A rear-mounted and head-mounted sound-generating device

Abstract

The present invention discloses a back-hanging and head-mounted sound-generating device, which relates to the technical field of sound-generating devices. The back-hanging includes a wire, an elastic metal wire, an outer skin layer and a connector. The outer skin layer covers the outside of the wire and the elastic metal wire. The connector is arranged at the end of the outer skin layer. The connector is made of metal material, and the outer skin layer covers part of the connector. Along the length direction of the connector, the ratio of the projection area of ​​the connector and the end of the outer skin layer on the same plane perpendicular to the length direction of the connector is 0.2 to 0.7. It is beneficial to ensure the structural strength of the connector while ensuring the connection strength between the connector and the outer skin layer, and it is beneficial to make the connection strength between the connector and the outer skin layer better and not easy to separate from the outer skin layer.

Description

[0001] Priority information: This application claims priority to Chinese patent application No. 202411184984.3 filed on August 27, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present invention relates to the technical field of sound-generating devices, and in particular to a back-hung and head-mounted sound-generating device. Background Art

[0003] Head-mounted sound-generating devices, such as headphones, all include a sound-generating device that can generate sound. According to the different ways of sound transmission, the sound-generating device can be divided into a bone conduction sound-generating device and an air conduction sound-generating device. Headphones containing a bone conduction sound-generating device are usually called bone conduction headphones.

[0004] A known earphone structure includes two earphone heads, two functional compartments, a back hook connected between the two functional compartments, and an ear hook connected between the functional compartment and the earphone head. There are two ear hooks. When the earphone is worn, the ear hook is hung on the ear of the human body, and the back hook is wrapped around the back of the head. The functional compartment may contain a control circuit board and / or a battery. Usually, one functional compartment is mainly used to install a control circuit board (often called a control compartment), and the other functional compartment is mainly used to store batteries (often called a battery compartment).

[0005] Headphones can not only be used as office entertainment products, but can also be used during sports, such as running. Some bone conduction headphones with good waterproof performance can even be used while swimming.

[0006] Although headphone products have become more mature, there is still some room for improvement. For example, when using headphones during exercise, if the headphones are not worn firmly enough, they may easily shake up and down, affecting the user experience and listening experience, and may even fall off.

[0007] For example, if the design of the back hook structure is unreasonable, in some cases (such as when the back hook is bent), a folding point is likely to appear, resulting in the back hook being unable to reliably return to its original shape, causing permanent deformation and affecting the normal use of the headphones. Furthermore, the outer skin of some headphones may even rupture when the back hook is bent significantly, affecting the appearance and reliability of use.

[0008] For example, the anti-twisting performance of the back hanging of some headphones is poor. When the headphones are worn, the two earphone heads are easily misaligned up and down, affecting the listening experience and wearing comfort.

[0009] In addition, when used in a humid environment (such as swimming or rainy days), the waterproof performance of the earphones is required to be high. The back hanging and the functional compartment of some earphones are connected by a plug-in structure. If water leakage is prone to occur at the plug-in part, it will also affect the reliability of the earphones.

[0010] like Fig.26 and Fig. 27 As shown, Fig.26 and Fig. 27 The plug-in structure diagram of the back hook and the function compartment of some headphones is shown. The back hook 90 includes a plug 91, which is connected to the shell of the function compartment through the plug 91. The plug 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, after being combined with the matching functional compartment 92, the strength is insufficient and it is easy to shake or break with a little force. In addition, the tail of the connector 91 needs to have a hook 93 to be stuck on the functional compartment. In this way, part of the functional compartment 92 will inevitably be occupied by the hook. A certain space, resulting in the inability to make the relevant plastic parts smaller, and the functional compartment is relatively large. Furthermore, the functional compartment 92 needs to be provided with a tubular connecting part 920 extending outward to accommodate the connector 91, which further increases the volume of the functional compartment 92 and the complexity of the structure. When the functions of the earphones gradually increase, certain components will inevitably be added. The volume of the functional compartment is too large, which will cause discomfort when wearing.

[0012] Second, when the earphones are submerged in water, water may penetrate into the connector 91 along the assembly gap between the ear hook and the functional compartment. The connector 91 is generally made of PA66. Although this type of material has high strength, it is highly hygroscopic. After contact with water, the overall volume will increase and remain so for a long time. At this time, the expanded part of the connector 91 will expand the plastic shell part that cooperates with it, and the plastic shell will produce a large internal stress that cannot be released. After a period of time, cracks will appear in the shell or part of it will fall off, causing functional failure, seriously affecting product quality and user experience, and it is very difficult to repair after failure, which will also increase after-sales costs.

[0013] Third, the contact surface 94 between the rear hanging 90 and the functional compartment 92 is usually a single plane, and the waterproof area that can prevent water from entering the functional compartment 92 is limited. If glue is applied to seal the contact surface 94 between the functional compartment 92 and the rear hanging 90, the glue will overflow due to the small area, causing a poor appearance.

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

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

[0016] The above contents are only used to help understand the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0017] The object of the present invention is to provide a back-hanging and head-mounted sound-generating device to solve at least one problem existing in the prior art.

[0018] To achieve the above-mentioned purpose, the present invention provides a rear suspension, comprising:

[0019] wire;

[0020] Elastic wire;

[0021] an outer layer, covering the outside of the conductive wire and the elastic metal wire; and

[0022] A connector is arranged at the end of the outer skin layer, the connector is made of metal material, and the outer skin layer covers part of the connector;

[0023] Along the length direction of the connector, the ratio of the projection areas of the connector and the ends of the outer skin layer on the same plane perpendicular to the length direction of the connector is 0.2 to 0.7.

[0024] On the other hand, the present invention provides a head-mounted sound-emitting device, comprising:

[0025] The rear suspension as described above;

[0026] Two sound units;

[0027] Two functional compartments, each of which is used to accommodate a control circuit board and / or a battery, the rear hook is connected between the two functional compartments, the functional compartment includes a housing, and the connector of the rear hook is plugged into the housing; and,

[0028] An ear hook, wherein the sound-emitting unit and the functional compartment are connected via the ear hook.

[0029] Compared with the prior art, the present invention has the following beneficial effects: according to at least one embodiment of the present invention, the connector is made of metal material, and along the length direction of the connector, the ratio of the projection area of ​​the connector and the end of the outer skin layer on the same plane perpendicular to the length direction of the connector is 0.2 to 0.7, which is beneficial to ensure the connection strength between the connector and the outer skin layer while ensuring the structural strength of the connector. Compared with traditional plastic connectors, connectors made of metal materials usually have a smaller volume, which can make the ratio smaller, and the part of the outer skin layer covering the outside of the connector is thicker, so that the connection strength between the connector and the outer skin layer is better and it is not easy to separate from the outer skin layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is a stereoscopic schematic diagram of a head-mounted sound device according to some embodiments of the present specification.

[0031] Figure 2 It is a schematic diagram of a sound unit of a head-mounted sound device according to some embodiments of the present specification.

[0032] Figure 3a It is a three-dimensional schematic diagram of a rear hanger according to some embodiments of the present specification.

[0033] Figure 3b yes Figure 3a Exploded view of the rear suspension shown.

[0034] Figure 4a yes Figure 1 A top view of the head mounted sound device is shown.

[0035] Figure 4b yes Figure 1 A side view of the head mounted sound device is shown.

[0036] Figure 5 yes Figure 3a The front view of the rear suspension is shown.

[0037] Figure 6 is along Figure 5 Section view obtained by cutting along the AA cutting line.

[0038] Figure 7 1 is a schematic diagram of the structure of the outer skin layer according to some embodiments of the present specification. In the figure, the outer skin layer is cut off in the middle.

[0039] Figure 8 yes Figure 7 Schematic representation of the end of the outer cortex is shown.

[0040] Fig. 9 yes Figure 1 A three-dimensional schematic diagram of the connection between the middle functional compartment and the rear hanging.

[0041] Fig.10 It is a three-dimensional schematic diagram of a functional warehouse according to some embodiments of the present specification.

[0042] Fig.11a It is a three-dimensional schematic diagram of the end of the outer skin layer according to some embodiments of the present specification.

[0043] Fig.11b yes Fig.11a A side view of the end of the outer layer is shown.

[0044] Fig.12 It is a connection diagram of the functional compartment and the rear suspension according to some embodiments of this specification.

[0045] Fig.13ais a schematic diagram of the end of the outer skin layer according to some embodiments of the present specification.

[0046] Fig.13b is a schematic diagram of the end of the outer skin layer according to some embodiments of the present specification.

[0047] Fig.14 is a schematic diagram of the end of a rear hanger according to some embodiments of the present specification.

[0048] Fig.15 yes Figure 3a Enlarged view of part I in the middle.

[0049] Fig.16 1 is a schematic diagram of the connection between a connector and a locking member according to some embodiments of the present specification. In the figure, there is one locking member.

[0050] Fig.17 It is a schematic diagram of the positions of the locking member and the housing according to some embodiments of the present specification, and the number of the locking member is one.

[0051] Fig.18 It is a cross-sectional schematic diagram of the connection between the locking member and the housing and the connector according to some embodiments of the present specification, and the number of the locking member is one.

[0052] Fig.19 It is a connection diagram of a connector and a locking member according to some embodiments of the present specification, and the number of the locking members is two.

[0053] Fig. 20 It is a cross-sectional schematic diagram of the connection between the locking member and the housing and the connector according to some embodiments of the present specification, and the number of the locking members is two.

[0054] Fig.21 is a top view of a connector according to some embodiments of the present specification.

[0055] Fig. 22 is a schematic diagram of a rear hanging end according to some embodiments of the present specification.

[0056] Fig.23 is a schematic diagram of a rear hanging end portion according to some embodiments of the present specification, in which the elastic metal wire passes through the connector.

[0057] Fig.24 yes Fig.23 Side view of the structure shown.

[0058] Fig.25 is a cross-sectional view of a connector according to some embodiments of the present specification.

[0059] Fig.26 It is a three-dimensional schematic diagram of the connection between the rear hook and the functional compartment hook in some embodiments.

[0060] Fig. 27 It is a cross-sectional schematic diagram of the connection between the rear hook and the functional compartment hook in some embodiments. DETAILED DESCRIPTION

[0061] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0062] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0063] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] like Figure 1 As shown, the embodiment of this specification describes a head-mounted sound-emitting device, which can be worn on a human head and enable a person to hear sound, for example, by bone conduction and / or air conduction. The head-mounted sound-emitting device includes a sound-emitting unit 10 and a wearing mechanism 11 connected to the sound-emitting unit 10. The sound-emitting unit 10 is used to emit sound, and the wearing mechanism 11 is used to wear the sound-emitting unit 10 on a human head so that the sound can be easily heard by a person. Exemplarily, the sound-emitting unit 10 is worn to a position corresponding to a human ear.

[0065] Figure 1The head-mounted sound-emitting device shown in the figure is a binaural earphone, which includes two sound-emitting units 10 (or earphone heads), and includes a rear hanger 2 suitable for surrounding the back of the head, two ear hangers 3 suitable for hooking on the ears, and two functional compartments 4, the functional compartment 4 is used to accommodate a control circuit board and / or a battery, for example, the two functional compartments 4 are respectively a control compartment for accommodating a control circuit board and a battery compartment for accommodating a battery, and for another example, each functional compartment 4 accommodates a control circuit board and / or a battery. The rear hanger 2 is connected between the two functional compartments 4, the two sound-emitting units 10 are respectively arranged corresponding to the two functional compartments 4, and the sound-emitting units 10 and the corresponding functional compartments 4 are connected through ear hangers 3. Taking the two functional compartments 4 as an example, the rear hanger 2 is connected between the control compartment and the battery compartment, and the control compartment and one of the sound-emitting units 10 and the battery compartment and the other sound-emitting unit 10 are connected through an ear hanger 3. The head-mounted sound-emitting device is symmetrical as a whole to improve the wearing comfort.

[0066] Optionally, the head-mounted sound-generating device is a bone conduction headset, and a bone conduction sound-generating device 100 capable of generating vibration is provided in the sound-generating unit 10 thereof. When the bone conduction headset is used, the sound-generating unit 10 is located in front of the ear and fits the facial skin, and transmits mechanical vibration to the skin and further to the human auditory system, so that the person can hear the sound. Further optionally, the sound-generating unit 10 of the head-mounted sound-generating device also includes an air conduction sound-generating device 101, which can generate air conduction sound by means of diaphragm vibration, and the sound-generating unit 10 is provided with a sound outlet 1021 for emitting air conduction sound.

[0067] Figure 2In the illustrated embodiment, the sound unit 10 includes a housing component 102 and a bone conduction sound device 100 and an air conduction sound device 101 both disposed in the housing component 102. The housing component 102 has a proximal end 1020 close to the human ear when the head-mounted sound device is worn. The air conduction sound device 101 is disposed close to the proximal end 1020 relative to the bone conduction sound device 100 and is configured to emit sound toward the proximal end 1020. The proximal end 1020 is provided with a sound outlet 1021. In this way, the air conduction sound device 101 can emit sound toward the proximal end 1020. The sound-generating device 101 can be close to the human ear and emit sound toward the ear, which helps the directness and clarity of the sound, reduces the loss and distortion of the sound, enables people to hear louder air-conducted sound, has higher sound efficiency and better effect, and can appropriately reduce the volume of the air-conducted sound-generating device 101, which is conducive to miniaturization. In addition, the bone-conducting sound-generating device 100 is far away from the sound outlet 1021, which can reduce the interference caused by the internal sound waves emitted from the sound outlet 1021 when the bone-conducting sound-generating device 100 vibrates. It can be understood that the proximal end 1020 is also the end of the shell component 102 close to the functional compartment 4, and the sound outlet 1021 is opened on the end surface of the shell component 102 facing the functional compartment 4. It can be understood that although the present specification takes binaural headphones as an example, the head-mounted sound-generating device is not limited to binaural headphones, and can also be electronic devices such as hearing aids, audio glasses, VR devices, and AR devices.

[0068] In some embodiments, Figure 3a and Figure 3b As shown, the rear hanging 2 includes a wire 20, an elastic metal wire 21, and an outer skin layer 22 covering the wire 20 and the elastic metal wire 21. The two ends of the rear hanging 2 are respectively connected to the two functional compartments 4. The wire 20 extends into the functional compartment 4 and is electrically connected to the electronic components in the functional compartment 4. The elastic metal wire 21 can keep the rear hanging 2 in a specific shape and provide a clamping force (or contact force, squeezing force, etc.) to drive the sound unit 10 to keep close to the facial skin during use. In some embodiments, the rear hanging 2 also includes two connectors 23 arranged at the two ends of the outer skin layer 22, and the connectors 23 are used to be plugged and fixed with the functional compartment 4.

[0069] It should be noted that the drawings of the present application all show structural schematic diagrams of the head-mounted sound-emitting device when it is in a natural state when not worn.

[0070] In some embodiments, Figure 4a As shown, Figure 4a The top view of the head-mounted sound-emitting device is shown. In the figure, the head-mounted sound-emitting device is in a natural state, and the whole is symmetrical about the symmetry plane 2a. The outer skin 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 figure, the approximate boundary between the first curved portion 2b and the second curved portion 2c is shown by a dotted line. The first curved portion 2b is in the shape of an arc, which is symmetrical about the symmetry plane 2a. The second curved portion 2c extends in the direction away from the first curved portion 2b and is in the shape of a curve (for example, it can be an arc or other curve) that bends toward the side where 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 curve, for example, a curve with a changing curvature. The arc curvature is uniform. When the user wears the earphone, each point in the first curved portion 2b of the back hanger 2 is subjected to uniform force, and the clamping force on the left and right ears is more uniform. The back hanger 2 is not easy to produce a folding point (fixed force point) due to excessive curvature changes. The folding point may cause the back hanger 2 to twist up and down, thereby causing uneven force on the left and right sides, resulting in discomfort when wearing. In severe cases, due to long-term uneven force, it may break.

[0071] In the embodiment described in this specification, the plane where 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-view direction is perpendicular to the reference plane B, and the head-mounted sound-emitting device is observed from top to bottom. Optionally, the center line of the elastic metal wire 21 is located on the reference plane B. The earphone has a width direction perpendicular to the symmetry plane 2a and a length direction parallel to the symmetry plane 2a. The back hanger 2 has two left endpoints O4 and a right endpoint O5 located at the outermost sides in the width direction of the earphone and a rear endpoint O6 located at the outermost sides in the length direction. The plane formed by the left endpoint O4, the right endpoint O5 and the rear endpoint O6 is parallel (or substantially parallel) to the reference plane B and the distance is close (even overlapped), and can be approximated as the reference plane B.

[0072] The arc shape of the first curved portion 2b can be understood as its center line being an arc shape, and the middle line of the inner and outer contours of the first curved portion 2b in the top view direction can be approximated as the center line of the first curved portion 2b, and the middle line is equidistant from the inner and outer contours (for example, multiple positions can be taken on the inner and outer contours of the first curved portion 2b, and the line connecting the midpoints of the width direction of each position can form the middle line). Similarly, the curve shape of the second curved portion 2c can be understood as its center line being a curve shape, and the middle line of the inner and outer contours of the second curved portion 2c in the top view direction can be approximated as the center line of the second curved portion 2c, and the center O3 is the center of the circle where 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.

[0073] In some embodiments, the diameter of the first curved portion 2b ranges from 80 to 120 mm, and 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 becomes smaller, and it is easy to fall off when worn. If the diameter is too small, the clamping force is too tight, and it is easy to cause tenderness when worn. Further optionally, the diameter of the first curved portion 2b ranges from 90 to 110 mm, and further can be selected as 95 to 105 mm, for example, it can be 95 mm, 100 mm or 105 mm. This allows the back hanging 2 to have a more appropriate clamping force and be more comfortable to wear. When wearing the headphones for exercise, it can also maintain a stable wearing condition and is not easy to loosen or fall off.

[0074] In some embodiments, the center angle α1 of the first curved portion 2b ranges from 100° to 180°, and the center angle α1 is the angle between the center O3 of the first curved portion 2b and the two connecting lines 2e between the two ends of the first curved portion 2b. For example, the center O3 and the two ends of the middle line of the first curved portion 2b can be connected to form two connecting lines 2e, and the connecting line 2e can also be used as the dividing line between the first curved portion 2b and the second curved portion 2c. If the angle is too large, the overall clamping force of the earphone will be too tight, and it is easy to feel tenderness when wearing. If the angle is too small, the overall clamping force of the earphone may be reduced, and due to the influence of the uneven overall curvature of the back hanging 2, it is easy to produce a fixed force point, and the back hanging is easy to break; further optionally, the center angle α1 of the first curved portion 2b ranges from 110° to 150°, and further can be selected from 115° to 125°, for example, it can be 115°, 120° or 125°, etc. To further ensure that the back hanging 2 has a suitable clamping force and improve the wearing comfort.

[0075] Continue to refer Figure 4a In the top view, the back hanging 2 has a reference surface 2f, which is a surface passing through the center O3 of the first curved portion 2b and perpendicular to the symmetry plane 2a and the reference plane B. When the center angle α1 is less than 180°, the two ends of each second curved portion 2c are respectively located on both sides of the reference surface 2f, and the spacing D6 between the two second curved portions 2c located at the reference surface 2f along the width direction of the head-mounted sound-emitting device is greater than the spacing D1 and D7 between their ends along the width direction of the head-mounted sound-emitting device. The spacing here refers to the spacing between the inner contours of the corresponding parts. In this way, the width of the back hanging 2 gradually increases toward the reference surface 2f, and the width gradually decreases after crossing the reference surface 2f, which can better adapt to the head shape, provide clamping force, and make wearing more comfortable.

[0076] In some embodiments, the ratio of the length of the first curved portion 2b to the length of the outer skin layer 22 of the rear hanging 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 thereof. Half of the sum of the length of the inner contour and the outer contour of the first curved portion 2b (or the outer skin layer 22) in the top view direction can be approximated as the length of the center line of the first curved portion 2b (or the outer skin layer 22). The length of the outer skin layer 22 does not include the covering portion 220 described below. It 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 force of the rear hanging 2 is, and the less likely it is to produce a folding point. Setting the ratio of the length of the first curved portion 2b to the length of the outer skin layer 22 of the rear hanging 2 to 0.4-0.6 is conducive to ensuring a suitable clamping force while further ensuring the overall anti-breaking performance of the rear hanging 2. Further optionally, the ratio of the length of the first curved portion 2b to the length of the outer skin layer 22 of the rear suspension 2 is 0.45-0.55, and further optionally 0.47-0.53, to further ensure the effect.

[0077] In some embodiments, when the earphone is in a natural state, there is a spacing distance D1 between the two ends of the outer skin layer 22, and the spacing distance D1 refers to the shortest distance between the two ends of the outer skin layer 22. The spacing distance D1 is related to the clamping force when the earphone is worn. Optionally, the ratio range of the spacing distance D1 and the diameter of the first curved portion 2b is 0.5-1.2. The setting of the clamping force needs to take into account both wearing comfort and stability. The specific clamping force can be adjusted by the ratio of the spacing distance D1 and the diameter of the first curved portion 2b. When the diameter of the first curved portion 2b is constant, the larger the ratio, the larger the distance between the two functional compartments 4. However, when the ratio is too large, it is easy to cause loose wearing, poor stability, and 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 stability. However, if the ratio is too small, it is easy to cause wearing pain. Setting the ratio range of the spacing distance D1 and the diameter of the first curved portion 2b to 0.5-1.2 can make the ratio range more suitable and the wearing stability and comfort better. Further optionally, the ratio of the spacing distance D1 to the diameter of the first curved portion 2b ranges from 0.6 to 0.9, and further optionally, the ratio of the spacing distance D1 to the diameter of the first curved portion 2b ranges from 0.7 to 0.8, so as to further ensure the effect.

[0078] Optionally, the two functional chambers 4 extend in a direction away from the first curved portion 2b and approach the symmetry plane 2a, such as Figure 4aAs shown, in the top view, the inner side surface of the functional compartment 4 has a contour line 4b. The angle α2 between the contour line 4b and the symmetry plane 2a is 15° to 60°. When the contour line 4b is a curve, the angle between the tangent of the most concave point or the most convex point of the contour line 4b and the symmetry plane 2a can be used as the angle α2. If the angle is too large, it is easy to cause wearing too tight and tenderness; if the angle is too small, it is easy to cause wearing too loose and easy to loosen and fall off. Setting the angle α2 to 15° to 60°, the angle is in a relatively suitable range, which is conducive to obtaining a suitable clamping force and ensuring the firmness and comfort of wearing. Further optionally, the angle α2 is 20° to 40°, and further can be selected as 25° to 30° to further ensure the effect.

[0079] Optionally, the extension direction of the functional compartment 4 is consistent with the extension direction of the end of the rear hanger 2, and is also consistent with the extension direction of the connector 23, so as to facilitate installation and ensure the clamping effect. The extension direction of the functional compartment 4 can be understood as the extension direction of its middle line 4a, and the middle line 4a is a line equidistant from the inner and outer contours of the functional compartment 4 in the top view direction (for example, multiple positions can be taken on the inner and outer contours of the functional compartment 4, and the line connecting the midpoints of the width direction of each position can form the middle line).

[0080] The elasticity of the rear hanging 2 is mainly provided by the elastic metal wire 21. Therefore, the effective length of the rear hanging 2 can be regarded as the length of the elastic metal wire 21. Figure 4b, the effective length of the back hook 2 (or the length of the elastic metal wire 21) ranges from 170 to 220 mm, the ear hook 3 has a contact point O7 with the ear, and the contact point O7 can be approximated as the highest point of the inner contour of the head-mounted sound device in the side view (left view or right view) direction, and the distance D9 from the rear end point O6 of the back hook 2 to the contact point O7 along the length direction of the earphone is 100 to 140 mm. The setting of the effective length value and the distance D9 is based on the consideration of wearing ergonomics. When the earphone is worn, a certain safety distance must be left between the back hook 2 and the head. When the distance is too short, due to the stretching deformation during wearing, some users will cause the head to hit the back hook 2 when wearing, and it will not be able to be worn in place; when the distance is too long, the clamping force is too small during wearing, and it is easy to loosen and fall off, and it will cause the back hook 2 to hit the seat or other obstacles during use, and lift the earphone. At the same time, the back hook 2 is prone to twisting and deformation when worn. During exercise, the tail of the back hook 2 will shake up and down, and the wearing stability will deteriorate. The effective length range of the back hanging 2 is set to 170-220 mm, and the distance D9 is set to 100-140 mm, so that the distance between the back hanging 2 and the head is more appropriate, ensuring the comfort of wearing and the firmness of clamping. Further optionally, the effective length of the back hanging 2 is 180-210 mm, and the distance D9 is 105-130 mm. Further optionally, the effective length of the back hanging 2 is 195-205 mm, for example, it can be 195 mm, 200 mm or 205 mm, and the distance D9 is 110-120 mm, for example, 110, 115 or 120 mm, to further ensure the effect.

[0081] Considering the ergonomics of the accommodation space for the glasses legs, optional, refer to Figure 1 By setting the geometric shape of the ear hook 3, the angle between the contact surface 10a between the earphone head and the human body and the inner side surface 4c of the functional compartment 4 is 150° to 170°. When the head-mounted sound device is worn on the human head, since the contact surface 10a is deflected toward the face, the ear hook 3 and the functional compartment 4 will deflect to a certain extent toward the side away from the head after wearing, which is conducive to forming a certain gap between the ear hook 3 and the head skin. The gap forms a space for placing the temples of the glasses, so that when the user wears the glasses, the temples of the glasses and the ear hook 3 of the earphone (especially the bent part of the ear hook 3) do not interfere or interfere less, making it more convenient to wear the glasses and the earphone at the same time, and enhancing the stability of the glasses. The angle between the contact surface 10a and the inner side surface 4c of the functional compartment 4 can be further selected to be 160° to 170°, and further selected to be 161° to 165°.

[0082] It is understandable that, in addition to providing the source of most of the clamping force, the rear hook 2 can also work together with the ear hook 3, the functional compartment 4, etc. to adjust the position of the sound unit 10. When the sound unit 10 includes an air-conducting sound-generating device 101 and a sound outlet 1021, the position of the sound outlet 1021 can be adjusted. After the ear hook 3 is set to a reasonable shape according to the above-mentioned angle rule, it cooperates with the structure, shape, size, setting angle of the functional compartment, etc. of the above-mentioned rear hook 2, so that the sound outlet 1021 of the earphone head can be close to the appropriate position beside the ear, so that the sound waves are transmitted to the eardrum through the shortest possible propagation path in the air, thereby improving the low-frequency sensitivity of the earphone, reducing distortion, and helping to reduce or prevent contact with the tragus, thereby improving wearing comfort. It is understandable that the sound hole 1021 needs to be configured at a suitable distance 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, the closer to the ear canal is not necessarily better. The closer to the ear canal, the more contact between the earphone head and the tragus. The tragus is a protruding cartilage structure and is more sensitive to vibration and external contact. Although the sound hole 1021 is close to the ear canal to increase sensitivity, the tragus will feel uncomfortable due to its sensitivity. Therefore, the sound hole 1021 should be configured at a suitable distance from the ear canal.

[0083] In order to make it more comfortable to wear, the material of the outer layer 22 is generally a soft elastic material, which feels better when it comes into contact with the skin. Common soft elastic materials include silicone, TPU (thermoplastic polyurethane elastomer), TPE (thermoplastic elastomer) and rubber. In some embodiments, considering the extreme application scenarios of the rear hanger (high and low temperature, high humidity, extreme bending and stretching, sweat and salt spray pollution) and the corresponding reliability test requirements, the material of the outer 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 user needs and experience.

[0084] The hardness of the silicone material of the outer skin layer 22 also has a 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 will the touch feel uncomfortable, but the toughness of the material will also deteriorate. When tension and compression occur, the material is prone to brittle cracking. When the material of the outer skin layer 22 is too soft, although the touch is relatively comfortable, the strength is weakened, and irreversible deformation and damage are prone to occur. Optionally, the hardness (Shore hardness A type) of the silicone material of the outer skin layer 22 ranges from 40° to 80°, so that it has a good touch, good toughness and strength, and is not prone to brittle cracking, deformation and other undesirable phenomena. Further optionally, the hardness of the outer skin layer 22 is 50° to 70°, and further can be 55° to 65° to further ensure the effect.

[0085] In some embodiments, the mass range of the back hanger 2 is 3 to 8g. The mass of the back hanger 2 is the mass of the earphone excluding the sound unit 10, the ear hanger 3 and the functional compartment 4, including the mass of the wire 20, the elastic metal wire 21, the outer skin 22 and the connector 23 (if any). If the back hanger 2 is too heavy, the weight of the whole device will increase, affecting the wearing experience. Moreover, when wearing the earphone for exercise, the back hanger 2 is easy to swing up and down, making the earphone unstable to wear; if the back hanger 2 is too light, although it meets the lightweight design requirements of the earphone, the diameter of the elastic metal wire 21 is too small, resulting in poor strength and elasticity, and it is easy to fall off when worn, or while ensuring the diameter of the elastic metal wire 21, the thickness of the outer skin 2 cannot be guaranteed, and when the back hanger 2 is bent, it is easy to cause the outer skin 2 to rupture. In order to take into account the lightweight design of the headset, and at the same time take into account the reasonable proportion of the weight of the headset between the various components, so that the weight is evenly distributed, the center of gravity of the headset is as far forward as possible, and other practical needs, so that the headset can avoid backward tilting when worn (the so-called backward tilt refers to the phenomenon that the center of gravity of the headset is close to the rear hanger 2, and the rear hanger 2 falls backward after the user wears it), the mass of the rear hanger 2 is set to 3-8g, which is more suitable, can reduce the shaking of the rear hanger 2 during exercise, and is also conducive to ensuring the diameter size of the elastic metal wire 21 and the thickness of the outer skin layer 22, so that the rear hanger 2 has good elasticity and reliability. Further optionally, the mass range of the rear hanger 2 is 4-7g, and further optionally, the mass range of the rear hanger 2 is 5-6g, for example, it can be 5g, 5.2g, 5.4g, 5.6g, 5.8g or 6g, etc., to further ensure the effect.

[0086] The outer skin layer 22 has a minimum cross section. The cross section of the outer skin layer 22 refers to the cross section obtained by cutting the outer skin layer 22 through a radial plane of the outer skin layer 22. The minimum cross section is the cross section with the minimum cross-sectional area among the obtained cross sections. The cross-sectional area refers to the area of ​​the area enclosed by the outer contour of the cross section. Optionally, the ratio of the diameter D8 of the elastic metal wire 21 to the width W2 of the minimum cross section is in the range of 0.2 to 0.6. When the width W2 of the minimum cross section of the outer skin layer 22 is constant, if the ratio is too large, the elastic metal wire 21 will be too thick, the clamping force of the rear hanging 2 will be too large, and the wearing experience will be poor. In addition, the outer skin layer 22 is relatively thin and more likely to break when bent. At the same time, during the production process, the conductor 20 and the elastic metal wire 21 covered by the outer skin layer 22 are prone to exposure and other defects, resulting in low yield and increased production costs. If the ratio is too small, the clamping force will be too small, and it will be easy to fall off when worn, and the wearing stability will be poor. Setting the ratio of the diameter D8 of the elastic wire 21 to the width W2 of the smallest cross section to be in the range of 0.2 to 0.6 is conducive to making the diameter D8 of the elastic wire 21 and the thickness of the outer skin layer 22 covering the outside of the elastic wire 21 more appropriate, thereby obtaining a suitable clamping force, ensuring the bending performance of the outer skin layer 22, and improving the reliability and comfort of use. Further optionally, the ratio of the diameter D8 of the elastic wire 21 to the width W2 of the smallest cross section is in the range of 0.3 to 0.5, and further can be selected as 0.35 to 0.45, to further ensure the effect.

[0087] Optional, such as Figure 5 and Figure 6 As shown, the smallest cross section with the smallest cross-sectional area is located on the symmetry plane 2a, or in other words, the cross section obtained by cutting the outer skin layer 22 through the symmetry plane 2a is the smallest cross section, and at this time, the smallest 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 set to gradually decrease from the end 22a to the middle 22b, so that the cross section at the middle position has a smaller cross-sectional area. In this way, the mass of the middle part of the rear suspension 2 is lighter than that of the end part, which can further reduce the shaking during movement and improve the stability of wearing. At the same time, the size of the end 22a of the outer skin layer 22 is larger, which makes it easier to install mounting structures such as the fixed connector 23 to achieve a better sealing effect.

[0088] In some embodiments, the cross-section of the outer skin layer 22 is circular. In other embodiments, Figures 6 to 8 The cross section of the outer skin layer 22 is flat, and the length of the cross section is greater than the width, for example, it can be Figure 6The ellipse shown. Optionally, the outer peripheral surface of the outer skin layer 22 is smoothly transitioned, and there is no structure such as a protrusion or a depression, so that it is more comfortable to wear. The outer peripheral surface of the outer skin layer 22 refers to the surface other than the end surfaces of its two ends. It can be understood that when the cross section is a regular figure (such as a rectangle, an ellipse, etc.) or an approximately regular figure, the length and width of the cross section are interpreted in their usual meanings. When the cross section is an irregular figure, unless otherwise specified, the distance between the two points farthest from the outer contour of the cross section is taken as its length, and the line connecting the corresponding two points is the length direction, the width direction is perpendicular to the length direction, and the width is the maximum size of the outer contour of the cross section along the width direction. Optionally, the length direction X1 of the middle section A of the outer skin layer 22 is perpendicular to the reference plane B, the width direction Y1 is parallel to or coincides with the reference plane B, and the length direction X2 of the end 22a of the outer skin layer 22 is not perpendicular to the reference plane B, that is, from the middle position of the outer skin layer 22 to its end 22a, the length direction of the cross section of the outer skin layer 22 changes angles to improve the overall strength of the outer skin layer 22. Optionally, the angle changes to 60°~90°, that is, the angle between the length direction X1 of the middle section A and the length direction X2 of the end 22a of the outer skin layer 22 is 60°~90°. Further optionally, the length direction X2 of the end 22a of the outer skin layer 22 is parallel to or coincident with the reference plane B, so that the length direction X1 of the middle section A of the outer skin layer 22 and the length direction X2 of the end 22a are perpendicular, and the length direction of the cross-section of the outer skin layer 22 changes at an angle of 90° from the middle position of the outer skin layer 22 to its end 22a.

[0089] The change in the length and width of the cross-section can be controlled by controlling the size of the outer skin layer 22 in different parts. For example, from the middle 22b of the outer skin layer 22 to its end 22a, the size of the outer skin layer 22 along the height direction of the earphone (the height direction of the earphone is perpendicular to the reference plane B in the illustrated embodiment) remains unchanged or gradually increases, and the size of the outer skin layer 22 in the direction perpendicular to the height direction of the earphone gradually increases, and the rate of increase is greater than the rate of increase of the size of the outer skin layer 22 along the height direction of the earphone. The closer to the end of the outer skin layer 22, the larger the size of the cross-section perpendicular to the height direction of the earphone becomes, so that the length of the end 22a of the outer skin layer 22 can become perpendicular to the length of the middle cross-section A.

[0090] It can be understood that the middle section A has the smallest cross-sectional area, the lowest strength, and is most susceptible to torsional deformation. When worn, if the middle part of the back hanging 2 is torsional deformed, the two sound units 10 will be dislocated up and down, affecting the comfort and stability of wearing. Setting the middle section A so that the length direction X1 is perpendicular to the reference plane B can effectively improve the rigidity and strength of the middle section A in the length direction X1, thereby improving the performance of resisting torsion, so that the sound unit 10 is not easy to be dislocated up and down when worn. Further, at the end of the outer skin layer 22, since its cross-sectional area is relatively larger, the ability to resist torsional deformation is better, and when the earphone is worn, at the end 22a, it is mainly subjected to the bending force along the direction of the reference plane B. Setting the length direction of the first outer end face 2d to be parallel to or coincide with the reference plane B can improve its ability to resist bending deformation in this direction and ensure the connection strength of the outer skin layer 22 and the connection position of the functional compartment 4.

[0091] It should be pointed out that although the section of the middle section A is set to be perpendicular to the reference plane B in the length direction X1, a relatively good anti-torsion effect can be obtained, it is not necessary to be perpendicular. For example, when the length direction X1 and the reference plane B are at an angle of 70° to 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 outer skin layer 22 from the middle position of the outer skin layer 22 to its end 22a is not necessarily 90°, for example, it can be 60° to 90°, so that there is a relatively small angle between the length direction of the end of the outer skin layer 22 and the reference plane B, which is conducive to improving its ability to resist bending deformation in this direction and ensuring the connection strength of the outer skin layer 22 and the functional compartment 4. At the same time, it is conducive to making the width W3 of the connector 23 larger, thereby further ensuring the connection strength between the rear hook and the functional compartment.

[0092] In order to further ensure the anti-twisting performance of the rear hanging 2 and prevent the sound unit 10 from being misplaced up and down when it is opened, optionally, the length direction of the cross section of at least the first curved portion 2b is at an angle of 70° to 90° with the reference plane B, further optionally, it is perpendicular to the reference plane B, and further optionally, the length direction of the cross section of the first curved portion 2b is consistent with the length direction of the middle cross section A.

[0093] Optional, such as Figure 8 As shown, Figure 8The schematic diagram of the end of the outer skin layer 22 observed along the plugging direction is shown. For the sake of clarity, the structure of the holes and the like of the outer skin layer 22 and the connector 23 are not shown. The ratio of the length L1 of the end of the outer skin layer 22 to the length L2 of the middle section A is in the range of 3.2 to 1.2, so that the rear hanger 2 has good structural performance as a whole. In addition, when the area of ​​the middle section A meets the requirements, for example, when it is set to a certain value, if the ratio is too large, the length L1 of the end 22a of the outer skin layer 22 and the width W 1 is too large, which will lead to the volume of the functional compartment 4 being too large, affecting the appearance, and will also increase the weight of the whole machine, resulting in changes in the center of gravity when wearing, and poor stability; if the ratio is too small, the connector 23 will be too small in size, and it will be easy to escape from the functional compartment 4. At the same time, it will also cause the wall thickness (or meat thickness, shell thickness, etc.) of the shell at the plug-in position to be too thin, and the strength is insufficient and cracking is easy to occur. The ratio range is set to 3.2~1.2, so that the ratio is more appropriate, the overall quality and size of the headset are more appropriate, and the wearing stability and comfort are better. Further optionally, the ratio of length L1 to length L2 is 3~1.9, and further can be selected as 2.7~2.2 to further ensure the effect.

[0094] Optionally, the width W2 of the middle section A is 1.6-4 mm. If the cross section is too large, the volume and weight of the back hook 2 will increase, affecting the wearing experience. If the cross section is too small, it is easy to cause leakage and skin breakage during use, and the yield rate is too low during production. Further, the width W2 of the middle section A is 1.9-3.5 mm, further 2.3-3.1 mm, and further 2.7-2.9 mm, for example, 2.7 mm, 2.8 mm or 2.9 mm, so that the width W2 of the middle section A is more appropriate.

[0095] It should be noted that the reference Figure 8 , the width W1 and length L1 of the end 22a of the outer skin 22 refer to the width and length of the outer contour of the projection of the end 22a of the outer skin 22 along the plug-in direction on a plane perpendicular to the plug-in direction. It should be pointed out that when the outer contour of an object is a regular shape (such as a rectangle, ellipse, etc.) or an approximately regular shape, the length and width of the outer contour are interpreted in their usual meanings. When the outer contour is an irregular shape, unless otherwise specified, the distance between the two points farthest from each other on the outer contour is used as its length, and the line connecting the two corresponding points is the length direction, the width direction is perpendicular to the length direction, and the width is the maximum size of the outer contour along the width direction. The plug-in direction refers to the direction when the rear hanger 2 is inserted into the functional compartment 4, which is consistent with the extension direction (or length direction) of the connector 23 and the plug-in hole 405 (see the label). Fig.10 ) have basically the same axial direction.

[0096] In some embodiments, the conductor 20 is located on the inner side relative to the elastic metal wire 21, so that the elastic metal wire 21 can provide better protection for the conductor 20. When the user bends the back hook 2 inward, the conductor 20 is not easily damaged or has poor contact due to stretching deformation. Further, optionally, the center lines of the conductor 20 and the elastic metal wire 21 at least corresponding to the first curved portion 2b are located on the same plane (specifically, the reference plane B) to further improve the effect. Further, optionally, the center lines of the conductor 20 and the elastic metal wire 21 are located on the same plane.

[0097] The elastic metal wire 21 is made of elastic material, for example, it can be a single metal, or an alloy material including multiple metal materials, such as aluminum alloy, magnesium alloy, titanium alloy, spring steel, etc., or a composite material including metal material and non-metallic material. Optionally, the material of the elastic metal wire 21 is titanium alloy, which has a strong memory function and can still return to its original state after multiple (more than ten thousand times) bending and deformation.

[0098] The average width between the two tragus of an adult is approximately 140 mm. In some embodiments, in order to take into account the stability and comfort of the user when wearing the headset, when the headset is opened to the distance D1 between the ends of the outer skin layer 22 is 140 mm, the contact force of the sound unit 10 on the facial skin is 0.22-1.33 N. When measuring the force, one of the sound units 10 of the headset can be fixed to the external device, and the surface of the other sound unit 10 used to fit the face is abutted against the force sensor, and then the force sensor is moved to push the other sound unit 10 away until the distance D1 between the two ends of the outer skin layer 22 is 140 mm. The value of the force sensor is read, which is the contact force of the sound unit 10 on the facial skin. Further optionally, the contact force is 0.4-0.8 N, and further optionally 0.5-0.7 N, 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 through parameters such as the curvature shape, diameter size, thickness of the outer layer 22 and hardness of the outer layer 22 of the elastic metal wire 21 to keep it in an appropriate range.

[0099] like Figure 3b , Fig. 9 and Fig.10 As shown, the rear hook 2 is plugged into the function compartment 4 through the connector 23. The function compartment 4 includes a housing 40, and the housing 40 is provided with a connector hole 405. The connector 23 is matched with the connector hole 405. The outer skin 22 can be coated on the outside of the connector 23, the wire 20 and the elastic metal wire 21 by injection molding to be connected and fixed with the connector 23, the wire 20 and the elastic metal wire 21. The wire 20 passes through the connector 23, and a connector 23 is connected to each end of the elastic metal wire 21.

[0100] In some embodiments, at least two non-coplanar surfaces of the outer skin layer 22 are provided to contact the outer shell 40 to increase the contact area and improve the waterproof effect. Fig.11a and Fig.11b As shown, at least one groove 24 is provided at the end 22a of the outer skin layer 22 (in the illustrated embodiment, it is also the end of the second curved portion 2c), so that in addition to forming the first outer end face 2d located on the outside, 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 face of the groove 24, and the side face of the groove 24 is a connecting face 241, which is connected between 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, the number of grooves 24 is two, 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 faces 241 are arranged in the same plane. In the figure, the depths of the two grooves 24 are different, thereby forming a step shape.

[0101] When the rear hook 2 is connected to the housing 40, the first outer end surface 2d and the second outer end surface 240 are in contact with the surface of the housing 40. Fig.10 and Fig.12 As shown, the housing 40 is provided with a first contact surface 400 for affixing with the first outer end surface 2d, a second contact surface 401 for affixing with the second outer end surface 240, and a third contact surface 402 for affixing with the connecting surface 241 of the slot 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 surfaces 240. When the rear hook 2 and the functional compartment 4 are connected, the first outer end surface 2d is affixed with the first contact surface 400, the second outer end surface 240 is affixed with the corresponding second contact surface 401, and the connecting surface 241 of the slot 24 is affixed with the third contact surface 402. The arrangement of the non-coplanar first outer end surface 2d and the second outer end surface 240 makes the total contact area between the rear hook 2 and the housing 40 larger, which can increase the sealing area of ​​the plug-in position, increase the sealing effect, make the earphone plug-in position more airtight, and can also play a positioning role through the slot 24.

[0102] like Fig.11b As shown, the first outer end face 2d and the second outer end face 240 are staggered with each other, and the staggered 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, and the staggered distance D3 can be understood as the width of the connecting surface 241 of the slot 24. If the staggered distance is too large, the plug-in position will be too long, which will affect the appearance and increase the volume and weight. If the staggered distance is too small, it is impossible to achieve a good airtight effect. Further optionally, the staggered distance D3 is 1.5 to 2.5 mm, and further can be selected as 1.7 to 2 mm, so as to further strike a balance between volume and weight and sealing effect.

[0103] In some embodiments, the first outer end surface 2d and the second outer end surface 240 are arranged in parallel. Fig.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 an angle between the two faces that is not 0. Further optional, such as Fig.11a and Fig.11b In the illustrated embodiment, the first outer end face 2d and the two second outer end faces 240 are not parallel. Optionally, the angle α3 between the first outer end face 2d and the second outer end face 240 is 10° to 60°. The angle between the first outer end face 2d and the second outer end face 240 will cause at least one of the faces to be inclined, thereby increasing the contact area and improving the sealing. When the angle α3 is too large, the plug-in position will be too long, affecting the appearance and increasing the volume and weight. When the staggered distance is too small, the improvement of the airtightness effect is not obvious. Setting the angle α3 to 10° to 60° is conducive to making the length of the plug-in position more appropriate and improving the sealing effect. Further optionally, the angle α3 is 30° to 55°, and further optionally 40° to 50°, for example, it can be 40°, 45° or 50°, to further ensure the effect.

[0104] Optionally, the first outer end face 2d is perpendicular to the plugging direction, or the end of the first outer end face 2d away from the second outer end face 240 is inclined toward the 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 toward the direction close to the functional compartment 4, so as to increase the contact area with the outer shell 40.

[0105] Optionally, the second outer end face 240 is perpendicular to the plugging direction, or the end of the second outer end face 240 away from the first outer end face 2d is inclined toward the direction close 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.

[0106] Optionally, the second outer end surface 240 and the first outer end surface 2d are both inclined relative to the plug-in direction (the plug-in direction is consistent with the length direction of the connector 23) to further increase the contact area and improve the sealing effect.

[0107] Optionally, the connection surface 241 is parallel to or coincides with the plugging direction.

[0108] It should be noted that when defining the angle and relative position between two surfaces (for example, parallel or non-parallel), the surface may be a plane or a curved surface. When the surface is a plane, the angle and relative position with the surface are the angle and relative position with the plane where the surface is located. When the surface is a curved surface, there is a tangent plane at the most convex point or the most concave point of the curved surface. At this time, the angle and relative position with the surface can be understood as the angle and relative position with the tangent plane of the surface. For example, the second outer end face 240, the first outer end face 2d, and the connecting surface 241 mentioned 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 face 240 and / or the first outer end face 2d and / or the connecting surface 241 are curved surfaces, the surface on the housing 40 that contacts them is also set to a curved surface so that the two can fit tightly. Fig.11b In the illustrated embodiment, both second outer end faces 240 are curved surfaces, and the most concave point thereof has a tangent plane 240a, the connecting surface 241 and the first outer end face 2d are planes, the angle α3 refers to the angle between the connecting surface 241 and the tangent plane 240a, and the angle α4 refers to the angle between the first outer end face 2d and the tangent plane 240a. In other embodiments, the first outer end face 2d and the second outer end face 240 may be planes, and it is understood that a plane is easier to process and has better dimensional accuracy than a curved surface, but when the contact area between the housing 40 and the outer skin layer 22 is a curved surface, the contact area is generally larger than that of a plane, which is conducive to improving the sealing effect.

[0109] It is understandable that, although the present invention takes the end 22a of the outer skin layer 22 as an example to describe two grooves 24, the end of the rear hanger 2 may be provided with one or more grooves 24 to form one or more second outer end surfaces 240 and connecting surfaces 241. Furthermore, when multiple grooves 24 are provided, the arrangement of the grooves 24 is not limited, for example, they may be arranged along the length direction of the end 22a, or along the width direction of the end 22a. Fig.11a and Fig.13a , Fig.11a and Fig.13a Some embodiments are shown with two slots 24, wherein: Fig.13a In the illustrated embodiment, the two grooves 24 are arranged along the width direction of the end portion 22a, and the grooves 24 farther away from the first outer end surface 2d are deeper, forming two second outer end surfaces 240 with different depths located on the same side of the first outer end surface 2d. Fig.11a In the illustrated embodiment, two grooves 24 are arranged along the length direction of the end portion 22a, wherein one groove 24 has a deeper depth, forming two second outer end surfaces 240 with different depths located on the same side of the first outer end surface 2d. In other embodiments, a plurality of second outer end surfaces 240 may be located on both sides of the first outer end surface 2d, Fig.13b, the number of the grooves 24 is three, wherein one side of the second outer end face 240 has two grooves 24 and the other side has one groove 24, thereby forming two first outer end faces 240 and two connecting faces 241 on one side of the second outer end face 240, and forming one first outer end face 240 and one connecting face 241 on the other side. Obviously, when there are only two second outer end faces 240, the two second outer end faces 240 can also be located on both sides of the first outer end face 240. It can be understood that when the number and position of the grooves 24 change, the position of the outer shell 40 and the end of the rear hanging 2 can be adjusted accordingly, and the two are configured to achieve matching, so that each second outer end face 240 is in contact with the outer shell 40, thereby further improving the sealing and positioning effect.

[0110] Optionally, when the end 22a of the outer skin 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 surfaces of the first outer end surface 2d and each second outer end surface 240 are arranged non-parallel, or, the surfaces of the first outer end surface 2d and each second outer end surface 240 are arranged non-parallel to each other, so as to further increase the contact area and ensure the sealing effect.

[0111] It is understandable that the contact surface between the outer skin layer 22 and the outer shell 40 can be sealed by dispensing glue to further increase the sealing effect and the connection strength between the two. Since the contact surface between the outer skin layer 22 and the outer shell 40 has a relatively larger area, the coating area of ​​the glue is increased, which increases the space for operation, and the glue can be more reliably retained between the contact surface of the outer skin layer 22 and the outer shell 40 after being squeezed through the contact surface without easily overflowing, which is conducive to ensuring a good appearance.

[0112] It can be understood that when there are multiple second outer end surfaces 240, it is not necessary for each second outer end surface 240 to be in contact with the outer shell 40. When some of the second outer end surfaces 240 are in contact with the outer shell 40, a better waterproof effect can be achieved. Of course, when all the first outer end surfaces 2d and the second outer end surfaces 240 are in contact with the outer shell 40, a better waterproof effect can be achieved.

[0113] It is understandable that, in other embodiments, the end portion 22a of the outer skin layer 22 may not be provided with the groove 24, and only one first outer end surface 2d may exist.

[0114] In some embodiments, the housing 40 has a rear end face 40a facing the side where the rear hook 2 is located, and the connector hole 405 is provided on the rear end face 40a and extends deep into the housing 40. The housing 40 of the conventional connector structure is usually provided with a tubular connecting portion 920 extending outwards for connecting with the connector 23. Fig.10In the embodiment shown, the housing 40 is not provided with a connecting portion 920 (see reference numeral 920) protruding from the rear end surface 40a. Fig.26 and Fig. 27 ), but the connector hole 405 is directly opened on the rear end face 40a. The traditional tubular connecting part 920 is usually designed to be extended and thickened according to the shape of the connector 23, and its wall thickness is relatively uniform and limited by the shape of the connector 23. Generally, the wall thickness of the connecting part 920 is set to be thinner due to the limited structural space, which is prone to cracking. By eliminating the connecting part 920, the structure of the shell 40 can be simpler, the structural strength is better, and the volume is smaller. The thickness of the shell 40 and the connector 23 at the joint is not limited by the structural space, and the thickness of the shell 40 can be directly borrowed. When the rear hanger 2 is pulled outward and subjected to force, the tensile strength of the connection position between the shell 40 and the rear hanger 2 is stronger and less prone to cracking.

[0115] Optionally, the width W3 of the connector 23 is greater than its thickness H1, and the width direction of the connector 23 is consistent with the thickness direction Y3 of the functional compartment 4 (including the case where the two are parallel or nearly parallel). In this way, the width direction of the connector 23 is relatively consistent with the direction of the pulling force on the connection position of the housing 40 and the back hook 2 when the earphone is in use. Since the width W3 of the connector 23 is relatively larger than its thickness H1, the structural strength of the connector 23 in the main force direction can be improved. Further, optionally, the width direction of the connector 23 is consistent with the length direction X2 of the end 22a of the outer skin layer 22, and the thickness direction is consistent with the width direction Y2 of the end 22a of the outer skin layer 22. The width dimension can be set larger, which is more convenient to set the wires 20 and elastic wires 21 arranged along the width direction of the connector 23. The length direction of the connector 23 is its extension direction, which is consistent with the plug-in direction.

[0116] In some embodiments, reference Fig.14 and Fig.15, the connector 23 has a flat first surface 23b. Optionally, the outer contour of the cross section of the connector 23 perpendicular to the plug-in direction is rectangular (including rectangular and approximately rectangular, for example, the four corners can be provided with bevel or rounded corners), so as to form a relatively flat first surface 23b and a second surface 23c arranged opposite thereto, and two oppositely arranged side surfaces 23a connected between the first surface 23b and the second surface 23. 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 planes, and the first surface 23b is parallel to the connecting surface 241 of the slot 24 (including parallel and nearly parallel cases), which is conducive to improving the positional dimensional accuracy of the two, facilitating the assembly process break and gap control, 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 planes, the first surface 23b and the second surface 23c are parallel, and the two side surfaces 23a are parallel.

[0117] In some embodiments, the outer peripheral surface of the connector 23 is provided with at least one boss 231 protruding outward along its radial direction (referring to the direction perpendicular to its length direction). 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 boss 231 can be used for mold molding positioning. When it is necessary to inject the outer skin layer 22 outside the connector 23, the boss 231 can be used for positioning with the mold, thereby improving the positioning accuracy, preventing misalignment and deformation, and then reliably ensuring the connection strength between 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 boss 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 boss 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 a relatively larger area, which is more conducive to the provision of the boss 231 and its positioning effect. For example, at least one boss 231 may be provided on the first surface 23b of the connector 23, and the boss 231 protrudes along the thickness direction of the connector 23. Optionally, at least a portion of the boss 231 is exposed on the outer skin layer 22 so that it can be used for positioning when the rear hook 2 is assembled with the housing 40. Fig.10 and Fig.12 As shown, a positioning groove 4020 is provided on the housing 40, and the positioning groove 4020 can be matched with the boss 231 to achieve the positioning of the connector 23 and the housing 40, so that the relative position between the outer skin layer 22 and the surfaces of the housing 40 that need to be fitted is more accurate, thereby ensuring the waterproof and sealing effect.

[0118] Optionally, the boss 231 is at least partially exposed in at least one slot 24. Fig.15 In the illustrated embodiment, the groove 24 is located above the first outer end surface 2d, and in this case, the first surface 23b is the top surface of the connector 23. In other embodiments, the groove 24 may also be arranged below the first outer end surface 2d, and in this case, the first surface 23b is the bottom surface of the connector 23.

[0119] The boss 231 may be partially exposed on the covered outer skin layer 22 or may be completely located outside the outer skin layer 22. When the boss 231 is partially exposed, it is partially covered by the outer skin layer 22, which can increase the contact area with the outer skin layer 22 and improve the connection force.

[0120] 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 to 2.5 mm. 2 If the projection area is too small, the boss 231 is not strong enough and is easily broken and cannot play a reliable positioning role. If the projection area is too large, it will increase the volume and affect the wall thickness of the shell 40 that matches it, thereby affecting the strength of the shell 40. The projection area is set to 0.5-2.5mm 2 , which is conducive to ensuring the positioning effect of the boss 231 while ensuring the structural strength of the housing 40. Further optionally, the projection area of ​​the boss 231 is 1 to 2 mm 2 , and further optional 1.4~1.7mm 2 , to further ensure the effect.

[0121] In some embodiments, Fig.14 As shown, in the width direction of the connector 23, the ratio of the length L5 of the boss 231 to the width W3 of the connector 23 is 0.2 to 1. If the ratio is too small, the boss 231 is insufficient in strength and short in length, and cannot effectively play a positioning role. If the ratio is too large, the distance between the boss 231 and the edge of the connector 23 is small, and the positioning effect of the connector 23 in the length direction is poor. Further, optionally, the ratio of the length L5 of the boss 231 to the width W3 of the connector 23 is 0.4 to 0.8, and further optionally 0.5 to 0.6, to further ensure the effect. Optionally, the boss 231 extends along the width direction of the connector 23, and its length is consistent with the width direction of the connector 23.

[0122] The connection method between the connector 23 and the functional compartment 4 can be, for example, hook connection, riveting fixation, screw fixation, etc. In some embodiments, the connector 23 and the functional compartment 4 are fixed by a locking member connection. Figures 16 to 18As shown, the head-mounted sound-emitting device further includes a stopper, which includes at least one stopper arm 50. The connector 23 is provided with a receiving portion 232 corresponding to the position and number of the stopper arm 50. The housing 40 is provided with a through hole 403 corresponding to the position and number of the stopper arm 50. The through hole 403 is connected to the connector 405. Both the through hole 403 and the receiving portion 232 are used to insert the stopper arm 50. When the stopper arm 50 is inserted into the receiving portion 232 through the through hole 403, part of the stopper arm 50 is located in the housing 40 and part of the stopper arm 50 is located in the connector 23, thereby limiting the position of the connector 23 and preventing the connector 23 from withdrawing from the connector 405. The stopper arm 50, the receiving portion 232 and the through hole 403 can also be fixed by dispensing glue to further increase the firmness of the connection and the waterproof performance.

[0123] The receiving portion 232 may be, for example, a semi-enclosed groove (eg Fig.19 As shown, it is connected to the side surface 23a), or it can be a closed hole (for example Fig.16 As shown in the figure), that is, the outer contour of the cross section of the receiving portion 232 cut along a plane perpendicular to the thickness direction of the connector 23 can be semi-closed or closed, and of course can also be other shapes that can limit the clamping arm 50. Figures 16 to 18 In the illustrated embodiment, the locking member is columnar, and it can be understood that the locking member only includes one locking arm 50. Adaptively, the connector 23 is provided with a receiving portion 232, and the housing 40 is provided with a through hole 403. The number of the locking member is not limited to one, and there may be more, for example Fig.19 and Fig. 20 In the illustrated embodiment, there are two retaining members, which are respectively located on both sides of the connector 23. Adaptively, the connector 23 is provided with two receiving portions 232, and the housing 40 is provided with two through holes 403. In addition, the retaining member is not limited to being columnar. For example, the retaining member can also be U-shaped, which includes two retaining arms 50 extending in the same direction and a connecting portion connected between the two retaining arms 50. Adaptively, the connector 23 is provided with two receiving portions 232, and the housing 40 is provided with two through holes 403. It can be understood that two retaining arms 50 can improve the firmness of the connection and the positioning effect compared to one retaining arm 50. For example, it is less likely to tear off the retaining arm 50 when pulling the rear hook 2.

[0124] Fig.19In the illustrated embodiment, there are two receiving portions 232, the axis of which is consistent with the thickness direction of the connector 23, and which are arranged at intervals along the width direction of the connector 23, and are respectively connected to the two side surfaces 23a. In this way, two clamping arms 50 can be used to limit the connector 23, and compared with the solution 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 setting two closed hole-shaped receiving portions, the reduction in the width direction of the connector 23 can be reduced, and the structural strength of the connector 23 can be ensured.

[0125] It is understandable that the receiving portion 232 may or may not penetrate the connector 23, for example, it may be a blind hole. Optionally, the receiving portion 232 penetrates the connector 23 to improve the positioning effect and facilitate processing.

[0126] Optionally, the material of the locking piece is a metal material, and can further be an alloy material, for example, it can be stainless steel (such as SUS304, SUS430), cobalt-nickel alloy, high-strength carbon steel, aluminum alloy (such as magnesium-aluminum alloy), titanium alloy, zinc alloy (such as lead-zinc alloy) or iron (here, iron refers to pig iron, that is, iron-carbon alloy), etc. Metal materials and alloy materials have good tensile strength, which is beneficial to ensure the reliability of the limiting of the locking piece and the docking plug-in 23.

[0127] Optionally, along the thickness direction of the connector 23, the ratio of the projected area of ​​all the receiving portions 232 to the connector 23 on the same plane perpendicular to the thickness direction of the connector 23 is 2% to 10%. The projected area of ​​the receiving portion 232 and the connector 23 refers to the area enclosed by the outer contours of the projected area of ​​the receiving portion 232 and the connector 23. The projected area of ​​all the receiving portions 232 is the sum of the projected areas of all the individual receiving portions 232. When calculating the projected area of ​​the receiving portion 232, if the receiving portion 232 is in the shape of an open groove, refer to Fig.21 , the two ends of its opening can be connected by a connecting line 232a to form a closed projection area, and the projection area of ​​the connector 23 includes the projection area of ​​the receiving portion 232. When the projection area of ​​the connector 23 is constant, if the ratio is too large, the receiving 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 gap of the receiving portion 232 is too small, the position of the receiving portion 232 cannot be effectively positioned, and the cross-section of the clamping arm 50 is too small, resulting in poor strength. Further optionally, the ratio of the projection area of ​​the receiving portion 232 to the connector 23 on the same plane perpendicular to the thickness direction of the connector 23 is 3% to 6%, and further optionally 3.5% to 5%, so as to further ensure the strength of the connector 23 and the clamping arm 50 and ensure the connection effect.

[0128] Optionally, when the connector 23 is limited by the retaining member, the retaining member is not exposed from the housing 40 to ensure a good appearance. Further optionally, the retaining member is located inside the housing 40 to prevent the user from easily removing the retaining member from the outside, thereby improving the reliability of the product. Fig.10 , Fig.12 , Fig.17 and Fig.18 As shown, the housing 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 seals the open end 4040. The main housing 404 includes a first housing portion 4041 disposed opposite to the cover 407, a second housing portion 4042 located between the first housing portion 4041 and the cover 407, and two third housing portions 4043 disposed opposite to each other. The first housing portion 4041, the second housing portion 4042, and the cover 407 are sequentially arranged along the height direction Z3 of the functional compartment 4 and are all connected between the two third housing portions 4043. A connector 405 is formed between the first housing portion 4041, the second housing portion 4042, and the two third housing portions 4043. The through hole 403 is provided on the second shell part 4042 and is connected to the plug-in hole 405. When the locking member is inserted into the through hole 403 to position the connector 23, it will be located inside the shell 40. When the cover 407 is installed on the shell 40, the locking member is located in the closed space formed by the main shell 404 and the cover 407. The locking member 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 part 4041, and the locking arm 50 can pass through the through hole 403 and enter the receiving hole 406, further improving the limiting effect and optimizing its force structure.

[0129] It is understandable that in other embodiments, the locking member may also be exposed from the housing 40. The through hole 403 is not limited to being disposed on the second shell portion 4042, and may also be disposed on the first shell portion 4041 or the third shell portion 4043, for example. However, since the first surface 23b and the second surface 23c of the connector 23 have relatively large areas and more sufficient space, it is preferred that the receiving portion 232 is disposed on the first surface 23b and / or the second surface 23c, and correspondingly, the through hole 403 may be disposed on the first shell portion 4041 or the second shell portion 4042.

[0130] Optionally, in some embodiments, when the connector 23 is limited by two or more than two clamping arms 50, the clamping arms 50 are arranged at intervals along the length direction of the connector 23. In other embodiments, such as Fig.19 As shown, the clamping arms 50 are arranged at intervals along the width direction of the connector 23 to save space in the plugging direction.

[0131] Optionally, the axis direction of the clamp arm 50 and the through hole 403 is perpendicular to the plugging direction of the connector 23, so as to facilitate processing and assembly and achieve a better limiting effect.

[0132] Compared with hook connection, pin riveting and screw fixing, the method of connecting with the retaining piece has many advantages. For example, when connected by hook, the material of the connector 23 is generally PA material, which is easy to absorb moisture and expand, causing cracks in the opponent (i.e., the housing 40). In order to improve the waterproof performance, a sealing ring is usually required on the outside of the connector 23. The structure of the connector 23 is more complicated, which increases the process and cost. In addition, the structure of the hook tends to increase the volume of the functional compartment, which is not conducive to the miniaturization of the functional compartment. For another example, after the pin is riveted, there are traces of the combination of the pin and the plastic on the outside, and a layer of elastic material such as silicone needs to be coated on the outside, which increases the process and cost. For another example, the structural space required for screw fixing is relatively large, which does not conform to the lightweight design of the bone conduction headset.

[0133] By connecting with the stopper, the connector 23 can be effectively positioned and fixed. At the same time, the structure is relatively simple and occupies little space, which is conducive to reducing costs, realizing the lightweight design of the bone conduction headset, and improving the aesthetics of the appearance. Further, combined with the multi-faceted contact sealing method described above, the sealing performance of the connection between the rear hanger 2 and the functional compartment 4 can be reliably guaranteed.

[0134] The connector 23 may be made of a high-strength material with good tensile strength and yield strength, such as PA (polyamide), PA+GF (composite material of polyacrylamide and glass fiber) or metal. Although PA and PA+GF materials can meet the high-strength requirements, their moisture absorption and expansion will crack the shell components assembled with them, affecting the reliability of use. Therefore, the earphone can be used in a relatively dry environment.

[0135] Optionally, the connector 23 is made of metal material, and can further be made of alloy material, such as aluminum alloy (such as magnesium aluminum alloy), zinc alloy or magnesium alloy. Compared with PA and PA+GF, alloy material has higher tensile strength and smaller volume, so that the volume of the functional compartment 4 can be further reduced, thereby further realizing a lightweight design. Moreover, the alloy material will not absorb moisture and expand, and has better reliability and durability. For example, zinc alloy in metal material has a smaller density (6.75g / cm 3 ) and higher tensile strength. Under the same strength, the volume can be made smaller, the thickness of the corresponding position of the shell 40 and the connector 23 is larger, the strength is enhanced, it is not easy to crack, the reliability is better, and the volume of the shell 40 can also be made smaller.

[0136] In some embodiments, the connector 23 is made of metal material, such as Fig.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 decreases, the assembly air tightness deteriorates, and the waterproof effect deteriorates; if the ratio is too small, the connector 23 becomes smaller, the strength is insufficient, the effect of the connector 23 covering the elastic metal wire 21 deteriorates, and the connector 23 is easy to fall off the elastic metal wire 21. Further optionally, 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 further optionally 0.55-0.65, to further ensure the effect, so that the size of the connector 23 and the size of the end of the outer skin layer 22 are more reasonable.

[0137] The outer skin layer 22 has a first outer end point O1 which is the outermost in the length direction of its end 22a. 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 first outer end point O1 of the connector 23 and the outer skin layer 22 is 0.8-2 mm. When the outer dimensions of the end 22a of the outer skin layer 22 are constant, if the distance D4 is too large, the outer dimensions of the connector 23 in the width direction will be too small, the overall strength will be poor, and it will be easy to fall off the elastic metal wire 21; if the distance D4 is too small, the outer dimensions of the connector 23 in the width direction will be too large, which will affect the area of ​​the left and right sides of the rear hanging 2 that contact the shell 40, and the assembly sealing will be poor. Further optionally, the distance D4 is 1-1.6 mm, and further optionally 1.1-1.3 mm, so that the size of the connector 23 and the rear hanging 2 is more appropriate, further ensuring the firmness of the connection between 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.

[0138] Furthermore, the position of the connector 23 relative to the outer skin 22 in the thickness direction will also affect the firmness of the connection between the connector 23 and the outer skin 22 and the waterproof effect after the rear hanger 2 is connected to the functional compartment 4. Fig.14As shown, the outer skin layer 22 has a second outer end point O2 at the outermost side in the width direction of its end 22a. In the thickness direction of the connector 23, the distance D5 between the connector 23 and the second outer end point O2 of the outer skin layer 22 is 0.8-2 mm. The distance D5 refers to the distance between the first surface 23b and the second surface 23c of the connector 23 and the corresponding second outer end point O2, without considering the boss or similar structure set on the surface. Similarly, when the outer dimensions of the end of the rear hanger 2 are constant, if the distance D5 is too large, the outer dimensions of the connector 23 in the thickness direction will be too small, the overall strength will be poor, and it will be easy to fall off the elastic metal wire 21; if the distance D5 is too small, the outer dimensions of the connector 23 in the thickness direction will be too large, which will affect the area of ​​the upper and lower sides of the rear hanger 2 in contact with the housing 40, and the assembly sealing will be poor. Further optionally, the distance D5 is 1 to 1.6 mm, and further optionally 1.1 to 1.3 mm, so that the sizes of the connector 23 and the rear hanger 2 are more appropriate, further ensuring the firmness of the connection between the connector 23 and the outer layer 22 and the waterproof effect after the rear hanger 2 is connected to the functional compartment 4.

[0139] It is understandable that the connector 23 is not connected to the outer peripheral surface of the outer skin layer 22, and is not exposed from the outer peripheral surface of the outer skin layer 22, so that the surface of the end 22a surrounding the outer side of the connector 23 can contact the housing 40 to achieve a good sealing effect and ensure the connection effect between the outer skin layer 22 and the connector 23. Optionally, the connector 23 is centered relative to the end 22a of the outer skin layer 22 to ensure a more consistent sealing effect around it. In some embodiments, the ratio of the distance D4 to the distance D5 ranges from 0.9 to 1.1, so that the connector 23 has an outer skin layer 22 with a thickness close to that in the width direction and the thickness direction, so that the connector 23 can be more firmly wrapped in the outer skin layer 22. Further optionally, the ratio of the distance D4 to the distance D5 is 1. At this time, the connector 23 has an outer skin layer 22 with the same thickness in the width direction and the thickness direction, further ensuring the reliability of the connection between the outer skin layer 22 and the connector 23.

[0140] In some embodiments, along the length direction of the connector 23, the ratio of the projection area of ​​the connector 23 and the end 22a of the outer skin layer 22 on the same plane perpendicular to the length direction of the connector 23 is 0.2 to 0.7. The projection area refers to the area formed by the outer contour of the projection area of ​​the connector 23 and the outer skin layer 22 on the same plane. When the outer dimensions of the end of the outer skin layer 22 are constant, if the ratio is too large, the thickness of the part coated on the outside of the connector 23 will be thinner, the coating force will be poor, and the connector 23 will be easy to leak out; if the ratio is too small, the connector 23 will be small in size, weak in strength, and easy to break due to external force. Setting the ratio to 0.2 to 0.7 is conducive to ensuring the structural strength of the connector 23 while ensuring the connection strength between the connector 23 and the outer skin layer 22. Further optionally, the ratio of the projection areas of the ends of the connector 23 and the outer skin 22 on the same plane perpendicular to the length direction of the connector 23 is 0.25 to 0.5, and further can be 0.3 to 0.4 to further ensure the effect.

[0141] It can be understood that compared with the traditional plastic connector, the connector 23 made of metal material usually has a smaller volume. Therefore, the distance D4 and the distance D5 of the connector 23 made of metal material can be made relatively larger, and the ratio of the width W3 to the length L1 of the end of the outer skin layer 22 and the ratio of the projected area of ​​the connector 23 and the end 22a of the outer skin layer 22 can all be made relatively smaller, so that the connection strength between the connector 23 and the outer skin layer 22 is better and it is not easy to separate from the outer skin layer 22.

[0142] like Fig.12 and Fig.15As shown, the outer skin 22 covers part of the connector 23, and the connector 23 has an inner end located inside the outer skin 22 and an outer end located outside the outer skin 22. Optionally, the ratio of the length L4 of the portion of the connector 23 exposed from the outer skin 22 to the length L5 of the portion of the connector 23 located inside the outer skin 22 is 0.9-1.8. When the length L6 of the connector 23 remains unchanged, if the distance ratio is too large, the length L5 will be too short, and the connector 23 will easily fall off from the outer skin 22; if the distance ratio is too small, the length L4 will be too short, the length of the plug-in position of the connector 23 will be too short, the strength of the plug-in position will be insufficient, and the rear hook 2 will easily fall off from the shell 40. Setting the ratio of the length L4 to the length L5 to 0.9-1.8 can make the connection length of the connector 23 with the outer skin 22 and the connection length with the shell 40 more appropriate, which is beneficial to ensure the reliability of the connection between the connector 23 and the outer skin 22 and the shell 40. The length L4 of the portion of the connector 23 exposed from the outer skin layer 22 refers to the dimension of the portion of the connector 23 exposed to the outside along the length direction of the connector 23. Even if only a portion of the exposed portion (for example, the upper surface is exposed and the lower surface is not exposed) is calculated within the length dimension. The length L5 of the portion of the connector 23 located 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 portion of the connector 23 exposed from the outer skin layer 22 is greater than the length L5 of the portion of the connector 23 located inside the outer skin layer 22, so as to further ensure the effective length of the connector 23 connected to the housing 40 at the plug-in position, and ensure the strength and stability of the connection. Further optionally, the ratio of the length L4 to the length L5 is 1 to 1.6, and further optionally 1.2 to 1.4, so as to further ensure the reliability of the connection between the connector 23 and the outer skin layer 22 and the housing 40.

[0143] In order to further improve the reliability of the connection between the connector 23 and the outer skin 22, as shown in FIG. Fig.16 As shown, the portion of the connector 23 located in 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 between the outer skin layer 22 and the connector 23, thereby improving the reliability of the connection between the connector 23 and the outer skin layer 22. The number of the first groove 233 can be one or more. Fig.16In the illustrated embodiment, a side surface 23a in the width direction of the connector 23 is provided with a convex rib 235 extending in the length direction, and 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 in the width direction of the connector 23 to form four first grooves 233, and optionally, the two ribs 235 on both sides are symmetrically arranged. Optionally, the surface of the rib 235 is flush with the side surface 23a.

[0144] Further optionally, a convex strip 236 protruding radially outward is provided on the outer peripheral surface of the connector 23, and the convex strip 236 is located inside the outer skin layer 22. The convex 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 beneficial to prevent the connector 23 from being torn off the outer skin layer 22, and further improve the firmness of the connection between the connector 23 and the outer skin layer 22. Fig.16 In the illustrated embodiment, the convex strip 236 and the boss 231 are disposed on the same surface (specifically, the first surface 23b) of the connector 23, and extend along the width direction of the connector 23. In other embodiments, the convex strip 236 may also be disposed on the second surface 23c or the side surface 23a. It is understood that the width of the connector 23 is larger than the thickness. Therefore, disposing the convex strip 236 on the first surface 23b or the second surface 23c may make the convex strip 236 have a larger size, thereby improving the connection effect. Optionally, the convex strip 236 extends along the width direction of the connector 23.

[0145] In order to further improve the connection effect of the convex strip 236, optionally, along the length direction of the connector 23, the shortest distance between the boss 236 and the surface of the end of the outer skin layer 22 is not less than 0.6 mm, so that the outer skin layer 22 covering the front of the boss 236 has a relatively thicker thickness, and the blocking effect of the connector 23 is better, making it less likely for the connector 23 to separate from the outer skin layer 22 along the length direction. Fig.12 As shown, optionally, the distance L9 between the convex strip 236 and the boss 231 is 2-5 mm, so that the distance between the boss 231 and the convex strip 236 is thicker than the outer skin layer 22, further ensuring the connection strength. Fig.12 In the illustrated embodiment, the convex strip 236 is flush with the end surface of the connector 23 located inside the outer skin 22 .

[0146] It is understandable that by providing the first groove 233 and / or the convex strip 236 and other structures on the connector 23, the connection strength between the connector 23 and the outer skin layer 22 can be effectively improved, and even if the length L5 of the portion of the connector 23 located inside the outer skin layer 22 is shortened, a good connection effect can be ensured. In particular, when the connector 23 is made of metal material, since its volume may be relatively smaller, the contact area with the outer skin layer 22 is also smaller. By providing the above structure, it is helpful to better ensure the connection strength between the outer skin layer 22 and the connector 23.

[0147] In some embodiments, Fig.15 , Fig.16 and Fig.21 As shown, guide surfaces 2370 are provided on both sides of the width direction of the outer end of the connector 23. The two guide surfaces 2370 form a cone shape with a small outer side and a large inner side, so as to guide the connector 23 when it is inserted into the connector hole 405. The guide surfaces 2370 can be, for example, an inclined surface or a curved surface. The outer end of the connector 23 refers to the end of the part located outside the outer skin layer 22, and the inner end refers to the end of the part located inside the outer skin layer 22. Fig.16 In the embodiment, the convex strip 236 is arranged on the inner end portion.

[0148] In some embodiments, a second groove 238 is provided on one or both sides of the outer end portion of the connector 23 in the width direction (consistent with the width direction of the connector 23). Fig.15 and Fig.16 In the embodiment shown, only one side of the end of the connector 23 is provided with the second groove 238. In other embodiments, the second groove 238 may be provided on both sides. An outwardly protruding positioning protrusion (not shown) adapted to 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 is matched with 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 outer skin layer 22 can be accurately aligned and contacted, improving the sealing effect and the consistency of the overall assembly appearance difference, which refers to the misalignment difference formed by the rear hanger 2 and the housing 40.

[0149] The number of the second grooves 238 is not limited. For example, in some embodiments, a guide rib similar to the rib 235 can be provided on one or both sides of the width direction of the outer end of the connector 23 (not shown in the figure). The guide rib is convex and extends along the plug-in 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 adapted to the guide rib is provided in the plug-in hole 405, thereby further achieving a positioning effect. Optionally, the outer surface of the guide rib is flush with the side surface 23a.

[0150] Optional, reference Fig.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, the length L8 of the second groove 238 is 0.6-1 mm, and further can be 0.7-0.9 mm, so as to further ensure the positioning effect. The length of the second groove 238 refers to its dimension along the length direction of the connector 23.

[0151] The number of the second grooves 238 is not limited to four, and may be, for example, 1 to 4, or more. Optionally, the number of the second grooves 238 may be adjusted by changing the number and position of the guide ribs.

[0152] The wire 20 passes through the connector 23 to enter the functional compartment 4. In some embodiments, as shown in FIG. Fig.15 , Fig.16 and Fig. 22 As shown, the connector 23 is provided with a receiving groove 239 extending along its length direction and passing through both ends of the connector 23. The receiving groove 239 is opened from the outer peripheral surface of the connector 23 at the same time, that is, the receiving groove 239 is connected to the outer peripheral surface of the connector 23 at the same time. The receiving groove 239 is used to accommodate the wire 20 so that the wire 20 can pass from the outer skin layer 22 into the functional compartment 4. At the same time, the receiving groove 239 can limit the wire 20 to ensure the position accuracy of the connector 23 and the wire 20 when the outer skin layer 22 is molded. Optionally, the outer layer 22 also includes a covering portion 220 extending into the receiving groove 239 and covering a portion 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, and can press the wire 20 to increase the overall sealing effect, thereby making the headset more waterproof. At the same time, the covering portion 220 embedded in the connector 23 increases the contact area with the connector 23, so that the connection strength between the connector 23 and the outer layer 22 is better, which can reduce the risk of the outer layer 22 peeling off or falling off from the connector 23. Optionally, the covering portion 220 is flush with the outer peripheral surface of the connector 23. Specifically, the surface 220a of the covering portion 220 exposed to the connector 23 is flush with the outer peripheral surface (the second surface 23c in the figure) of the connector 23 where the receiving groove 239 is set, which is conducive to simplifying the mold, so that the parting surface of the connector 23 and the outer skin layer 22 mold are in the same plane, which greatly reduces the possibility of glue overflow of the outer skin layer 22 material, and makes the seal between the outer skin layer 22 and the connector 23 better to prevent water from penetrating, thereby 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 the end surface 23d of the outer end of the connector 23 or is recessed into the end surface 23d of the connector 23, so that the covering portion 220 does not affect the matching with the connector 405.

[0153] The receiving groove 239 may 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 receiving groove 239 may be opened from the first surface 23b or the second surface 23c of the connector 23. Further, when the first surface 23b is provided with a structure such as a boss 231 or a convex strip 236, it may be exposed from the second surface 23c so that the boss 231 and the convex strip 236 have appropriate sizes to ensure the respective functions of the boss 231 and the convex strip 236.

[0154] The depth H2 of the receiving groove 239 is greater than the diameter of the wire 20. Optionally, on a cross section perpendicular to the length direction of the connector 23, the covering portion 220 covers part of the surface of the wire 20, that is, the covering portion 220 is half-surrounded outside the wire 20 instead of fully surrounded, which can save space in the thickness direction of the connector 23 while ensuring the sealing effect, thereby facilitating miniaturization. Further, optionally, 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 wire 20 to ensure the sealing effect. It is understandable that in other embodiments, the covering portion 220 can also fully surround the outside of the wire 20 to further enhance the waterproof performance.

[0155] It is understandable that when the connector 23 is made of metal material, it can generally have a smaller volume than traditional plastic materials. In some embodiments, the connector 23 is made of metal material and has a volume range of 20 to 80 mm. 3 The volume of the connector 23 can be calculated by multiplying the length L6 (referring to the maximum distance between the two end surfaces along the length direction of the connector 23), the width W3 (referring to the maximum distance between the two side surfaces along the width direction of the connector 23) and the thickness H1 (referring to the maximum distance between the first surface 23b and the second surface 23c of the connector 23 along the thickness direction of the connector 23). The protruding features such as the boss 231 and the convex strip 236 usually have a very 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. Therefore, the volume of the connector 23 is not included in the calculation. If the volume of the connector 23 is too large, the weight increases, and the outer skin layer 22 covering the outside of the connector 23 becomes thinner, and the connector 23 is easy to leak out of the outer skin layer 22; if the volume of the connector 23 is too small, it is easy to cause the overall strength of the connector 23 to be insufficient and easy to break. The volume range of the connector 23 is set to 20-80 mm 3 , which is conducive to ensuring the covering effect of the outer skin layer 22 and the structural strength of the connector 23. Further optionally, the volume of the connector 23 is 30-70mm 3, further optional 40 ~ 50mm 3 , to further ensure the effect.

[0156] In some embodiments, the connector 23 is made of metal material, and its mass range is 1.5 to 5g. If the mass is too heavy, the weight of the headset will increase, affecting the wearing comfort. If the mass is too light, the overall strength of the connector 23 will deteriorate, which is not conducive to reliable connection. Setting the mass range to 1.5 to 5g is conducive to making the connector 23 have a suitable mass and ensuring the reliability of the connection. Further optionally, the mass of the connector 23 is 2 to 4g, and further optionally 2.5 to 3.5g, to further ensure the effect.

[0157] In some embodiments, the ratio of the mass of the connector 23 (referring to a single connector 23) to the mass of the back hanger 2 is 0.2-0.4. If the ratio is too large, the mass of the connector 23 is too heavy, which will increase the weight of the entire headset and affect the wearing comfort; if the ratio is too small, the connector 23 is too light, and its overall strength will deteriorate, which is not conducive to the reliability of the connection. The ratio of the mass of the connector 23 to the back hanger 2 is 0.2-0.4. By controlling the mass of the connector 23 and the weight of the entire back hanger 2, the center of gravity of the back hanger 2 is more suitable, the wearing comfort is better, and it is also conducive to ensuring the strength of the connector 23. Further optionally, the ratio of the mass of the connector 23 to the back hanger 2 is 0.25-0.35, and further optionally 0.27-0.33, to further ensure the effect.

[0158] The elastic metal wire 21 is connected to the connector 23, and is inserted into the connector 23 and fixed to the connector 23. For example, a connection hole 234 extending along the length direction of the connector 23 may be provided on the connector 23, and the elastic metal wire 21 is inserted into the connection hole 234. In some embodiments, along the length direction of the connector 23, the ratio of the projection area of ​​the elastic metal wire 21 to the projection area of ​​the connector 23 on the same plane perpendicular to the length direction of the connector 23 is 5% to 20%. When the ratio is too large, the elastic metal wire 21 is too thick, the clamping force is large, the wearing experience is more painful, and the thickness of the connector 23 covering the outside of the elastic metal wire 21 is thin and easy to break; when the ratio is too small, the elastic metal wire 21 is thin and easy to break, and the wearing clamping force is insufficient and easy to fall off. Further optionally, the ratio of the projected areas of the elastic metal wire 21 and the connector 23 on the same plane perpendicular to the length direction of the connector 23 is 7% to 13%, and further optionally 9% to 12%, so that the thickness of the elastic metal wire 21 is more appropriate, ensuring that the clamping force is at an appropriate size and making the connection between the connector 23 and the elastic metal wire 21 more reliable.

[0159] In some embodiments, the end of the elastic wire 21 does not protrude from the end surface 23d of the outer end of the connector 23. In other embodiments, such as Fig.23 and Fig.24 As shown, the end of the elastic metal wire 21 protrudes from the end face 23d of the connector 23. During the production 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 the dimensional accuracy. Optionally, the length L7 of the elastic metal wire 21 protruding from the end face 23d of the connector 23 is 0.5-2mm. When the length L7 is too long, during the production process, the elastic metal wire 21 itself is twisted and has poor directness, making it difficult to put it 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 mold positioning groove is small, and it is easy to pop out, which is not conducive to mold positioning; further optionally, the length L7 is 0.6-1.2mm, and further optionally 0.7-0.9mm, so that the elastic metal wire 21 can play a good mold positioning effect.

[0160] 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 while the connector 23 is formed, and the connector 23 is directly formed on the elastic metal wire 21 by an embedded injection molding process. For example, when the connector 23 is made of metal material, the embedded injection molding process can be die casting, and when the connector 23 is made of plastic material, the embedded injection molding process can be injection molding.

[0161] After the connector 23 and the elastic wire 21 are connected and formed, the wire 20 is passed through the connector 23. In some embodiments, the receiving groove 239 runs through both ends of the connector 23 in the length direction, making it more convenient to pass the wire 20. Fig.25 The connector 23 also includes a threading hole 23e communicating with the receiving groove 239. The cross section of the threading hole 23e is a closed hole, for example, a circle adapted to the wire 20. Compared with the structure in which the connector 23 is provided with threading holes 23e communicating with both ends of the length direction for threading the wire 20, in the structure in which the receiving groove 239 and the threading hole 23e are combined, the length of the threading hole 23e is relatively short, which is more convenient 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 section for threading the wire, thereby further facilitating the threading of the wire 20. Optionally, the threading hole 23e is coaxially arranged with the receiving groove 239 (including the case of being nearly coaxial).

[0162] The cross-sectional shape of the portion of the elastic metal wire 21 located in the connector 23 can be circular or flat, and the flat shape includes but is not limited to a rectangular or elliptical shape, etc. The design of the shape can be determined according to the bonding force between the connector 23 and the elastic metal wire 21. When the bonding force is sufficient, the portion of the elastic metal wire 21 located in the connector 23 can be a circular cross-sectional shape, which has good strength, does not require additional processing, and has a relatively low cost. When the bonding force is insufficient, in order to improve the firmness of the connection between the elastic metal wire 21 and the connector 23, at least part of the cross-sectional shape of the portion of the elastic metal wire 21 located in the connector 23 can be set to be flat to increase the firmness of the bonding.

[0163] It should be noted that, in the absence of conflict, the various embodiments in this document can be combined with each other to obtain more implementation plans.

[0164] The above are only specific embodiments of the present invention, and any other improvements made based on the concept of the present invention are considered to be within the protection scope of the present invention.

Claims

1. A rear hanging, characterized in that: include: Wire (20); Elastic metal wire (21); an outer skin layer (22) covering the outside of the conductive wire (20) and the elastic metal wire (21); and A connector (23) is arranged at an end (22a) of the outer skin layer (22), the connector (23) is made of a metal material, and the outer skin layer (22) covers a portion of the connector (23); Along the length direction of the connector (23), the ratio of the projection areas of the connector (23) and the end (22a) of the outer skin layer (22) on the same plane perpendicular to the length direction of the connector (23) is 0.2 to 0.

7.

2. The rear suspension according to claim 1, characterized in that: The ratio of the projection areas of the connector (23) and the end (22a) of the outer skin layer (22) on the same plane perpendicular to the length direction of the connector (23) is 0.25 to 0.

5.

3. The rear suspension according to claim 2, characterized in that: The ratio of the projection areas of the connector (23) and the end (22a) of the outer skin layer (22) on the same plane perpendicular to the length direction of the connector (23) is 0.3 to 0.

4.

4. The rear suspension according to claim 1, characterized in that: The width direction of the connector (23) is consistent with the length direction X2 of the end (22a) 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 to 0.

8.

5. The rear suspension according to claim 4, characterized in that: 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 to 0.

7.

6. The rear suspension according to claim 5, characterized in that: The ratio of the width W3 of the connector (23) to the length L1 of the end of the outer skin layer (22) is 0.55 to 0.

65.

7. The rear suspension according to claim 1, characterized in that: The outer skin layer (22) has a first outer end point O1 which is the outermost in the length direction of its end (22a), and in the width direction of the connector (23), there is a distance D4 between the connector (23) and the first outer end point O1 of the outer skin layer (22). The outer skin layer (22) has a second outer end point O2 which is the outermost in the width direction of its end (22a), and in the thickness direction of the connector (23), there is a distance D5 between the connector (23) and the second outer end point O2 of the outer skin layer (22), and the ratio of the distance D4 to the distance D5 is 0.9 to 1.

1.

8. The rear suspension according to claim 1, characterized in that: The outer skin layer (22) has a first outer end point O1 which is the outermost in the length direction of its end (22a), and in the width direction of the connector (23), a distance D4 between the connector (23) and the first outer end point O1 of the outer skin layer (22) is 0.8 to 2 mm.

9. The rear suspension according to claim 8, characterized in that: The distance D4 is 1 to 1.6 mm.

10. The rear suspension according to claim 9, characterized in that: The distance D4 is 1.1-1.3 mm.

11. The rear suspension according to claim 1, characterized in that: The outer skin layer (22) has a second outer end point O2 which is the outermost in the width direction of its end portion (22a), and in the thickness direction of the connector (23), a distance D5 between the connector (23) and the second outer end point O2 of the outer skin layer (22) is 0.8 to 2 mm.

12. The rear suspension according to claim 11, characterized in that: The distance D5 is 1 to 1.6 mm.

13. The rear suspension according to claim 12, characterized in that: The distance D5 is 1.1-1.3 mm.

14. The rear suspension according to any one of claims 1 to 13, characterized in that: The width of the connector (23) is greater than its thickness, and the width direction of the connector (23) is consistent with the length direction of the end (22a) of the outer skin layer (22), and the thickness direction of the connector (23) is consistent with the width direction of the end (22a) of the outer skin layer (22).

15. The rear suspension according to any one of claims 1 to 13, characterized in that: The ratio of the length L4 of the portion of the connector (23) exposed outside the outer skin layer (22) to the length L5 of the portion of the connector (23) located inside the outer skin layer (22) is 0.9 to 1.

8.

16. The rear suspension according to claim 15, characterized in that: The ratio of the length L4 to the length L5 is 1 to 1.

6.

17. The rear suspension according to claim 16, characterized in that: The ratio of the length L4 to the length L5 is 1.2 to 1.

4.

18. The rear suspension according to any one of claims 1 to 13, characterized in that: The outer peripheral surface of the connector (23) is provided with a convex strip (236) protruding outward along its radial direction, and the convex strip (236) is located inside the outer skin layer (22).

19. The rear suspension according to claim 18, characterized in that: The connector (23) comprises a first surface (23b) and a second surface (23c) located at two ends in the thickness direction of the connector (23); the width of the connector (23) is greater than its thickness; the convex strip (236) is arranged on the first surface (23b) or the second surface (23c) and extends along the width direction of the connector (23).

20. The rear suspension according to claim 18, characterized in that: Along the length direction of the connector (23), the distance between the protruding strip (236) and the surface of the end of the outer skin layer (22) is not less than 0.6 mm.

21. The rear suspension according to claim 20, characterized in that: The connector (23) further comprises a boss (231) provided on the same surface as the convex strip (236); the boss (231) and the convex strip (236) are arranged at intervals along the length direction of the connector (23); and a distance L9 between the boss (231) and the convex strip (236) is 2 to 5 mm.

22. The rear suspension according to claim 18, characterized in that: The convex strip (236) is flush with the end surface of the connector (23) located inside the outer skin layer (22).

23. The rear suspension according to any one of claims 1 to 13, characterized in that: The part of the connector (23) located inside the outer skin layer (22) is provided with at least one first groove (233), and the outer skin layer (22) is partially filled in the first groove (233).

24. The rear suspension according to claim 23, characterized in that: The connector (23) comprises two side surfaces (23a) located on both sides in the width direction thereof, one or both of the two side surfaces (23a) are provided with ribs (235) extending along the length direction of the connector (23), and the first groove (233) is formed on both sides of the ribs (235) along the thickness direction of the connector (23).

25. A head-mounted sound device, characterized in that: include: The rear suspension (2) according to any one of claims 1 to 24; Two sound generating units (10); Two functional compartments (4), the functional compartments (4) being used to accommodate a control circuit board and / or a battery, the rear hanger (2) being connected between the two functional compartments (4), the functional compartment (4) comprising a housing (40), the connector (23) of the rear hanger (2) being plugged into the housing (40); and, An ear hook (3), wherein the sound-emitting unit (10) and the functional compartment (4) are connected via the ear hook (3).

26. The head mounted sound generating device according to claim 25, wherein: The width direction of the connector (23) is consistent with the thickness direction of the housing (40).

27. The head mounted sound generating device according to claim 25 or 26, characterized in that: It also includes a locking member (5), wherein part of the locking member (5) is located in the housing (40) and part of it is located in the connector (23), so as to limit the position of the connector (23) relative to the housing (40).

Images