one end of the second housing away from the first housing connected to the fixing part; and An adjustment structure is provided, which connects the first housing and the second housing. The adjustment structure allows the first housing to rotate relative to the second housing, thereby adjusting the sound outlet to be aligned with the user's ear canal.

2. The open acoustic device as described in claim 1, characterized in that, The adjustment structure allows the first housing to swing in different directions relative to the second housing, thereby adjusting the sound outlet to be aligned with the user's ear canal.

3. The open acoustic device as described in claim 2, characterized in that, The adjustment structure includes a flexible deformation structure, one end of which is connected to the first housing and the other end of which is connected to the second housing, so that the first housing can swing relative to the second housing in different directions.

4. The open acoustic device as described in claim 3, characterized in that, The flexible deformable structure is a bellows, which has a first end and a second end that are disposed opposite to each other along its length. The first end is rotatably connected to the first housing, and the second end is fixedly connected to the second housing; Alternatively, the first end is fixedly connected to the first housing, and the second end is rotatably connected to the second housing.

5. The open acoustic device as described in claim 4, characterized in that, A receiving groove is provided on one of the first housing and the first end, and a rotary joint is provided on the other of the first housing and the first end, the rotary joint being rotatably disposed in the receiving groove.

6. The open acoustic device as described in claim 4 is characterized in that, The sound-generating component also includes a gasket. A first stop groove is provided on the outer peripheral wall of the bellows. The gasket is embedded in the first stop groove and abuts against the inner wall of the second housing.

7. The open acoustic device as claimed in claim 4 further includes a speaker unit, a circuit board, and wires, wherein the speaker unit is disposed within the first housing, the circuit board is disposed within the second housing, the speaker unit and the circuit board are electrically connected via the wires, and the wires pass through the corrugated pipe.

8. The open acoustic device as described in claim 4, characterized in that, The sound-generating component also includes a sealing element. A second stop groove is provided on the outer peripheral wall of the bellows. The sealing element is embedded in the second stop groove and is interference-fitted with the first housing and / or the second housing.

9. The open acoustic device as described in claim 2, characterized in that, The adjustment structure includes a universal joint structure.

10. The open acoustic device as described in claim 1, characterized in that, The adjustment structure allows the first housing to rotate relative to the second housing, thereby adjusting the sound outlet to be aligned with the user's ear canal.

11. The open acoustic device as described in claim 10, characterized in that, The centerline of the sound outlet is set at an angle to the rotation axis of the first housing.

12. The open acoustic device as claimed in claim 1, characterized in that, The adjustment structure can also adjust the distance between the first housing and the second housing.

13. The open acoustic device according to any one of claims 1 to 12, characterized in that, The fixing part is movably connected to the second housing, and the second housing can swing relative to the fixing part so that the open-back acoustic device can switch between an open-back wearing state and an in-ear wearing state.

14. The open acoustic device as described in claim 13, characterized in that, The second housing is provided with an opening and a guide groove communicating with the opening. The fixing part includes an ear hook body and a connector connected to each other. The ear hook body passes through the opening, and the connector is located in the guide groove and can slide along the guide groove.

15. The open acoustic device as described in claim 14, characterized in that, The guide groove extends circumferentially along the end of the second housing near the fixing part, and the connecting member is adapted to the shape of the guide groove.

16. The open acoustic device according to any one of claims 1 to 12, characterized in that, It also includes a third housing, which is connected to the second housing at opposite ends of the fixing part, and a battery is disposed inside the third housing.

17. The open acoustic device as described in claim 16, characterized in that, The third housing and the first housing are both located on the same side of the second housing.

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