Head-mounted sound production equipment

Abstract

The utility model discloses head-mounted sound production equipment, which relates to the technical field of sound production devices and comprises rear hangers which are symmetrically arranged relative to a symmetric plane. The rear hanger comprises a wire, an elastic metal wire and an outer skin layer wrapping the wire and the elastic metal wire. The outer skin layer comprises a first bent part and two second bent parts located at the two ends of the first bent part respectively, the first bent part is in an arc shape, and the second bent parts are in a curve shape bent towards the symmetry plane. According to the utility model, the first bending part of the rear hanger is arc-shaped, and the arc curvature is uniform, so that when a user wears the earphone, each point in the first bending part is uniformly stressed, the clamping force applied to the left ear and the right ear is more uniform and consistent, and the rear hanger is not easy to break due to overlarge curvature change to generate break points.

Description

Technical Field

[0001] The utility model relates to the technical field of sound-generating devices, in particular to a head-mounted sound-generating device. Background Art

[0002] Head-mounted sound-producing devices, such as headphones, all include sound-producing devices that can produce sound. According to the different sound transmission methods, sound-producing devices can be divided into bone conduction sound-producing devices and air conduction sound-producing devices. Headphones containing bone conduction sound-producing devices are usually called bone conduction headphones.

[0003] A known headphone 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 compartments and the headphone heads. There are two ear hooks. When the headphones are worn, the ear hooks are attached to the ears, while the back hooks wrap around the back of the head. The functional compartments may contain a control circuit board and / or batteries. Typically, one functional compartment primarily houses the control circuit board (often called the control compartment), and the other functional compartment primarily stores the batteries (often called the battery compartment).

[0004] Headphones can not only be used as office and entertainment products, but can also be used during exercise, such as when running. Some bone conduction headphones with good waterproof performance can even be used when swimming.

[0005] Although headphone products have become increasingly mature, there is still some room for improvement. For example, when using headphones during exercise, if the headphones are not worn firmly enough, they are prone to shaking up and down, affecting the user experience and listening experience, and may even fall off.

[0006] For example, if the back strap is poorly designed, it can easily break in some situations (such as when bending the back strap), preventing it from returning to its original shape and causing permanent deformation, which can affect the normal use of the headphones. Furthermore, the outer layer of some headphone back straps can even crack when bent significantly, affecting their appearance and reliability.

[0007] For example, the anti-torsion 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.

[0008] In addition, when used in a humid environment (such as swimming or rainy days), the waterproof performance of the earphones is required to be higher. The back hanging and the function compartment of some earphones are connected by a plug-in structure. If water leakage occurs easily at the plug-in part, it will also affect the reliability of the earphones.

[0009] like Figure 25 and Figure 26 As shown, Figure 25 and Figure 26The diagram shows the plug-in structure of the back hook and the function compartment of some headphones. 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:

[0010] 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 will be insufficient and it will easily 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 related plastic parts cannot be made 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. As the functions of the earphones gradually increase, certain components will inevitably be added. If the volume of the functional compartment is too large, it will cause discomfort when wearing.

[0011] 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 generate 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. In addition, it is very difficult to repair after failure, which will also increase after-sales costs.

[0012] 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 relatively small area, resulting in a poor appearance.

[0013] Fourth, the connection strength between the connector 91 of some earphones and the outer skin 22 is insufficient, which may cause the connector 91 to peel off or fall off from the outer skin 22.

[0014] In short, there is still room for improvement in terms of wearing comfort, structural reliability and waterproof performance of headphones.

[0015] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Utility Model Content

[0016] The purpose of the present invention is to provide a head-mounted sound-generating device to solve at least one problem existing in the prior art.

[0017] To achieve the above-mentioned purpose of the utility model, the utility model provides a head-mounted sound-generating device, comprising a rear hanger, wherein the rear hanger is symmetrically arranged with respect to a symmetric plane;

[0018] The rear hanging includes a conductive wire, an elastic metal wire, and an outer layer covering the conductive wire and the elastic metal wire;

[0019] The outer skin layer includes a first curved portion and two second curved portions located at both ends of the first curved portion, the first curved portion is in an arc shape, and the second curved portion is in a curve shape bent toward the symmetry plane.

[0020] Compared with the prior art, the present invention has the following beneficial effects: in the present invention, the back hook includes a wire, an elastic metal wire, and an outer layer wrapped around the wire and the elastic metal wire. The outer layer includes a first curved portion and two second curved portions located at both ends of the first curved portion. The first curved portion is arc-shaped with a uniform arc curvature. When the user wears the earphones, each point in the first curved portion is subjected to uniform force, and the clamping force on the left and right ears is more uniform. The back hook is not prone to breaking due to excessive changes in curvature, which may cause a folding point (fixed force point). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a stereoscopic schematic diagram of a head-mounted sound device according to some embodiments of this specification.

[0022] Figure 2 This is a schematic diagram of a sound unit of a head-mounted sound device according to some embodiments of this specification.

[0023] Figure 3a It is a three-dimensional schematic diagram of a rear hanging according to some embodiments of the present specification.

[0024] Figure 3b yes Figure 3a Exploded view of the rear pylon shown.

[0025] Figure 4a yes Figure 1 A top view of the head mounted sound device is shown.

[0026] Figure 4b yes Figure 1 A side view of the head mounted sound device is shown.

[0027] Figure 5 yes Figure 3a The front view of the rear pylon is shown.

[0028] Figure 6 It is along Figure 5 Cross-section view obtained by cutting line AA.

[0029] Figure 7 3 is a schematic structural diagram 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.

[0030] Figure 8 yes Figure 7 Schematic diagram of the outer cortical end shown.

[0031] Figure 9 yes Figure 1 A three-dimensional schematic diagram of the connection between the middle functional compartment and the rear hanging.

[0032] Figure 10 It is a three-dimensional schematic diagram of a functional warehouse according to some embodiments of this specification.

[0033] Figure 11a is a schematic three-dimensional diagram of the end of the outer skin layer according to some embodiments of the present specification.

[0034] Figure 11b yes Figure 11a A side view of the end of the outer layer is shown.

[0035] Figure 12 This is a schematic diagram of the connection between the functional compartment and the rear suspension according to some embodiments of this specification.

[0036] Figure 13 is a schematic diagram of the end of the outer skin layer according to some embodiments of the present specification.

[0037] Figure 14 is a schematic diagram of the end portion of a rear hanger according to some embodiments of the present specification.

[0038] Figure 15 yes Figure 3a Enlarged view of part I in the middle.

[0039] Figure 16 1 is a schematic diagram of the connection between the connector and the locking member according to some embodiments of the present specification. In the figure, there is only one locking member.

[0040] Figure 17 Schematic diagram of the positions of the locking member and the housing according to some embodiments of this specification, wherein the number of the locking member is one.

[0041] Figure 18 This is a cross-sectional schematic diagram of the connection between the locking member, the housing, and the connector according to some embodiments of this specification, and the number of the locking member is one.

[0042] Figure 19 This is a schematic diagram of the connection between the connector and the locking member according to some embodiments of this specification, where there are two locking members.

[0043] Figure 20This is a cross-sectional schematic diagram of the connection between the locking member, the housing, and the connector according to some embodiments of this specification, and the number of the locking members is two.

[0044] Figure 21 is a top view of a connector according to some embodiments of the present specification.

[0045] Figure 22 is a schematic diagram of a rear hanging end according to some embodiments of the present specification.

[0046] Figure 23 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.

[0047] Figure 24 yes Figure 23 Side view of the structure shown.

[0048] Figure 25 It is a three-dimensional schematic diagram of the connection between the rear hook and the functional compartment hook in some embodiments.

[0049] Figure 26 It is a cross-sectional schematic diagram of the connection between the rear hook and the functional compartment hook in some embodiments. DETAILED DESCRIPTION

[0050] In order to make the above-mentioned objects, 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 will 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, rather than all, structures related to the present application are shown in the accompanying drawings. 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.

[0051] As used herein, the terms "comprise," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0052] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] like Figure 1 As shown, the embodiments of this specification describe a head-mounted sound-emitting device that can be worn on a human head and enables a person to hear sound, for example, through 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 the person. Exemplarily, the sound-emitting unit 10 is worn at a position corresponding to the human ear.

[0054] Figure 1 The head-mounted sound device shown in the figure is a binaural headphone, which includes two sound units 10 (or earphone heads), and also includes a back hanger 2 suitable for wrapping around the back of the head, two ear hangers 3 suitable for hooking on the ears, and two functional compartments 4. The functional compartments 4 are used to accommodate a control circuit board and / or batteries. For example, the two functional compartments 4 are respectively a control compartment for accommodating a control circuit board and a battery compartment for accommodating batteries. For another example, each functional compartment 4 accommodates a control circuit board and / or batteries. The back hanger 2 is connected between the two functional compartments 4, and the two sound units 10 are respectively arranged corresponding to the two functional compartments 4. The sound units 10 and the corresponding functional compartments 4 are connected by ear hangers 3. Taking the two functional compartments 4 as an example, the back hanger 2 is connected between the control compartment and the battery compartment, and the control compartment and one of the sound units 10 and the battery compartment and the other sound unit 10 are both connected by an ear hanger 3. The head-mounted sound device is symmetrical as a whole to improve wearing comfort.

[0055] Optionally, the head-mounted sound device is a bone conduction headset, whose sound unit 10 is equipped with a bone conduction sound device 100 capable of generating vibrations. When the bone conduction headset is in use, the sound unit 10 is located in front of the ear, in contact with the skin of the face, and transmits mechanical vibrations to the skin and further to the human auditory system, allowing the user to hear the sound. Furthermore, the sound unit 10 of the head-mounted sound device also optionally includes an air conduction sound device 101 capable of generating air-conducted sound through diaphragm vibration. The sound unit 10 is provided with a sound outlet 1021 for the air-conducted sound to be emitted.

[0056] Figure 2In the embodiment shown, 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 that is close to the human ear when the head-mounted sound device is worn. The air conduction sound device 101 is disposed near 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-emitting device 101 can be positioned close to the human ear and emit sound toward the ear, which helps improve the directness and clarity of sound, reduces sound loss and distortion, and enables the user to hear louder air-conducted sound, with higher sound efficiency and better effects. Furthermore, the volume of the air-conducting sound-emitting device 101 can be appropriately reduced, facilitating miniaturization. Furthermore, the bone-conducting sound-emitting device 100 is located farther from the sound outlet 1021, which can reduce interference caused by internal sound waves emitted from the sound outlet 1021 when the bone-conducting sound-emitting device 100 vibrates. It will be understood that the proximal end 1020 is also the end of the housing assembly 102 that is close to the functional compartment 4, and the sound outlet 1021 is provided on the end surface of the housing assembly 102 that faces the functional compartment 4. It will be understood that although this specification uses binaural headphones as an example, head-mounted sound-emitting devices are not limited to binaural headphones and can also include electronic devices such as hearing aids, audio glasses, VR devices, and AR devices.

[0057] In some embodiments, as Figure 3a and Figure 3b As shown, the back hanger 2 includes a conductor 20, an elastic wire 21, and an outer layer 22 covering the conductor 20 and the elastic wire 21. The two ends of the back hanger 2 are connected to the two functional compartments 4. The conductor 20 extends into the functional compartments 4 and electrically connects to the electronic components therein. The elastic wire 21 helps the back hanger 2 maintain its specific shape and provides the clamping force (also known as contact force, squeezing force, etc.) that keeps the sound unit 10 in close contact with the facial skin during use. In some embodiments, the back hanger 2 also includes two connectors 23 located at the ends of the outer layer 22, which are used to plug and securely connect to the functional compartments 4.

[0058] It should be noted that the drawings of this application all show structural schematic diagrams of the head-mounted sound device when it is in a natural state when not worn.

[0059] In some embodiments, as Figure 4a As shown, Figure 4a The top view of the head-mounted sound device is shown. In the figure, the head-mounted sound device is in a natural state and 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 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 and is symmetrical about the symmetry plane 2a. The second curved portion 2c extends in a direction away from the first curved portion 2b and is in the shape of a curve that bends toward the side where the symmetry plane 2a is located (for example, it can be an arc or other curve shape). The two second curved portions 2c are symmetrical about the symmetry plane 2a. Optionally, the second curved portions 2c are in the shape of a curve, for example, a curve with a changing curvature. The arc curvature is uniform. When the user wears the earphones, the force applied to each point within the first curved portion 2b of the back hook 2 is uniform, and the clamping force applied to the left and right ears is more uniform. The back hook 2 is less likely to produce a folding point (fixed force point) due to excessive changes in curvature. The folding point may cause the back hook 2 to twist up and down, resulting in uneven force on the left and right sides, causing discomfort when wearing. In severe cases, due to long-term uneven force, the earphones may break.

[0060] In the embodiment described in this specification, the plane on which the centerline of the portion of the elastic metal wire 21 corresponding to the first curved portion 2b lies is reference plane B. When viewed from above, the centerline of the elastic metal wire 21 lies perpendicular to reference plane B, and when observing the head-mounted sound-emitting device from a top-down perspective. Optionally, the centerline of the elastic metal wire 21 lies on 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 hook 2 has two outermost end points O4 and right end point O5 in the width direction of the earphone, and a rear end point O6 located at the rear and outermost end in the length direction. The plane formed by the left end point O4, the right end point O5, and the rear end point O6 is parallel (or substantially parallel) to (or even overlaps with) reference plane B, and can be approximated as reference plane B.

[0061] The arcuate shape of the first curved portion 2b can be understood as having an arcuate centerline. The midline between the inner and outer contours of the first curved portion 2b in a plan view can be approximated as the centerline of the first curved portion 2b, with the midline equidistant from the inner and outer contours (for example, a line connecting the widthwise midpoints of multiple locations on the inner and outer contours of the first curved portion 2b can form the midline). Similarly, the curved shape of the second curved portion 2c can be understood as having a curved centerline. The midline between the inner and outer contours of the second curved portion 2c in a plan view can be approximated as the centerline of the second curved portion 2c, with the center O3 being the center of the circle containing the centerline. Figure 4a The middle line 2g and the middle line 2h shown in FIG. 2 are the middle lines of the first curved portion 2b and the second curved portion 2c, respectively.

[0062] In some embodiments, the diameter of the first curved portion 2b ranges from 80 to 120 mm, where 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 the earphones are easy to fall off when worn. If the diameter is too small, the clamping force is too tight, and the earphones are easy to feel tender when worn. Further optionally, the diameter of the first curved portion 2b ranges from 90 to 110 mm, and further optionally from 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 exercising with the earphones, the earphones can also be worn stably and are not easy to loosen or fall off.

[0063] In some embodiments, the central angle α1 of the first curved portion 2b ranges from 100° to 180°. The central angle α1 is the angle between the center O3 of the first curved portion 2b and two connecting lines 2e between the two ends of the first curved portion 2b. For example, the two connecting lines 2e can be formed by connecting the center O3 and the two ends of the midline of the first curved portion 2b. The connecting lines 2e can also serve as the dividing line between the first curved portion 2b and the second curved portion 2c. A too large angle can result in an excessively tight clamping force on the earphones, which can cause pain when worn. A too small angle can weaken the clamping force and, due to the uneven curvature of the back hook 2, create fixed stress points, making the back hook susceptible to breakage. Furthermore, the central angle α1 of the first curved portion 2b can optionally range from 110° to 150°, and more preferably from 115° to 125°, such as 115°, 120°, or 125°. This further ensures that the back hook 2 has an appropriate clamping force and improves wearing comfort.

[0064] Continue to refer Figure 4a In a top view, the back strap 2 has a reference surface 2f, which passes through the center O3 of the first curved portion 2b and is perpendicular to the symmetry plane 2a and the reference plane B. When the central angle α1 is less than 180°, the two ends of each second curved portion 2c are located on either side of the reference surface 2f, and the spacing D6 between the portions of the two second curved portions 2c located at the reference surface 2f along the width of the headset is greater than the spacing D1 and D7 between their ends along the width of the headset. The spacing here refers to the spacing between the inner contours of the corresponding portions. In this way, the width of the back strap 2 gradually increases toward the reference surface 2f and gradually decreases after crossing the reference surface 2f, which can better adapt to the head shape, provide clamping force, and promote a more comfortable wear.

[0065] In some embodiments, the ratio of the length of the first curved portion 2b to the length of the outer skin 22 of the rear hanger 2 is 0.4 to 0.6. Both the length of the first curved portion 2b and the length of the outer skin 22 refer to the length of their centerlines. The centerline length of the first curved portion 2b (or outer skin 22) can be approximated as half the sum of the lengths of the inner and outer contours of the first curved portion 2b (or outer skin 22) when viewed from above. The length of the outer skin 22 excludes the covering portion 220 described below. It is understood that the clamping force is related to the length ratio of the first curved portion 2b to the outer skin 22. A greater ratio results in a greater clamping force. Furthermore, a greater proportion of the first curved portion 2b contributes to a more uniform force distribution on the rear hanger 2, making it less likely to generate a kink. Setting the ratio of the first curved portion 2b to the outer skin 22 of the rear hanger 2 to 0.4 to 0.6 helps ensure an appropriate clamping force while further enhancing the overall anti-breakage performance of the rear hanger 2. Further optionally, the ratio of the length of the first curved portion 2b to the length of the outer skin 22 of the rear hanger 2 is 0.45 to 0.55, and further optionally 0.47 to 0.53, to further ensure the effect.

[0066] 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 22. The spacing distance D1 refers to the shortest distance between the two ends of the outer skin 22. The spacing distance D1 is related to the clamping force when the earphone is worn. Optionally, the ratio of the spacing distance D1 to the diameter of the first curved portion 2b is in the range of 0.5 to 1.2. The setting of the clamping force needs to take into account both wearing comfort and stability. The specific clamping force can be adjusted by the ratio of the spacing distance D1 to the diameter of the first curved portion 2b. When the diameter of the first curved portion 2b is constant, the larger the ratio, the larger the distance between the two functional compartments 4. However, when the ratio is too large, it is easy to cause loose wearing, poor stability, and easy falling off; the smaller the ratio, the smaller the distance between the two functional compartments 4, the tighter wearing, and 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 to the diameter of the first curved portion 2b to 0.5 to 1.2 can make the ratio range more suitable and the wearing stability and comfort better. Further optionally, the ratio of the spacing distance D1 to the diameter of the first curved portion 2b 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, to further ensure the effect.

[0067] Optionally, the two functional compartments 4 extend in a direction away from the first curved portion 2b and move closer to the symmetry plane 2a, as shown in FIG. 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 or 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 the wearer to be too tight and cause tenderness when wearing; if the angle is too small, it is easy to cause the wearer to be too loose and easy to fall off when wearing. Setting the angle α2 to 15° to 60°, which is in a relatively suitable range, is conducive to obtaining a suitable clamping force and ensuring firmness and comfort when wearing. Further optionally, the angle α2 is 20° to 40°, and further optionally 25° to 30°, to further ensure the effect.

[0068] Optionally, the extension direction of the functional compartment 4 is consistent with the extension direction of the end of the rear hanger 2 and the extension direction of the connector 23 to facilitate installation and ensure a clamping effect. The extension direction of the functional compartment 4 can be understood as the extension direction of its center line 4a, which is a line equidistant from the inner and outer contours of the functional compartment 4 in a top view (for example, a line connecting the widthwise midpoints of multiple locations on the inner and outer contours of the functional compartment 4 can form the center line).

[0069] The elasticity of the rear hanging 2 is mainly provided by the elastic wire 21. Therefore, the effective length of the rear hanging 2 can be regarded as the length of the elastic wire 21. Figure 4bThe effective length of the back hanger 2 (or the length of the elastic metal wire 21) ranges from 170 to 220 mm. The ear hook 3 has a contact point O7 with the ear. The contact point O7 can be approximated as the highest point of the inner contour of the head-mounted sound device when viewed from the side (left or right). The distance D9 from the rear end point O6 of the back hanger 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 ergonomic considerations. When wearing the earphones, a certain safety distance must be left between the back hanger 2 and the head. If the distance is too short, some users may hit the back hanger 2 with their heads due to stretching and deformation during wearing, making it impossible to wear it properly. If the distance is too long, the clamping force is too small during wearing, making it easy to loosen and fall off. In addition, the back hanger 2 may hit the seat or other obstacles during use, lifting the earphones. At the same time, the back hanger 2 is prone to twisting and deformation when worn. During exercise, the tail of the back hanger 2 will shake up and down, making it less stable to wear. Setting the effective length of the back hanger 2 to 170-220 mm and the distance D9 to 100-140 mm can provide a more appropriate distance between the back hanger 2 and the head, ensuring wearing comfort and secure grip. Alternatively, the effective length of the back hanger 2 can be 180-210 mm, and the distance D9 can be 105-130 mm. Even more preferably, the effective length of the back hanger 2 can be 195-205 mm, such as 195 mm, 200 mm, or 205 mm, and the distance D9 can be 110-120 mm, such as 110, 115, or 120 mm, to further ensure the effect.

[0070] Considering the ergonomics of the space for the glasses legs, optional, refer to Figure 1 By configuring the geometry of the ear hook 3, the included angle between the contact surface 10a of the earphone head and the human body and the inner surface 4c of the functional compartment 4 is set to 150° to 170°. When the head-mounted sound device is worn on the human head, the contact surface 10a deflects toward the face. Therefore, the ear hook 3 and the functional compartment 4 deviate somewhat outward, away from the head. This facilitates the formation of a gap between the ear hook 3 and the skin of the head. This gap creates space for the temples of glasses. This ensures that when the user wears glasses, the temples of the glasses and the ear hook 3 of the earphones (especially the curved portion of the ear hook 3) do not interfere with each other, or interfere less, making it easier to wear glasses and headphones simultaneously and enhancing the stability of the glasses. The included angle between the contact surface 10a and the inner surface 4c of the functional compartment 4 can further be set to 160° to 170°, and further preferably 161° to 165°.

[0071] It is understood that, in addition to providing the majority of the clamping force, the back 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, and combined with the structure, shape, size, and setting angle of the functional compartment of the above-mentioned back hook 2, the sound outlet 1021 of the earphone head can be placed close to the appropriate position next to the ear, allowing sound waves to be transmitted to the eardrum through the shortest possible propagation path in the air, thereby improving the low-frequency sensitivity of the earphones, 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 sensitivity of the low frequency decreases, and the distortion increases. Of course, it is not the case that the closer to the ear canal, the better. The closer to the ear canal, the more contact the earphone head has with the tragus. The tragus is a protruding cartilage structure and is more sensitive to vibration and external contact. Although the sound hole 1021 close to the ear canal can increase sensitivity, the tragus will feel uncomfortable due to its sensitivity, so the sound hole 1021 should be configured at a suitable distance from the ear canal.

[0072] To make wearing more comfortable, the outer layer 22 is generally made of a soft elastic material, which provides a better touch when in contact with the skin. Common soft elastic materials include silicone, TPU (thermoplastic polyurethane elastomer), TPE (thermoplastic elastomer), and rubber. In some embodiments, considering the extreme application scenarios of the back-hook (high and low temperature, high humidity, extreme bending and stretching, sweat and salt spray pollution) and the corresponding reliability testing requirements, the material of the outer layer 22 can be selected from silicone, which has the characteristics of high and low temperature resistance, weather resistance, and aging resistance, which can fully meet user needs and experience.

[0073] The hardness of the silicone material of the outer skin layer 22 also has a certain impact 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 be 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 A hardness) 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 optionally 55° to 65°, to further ensure the effect.

[0074] In some embodiments, the mass of the back hanger 2 ranges from 3 to 8 grams. The mass of the back hanger 2 is the mass of the earphone excluding the sound unit 10, the ear hook 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 entire device will increase, affecting the wearing experience. Moreover, when wearing the earphones and exercising, the back hanger 2 will easily swing up and down, making the earphones unstable. If the back hanger 2 is too light, although it meets the lightweight design requirements of the earphones, the diameter of the elastic metal wire 21 is too small, resulting in poor strength and elasticity, making it easy to fall off when worn. Alternatively, while ensuring the diameter of the elastic metal wire 21, the thickness of the outer skin 2 cannot be guaranteed, which can easily cause the outer skin 2 to rupture when the back hanger 2 is bent. To balance the lightweight design of the headset and the practical requirements of ensuring a reasonable weight distribution among the various components of the headset, ensuring even weight distribution and keeping the center of gravity as forward as possible when worn, thereby preventing the headset from tilting backward when worn (the so-called tilting refers to the phenomenon in which the center of gravity of the headset is close to the back hook 2, causing the back hook 2 to fall backward when worn by the user), the mass of the back hook 2 is set to 3 to 8 grams. This mass is more appropriate, can reduce the shaking of the back hook 2 during exercise, and is also conducive to ensuring the diameter of the elastic metal wire 21 and the thickness of the outer skin 22, so that the back hook 2 has good elasticity and reliability. Further optionally, the mass range of the back hook 2 is 4 to 7 grams, and even more optionally, the mass range of the back hook 2 is 5 to 6 grams, for example, 5g, 5.2g, 5.4g, 5.6g, 5.8g, or 6g, etc., to further ensure the effect.

[0075] The outer skin 22 has a minimum cross-section. The cross-section of the outer skin 22 refers to the cross-section obtained by cutting the outer skin 22 along a radial plane. The minimum cross-section is the cross-section with the smallest cross-sectional area among the obtained cross-sections. The cross-sectional area refers to the area of ​​the 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 22 is constant, if the ratio is too large, the elastic metal wire 21 will be too thick, the clamping force of the back hanging 2 will be too large, and the wearing experience will be poor. In addition, the outer skin 22 is relatively thin and more likely to break when bent. At the same time, during the production process, the wire 20 and the elastic metal wire 21 covered by the outer skin 22 are prone to exposure, resulting in low yield and increased production costs. If the ratio is too small, the clamping force will be too small, the wearer will easily fall off, and the wearing stability will be poor. Setting the ratio of the diameter D8 of the elastic wire 21 to the width W2 of the smallest cross section within a range of 0.2 to 0.6 helps to achieve a more appropriate diameter D8 of the elastic wire 21 and the thickness of the outer layer 22 covering the elastic wire 21, thereby obtaining a suitable clamping force, ensuring the bending performance of the outer layer 22, and improving reliability and comfort in use. Furthermore, the ratio of the diameter D8 of the elastic wire 21 to the width W2 of the smallest cross section can optionally be set within a range of 0.3 to 0.5, and further, 0.35 to 0.45, to further ensure the desired effect.

[0076] Optional, such as Figure 5 and Figure 6 As shown, the smallest cross-sectional area lies on the symmetry plane 2a. In other words, the cross-sectional area obtained by cutting the outer skin 22 through the symmetry plane 2a is the smallest cross-sectional area. In this case, the smallest cross-sectional area of ​​the outer skin 22 is the middle cross-sectional area A (the cross-sectional area passing through the middle) of the outer skin 22. For example, the outer cross-sectional profile of the outer skin 22 can be configured to gradually taper from the end 22a toward the middle 22b, so that the cross-sectional area at the middle has a smaller cross-sectional area. This makes the middle portion of the back strap 2 lighter than the end portion, further reducing movement during movement and improving wearer stability. Furthermore, the larger end 22a of the outer skin 22 facilitates installation of mounting structures such as the fixed connector 23, achieving a better seal.

[0077] In some embodiments, the cross section of the outer skin 22 is circular. In other embodiments, Figures 6 to 8 The cross section of the outer skin 22 is flat, and the length of the cross section is greater than the width, for example, it can be Figure 6The ellipse shown. It is understood that when the cross-section is a regular shape (such as a rectangle, ellipse, etc.) or an approximately regular shape, the length and width of the cross-section are interpreted in their usual sense. When the cross-section is an irregular shape, unless otherwise specified, the length is the distance between the two points on the outer contour of the cross-section that are farthest apart. The line connecting the two points is the length direction, the width direction is perpendicular to the length direction, and the width is the maximum dimension of the outer contour of the cross-section along the width direction. Optionally, the length direction X1 of the middle cross-section A of the outer skin layer 22 is perpendicular to the reference plane B, 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, the length direction of the cross-section of the outer skin layer 22 changes angle from the middle position to the end 22a of the outer skin layer 22 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 coincides with the reference plane B. In this way, 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 change angle of the cross section of the outer skin layer 22 from the middle position to its end 22a is 90°.

[0078] The change in the length and width of the cross-section can be controlled by controlling the size of the outer skin 22 in different parts. For example, from the middle 22b to the end 22a of the outer skin 22, the size of the outer skin 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 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 22 along the height direction of the earphone. The closer to the end of the outer skin 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 22 can become perpendicular to the length of the middle cross-section A.

[0079] It is understandable that the middle section A has the smallest cross-sectional area, the lowest strength, and is most susceptible to torsional deformation. When worn, if torsional deformation occurs in the middle portion of the back hanging 2, the two sound units 10 will be misaligned vertically, affecting wearing comfort and stability. Setting the middle section A so that its length direction X1 is perpendicular to the reference plane B can effectively improve the stiffness and strength of the middle section A in the length direction X1, thereby improving its torsional resistance and ensuring that the sound units 10 are not easily misaligned vertically when worn. Furthermore, at the end of the outer skin 22, due to its relatively larger cross-sectional area, it has better resistance to torsional deformation. When the earphones are worn, the end 22a is mainly subjected to bending forces along the direction of the reference plane B. Setting the length direction of the first outer end surface 2d to be parallel to or coincident with the reference plane B can improve its resistance to bending deformation in this direction and ensure the connection strength at the connection point between the outer skin 22 and the functional compartment 4.

[0080] It should be noted that while arranging the cross section of the intermediate section A such that the longitudinal direction X1 is perpendicular to the reference plane B can achieve relatively good anti-torsion effects, this does not necessarily require perpendicularity. For example, when the longitudinal direction X1 forms an angle of 70° to 90° with the reference plane B, good anti-torsion effects can still be achieved. Furthermore, the change in the longitudinal direction angle of the cross section of the outer skin layer 22 from the middle position to the end 22a thereof does not necessarily require 90° and can, for example, be 60° to 90°.

[0081] In order to further ensure the anti-torsion 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.

[0082] Optional, such as Figure 8 As shown, Figure 8A schematic diagram of the end of the outer skin 22 observed along the plugging direction is shown. For the sake of clarity, the structure of the holes and other fittings between the outer skin 22 and the connector 23 is not shown. The ratio of the length L1 of the end of the outer skin 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 22 and the width W If the ratio is too large, the volume of the functional compartment 4 will be too large, affecting the appearance. At the same time, it will also increase the weight of the whole device, resulting in a change in the center of gravity when wearing and poor stability. If the ratio is too small, the external dimensions of the connector 23 will be too small, making it easy to fall out of the functional compartment 4. At the same time, it will also cause the wall thickness (or called the thickness of the body, shell thickness, etc.) of the shell at the plug-in position to be too thin, which will be insufficient in strength and prone to cracking. Setting the ratio range to 3.2 to 1.2 makes the ratio more appropriate, the overall quality and size of the earphones more appropriate, and the wearing stability and comfort better. Further optionally, the ratio of length L1 to length L2 is 3 to 1.9, and further optionally 2.7 to 2.2 to further ensure the effect.

[0083] Optionally, the width W2 of the middle section A is 1.6 to 4 mm. A larger cross-section will increase the size and weight of the back strap 2, affecting the wearing experience. A smaller cross-section can easily cause thread leakage and skin breakage during use, resulting in a low yield rate during production. Furthermore, the width W2 of the middle section A can be 1.9 to 3.5 mm, further 2.3 to 3.1 mm, and even further 2.7 to 2.9 mm, for example, 2.7 mm, 2.8 mm, or 2.9 mm, to achieve a more appropriate width W2.

[0084] 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 in 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). Figure 10 ) are in basically the same axial direction.

[0085] In some embodiments, the wire 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 wire 20. When the user bends the back hook 2 inward, the wire 20 is not easily damaged or poorly contacted due to stretching deformation. Further optionally, the center lines of the wire 20 and the elastic metal wire 21 at least corresponding to the first bent 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 wire 20 and the elastic metal wire 21 are located on the same plane.

[0086] The elastic metal wire 21 is made of elastic material, for example, it can be a single metal, or it can be an alloy material including multiple metal materials, such as aluminum alloy, magnesium alloy, titanium alloy, spring steel, etc. It can also be a composite material including metal 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 deformation.

[0087] The average width between the two tragus of an adult is approximately 140 mm. In some embodiments, to ensure both stability and comfort when the user wears the headphones, when the headphones are opened to a distance D1 between the ends of the outer skin 22 of 140 mm, the contact force of the sound unit 10 on the facial skin is 0.22 to 1.33 N. When measuring force, one sound unit 10 of the headphones can be fixed to an external device, and the surface of the other sound unit 10 that is intended to fit the face can be brought into contact with a force sensor. The force sensor is then moved to push the other sound unit 10 away until the distance D1 between the two ends of the outer skin 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. Optionally, the contact force can be 0.4 to 0.8 N, and even more preferably 0.5 to 0.7 N, to further improve the effect. It can be understood that the magnitude of the contact force can be adjusted through the relevant structures mentioned above. For example, the clamping force can be adjusted by parameters such as the curvature shape, 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.

[0088] like Figure 3b 、 Figure 9 and Figure 10 As shown, the rear suspension 2 is connected to the functional compartment 4 via a connector 23. The functional compartment 4 includes a housing 40 with a connector 405, into which the connector 23 mates. The outer layer 22 can be injection molded over the connector 23, the wire 20, and the elastic wire 21 to securely connect them. The wire 20 extends through the connector 23, and a connector 23 is connected at each end of the elastic wire 21.

[0089] In some embodiments, the outer skin layer 22 is provided with at least two non-coplanar surfaces in contact with the housing 40 to increase the contact area and improve the waterproof effect. Figure 11a and Figure 11b As shown, the end 22a of the outer skin 22 (also the end of the second curved portion 2c in the illustrated embodiment) is provided with at least one slot 24. This allows the end 22a of the outer skin 22 to form, in addition to the first outer end surface 2d located on the outside, at least one second outer end surface 240. The second outer end surface 240 serves as the bottom surface of the slot 24, and the side surface of the slot 24 serves as a connecting surface 241, which connects the second outer end surface 240 to the first outer end surface 2d. The number of slots 24 can be one or more. In the illustrated embodiment, there are two slots 24, thereby forming two second outer end surfaces 240. The two slots 24 are located on the same side (upper side) of the first outer end surface 2d, and their connecting surfaces 241 are coplanar. In the figure, the two slots 24 have different depths, thereby forming a stepped shape.

[0090] 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. Figure 10 and Figure 12 As shown, the housing 40 is provided with a first contact surface 400 for contacting with the first outer end surface 2d, a second contact surface 401 for contacting with the second outer end surface 240, and a third contact surface 402 for contacting with the connecting surface 241 of the slot 24. It is 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 back hook 2 and the functional compartment 4 are connected, the first outer end surface 2d contacts the first contact surface 400, the second outer end surface 240 contacts the corresponding second contact surface 401, and the connecting surface 241 of the slot 24 contacts the third contact surface 402. The non-coplanar arrangement of the first outer end surface 2d and the second outer end surface 240 increases the total contact area between the back hook 2 and the housing 40, thereby increasing the sealing area at the plug-in location, enhancing the sealing effect and improving the airtightness of the headphone plug-in location. The slot 24 also serves as a positioning function.

[0091] like Figure 11b As shown, the first outer end surface 2d and the second outer end surface 240 are offset from each other. The offset distance D3 between the adjacent ends of the first outer end surface 2d and the second outer end surface 240 can be selected to be 1 to 3 mm. The offset distance D3 can be understood as the width of the connecting surface 241 of the slot 24. Excessive offset distance will result in an excessively long mating position, affecting the appearance and increasing the volume and weight. Too small an offset distance will not achieve a good airtightness. Furthermore, the offset distance D3 can be selected to be 1.5 to 2.5 mm, and even more preferably 1.7 to 2 mm, to further strike a balance between volume and weight and sealing effectiveness.

[0092] In some embodiments, the first outer end surface 2d and the second outer end surface 240 are arranged in parallel. Figure 11b , the first outer end face 2d and at least one second outer end face 240 are not parallel, that is, the first outer end face 2d is relatively 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 Figure 11a and Figure 11b In the illustrated embodiment, the first outer end face 2d and the two second outer end faces 240 are not parallel. Optionally, the 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 surfaces to be tilted, thereby increasing the contact area and improving the sealing performance. When the angle α3 is too large, the plug-in position will be too long, affecting the appearance and increasing the volume and weight. If the staggered distance is too small, the improvement in 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] Optionally, the connecting surface 241 is parallel to or coincides with the plugging direction.

[0097] 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 on which the surface is located. When the surface is a curved surface, there is a tangent plane at the most convex or concave point of the curved surface. In this case, 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 can be a plane or a curved surface (not necessarily both planes or curved surfaces). 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 configured as a curved surface so that the two can fit tightly. Figure 11b In the illustrated embodiment, both second outer end surfaces 240 are curved surfaces, with their most concave points defining a tangent plane 240a. The connecting surface 241 and the first outer end surface 2d are planar surfaces. Angle α3 refers to the angle between the connecting surface 241 and the tangent plane 240a, and angle α4 refers to the angle between the first outer end surface 2d and the tangent plane 240a. In other embodiments, the first outer end surface 2d and the second outer end surface 240 may be planar surfaces. It will be appreciated that planar surfaces are easier to machine and have greater dimensional accuracy than curved surfaces. However, 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 planar surface, thereby facilitating a better sealing effect.

[0098] It is understood that although this article uses the example of providing two grooves 24 at the end 22a of the outer skin layer 22, 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. Figure 11a and Figure 13 , Figure 11a and Figure 13 Some embodiments are shown with two slots 24, wherein: Figure 13 In the illustrated embodiment, the two grooves 24 are arranged along the width direction of the end portion 22a, and the grooves 24 are deeper as they are farther away from the first outer end surface 2d, forming two second outer end surfaces 240 with different depths on the same side of the first outer end surface 2d. Figure 11aIn the illustrated embodiment, two grooves 24 are arranged along the length direction of the end portion 22a, wherein one of the grooves 24 is deeper, thereby forming two second outer end surfaces 240 of different depths located on the same side of the first outer end surface 2d. It is understandable that when the number and position of the grooves 24 are changed, the position of the outer shell 40 and the end portion of the rear hook 2 can be adjusted accordingly. The two are configured to achieve matching so that each second outer end surface 240 is in contact with the outer shell 40, thereby further improving the sealing and positioning effects.

[0099] 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.

[0100] It is understood that the contact surface between the outer skin layer 22 and the outer shell 40 can be sealed by dispensing glue to further enhance 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 glue coating area is increased, increasing the working space. Moreover, after being squeezed through the contact surface, the glue can be more reliably retained between the contact surfaces of the outer skin layer 22 and the outer shell 40 without easily overflowing, which helps to ensure a good appearance.

[0101] 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 may only have a first outer end surface 2d.

[0102] 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 interior of the housing 40. The housing 40 of the conventional connector structure is usually provided with a tubular connecting portion 920 extending outward for connecting with the connector 23. Figure 10 In the embodiment shown, the housing 40 is not provided with a connecting portion 920 (see reference numeral 920) protruding from the rear end face 40a. Figure 25 and Figure 26), but instead the connector jack 405 is directly opened on the rear end face 40a. The traditional tubular connecting portion 920 is usually designed to be extended and thickened according to the shape of the connector 23. Its wall thickness is relatively uniform and limited by the shape of the connector 23. Generally, the wall thickness of the connecting portion 920 is set to be thin due to the limited structural space, which is prone to cracking. By eliminating the connecting portion 920, the structure of the shell 40 can be simpler, the structural strength is better, and the volume is smaller. The thickness of the joint between the shell 40 and the connector 23 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 between the shell 40 and the rear hanger 2 is stronger and less prone to cracking.

[0103] 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 applied to the connection between the housing 40 and the back hook 2 when the earphones are 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 22, and the thickness direction is consistent with the width direction Y2 of the end 22a of the outer skin 22. Its width dimension can be set larger, making it easier to arrange 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 connection direction.

[0104] In some embodiments, reference Figure 14 and Figure 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 insertion direction is rectangular (including rectangular and approximately rectangular cases, for example, the four corners may be beveled or rounded), forming a relatively flat first surface 23b, an opposing second surface 23c, and two opposing side surfaces 23a connecting the first and second surfaces 23b and 23c. The first and second surfaces 23b and 23c are located at opposite ends of the thickness direction of the connector 23, and the two side surfaces 23a are located at opposite ends of the width direction of the connector 23. Optionally, the first surface 23b and the connecting surface 241 are both planar, and the first surface 23b is parallel to the connecting surface 241 of the slot 24 (including parallel and nearly parallel cases). This helps improve the positional dimensional accuracy of both, facilitates the control of step and gap during the assembly process, and also improves the appearance and simplifies the mold forming process. Further, optionally, the first surface 23b, the second surface 23c, and the side surfaces 23a are all planar, and the first and second surfaces 23b and 23c are parallel, and the two side surfaces 23a are parallel.

[0105] In some embodiments, the outer circumference of the connector 23 is provided with at least one boss 231 projecting outward in its radial direction (a direction perpendicular to its length). The outer circumference of the connector 23 refers to the surface of the connector 23 excluding the two end surfaces in the lengthwise direction, and includes the first surface 23b, the second surface 23c, and the side surfaces 23a. The boss 231 can be used for mold positioning. When the outer skin 22 is to be injection-molded on the outside of the connector 23, the boss 231 can be used to position the connector 23 with the mold, thereby improving positioning accuracy and preventing misalignment and deformation. For example, the boss 231 can be provided on at least one of the first surface 23b, the second surface 23c, or both side surfaces 23a. Optionally, the boss 231 can be provided on either the first surface 23b or the second surface 23c. Because the width of the connector 23 is greater than its thickness, the first surface 23b and the second surface 23c have relatively larger areas, 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 22 so that it can be used for positioning when the rear hanger 2 is assembled with the housing 40. Figure 10 and Figure 12 As shown, a positioning groove 4020 is provided on the shell 40, and the positioning groove 4020 can be matched with the boss 231 to achieve the positioning of the connector 23 and the shell 40, so that the relative position between the outer skin layer 22 and the shell 40 that need to be fitted is more accurate, thereby ensuring the waterproof and sealing effect.

[0106] Optionally, the boss 231 is at least partially exposed in at least one slot 24. Figure 15 In the illustrated embodiment, the slot 24 is located above the first outer end surface 2d. In this case, the first surface 23b is the top surface of the connector 23. In other embodiments, the slot 24 may also be located below the first outer end surface 2d. In this case, the first surface 23b is the bottom surface of the connector 23.

[0107] The boss 231 can be partially exposed on the covering outer skin 22, or it can be completely located outside the outer skin 22. When the boss 231 is partially exposed, it is partially covered by the outer skin 22, which can increase the contact area with the outer skin 22 and improve the connection force.

[0108] In some embodiments, the projection area of ​​the boss 231 on the first surface 23b along the thickness direction of the connector 23 is 0.5 to 2.5 mm. 2If the projection area is too small, the boss 231 will be insufficiently strong and easily broken, and thus 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 to 2.5 mm. 2 , which is beneficial to ensure 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 , further optional 1.4 ~ 1.7mm 2 , to further ensure the effect.

[0109] In some embodiments, as Figure 14 As shown, in the width direction of connector 23, the ratio of the length L5 of boss 231 to the width W3 of connector 23 is 0.2-1. If the ratio is too small, boss 231 will be insufficiently strong and too short to effectively position the connector. If the ratio is too large, the distance between boss 231 and the edge of connector 23 will be small, resulting in poor positioning of connector 23 in the length direction. Alternatively, the ratio of the length L5 of boss 231 to the width W3 of connector 23 can be 0.4-0.8, or even 0.5-0.6, to further improve positioning effectiveness.

[0110] The connection method between the connector 23 and the functional compartment 4 can be, for example, a hook connection, a riveting fixation, a screw fixation, etc. In some embodiments, the connector 23 and the functional compartment 4 are fixed by a locking member connection. Figures 16 to 18 As shown, the head-mounted sound device also includes a retaining member, which includes at least one retaining arm 50. The connector 23 is provided with a receiving portion 232 corresponding to the position and number of the retaining arm 50. The housing 40 is provided with a through hole 403 corresponding to the position and number of the retaining arm 50. The through hole 403 is connected to the connector 405. The through hole 403 and the receiving portion 232 are both used to insert the retaining arm 50. When the retaining arm 50 passes through the through hole 403 and is inserted into the receiving portion 232, part of it is located in the housing 40 and part of it 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 connector 23 and the receiving portion 232 and the through hole 403 can also be fixed by glue to further increase the firmness of the connection and the waterproof performance. The receiving portion 232 can be, for example, a semi-enclosed groove (for example Figure 19 As shown, it is connected to the side surface 23a), or it can be a closed hole (for example Figure 16 As shown), 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 18In the embodiment shown, the locking member is cylindrical and can be understood as comprising only 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 Figure 19 and Figure 20 In the illustrated embodiment, there are two latches, one located on each side 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. Furthermore, the latch is not limited to being cylindrical. For example, the latch can also be U-shaped, comprising two latch arms 50 extending in the same direction and a connecting portion connected between the two latch 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 is understood that, compared to one latch arm 50, two latch arms 50 can improve the firmness of the connection and the positioning effect. For example, it is less likely to tear off the latch arm 50 when pulling the rear hook 2.

[0111] It is understandable that the receiving portion 232 may or may not pass through the connector 23, for example, it may be a blind hole. Optionally, the receiving portion 232 passes through the connector 23 to improve the positioning effect and facilitate processing.

[0112] Optionally, the material of the locking part 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, etc. Metal materials and alloy materials have good tensile strength, which is conducive to ensuring the reliability of the locking part docking plug 23.

[0113] 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 Figure 21, the two end points of its opening can be connected by a connecting line 232a to form a closed projected area. The projected area of ​​the connector 23 includes the projected area of ​​the receiving portion 232. When the projected area of ​​the connector 23 is constant, if the ratio is too large, the receiving portion 232 will be too large, which will affect the overall strength of the connector 23. The connector 23 will be insufficiently strong and prone to breakage. If the ratio is too small, the gap of the receiving portion 232 will be too small, the position of the receiving portion 232 cannot be effectively positioned, and the cross-section of the clamping arm 50 will be too small, resulting in poor strength. Further, optionally, the ratio of the projected 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%, to further ensure the strength of the connector 23 and the clamping arm 50 and ensure the connection effect.

[0114] Optionally, when the connector 23 is held in place 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 product reliability. In some embodiments, as Figure 10 、 Figure 12 、 Figure 17 and Figure 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, which is sealed by the cover 407. The main housing 404 includes a first housing portion 4041 disposed opposite 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 each other. The first housing portion 4041, the second housing portion 4042, and the cover 407 are arranged in sequence along the height direction Z3 of the functional compartment 4 and are connected between the two third 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. Through hole 403 is provided in second shell portion 4042 and communicates with connector 405. When the retaining member is inserted into through hole 403 to position connector 23, it is located within housing 40. When cover 407 is installed on housing 40, the retaining member is located within the enclosed space formed by main shell 404 and cover 407, making it invisible from the outside and enhancing the aesthetics. Optionally, a receiving hole 406 corresponding to through hole 403 is provided in first shell portion 4041. The retaining arm 50 can pass through through hole 403 and into receiving hole 406, further enhancing the retaining effect and optimizing its load-bearing structure.

[0115] It is understood that in other embodiments, the locking member may also be exposed on the housing 40. The through hole 403 is not limited to being located on the second shell portion 4042; for example, it may also be located on the first shell portion 4041 or the third shell portion 4043. However, since the first surface 23b and the second surface 23c of the connector 23 are relatively large and provide ample space, the receiving portion 232 is preferably located on the first surface 23b and / or the second surface 23c. Accordingly, the through hole 403 may be located on the first shell portion 4041 or the second shell portion 4042.

[0116] Optionally, in some embodiments, when the connector 23 is limited by two or more than two clamping arms 50, the clamping arms 50 are spaced apart along the length direction of the connector 23. In other embodiments, such as Figure 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.

[0117] Optionally, the axis direction of the clamping 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.

[0118] Compared with hook connection, pin riveting and screw fixing, the method of connecting with a locking part has many advantages. For example, when connected by a 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 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 is not in line with the lightweight design of bone conduction headphones.

[0119] The latching connection effectively positions and secures the connector 23. Furthermore, the relatively simple structure and minimal space usage contribute to cost reduction, lightweight design, and aesthetically pleasing appearance of the bone conduction headset. Furthermore, combined with the multi-faceted sealing method described above, the sealing performance of the connection between the rear hook 2 and the functional compartment 4 can be reliably guaranteed.

[0120] The connector 23 can be made of a high-strength material with good tensile and yield strength, such as PA (polyamide), PA+GF (a composite material of polyacrylamide and glass fiber), or metal. While PA and PA+GF materials meet high-strength requirements, their moisture absorption and expansion can cause cracks in the housing they are assembled with, affecting reliability. Therefore, the earphones should be used in a relatively dry environment.

[0121] Optionally, the connector 23 is made of metal material, and further can 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 can be made smaller in volume, so that the volume of the functional compartment 4 can be further reduced, thereby further achieving 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 takes into account the lower 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, and the reliability is better. At the same time, the volume of the shell 40 can also be made smaller.

[0122] In some embodiments, the connector 23 is made of metal material, such as Figure 14 As shown, the width direction of the connector 23 coincides with the length direction X2 of the end portion of the outer skin 22. The ratio of the width W3 of the connector 23 to the length L1 of the end portion of the outer skin 22 is 0.4 to 0.8. When the width of the end portion of the outer skin 22 is constant, if the ratio is too large, the weight of the connector 23 increases, the thickness of the outer skin 22 reserved on both sides decreases, and the assembly airtightness and waterproofing performance deteriorate. If the ratio is too small, the connector 23 becomes smaller and weaker, and the connector 23's covering effect on the elastic wire 21 decreases, making it easier for the connector 23 to fall off the elastic wire 21. Alternatively, the ratio of the width W3 of the connector 23 to the length L1 of the end portion of the outer skin 22 can be 0.5 to 0.7, and even more preferably 0.55 to 0.65, to further ensure the desired effect and achieve a more reasonable size of the connector 23 and the end portion of the outer skin 22.

[0123] The outer skin 22 has a first outer endpoint O1, which is the outermost point in the longitudinal direction of its end 22a. To further ensure the secure connection between the connector 23 and the outer skin 22, a distance D4 between the connector 23 and the first outer endpoint O1 of the outer skin 22 is 0.8 to 2 mm in the width direction of the connector 23. If the outer dimensions of the end 22a of the outer skin 22 are constant, a larger distance D4 will reduce the width dimensions of the connector 23, resulting in poor overall strength and easy detachment from the elastic wire 21. If the distance D4 is too small, the width dimensions of the connector 23 will be too large, affecting the contact area between the left and right sides of the rear hanger 2 and the housing 40, resulting in poor assembly sealing. Alternatively, the distance D4 can be 1 to 1.6 mm, and even more preferably 1.1 to 1.3 mm, to achieve a more appropriate size for the connector 23 and the rear hanger 2, further ensuring the secure connection between the connector 23 and the outer skin 22 and the waterproofing effect after the rear hanger 2 is connected to the functional compartment 4.

[0124] Furthermore, the position of the connector 23 relative to the outer layer 22 in the thickness direction will also affect the firmness of the connection between the connector 23 and the outer layer 22 and the waterproof effect after the rear hook 2 is connected to the functional compartment 4. Figure 14 As shown, the outer skin 22 has a second outer endpoint O2, the outermost in the width direction of its end 22a. In the thickness direction of the connector 23, the distance D5 between the connector 23 and the second outer endpoint O2 of the outer skin 22 is 0.8 to 2 mm. Distance D5 refers to the distance between the first and second surfaces 23b, 23c of the connector 23 and the corresponding second outer endpoint O2, regardless of any protrusions or similar structures provided on the surfaces. Similarly, if the outer dimensions of the end of the back hanger 2 are constant, if distance D5 is too large, the outer dimensions of the connector 23 in the thickness direction will be too small, resulting in poor overall strength and easy separation from the elastic wire 21. If distance D5 is too small, the outer dimensions of the connector 23 in the thickness direction will be too large, affecting the contact area between the upper and lower sides of the back hanger 2 and the housing 40, resulting in poor assembly sealing. Further optionally, the distance D4 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.

[0125] In some embodiments, along the length of the connector 23, the ratio of the projected areas of the connector 23 and the end 22a of the outer skin 22 on the same plane perpendicular to the length of the connector 23 is 0.2 to 0.7. The projected area refers to the area enclosed by the outer contours of the projected areas of the connector 23 and the outer skin 22 on the same plane. When the outer dimensions of the end of the outer skin 22 are constant, if the ratio is too large, the thickness of the portion covering the outside of the connector 22 will be thin, the covering force will be poor, and the connector 23 will be prone to leakage. If the ratio is too small, the connector 23 will be small in size, weak in strength, and prone to breakage due to external forces. Setting the ratio to 0.2 to 0.7 is beneficial for ensuring the structural strength of the connector 23 while ensuring the connection strength between the connector 22 and the outer skin 22. Further optionally, the ratio of the projected 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 0.25-0.5, and further optionally 0.3-0.4, to further ensure the effect.

[0126] It is understandable that compared to conventional plastic connectors, the metal connector 23 generally has a smaller volume. Therefore, the ratio of the width W3 of the metal connector 23 to the length L1 of the end of the outer skin 22, the distance D4, the distance D5, and the ratio of the projected area of ​​the connector 23 to the end 22a of the outer skin 22 can all be made relatively larger, thereby improving the connection strength between the connector 23 and the outer skin 22 and preventing separation from the outer skin 22.

[0127] like Figure 12 and Figure 15 As shown, 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 to 1.8. When the length L6 of the connector 23 remains unchanged, if the distance ratio is too large, the length L5 is too short, and the connector 23 is likely to fall off from the outer skin 22; if the distance ratio is too small, the length L4 is too short, the length of the plug-in position of the connector 23 is too short, the strength of the plug-in position is insufficient, and the rear hanger 2 is likely to fall off from the shell 40. Setting the ratio of the length L4 to the length L5 to 0.9 to 1.8 can make the connection length of the connector 23 to the outer skin 22 and the connection length to the shell 40 more appropriate, which is conducive to ensuring 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 connector 23 exposed outside the outer skin 22 refers to the length of the exposed portion of connector 23 along the length of connector 23. Even if only a portion of the exposed portion (for example, the upper surface is exposed but the lower surface is not) is included in the length dimension. The length L5 of the portion of connector 23 located inside the outer skin 22 is calculated by subtracting the length L4 from the length L6 of connector 23. In some embodiments, the length L4 of the portion of connector 23 exposed outside the outer skin 22 is greater than the length L5 of the portion of connector 23 located inside the outer skin 22 to further ensure the effective length of the connection between connector 23 and housing 40 at the plug-in position, ensuring the strength and stability of the connection. Optionally, the ratio of length L4 to length L5 is 1 to 1.6, and even more preferably, 1.2 to 1.4, to further ensure the reliability of the connection between connector 23, outer skin 22, and housing 40.

[0128] In order to further improve the reliability of the connection between the connector 23 and the outer layer 22, as shown in FIG. Figure 16 As shown, the portion of the connector 23 located within the outer layer 22 is provided with a first groove 233. The outer layer 22 partially fills the first groove 233, which can increase the contact area between the outer layer 22 and the connector 23, thereby improving the reliability of the connection between the connector 23 and the outer layer 22. The number of first grooves 233 can be one or more. Figure 16In the illustrated embodiment, one side surface 23a in the width direction of the connector 23 is provided with an outwardly protruding rib 235 extending along its length. 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. Thus, the connector 23 is provided with two first grooves 233, effectively improving the secure connection with the outer skin 22. In other embodiments, ribs 235 may be provided on both side surfaces 23a in the width direction of the connector 23 to form four first grooves 233. Optionally, the two ribs 235 on each side are symmetrically arranged.

[0129] 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. Figure 16 In the illustrated embodiment, the ridges 236 and the bosses 231 are disposed on the same surface of the connector 23 (specifically, the first surface 23b) and extend along the width of the connector 23. In other embodiments, the ridges 236 may also be disposed on the second surface 23c or the side surface 23a. It will be appreciated that the width of the connector 23 is greater than its thickness. Therefore, disposing the ridges 236 on the first surface 23b or the second surface 23c and extending along the width can increase the size of the ridges 236, thereby improving the connection effect.

[0130] It is understood that by providing the first groove 233 and / or the ridge 236 on the connector 23, the connection strength between the connector 23 and the outer layer 22 can be effectively improved. Even if the length L5 of the portion of the connector 23 located within the outer layer 22 is shortened, a good connection can still be maintained. In particular, when the connector 23 is made of metal, its inherent volume may be relatively small, and the contact area with the outer layer 22 is also smaller. The provision of the above-mentioned structure helps to better ensure the connection strength between the outer layer 22 and the connector 23.

[0131] In some embodiments, as Figure 15 、 Figure 16 and Figure 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 are formed into a tapered shape with a small outer portion and a large inner portion to guide the connector 23 when it is inserted into the connector 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 portion located outside the outer skin 22, and the inner end refers to the end of the portion located inside the outer skin 22. Figure 16In the embodiment, the ridge 236 is provided on the inner end portion.

[0132] 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. Figure 15 and Figure 16 In the illustrated embodiment, the second groove 238 is provided only on one side of the end of the connector 23. In other embodiments, the second groove 238 may be provided on both sides. An outwardly projecting positioning bump (not shown) that mates with the second groove 238 is provided within the connector jack 405 of the housing 40. When the connector 23 is inserted into the connector jack 405, the positioning bump mates with the second groove 238, thereby providing positioning in the thickness direction and improving positioning accuracy, thereby further ensuring that the contact surfaces of the housing 40 and the outer skin layer 22 are accurately aligned and in contact, improving the sealing effect and the consistency of the overall assembly appearance difference. The appearance difference refers to the misalignment difference formed by the cooperation between the rear hook 2 and the housing 40.

[0133] The number of second grooves 238 is not limited. For example, in some embodiments, guide ribs similar to the ribs 235 can be provided on one side or both sides in the width direction of the outer end of the connector 23 (not shown in the figure). The guide ribs are protruding outward and extend along the plug-in direction. Two second grooves 238 are formed on both sides in the thickness direction of the guide ribs. A guide surface 2370 is formed on the guide ribs, and a guide hole adapted to the guide ribs is provided in the connector hole 405, thereby further achieving a positioning effect.

[0134] Optional, reference Figure 21 The length L8 of the second groove 238 is 0.5-1.2 mm, so that it can have a good positioning effect. Further optionally, the length L8 of the second groove 238 is 0.6-1 mm, and further optionally 0.7-0.9 mm, to further ensure the positioning effect.

[0135] 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.

[0136] The wire 20 passes through the connector 23 to enter the functional compartment 4. In some embodiments, as shown in FIG. Figure 15 、 Figure 16 and Figure 22As 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 also opened from the outer peripheral surface of the connector 23. The receiving groove 239 is used to accommodate the wire 20 so that the wire 20 can pass through the outer skin 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 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, can press the wire 20, and increase the overall sealing effect, thereby making the waterproof performance of the earphone more superior. 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 surface 220a of the covering portion 220 exposed on the connector 23 is flush with the outer peripheral surface (second surface 23c in the figure) of the connector 23 where the receiving groove 239 is located. This helps simplify the mold and places the parting surfaces of the connector 23 and outer layer 22 molds on the same plane. This significantly reduces the possibility of glue overflow from the outer layer 22 material, improves the seal between the outer layer 22 and the connector 23, and prevents water infiltration, thereby improving the waterproof performance of the earphones. Furthermore, optionally, the end surface 220b of the covering portion 220 exposed on the connector 23 is flush with or recessed into the end surface 23d of the connector 23, so that the covering portion 220 does not interfere with the mating of the connector jack 405.

[0137] The receiving groove 239 can open from the first surface 23b, the second surface 23c, or the side surface 23a of the connector 23. Since the first surface 23b and the second surface 23c of the connector 23 have relatively larger areas, the receiving groove 239 can optionally open from the first surface 23b or the second surface 23c of the connector 23. Furthermore, when the first surface 23b is provided with a boss 231 or a ridge 236, it can be exposed from the second surface 23c to ensure that the boss 231 and the ridge 236 have appropriate dimensions and ensure their respective functions.

[0138] The depth H2 of the receiving groove 239 is greater than the diameter of the wire 20. Optionally, in a cross-section perpendicular to the length of the connector 23, the covering portion 220 partially covers the surface of the wire 20. That is, the covering portion 220 partially surrounds the wire 20 rather than completely surrounding it. This can ensure a sealing effect while saving space in the thickness direction of the connector 23, thereby facilitating miniaturization. Furthermore, in a cross-section perpendicular to the length of the connector 23, the covering portion 220 covers at least 50% of the outer contour of the cross-section of the wire 20 to ensure a sealing effect. It is understood that in other embodiments, the covering portion 220 can also completely surround the outside of the wire 20 to further enhance waterproof performance.

[0139] It is understood 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 faces along the length direction of the connector 23), the width W3 (referring to the maximum distance between the two side faces 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 ridge 236 usually have a very small overall volume, and the size of the overall volume of the connector 23 has little effect, and does 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 22 covering the outside of the connector 23 becomes thinner, and the connector 23 is easy to leak out of the outer skin 22; if the volume of the connector 23 is too small, it is easy to lead to insufficient overall strength of the connector 23 and easy to break. The volume range of the connector 23 is set to 20-80mm. 3 , which is beneficial to ensure 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 to 70 mm 3 , further optional 40 ~ 50mm 3 , to further ensure the effect.

[0140] In some embodiments, connector 23 is made of metal and has a mass range of 1.5-5g. Excessively heavy weight increases the overall weight of the headset, affecting wearing comfort. Excessively light weight reduces the overall strength of connector 23, hindering reliable connection. Setting the mass range to 1.5-5g helps ensure that connector 23 has an appropriate mass and ensures connection reliability. Optionally, connector 23 can have a mass of 2-4g, and even more preferably, 2.5-3.5g, to further ensure effectiveness.

[0141] 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 to 0.4. If the ratio is too large, the mass of the connector 23 will be too heavy, increasing the weight of the entire headset and affecting wearing comfort. If the ratio is too small, the connector 23 will be too light, and its overall strength will be reduced, which is not conducive to connection reliability. 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 appropriately positioned, improving wearing comfort and helping to ensure the strength of the connector 23. Furthermore, the ratio of the mass of the connector 23 to the back hanger 2 can be 0.25 to 0.35, and even more preferably 0.27 to 0.33, to further ensure the effect.

[0142] The elastic metal wire 21 is connected to the connector 23, and is inserted into the interior of the connector 23 and fixed to the connector 23. For example, a connection hole 234 extending along the length of the connector 23 can 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 of the connector 23, the ratio of the projected area of ​​the elastic metal wire 21 to the projected area of ​​the connector 23 on the same plane perpendicular to the length 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, and the wearing experience is more painful. In addition, 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 it is 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.

[0143] 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 Figure 23 and Figure 24As shown, the end of the elastic wire 21 protrudes from the end surface 23d of the connector 23. During the production process, the exposed portion of the elastic wire 21 can be embedded in the mold, forming a precise positioning, thereby facilitating the positioning of the elastic wire 21 during mold forming and improving dimensional accuracy. Optionally, the length L7 of the elastic wire 21 protruding from the end surface 23d of the connector 23 is 0.5 to 2 mm. If the length L7 is too long, the elastic wire 21 itself will be twisted and less straight during production, making it difficult to fit into the mold positioning slot, which is not conducive to mold positioning. If the length L7 is too short, the contact area between the elastic wire 21 and the mold positioning slot is small, making it easy for the wire 21 to pop out, which is also not conducive to mold positioning. Furthermore, the length L7 can be 0.6 to 1.2 mm, and even more preferably 0.7 to 0.9 mm, to ensure that the elastic wire 21 can effectively position the mold.

[0144] In some embodiments, the connector 23 can be independently molded, and the elastic wire 21 is fixed to the connector 23 by riveting. In other embodiments, the elastic wire 21 is embedded while the connector 23 is being molded, and the connector 23 is directly molded on the elastic wire 21 by an injection molding process. For example, when the connector 23 is made of metal, the injection molding process may be die casting, and when the connector 23 is made of plastic, the injection molding process may be injection molding.

[0145] After the connector 23 and the elastic metal wire 21 are connected and formed, the wire 20 is passed through the connector 23. In some embodiments, the receiving groove 239 extends through both ends of the connector 23 in the longitudinal direction, making it more convenient to pass the wire 20 through. In other embodiments, the connector 23 also includes a wire threading hole that is connected to the receiving groove 239 and is coaxial with the receiving groove 239. The cross-section of the wire threading hole is a closed hole, for example, a circular hole that is adapted to fit the wire 20. Compared to a structure in which the connector 23 is provided with a wire threading hole that connects both ends of the length of the connector 23 for passing the wire 20, the structure in which the receiving groove 239 and the wire threading hole are combined has a relatively shorter length of the wire threading hole, making it easier for the wire 20 to pass through the connector 23. The size of the receiving groove 239 can be made larger than the cross-sectional size of the hole section for passing the wire, thereby further facilitating the passing of the wire 20.

[0146] The cross-sectional shape of the portion of the elastic wire 21 located within the connector 23 can be circular or flat. Flat shapes include, but are not limited to, rectangular or elliptical. The cross-sectional shape can be determined based on the bonding strength between the connector 23 and the elastic wire 21. When the bonding strength is sufficient, the portion of the elastic wire 21 located within the connector 23 can have a circular cross-sectional shape, which provides good strength, requires no additional processing, and is relatively low in cost. When the bonding strength is insufficient, to enhance the secure connection between the elastic wire 21 and the connector 23, at least a portion of the cross-sectional shape of the portion of the elastic wire 21 located within the connector 23 can be flattened to further enhance the secure connection.

[0147] 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.

[0148] The above is only a specific implementation of the present invention, and any improvements made based on the concept of the present invention are considered to be within the scope of protection of the present invention.

Claims

1. A head-mounted sound device, characterized in that: It comprises a rear hanging (2), wherein the rear hanging (2) is symmetrically arranged with a symmetry plane (2a); The rear hanging (2) comprises a conductive wire (20), an elastic metal wire (21), and an outer skin (22) covering the conductive wire (20) and the elastic metal wire (21); The outer skin (22) comprises a first curved portion (2b) and two second curved portions (2c) located at both ends of the first curved portion (2b), wherein the first curved portion (2b) is in an arc shape, and the second curved portion (2c) is in a curved shape that bends toward the symmetry plane (2a).

2. The head-mounted sound device according to claim 1, wherein When the head-mounted sound-generating device is in a natural state of not being worn, the diameter of the first curved portion (2b) ranges from 80 to 120 mm.

3. The head-mounted sound device according to claim 2, wherein: The diameter of the first curved portion (2b) ranges from 90 to 110 mm.

4. The head-mounted sound device according to claim 3, wherein: The diameter of the first curved portion (2b) ranges from 95 to 105 mm.

5. The head-mounted sound device according to claim 1, wherein: When the head-mounted sound-emitting device is in a natural state of not being worn, the central angle α1 of the first curved portion (2b) is 100° to 180°.

6. The head-mounted sound device according to claim 5, wherein: The central angle α1 of the first curved portion (2b) is 110° to 150°.

7. The head-mounted sound device according to claim 6, wherein: The central angle α1 of the first curved portion (2b) is 115° to 125°.

8. The head-mounted sound device according to claim 5, wherein: The central angle α1 of the first curved portion (2b) is less than 180°; When the head-mounted sound-emitting device is in a natural state where it is not worn, the plane where the center line of the portion of the elastic metal wire (21) corresponding to the first curved portion (2b) lies is the reference plane (B), and the plane passing through the center of the first curved portion (2b) and perpendicular to the reference plane (B) is the reference plane (2f). The head-mounted sound-emitting device is symmetrical about the symmetry plane (2a), and the two ends of the second curved portion (2c) are respectively located on both sides of the reference plane (2f), and the spacing D6 between the portions of the two second curved portions (2c) located at the reference plane (2f) along the width direction of the head-mounted sound-emitting device is greater than the spacing between their ends along the width direction of the head-mounted sound-emitting device.

9. The head-mounted sound device according to claim 1, wherein: The second curved portion (2c) is in the shape of a curve with a changing curvature.

10. The head-mounted sound device according to claim 1, wherein: The ratio of the length of the first curved portion (2b) to the length of the outer skin layer (22) is 0.4 to 0.

6.

11. The head-mounted sound device according to claim 10, wherein: The ratio of the length of the first curved portion (2b) to the length of the outer skin layer (22) is 0.45 to 0.

55.

12. The head-mounted sound device according to claim 11, wherein: The ratio of the length of the first curved portion (2b) to the length of the outer skin layer (22) is 0.47 to 0.

53.

13. The head-mounted sound device according to claim 1, wherein: When the head-mounted sound-generating device is in a natural state of not being worn, the ratio of the spacing distance D1 between the two ends of the outer skin layer (22) to the diameter of the first curved portion (2b) is in the range of 0.5 to 1.

2.

14. The head-mounted sound device according to claim 13, wherein: The ratio of the spacing distance D1 to the diameter of the first curved portion (2b) ranges from 0.6 to 0.

9.

15. The head-mounted sound device according to claim 14, wherein: The ratio of the spacing distance D1 to the diameter of the first curved portion (2b) ranges from 0.7 to 0.

8.

16. The head-mounted sound device according to any one of claims 1 to 15, wherein: The material of the outer skin layer (22) is silicone, TPU, TPE or rubber.

17. The head-mounted sound generating device according to any one of claims 1 to 15, wherein: The outer skin layer (22) is made of silicone rubber, and the Shore A hardness of the silicone rubber is 40° to 80°.

18. The head-mounted sound generating device according to claim 17, wherein: The Shore A hardness of the silica gel is 50° to 70°.

19. The head-mounted sound device according to claim 18, wherein: The Shore A hardness of the silica gel is 55° to 65°.

20. The head-mounted sound generating device according to any one of claims 1 to 15, wherein: It also includes: Two sound-producing units (10); Two functional compartments (4), each of which is used to accommodate a control circuit board and / or a battery, the rear hanging (2) being connected between the two functional compartments (4), and the second curved portion (2c) of the rear hanging (2) being connected to the functional compartments (4); and An ear hook (3), wherein the sound-generating unit (10) and the functional compartment (4) are connected via the ear hook (3).

21. The head-mounted sound device according to claim 20, wherein: The rear hanger (2) further comprises a connector (23) connected to the functional compartment (4); the connector (23) is provided at the end of the second curved portion (2c), is connected to the elastic metal wire (21), and is made of metal material.

22. The head-mounted sound device according to claim 21, wherein: The head-mounted sound-emitting device is symmetrical about a symmetry plane (2a). When viewed from above, the two functional chambers (4) extend away from the first curved portion (2b) and approach the symmetry plane (2a). An angle α2 between a contour line (4b) of an inner side surface of the functional chamber (4) and the symmetry plane (2a) is 15° to 60°.

23. The head-mounted sound generating device according to claim 22, wherein: The angle α2 is 20° to 40°.

24. The head-mounted sound generating device according to claim 23, wherein: The angle α2 is 25° to 30°.

25. The head-mounted sound generating device according to claim 20, wherein: The effective length of the rear hanger (2) is 170 to 220 mm, and in the side view direction of the head-mounted sound-emitting device, the distance D9 between the rear end point of the rear hanger (2) and the highest point of the inner contour of the ear hanger (3) along the length direction of the head-mounted sound-emitting device is 100 to 140 mm.

26. The head-mounted sound device according to claim 25, wherein: The effective length of the rear hanging (2) is 180-210 mm, and the distance D9 is 105-130 mm.

27. The head-mounted sound generating device according to claim 26, wherein: The effective length of the rear hanging (2) is 195-205 mm, and the distance D9 is 110-120 mm.

28. The head-mounted sound device according to claim 20, wherein: The sound-generating unit (10) comprises a housing component (102) and a bone conduction sound-generating device (100) disposed in the housing component (102).

29. The head-mounted sound device according to claim 28, wherein: The sound-generating unit (10) further comprises an air-conduction sound-generating device (101) disposed within the housing assembly (102); the housing assembly (102) comprises a proximal end (1020) close to the human ear when the head-mounted sound-generating device is worn; the proximal end (1020) is provided with a sound outlet (1021) for emitting sound from the air-conduction sound-generating device (101).

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