Rear-hanging and head-mounted sound production equipment

Abstract

The utility model discloses a rear hanger and head-mounted sounding equipment, and relates to the technical field of sounding devices, and the rear hanger comprises a lead, an outer skin layer and a connector. The outer skin layer is coated outside the wire; the connector is arranged at the end part of the outer skin layer; the wire is arranged in the connector in a penetrating mode, the connector is provided with a containing groove which extends in the length direction of the connector and is provided with an opening from the peripheral face of the connector, and the wire is arranged in the containing groove. And the outer skin layer comprises a coating part which is arranged in the accommodating groove and seals an opening of the accommodating groove exposed from the outer peripheral surface of the connector. The wrapping part can press the wire, the overall sealing effect is improved, the waterproof performance of the earphone is more excellent, meanwhile, the wrapping part embedded into the connector increases the contact area with the connector, the connection strength of the connector and the outer skin layer is better, and the risk that the outer skin layer is stripped from or falls off from the connector can be reduced.

Description

[0001] 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 a kind of rear hanging and head-mounted sound production equipment. BACKGROUND

[0003] Head-mounted sound production equipment, such as earphone, all include sound production device that can sound, according to the different ways of sound transmission, sound production device can be divided into bone conduction sound production device and air conduction sound production device, earphone containing bone conduction sound production device is usually called bone conduction earphone.

[0004] A known earphone structure includes two earphone heads, two function compartments, a rear hanging connected between the two function compartments, and an ear hanging connected between the function compartment and the earphone head. The number of ear hangings is two. When the earphone is worn, the ear hangings are hooked around the ears of the human body, and the rear hanging is wrapped around the back of the head. The function compartment can contain a control circuit board and / or a battery. Usually, one function compartment mainly installs a control circuit board (commonly known as a control compartment), and the other function compartment mainly accommodates a battery (commonly known 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 more 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 bending the rear hanging), a bending point can easily occur, causing the rear hanging to not reliably return to its original state and permanently deforming, affecting the normal use of the earphone. Further, the outer skin layer of some earphone rear hangings 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 hangings 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 swimming or rainy weather), the waterproof performance of the earphones is required to be high. The rear hanging and the function compartment of some earphones are connected 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 earphone.

[0010] As shown in Figure 26 and Figure 27 , Figure 26 and Figure 27 show the structure of the earphone's back hanging and the function warehouse, the back hanging 90 includes a connector 91, which is connected with the shell 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 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 it will not be strong enough after being combined with the matched function warehouse 92, and it will easily shake or break with a little force. Moreover, the tail of the connector 91 needs to have a hook 93 to be clamped on the function warehouse, so that part of the function warehouse 92 will inevitably occupy a certain space, causing the related plastic parts to be unable to be made small, and the function warehouse to be too large in size. 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 complexity of the structure of the function warehouse 92. When the function of the earphone gradually increases, it will inevitably increase certain devices, 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. The connector 91 is generally made of PA66, which has high strength but strong hygroscopicity. After being in contact with water, the overall volume will increase and maintain for a long time. At this time, the expanded part of the connector 91 will expand the part of the plastic shell that matches it, causing a large internal stress in the plastic shell that cannot be released. After a period of time, cracks will appear in the shell or local parts will fall off, causing functional failure, seriously affecting product quality and user experience, and making maintenance difficult after failure, which will also increase after-sales costs.

[0013] Third, the contact surface 94 between the back 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 back hanging 90, the glue will overflow due to the small area, causing appearance defects.

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

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

[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 rear hanging and 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, on one hand, the utility model provides a rear hanging, comprising:

[0019] Wire;

[0020] Skin layer, is covered in the wire outside;And,

[0021] Plug-in, is located in the end of skin layer;

[0022] The wire is arranged in the plug-in, the plug-in is provided with the accommodation groove extending along its length direction and opening from the outer peripheral surface of the plug-in, the wire is arranged in the accommodation groove, and the skin layer includes the covering part arranged in the accommodation groove and sealing the opening of the accommodation groove exposed from the outer peripheral surface of the plug-in.

[0023] On the other hand, the utility model provides a head-mounted sound production equipment, comprising:

[0024] The rear hanging as described above;

[0025] Two sound production units;

[0026] Two function warehouses, the function warehouse is used to accommodate control circuit board and / or battery, the rear hanging is connected between two function warehouses, and is plugged with the function warehouse through the plug-in;And,

[0027] Ear hook, the sound production unit and the function warehouse are connected through the ear hook.

[0028] Compared with the prior art, the utility model has the beneficial effects that according to at least one embodiment of the utility model, the plug-in is provided with the accommodation groove extending along its length direction and opening from the outer peripheral surface of the plug-in, the wire is arranged in the accommodation groove, and the skin layer includes the covering part arranged in the accommodation groove and sealing the opening of the accommodation groove exposed from the outer peripheral surface of the plug-in. The covering part can press the wire, increase the sealing effect of the whole, so that the waterproof performance of the earphone is more superior, simultaneously, the covering part embedded in the plug-in increases the contact area with the plug-in, so that the connection strength of the plug-in and the skin layer is better, and the risk that the skin layer is peeled or falls off from the plug-in can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the three-dimensional schematic diagram of head-mounted sound production equipment according to some embodiments of the specification.

[0030] Figure 2 This is a schematic diagram of the sound-generating unit of a head-mounted sound-generating device according to some embodiments of this specification.

[0031] Figure 3a This is a perspective view of a rear-mounted device according to some embodiments of this specification.

[0032] Figure 3b yes Figure 3a The exploded view of the rear hanger is shown.

[0033] Figure 4a yes Figure 1 A top view of the head-mounted sound device shown.

[0034] Figure 4b yes Figure 1 The side view of the head-mounted sound device shown.

[0035] Figure 5 yes Figure 3a The rear-mounted main view is shown.

[0036] Figure 6 It is along Figure 5 A cross-sectional view obtained by cutting along section AA.

[0037] Figure 7 This is a schematic diagram of the outer skin layer according to some embodiments of this specification, in which the outer skin layer is truncated in the middle.

[0038] Figure 8 yes Figure 7 A schematic diagram of the end of the outer skin layer is shown.

[0039] Figure 9 yes Figure 1 A 3D diagram showing the connection between the central functional compartment and the rear hanging part.

[0040] Figure 10 This is a perspective view of a functional compartment according to some embodiments of this specification.

[0041] Figure 11a This is a three-dimensional schematic diagram of the end of the outer skin layer according to some embodiments of this specification.

[0042] Figure 11b yes Figure 11a The side view of the end of the external force layer is shown.

[0043] Figure 12 This is a schematic diagram of the connection between the functional compartment and the rear mount according to some embodiments of this specification.

[0044] Figure 13a This is a schematic diagram of the end of the outer skin layer according to some embodiments of this specification.

[0045] Figure 13b is a schematic view of the end of the outer skin layer according to some embodiments of the present specification.

[0046] Figure 14 is a schematic view of the end of the rear hanging according to some embodiments of the present specification.

[0047] Figure 15 is a schematic view of the end of the rear hanging according to some embodiments of the present specification. Figure 3a is an enlarged view of the I part in the middle.

[0048] Figure 16 is a schematic view of the connection of the connector and the blocking piece according to some embodiments of the present specification, wherein the number of the blocking pieces is one.

[0049] Figure 17 is a schematic view of the position of the blocking piece and the shell according to some embodiments of the present specification, wherein the number of the blocking pieces is one.

[0050] Figure 18 is a schematic view of the connection of the blocking piece and the shell, the connector according to some embodiments of the present specification, wherein the number of the blocking pieces is one.

[0051] Figure 19 is a schematic view of the connection of the connector and the blocking piece according to some embodiments of the present specification, wherein the number of the blocking pieces is two.

[0052] Figure 20 is a schematic view of the connection of the blocking piece and the shell, the connector according to some embodiments of the present specification, wherein the number of the blocking pieces is two.

[0053] Figure 21 is a top view of the connector according to some embodiments of the present specification.

[0054] Figure 22 is a schematic view of the end of the rear hanging according to some embodiments of the present specification.

[0055] Figure 23 is a schematic view of the end of the rear hanging according to some embodiments of the present specification, wherein the elastic wire passes through the connector.

[0056] Figure 24 is a schematic view of the end of the rear hanging according to some embodiments of the present specification. Figure 23 is a side view of the structure shown.

[0057] Figure 25 is a sectional view of the connector according to some embodiments of the present specification.

[0058] Figure 26 is a schematic view of the connection of the rear hanging and the functional compartment hook according to some embodiments of the present specification.

[0059] Figure 27 is a schematic view of the connection of the rear hanging and the functional compartment hook according to some embodiments of the present specification. DETAILED DESCRIPTION

[0060] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings, rather than all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0061] The terms "comprising" and "having" and any variations thereof in the present application are intended to cover the inclusions without limitation. For example, a process, method, system, product or apparatus including a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or apparatus.

[0062] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that the phrase in the specification in various places does not necessarily all refer to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with each other.

[0063] As shown in Figure 1 The embodiments of the present specification describe a head-mounted sound emitting device which can be worn on the head of a human body and enable the human body to hear sound, for example, through bone conduction and / or air conduction. The head-mounted sound emitting device includes a sound emitting unit 10 for emitting sound and a wearing mechanism 11 connected to the sound emitting unit 10, the wearing mechanism 11 being used to wear the sound emitting unit 10 on the head of the human body so that the sound can be conveniently heard by the human body. Exemplarily, the sound emitting unit 10 is worn at a position corresponding to the ear of the human body.

[0064] Figure 1The head-mounted sound production device shown in the figure is a binaural earphone, which includes two sound production units 10 (or earphone heads), a back hanging 2 adapted to be hung around the back of the head, two ear hangings 3 adapted to be hung on the ears, and two function compartments 4 for accommodating control circuit boards and / or batteries. For example, the two function compartments 4 are a control compartment for accommodating a control circuit board and a battery compartment for accommodating a battery, respectively. For another example, each function compartment 4 accommodates a control circuit board and / or a battery. The back hanging 2 is connected between the two function compartments 4, and the two sound production units 10 are correspondingly arranged with the two function compartments 4, and the sound production unit 10 and the corresponding function compartment 4 are connected through the ear hanging 3. Taking the two function compartments 4 as the control compartment and the battery compartment as an example, the back hanging 2 is connected between the control compartment and the battery compartment, and the control compartment and one of the sound production units 10 are connected through an ear hanging 3, and the battery compartment and the other sound production unit 10 are connected through an ear hanging 3. The head-mounted sound production device is symmetrical as a whole to improve the comfort of wearing.

[0065] Optionally, the head-mounted sound production device is a bone conduction earphone, which is provided with a bone conduction sound production device 100 capable of producing vibration in the sound production unit 10. When the bone conduction earphone is used, the sound production unit 10 is located in front of the ear and is in close contact with the skin of the face. The mechanical vibration is transmitted to the skin and further transmitted to the auditory system of the human body, so that the human being can hear the sound. Further optionally, the sound production unit 10 of the head-mounted sound production device further includes an air conduction sound production device 101 capable of producing air conduction sound through diaphragm vibration. The sound production unit 10 is provided with a sound outlet hole 1021 for air conduction sound.

[0066] Figure 2In the illustrated embodiment, the sound generating unit 10 includes a housing assembly 102, a bone conduction sound generating device 100 and an air conduction sound generating device 101, which are all arranged in the housing assembly 102. The housing assembly 102 has a proximal end 1020 close to the human ear when the head-mounted sound generating device is worn. The air conduction sound generating device 101 is arranged close to the proximal end 1020 relative to the bone conduction sound generating device 100 and is arranged to generate sound towards the proximal end 1020. The proximal end 1020 is provided with a sound outlet hole 1021. In this way, the air conduction sound generating device 101 can be close to the human ear and generate sound towards the ear, which helps to improve the directness and clarity of the sound, reduces the loss and distortion of the sound, enables the human to hear more air conduction sound, has higher sound generating efficiency, and has better effect. Moreover, the volume of the air conduction sound generating device 101 can be appropriately reduced, which is beneficial to miniaturization. In addition, the bone conduction sound generating device 100 is far away from the sound outlet hole 1021, which can reduce the interference caused by the sound wave inside the bone conduction sound generating device 100 when the bone conduction sound generating device 100 vibrates. It can be understood that the proximal end 1020 is also the end of the housing assembly 102 close to the functional bin 4, and the sound outlet hole 1021 is arranged on the end surface of the housing assembly 102 facing the functional bin 4. It can be understood that although the present specification takes the earphone as an example for introduction, the head-mounted sound generating device is not limited to the earphone, for example, it can also be a hearing aid, audio glasses, VR device, AR device, or other electronic device.

[0067] In some embodiments, as shown in Figure 3a and Figure 3b , the back hanging 2 includes a wire 20, an elastic wire 21, and an outer skin layer 22 covering the wire 20 and the elastic wire 21. The two ends of the back hanging 2 are connected to the two functional bins 4 respectively. The wire 20 extends into the functional bin 4 and is electrically connected to the electronic components in the functional bin 4. The elastic wire 21 can keep the back hanging 2 in a specific shape and provide a clamping force (or contact force, extrusion force, etc.) to drive the sound generating unit 10 to keep close to the skin of the face during use. In some embodiments, the back hanging 2 further includes two connectors 23 arranged at the two ends of the outer skin layer 22, which are used to plug and fix with the functional bin 4.

[0068] It should be noted that the structure diagrams shown in the drawings of the present application are all in the natural state of the head-mounted sound generating device when it is not worn.

[0069] In some embodiments, as shown in Figure 4a , Figure 4a , a top view of the head-mounted sound generating device is shown. In the figure, the head-mounted sound generating device is in a natural state, and the whole is symmetrical about the symmetry plane 2a. The outer skin layer 22 of the back hanging 2 includes a first curved portion 2b and two second curved portions 2c respectively located at the two ends of the first curved portion 2b, Figure 4aIn the embodiment shown in the figure, 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 in the shape of a circular arc, which is symmetrical about the symmetry plane 2a, and the second curved portion 2c extends away from the first curved portion 2b and is in the shape of a curved line (which can be an arc or other curved shape) that curves toward the side on which the symmetry plane 2a is located. The two second curved portions 2c are symmetrical about the symmetry plane 2a. Optionally, the second curved portion 2c is in the shape of a curved line, for example, in the shape of a curved line with varying curvature. The curvature of the circular arc is uniform, and when the user wears the earphone, the force on each point in the first curved portion 2b of the back-hanging 2 is uniform, and the clamping force on the left and right ears is more uniform and consistent. The back-hanging 2 is less likely to have a folding point (a fixed stress point) due to a large change in curvature. The folding point can cause the back-hanging 2 to twist up and down, resulting in uneven stress on the left and right sides, causing discomfort when wearing, and in severe cases, the back-hanging 2 can break due to long-term uneven stress.

[0070] In the embodiment described in the specification, the plane in which the center line of the portion of the elastic metal wire 21 corresponding to the first curved portion 2b is located is the reference plane B, the top-down direction is perpendicular to the reference plane B, and the head-mounted sound production device is observed in a top-down manner. 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 symmetry plane 2a and a length direction parallel to the symmetry plane 2a. The back-hanging 2 has two left end points O4 and right end points O5 located at the outermost sides in the width direction of the earphone and a rear end point O6 located at the outermost side in the rear direction of the length direction. The plane formed by the left end point O4, the right end point O5, and the rear end point O6 is parallel (or approximately parallel) to the reference plane B and has a close distance (even coincides) to the reference plane B, which can be approximated as the reference plane B.

[0071] The first curved portion 2b in the shape of a circular arc can be understood as having a center line in the shape of a circular arc. The center line of the first curved portion 2b can be approximated as the middle line of the inner and outer contours of the first curved portion 2b in the top-down direction, which is equidistant from the inner and outer contours (for example, a plurality of positions can be taken on the inner and outer contours of the first curved portion 2b, and the connecting line of the width direction midpoint of each position can form the middle line). Similarly, the second curved portion 2c in the shape of a curved line can be understood as having a center line in the shape of a curved line. The center line of the second curved portion 2c can be approximated as the middle line of the inner and outer contours of the second curved portion 2c in the top-down direction, and the center O3 is the center of the circle in which the center line is located. Figure 4a The middle line 2g and the middle line 2h shown in the figure are the middle lines of the first curved portion 2b and the second curved portion 2c, respectively.

[0072] In some embodiments, the diameter of the first curved portion 2b ranges from 80 mm to 120 mm, the diameter of the first curved portion 2b 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 will be small, and the earphone will be easy to fall off. If the diameter is too small, the clamping force will be too tight, and the earphone will be easy to cause pain. Further, the diameter of the first curved portion 2b ranges from 90 mm to 110 mm, and more preferably ranges from 95 mm to 105 mm, for example, 95 mm, 100 mm or 105 mm. In this way, the ear hook 2 has a more appropriate clamping force, and the wearing is more comfortable. When the earphone is worn during exercise, the wearing can also be stable, and the earphone is not easy to loosen or fall off.

[0073] In some embodiments, the central angle a1 of the first curved portion 2b ranges from 100° to 180°, the central angle a1 is the angle between the two lines 2e connecting the center O3 of the first curved portion 2b and the two ends of the first curved portion 2b, for example, the two lines 2e can be formed by connecting the center O3 and the two ends of the middle line of the first curved portion 2b, and the lines 2e can also be the boundary lines of the first curved portion 2b and the second curved portion 2c. If the angle is too large, the overall clamping force of the earphone will be too tight, and the earphone will be easy to cause pain. If the angle is too small, the overall clamping force of the earphone will be small, and due to the uneven curvature of the ear hook 2, a fixed stress point will be easy to occur, and the ear hook will be easy to break. Further, the central angle a1 of the first curved portion 2b ranges from 110° to 150°, and more preferably ranges from 115° to 125°, for example, 115°, 120° or 125°. In this way, the ear hook 2 has a more appropriate clamping force, and the wearing is more comfortable.

[0074] Continuing to refer to Figure 4a In the top view, the ear hook 2 has a reference surface 2f, the reference surface 2f is a surface passing through the center O3 of the first curved portion 2b and perpendicular to the symmetry surface 2a and the reference surface B. When the central angle a1 is less than 180°, the two ends of each second curved portion 2c are located on the two sides of the reference surface 2f, respectively, and the distance D6 between the portions of the two second curved portions 2c located at the reference surface 2f along the width direction of the headphone is greater than the interval D1 and D7 between the end portions along the width direction of the headphone. Here, the distance refers to the distance between the inner contours of the corresponding portions. In this way, the width of the ear hook 2 gradually increases towards the reference surface 2f, and then gradually decreases after passing through the reference surface 2f. The ear hook 2 can better adapt to the head shape, provide clamping force, and make the wearing more comfortable.

[0075] 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 backhang 2 is 0.4-0.6, the length of the first curved portion 2b and the length of the outer skin layer 22 both refer to the length of the center line, which can be approximated as half of the sum of the length of the inner contour and the length of the outer contour of the first curved portion 2b (or the outer skin layer 22) in the top view. The length of the outer skin layer 22 does not include the cladding portion 220 described below. It can be understood that the clamping force is related to the length ratio of the first curved portion 2b and the outer skin layer 22, the larger the ratio, the greater the clamping force, at the same time, the larger the proportion of the first curved portion 2b, the more uniform the stress of the backhang 2, and the less likely to produce a folding point. By setting the ratio of the length of the first curved portion 2b to the length of the outer skin layer 22 of the backhang 2 to 0.4-0.6, it is beneficial to further ensure the anti-breaking performance of the backhang 2 while ensuring appropriate clamping force. Further optionally, the ratio of the length of the first curved portion 2b to the length of the outer skin layer 22 of the backhang 2 is 0.45-0.55, and more further optionally 0.47-0.53, to further ensure the effect.

[0076] In some embodiments, when the earphone is in a natural state, the outer skin layer 22 has a spacing distance D1 between the two ends, the spacing distance D1 refers to the shortest distance between the two ends of the outer skin layer 22, and the spacing distance D1 is related to the clamping force when the earphone is worn. Optionally, the ratio of the spacing distance D1 to the diameter of the first curved portion 2b is 0.5-1.2, and the setting of the clamping force size needs to take into account the comfort and stability of wearing, and the ratio of the spacing distance D1 to the diameter of the first curved portion 2b can be used to adjust the specific clamping force size. When the diameter of the first curved portion 2b is constant, the larger the ratio, the greater the distance between the two functional compartments 4, but when the ratio is too large, it is easy to cause the wearing to be loose and the stability to be poor, and it is easy to fall off. The smaller the ratio, the smaller the distance between the two functional compartments 4, the tighter the wearing, and the better the stability, but when the ratio is too small, it is easy to cause the wearing to be painful. By setting the ratio of the spacing distance D1 to the diameter of the first curved portion 2b to 0.5-1.2, the ratio range can be more appropriate, and the wearing stability and comfort are better. Further optionally, the ratio of the spacing distance D1 to the diameter of the first curved portion 2b is 0.6-0.9, and more further optionally, the ratio of the spacing distance D1 to the diameter of the first curved portion 2b is 0.7-0.8, to further ensure the effect.

[0077] Optionally, the two functional compartments 4 extend away from the first curved portion 2b and converge towards the symmetry plane 2a, as shown in Figure 4aAs shown, in the top view, the inner side of the functional pocket 4 has a contour line 4b, and the included angle a2 between the contour line 4b and the symmetry plane 2a is 15°-60°. When the contour line 4b is a curve, the included angle a2 can be the included angle between the tangent line of the most concave point or the most convex point of the contour line 4b and the symmetry plane 2a. If the included angle is too large, it is easy to cause tight wearing and easy to produce wearing pain; if the included angle is too small, it is easy to cause loose wearing and easy to fall off. The included angle a2 is set to 15°-60°, and the included angle is in a relatively appropriate interval, which is beneficial to obtain a suitable clamping force and ensure the firmness and comfort of wearing. Further optionally, the included angle a2 is 20°-40°, and more further optionally, the included angle a2 is 25°-30°, so as to further ensure the effect.

[0078] Optionally, the extension direction of the functional pocket 4 is consistent with the extension direction of the end of the rear hanging 2, and at the same time, is consistent with the extension direction of the connector 23, so as to facilitate installation and ensure clamping effect. The extension direction of the functional pocket 4 can be understood as the extension direction of the middle line 4a, and the middle line 4a is a line equidistant to the inner and outer contours of the functional pocket 4 in the top view (for example, a plurality of positions can be taken on the inner and outer contours of the functional pocket 4, and the connecting line of the width direction midpoint of each position can form the middle line).

[0079] The elasticity of the rear hanging 2 is mainly provided by the elastic metal wire 21, and therefore, the effective length of the rear hanging 2 can be regarded as the length of the elastic metal wire 21. Optionally, the effective length of the rear hanging 2 can be referred to as the length of the elastic metal wire 21. Figure 4b, the effective length of the rear hanging 2 (or the length of the elastic metal wire 21) ranges from 170 to 220 mm, the ear hanging 3 has a contact point O7 with the ear, the contact point O7 can be approximately the highest point of the inner contour in the side view (left view or right view) direction of the head-mounted sound production device, and the distance D9 between the rear end point O6 of the rear hanging 2 and the contact point O7 along the length direction of the earphone is 100-140 mm. The effective length value and the distance D9 are set considering the ergonomics of the wearer. When the earphone is worn, the rear hanging 2 needs to have a certain safety distance from the head. If the distance is too short, the head of some users may be in contact with the rear hanging 2 when wearing due to the stretching deformation, which makes it difficult to wear in place. If the distance is too long, the clamping force is too small when wearing, which is easy to relax and fall off, and the rear hanging 2 may be in contact with the seat or other obstacles during use, which lifts the earphone, and the rear hanging 2 is easy to twist and deform up and down when wearing. When moving, the tail of the rear hanging 2 will shake up and down, and the wearing stability will be poor. By setting the effective length of the rear hanging 2 to range from 170 to 220 mm and the distance D9 to range from 100 to 140 mm, the distance between the rear hanging 2 and the head can be more appropriate, and the comfort and firmness of wearing can be ensured. Further optionally, the effective length of the rear hanging 2 is 180-210 mm, and the distance D9 is 105-130 mm. More further optionally, the effective length of the rear hanging 2 is 195-205 mm, for example, it can be 195 mm, 200 mm or 205 mm, etc., and the distance D9 is 110-120 mm, for example, 110, 115 or 120 mm, etc., to further ensure the effect.

[0080] Considering the ergonomics of the space for accommodating the glasses legs, optionally, with reference to Figure 1 By setting the geometric shape of the ear hanging 3, the angle between the contact surface 10a of the earphone head and the inner side surface 4c of the functional compartment 4 is 150-170°. When the head-mounted sound production device is worn on the head of the human body, the contact surface 10a is deflected towards the face, so that the ear hanging 3 and the functional compartment 4 are outwardly deflected to a certain extent away from the side where the head is located after wearing, which is beneficial to form a certain gap between the ear hanging 3 and the skin of the head, which forms a space for placing the legs of the glasses, so that the legs of the glasses and the ear hanging 3 of the earphone (especially the bent part of the ear hanging 3) interfere less or do not interfere when the user wears the glasses, which is more convenient for wearing and using the glasses and the earphone at the same time, and enhances the stability of wearing the glasses. The angle between the contact surface 10a and the inner side surface 4c of the functional compartment 4 is further optionally 160-170°, and more further optionally 161-165°.

[0081] It can be understood that the rear hanging 2 can not only provide the source of most of the clamping force, but also can work together with the ear hanging 3, the functional warehouse 4 and the like to adjust the position of the sound generating unit 10. When the sound generating unit 10 includes the air guide sound generating device 101 and the sound outlet hole 1021, the position of the sound outlet hole 1021 can be adjusted. After the ear hanging 3 is set to a reasonable shape according to the above-mentioned clamping angle rule, and in cooperation with the structure, shape, size of the rear hanging 2, the setting angle of the functional warehouse and the like, the sound outlet hole 1021 of the earphone head can be made to be close to the appropriate position near the ear, so that the sound wave is transmitted to the eardrum through the shortest propagation path in the air, thereby improving the low-frequency sensitivity of the earphone, reducing distortion, and being beneficial to reducing or preventing contact with the tragus, and improving the comfort of wearing. It can be understood that the sound outlet hole 1021 needs to be configured at a suitable position away from the ear. If the distance is too far, the propagation path becomes longer, the low-frequency sensitivity decreases, and the distortion increases. Of course, it is not necessarily the closer to the ear canal, the better. The closer to the ear canal, the more the earphone head contacts the tragus part. The tragus is a protruding cartilage structure that is more sensitive to vibration and external contact. Although the sound outlet hole 1021 is close to the ear canal, it can increase the sensitivity, but the tragus will feel uncomfortable due to its sensitivity. Therefore, the sound outlet hole 1021 should be configured at a suitable position away from the ear canal.

[0082] In order to make the wearing more comfortable, the material of the outer skin layer 22 is generally selected from soft gel elastic materials, which have better touch when in contact with the skin. Common soft gel elastic materials include silicone, TPU (thermoplastic polyurethane elastomer), TPE (thermoplastic elastomer) and rubber, etc. In some embodiments, considering the extreme application scenarios (high and low temperature, high humidity, extreme bending and stretching, sweat salt fog pollution) of the rear hanging and the corresponding reliability test requirements, the material of the outer skin layer 22 can be selected as silicone, which has the characteristics of high and low temperature resistance, weather resistance and aging resistance, and can fully meet the user's needs and experience.

[0083] The hardness of the silicone material of the outer skin layer 22 also has certain influence on the comfort of wearing and the reliability of use. For example, when the hardness of the outer skin layer 22 is too hard, not only the touch is not comfortable, but also the toughness of the material will be poor, and when stretched and compressed, the material is easy to brittle and crack. When the material of the outer skin layer 22 is too soft, although the touch is relatively comfortable, the strength is weak, and irreversible deformation and damage of the outer shape are easy to occur. Optionally, the hardness (Shore A type) of the silicone material of the outer skin layer 22 is in the range of 40°-80°, so that it has good touch, good toughness and strength, and is not easy to brittle and crack, and the like. Further optionally, the hardness of the outer skin layer 22 is 50°-70°, and more further optionally 55°-65°, to further ensure the effect.

[0084] In some embodiments, the mass of the rear hanging 2 is in the range of 3-8 g, which is the mass of the parts of the earphone other than the sound generating unit 10, the ear hanging 3 and the functional pocket 4, including the mass of the wire 20, the elastic metal wire 21, the outer skin layer 22 and the connector 23 (if any). If the mass of the rear hanging 2 is too heavy, the overall weight of the earphone will increase, affecting the wearing experience, and when the earphone is worn and moved, the rear hanging 2 will easily swing up and down, making the earphone unstable to wear. If the mass of the rear hanging 2 is too light, although it meets the lightweight design requirement of the earphone, the diameter of the elastic metal wire 21 is too small, resulting in poor strength and elasticity, and the earphone is easy to fall off when worn, or while ensuring the diameter of the elastic metal wire 21, the thickness of the outer skin layer 2 cannot be guaranteed, and when the rear hanging 2 is bent, the outer skin layer 2 is easy to break. In order to balance the lightweight design of the earphone and consider the reasonable distribution of the overall weight of the earphone among the various components, so that the weight distribution is uniform, the center of gravity of the earphone is as close to the front as possible, and other practical requirements, so that the earphone can avoid the phenomenon of backward inclination when worn (the so-called backward inclination refers to the center of gravity of the earphone close to the rear hanging 2, and the rear hanging 2 falls backward after the user wears it). The mass of the rear hanging 2 is set to 3-8 g, which is more appropriate, can reduce the swing of the rear hanging 2 during movement, and is also beneficial to guarantee the diameter size of the elastic metal wire 21 and the thickness of the outer skin layer 22, so that the rear hanging 2 has good elasticity and use reliability. Further optionally, the mass of the rear hanging 2 is in the range of 4-7 g, and more further optionally, the mass of the rear hanging 2 is in the range of 5-6 g, for example, it can be 5 g, 5.2 g, 5.4 g, 5.6 g, 5.8 g or 6 g, etc., to further guarantee the effect.

[0085] The outer skin layer 22 has a minimum cross section, the cross section of the outer skin layer 22 refers to a cross section obtained by cutting the outer skin layer 22 along a radial plane of the outer skin layer 22, and the minimum cross section is a cross section having a minimum cross-sectional area among the obtained cross sections, the cross-sectional area refers to an area of a region enclosed by an outer contour of the cross section. Optionally, a ratio of the diameter D8 of the elastic metal wire 21 to the width W2 of the minimum cross section is in a range of 0.2-0.6. When the width W2 of the minimum cross section of the outer skin layer 22 is constant, if the ratio is too large, the elastic metal wire 21 is too thick, the clamping force of the back hanging 2 is too large, the wearing experience is poor, and the outer skin layer 22 is relatively thin and is more likely to break when bending. At the same time, in the production process, the wire 20 and the elastic metal wire 21 coated by the outer skin layer 22 are prone to exposure and other defects, resulting in low yield and increasing production cost. If the ratio is too small, the clamping force is too small, and the back hanging 2 is prone to falling off and poor wearing stability. The ratio of the diameter D8 of the elastic metal wire 21 to the width W2 of the minimum cross section is in a range of 0.2-0.6, which is beneficial to make the diameter D8 of the elastic metal wire 21 and the thickness of the outer skin layer 22 coated outside the elastic metal wire 21 more appropriate, so as to obtain a suitable clamping force, ensure the bending performance of the outer skin layer 22, and improve the reliability and comfort of use. Further optionally, the ratio of the diameter D8 of the elastic metal wire 21 to the width W2 of the minimum cross section is in a range of 0.3-0.5, and more further optionally in a range of 0.35-0.45, to further ensure the effect.

[0086] Optionally, as shown in Figure 5 and Figure 6 , the minimum cross section having the minimum cross-sectional area is located on the symmetry plane 2a, or the cross section obtained by cutting the outer skin layer 22 along the symmetry plane 2a is the minimum cross section. At this time, the minimum cross section of the outer skin layer 22 is the middle cross section A (the cross section passing through the middle position) of the outer skin layer 22. For example, the outer contour of the cross section of the outer skin layer 22 can be designed in a gradually reduced form from the end portion 22a to the middle portion 22b, so that the cross section at the middle position has a smaller cross-sectional area. In this way, the quality of the middle portion of the back hanging 2 is relatively lighter than the end portion, which can further reduce the shaking during movement and improve the stability of wearing. At the same time, the size of the end portion 22a of the outer skin layer 22 is larger, and it is easier to install the mounting structure such as the connector 23, so as to achieve a better sealing effect.

[0087] In some embodiments, the cross section of the outer skin layer 22 is circular. In other embodiments, with reference to Figures 6 to 8 , the cross section of the outer skin layer 22 is flat, the length of the cross section is greater than the width, for example, it can be Figure 6The outer skin layer 22 is shown as an ellipse. Alternatively, the outer periphery of the outer skin layer 22 is smoothly transitioned without protrusions or recesses, etc. to make it more comfortable to wear. The outer periphery of the outer skin layer 22 refers to the surface excluding the end surface of the two end portions. It is understood that when the cross section is a regular shape (e.g. a rectangle, an ellipse, etc.) or an approximate regular shape, the length and width of the cross section are interpreted in their usual meanings. When the cross section is an irregular shape, the distance between the two points on the outer contour that are farthest apart is taken as the length of the cross section, 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 in the width direction. Alternatively, 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 or coincident with the reference plane B. The length direction X2 of the end portion 22a of the outer skin layer 22 is not perpendicular to the reference plane B, i.e. the length direction of the cross section of the outer skin layer 22 changes in angle from the middle portion to the end portion 22a of the outer skin layer 22 to improve the overall strength of the outer skin layer 22. Alternatively, the angle change is 60° to 90°, i.e. the angle between the length direction X1 of the middle cross section A and the length direction X2 of the end portion 22a of the outer skin layer 22 is 60° to 90°. Further alternatively, the length direction X2 of the end portion 22a of the outer skin layer 22 is parallel or coincident with the reference plane B, so that the length direction X1 of the middle cross section A of the outer skin layer 22 is perpendicular to the length direction X2 of the end portion 22a, and the length direction of the cross section of the outer skin layer 22 changes by 90° from the middle portion to the end portion 22a of the outer skin layer 22.

[0088] The length and width of the cross section can be controlled by controlling the size of the outer skin layer 22 in different portions, e.g. the size of the outer skin layer 22 in the earphone height direction (in the illustrated embodiment, the earphone height direction is perpendicular to the reference plane B) does not change or gradually increases from the middle portion 22b to the end portion 22a of the outer skin layer 22, the size of the outer skin layer 22 in the direction perpendicular to the earphone height direction gradually increases, and the rate of increase is greater than the rate of increase of the size of the outer skin layer 22 in the earphone height direction, and the size of the cross section perpendicular to the earphone height direction increases as it approaches the end portion of the outer skin layer 22, so that the length of the end portion 22a of the outer skin layer 22 becomes perpendicular to the length of the middle cross section A.

[0089] It can be understood that the intermediate cross section A has the smallest cross-sectional area and the lowest strength, and is most prone to torsional deformation. When worn, if the middle part of the rear hanging 2 is torsionally deformed, the two sound generating units 10 will be misaligned up and down, affecting the comfort and stability of wearing. By setting the intermediate cross section A perpendicular to the reference plane B in the length direction X1, the stiffness and strength of the intermediate cross section A in the length direction X1 can be effectively improved, thereby improving the resistance to torsion, so that the sound generating unit 10 is not prone to misalignment up and down when worn. Further, at the end of the skin layer 22, since the cross-sectional area is relatively larger, the ability to resist torsional deformation is better, and when the earphone is worn, at the position of the end 22a, the bending force in the direction of the reference plane B is mainly borne. By setting the length direction of the first outer end surface 2d parallel or coinciding with the reference plane B, the ability to resist bending deformation in this direction can be improved, and the connection strength of the connection position of the skin layer 22 and the functional compartment 4 can be ensured.

[0090] It should be noted that although setting the cross section of the intermediate cross section A perpendicular to the reference plane B in the length direction X1 can obtain relatively better anti-torsion effect, it is not necessarily perpendicular, for example, when the length direction X1 and the reference plane B form an included angle of 70°-90°, a better anti-torsion effect can still be obtained. In addition, the change angle of the length direction of the cross section of the skin layer 22 from the middle position to the end 22a of the skin layer 22 is not necessarily 90°, for example, it can be 60°-90°, so that the length direction of the end of the skin layer 22 and the reference plane B have a relatively small included angle, which is beneficial to improve the ability to resist bending deformation in this direction, and ensure the connection strength of the connection position of the skin layer 22 and the functional compartment 4. At the same time, it is beneficial to make the width W3 of the connector 23 larger, thereby further ensuring the connection strength of the rear hanging and the functional compartment.

[0091] In order to further ensure the anti-torsion performance of the rear hanging 2 and prevent the sound generating unit 10 from misaligning up and down when pulled apart, optionally, the length direction of the cross section of at least the first curved portion 2b forms an included angle of 70°-90° with the reference plane B, further optionally, perpendicular to the reference plane B, and more further 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.

[0092] Optionally, as shown in Figure 8 Figure 8 ​The schematic diagram of the end of the skin layer 22 viewed along the insertion direction is shown, for the sake of clarity, the hole structure and the like of the cooperation between the skin layer 22 and the connector 23 are not shown, the ratio of the length L1 of the end of the skin layer 22 and the length L2 of the middle cross section A ranges from 3.2 to 1.2, so that the overall structure of the back hanging 2 has good structure performance, in addition, when the area of the middle cross section A meets the requirements, for example, is a certain value, the ratio is too large, which will lead to the length L1 and the width W1 of the end 22a of the skin layer 22 being too large, and further lead to the volume of the functional compartment 4 being too large, affecting the appearance, and also increasing the overall weight, changing the wearing center of gravity, and reducing the stability. If the ratio is too small, the connector 23 will be too small in size, which is easy to be pulled out of the functional compartment 4, and also will lead to the wall thickness (or thickness, shell thickness, etc.) of the connector cooperation position shell being too thin, which is easy to crack due to insufficient strength. The ratio is set to 3.2-1.2, which makes the ratio more appropriate, the overall quality and size of the earphone are more appropriate, and the wearing stability and comfort are better. Further, the ratio of the length L1 and the length L2 is 3-1.9, and further 2.7-2.2, to further ensure the effect.

[0093] Optionally, the width W2 of the middle cross section A is 1.6-4mm, if the cross section is too large, the volume of the back hanging 2 will increase, the weight will increase, and the wearing experience will be affected; if the cross section is too small, it is easy to cause wire leakage and skin damage during use, and the yield during production is too low. Further, the width W2 of the middle cross section A is 1.9-3.5mm, further 2.3-3.1mm, and further 2.7-2.9mm, for example, it can be 2.7mm, 2.8mm or 2.9mm, etc., so that the width W2 of the middle cross section A is more appropriate.

[0094] It should be noted that, with reference to Figure 8 , the width W1 and the length L1 of the end 22a of the skin layer 22 refer to the width and length of the outer contour of the projection of the end 22a of the skin layer 22 along the insertion direction on a plane perpendicular to the insertion direction. It should be noted that when the outer contour of the object is a regular shape (such as a rectangle, an ellipse, etc.) or an approximate regular shape, the length and width of the outer contour are interpreted in their usual sense, and when the outer contour is an irregular shape, unless otherwise specified, the distance between the two points with the farthest distance is taken as the length of the outer contour, the connecting line of 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 when the back hanging 2 is inserted into the functional compartment 4, which is basically consistent with the extension direction (or length direction) of the connector 23 and the axis direction of the insertion hole 405 (see Figure 10 ).

[0095] 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.

[0096] 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.

[0097] 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 on 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 represents the contact force of the sound unit 10 on 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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 to 3 mm. 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 to 2.5 mm, and even more optionally, it is 1.7 to 2 mm, in order to further achieve a balance between volume and weight and sealing effect.

[0102] 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° to 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 significant. Setting the included angle α3 to 10° to 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° to 55°, and even more optionally, it is 40° to 50°, for example, it can be 40°, 45° or 50°, to further ensure the effect.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] Optionally, the connecting surface 241 is parallel to or coincides with the insertion direction.

[0107] It should be noted that when defining the included angle and relative position between two surfaces (for example, parallel or non-parallel), the surface can be a plane or a curved surface. When the surface is a plane, the included angle and relative position with the surface are the included angle and relative position with the plane in which the surface lies. When the surface is a curved surface, the most convex point or the most concave point of the curved surface has a tangent plane. At this time, 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 described above can be a plane or a curved surface (not necessarily a plane or a curved surface at the same time). When the second outer end surface 240 and / or the first outer end surface 2d and / or the connecting surface 241 is a curved surface, the surface on the shell 40 in contact with it is also provided as a curved surface, so that the two can be closely fitted. Figure 11b In the embodiment shown, both of the second outer end surfaces 240 are curved surfaces, the most concave point of which has a tangent plane 240a, the connecting surface 241 and the first outer end surface 2d are planes, the included angle α3 refers to the included angle between the connecting surface 241 and the tangent plane 240a, and the included angle α4 refers to the included angle between the first outer end surface 2d and the tangent plane 240a. In other embodiments, the first outer end surface 2d and the second outer end surface 240 can be planes. It can be understood that a plane is easier to process and has better dimensional accuracy than a curved surface. However, when the contact area between the shell 40 and the outer skin layer 22 is a curved surface, the contact area is usually larger than that of a plane, thereby facilitating improvement of the sealing effect.

[0108] It can be understood that although this paper takes the end 22a of the outer skin layer 22 as an example to introduce the arrangement of two cutting grooves 24, the end of the backrest 2 can be provided with one or more cutting grooves 24, thereby forming one or more second outer end surfaces 240 and connecting surfaces 241. Further, when multiple cutting grooves 24 are provided, the cutting grooves 24 can be arranged in various ways, for example, along the length direction of the end 22a or along the width direction of the end 22a. Figure 11a and Figure 13a , Figure 11a and Figure 13a Some embodiments provided with two cutting grooves 24 are shown, in which, Figure 13a In the embodiment shown, the two cutting grooves 24 are arranged along the width direction of the end 22a, and the depth of the cutting groove 24 farther away from the first outer end surface 2d is deeper, thereby forming two second outer end surfaces 240 with different depths on the same side of the first outer end surface 2d, Figure 11a In the embodiment shown, the two cutting grooves 24 are arranged along the length direction of the end 22a, one of which is deeper, thereby forming two second outer end surfaces 240 with different depths on the same side of the first outer end surface 2d. In other embodiments, multiple second outer end surfaces 240 can be located on both sides of the first outer end surface 2d, as shown in FIG. 6. Figure 13b, the number of the cut slots 24 is three, and two cut slots 24 are arranged on one side of the second outer end surface 240, and one cut slot 24 is arranged on the other side of the second outer end surface 240, so that two first outer end surfaces 240 and two connecting surfaces 241 are formed on one side of the second outer end surface 240, and one first outer end surface 240 and one connecting surface 241 are formed on the other side of the second outer end surface 240. Obviously, when there are only two second outer end surfaces 240, the two second outer end surfaces 240 can be arranged on the two sides of the first outer end surface 240 respectively. It can be understood that when the number and position of the cut slots 24 are changed, the position of the shell 40 matched with the end of the rear hanging 2 is adjusted accordingly, and the shell 40 and the rear hanging 2 are arranged in a profiled manner to realize the matching, so that each second outer end surface 240 is in contact with the shell 40, thereby further improving the sealing performance and positioning effect.

[0109] Optionally, when the end 22a of the outer skin layer 22 is provided with two or more second outer end surfaces 240, the first outer end surface 2d and each second outer end surface 240 are arranged in parallel, or at least two of the first outer end surface 2d and each second outer end surface 240 are arranged in parallel, or each of the first outer end surface 2d and each second outer end surface 240 is arranged in parallel, so as to further increase the contact area and ensure the sealing effect.

[0110] It can be understood that the contact surfaces between the outer skin layer 22 and the shell 40 can be sealed by glue to further increase the sealing effect and the connection strength between the two. Since the contact surfaces between the outer skin layer 22 and the shell 40 have relatively larger areas, the application area of the glue is increased, the operation space is increased, and the glue can be more reliably retained between the contact surfaces of the outer skin layer 22 and the shell 40 after being extruded through the contact surfaces without being easily spilled, which is beneficial to ensuring a good appearance.

[0111] It can be understood that when there are multiple second outer end surfaces 240, it is not necessary that each second outer end surface 240 is in contact with the shell 40, and a good waterproof effect can be achieved when some of the second outer end surfaces 240 are in contact with the shell 40. Of course, when all the first outer end surfaces 2d and the second outer end surfaces 240 are in contact with the shell 40, a better waterproof effect can be achieved.

[0112] It can be understood that in other embodiments, the end 22a of the outer skin layer 22 can also not be provided with the cut slots 24, and only one first outer end surface 2d exists.

[0113] In some embodiments, the shell 40 has a rear end surface 40a facing the side where the rear hanging 2 is located, and the connector hole 405 is arranged on the rear end surface 40a and extends into the shell 40. The shell 40 of the conventional connector structure is usually provided with a tubular connecting portion 920 extending outward, which is used to connect with the connector 23, and the connector hole 405 is arranged on the rear end surface 40a of the shell 40 and extends into the shell 40. Figure 10In 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 of using the connector 23, 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 thinner 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 between the outer shell 40 and the connector 23 is not limited by the structural space and can directly utilize the thickness of the outer shell 40. When the rear hanger 2 is subjected to outward pulling force, the tensile strength of the connection point between the outer shell 40 and the rear hanger 2 is stronger and less prone to cracking.

[0114] 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.

[0115] In some embodiments, reference Figure 14 and Figure 15The connector 23 has a flat first surface 23b. Optionally, the connector 23 has a rectangular cross section perpendicular to the direction of the connector, including the case of a rectangle and an approximate rectangle, for example, the four corners can be provided with bevels or rounded corners, to form a relatively flat first surface 23b and a second surface 23c opposite to the first surface 23b, and two opposite side surfaces 23a connected between the first surface 23b and the second surface 23c. The first surface 23b and the second surface 23c are located at both ends of the thickness direction of the connector 23, and the two side surfaces 23a are located at both ends of the width direction of the connector 23. Optionally, the first surface 23b and the connecting surface 241 are both flat, and the first surface 23b is parallel to the connecting surface 241 of the slot 24 (including parallel and approximately parallel), which is beneficial to improve the position and size accuracy of the two, facilitate the process allowance and gap control of the assembly process, and at the same time, the appearance is more beautiful, and the mold forming process is simpler. Further optionally, the first surface 23b, the second surface 23c and the side surface 23a are all flat, the first surface 23b is parallel to the second surface 23c, and the two side surfaces 23a are parallel.

[0116] In some embodiments, the outer peripheral surface of the connector 23 is provided with at least one protrusion 231 protruding outward in the radial direction (perpendicular to the length direction) thereof. The outer peripheral surface of the connector 23 refers to the surface of the connector 23 except the two end surfaces in the length direction, including the first surface 23b, the second surface 23c and the side surface 23a, etc. The protrusion 231 can be used for mold positioning. When it is necessary to injection mold the outer skin layer 22 outside the connector 23, the protrusion 231 can be positioned with the mold, thereby improving the positioning accuracy and preventing misplacement and deformation, and further reliably ensuring the connection strength of the connector 23 and the outer skin layer 22 and reducing the risk of the connector 23 falling off from the outer skin layer 22. For example, the protrusion 231 can be provided on at least one of the first surface 23b, the second surface 23c or the two side surfaces 23a. Optionally, the protrusion 231 is provided on the first surface 23b or the second surface 23c. Since the width of the connector 23 is greater than the thickness, the first surface 23b and the second surface 23c have relatively larger areas, which are more conducive to the positioning effect of the protrusion 231. For example, at least one protrusion 231 can be provided on the first surface 23b of the connector 23, and the protrusion 231 protrudes in the thickness direction of the connector 23. Optionally, at least part of the protrusion 231 is exposed on the coated outer skin layer 22, so that it can be used for positioning when the rear hanging 2 is assembled with the shell 40, as shown in FIGS. 12 and 13. A positioning groove 4020 is formed on the shell 40, and the positioning groove 4020 can be matched with the protrusion 231, thereby realizing the positioning of the connector 23 and the shell 40, making the relative position between the surfaces of the outer skin layer 22 and the shell 40 to be more accurate, thereby ensuring the waterproof and sealing effect. Figure 10 and Figure 12

[0117] ​Optionally, the boss 231 is at least partially exposed outside the at least one cutout 24, Figure 15 In the shown embodiment, the cutout 24 is located above the first outer end surface 2d, and the first surface 23b is the top surface of the connector 23. In other embodiments, the cutout 24 can also be located below the first outer end surface 2d, and the first surface 23b is the bottom surface of the connector 23.

[0118] The boss 231 can be partially exposed outside 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 strength.

[0119] In some embodiments, the projection area of the boss 231 on the surface (the first surface 23b in the figure) where the boss 231 is located along the thickness direction of the connector 23 is 0.5-2.5mm 2 A too small projection area of the boss 231 can result in insufficient strength of the boss 231 and can easily break, thus failing to reliably position the connector 23. A too large projection area of the boss 231 can increase the volume and affect the wall thickness of the shell 40 to which the connector 23 is to be connected, thus affecting the strength of the shell 40. The projection area of the boss 231 is set to 0.5-2.5mm 2 , which is conducive to ensuring the positioning effect of the boss 231 and the structural strength of the shell 40. Further optionally, the projection area of the boss 231 is 1-2mm 2 , and more further optionally 1.4-1.7mm 2 , to further ensure the effect.

[0120] In some embodiments, as shown in Figure 14 , the length L5 of the boss 231 in the width direction of the connector 23 is 0.2-1 times the width W3 of the connector 23. A too small ratio of the length L5 of the boss 231 to the width W3 of the connector 23 can result in insufficient strength of the boss 231 and a too short length of the boss 231, thus failing to effectively position the connector 23. A too large ratio of the length L5 of the boss 231 to the width W3 of the connector 23 can result in a too small distance between the boss 231 and the edge of the connector 23, thus affecting the positioning effect of the connector 23 in the length direction. Further optionally, the ratio of the length L5 of the boss 231 to the width W3 of the connector 23 is 0.4-0.8, and more further optionally 0.5-0.6, to further ensure the effect. Optionally, the boss 231 extends along the width direction of the connector 23, and the length of the boss 231 is consistent with the width direction of the connector 23.

[0121] The connection manner of the connector 23 and the functional compartment 4 can be, for example, a snap connection, a riveting fixation, a screw fixation, etc. In some embodiments, the connector 23 and the functional compartment 4 are fixed by a latching member. As shown in Figures 16 to 18As shown, the head-mounted sound production device further comprises a locking member, which comprises at least one locking arm 50. The connector 23 is provided with a receiving portion 232 corresponding in position and number to the locking arm 50. The shell 40 is provided with a through hole 403 corresponding in position and number to the locking arm 50, and the through hole 403 communicates with the connector hole 405. The through hole 403 and the receiving portion 232 are both used for inserting the locking arm 50. When the locking arm 50 is inserted into the receiving portion 232 through the through hole 403, part of the locking arm 50 is located in the shell 40 and part of the locking arm 50 is located in the connector 23, thereby limiting the connector 23 and preventing the connector 23 from being pulled out of the connector hole 405. The locking arm 50, the receiving portion 232 and the through hole 403 can also be fixed by dispensing, so as to further increase the connection firmness and waterproof performance.

[0122] The receiving portion 232 may, for example, be a semi-closed groove (for example Figure 19 communicating with the side surface 23a) or a closed hole (for example Figure 16 As shown, that is, the outer contour of the cross section of the receiving portion 232 cut by a plane perpendicular to the thickness direction of the connector 23 can be semi-closed or closed. Of course, it can also be other shapes capable of limiting the locking arm 50. Figures 16 to 18 In the embodiment shown, the locking member is columnar. It can be understood that the locking member only comprises one locking arm 50. Adaptively, the connector 23 is provided with one receiving portion 232, and the shell 40 is provided with one through hole 403. The number of the locking member is not limited to one. It can be more, for example Figure 19 and Figure 20 In the embodiment shown, the number of the locking member is two, which are located on both sides of the connector 23. Adaptively, the connector 23 is provided with two receiving portions 232, and the shell 40 is provided with two through holes 403. In addition, the locking member is not limited to be columnar. For example, the locking member can also be U-shaped, which comprises two locking arms 50 extending in the same direction and a connecting portion connected between the two locking arms 50. Adaptively, the connector 23 is provided with two receiving portions 232, and the shell 40 is provided with two through holes 403. It can be understood that two locking arms 50 can improve the connection firmness and positioning effect compared with one locking arm 50. For example, the locking arm 50 is less likely to be pulled off when the head-mounted sound production device is pulled.

[0123] Figure 19In the illustrated embodiment, the number of accommodation portions 232 is two, the axis of the accommodation portion 232 is consistent with the thickness direction of the connector 23, and the accommodation portions 232 are arranged along the width direction of the connector 23 and are in communication with the two side surfaces 23a, respectively. In this way, the two clamping arms 50 can be used to position the connector 23. Compared with the scheme of using a single clamping arm 50, the two clamping arms 50 can prevent the connector 23 from deflecting, and the positioning effect is better. Compared with the arrangement of two closed hole-shaped accommodation portions, the size reduction of the connector 23 in the width direction can be reduced, and the structural strength of the connector 23 can be ensured.

[0124] It can be understood that the accommodation portion 232 can or can not penetrate the connector 23, for example, it can be a blind hole. Optionally, the accommodation portion 232 penetrates the connector 23 to improve the positioning effect and facilitate processing.

[0125] Optionally, the material of the clamping member is a metal material, and further optionally an alloy material, for example, it can be stainless steel (such as SUS304, SUS430), cobalt-nickel alloy, high-strength carbon steel, aluminum alloy (for example, magnesium-aluminum alloy), titanium alloy, zinc alloy (such as lead-zinc alloy), or iron (here, iron refers to cast iron, i.e., iron-carbon alloy), etc. The metal material and the alloy material have good tensile strength, which is beneficial to ensure the reliability of the clamping member in limiting the connector 23.

[0126] Optionally, along the thickness direction of the connector 23, the ratio of the projection area of all the accommodation portions 232 on the same plane perpendicular to the thickness direction of the connector 23 to the projection area of the connector 23 is 2% to 10%. The projection area of the accommodation portion 232 refers to the area enclosed by the outer contour of the projection region of the accommodation portion 232 and the connector 23. The projection area of all the accommodation portions 232 is the sum of the projection area of each single accommodation portion 232. When calculating the projection area of the accommodation portion 232, if the accommodation portion 232 is an open slot, the two open ends of the accommodation portion 232 are connected by a line 232a to form a closed projection region. The projection area of the connector 23 includes the projection area of the accommodation portion 232. Figure 21 When the projection area of the connector 23 is constant, if the ratio is too large, the accommodation portion 232 is too large, which will affect the overall strength of the connector 23, and the connector 23 is prone to breakage due to insufficient strength. If the ratio is too small, the notch of the accommodation portion 232 is too small, the position of the accommodation portion 232 cannot be effectively positioned, and the cross section of the clamping arm 50 is too small, which has poor strength. Further optionally, the ratio of the projection area of the accommodation portion 232 on the same plane perpendicular to the thickness direction of the connector 23 to the projection area of the connector 23 is 3% to 6%, and more further optionally 3.5% to 5%, to further ensure the strength of the connector 23 and the clamping arm 50 and ensure the connection effect.

[0127] Optionally, when the connector 23 is positioned by the stopper, the stopper is not exposed outside the shell 40 to ensure a good appearance. Further optionally, the stopper is located inside the shell 40 to prevent the user from easily removing the stopper from the outside, improving the reliability of the product. In some embodiments, as shown in Figure 10 、 Figure 12 、 Figure 17 and Figure 18 , the shell 40 includes a main housing 404 and a cover 407 connected to the main housing 404, the main housing 404 has an open end 4040, and the cover 407 covers the open end 4040. The main housing 404 includes a first shell portion 4041 located opposite 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 located opposite each other, the first shell portion 4041, the second shell portion 4042, and the cover 407 are arranged in sequence along the height direction Z3 of the functional compartment 4 and are connected between the two third shell portions 4043. The first shell portion 4041, the second shell portion 4042, and the two third shell portions 4043 form a connector hole 405. The through hole 403 is provided on the second shell portion 4042 and communicates with the connector hole 405. When the stopper is inserted into the through hole 403 to position the connector 23, it will be located inside the shell 40. When the shell 40 is installed with the cover 407, the stopper is located in the closed space formed by the main housing 404 and the cover 407, and the stopper cannot be seen from the outside, which is more beautiful. Optionally, a receiving hole 406 corresponding to the through hole 403 is provided on the first shell portion 4041, and the clamping arm 50 can pass through the through hole 403 and enter the receiving hole 406, further improving the positioning effect and optimizing the stress structure.

[0128] It can be understood that in other embodiments, the stopper can also be exposed outside the shell 40. The through hole 403 is not limited to being provided on the second shell portion 4042, for example, it can also be provided on the first shell portion 4041 or the third shell portion 4043. However, since the first surface 23b and the second surface 23c of the connector 23 have a relatively large area and have more sufficient space, it is preferred that the receiving portion 232 is provided on the first surface 23b and / or the second surface 23c, and correspondingly, the through hole 403 can be provided on the first shell portion 4041 or the second shell portion 4042.

[0129] Optionally, in some embodiments, when the connector 23 is positioned by two or more clamping arms 50, the clamping arms 50 are spaced apart along the length direction of the connector 23. In other embodiments, as shown in Figure 19 , the clamping arms 50 are spaced apart along the width direction of the connector 23 to save space in the connector direction.

[0130] Optionally, the axis direction of the clamping arm 50 and the through hole 403 is perpendicular to the plug-in direction of the plug-in part 23, so as to facilitate processing and assembly, and the limiting effect is better.

[0131] The clamping connection has many advantages compared with the hook connection, pin riveting and screw fixing. For example, when the hook connection is used, the material of the plug-in part 23 is generally PA material, which is easy to absorb moisture and expand, causing the cracking of the other part (i.e., the shell 40). In order to improve the waterproof performance, a sealing ring usually needs to be arranged outside the plug-in part 23, and the structure of the plug-in part 23 is more complex, which increases the process and cost. In addition, the structure of the hook easily increases the volume of the functional compartment, which is not conducive to the miniaturization of the functional compartment. For another example, after the pin riveting connection, there are traces of the combination of the pin and the plastic on the appearance, and a layer of elastic material such as silicone needs to be coated outside, which increases the process and cost. For another example, the structure space required for the screw fixing is large, which does not meet the lightweight design of the bone conduction earphone.

[0132] Through the clamping connection, the plug-in part 23 can be effectively positioned and fixed, and at the same time, the structure is relatively simple, the space occupation is small, which is conducive to reducing the cost, realizing the lightweight design of the bone conduction earphone, and improving the appearance beauty. Further, in combination with the multi-surface contact sealing mode described above, the sealing performance of the connection between the rear hanging part 2 and the functional compartment 4 can be reliably ensured.

[0133] The plug-in part 23 can be made of a material with high strength, good tensile strength and yield strength, for example, PA (polyamide), PA+GF (composite material of polyacrylamide and glass fiber) or metal material, etc. Although the PA and PA+GF materials can meet the high strength requirement, they will swell and crack the shell part assembled therewith due to moisture absorption, which affects the reliability of use. Therefore, the earphone can be used in a relatively dry environment.

[0134] Optionally, the plug-in part 23 is made of a metal material, and further optionally made of an alloy material, for example, aluminum alloy (such as magnesium aluminum alloy), zinc alloy or magnesium alloy, etc. Compared with PA and PA+GF, the alloy material has higher tensile strength, and the volume can be made smaller, so that the volume of the functional compartment 4 can be further reduced, thereby further realizing the lightweight design. Moreover, the alloy material will not swell due to moisture absorption, and the reliability and durability are better. For example, among the metal materials, the zinc alloy has a smaller density (6.75 g / cm 3 ) and higher tensile strength, and under the same strength, the volume can be made smaller, the thickness of the corresponding position of the shell 40 and the plug-in part 23 is larger, the strength is strengthened, and the cracking is not easy, the reliability is better, and at the same time, the volume of the shell 40 can also be made smaller.

[0135] In some embodiments, the plug-in part 23 is made of a metal material, such as Figure 14As shown, the width direction of the connector 23 is consistent with the length direction X2 of the end of the outer skin layer 22, and the ratio of the width W3 of the connector 23 to the length L1 of the end of the outer skin layer 22 is 0.4-0.8. When the width of the end of the outer skin layer 22 is constant, if the ratio is too large, the weight of the connector 23 increases, the thickness of the outer skin layer 22 reserved on both sides becomes small, the assembly air tightness is poor, and the waterproof effect is poor; if the ratio is too small, the connector 23 becomes small, the strength is insufficient, the effect of the connector 23 covering the elastic metal wire 21 is poor, and the connector 23 is easy to fall off the elastic metal wire 21. Further, the ratio of the width W3 of the connector 23 to the length L1 of the end of the outer skin layer 22 is 0.5-0.7, and more further, the ratio is 0.55-0.65, so as to further ensure the effect, and make the size of the connector 23 and the size of the end of the outer skin layer 22 more reasonable.

[0136] The outer skin layer 22 has a first outer end point O1 on the outermost side in the length direction of the end 22a thereof. In order to further ensure the firmness of the connection between the connector 23 and the outer skin layer 22, in the width direction of the connector 23, the distance D4 between the connector 23 and the first outer end point O1 of the outer skin layer 22 is 0.8-2 mm. When the size of the end 22a of the outer skin layer 22 is constant, if the distance D4 is too large, the size of the connector 23 in the width direction will be too small, the overall strength is poor, and the connector 23 is easy to fall off the elastic metal wire 21; if the distance D4 is too small, the size of the connector 23 in the width direction is too large, which affects the area of the region where the left and right sides of the rear hanging 2 contact the shell 40, and the assembly air tightness is poor. Further, the distance D4 is 1-1.6 mm, and more further, the distance D4 is 1.1-1.3 mm, so as to make the size of the connector 23 and the rear hanging 2 more appropriate, and further ensure the firmness of the connection between the connector 23 and the outer skin layer 22 and the waterproof effect after the connection between the rear hanging 2 and the functional compartment 4.

[0137] Further, the position of the connector 23 relative to the outer skin layer 22 in the thickness direction also affects the firmness of the connection between the connector 23 and the outer skin layer 22 and the waterproof effect after the connection between the rear hanging 2 and the functional compartment 4. As shown, Figure 14As shown, the outer skin layer 22 has a second outer end point O2 which is the outermost in the width direction of the end portion 22a. In the thickness direction of the connector 23, the distance D5 between the connector 23 and the second outer end point O2 of the outer skin layer 22 is 0.8-2 mm, which refers to the distance between the first surface 23b and the second surface 23c of the connector 23 and the corresponding second outer end point O2, without considering the boss or similar structure arranged on the surface. When the size of the end portion of the rear hanging 2 is fixed, if the distance D5 is too large, the size of the connector 23 in the thickness direction will be too small, the overall strength will be poor, and the connector 23 is easy to fall off the elastic metal wire 21; if the distance D5 is too small, the size of the connector 23 in the thickness direction will be too large, which affects the area of the region where the upper and lower sides of the rear hanging 2 contact the shell 40, and the assembly sealing performance is poor. Further, the distance D5 is 1-1.6 mm, and more preferably 1.1-1.3 mm, so that the size of the connector 23 and the rear hanging 2 is more appropriate, and the connection firmness of the connector 23 and the outer skin layer 22 and the waterproof effect after the rear hanging 2 is connected to the functional compartment 4 are further ensured.

[0138] It can be understood that the connector 23 is not in communication with 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, so that the surface of the end portion 22a around the outside of the connector 23 can contact the shell 40 to achieve good sealing effect, and ensure the connection effect of the outer skin layer 22 and the connector 23. Optionally, the connector 23 is arranged centrally relative to the end portion 22a of the outer skin layer 22, so as to ensure that the sealing effect of the four sides is more uniform. In some embodiments, the ratio of the distance D4 and the distance D5 is 0.9-1.1, so that the outer skin layer 22 has a thickness close to the width direction and the thickness direction of the connector 23, so that the connector 23 can be more firmly wrapped in the outer skin layer 22. Further, the ratio of the distance D4 and the distance D5 is 1, at this time, the outer skin layer 22 has a thickness close to the width direction and the thickness direction of the connector 23, which further ensures the reliability of the connection between the outer skin layer 22 and the connector 23.

[0139] In some embodiments, the ratio of the projected area of the end portion 22a of the connector 23 and the outer skin layer 22 in the same plane perpendicular to the length direction of the connector 23 to the length of the connector 23 is 0.2-0.7. The projected area refers to the area enclosed by the outer contour of the projection of the connector 23 and the outer skin layer 22 in the same plane. When the size of the end portion of the outer skin layer 22 is constant, a too large ratio will result in a thinner thickness of the portion wrapped outside the connector 23, a poorer wrapping force, and an easy leakage of the connector 23; a too small ratio will result in a smaller size and weaker strength of the connector 23, and an easy rupture of the connector 23 under external force. The ratio is set to 0.2-0.7, which is beneficial to ensure the connection strength of the connector 23 and the outer skin layer 22 while ensuring the structural strength of the connector 23. Further optionally, the ratio of the projected area of the end portion of the connector 23 and the outer skin layer 22 in the same plane perpendicular to the length direction of the connector 23 to the length of the connector 23 is 0.25-0.5, and more further optionally 0.3-0.4, to further ensure the effect.

[0140] It can be understood that, compared with a conventional connector made of plastic, the connector 23 made of metal material generally has a smaller size, and therefore the distance D4 and the distance D5 of the connector 23 made of metal material described above can be relatively larger, the ratio of the width W3 to the length L1 of the end portion of the outer skin layer 22 and the ratio of the projected area of the end portion 22a of the connector 23 and the outer skin layer 22 can be relatively smaller, so that the connection strength of the connector 23 and the outer skin layer 22 is better, and the connector 23 is not easy to separate from the outer skin layer 22.

[0141] As Figure 12 and Figure 15As shown, the outer skin layer 22 covers part of the connector 23, the connector 23 has an inner end inside the outer skin layer 22 and an outer end outside the outer skin layer 22, and optionally, the ratio of the length L4 of the part of the connector 23 exposed outside the outer skin layer 22 to the length L5 of the part of the connector 23 inside the outer skin layer 22 is 0.9-1.8. When the length L6 of the connector 23 is constant, if the distance ratio is too large, the length L5 is too short, and the connector 23 is prone to fall off from the outer skin layer 22; if the distance ratio is too small, the length L4 is too short, the length of the connector 23 at the connection position is too short, the strength of the connection position is insufficient, and the rear hanging 2 is prone to fall off from the shell 40. By setting the ratio of the length L4 to the length L5 to 0.9-1.8, the connection length of the connector 23 and the outer skin layer 22 and the connection length of the connector 23 and the shell 40 can be more appropriate, which is conducive to ensuring the reliability of the connection of the connector 23 and the outer skin layer 22 and the shell 40. The length L4 of the part of the connector 23 exposed outside the outer skin layer 22 refers to the size of the part of the connector 23 exposed outside along the length direction of the connector 23, even if only part of the exposed part (for example, the upper surface is exposed and the lower surface is not exposed) is calculated in the length dimension, and the length L5 of the part of the connector 23 inside the outer skin layer 22 can be obtained by subtracting the length L4 from the length L6 of the connector 23. In some embodiments, the length L4 of the part of the connector 23 exposed outside the outer skin layer 22 is greater than the length L5 of the part of the connector 23 inside the outer skin layer 22, so as to further ensure the effective length of the connector 23 connected to the shell 40 at the connection position, and ensure the strength and stability of the connection. Further optionally, the ratio of the length L4 to the length L5 is 1-1.6, and more further optionally 1.2-1.4, so as to further ensure the reliability of the connection of the connector 23 and the outer skin layer 22 and the shell 40.

[0142] In order to further improve the reliability of the connection of the connector 23 and the outer skin layer 22, as shown in Figure 16 As shown, the part of the connector 23 inside the outer skin layer 22 is provided with a first groove 233, and the outer skin layer 22 is partially filled in the first groove 233, which can increase the contact area of the outer skin layer 22 and the connector 23, thereby improving the reliability of the connection of the connector 23 and the outer skin layer 22. The number of the first grooves 233 can be one or more. Figure 16In the shown embodiment, one side surface 23a of the connector 23 in the width direction is provided with outwardly protruding lengthwise extending ribs 235, two first grooves 233 are naturally formed on the upper and lower sides (in the thickness direction of the connector 23) of each rib 235, so that two first grooves 233 are provided 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 of the connector 23 in the width direction to form four first grooves 233, and optionally, the two ribs 235 on the two sides are symmetrically arranged. Optionally, the surface of the rib 235 is flush with the side surface 23a.

[0143] Further optionally, a protruding strip 236 is provided on the outer circumferential surface of the connector 23, which protrudes radially outwardly, 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 at the same time can play a hooking role, which is conducive to preventing the connector 23 from being pulled out of the outer skin layer 22, and further improving the firmness of the connection between the connector 23 and the outer skin layer 22. Figure 16 In the shown embodiment, the protruding strip 236 and the boss 231 are arranged 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 protruding strip 236 can also be arranged on the second surface 23c or the side surface 23a. It can be understood that the width of the connector 23 is relatively larger than the thickness, so arranging the protruding strip 236 on the first surface 23b or the second surface 23c can make the protruding strip 236 have a larger size, thereby improving the connection effect. Optionally, the protruding strip 236 extends along the width direction of the connector 23.

[0144] In order to further improve the connection effect of the protruding strip 236, optionally, the shortest distance between the boss 236 and the surface of the end of the outer skin layer 22 along the length direction of the connector 23 is not less than 0.6mm, so that the outer skin layer 22 wrapped in front of the boss 236 has a relatively thicker thickness, and the blocking effect on the connector 23 is better, so that the connector 23 is less likely to separate from the outer skin layer 22 along the length direction. As Figure 12 Optionally, the distance L9 between the protruding strip 236 and the boss 231 is 2-5mm, so that the boss 231 and the protruding strip 236 are separated by a relatively thick outer skin layer 22, further ensuring the connection strength. Figure 12 In the shown embodiment, the protruding strip 236 is flush with the end surface of the connector 23 inside the outer skin layer 22.

[0145] It can be understood that by providing the first groove 233 and / or the protrusion 236 and the like on the connector 23, the connection strength between the connector 23 and the skin layer 22 can be effectively improved, even if the length L5 of the part of the connector 23 located inside the skin layer 22 is short, the good connection effect can be ensured. In particular, when the connector 23 is made of metal material, the volume of the connector 23 can be relatively smaller, and the contact area with the skin layer 22 is also smaller. By providing the above structure, the connection strength between the skin layer 22 and the connector 23 can be better ensured.

[0146] In some embodiments, as shown in Figure 15 、 Figure 16 and Figure 21 , the outer end of the connector 23 is provided with a guide surface 2370 on both sides in the width direction, and the two guide surfaces 2370 form a small outer and large inner taper to guide the insertion of the connector 23 into the connector hole 405. The guide surface 2370 can be a bevel or a curved surface, for example. The outer end of the connector 23 refers to the end of the part of the connector 23 located outside the skin layer 22, and the inner end refers to the end of the part of the connector 23 located inside the skin layer 22. Figure 16 In some embodiments, the protrusion 236 is provided on the inner end.

[0147] In some embodiments, the outer end of the connector 23 is provided with a second groove 238 on one side or both sides in the width direction (consistent with the width direction of the connector 23). Figure 15 and Figure 16 In the embodiment shown in the drawings, the second groove 238 is provided on only one side of the end of the connector 23, but in other embodiments, the second groove 238 can also be provided on both sides. A positioning protrusion (not shown in the drawings) matching the second groove 238 is provided in the connector hole 405 of the housing 40. When the connector 23 is inserted into the connector hole 405, the positioning protrusion matches the second groove 238, thereby playing a positioning function in the thickness direction, improving the position accuracy, thereby further ensuring that the contact surfaces of the housing 40 and the skin layer 22 can be accurately aligned and contacted, improving the sealing effect and the consistency of the overall assembly appearance gap, and the appearance gap refers to the misalignment gap formed by the cooperation of the rear hanging 2 and the housing 40.

[0148] The number of the second groove 238 is not limited. For example, in some embodiments, a guide rib (not shown in the drawings) similar to the rib 235 can be provided on one side or both sides of the outer end of the connector 23 in the width direction. The guide rib is outwardly protruding and extends along the insertion direction. Two second grooves 238 are formed on both sides of the guide rib in the thickness direction (consistent with the thickness direction of the connector 23). The guide surface 2370 is formed on the guide rib, and a guide hole matching the guide rib is provided in the connector hole 405, thereby further playing a positioning effect. Optionally, the outer surface of the guide rib is flush with the side surface 23a.

[0149] Optionally, referring to Figure 21 , the length L8 of the second groove 238 is 0.5-1.2 mm, so that it can play a good positioning effect, further optionally, the length L8 of the second groove 238 is 0.6-1 mm, and more further optionally, 0.7-0.9 mm, to further ensure the positioning effect. The length of the second groove 238 refers to the size along the length direction of the connector 23.

[0150] The number of the second grooves 238 is not limited to four, for example, it can be 1-4, or more, and optionally, the number of the second grooves 238 can be adjusted by changing the number and position of the guide ribs.

[0151] The wire 20 passes through the connector 23 to enter the functional compartment 4, and in some embodiments, as shown in Figure 15 , Figure 16 and Figure 22 , the connector 23 is provided with a receiving groove 239 extending along the length direction and penetrating through both ends of the connector 23, the receiving groove 239 simultaneously opens from the outer peripheral surface of the connector 23, that is, the receiving groove 239 simultaneously 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 into the functional compartment 4 from the skin layer 22, and at the same time, the receiving groove 239 can play a limiting role on the wire 20, ensuring the positional accuracy of the connector 23 and the wire 20 when the skin layer 22 is molded by the mold. Optionally, the skin layer 22 further comprises 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 from the outer peripheral surface of the connector 23, can press the wire 20, and increase the overall sealing effect, so that the waterproof performance of the earphone is more superior, at the same time, the embedding of the covering portion 220 into the connector 23 increases the contact area with the connector 23, so that the connection strength of the connector 23 and the skin layer 22 is better, and the risk of peeling or falling off of the skin layer 22 from the connector 23 is reduced. 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 to the connector 23 is flush with the outer peripheral surface (second surface 23c in the figure) of the connector 23 provided with the receiving groove 239, which is beneficial to simplify the mold, so that the parting surface of the mold of the connector 23 and the skin layer 22 is in the same plane, greatly reducing the possibility of overflow of the material of the skin layer 22, making the sealing between the skin layer 22 and the connector 23 better, preventing water from penetrating, and thus improving the waterproof performance of the earphone. Further optionally, the end surface 220b of the covering portion 220 exposed to the connector 23 is flush with or recessed into the end surface 23d of the outer end portion of the connector 23, so that the covering portion 220 does not affect the cooperation with the jack hole 405.

[0152] The accommodation groove 239 can be opened from the first surface 23b, the second surface 23c or the side surface 23a of the connector 23. Since the first surface 23b and the second surface 23c of the connector 23 have relatively larger areas, the accommodation groove 239 can be optionally opened from the first surface 23b or the second surface 23c of the connector 23. Further, when the first surface 23b is provided with the boss 231 or the protrusion 236 and the like, the second surface 23c can be optionally exposed so that the boss 231 and the protrusion 236 have appropriate sizes to ensure the respective functions of the boss 231 and the protrusion 236.

[0153] The depth H2 of the accommodation 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 surface of the wire 20 covered by the cladding portion 220, i.e., the cladding portion 220 is semi-surrounded outside the wire 20 rather than fully surrounded, can save the space in the thickness direction of the connector 23 while ensuring the sealing effect, thereby facilitating miniaturization. Further optionally, in the cross section perpendicular to the length direction of the connector 23, the cladding portion 220 covers more than 50% of the area of the outer contour of the cross section of the wire 20 to ensure the sealing effect. It can be understood that in other embodiments, the cladding portion 220 can also be fully surrounded outside the wire 20 to further enhance the waterproof performance.

[0154] It can be understood that, compared with conventional plastic materials, the connector 23 made of metal materials generally has a smaller volume. In some embodiments, the connector 23 is made of metal materials and has a volume in the range of 20-80 mm 3 The product of the length L6 (referring to the maximum distance along the length direction of the connector 23 between the two end surfaces along the length direction of the connector 23), the width W3 (referring to the maximum distance along the width direction of the connector 23 between the two side surfaces along the width direction of the connector 23) and the thickness H1 (referring to the maximum distance along the thickness direction of the connector 23 between the first surface 23b and the second surface 23c of the connector 23) of the connector 23 can be taken as the volume of the connector 23. The boss 231 and the protrusion 236 and the like have a small overall volume and have little effect on the size of the overall volume of the connector 23 and do not affect the specific structural design of the connector 23, so they are not included in the volume of the connector 23 when calculating. If the volume of the connector 23 is too large, the weight increases, the outer skin layer 22 covering the outside of the connector 23 becomes thin, and the connector 23 is prone to leakage from the outer skin layer 22; if the volume of the connector 23 is too small, the overall strength of the connector 23 is insufficient and the connector 23 is prone to breakage. The volume of the connector 23 is set in the range of 20-80 mm 3 , which is conducive to ensuring the cladding effect of the outer skin layer 22 and the structural strength of the connector 23. Further optionally, the volume of the connector 23 is in the range of 30-70 mm 3Further, the length of the plug 23 can be 40-50 mm. 3 to further ensure the effect.

[0155] In some embodiments, the plug 23 is made of metal material, and the mass of the plug 23 is 1.5-5 g. If the mass of the plug 23 is too large, the weight of the earphone will be increased, which affects the wearing comfort. If the mass of the plug 23 is too small, the strength of the plug 23 will be poor, which is not conducive to reliable connection. The mass of the plug 23 is set to 1.5-5 g, which is conducive to making the plug 23 have a proper mass and ensuring the reliability of the connection. Further, the mass of the plug 23 can be 2-4 g, and further, the mass of the plug 23 can be 2.5-3.5 g to further ensure the effect.

[0156] In some embodiments, the ratio of the mass of the plug 23 (referring to a single plug 23) to the mass of the rear hanging part 2 is 0.2-0.4. If the ratio is too large, the mass of the plug 23 will be too large, which will increase the weight of the earphone and affect the wearing comfort. If the ratio is too small, the mass of the plug 23 will be too small, which will make the strength of the plug 23 poor and not conducive to the reliability of the connection. The ratio of the mass of the plug 23 to the mass of the rear hanging part 2 is set to 0.2-0.4, which controls the mass of the plug 23 and the weight of the entire rear hanging part 2, makes the center of gravity of the rear hanging part 2 more appropriate, and improves the wearing comfort. Further, the ratio of the mass of the plug 23 to the mass of the rear hanging part 2 can be 0.25-0.35, and further, the ratio of the mass of the plug 23 to the mass of the rear hanging part 2 can be 0.27-0.33 to further ensure the effect.

[0157] The elastic metal wire 21 is connected to the plug 23 and penetrates into the plug 23 to be fixed to the plug 23. For example, a connecting hole 234 extending along the length direction of the plug 23 can be arranged on the plug 23, and the elastic metal wire 21 is arranged in the connecting hole 234. In some embodiments, the ratio of the projection area of the elastic metal wire 21 to the projection area of the plug 23 in the same plane perpendicular to the length direction of the plug 23 is 5%-20%. If the ratio is too large, the elastic metal wire 21 is too thick, the clamping force is large, the wearing experience is painful, and the thickness of the plug 23 covered outside the elastic metal wire 21 is thin and easy to break. If the ratio is too small, the elastic metal wire 21 is too thin and easy to break, and the clamping force is insufficient and easy to fall off. Further, the ratio of the projection area of the elastic metal wire 21 to the projection area of the plug 23 in the same plane perpendicular to the length direction of the plug 23 can be 7%-13%, and further, the ratio of the projection area of the elastic metal wire 21 to the projection area of the plug 23 in the same plane perpendicular to the length direction of the plug 23 can be 9%-12% to make the thickness of the elastic metal wire 21 more appropriate, ensure that the clamping force is appropriate, and make the connection of the plug 23 and the elastic metal wire 21 more reliable.

[0158] In some embodiments, the end of the elastic metal wire 21 does not protrude the end surface 23d of the outer end of the plug 23. In other embodiments, as shown inFigure 23 and Figure 24 As 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 to 2 mm. When the length L7 is too long, during the manufacturing process, the elastic metal wire 21 itself is twisted, resulting in poor straightness and making it difficult to fit 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 to 1.2 mm, and even more optionally, it is 0.7 to 0.9 mm, so that the elastic metal wire 21 can achieve a good mold positioning effect.

[0159] 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.

[0160] 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 wire-passing hole 23e has a closed hole-shaped cross-section, such as 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).

[0161] The cross-sectional shape of the portion of the elastic wire 21 located in the connector 23 can be circular or flat, including but not limited to rectangular or elliptical, and the like. The shape can be designed according to the bonding force between the connector 23 and the elastic wire 21. When the bonding force is sufficient, the portion of the elastic wire 21 located in the connector 23 can have a circular cross-section, which has good strength and does not require additional processing, and is relatively low in cost. When the bonding force is insufficient, at least part of the portion of the elastic wire 21 located in the connector 23 can be provided with a flat cross-section to increase the bonding strength.

[0162] It should be noted that the embodiments herein can be combined with each other without conflict, thereby obtaining more embodiments.

[0163] The above is only a specific implementation of the present application, and any improvement made on the basis of the concept of the present application is considered to be within the protection scope of the present application.

Claims

1. A rear-mounted accessory, characterized in that, include: Wire (20); The outer sheath (22) covers the outside of the conductor (20); as well as, A connector (23) is provided at the end of the outer skin layer (22); The wire (20) passes through the connector (23). The connector (23) is provided with a receiving groove (239) extending along its length and opening from the outer peripheral surface of the connector (23). The wire (20) is disposed in the receiving groove (239). The outer sheath (22) includes a covering part (220) disposed in the receiving groove (239) and sealing the opening of the receiving groove (239) exposed from the outer peripheral surface of the connector (23).

2. The rear-mounted spare tire as described in claim 1, characterized in that, The covering part (220) is flush with the outer peripheral surface of the connector (23).

3. The rear-mounted spare tire as described in claim 1, characterized in that, The receiving groove (239) communicates with the end face (23d) of the connector (23) located outside the outer skin layer (22). The end face (220b) of the covering part (220) exposed outside the connector (23) is flush with or recessed into the end face (23d) of the connector (23) located outside the outer skin layer (22).

4. The rear-mounted spare tire as described in claim 1, characterized in that, The receiving slot (239) extends through both ends of the connector (23) along its length.

5. The rear-mounted spare tire as described in claim 1, characterized in that, The connector (23) also includes a wire hole (23e) communicating with the receiving groove (239), and the wire (20) is simultaneously passed through the wire hole (23e) and the receiving groove (239). The receiving groove (239) is connected to the end face (23d) of the connector (23) located outside the outer skin layer (22).

6. The rear-mounted spare tire as described in claim 1, characterized in that, The outer peripheral surface includes a first surface (23b) and a second surface (23c) located at both ends in the thickness direction of the connector (23) and two side surfaces (23a) located at both ends in the width direction of the connector (23), and the receiving groove (239) opens from the first surface (23b), the second surface (23c) or the side surface (23a).

7. The rear-mounted spare tire as described in claim 6, characterized in that, The width of the connector (23) is greater than its thickness, and the receiving groove (239) opens from the first surface (23b) or the second surface (23c).

8. The rear-mounted spare tire as described in claim 7, characterized in that, It also includes an elastic metal wire (21), the outer skin layer (22) covers the outside of the elastic metal wire (21), the end of the elastic metal wire (21) is connected to the connector (23), the end of the elastic metal wire (21) does not protrude from the end face (23d) of the connector (23) located outside the outer skin layer (22), or the end of the elastic metal wire (21) protrudes from the end face (23d) of the connector (23) located outside the outer skin layer (22).

9. The rear-mounted spare tire as described in claim 8, characterized in that, The elastic metal wire (21) and the conductor (20) are spaced apart along the width direction of the connector (23).

10. The rear-mounted spare tire as described in claim 6, characterized in that, The first surface (23b) is provided with an outwardly protruding boss (231) and / or a protruding strip (236), and the receiving groove (239) opens from the second surface (23c); The boss (231) is at least partially exposed outside the outer skin layer (22); The protrusion (236) is located entirely inside the outer skin layer (22).

11. The rear-mounted spare tire as described in claim 10, characterized in that, The projected area of ​​the boss (231) on its surface along the thickness direction of the connector (23) is 1-2 mm. 2 .

12. The rear-mounted spare tire as described in claim 10, characterized in that, The ratio of the length L5 of the boss (231) to the width W3 of the connector (23) is 0.2 to 1, and the boss (231) extends along the width direction of the connector (23).

13. The rear-mounted spare tire as described in claim 10, characterized in that, The protrusion (236) extends along the width direction of the connector (23).

14. The rear-mounted spare tire as described in any one of claims 1 to 10, characterized in that, On a cross section perpendicular to the length direction of the connector (23), the covering portion (220) covers the surface of the conductor (20).

15. The rear-mounted spare tire as described in claim 13, characterized in that, On 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 conductor (20).

16. A head-mounted sound-generating device, characterized in that, include: The rear-mounted (2) as described in any one of claims 1 to 15; Two sound-producing units (10); Two functional compartments (4) for accommodating a control circuit board and / or a battery, the rear mount (2) connecting between the two functional compartments (4) and plugging into the functional compartments (4) via the connector (23); and, The ear hook (3) connects the sound-generating unit (10) and the functional compartment (4).

17. The head-mounted sound-generating device as described in claim 16, characterized in that, The head-mounted sound device includes a locking element (5) that is at least partially inserted into the functional compartment (4) and the connector (23), the connector (23) being made of metal.

18. The head-mounted sound-generating device as described in claim 16 or 17, characterized in that, The aforementioned head-mounted sound device is a bone conduction headphone.

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