Head-mounted sound production equipment

Abstract

The utility model discloses head-mounted sound production equipment, which relates to the technical field of sound production devices, and comprises a function bin and a rear hanger, and the function bin comprises a shell; the rear hanger comprises an outer skin layer and a connector connected to the end of the outer skin layer, the connector is connected with the shell in an inserted mode and does not communicate with the peripheral face of the outer skin layer, the end of the outer skin layer comprises a first outer end face and at least one second outer end face, the first outer end face and the second outer end face are not coplanar, and the first outer end face and the at least one second outer end face are arranged on the outer skin layer. And the first outer end face and the at least one second outer end face are in contact with the shell. The contact area is increased through the contact between the at least two non-coplanar surfaces and the shell, so that the sealing and waterproof effects of the connection position of the rear hanger and the functional bin can be improved, and the waterproof performance of the earphone is ensured.

Description

[0001] Priority Information: This application claims priority to Chinese Patent Application No. 202411184984.3, filed on August 27, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The utility model relates to sound production device technical field, especially head-mounted sound production equipment. BACKGROUND

[0003] Head-mounted sound production equipment, such as earphones, all include sound production devices capable of producing sound. According to different sound transmission methods, sound production devices can be divided into bone conduction sound production devices and air conduction sound production devices. Earphones containing bone conduction sound production devices are usually referred to as bone conduction earphones.

[0004] A known earphone structure includes two earphone heads, two function compartments, a rear hanging structure connected between the two function compartments, and ear hangers connected between the function compartments and the earphone heads. The number of ear hangers is two. When the earphones are worn, the ear hangers are hooked around the ears of the human body, and the rear hanging structure is wrapped around the back of the head. The function compartments can contain control circuit boards and / or batteries. Usually, one function compartment mainly installs a control circuit board (commonly referred to as a control compartment), and the other function compartment mainly accommodates a battery (commonly referred to as a battery compartment).

[0005] Earphones can not only be used as office entertainment products, but also can be used during exercise, such as when running. Some bone conduction earphones with good waterproof performance can even be used when swimming.

[0006] Although earphone products have become increasingly mature, there is still room for improvement. For example, when using earphones during exercise, if the earphones are not worn firmly enough, they can easily sway up and down, affecting the use experience and listening experience, and even possibly falling off.

[0007] For another example, if the design of the rear hanging structure is unreasonable, in some cases (such as when the rear hanging structure is bent), a bending point can easily occur, causing the rear hanging structure to not reliably return to its original state and permanently deform, affecting the normal use of the earphones. Further, the outer skin layer of some earphone rear hanging structures can even break when a large bend occurs, affecting the appearance and reliability of use.

[0008] For another example, the torsional resistance of some earphone rear hanging structures is poor. When the earphones are worn, the two earphone heads can easily become misaligned vertically, affecting the listening experience and the comfort of wearing.

[0009] In addition, when used in a humid environment (such as when swimming or in the rain), the waterproof performance of the earphones is required to be high. The connection between the rear hanging structure and the function compartment of some earphones is through a plug-in structure. If water leakage occurs at the plug-in part, it can also affect the reliability of the use of the earphones.

[0010] As Figure 26 and Figure 27 shown, Figure 26 and Figure 27 shows the plug-in structure diagram of the rear hanging and the function warehouse of some earphones, the rear hanging 90 includes a connector 91, which is connected with the shell clamping hook of the function warehouse. The connector 91 of this structure has some defects, for example:

[0011] First, in order to ensure the elasticity of the clamping hook structure, the connector 91 is an injection molded plastic part, in order to ensure its strength, it needs to have a certain volume and thickness, otherwise after combining with the matched function warehouse 92, it will be insufficient in strength, easy to shake or break with a little force. Moreover, the tail of the connector 91 needs to have a clamping hook 93 to be clamped on the function warehouse, so that part of the function warehouse 92 will inevitably occupy a certain space, resulting in that the related plastic parts cannot be made small, and the volume of the function warehouse is relatively large. Further, the function warehouse 92 needs to be provided with a tubular connecting part 920 extending outward to accommodate the connector 91, further increasing the volume and structural complexity of the function warehouse 92. When the functions of the earphone gradually increase, certain devices will inevitably be added, and the volume of the function warehouse will be too large, causing discomfort when worn.

[0012] Second, when the earphone is involved in water, water may enter the connector 91 along the assembly gap between the ear hanging and the function warehouse, and the connector 91 is generally made of PA66. Although this material has high strength, it has relatively strong hygroscopicity, and after contacting with water, the overall volume will increase and maintain for a relatively long time. At this time, the expanded part of the connector 91 will expand the part of the plastic shell body matched therewith, and the plastic shell body will generate a large internal stress that cannot be released. After a period of time, cracks will appear on the shell body or local parts will fall off, causing function failure, seriously affecting product quality and user experience, and maintenance after failure is very difficult, which will also increase the after-sales cost.

[0013] Third, the contact surface 94 between the rear hanging 90 and the function warehouse 92 is usually a single plane, and the waterproof area for preventing water from entering the function warehouse 92 is limited. If glue is applied between the contact surface 94 of the function warehouse 92 and the rear hanging 90 for sealing, because the area is relatively small, it will cause glue overflow and cause appearance defects.

[0014] Fourth, the connection strength of the connector 91 of some earphones and the outer skin layer 22 is not enough, which may cause the connector 91 to be peeled off or fall off from the outer skin layer 22.

[0015] In summary, there is still room for improvement in the comfort of wearing, structural reliability and waterproof performance of the earphone.

[0016] The above content is only used to help understand the technical solutions of the present application, and does not constitute an acknowledgement of the above as prior art. Utility model content

[0017] The utility model discloses a head-mounted sound production equipment to solve at least one problem existing in the prior art.

[0018] To realize the utility model purpose described above, the utility model provides a head-mounted sound production equipment, comprising:

[0019] The functional compartment comprises a shell; and,

[0020] The rear hanging comprises an outer skin layer and a connector connected to the end of the outer skin layer, the connector is inserted with the shell, and the outer skin layer is not communicated with the outer peripheral surface, the end of the outer skin layer comprises a first outer end surface and at least one second outer end surface, the first outer end surface and the second outer end surface are not coplanar, and the first outer end surface and at least one second outer end surface are in contact with the shell.

[0021] Compared with the prior art, the utility model has the beneficial effects that according to at least one embodiment of the utility model, the head-mounted sound production equipment comprises a functional compartment and a rear hanging, the rear hanging comprises an outer skin layer and a connector connected to the end of the outer skin layer, the connector is inserted with the shell, and the outer skin layer is not communicated with the outer peripheral surface, the outer skin layer of the rear hanging comprises a first outer end surface and at least one second outer end surface which are not coplanar, the first outer end surface and at least one second outer end surface are in contact with the shell of the functional compartment connected with the rear hanging, the contact area is increased by the contact of at least two surfaces which are not coplanar with the shell, the sealing and waterproof effect of the connection position of the rear hanging and the functional compartment can be improved, and the waterproof performance of the earphone is ensured. DRAWINGS

[0022] Figure 1 It is a perspective schematic view of the head-mounted sound production equipment according to some embodiments of the present specification.

[0023] Figure 2 It is a schematic view of a sound production unit of the head-mounted sound production equipment according to some embodiments of the present specification.

[0024] Figure 3a It is a perspective schematic view of the rear hanging according to some embodiments of the present specification.

[0025] Figure 3b It is Figure 3a The explosion view of the rear hanging shown in the figure.

[0026] Figure 4a It is Figure 1 The top view of the head-mounted sound production equipment shown in the figure.

[0027] Figure 4b It is Figure 1 The side view of the head-mounted sound production equipment shown in the figure.

[0028] Figure 5 is Figure 3a a rear hanging main view.

[0029] Figure 6 is a sectional view along Figure 5 A-A section line in the middle.

[0030] Figure 7 is a structural schematic diagram of the outer skin layer according to some embodiments of the present specification, in which the outer skin layer is cut off at the middle position.

[0031] Figure 8 is Figure 7 a schematic diagram of the outer skin layer end.

[0032] Figure 9 is Figure 1 a three-dimensional schematic diagram of the connection between the functional bin and the rear hanging.

[0033] Figure 10 is a three-dimensional schematic diagram of the functional bin according to some embodiments of the present specification.

[0034] Figure 11a is a three-dimensional schematic diagram of the outer skin layer end according to some embodiments of the present specification.

[0035] Figure 11b is Figure 11a a side view of the outer skin layer end.

[0036] Figure 12 is a connection schematic diagram of the functional bin and the rear hanging according to some embodiments of the present specification.

[0037] Figure 13a is a schematic diagram of the outer skin layer end according to some embodiments of the present specification.

[0038] Figure 13b is a schematic diagram of the outer skin layer end according to some embodiments of the present specification.

[0039] Figure 14 is a schematic diagram of the rear hanging end according to some embodiments of the present specification.

[0040] Figure 15 is Figure 3a an enlarged view of the I part.

[0041] Figure 16 is a connection schematic diagram of the connector and the locking piece according to some embodiments of the present specification, in which the number of locking pieces is one.

[0042] Figure 17 is a position schematic diagram of the locking piece and the shell according to some embodiments of the present specification, in which the number of locking pieces is one.

[0043] Figure 18 This is a cross-sectional schematic diagram showing the connection between a locking element and a housing and a connector according to some embodiments of this specification, wherein the number of locking elements is one.

[0044] Figure 19 This is a connection diagram of connectors and locking elements according to some embodiments of this specification, wherein there are two locking elements.

[0045] Figure 20 This is a cross-sectional view of the connection between the locking element and the housing and connector according to some embodiments of this specification, wherein there are two locking elements.

[0046] Figure 21 This is a top view of a connector according to some embodiments of this specification.

[0047] Figure 22 This is a schematic diagram of the rear attachment end according to some embodiments of this specification.

[0048] Figure 23 This is a schematic diagram of the rear end of a connector according to some embodiments of this specification, in which an elastic metal wire extends out of the connector.

[0049] Figure 24 yes Figure 23 Side view of the structure shown.

[0050] Figure 25 This is a cross-sectional view of a connector according to some embodiments of this specification.

[0051] Figure 26 These are three-dimensional schematic diagrams showing the connection between the rear-mounted hook and the functional compartment in some embodiments.

[0052] Figure 27 These are cross-sectional schematic diagrams showing the connection between the rear hanger and the functional compartment hook in some embodiments. Detailed Implementation

[0053] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0054] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0055] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] like Figure 1 As shown in the embodiments described in this specification, a head-mounted sound-generating device can be worn on the human head to enable a person to hear sound, for example, through bone conduction and / or air conduction. The head-mounted sound-generating device includes a sound-generating unit 10 and a wearing mechanism 11 connected to the sound-generating unit 10. The sound-generating unit 10 is used to emit sound, and the wearing mechanism 11 is used to wear the sound-generating unit 10 on the human head so that the sound can be easily heard. For example, the sound-generating unit 10 is worn at a position corresponding to the human ear.

[0057] Figure 1 The headset shown is a binaural headphone, comprising two speaker units 10 (or earpieces), a back hook 2 adapted to wrap around the back of the head, two ear hooks 3 adapted to hook onto the ears, and two functional compartments 4. The functional compartments 4 house a control circuit board and / or a battery; for example, one functional compartment 4 houses the control circuit board, and the other a battery compartment. Alternatively, each functional compartment 4 may house both the control circuit board and / or a battery. The back hook 2 connects between the two functional compartments 4. Each speaker unit 10 is correspondingly positioned to one of the two functional compartments 4, and the speaker units 10 and their corresponding functional compartments 4 are connected via the ear hooks 3. Taking the two functional compartments 4 as a control compartment and a battery compartment respectively, the back hook 2 connects between the control compartment and one of the speaker units 10, and the battery compartment is connected to the other speaker unit 10 via an ear hook 3. The headset is symmetrical overall to improve wearing comfort.

[0058] Optionally, the head-mounted sound device is a bone conduction headphone, in which the sound-generating unit 10 is equipped with a bone conduction sound-generating device 100 capable of generating vibrations. When the bone conduction headphone is in use, the sound-generating unit 10 is located in front of the ear and in contact with the facial skin. It transmits mechanical vibrations to the skin and then to the human auditory system, allowing the person to hear sound. Further optionally, the sound-generating unit 10 of the head-mounted sound device also includes an air conduction sound-generating device 101, which can generate air conduction sound through diaphragm vibration. The sound-generating unit 10 is provided with a sound outlet 1021 for emitting air conduction sound.

[0059] Figure 2 In the illustrated embodiment, the sound-generating unit 10 includes a housing assembly 102 and a bone conduction sound-generating device 100 and an air conduction sound-generating device 101, both disposed within the housing assembly 102. The housing assembly 102 has a proximal end 1020 close to the ear when the head-mounted sound-generating device is worn. The air conduction sound-generating device 101 is disposed relative to the bone conduction sound-generating device 100 near the proximal end 1020 and is configured to emit sound toward the proximal end 1020. The proximal end 1020 is provided with a sound outlet 1021, thus, the air conduction... The sound-generating device 101 can be positioned close to and towards the ear, which helps improve the directness and clarity of the sound, reduces sound loss and distortion, allows the user to hear a larger air-conducted sound, and results in higher sound generation efficiency and better effect. Furthermore, it allows for a reduction in the size of the air-conducted sound-generating device 101, facilitating miniaturization. Additionally, the bone conduction sound-generating device 100 is located further from the sound outlet 1021, reducing interference caused by internal sound waves emanating from the sound outlet 1021 during vibration. It is understood that the proximal end 1020 is also the end of the outer shell assembly 102 closest to the functional compartment 4, and the sound outlet 1021 is located on the end face of the outer shell assembly 102 facing the functional compartment 4. It is understood that although this specification uses a binaural earphone as an example, head-mounted sound-generating devices are not limited to binaural earphones; they can also include hearing aids, audio glasses, VR devices, AR devices, and other electronic devices.

[0060] In some embodiments, such as Figure 3a and Figure 3b As shown, the backrest 2 includes a wire 20, an elastic metal wire 21, and an outer sheath 22 covering the wire 20 and the elastic metal wire 21. Both ends of the backrest 2 are connected to two functional compartments 4. The wire 20 extends into the functional compartment 4 and is electrically connected to the electronic components within the functional compartment 4. The elastic metal wire 21 allows the backrest 2 to maintain a specific shape and provides a clamping force (or contact force, squeezing force, etc.) to keep the sound-generating unit 10 pressed tightly against the facial skin during use. In some embodiments, the backrest 2 also includes two connectors 23 located at both ends of the outer sheath 22, which are used for insertion and fixation with the functional compartments 4.

[0061] It should be noted that the accompanying drawings in this application are schematic diagrams of the structure of the head-mounted sound device in its natural state when it is not worn.

[0062] In some embodiments, such as Figure 4a As shown, Figure 4a A top view of a head-mounted sound device is shown, in its natural state, with the device symmetrical about plane 2a. The outer skin layer 22 of the backrest 2 includes a first curved portion 2b and two second curved portions 2c located at opposite ends of the first curved portion 2b. Figure 4a In the diagram, the approximate boundary between the first curved portion 2b and the second curved portion 2c is shown by a dashed line. The first curved portion 2b is arc-shaped and symmetrical about the plane of symmetry 2a. The second curved portion 2c extends away from the first curved portion 2b and curves towards the side of the plane of symmetry 2a (e.g., it can be an arc or other curve). The two second curved portions 2c are symmetrical about the plane of symmetry 2a. Optionally, the second curved portion 2c is curved, for example, a curve with varying curvature. The arc curvature is uniform, so when the user wears the headphones, the force on each point within the first curved portion 2b of the back hook 2 is uniform, and the clamping force on the left and right ears is more uniform. The back hook 2 is less likely to develop a kink (fixed force point) due to excessive curvature changes. A kink may cause the back hook 2 to twist vertically, resulting in uneven force on the left and right sides, causing discomfort when wearing it. In severe cases, due to long-term uneven force, it may even break.

[0063] In the embodiments described in this specification, the plane containing the center line of the portion of the elastic metal wire 21 corresponding to the first bent portion 2b is the reference plane B. The top-view direction is perpendicular to the reference plane B, and the head-mounted sound device is observed from top to bottom. Optionally, the center line of the elastic metal wire 21 is located on the reference plane B. The earphone has a width direction perpendicular to the plane of symmetry 2a and a length direction parallel to the plane of symmetry 2a. The rear hook 2 has two outermost left endpoints O4 and O5 in the width direction of the earphone, and an outermost rear endpoint O6 in the length direction. The plane formed by the left endpoint O4, right endpoint O5, and rear endpoint O6 is parallel (or approximately parallel) to the reference plane B and is close in distance (or even coincides), and can be approximated as the reference plane B.

[0064] The first curved portion 2b being arc-shaped can be understood as having an arc-shaped centerline. The midline between the inner and outer contours of the first curved portion 2b in a top-view direction can be approximated as the centerline of the first curved portion 2b, with the midline equidistant from the inner and outer contours (for example, multiple positions can be taken on the inner and outer contours of the first curved portion 2b, and the line connecting the midpoints in the width direction of each position can form the midline). Similarly, the second curved portion 2c being curved can be understood as having a curved centerline. The midline between the inner and outer contours of the second curved portion 2c in a top-view direction can be approximated as the centerline of the second curved portion 2c, with the center O3 being the center of the circle containing the centerline. Figure 4a The intermediate lines 2g and 2h shown in the diagram are the intermediate lines of the first curved portion 2b and the second curved portion 2c, respectively.

[0065] In some embodiments, the diameter of the first curved portion 2b ranges from 80 to 120 mm, where the diameter refers to the diameter of the center line of the first curved portion 2b in the top view. If the diameter is too large, the clamping force is too weak, making the earphones prone to falling off; if the diameter is too small, the clamping force is too tight, causing pressure pain. Further optionally, the diameter of the first curved portion 2b ranges from 90 to 110 mm, and even more preferably from 95 to 105 mm, for example, 95 mm, 100 mm, or 105 mm. This allows the rear hook 2 to have a more suitable clamping force, resulting in a more comfortable fit and stable wearing even during exercise, preventing it from loosening or falling off.

[0066] In some embodiments, the central angle α1 of the first curved portion 2b ranges from 100° to 180°. The central angle α1 is the angle between the center O3 of the first curved portion 2b and the two connecting lines 2e between the two ends of the first curved portion 2b. For example, the center O3 and the two ends of the middle line of the first curved portion 2b can be connected to form two connecting lines 2e. The connecting lines 2e can also serve as the boundary line between the first curved portion 2b and the second curved portion 2c. If the angle is too large, the overall clamping force of the headphones will be too tight, and wearing them may cause pressure pain. If the angle is too small, the overall clamping force of the headphones may be reduced, and due to the uneven curvature of the back hook 2, a fixed force point may be easily generated, and the back hook may easily break. Further optionally, the central angle α1 of the first curved portion 2b ranges from 110° to 150°, and even more specifically, it can be 115° to 125°, for example, it can be 115°, 120°, or 125°, etc. This further ensures that the rear hanger 2 has appropriate clamping force and improves wearing comfort.

[0067] Continue to refer to Figure 4aIn a top-down view, the backrest 2 has a reference surface 2f, which is a plane passing through the center O3 of the first curved portion 2b and perpendicular to the symmetry plane 2a and the reference plane B. When the central angle α1 is less than 180°, the two ends of each second curved portion 2c are located on both sides of the reference surface 2f, and the distance D6 between the portions of two second curved portions 2c located at the reference surface 2f along the width direction of the head-mounted sound device is greater than the distance D1 and D7 between their ends along the width direction of the head-mounted sound device. Here, the distance refers to the distance between the inner contours of the corresponding portions. In this way, the width of the backrest 2 gradually increases towards the reference surface 2f and gradually decreases after passing the reference surface 2f, which can better fit the head shape, provide clamping force, and make wearing more comfortable.

[0068] In some embodiments, the ratio of the length of the first curved portion 2b to the length of the outer skin layer 22 of the rear hanger 2 is 0.4 to 0.6. The lengths of both the first curved portion 2b and the outer skin layer 22 refer to the length of their centerlines. In a top-view orientation, half the sum of the lengths of the inner and outer contours of the first curved portion 2b (or the outer skin layer 22) can be approximated as the length of the centerline of the first curved portion 2b (or the outer skin layer 22). The length of the outer skin layer 22 does not include the covering portion 220 described below. It is understood that the clamping force is related to the length ratio of the first curved portion 2b to the outer skin layer 22. The larger the ratio, the greater the clamping force. Simultaneously, the larger the proportion of the first curved portion 2b, the more uniform the force on the rear hanger 2, and the less likely it is to develop a breakage point. Setting the ratio of the length of the first curved portion 2b to the length of the outer skin layer 22 of the rear hanger 2 to 0.4 to 0.6 helps to ensure both a suitable clamping force and further guarantee the overall anti-breakage performance of the rear hanger 2. Further optionally, the ratio of the length of the first curved portion 2b to the length of the outer skin layer 22 of the rear hanger 2 is 0.45~0.55, and even more preferably 0.47~0.53, to further ensure the effect.

[0069] In some embodiments, when the earphone is in its natural state, there is a gap distance D1 between the two ends of the outer skin layer 22. The gap distance D1 refers to the shortest distance between the two ends of the outer skin layer 22. The gap distance D1 is related to the clamping force when the earphone is worn. Optionally, the ratio of the gap distance D1 to the diameter of the first curved portion 2b is in the range of 0.5 to 1.2. The setting of the clamping force needs to take into account both wearing comfort and stability. The specific clamping force can be adjusted by the ratio of the gap distance D1 to the diameter of the first curved portion 2b. When the diameter of the first curved portion 2b is constant, the larger the ratio, the larger the distance between the two functional compartments 4. However, if the ratio is too large, it is easy to cause looseness, poor stability, and easy to fall off. The smaller the ratio, the smaller the distance between the two functional compartments 4, the tighter the fit, and the better the stability. However, if the ratio is too small, it is easy to cause pressure pain when wearing. Setting the ratio of the gap distance D1 to the diameter of the first curved portion 2b to a range of 0.5 to 1.2 can make the ratio range more suitable and the wearing stability and comfort better. Further optionally, the ratio of the spacing distance D1 to the diameter of the first curved portion 2b is in the range of 0.6 to 0.9, and even more optionally, the ratio of the spacing distance D1 to the diameter of the first curved portion 2b is in the range of 0.7 to 0.8, to further ensure the effect.

[0070] Optionally, the two functional compartments 4 extend away from the first curved portion 2b and converge towards the plane of symmetry 2a, as shown. Figure 4a As shown, in a top-down view, the inner surface of the functional compartment 4 has a contour line 4b. The angle α2 between the contour line 4b and the symmetry plane 2a is 15°~60°. When the contour line 4b is curved, the angle α2 can be the angle between the tangent of the most concave or most convex point of the contour line 4b and the symmetry plane 2a. If the angle is too large, it is easy to cause the wear to be too tight, which may cause pressure pain; if the angle is too small, it is easy to cause the wear to be too loose, which may cause the wear to fall off. Setting the angle α2 to 15°~60° is within a relatively suitable range, which is conducive to obtaining a suitable clamping force and ensuring the stability and comfort of the wear. Further optionally, the angle α2 is 20°~40°, and even more optionally, it is 25°~30°, to further ensure the effect.

[0071] Optionally, the extension direction of the functional compartment 4 is consistent with the extension direction of the end of the rear hanger 2, and also consistent with the extension direction of the connector 23, to facilitate installation and ensure clamping effect. The extension direction of the functional compartment 4 can be understood as the extension direction of its center line 4a, which is a line equidistant from the inner and outer contours of the functional compartment 4 in the top view (for example, multiple positions can be taken on the inner and outer contours of the functional compartment 4, and the line connecting the midpoints of the width direction of each position can form the center line).

[0072] The elasticity of the rear hanger 2 is mainly provided by the elastic metal wire 21. Therefore, the effective length of the rear hanger 2 can be considered as the length of the elastic metal wire 21. Optionally, refer to... Figure 4b The effective length of the back hook 2 (or the length of the elastic metal wire 21) ranges from 170 to 220 mm. The ear hook 3 has a contact point O7 with the ear. The contact point O7 can be approximated as the highest point of the inner contour of the headphone in the side view (left or right view). The distance D9 from the rear end point O6 of the back hook 2 to the contact point O7 along the length of the headphone is 100 to 140 mm. The effective length value and distance D9 are set with ergonomic considerations for wearing. When wearing the headphones, the back hook 2 needs to maintain a certain safe distance from the head. If the distance is too short, due to the stretching and deformation of the headphones, some users may find their heads hitting the back hook 2 and unable to wear them properly. If the distance is too long, the clamping force is too weak, making it easy for the headphones to loosen and fall off. It may also cause the back hook 2 to hit the seat or other obstacles during use, pushing up the headphones. At the same time, the back hook 2 is prone to vertical twisting and deformation when worn. During exercise, the tail of the back hook 2 will shake up and down, reducing the stability of the fit. Setting the effective length range of the rear hook 2 to 170~220mm and the distance to D9 to 100~140mm allows for a more suitable distance between the rear hook 2 and the head, ensuring wearing comfort and a secure clamping grip. Further options include an effective length of 180~210mm and a distance to D9 of 105~130mm; even further options include an effective length of 195~205mm (e.g., 195mm, 200mm, or 205mm) and a distance to D9 of 110~120mm (e.g., 110, 115, or 120mm) to further guarantee effectiveness.

[0073] Considering the ergonomics of the space for the temples of the glasses, optional, refer to Figure 1 By setting the geometry of the ear hook 3, the angle between the contact surface 10a of the earphone head and the human body and the inner surface 4c of the functional compartment 4 is set to 150°~170°. When the headset is worn on the head, because the contact surface 10a is tilted towards the face, the ear hook 3 and the functional compartment 4 will be tilted outward to some extent away from the head. This helps to create a gap between the ear hook 3 and the scalp, forming a space for placing the temples of glasses. This minimizes or eliminates interference between the temples of the glasses and the ear hook 3 (especially the bent part of the ear hook 3) when the user wears glasses, making it easier to wear glasses and headphones simultaneously and enhancing the stability of the glasses. The angle between the contact surface 10a and the inner surface 4c of the functional compartment 4 can be further selected as 160°~170°, and even further selected as 161°~165°.

[0074] Understandably, the rear hook 2, besides providing most of the clamping force, can also work in conjunction with the ear hook 3 and the functional compartment 4 to adjust the position of the sound-generating unit 10. When the sound-generating unit 10 includes an air-conducting sound-generating device 101 and a sound outlet 1021, the position of the sound outlet 1021 can be adjusted. After the ear hook 3 is set into a reasonable shape according to the above-mentioned angle rules, it cooperates with the structure, shape, size, and setting angle of the functional compartment of the rear hook 2 to make the sound outlet 1021 of the earphone head close to a suitable position next to the ear. This allows sound waves to enter the eardrum through the shortest possible propagation path in the air, thereby improving the low-frequency sensitivity of the earphone, reducing distortion, and helping to reduce or prevent contact with the tragus, thus improving wearing comfort. Understandably, the sound outlet 1021 needs to be positioned at a suitable distance from the ear. If the distance is too far, the propagation path becomes longer, the low-frequency sensitivity decreases, and distortion increases. Of course, it's not necessarily better to be as close to the ear canal as possible. The closer to the ear canal, the more the earphone head contacts the tragus. The tragus is a protruding cartilage structure that is more sensitive to vibrations and external contact. Although placing the sound outlet 1021 closer to the ear canal can increase sensitivity, the tragus's sensitivity can cause discomfort. Therefore, the sound outlet 1021 should be positioned at a suitable distance from the ear canal.

[0075] To enhance wearing comfort, the outer layer 22 is typically made of a soft, elastic material, providing a superior tactile experience when in contact with the skin. Common soft, elastic materials include silicone, TPU (thermoplastic polyurethane elastomer), TPE (thermoplastic elastomer), and rubber. In some embodiments, considering the extreme application scenarios of the back strap (high and low temperatures, high humidity, extreme bending and stretching, sweat and salt spray contamination) and the corresponding reliability testing requirements, the outer layer 22 may be made of silicone. Silicone possesses properties such as resistance to high and low temperatures, weather resistance, and aging resistance, fully meeting user needs and experience.

[0076] The hardness of the silicone material in the outer layer 22 also affects the wearing comfort and reliability. For example, if the outer layer 22 is too hard, not only will it feel uncomfortable to the touch, but its toughness will also decrease, making it prone to brittleness and cracking under stretching and compression. If the outer layer 22 is too soft, although it will feel relatively comfortable to the touch, its strength will be weakened, making it prone to irreversible deformation and damage. Optionally, the hardness (Shore A type) of the silicone material in the outer layer 22 can be in the range of 40° to 80° to provide a good feel while maintaining good toughness and strength, preventing brittleness, cracking, and deformation. Further options include a hardness of 50° to 70°, and even more specifically, 55° to 65°, to further ensure effectiveness.

[0077] In some embodiments, the weight of the back hook 2 ranges from 3 to 8g. The weight of the back hook 2 refers to the weight of the earphone excluding the sound unit 10, ear hook 3, and function compartment 4, including the weight of the wire 20, elastic metal wire 21, outer sheath 22, and connector 23 (if any). If the back hook 2 is too heavy, it will increase the overall weight of the earphone, affecting the wearing experience. Moreover, when wearing the earphone during exercise, the back hook 2 is prone to swinging up and down, making the earphone unstable. If the back hook 2 is too light, although it meets the lightweight design requirements of the earphone, the diameter of the elastic metal wire 21 is too small, resulting in poor strength and elasticity, making it easy to fall off. Alternatively, while ensuring the diameter of the elastic metal wire 21, the thickness of the outer sheath 2 cannot be guaranteed, which can easily cause the outer sheath 2 to crack when the back hook 2 is bent. To achieve a lightweight design while ensuring a balanced weight distribution across all components and a forward-oriented center of gravity, the weight of the earphones is set to 3-8g. This is a suitable weight distribution that minimizes movement during exercise and helps maintain the correct diameter of the elastic wire 21 and the thickness of the outer sheath 2, ensuring good elasticity and reliability. Alternatively, the weight of the earphones can be 4-7g, or even 5-6g, such as 5g, 5.2g, 5.4g, 5.6g, 5.8g, or 6g, to further enhance performance.

[0078] The outer sheath 22 has a minimum cross-section. The cross-section of the outer sheath 22 refers to the cross-section obtained by cutting the outer sheath 22 radially with a plane. The minimum cross-section is the cross-section with the smallest cross-sectional area among the obtained cross-sections. The cross-sectional area refers to the area of ​​the region enclosed by the outer contour of the cross-section. Optionally, the ratio of the diameter D8 of the elastic metal wire 21 to the width W2 of the minimum cross-section is in the range of 0.2 to 0.6. When the width W2 of the minimum cross-section of the outer sheath 22 is constant, if the ratio is too large, the elastic metal wire 21 will be too thick, the clamping force of the back hanger 2 will be too large, the wearing experience will be poor, and the outer sheath 22 will be relatively thin, making it more prone to breakage when bent. At the same time, during the production process, the wire 20 and the elastic metal wire 21 covered by the outer sheath 22 are prone to exposure, resulting in a low yield and increased production costs. If the ratio is too small, the clamping force will be too small, the wearer will easily fall off, and the wearing stability will be poor. Setting the ratio of the diameter D8 of the elastic wire 21 to the width W2 of the minimum cross-section to a range of 0.2 to 0.6 helps to make the diameter D8 of the elastic wire 21 and the thickness of the outer sheath 22 covering the elastic wire 21 more suitable, thereby obtaining a suitable clamping force, ensuring the bending performance of the outer sheath 22, and improving the reliability and comfort of use. Further optionally, the ratio of the diameter D8 of the elastic wire 21 to the width W2 of the minimum cross-section is in the range of 0.3 to 0.5, and even more preferably 0.35 to 0.45, to further ensure the effect.

[0079] Optional, such as Figure 5 and Figure 6 As shown, the smallest cross-section with the smallest cross-sectional area is located on the plane of symmetry 2a. In other words, the cross-section obtained by cutting the outer skin layer 22 through the plane of symmetry 2a is the smallest cross-section. At this point, the smallest cross-section of the outer skin layer 22 is the middle cross-section A (the cross-section passing through the middle position). For example, the outer contour of the cross-section of the outer skin layer 22 can be set to gradually decrease from the end 22a towards the middle 22b, so that the cross-section at the middle position has a smaller cross-sectional area. In this way, the mass of the middle part of the rear hanger 2 is relatively lighter than that of the end, which can further reduce swaying during movement and improve wearing stability. At the same time, the larger size of the end 22a of the outer skin layer 22 makes it easier to install mounting structures such as the fixing connector 23, achieving a better sealing effect.

[0080] In some embodiments, the outer skin layer 22 has a circular cross-section. In other embodiments, reference... Figures 6 to 8 The outer skin layer 22 has a flat cross-section, with the length of the cross-section greater than its width. For example, it could be... Figure 6The outer skin layer 22 is an ellipse. Optionally, the outer peripheral surface of the outer skin layer 22 is smoothly transitioned without any protrusions or depressions to make it more comfortable to wear. The outer peripheral surface of the outer skin layer 22 refers to the surface excluding the end faces at both ends. It is understood that when the cross-section is a regular shape (e.g., rectangle, ellipse, etc.) or an approximately regular shape, the length and width of the cross-section are interpreted in their usual sense. When the cross-section is an irregular shape, unless otherwise specified, the distance between the two points furthest apart on the outer contour of the cross-section is taken as its length, and the line connecting the two points is the length direction. The width direction is perpendicular to the length direction, and the width is the maximum dimension of the outer contour of the cross-section along the width direction. Optionally, the length direction X1 of the middle cross-section A of the outer skin layer 22 is perpendicular to the reference plane B, and the width direction Y1 is parallel to or coincides with the reference plane B. The length direction X2 of the end 22a of the outer skin layer 22 is not perpendicular to the reference plane B. That is, from the middle position of the outer skin layer 22 to its end 22a, the length direction of the cross-section of the outer skin layer 22 changes at an angle to improve the overall strength of the outer skin layer 22. Optionally, the angle variation is 60°~90°, that is, the angle between the length direction X1 of the intermediate section A and the length direction X2 of the end 22a of the outer skin layer 22 is 60°~90°. Further optionally, the length direction X2 of the end 22a of the outer skin layer 22 is parallel or coincident with the reference plane B. In this way, the length direction X1 of the intermediate section A of the outer skin layer 22 and the length direction X2 of the end 22a are perpendicular. From the middle position of the outer skin layer 22 to its end 22a, the length direction of the cross section of the outer skin layer 22 varies by an angle of 90°.

[0081] The length and width of the cross section can be controlled by controlling the dimensions of different parts of the outer skin layer 22. For example, from the middle 22b of the outer skin layer 22 to its end 22a, the dimensions of the outer skin layer 22 along the headphone height direction (in the illustrated embodiment, the headphone height direction is perpendicular to the reference plane B) remain unchanged or gradually increase. The dimensions of the outer skin layer 22 in the direction perpendicular to the headphone height direction gradually increase, and the rate of increase is greater than the rate of increase of the dimensions of the outer skin layer 22 along the headphone height direction. The closer to the end of the outer skin layer 22, the larger the dimension of the cross section perpendicular to the headphone height direction becomes, which can make the length of the end 22a of the outer skin layer 22 perpendicular to the length of the middle cross section A.

[0082] It is understandable that the middle section A has the smallest cross-sectional area and the lowest strength, making it most susceptible to torsional deformation. If torsional deformation occurs in the middle of the rear hook 2 during wear, the two sound units 10 will be misaligned vertically, affecting wearing comfort and stability. Setting the middle section A perpendicular to the reference plane B in the length direction X1 effectively improves the stiffness and strength of the middle section A in the length direction X1, thereby improving its resistance to torsion and preventing the sound units 10 from becoming misaligned during wear. Furthermore, at the end of the outer skin layer 22, due to its relatively larger cross-sectional area, its resistance to torsional deformation is better. When wearing the headphones, the end 22a is mainly subjected to bending force along the reference plane B. Setting the length direction of the first outer end face 2d parallel to or coincident with the reference plane B can improve its resistance to bending deformation in that direction, ensuring the connection strength between the outer skin layer 22 and the functional compartment 4.

[0083] It should be noted that while setting the cross-section of the intermediate section A to be perpendicular to the reference plane B in the length direction X1 can achieve relatively better torsional resistance, it is not necessary to be perpendicular. For example, when the length direction X1 forms an angle of 70° to 90° with the reference plane B, a good torsional resistance can still be achieved. Furthermore, the angle of change in the length direction of the cross-section of the outer skin layer 22 from its middle position to its end 22a does not necessarily have to be 90°; for example, it can be 60° to 90°. This allows for a relatively small angle between the length direction of the end of the outer skin layer 22 and the reference plane B, which is beneficial for improving its resistance to bending deformation in that direction and ensuring the connection strength between the outer skin layer 22 and the functional compartment 4. It also allows for a larger width W3 for the connector 23, further ensuring the connection strength between the rear hanger and the functional compartment.

[0084] To further ensure the torsional resistance of the rear hanger 2 and prevent the sound unit 10 from being misaligned when it is opened, optionally, at least the length direction of the cross section of the first curved portion 2b forms an angle of 70° to 90° with the reference plane B, further optionally, it is perpendicular to the reference plane B, and even more optionally, the length direction of the cross section of the first curved portion 2b is consistent with the length direction of the intermediate cross section A.

[0085] Optional, such as Figure 8 As shown, Figure 8A schematic diagram of the end of the outer skin layer 22 as seen along the insertion direction is shown. For clarity, structures such as holes for the mating of the outer skin layer 22 and the connector 23 are not shown. The ratio of the length L1 of the end of the outer skin layer 22 to the length L2 of the intermediate section A ranges from 3.2 to 1.2 to ensure good structural performance of the rear hanger 2 as a whole. In addition, when the area of ​​the intermediate section A meets the requirements, for example, when it is set to a certain value, if the ratio is too large, it will cause the length L1 and width W of the end 22a of the outer skin layer 22 to be too large. If the ratio is too large, the functional compartment 4 will be too bulky, affecting the appearance and increasing the overall weight, causing a shift in the center of gravity and reducing stability. If the ratio is too small, the connector 23 will be too small, making it easy for it to detach from the functional compartment 4. It will also result in the shell thickness (or body thickness, shell thickness, etc.) at the connector mating point being too thin, lacking strength and prone to cracking. Setting the ratio range to 3.2~1.2 makes the ratio more suitable, resulting in a more appropriate overall weight and size of the headphones, and better wearing stability and comfort. Further optionally, the ratio of length L1 to length L2 can be 3~1.9, and even more optionally, 2.7~2.2, to further ensure the effect.

[0086] Optionally, the width W2 of the intermediate section A can be 1.6~4mm. If the cross-section is too large, the size and weight of the back hook 2 will increase, affecting the wearing experience; if the cross-section is too small, it is easy to cause thread leakage and skin damage during use, resulting in a low yield rate during production. Further optionally, the width W2 of the intermediate section A can be 1.9~3.5mm, even more optionally 2.3~3.1mm, and even more optionally 2.7~2.9mm, for example, it can be 2.7mm, 2.8mm, or 2.9mm, etc., to make the width W2 of the intermediate section A more suitable.

[0087] It should be noted that the reference Figure 8 The width W1 and length L1 of the end 22a of the outer skin layer 22 refer to the width and length of the outer contour of the end 22a of the outer skin layer 22 projected onto a plane perpendicular to the insertion direction along the insertion direction. It should be noted that when the outer contour of the object is a regular shape (e.g., rectangle, ellipse, etc.) or an approximately regular shape, the length and width of the outer contour are interpreted in their usual sense. When the outer contour is an irregular shape, unless otherwise specified, the distance between the two points furthest apart on the outer contour is taken as its length, and the line connecting the two points is the length direction. The width direction is perpendicular to the length direction, and the width is the maximum dimension of the outer contour along the width direction. The insertion direction refers to the direction in which the rear hanger 2 is inserted into the functional compartment 4, and it is related to the extension direction (or length direction) of the connector 23 and the insertion hole 405 (see label). Figure 10 The axial directions are basically the same.

[0088] In some embodiments, the wire 20 is located inside the elastic metal wire 21, so that the elastic metal wire 21 can provide better protection for the wire 20. When the user bends it inward and hangs it, the wire 20 is less likely to be damaged or have poor contact due to stretching deformation. Further optionally, the center lines of the wire 20 and the elastic metal wire 21 are at least on the same plane (specifically the reference plane B) corresponding to the first bent portion 2b, to further improve the effect. Even more optionally, the center lines of the wire 20 and the elastic metal wire 21 are on the same plane.

[0089] The elastic metal wire 21 is made of elastic material, such as a single metal or an alloy material including multiple metal materials, such as aluminum alloy, magnesium alloy, titanium alloy, spring steel, etc. It can also be a composite material including metal and non-metal materials. Optionally, the material of the elastic metal wire 21 is titanium alloy, which has a strong memory function and can still return to its initial state after multiple (more than 10,000 times) bending deformation.

[0090] The average width between the traguss of an adult's ears is approximately 140mm. In some embodiments, to balance stability and comfort when the user wears the headphones, when the distance D1 between the headphone and the ends of the outer skin layer 22 is 140mm, the contact force of the sound unit 10 against the facial skin is 0.22~1.33N. During force measurement, one sound unit 10 of the headphones can be fixed to an external device, and the surface of the other sound unit 10 that will contact the face can be placed against a force sensor. The force sensor is then moved to push the other sound unit 10 away until the distance D1 between the two ends of the outer skin layer 22 is 140mm. The value of the force sensor is then read; this value is the contact force of the sound unit 10 against the facial skin. Further optionally, the contact force is 0.4~0.8N, and even more preferably 0.5~0.7N, to further improve the effect. It is understandable that the magnitude of the contact force can be adjusted through the relevant structures mentioned above. For example, the clamping force can be adjusted by parameters such as the curvature shape of the elastic metal wire 21, the diameter, the thickness of the outer skin layer 22, and the hardness of the outer skin layer 22, so that it is within a suitable range.

[0091] like Figure 3b , Figure 9 and Figure 10 As shown, the rear mount 2 is connected to the functional compartment 4 via connector 23. The functional compartment 4 includes a housing 40 with a connector hole 405, and connector 23 mates with connector hole 405. The outer sheath 22 can be injection molded to cover connector 23, wire 20, and elastic metal wire 21 for connection and fixation. Wire 20 passes through connector 23, and each end of elastic metal wire 21 is connected to a connector 23.

[0092] In some embodiments, the contact area is increased and the waterproofing effect is improved by providing at least two non-coplanar surfaces on the outer skin 22 that contact the outer casing 40. For example... Figure 11a and Figure 11b As shown, the end 22a of the outer skin layer 22 (in the illustrated embodiment, it is also the end of the second curved portion 2c) is provided with at least one groove 24, such that in addition to forming a first outer end face 2d located on the outer side, the end 22a of the outer skin layer 22 also forms at least one second outer end face 240. The second outer end face 240 is the bottom surface of the groove 24, and the side surface of the groove 24 is a connecting surface 241, which connects the second outer end face 240 and the first outer end face 2d. The number of grooves 24 can be one or more. In the illustrated embodiment, there are two grooves 24, thereby forming two second outer end faces 240. The two grooves 24 are located on the same side (upper side) of the first outer end face 2d, and their connecting surfaces 241 are coplanar. In the figure, the two grooves 24 have different depths, thus forming a stepped shape.

[0093] When the rear mount 2 is connected to the housing 40, the first outer end face 2d and the second outer end face 240 come into contact with the surface of the housing 40. For example... Figure 10 and Figure 12 As shown, the outer shell 40 is provided with a first contact surface 400 for contacting the first outer end face 2d, a second contact surface 401 for contacting the second outer end face 240, and a third contact surface 402 for contacting the connecting surface 241 of the groove 24. It can be understood that the number and position of the second contact surfaces 401 correspond to the number and position of the second outer end faces 240. When the rear hook 2 and the functional compartment 4 are connected, the first outer end face 2d and the first contact surface 400 are in contact, the second outer end face 240 and the corresponding second contact surface 401 are in contact, and the connecting surface 241 of the groove 24 and the third contact surface 402 are in contact. The non-coplanar arrangement of the first outer end face 2d and the second outer end face 240 increases the total contact area between the rear hook 2 and the outer shell 40, thereby increasing the sealing area at the connection point, improving the sealing effect, and enhancing the airtightness of the headphone connection point. Furthermore, the groove 24 can also serve a positioning function.

[0094] like Figure 11b As shown, the first outer end face 2d and the second outer end face 240 are offset from each other. The offset distance D3 between the adjacent ends of the first outer end face 2d and the second outer end face 240 can be selected as 1~3mm. The offset distance D3 can be understood as the width of the connecting surface 241 of the groove 24. If the offset distance is too large, it will result in an excessively long mating position, affecting the appearance and increasing the volume and weight. If the offset distance is too small, a good airtight effect cannot be achieved. Further optionally, the offset distance D3 is 1.5~2.5mm, and even more optionally, it is 1.7~2mm, in order to further achieve a balance between volume and weight and sealing effect.

[0095] In some embodiments, the first outer end face 2d and the second outer end face 240 are disposed in parallel. In other embodiments, reference is made to... Figure 11b The first outer end face 2d and at least one second outer end face 240 are not parallel, that is, the first outer end face 2d is inclined relative to the second outer end face 240, and there is a non-zero included angle between the two faces. Further optional, such as Figure 11a and Figure 11b In the illustrated embodiment, the first outer end face 2d and the two second outer end faces 240 are not parallel. Optionally, the included angle α3 between the first outer end face 2d and the second outer end face 240 is 10°~60°. The included angle between the first outer end face 2d and the second outer end face 240 will make at least one of the faces inclined, thereby increasing the contact area and improving the sealing performance. When the included angle α3 is too large, it will cause the mating position to be too long, affecting the appearance and increasing the volume and weight. When the offset distance is too small, the improvement in airtightness is not obvious. Setting the included angle α3 to 10°~60° is beneficial to make the length of the mating position more appropriate and improve the sealing performance. Further optionally, the included angle α3 is 30°~55°, and even more optionally, it is 40°~50°, for example, it can be 40°, 45° or 50°, to further ensure the effect.

[0096] Optionally, the first outer end face 2d is perpendicular to the insertion direction, or the end of the first outer end face 2d away from the second outer end face 240 is inclined in a direction away from the functional compartment 4, or the end of the first outer end face 2d away from the second outer end face 240 is inclined in a direction closer to the functional compartment 4, so as to increase the contact area with the outer shell 40.

[0097] Optionally, the second outer end face 240 is perpendicular to the insertion direction, or the end of the second outer end face 240 away from the first outer end face 2d is inclined toward the direction closer to the functional compartment 4, or the end of the second outer end face 240 away from the first outer end face 2d is inclined toward the direction away from the functional compartment 4.

[0098] Optionally, both the second outer end face 240 and the first outer end face 2d are inclined relative to the insertion direction (the insertion direction is consistent with the length direction of the connector 23) to further increase the contact area and improve the sealing effect.

[0099] Optionally, the connecting surface 241 is parallel to or coincides with the insertion direction.

[0100] It should be noted that when defining the included angle and relative position (e.g., parallel or non-parallel) between two surfaces, the surface may be a plane or a curved surface. When the surface is a plane, the included angle and relative position with the surface are the same as the included angle and relative position with the plane containing the surface. When the surface is a curved surface, the most convex or concave point of the curved surface has a tangent plane. In this case, the included angle and relative position with the surface can be understood as the included angle and relative position with the tangent plane of the surface. For example, the second outer end surface 240, the first outer end surface 2d, and the connecting surface 241 mentioned above can be either a plane or a curved surface (not necessarily both). When the second outer end surface 240 and / or the first outer end surface 2d and / or the connecting surface 241 are curved surfaces, the surface on the outer shell 40 that contacts them is also set as a curved surface so that the two can fit tightly together. Figure 11b In the illustrated embodiment, both second outer end faces 240 are curved surfaces, with their most concave point having a tangent plane 240a. The connecting surface 241 and the first outer end face 2d are planar surfaces. Angle α3 refers to the angle between the connecting surface 241 and the tangent plane 240a, and angle α4 refers to the angle between the first outer end face 2d and the tangent plane 240a. In other embodiments, the first outer end face 2d and the second outer end face 240 can be planar surfaces. It is understood that planar surfaces are easier to process and have better dimensional accuracy than curved surfaces. However, when the contact area between the outer shell 40 and the outer skin layer 22 is curved, the contact area is usually larger than that of a planar surface, which is beneficial for improving the sealing effect.

[0101] It is understandable that although this article describes the example of setting two grooves 24 at the end 22a of the outer skin layer 22, the end of the rear hanger 2 can be provided with one or more grooves 24, thereby forming one or more second outer end faces 240 and connecting faces 241. Furthermore, when multiple grooves 24 are provided, the arrangement of the grooves 24 is not limited; for example, they can be arranged along the length direction of the end 22a or along the width direction of the end 22a. (Reference) Figure 11a and Figure 13a , Figure 11a and Figure 13a Some embodiments are shown with two notches 24, wherein, Figure 13a In the illustrated embodiment, the two grooves 24 are arranged along the width direction of the end 22a, and the grooves 24 further away from the first outer end face 2d are deeper, forming two second outer end faces 240 with different depths on the same side of the first outer end face 2d. Figure 11a In the illustrated embodiment, two grooves 24 are arranged along the length of the end portion 22a, with one groove 24 being deeper, forming two second outer end faces 240 of different depths located on the same side of the first outer end face 2d. In other embodiments, a plurality of second outer end faces 240 may be located on both sides of the first outer end face 2d, see reference. Figure 13bThere are three grooves 24, with two grooves 24 on one side of the second outer end face 240 and one groove 24 on the other side. This forms two first outer end faces 240 and two connecting surfaces 241 on one side of the second outer end face 240, and one first outer end face 240 and one connecting surface 241 on the other side. Obviously, when there are only two second outer end faces 240, the two second outer end faces 240 can also be located on both sides of the first outer end face 240. It can be understood that when the number and position of the grooves 24 change, the position of the housing 40 and the rear hanger 2 end can be adjusted accordingly. The two are set in a contour-following manner to achieve mating, so that each second outer end face 240 fits against the housing 40, thereby further improving the sealing and positioning effect.

[0102] Optionally, when the end 22a of the outer skin layer 22 is provided with two or more second outer end faces 240, the first outer end face 2d and each of the second outer end faces 240 are arranged in parallel, or at least two of the first outer end face 2d and each of the second outer end faces 240 are not arranged in parallel, or each of the first outer end face 2d and each of the second outer end faces 240 is not arranged in parallel with each other, so as to further increase the contact area and ensure the sealing effect.

[0103] Understandably, the contact surfaces of the outer skin layer 22 and the outer shell 40 can be sealed with adhesive to further enhance the sealing effect and the connection strength between them. Since the contact surfaces between the outer skin layer 22 and the outer shell 40 have a relatively larger area, the adhesive application area increases, expanding the operating space. Furthermore, the adhesive, after being squeezed through the contact surfaces, can be more reliably retained between the contact surfaces of the outer skin layer 22 and the outer shell 40 without easily overflowing, thus ensuring a good appearance.

[0104] It is understandable that when there are multiple second outer end faces 240, it is not necessary for each second outer end face 240 to be in contact with the outer casing 40. When some of the second outer end faces 240 are in contact with the outer casing 40, a good waterproof effect can also be achieved. Of course, when all the first outer end faces 2d and the second outer end faces 240 are in contact with the outer casing 40, a better waterproof effect can be achieved.

[0105] It is understood that in other embodiments, the end 22a of the outer skin layer 22 may not have a groove 24, and there may only be a first outer end face 2d.

[0106] In some embodiments, the housing 40 has a rear end face 40a facing the side where the rear mount 2 is located, and a connector hole 405 is provided on the rear end face 40a and extends into the housing 40. Conventional connector-structured housings 40 typically have an outwardly extending tubular connecting portion 920 for connection with the connector 23, while Figure 10 In the embodiment shown, the housing 40 does not have a connecting portion 920 (see reference numerals) protruding from the rear end face 40a.Figure 26 and Figure 27 Instead, the connector 405 is directly opened on the rear end face 40a. The traditional tubular connecting part 920 is usually designed to be thickened based on the shape of the connector 23. Its wall thickness is relatively uniform and limited by the shape of the connector 23. Generally, the wall thickness of the connecting part 920 is set to be thin due to the limited structural space, which makes it prone to cracking. By eliminating the connecting part 920, the structure of the outer shell 40 can be made simpler, the structural strength is better, and the volume is smaller. The thickness of the material at the mating point of the outer shell 40 and the connector 23 is not limited by the structural space and can directly use the thickness of the outer shell 40. When the rear hanger 2 is subjected to outward bending force, the tensile strength of the connection point between the outer shell 40 and the rear hanger 2 is stronger and it is not easy to crack.

[0107] Optionally, the width W3 of connector 23 is greater than its thickness H1, and the width direction of connector 23 is consistent with the thickness direction Y3 of functional compartment 4 (including cases where they are parallel or nearly parallel). This ensures that the width direction of connector 23 is more aligned with the direction of the tensile force experienced at the connection point between the outer shell 40 and the rear hook 2 during headphone use. Since the width W3 of connector 23 is relatively larger than its thickness H1, the structural strength of connector 23 in the main stress direction can be improved. Further, optionally, the width direction of connector 23 is consistent with the length direction X2 of the end 22a of outer sheath 22, and the thickness direction is consistent with the width direction Y2 of the end 22a of outer sheath 22. This allows for a larger width, facilitating the arrangement of wires 20 and elastic metal wires 21 along the width direction of connector 23. The length direction of connector 23 is its extension direction, consistent with the insertion direction.

[0108] In some embodiments, reference Figure 14 and Figure 15The connector 23 has a flat first surface 23b. Optionally, the outer contour of the cross-section of the connector 23 perpendicular to the insertion direction is rectangular (including rectangular and approximately rectangular cases, for example, the four corners can be beveled or rounded), forming a relatively flat first surface 23b and a second surface 23c opposite to it, as well as two opposite side surfaces 23a connecting the first surface 23b and the second surface 23. The first surface 23b and the second surface 23c are located at both ends in the thickness direction of the connector 23, and the two side surfaces 23a are located at both ends in the width direction of the connector 23. Optionally, the first surface 23b and the connecting surface 241 are both planar, and the first surface 23b is parallel to the connecting surface 241 of the groove 24 (including parallel and nearly parallel cases), which is beneficial to improving the positional dimensional accuracy of both, facilitating the control of assembly process defects and gaps, and also making the appearance more aesthetically pleasing and the mold forming process simpler. Further optionally, the first surface 23b, the second surface 23c, and the side surfaces 23a are all planar, the first surface 23b and the second surface 23c are parallel, and the two side surfaces 23a are parallel.

[0109] In some embodiments, the outer peripheral surface of the connector 23 is provided with at least one boss 231 that protrudes radially (in a direction perpendicular to its length direction). The outer peripheral surface of the connector 23 refers to the surface of the connector 23 other than its two end faces in the length direction, including the first surface 23b, the second surface 23c, and the side surfaces 23a, etc. The boss 231 can be used for mold forming and positioning. When it is necessary to injection mold the outer skin layer 22 outside the connector 23, the boss 231 can be used to position the connector 23 with the mold, thereby improving the positioning accuracy, preventing misalignment and deformation, and reliably ensuring the connection strength between the connector 23 and the outer skin layer 22, reducing the risk of the connector 23 falling off the outer skin layer 22. For example, the boss 231 can be provided on at least one surface of the first surface 23b, the second surface 23c, or the two side surfaces 23a. Optionally, the boss 231 is provided on the first surface 23b or the second surface 23c. Since the width of the connector 23 is greater than its thickness, the first surface 23b and the second surface 23c have a relatively larger area, which is more conducive to setting the boss 231 and exerting its positioning effect. For example, at least one boss 231 can be provided on the first surface 23b of the connector 23, with the boss 231 protruding along the thickness direction of the connector 23. Optionally, at least a portion of the boss 231 may be exposed on the covering outer skin layer 22 so that it can be used for positioning when the rear hanger 2 is assembled with the housing 40, such as... Figure 10 and Figure 12 As shown, a positioning groove 4020 is provided on the outer shell 40. The positioning groove 4020 can be engaged with the boss 231 to realize the positioning of the connector 23 and the outer shell 40, so that the relative position between the outer skin layer 22 and the outer shell 40 that need to be attached is more accurate, thereby ensuring waterproof and sealing effect.

[0110] Optionally, the boss 231 is at least partially exposed in at least one slot 24. Figure 15 In the illustrated embodiment, the groove 24 is positioned above the first outer end face 2d. In this case, the first surface 23b is the top surface of the connector 23. In other embodiments, the groove 24 may also be positioned below the first outer end face 2d. In this case, the first surface 23b is the bottom surface of the connector 23.

[0111] The boss 231 can be partially exposed on the outer skin layer 22 or completely located outside the outer skin layer 22. When the boss 231 is partially exposed, it is partially covered by the outer skin layer 22, which can increase the contact area with the outer skin layer 22 and improve the connection force.

[0112] In some embodiments, the projected area of ​​the boss 231 on its surface (first surface 23b in the figure) along the thickness direction of the connector 23 is 0.5~2.5mm². If the projected area is too small, the boss 231 will lack strength and be prone to breakage, thus failing to provide a reliable positioning function. If the projected area is too large, it will increase the volume and affect the wall thickness of the mating housing 40, thereby affecting the strength of the housing 40. Setting the projected area to 0.5~2.5mm² helps to ensure both the positioning effect of the boss 231 and the structural strength of the housing 40. Further optionally, the projected area of ​​the boss 231 is 1~2mm², and even more preferably 1.4~1.7mm², to further ensure the effect.

[0113] In some embodiments, such as Figure 14 As shown, in the width direction of connector 23, the ratio of the length L5 of boss 231 to the width W3 of connector 23 is 0.2~1. If the ratio is too small, the boss 231 is not strong enough and its length is too short, so it cannot effectively play a positioning role. If the ratio is too large, the distance between the boss 231 and the edge of connector 23 is small, and the positioning effect of connector 23 in the length direction is worse. Further optionally, the ratio of the length L5 of boss 231 to the width W3 of connector 23 is 0.4~0.8, and even more preferably 0.5~0.6, to further ensure the effect. Optionally, boss 231 extends along the width direction of connector 23, and its length is consistent with the width direction of connector 23.

[0114] The connection method between connector 23 and function compartment 4 can be, for example, hook connection, riveting, screw fixing, etc. In some embodiments, connector 23 and function compartment 4 are fixed by a snap-fit ​​connection. Figures 16 to 18As shown, the head-mounted sound device also includes a locking component, which includes at least one locking arm 50. The connector 23 has a receiving portion 232 corresponding to the position and number of the locking arms 50. The housing 40 has a through hole 403 corresponding to the position and number of the locking arms 50, connecting to the insertion hole 405. Both the through hole 403 and the receiving portion 232 are used to insert the locking arm 50. When the locking arm 50 passes through the through hole 403 and is inserted into the receiving portion 232, part of it is located inside the housing 40 and part is located inside the connector 23, thus limiting the connector 23 and preventing it from exiting the insertion hole 405. The locking arm 50, the receiving portion 232, and the through hole 403 can also be fixed together by applying adhesive to further increase the strength of the connection and waterproof performance.

[0115] The containment section 232 may be, for example, a semi-enclosed slot (e.g.) Figure 19 As shown, it can be in communication with side surface 23a, or it can be a closed hole (e.g. Figure 16 As shown), the outer contour of the cross-section of the receiving part 232 obtained by cutting a plane perpendicular to the thickness direction of the connector 23 can be semi-closed or closed, or of course, it can be other shapes that can limit the locking arm 50. Figures 16 to 18 In the illustrated embodiment, the locking element is columnar, which can be understood as the locking element comprising only one locking arm 50. Adaptively, a receiving portion 232 is provided on the connector 23, and a through hole 403 is provided on the housing 40. The number of locking elements is not limited to one; there can be more, for example... Figure 19 and Figure 20 In the illustrated embodiment, there are two locking elements, located on both sides of the connector 23. Adaptively, the connector 23 has two receiving portions 232, and the housing 40 has two through holes 403. Furthermore, the locking elements are not limited to a columnar shape; for example, they can also be U-shaped, including two locking arms 50 extending in the same direction and a connecting portion connecting the two locking arms 50. Adaptively, the connector 23 has two receiving portions 232, and the housing 40 has two through holes 403. It is understood that two locking arms 50, compared to one locking arm 50, can improve the connection's strength and positioning effect; for example, when the hook 2 is pulled, it is less likely to break the locking arm 50.

[0116] Figure 19In the illustrated embodiment, there are two receiving portions 232. The axis of the receiving portions 232 is aligned with the thickness direction of the connector 23, and they are spaced apart along the width direction of the connector 23, respectively communicating with two side surfaces 23a. Thus, two locking arms 50 can be used to limit the positioning of the connector 23. Compared to using a single locking arm 50, two locking arms 50 can prevent the connector 23 from deflecting, resulting in better positioning. Compared to providing two closed-hole receiving portions, the reduction in the width dimension of the connector 23 can be reduced, ensuring the structural strength of the connector 23.

[0117] It is understandable that the receiving part 232 may or may not penetrate the connector 23, for example, it may be a blind hole. Optionally, the receiving part 232 may penetrate the connector 23 to improve the positioning effect and facilitate processing.

[0118] Optionally, the locking component can be made of metal, or more specifically, alloy, such as stainless steel (e.g., SUS304, SUS430), cobalt-nickel alloy, high-strength carbon steel, aluminum alloy (e.g., magnesium-aluminum alloy), titanium alloy, zinc alloy (e.g., lead-zinc alloy), or iron (here, iron refers to cast iron, i.e., iron-carbon alloy). Metal and alloy materials have good tensile strength, which helps to ensure the reliability of the locking component's connection to the plug-in 23.

[0119] Optionally, along the thickness direction of connector 23, the ratio of the projected areas of all receiving portions 232 and connector 23 on the same plane perpendicular to the thickness direction of connector 23 is 2% to 10%. The projected area of ​​receiving portions 232 and connector 23 refers to the area enclosed by the outer contours of the projected regions of receiving portions 232 and connector 23. The projected area of ​​all receiving portions 232 is the sum of the projected areas of all individual receiving portions 232. When calculating the projected area of ​​receiving portions 232, if the receiving portion 232 is an open groove, refer to... Figure 21 The two ends of the opening can be connected by a connecting line 232a to form a closed projection area. The projection area of ​​the connector 23 includes the projection area of ​​the receiving part 232. When the projection area of ​​the connector 23 is constant, if the ratio is too large, the receiving part 232 will be too large, which will affect the overall strength of the connector 23, and the connector 23 will be prone to breakage due to insufficient strength. If the ratio is too small, the notch of the receiving part 232 will be too small, the position of the receiving part 232 cannot be effectively positioned, and the cross-section of the clamping arm 50 will be too small, resulting in poor strength. Further optionally, the ratio of the projection areas of the receiving part 232 and the connector 23 on the same plane perpendicular to the thickness direction of the connector 23 is 3% to 6%, and even more preferably 3.5% to 5%, to further ensure the strength of the connector 23 and the clamping arm 50 and ensure the connection effect.

[0120] Optionally, when the connector 23 is secured by the locking element, the locking element is not exposed outside the housing 40 to ensure a good appearance. Further optionally, the locking element is located inside the housing 40 to prevent the user from easily removing it from the outside, improving product reliability. In some embodiments, such as Figure 10 , Figure 12 , Figure 17 and Figure 18 As shown, the outer casing 40 includes a main casing 404 and a cover 407 connected to the main casing 404. The main casing 404 has an open end 4040, which is sealed by the cover 407. The main casing 404 includes a first shell portion 4041 disposed opposite to the cover 407, a second shell portion 4042 located between the first shell portion 4041 and the cover 407, and two third shell portions 4043 disposed opposite to each other. The first shell portion 4041, the second shell portion 4042, and the cover 407 are arranged sequentially along the height direction Z3 of the functional compartment 4 and are all connected between the two third shell portions 4043. A connection hole 405 is formed between the first shell portion 4041, the second shell portion 4042, and the two third shell portions 4043. A through hole 403 is formed on the second housing portion 4042 and connects to the connector hole 405. When the locking member is inserted into the through hole 403 to position the connector 23, it will be located inside the outer housing 40. When the cover 407 is installed on the outer housing 40, the locking member is located in the closed space formed by the main housing 404 and the cover 407, and the locking member will not be visible from the outside, making it more aesthetically pleasing. Optionally, a receiving hole 406 corresponding to the through hole 403 is provided on the first housing portion 4041. The locking arm 50 can pass through the through hole 403 and enter the receiving hole 406, further improving the limiting effect and optimizing its force-bearing structure.

[0121] It is understood that in other embodiments, the locking element may also be exposed on the housing 40. The through hole 403 is not limited to being provided on the second housing portion 4042, for example, it may also be provided on the first housing portion 4041 or the third housing portion 4043. However, since the areas of the first surface 23b and the second surface 23c of the connector 23 are relatively large and have more sufficient space, it is preferable that the receiving portion 232 is provided on the first surface 23b and / or the second surface 23c. Correspondingly, the through hole 403 may be provided on the first housing portion 4041 or the second housing portion 4042.

[0122] Optionally, in some embodiments, when the connector 23 is stopped by two or more locking arms 50, the locking arms 50 are spaced apart along the length of the connector 23. In other embodiments, such as Figure 19 As shown, the card arms 50 are spaced apart along the width direction of the connector 23 to save space in the insertion direction.

[0123] Optionally, the axial direction of the clamp arm 50 and the through hole 403 is perpendicular to the insertion direction of the connector 23, so as to facilitate processing and assembly and to provide better limiting effect.

[0124] Compared to hook connections, pin riveting, and screw fixing, snap-fit ​​connections offer numerous advantages. For instance, with hook connections, the connector 23 is typically made of PA material, which is prone to moisture absorption and expansion, potentially causing cracking of the contact component (i.e., the outer shell 40). To improve waterproofing, a sealing ring is usually required on the outside of connector 23, making its structure more complex and increasing manufacturing processes and costs. Furthermore, the hook structure tends to increase the volume of the functional compartment, hindering its miniaturization. Similarly, pin riveting connections leave visible traces of the pin and plastic, requiring an external coating of elastic material like silicone, further increasing manufacturing processes and costs. Finally, screw fixing requires a larger structural space, which is not conducive to the lightweight design of bone conduction headphones.

[0125] The snap-fit ​​connection effectively positions and secures the connector 23. Simultaneously, the relatively simple structure and small space occupation contribute to cost reduction, enabling a lightweight design for the bone conduction headphones and enhancing their aesthetic appeal. Furthermore, combined with the multi-faceted contact sealing method described above, the sealing performance at the connection between the rear hook 2 and the functional compartment 4 can be reliably guaranteed.

[0126] Connector 23 can be made of high-strength materials with good tensile and yield strength, such as PA (polyamide), PA+GF (a composite material of polyacrylamide and glass fiber), or metal. Although PA and PA+GF materials can meet the high strength requirements, their moisture absorption and expansion can crack the shell to which they are assembled, affecting the reliability of use. Therefore, they can be used in relatively dry environments where the headphones are used.

[0127] Optionally, connector 23 can be made of metal, or more specifically, alloy materials, such as aluminum alloy (e.g., magnesium-aluminum alloy), zinc alloy, or magnesium alloy. Compared to PA and PA+GF, alloy materials have higher tensile strength and can be made smaller, allowing for further reduction in the volume of functional compartment 4, thus achieving a lighter design. Moreover, alloy materials do not absorb moisture and expand, resulting in better reliability and durability. For example, zinc alloys, among metal materials, balance lower density (6.75 g / cm³) and higher tensile strength. Under the same strength, the volume can be made smaller, and the thickness of the corresponding parts of the outer shell 40 and connector 23 can be increased, strengthening the structure, reducing cracking, and improving reliability. At the same time, the volume of the outer shell 40 can also be made smaller.

[0128] In some embodiments, connector 23 is made of metal, such as Figure 14As shown, the width direction of connector 23 is consistent with the length direction X2 of the end of outer skin layer 22. The ratio of the width W3 of connector 23 to the length L1 of the end of outer skin layer 22 is 0.4~0.8. When the width of the end of outer skin layer 22 is constant, if the ratio is too large, the weight of connector 23 will increase, the thickness of the outer skin layer 22 reserved on both sides will decrease, the airtightness of the assembly will be poor, and the waterproof effect will be poor. If the ratio is too small, connector 23 will be too small, the strength will be insufficient, the effect of connector 23 covering elastic metal wire 21 will be poor, and it will be easy to fall off the elastic metal wire 21. Further optionally, the ratio of the width W3 of connector 23 to the length L1 of the end of outer skin layer 22 is 0.5~0.7, and even more optionally, it is 0.55~0.65 to further ensure the effect and make the size of connector 23 and the size of the end of outer skin layer 22 more reasonable.

[0129] The outer skin layer 22 has a first outer endpoint O1 at its outermost end 22a along its length. To further ensure the strong connection between the connector 23 and the outer skin layer 22, the distance D4 between the connector 23 and the first outer endpoint O1 of the outer skin layer 22 in the width direction is 0.8~2mm. When the outer dimensions of the end 22a of the outer skin layer 22 are fixed, if the distance D4 is too large, the outer dimensions of the connector 23 in the width direction will be too small, resulting in poor overall strength and easy detachment from the elastic metal wire 21. If the distance D4 is too small, the outer dimensions of the connector 23 in the width direction will be too large, affecting the area of ​​the contact between the left and right sides of the rear hanger 2 and the outer shell 40, resulting in poor assembly sealing. Further optionally, the distance D4 is 1~1.6mm, and even more preferably 1.1~1.3mm, so that the dimensions of the connector 23 and the rear hanger 2 are more suitable, further ensuring the strong connection between the connector 23 and the outer skin layer 22 and the waterproof effect after the rear hanger 2 is connected to the functional compartment 4.

[0130] Furthermore, the position of connector 23 relative to outer skin layer 22 in the thickness direction also affects the firmness of the connection between connector 23 and outer skin layer 22 and the waterproof effect after the back hanger 2 is connected to the functional compartment 4. For example Figure 14As shown, the outer skin layer 22 has a second outer endpoint O2 on its outermost side in the width direction of its end 22a. In the thickness direction of the connector 23, the distance D5 between the connector 23 and the second outer endpoint O2 of the outer skin layer 22 is 0.8~2mm. The distance D5 refers to the distance between the first surface 23b and the second surface 23c of the connector 23 and the corresponding second outer endpoint O2, without considering bosses or similar structures on the surface. Similarly, when the outer dimensions of the end of the rear hanger 2 are fixed, if the distance D5 is too large, the outer dimensions of the connector 23 in the thickness direction will be too small, resulting in poor overall strength and easy detachment from the elastic metal wire 21; if the distance D5 is too small, the outer dimensions of the connector 23 in the thickness direction will be too large, affecting the area of ​​the contact area between the upper and lower sides of the rear hanger 2 and the outer shell 40, resulting in poor assembly sealing. Further optionally, the distance D5 is 1~1.6mm, and even more optionally 1.1~1.3mm, so that the dimensions of connector 23 and rear hanger 2 are more suitable, further ensuring the firmness of the connection between connector 23 and outer skin layer 22 and the waterproof effect after the rear hanger 2 is connected to the functional compartment 4.

[0131] It is understood that the connector 23 is not connected to the outer peripheral surface of the outer skin layer 22, and it is not exposed from the outer peripheral surface of the outer skin layer 22. This allows the surface of the end 22a surrounding the outside of the connector 23 to contact the outer shell 40 for a good sealing effect and to ensure the connection between the outer skin layer 22 and the connector 23. Optionally, the end 22a of the connector 23 relative to the outer skin layer 22 is centered to ensure a more consistent sealing effect around it. In some embodiments, the ratio of distance D4 to distance D5 is in the range of 0.9 to 1.1, so that the connector 23 has an outer skin layer 22 with similar thickness in both the width and thickness directions, allowing the connector 23 to be more firmly encased within the outer skin layer 22. Further optionally, the ratio of distance D4 to distance D5 is 1. In this case, the connector 23 has an outer skin layer 22 with the same thickness in both the width and thickness directions, further ensuring the reliability of the connection between the outer skin layer 22 and the connector 23.

[0132] In some embodiments, the ratio of the projected areas of the ends 22a of the connector 23 and the outer skin layer 22 on the same plane perpendicular to the length direction of the connector 23 is 0.2 to 0.7. The projected area refers to the area enclosed by the outer contours of the projected regions of the connector 23 and the outer skin layer 22 on the same plane. When the external dimensions of the ends of the outer skin layer 22 are constant, if the ratio is too large, the thickness of the portion covering the outside of the connector 23 will be thin, resulting in poor coverage and easy leakage of the connector 23; if the ratio is too small, the connector 23 will be small in size and weak in strength, making it susceptible to breakage under external forces. Setting the ratio to 0.2 to 0.7 is beneficial for ensuring both the connection strength between the connector 23 and the outer skin layer 22 and the structural strength of the connector 23. Further optionally, the ratio of the projected areas of the ends of the connector 23 and the outer skin layer 22 on the same plane perpendicular to the length direction of the connector 23 is 0.25 to 0.5, and even more preferably 0.3 to 0.4, to further ensure the effect.

[0133] It is understandable that, compared to connectors made of traditional plastic, connectors 23 made of metal materials usually have a smaller volume. Therefore, the distances D4 and D5 of the connectors 23 made of metal materials can be made relatively larger, and the ratio of the width W3 to the length L1 of the end of the outer sheath 22 and the ratio of the projected area of ​​the end 22a of the connector 23 and the outer sheath 22 can be made relatively smaller, thereby making the connection strength between the connector 23 and the outer sheath 22 better and less likely to separate from the outer sheath 22.

[0134] like Figure 12 and Figure 15As shown, the connector 23 is partially covered by the outer skin layer 22. The connector 23 has an inner end located inside the outer skin layer 22 and an outer end located outside the outer skin layer 22. Optionally, the ratio of the length L4 of the portion of the connector 23 exposed outside the outer skin layer 22 to the length L5 of the portion of the connector 23 located inside the outer skin layer 22 is 0.9 to 1.8. When the length L6 of the connector 23 remains unchanged, if the distance ratio is too large, the length L5 will be too short, and the connector 23 will easily fall off from the outer skin layer 22. If the distance ratio is too small, the length L4 will be too short, the insertion position of the connector 23 will be too short, the insertion position will be insufficient, and the rear hanger 2 will easily fall off the outer shell 40. Setting the ratio of length L4 to length L5 to 0.9 to 1.8 can make the connection length between the connector 23 and the outer skin layer 22 and the outer shell 40 more appropriate, which is beneficial to ensuring the reliability of the connection between the connector 23 and the outer skin layer 22 and the outer shell 40. The length L4 of the portion of connector 23 exposed outside the outer skin layer 22 refers to the dimension of the exposed portion of connector 23 along its length direction. Even partially exposed portions (e.g., the upper surface exposed, the lower surface not exposed) are included in the length dimension. The length L5 of the portion of connector 23 located inside the outer skin layer 22 can be obtained by subtracting length L4 from the length L6 of connector 23. In some embodiments, the length L4 of the portion of connector 23 exposed outside the outer skin layer 22 is greater than the length L5 of the portion of connector 23 located inside the outer skin layer 22 to further ensure the effective length of the connection between connector 23 and housing 40 at the insertion position, ensuring the strength and stability of the connection. Further optionally, the ratio of length L4 to length L5 is 1 to 1.6, and even more optionally, it is 1.2 to 1.4 to further ensure the reliability of the connection between connector 23 and outer skin layer 22 and housing 40.

[0135] To further improve the reliability of the connection between connector 23 and outer skin 22, such as Figure 16 As shown, the portion of connector 23 located within the outer skin layer 22 is provided with a first groove 233. The outer skin layer 22 is partially filled within the first groove 233, which increases the contact area between the outer skin layer 22 and connector 23, thereby improving the reliability of the connection between connector 23 and outer skin layer 22. The number of first grooves 233 can be one or more. Figure 16In the illustrated embodiment, one side surface 23a of the connector 23 in the width direction is provided with an outwardly protruding rib 235 extending along the length direction. Two first grooves 233 are naturally formed on both the upper and lower sides (in the thickness direction of the connector 23) of each rib 235, thus providing two first grooves 233 on the connector 23, effectively improving the firmness of the connection with the outer skin layer 22. In other embodiments, ribs 235 can be provided on both side surfaces 23a in the width direction of the connector 23 to form four first grooves 233. Optionally, the two ribs 235 on each side are symmetrically arranged. Optionally, the surface of the rib 235 is flush with the side surface 23a.

[0136] Alternatively, a protruding strip 236 is provided on the outer peripheral surface of the connector 23, which protrudes radially outward. The protruding strip 236 is located inside the outer skin layer 22. The protruding strip 236 can further increase the contact area with the outer skin layer 22 and can also play a hooking role, which helps to prevent the connector 23 from being pulled off the outer skin layer 22 and further improves the firmness of the connection between the connector 23 and the outer skin layer 22. Figure 16 In the illustrated embodiment, the protrusion 236 and the boss 231 are disposed on the same surface (specifically the first surface 23b) of the connector 23 and extend along the width direction of the connector 23. In other embodiments, the protrusion 236 may also be disposed on the second surface 23c or the side surface 23a. It is understood that the width of the connector 23 is relatively greater than its thickness. Therefore, disposing of the protrusion 236 on the first surface 23b or the second surface 23c can give the protrusion 236 a larger size, thereby improving the connection effect. Optionally, the protrusion 236 extends along the width direction of the connector 23.

[0137] To further improve the connection effect of the protrusion 236, optionally, along the length direction of the connector 23, the shortest distance between the end surfaces of the protrusion 236 and the outer skin layer 22 is not less than 0.6mm. This results in a relatively thicker outer skin layer 22 covering the front of the protrusion 236, providing better blocking effect for the connector 23 and making it less likely for the connector 23 to detach from the outer skin layer 22 along its length. Figure 12 As shown, optionally, the distance L9 between the protrusion 236 and the boss 231 is 2~5mm, which makes the outer skin layer 22 thicker between the boss 231 and the protrusion 236, further ensuring the connection strength. Figure 12 In the illustrated embodiment, the protrusion 236 is flush with the end face of the connector 23 located within the outer skin layer 22.

[0138] It is understandable that by providing structures such as the first groove 233 and / or the protrusion 236 on the connector 23, the connection strength between the connector 23 and the outer skin layer 22 can be effectively improved. Even if the length L5 of the portion of the connector 23 located inside the outer skin layer 22 is shortened, a good connection effect can still be guaranteed. In particular, when the connector 23 is made of metal, its volume may be relatively smaller, and the contact area with the outer skin layer 22 may also be smaller. By providing the above-mentioned structure, it is beneficial to better ensure the connection strength between the outer skin layer 22 and the connector 23.

[0139] In some embodiments, such as Figure 15 , Figure 16 and Figure 21 As shown, guide surfaces 2370 are provided on both sides of the outer end of connector 23 in the width direction. The two guide surfaces 2370 form a cone shape with a smaller outer diameter and a larger inner diameter, which serves to guide the connector 23 when it is inserted into the connector hole 405. The guide surfaces 2370 can be, for example, inclined surfaces or curved surfaces. The outer end of connector 23 refers to the end of its portion located outside the outer skin layer 22, and the inner end refers to the end of its portion located inside the outer skin layer 22. Figure 16 In the middle, the protrusion 236 is set on the inner end.

[0140] In some embodiments, a second groove 238 is provided on one or both sides of the outer end of the connector 23 in the width direction (consistent with the width direction of the connector 23). Figure 15 and Figure 16 In the illustrated embodiment, the second groove 238 is provided only on one side of the end of the connector 23. In other embodiments, the second groove 238 may be provided on both sides. A protruding positioning protrusion (not shown in the figure) that matches the second groove 238 is provided in the insertion hole 405 of the housing 40. When the connector 23 is inserted into the insertion hole 405, the positioning protrusion engages with the second groove 238, thereby providing a positioning function in the thickness direction, improving positional accuracy, and further ensuring that the contact surfaces of the housing 40 and the outer skin layer 22 can be accurately aligned and contacted, improving the sealing effect and the consistency of the overall assembly appearance difference. The appearance difference refers to the misalignment difference formed by the rear hanger 2 and the housing 40.

[0141] The number of second grooves 238 is not limited. For example, in some embodiments, one or both sides of the outer end of the connector 23 in the width direction can be provided with guide ribs similar to ribs 235 (not shown in the figure). The guide ribs protrude outward and extend along the insertion direction. Two second grooves 238 are formed on both sides of the guide ribs in the thickness direction (which is consistent with the thickness direction of the connector 23). A guide surface 2370 is formed on the guide ribs. A guide hole adapted to the guide ribs is provided in the insertion hole 405, thereby further achieving a positioning effect. Optionally, the outer surface of the guide ribs is flush with the side surface 23a.

[0142] Optional, see reference Figure 21 The length L8 of the second groove 238 is 0.5~1.2mm to ensure a good positioning effect. Alternatively, the length L8 of the second groove 238 can be 0.6~1mm, and even more preferably 0.7~0.9mm, to further guarantee the positioning effect. The length of the second groove 238 refers to its dimension along the length direction of the connector 23.

[0143] The number of the second groove 238 is not limited to four; for example, it can be one to four or more. Optionally, the number of the second groove 238 can be adjusted by changing the number and position of the guide ribs.

[0144] The wire 20 passes through the connector 23 to enter the functional compartment 4, as in some embodiments, such as Figure 15 , Figure 16 and Figure 22 As shown, the connector 23 is provided with a receiving groove 239 extending along its length and passing through both ends of the connector 23. The receiving groove 239 opens from the outer peripheral surface of the connector 23, that is, the receiving groove 239 communicates with the outer peripheral surface of the connector 23. The receiving groove 239 is used to accommodate the wire 20 so that the wire 20 can pass through the outer skin layer 22 into the functional compartment 4. At the same time, the receiving groove 239 can limit the wire 20 to ensure the positional accuracy of the connector 23 and the wire 20 when the outer skin layer 22 is molded. Optionally, the outer sheath 22 also includes a covering portion 220 extending into the receiving groove 239 and covering part of the wire 20. The covering portion 220 seals the opening of the receiving groove 239 exposed on the outer peripheral surface of the connector 23, which can press down the wire 20 and increase the overall sealing effect, thereby making the waterproof performance of the earphone better. At the same time, the covering portion 220 embedded in the connector 23 increases the contact area with the connector 23, making the connection strength between the connector 23 and the outer sheath 22 better, and reducing the risk of the outer sheath 22 peeling off or falling off from the connector 23. Optionally, the covering portion 220 is flush with the outer peripheral surface of the connector 23. Specifically, the surface 220a of the covering portion 220 exposed on the connector 23 is flush with the outer peripheral surface of the connector 23 where the receiving groove 239 is located (the second surface 23c in the figure). This simplifies the mold and ensures that the parting surfaces of the connector 23 and the outer skin layer 22 mold are on the same plane. This greatly reduces the possibility of excess material in the outer skin layer 22, resulting in a better seal between the outer skin layer 22 and the connector 23, preventing water infiltration, and thus improving the waterproof performance of the headphones. Further, optionally, the end face 220b of the covering portion 220 exposed on the connector 23 is flush with or recessed into the end face 23d of the outer end of the connector 23, so that the covering portion 220 does not affect the fit with the connector hole 405.

[0145] The receiving groove 239 can open from the first surface 23b, the second surface 23c, or the side surface 23a of the connector 23. Since the areas of the first surface 23b and the second surface 23c of the connector 23 are relatively larger, the receiving groove 239 can optionally open from either the first surface 23b or the second surface 23c of the connector 23. Furthermore, when the first surface 23b is provided with a boss 231 or a ridge 236, it can optionally be exposed from the second surface 23c, so that the boss 231 and the ridge 236 have appropriate dimensions to ensure the respective functions of the boss 231 and the ridge 236.

[0146] The depth H2 of the receiving groove 239 is greater than the diameter of the wire 20. Optionally, in a cross-section perpendicular to the length direction of the connector 23, the covering portion 220 covers a portion of the surface of the wire 20; that is, the covering portion 220 partially surrounds the wire 20 rather than fully surrounding it. This can save space in the thickness direction of the connector 23 while ensuring a sealing effect, thus facilitating miniaturization. Further optionally, in a cross-section perpendicular to the length direction of the connector 23, the covering portion 220 covers more than 50% of the outer contour of the cross-section of the wire 20 to ensure a sealing effect. It is understood that in other embodiments, the covering portion 220 may also fully surround the outside of the wire 20 to further enhance waterproof performance.

[0147] It is understandable that when connector 23 is made of metal, it can typically have a smaller volume compared to traditional plastic materials. In some embodiments, connector 23 is made of metal and its volume ranges from 20 to 80 mm³. The volume of connector 23 can be calculated by multiplying its length L6 (the maximum distance between the two end faces along the length direction of connector 23), width W3 (the maximum distance between the two side surfaces along the width direction of connector 23), and thickness H1 (the maximum distance between the first surface 23b and the second surface 23c along the thickness direction of connector 23). Protruding features such as bosses 231 and protrusions 236 typically have a very small overall volume and have little impact on the overall volume of connector 23, nor do they affect the specific structural design of connector 23. Therefore, they are not included in the volume calculation. If the connector 23 is too large, its weight will increase, and the outer skin layer 22 covering the connector 23 will become thinner, making the connector 23 prone to being exposed. If the connector 23 is too small, its overall strength will be insufficient, making it prone to breakage. Setting the volume of the connector 23 in the range of 20~80mm³ is beneficial to ensuring the covering effect of the outer skin layer 22 and the structural strength of the connector 23. Further optionally, the volume of the connector 23 is 30~70mm³, and even more optionally, 40~50mm³, to further ensure the effect.

[0148] In some embodiments, connector 23 is made of metal and its weight ranges from 1.5 to 5g. Excessive weight increases the overall weight of the headphones, affecting wearing comfort; insufficient weight weakens the overall strength of connector 23, hindering reliable connection. Setting the weight range to 1.5 to 5g ensures that connector 23 has a suitable weight, guaranteeing reliable connection. Further optionally, connector 23 weighs 2 to 4g, and even more preferably 2.5 to 3.5g, to further ensure optimal performance.

[0149] In some embodiments, the mass ratio of connector 23 (referring to a single connector 23) to the rear hook 2 is 0.2 to 0.4. If the ratio is too large, the connector 23 will be too heavy, increasing the overall weight of the headphones and affecting wearing comfort; if the ratio is too small, the connector 23 will be too light, resulting in lower overall strength and compromising connection reliability. By setting the mass ratio of connector 23 to rear hook 2 to 0.2 to 0.4, the center of gravity of rear hook 2 is positioned more appropriately, improving wearing comfort while ensuring the strength of connector 23. Further optionally, the mass ratio of connector 23 to rear hook 2 is 0.25 to 0.35, and even more preferably 0.27 to 0.33, to further ensure optimal performance.

[0150] The elastic metal wire 21 is connected to the connector 23, passing through the interior of the connector 23 and fixed thereto. For example, a connecting hole 234 extending along the length direction of the connector 23 can be provided on the connector 23, and the elastic metal wire 21 passes through the connecting hole 234. In some embodiments, the ratio of the projected area of ​​the elastic metal wire 21 and the connector 23 on the same plane perpendicular to the length direction of the connector 23 along the length direction of the connector 23 is 5% to 20%. When the ratio is too large, the elastic metal wire 21 is too thick, the clamping force is large, the wearing experience is more painful, and the thickness of the connector 23 covering the outside of the elastic metal wire 21 is thin, making it easy to break. When the ratio is too small, the elastic metal wire 21 is too thin, making it easy to break, and the wearing clamping force is insufficient, making it easy to fall off. Further optionally, the ratio of the projected area of ​​the elastic metal wire 21 and the connector 23 on the same plane perpendicular to the length direction of the connector 23 is 7% to 13%, and even more preferably 9% to 12%, so that the thickness of the elastic metal wire 21 is more suitable, ensuring that the clamping force is at an appropriate level, and making the connection between the connector 23 and the elastic metal wire 21 more reliable.

[0151] In some embodiments, the end of the elastic wire 21 does not protrude beyond the end face 23d of the outer end of the connector 23. In other embodiments, such as Figure 23 and Figure 24As shown, the end of the elastic metal wire 21 protrudes from the end face 23d of the connector 23. During the manufacturing process, the exposed part of the elastic metal wire 21 can be embedded in the mold to form a precise positioning, thereby facilitating the positioning of the elastic metal wire 21 during mold forming and improving dimensional accuracy. Optionally, the length L7 of the end face 23d of the elastic metal wire 21 protruding from the connector 23 is 0.5~2mm. When the length L7 is too long, during the manufacturing process, due to the twisting of the elastic metal wire 21 itself, the straightness is poor, making it difficult to put into the mold positioning groove, which is not conducive to mold positioning. When the length L7 is too short, the contact area between the elastic metal wire 21 and the positioning groove of the mold is small, making it easy to pop out, which is also not conducive to mold positioning. Further optionally, the length L7 is 0.6~1.2mm, and even more optionally, 0.7~0.9mm, so that the elastic metal wire 21 can play a good mold positioning role.

[0152] In some embodiments, the connector 23 can be formed independently, and the elastic metal wire 21 is fixed to the connector 23 by riveting. In other embodiments, the elastic metal wire 21 is embedded during the forming of the connector 23, and the connector 23 is directly formed onto the elastic metal wire 21 by a submerged injection molding process. For example, when the connector 23 is made of metal, the submerged injection molding process can be die casting; when the connector 23 is made of plastic, the submerged injection molding process can be injection molding.

[0153] After the connector 23 and the elastic metal wire 21 are connected and formed, the wire 20 is threaded through the connector 23. In some embodiments, the receiving groove 239 extends through both ends of the connector 23 along its length, making it more convenient to thread the wire 20. In other embodiments, refer to... Figure 25 The connector 23 also includes a wire-passing hole 23e communicating with the receiving groove 239. The cross-section of the wire-passing hole 23e is a closed hole, for example, a circle adapted to fit the wire 20. Compared to the connector 23 having wire-passing holes 23e connecting both ends of its length to pass the wire 20, in the structure combining the receiving groove 239 and the wire-passing hole 23e, the length of the wire-passing hole 23e is relatively shorter, making it easier for the wire 20 to pass through the connector 23. The size of the receiving groove 239 can be made larger than the cross-sectional size of the hole segment through which the wire passes, thereby further facilitating the passing of the wire 20. Optionally, the wire-passing hole 23e and the receiving groove 239 are coaxially arranged (including nearly coaxially).

[0154] The cross-sectional shape of the portion of the elastic metal wire 21 located within the connector 23 can be circular or flat. Flat shapes include, but are not limited to, rectangles or ellipses. The shape design can be determined based on the bonding force between the connector 23 and the elastic metal wire 21. When the bonding force is sufficient, the portion of the elastic metal wire 21 located within the connector 23 can have a circular cross-section, resulting in better strength, requiring no additional processing, and relatively low cost. When the bonding force is insufficient, to improve the connection strength between the elastic metal wire 21 and the connector 23, at least a portion of the cross-section of the portion of the elastic metal wire 21 located within the connector 23 can be set to flat to increase the bonding strength.

[0155] It should be noted that, in the absence of conflict, the various embodiments described herein can be combined with each other to obtain more implementation schemes.

[0156] The above are merely specific embodiments of this utility model. Any improvements made based on the concept of this utility model shall be considered within the scope of protection of this utility model.

Claims

1. A head-mounted sound-generating device, characterized in that, include: Functional compartment (4), including outer shell (40); and, The rear hanger (2) includes an outer skin layer (22) and a connector (23) connected to the end (22a) of the outer skin layer (22). The connector (23) is inserted into the outer shell (40) and is not connected to the outer peripheral surface of the outer skin layer (22). The end (22a) of the outer skin layer (22) includes a first outer end face (2d) and at least one second outer end face (240). The first outer end face (2d) and the second outer end face (240) are not coplanar, and both the first outer end face (2d) and at least one second outer end face (240) are in contact with the outer shell (40).

2. The head-mounted sound-generating device as described in claim 1, characterized in that, The housing (40) includes a connector (405), the connector (23) is mated with the connector (405) and is centered relative to the end (22a).

3. The head-mounted sound-generating device as described in claim 1, characterized in that, The first outer end face (2d) and all of the second outer end faces (240) are in contact with the outer shell (40).

4. The head-mounted sound-generating device as described in claim 1, characterized in that, The outer casing (40) includes a first contact surface (400) that is fitted to the first outer end face (2d) and a second contact surface (401) that is fitted to the second outer end face (240).

5. The head-mounted sound-generating device as described in claim 1, characterized in that, The end (22a) of the outer skin layer (22) is provided with a connecting surface (241) connecting the first outer end face (2d) and the second outer end face (240), wherein the first outer end face (2d), the second outer end face (240) and the connecting surface (241) are planar or curved surfaces.

6. The head-mounted sound-generating device as described in claim 5, characterized in that, The connector (23) has a first surface (23b) parallel to the connecting surface (241), and both the connecting surface (241) and the first surface (23b) are planar.

7. The head-mounted sound-generating device as described in claim 5, characterized in that, The outer casing (40) includes a third contact surface (402) that fits against the connecting surface (241).

8. The head-mounted sound-generating device as described in claim 5, characterized in that, The outer skin layer (22) has at least one groove (24) at its end to form the second outer end face (240) and a connecting surface (241) connecting the first outer end face (2d) and the second outer end face (240).

9. The head-mounted sound-generating device as described in claim 1, characterized in that, The end (22a) of the outer skin layer (22) includes a first outer end face (2d) and a second outer end face (240).

10. The head-mounted sound-generating device as described in claim 1, characterized in that, The end (22a) of the outer skin layer (22) includes two second outer end surfaces (240) located on the same side of the first outer end surface (2d), and the two second outer end surfaces (240) are arranged along the length or width direction of the end (22a) of the outer skin layer (22).

11. The head-mounted sound-generating device as described in claim 1, characterized in that, When the end (22a) includes two or more second outer end faces (240), all the faces of the first outer end face (2d) and all the second outer end faces (240) are arranged in parallel, or at least two faces are not parallel, or all the faces are not parallel to each other.

12. The head-mounted sound-generating device as described in claim 1, characterized in that, The offset distance D3 between the adjacent ends of the first outer end face (2d) and the second outer end face (240) is 1~3mm.

13. The head-mounted sound-generating device as described in claim 12, characterized in that, The offset distance D3 is 1.5~2.5mm.

14. The head-mounted sound-generating device as described in claim 13, characterized in that, The offset distance D3 is 1.7~2mm.

15. The head-mounted sound-generating device as described in claim 1, characterized in that, The first outer end face (2d) and the second outer end face (240) are arranged in parallel; or, there is an included angle that is not zero.

16. The head-mounted sound-generating device as described in claim 1, characterized in that, The included angle α3 between the first outer end face (2d) and the second outer end face (240) is 10 º to 60 º.

17. The head-mounted sound-generating device as described in claim 16, characterized in that, The included angle α3 is 30°~55°.

18. The head-mounted sound-generating device as described in claim 17, characterized in that, The included angle α3 is 40°~50°.

19. The head-mounted sound-generating device according to any one of claims 1 to 18, characterized in that, The connector (23) is provided with a protruding boss (231), the boss (231) is at least partially exposed on the outer skin layer (22), and the outer shell (40) is provided with a positioning groove (4020) that mates with the boss (231).

20. The head-mounted sound-generating device according to any one of claims 1 to 18, characterized in that, The width of the connector (23) is greater than its thickness, and the width direction of the connector (23) is consistent with the thickness direction Y3 of the outer shell (40).

21. The head-mounted sound-generating device according to any one of claims 1 to 18, characterized in that, The head-mounted sound device includes a locking element (5) that is at least partially inserted into the housing (40) and the connector (23), the connector (23) being made of metal.

22. The head-mounted sound-generating device as described in claim 21, characterized in that, The weight range of the connector (23) is 1.5~5g.

23. The head-mounted sound-generating device as described in claim 22, characterized in that, The weight range of the connector (23) is 2~4g.

24. The head-mounted sound-generating device as described in claim 23, characterized in that, The weight range of the connector (23) is 2.5~3.5g.

25. The head-mounted sound-generating device as described in claim 21, characterized in that, The volume of the connector (23) ranges from 20 to 80 mm³.

26. The head-mounted sound-generating device as described in claim 25, characterized in that, The volume of the connector (23) ranges from 30 to 70 mm³.

27. The head-mounted sound-generating device as described in claim 26, characterized in that, The volume of the connector (23) ranges from 40 to 50 mm³.

28. The head-mounted sound-generating device according to any one of claims 1 to 18, characterized in that, The mass ratio of a single connector (23) to the mass of the rear hanger (2) is 0.2 to 0.

4.

29. The head-mounted sound-generating device as described in claim 28, characterized in that, The mass ratio of a single connector (23) to the mass of the rear hanger (2) is 0.25 to 0.

35.

30. The head-mounted sound-generating device as described in claim 29, characterized in that, The mass ratio of a single connector (23) to the mass of the rear hanger (2) is 0.27 to 0.

33.

31. The head-mounted sound-generating device according to any one of claims 1 to 18, characterized in that, It includes two functional compartments (4) for accommodating a control circuit board and / or a battery, and the rear mount (2) is connected between the two functional compartments (4); The head-mounted sound device also includes two sound-generating units (10) and ear hooks (3), and the sound-generating units (10) and the functional compartment (4) are connected by the ear hooks (3).

32. The head-mounted sound-generating device as described in claim 31, characterized in that, The headband-mounted sound device is a bone conduction headphone. When the headband-mounted sound device is opened to a distance D1 between the two ends of the outer skin layer (22) of 140mm, the contact force of the sound unit (10) on the facial skin is 0.22~1.33N.

33. The head-mounted sound-generating device as described in claim 32, characterized in that, When the head-mounted sound device is opened to a distance D1 between the two ends of the outer skin layer (22) of 140mm, the contact force of the sound unit (10) on the facial skin is 0.4~0.8N.

34. The head-mounted sound-generating device as described in claim 33, characterized in that, When the head-mounted sound device is opened to a distance D1 between the two ends of the outer skin layer (22) of 140mm, the contact force of the sound unit (10) on the facial skin is 0.5~0.7N.

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