Ear cuff type earphones

Abstract

The ear cuff earphone (10) includes a sound generating unit (11), a contact unit (12), and an ear hook (13), and the ear hook (13) is configured to connect the sound generating unit (11) and the contact unit (12) by bypassing the user's antihelix (105) and helix (107). The ear hook (13) has a first plane of symmetry (S1), the housing is projected onto the first plane of symmetry (S1) to form a first projection (11'), the contact unit (12) is projected onto the first plane of symmetry (S1) to form a second projection (12'), and the ear hook (13) is projected onto the first plane of symmetry (S1) to form a third projection (13'). The first projection (11') and the second projection (12') have a shortest connecting line (O1O2) or a common tangent point, and the midpoint or common tangent point of the shortest connecting line (O1O2) is set as the first characteristic point (O), and the point on the inner contour curve of the third projection (13') that is farthest from the first characteristic point (O) is set as the second characteristic point (C). By designing the distance between the first characteristic point (O) and the second characteristic point (C), the ear hook (13) can bypass the ears of a relatively large number of users and is suitable for users with different ear dimensions, and the ear hook (13) has an appropriate dimension, avoiding the problem of unstable clamping.

Description

[Technical Field]

[0001] The present specification relates to the technical field of acoustics, and in particular to ear cuff type earphones.

[0002] [Incorporated by reference] This application claims priority from Chinese Application No. 202311701969.7, filed on December 11, 2023, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] Earphones are widely used in people's daily lives and can be used in combination with electronic devices such as mobile phones and computers to provide users with audio playback functions. Ear cuff earphones are a novel type of earphone that typically has a small volume and can be clipped onto a user's helix. The ear cuff earphones do not block the ear canal, ensuring safety in outdoor scenarios and offering better wearing comfort than canal-type earphones. Ear cuff earphones are generally clipped onto a user's helix, but different users may have different earpiece dimensions. Therefore, to avoid the ear cuff earphones pressing against the user's helix when worn, and to make ear cuff earphones more suitable for a wider range of people and improve wearing comfort, it is necessary to design an ear hook shape for the ear cuff earphones.

[0004] Therefore, it is desirable to provide an ear cuff-type earphone that can be designed with an ear hook curve to avoid pressing on the user's earlobe when worn, improving wearing comfort and allowing it to be used by users with different ear dimensions. Summary of the Invention [Means for solving the problem]

[0005] An ear cuff type earphone according to an embodiment of the present specification includes a housing in which a receiving cavity is installed, a sound generating assembly housed in the receiving cavity, and a sound emission hole located in the housing and configured to emit sound generated by the sound generating assembly, and further includes a sound generating unit located in the concha cavity of a user and configured to contact an inner wall of the concha cavity, a contact unit configured to contact the back of the user's ear, and an ear hook configured to be connected to the sound generating unit and the contact unit while bypassing the antihelix and helix of the user. , wherein the ear hook has a first plane of symmetry, the housing is projected onto the first plane of symmetry to form a first projection, the abutment portion is projected onto the first plane of symmetry to form a second projection, and the ear hook is projected onto the first plane of symmetry to form a third projection, the third projection includes an inner contour curve, a shortest connecting line is defined between the first projection and the second projection, a midpoint of the shortest connecting line is defined as a first feature point, a point on the inner contour curve that is farthest from the first feature point is defined as a second feature point, and a distance between the first feature point and the second feature point is 16 mm to 20 mm.

[0006] An ear cuff type earphone according to an embodiment of the present specification includes a housing in which an accommodating cavity is installed, a sound generating assembly accommodated in the accommodating cavity, and a sound emission hole located in the housing and configured to emit sound generated by the sound generating assembly. The ear cuff type earphone also includes a sound generating unit located in a user's concha cavity and configured to contact an inner wall of the concha cavity, a contact part configured to contact a back of the user's ear, and an ear hook configured to be connected to the sound generating unit and the contact part while bypassing the user's antihelix and helix, wherein the ear hook has a first symmetry plane, and the housing has a first symmetry plane. the abutment portion is projected onto the first symmetry plane to form a second projection, the ear hook is projected onto the first symmetry plane to form a third projection, the third projection includes an inner contour curve, the first projection and the second projection are in contact, the first projection and the second projection have a first common tangent between the first projection and the second projection, the first common tangent is tangent to both the first projection and the second projection at a first tangent point, the first tangent point is a first feature point, a point on the inner contour curve farthest from the first feature point is a second feature point, and the distance between the first feature point and the second feature point is 16.5 mm to 20.5 mm.

[0007] The present specification will be further illustrated by exemplary embodiments, which are not limiting and will be described in detail with reference to the drawings, in which like reference numerals indicate like structures. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of an exemplary user's ear in accordance with some embodiments of the present application. [Figure 2] FIG. 1 is a schematic diagram of an external profile of an example earphone in accordance with some embodiments of the present disclosure. [Figure 3A] 1A-1C are schematic views of an example earphone according to some embodiments of the present disclosure when clamped to ear portions of different sizes. [Figure 3B]1A-1C are schematic views of an example earphone according to some embodiments of the present disclosure when clamped to ear portions of different sizes. [Figure 4] 1 is a schematic diagram of a projection of an exemplary earphone onto a first plane of symmetry in accordance with some embodiments of the present disclosure. FIG. [Figure 5] 1 is a schematic diagram of another view of an exemplary ear hook in accordance with some embodiments herein. FIG. [Figure 6] FIG. 10 is a schematic diagram of a projection onto a first plane of symmetry of another exemplary earphone in accordance with some embodiments of the present disclosure. [Figure 7] FIG. 1 is a schematic diagram of an exemplary internal structure of an ear hook according to some embodiments herein. [Figure 8A] FIG. 1 is a schematic diagram of an example earphone in a first stable position according to some embodiments herein. [Figure 8B] FIG. 1 is a schematic diagram of an example earphone in a second stable position according to some embodiments herein. [Figure 9] 1 is a schematic diagram of an exemplary bistable structure according to some embodiments herein. DETAILED DESCRIPTION OF THE INVENTION

[0009] In order to more clearly explain the technical means of the embodiments of the present specification, the drawings necessary for the description of the embodiments will be briefly described below. Obviously, the drawings described below are only a part of the examples or embodiments of the present specification, and those skilled in the art can apply the present specification to other similar scenarios based on these drawings without any creative effort. Unless otherwise clear from the context or described otherwise, the same symbols in the drawings represent the same structures or operations.

[0010] It should be understood that the terms "system," "device," "unit," and / or "module" used herein are ways of distinguishing between various levels of assemblies, elements, components, parts, or structures. However, other terms may be used in place of the above terms if they achieve the same purpose.

[0011] As used herein and in the claims, unless the context clearly dictates otherwise, terms such as "a," "one," "one kind," and / or "the" do not specifically refer to the singular but may include the plural. In general, the terms "comprise" and "containing" merely indicate the inclusion of explicitly identified steps and elements, and these steps and elements are not an exclusive listing, and a method or apparatus may include other steps or elements.

[0012] FIG. 1 is a schematic diagram of an exemplary user's ear in accordance with some embodiments of the present application.

[0013] As shown in FIG. 1 , ear portion 100 may include an ear canal opening 101, a concha cavity 102, a concha navicularis 103, a triangular fossa 104, an antihelix 105, a scapha 106, a helix 107, a lobe 108, and a tragus 109. In some embodiments, the auricle (also called the pinna) may refer to other parts of the outer ear in ear portion 100 other than ear canal opening 101. For example, as shown in FIG. 1 , the pinna may include a concha cavity 102, a concha navicularis 103, a triangular fossa 104, an antihelix 105, a scapha 106, a helix 107, a lobe 108, and a tragus 109. In some embodiments, one or more portions of ear portion 100 may provide support and stability for an audio device (e.g., an earphone). In some embodiments, the external auditory canal opening 101, the concha cavity 102, the concha navicularis 103, and the triangular fossa 104 have certain depths and volumes in three-dimensional space, which can meet the needs of wearing an audio device. For example, an audio device (e.g., an in-ear earphone) may be fitted to the external auditory canal opening 101. In some embodiments, the audio device may be fitted to other parts of the ear 100 (i.e., the pinna) other than the external auditory canal opening 101. For example, the audio device may be fitted to parts such as the concha navicularis 103, the triangular fossa 104, the antihelix 105, the scapha 106, the helix 107, or a combination thereof. In some embodiments, the audio device may be fitted to parts such as the user's earlobe 108 to improve comfort and reliability when wearing the audio device. By implementing the wearing of the audio device and sound propagation through a portion of the ear unit 100 other than the ear canal opening 101 (i.e., the pinna), the user's ear canal opening 101 can be "opened" and the impact of the audio device on the user's ear health can be reduced. When a user wears the audio device on the road, the audio device does not block the user's ear canal opening 101, allowing the user to hear sounds from the audio device as well as sounds from the environment (e.g., horns, bicycle bells, voices of people around, traffic control, etc.), thereby reducing the likelihood of traffic accidents. For example, when a user wears the audio device, all or part of the structure of the audio device may be located in front of the tragus 109.Also, for example, when a user wears an acoustic device, the entire or partial structure of the acoustic device may contact the upper part of the ear canal opening 101 (e.g., the location of one or more parts such as the tragus 109, the concha navicularis 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, and the helix 107). Furthermore, for example, when a user wears an acoustic device, the entire or partial structure of the acoustic device may be located within one or more parts of the ear (e.g., the concha cavity 102, the concha navicularis 103, and the triangular fossa 104).

[0014] The above description of the ear unit 100 is for illustrative purposes only and is not intended to limit the scope of the present application. Those skilled in the art may make various changes and modifications based on the description of the present application. For example, the structure, shape, size, thickness, etc. of one or more parts of the ear unit 100 may differ depending on the user. Also, for example, some structures of the acoustic device may cover part or all of the ear canal opening 101. These changes and modifications remain within the scope of protection of the present application.

[0015] Because there may be individual differences among different users, the ear unit 100 may have different shapes, sizes, and other dimensions. For ease of explanation and understanding, unless otherwise specified, this specification mainly uses an ear model having a "standard" shape and dimensions as a reference, and further describes the wearing method of the acoustic device in the ear model in different embodiments. For example, a simulator including a head and its (left and right) ear units 100 manufactured in accordance with ANSI:S3.36, S3.25, and IEC:60318-7 standards, such as GRAS45BCKEMAR, can be used as a reference for wearing the acoustic device, and represents a scenario in which most users normally wear an acoustic device. In this specification, descriptions such as "worn by a user," "in a wearing state," and "in a wearing state" may refer to the acoustic device described in this specification being worn in the ear unit 100 of the simulator. Naturally, taking into consideration the individual differences among different users, differentiated designs can be made based on ear units 100 with different shapes and dimensions for the structure, shape, size, thickness, etc. of one or more parts of the ear unit 100, and these differentiated designs may be adapted to different ear units 100 by having characteristic parameters of one or more parts of the acoustic device have different ranges of values. Note that the "non-worn state" is not limited to a state in which the acoustic device is not worn on the user's ear unit 100, but also includes a state in which the acoustic device is not deformed by an external force, and the "worn state" is not limited to a state in which the acoustic device is worn on the user's ear unit 100, but also includes a state in which each structure of the acoustic device (e.g., abutment portion, ear hook, sound generating unit, housing, etc.) is deployed in the same state as when worn (e.g., a certain distance is maintained between each structure), which can also be considered a worn state.

[0016] In fields such as medicine and anatomy, three basic cutting planes of the human body—the sagittal plane, the coronal plane, and the horizontal plane—and three basic axes—the sagittal axis, the coronal axis, and the vertical axis—can be defined. The sagittal plane refers to a cutting plane perpendicular to the ground along the front-to-back direction of the body, dividing the body into two parts, the left and the right. The coronal plane refers to a cutting plane perpendicular to the ground along the left-to-right direction of the body, dividing the body into two parts, the front and the back. The horizontal plane refers to a cutting plane parallel to the ground along the up-down direction of the body, dividing the body into two parts, the top and the bottom. Accordingly, the sagittal axis refers to an axis perpendicular to the coronal plane along the front-to-back direction of the body, the coronal axis refers to an axis perpendicular to the sagittal plane along the left-to-right direction of the body, and the vertical axis refers to an axis perpendicular to the horizontal plane along the up-to-down direction of the body. Furthermore, the "front side of the pinna" described in this application is a concept that contrasts with the "rear side of the pinna" or "back side of the pinna," the former referring to the side of the pinna facing away from the head, and the latter referring to the side of the pinna facing towards the head, both of which are relative to the user's pinna. Looking at the pinna of the simulator along the coronal axis of the human body, a schematic diagram of the front contour of the pinna is obtained as shown in Figure 1.

[0017] The above description of the ear part 100 is for illustrative purposes only and is not intended to limit the scope of the present application. Those skilled in the art can make various changes and modifications based on the description of the present application. For example, some structures of the acoustic device may cover part or all of the ear canal opening 101. These changes and modifications still fall within the scope of protection of the present application.

[0018] Fig. 2 is a schematic diagram of the external contour of an exemplary earphone according to some embodiments of the present specification, Fig. 3A and Fig. 3B are schematic diagrams of wearing an exemplary earphone according to some embodiments of the present specification when clipped to ear parts of different sizes, Fig. 4 is a schematic diagram of an exemplary earphone according to some embodiments of the present specification projected onto a first symmetry plane, Fig. 5 is a schematic diagram of an exemplary ear hook according to some embodiments of the present specification from another perspective, and Fig. 6 is a schematic diagram of another exemplary earphone according to some embodiments of the present specification projected onto a first symmetry plane. Hereinafter, ear cuff-type earphones will be described as shown in Figs. 1 to 6.

[0019] As shown in FIGS. 2 , 3A, and 3B , in some embodiments, the ear cuff-type earphone 10 mainly includes an audio-generating unit 11, a contact unit 12, and an ear hook 13. The audio-generating unit 11 is inserted into the user's concha 102 and is adapted to contact the inner wall of the concha 102, the contact unit 12 is adapted to contact the back of the user's ear, and the ear hook 13 is adapted to connect the audio-generating unit 11 and the contact unit 12. The earphone 10 is clamped by the audio-generating unit 11 and the contact unit 12 contacting the ear. In some embodiments, the audio-generating unit 11 is an audio playback device that converts electrical signals into acoustic signals and plays them for the user. The contact unit 12 forms a clamping state with the audio-generating unit 11 so that the entire earphone 10 is clamped and worn near the user's helix. In some embodiments, the contact unit 12 can be used as a battery compartment for mounting a battery or other components. In some alternative embodiments, the abutment portion 12 is not used as a battery compartment, and the battery may be attached to the sound generating portion 11 .

[0020] In some embodiments, the sound generating unit 11 includes a housing (not shown) and a sound generating assembly (not shown). The housing has a cavity (not shown) in which the sound generating assembly is accommodated. The sound generating assembly is a module capable of converting an electrical signal into an acoustic signal, such as a speaker. In some embodiments, the sound generating assembly may include one or more speakers. In some embodiments, the housing may have a sound output hole 111 configured to emit sound generated by the sound generating assembly. In some embodiments, as shown in FIGS. 3A and 3B , in a worn state, the sound output hole 111 may be positioned toward the user's ear canal opening 101, thereby directly transmitting sound generated by the sound generating assembly to the ear canal opening 101 and improving the listening experience of the user's ear canal opening 101.

[0021] 3A and 3B, different users may have different ear sizes, for example, the helix of the ear of the user shown in Fig. 3A is relatively large, and the helix of the ear of the user shown in Fig. 3B is relatively small. In order to make the earphone 10 suitable for users with different ear sizes and to prevent the ear loop 13 from pressing the user's helix when worn, the curve of the ear loop 13 can be designed.

[0022] In some embodiments, the ear hook 13 may be symmetrically positioned, and the ear hook 13 has a first plane of symmetry S1. In some embodiments, in the worn state shown in FIGS. 3A and 3B, the first plane of symmetry S1 may be parallel to the horizontal plane (i.e., the plane of the paper shown in FIGS. 3A and 3B). In some embodiments, the first plane of symmetry S1 may be located at the midpoint in the width direction of the ear hook 13. The first plane of symmetry S1 may divide the ear hook 13 into two symmetrical portions located on either side of the first plane of symmetry S1 along the length direction of the ear hook 13 (i.e., the direction extending from the end of the ear hook 13 connected to the sound generating unit 11 to the end of the ear hook 13 connected to the abutting unit 12).

[0023] In some embodiments, the housing of the sound-generating unit 11 forms a first projection 11' on the first plane of symmetry S1, the abutment unit 12 forms a second projection 12' on the first plane of symmetry S1, and the ear hook 13 forms a third projection 13' on the first plane of symmetry S1. In some embodiments, the first projection 11' has a lowest point A, the second projection 12' has a lowest point B, the first projection 11' and the second projection 12' have a common tangent line L1 passing through points A and B, and the tangent line L1 is tangent to the first projection 11' at point A, and the tangent line L1 is tangent to the second projection 12' at point B.

[0024] For ease of understanding, the following description will be given taking as an example a case where the earphone 10 is placed on a horizontal plane and the first plane of symmetry S1 is perpendicular to the horizontal plane. The contact point between the sound generating unit 11 and the horizontal plane is point A, and the contact point between the contact unit 12 and the horizontal plane is point B. That is, the sound generating unit 11 contacts the horizontal plane at point A, and the contact unit 12 contacts the horizontal plane at point B. In this case, the straight line L1 on which points A and B are located in Figures 4 and 6 can be considered as a projection of the horizontal plane onto the first plane of symmetry S1, and the straight line L1 is tangent to the first projection 11' at point A and to the second projection 12' at point B. The first plane of symmetry S1 is parallel to the plane on which the paper shown in Figures 4 and 6 is located.

[0025] In some embodiments, the third projection 13' includes an inner contour curve and an outer contour curve. Here, the inner contour curve corresponds to the contour of the side of the ear hook 13 closest to the helix when worn, and the outer contour curve corresponds to the contour of the side of the ear hook 13 away from the helix when worn. In the first projection 11', point A is the boundary point. The portion connected to the inner contour curve of the third projection 13' is the inner contour of the first projection 11', and the portion connected to the outer contour curve of the third projection 13' is the outer contour of the first projection 11'. In the second projection 12', point B is the boundary point. The portion connected to the inner contour curve of the third projection 13' is the inner contour of the second projection 12', and the portion connected to the outer contour curve of the third projection 13' is the outer contour of the second projection 12'. In some embodiments, the inner contour of the first projection 11', the inner contour of the third projection 13', and the inner contour of the second projection 12' are connected in sequence with points A and B as boundaries to form the inner contour of the earphone 10, and the outer contour of the first projection 11', the outer contour of the third projection 13', and the outer contour of the second projection 12' are connected in sequence to form the outer contour of the earphone 10.

[0026] As shown in FIG. 4, in some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure (as shown in FIG. 4), a shortest connecting line exists between the first projection 11′ and the second projection 12′. The shortest connecting line is a line connecting the two closest points between the first projection 11′ and the second projection 12′. In some embodiments, the two end points of the shortest connecting line are located on the inner contour of the first projection 11′ and the inner contour of the second projection 12′, respectively. That is, the shortest connecting line between the first projection 11′ and the second projection 12′ is located between the inner contour of the first projection 11′ and the inner contour of the second projection 12′. In some embodiments, a point O1 is taken on the inner contour of the first projection 11′, and a tangent line l1 passing through point O1 on the inner contour of the first projection 11′ is determined. A point O2 is taken on the inner contour of the second projection 12′, and a tangent line l2 passing through point O2 on the inner contour of the second projection 12′ is determined. If the tangent line l1 is parallel to the tangent line l2 and the line connecting points O1 and O2 is perpendicular to the tangent lines l1 and l2, then the line connecting points O1 and O2 is the shortest connecting line between the inner contour of the first projection 11' and the inner contour of the second projection 12', i.e., the shortest connecting line between the first projection 11' and the second projection 12'.

[0027] In some embodiments, the shortest connecting line between the first projection 11′ and the second projection 12′ may be determined by a tool, program, etc. For example, when the contour curve parameters of the earphone 10 (e.g., a simulation curve function of the inner contour of the earphone 10, a simulation curve function of the outer contour of the earphone 10, etc.) are input, information (e.g., a position, an end point, etc.) of the shortest connecting line between the first projection 11′ and the second projection 12′ can be output by a corresponding tool, program, etc.

[0028] In some embodiments, when the sound generating unit 11 and the contact portion 12 have a non-contact structure, as shown in Fig. 4, the shortest connecting line O1O2 has a midpoint O, which is set as a first feature point. The position of the first feature point O may be used to reflect the fit area between the sound generating unit 11 and the contact portion 12 and the user's ear in a worn state, thereby reflecting the wearing state of the earphone 10, making it easy to determine the positions and orientations of the sound generating unit 11 and the contact portion 12 in a worn state, and facilitating the subsequent design of the ear hook 13.

[0029] In some other embodiments, when the sound-generating unit 11 and the abutting unit 12 have a contact structure, as shown in FIG. 6 , a fit area or a fit point is provided between the first projection 11′ and the second projection 12′, and the center point (e.g., centroid, center of area, etc.) of the fit area or the fit point may be defined as the first feature point O. In some embodiments, when the sound-generating unit 11 contacts the abutting unit 12, the inner contour of the first projection 11′ and the inner contour of the second projection 12′ fit together. At this time, a common tangent line l3 may be determined between the inner contour of the first projection 11′ and the inner contour of the second projection 12′, and the common tangent line l3 is tangent to both the inner contour of the first projection 11′ and the inner contour of the second projection 12′ at a first tangent point O. The point O may be defined as the first feature point. In some embodiments, when the contact area between the sound-generating unit 11 and the abutting unit 12 is a surface, the centroid of the projection of the contact surface onto the first symmetry plane S1 is defined as the first feature point O. In some embodiments, when the sound generating unit 11 and the abutment unit 12 have a contact structure, the side of the first projection 11' away from the third projection 13' and the side of the second projection 12' away from the third projection 13' have a common tangent (i.e., common tangent L1), the second tangent point between the common tangent L1 and the first projection 11' is point A, the third tangent point between the common tangent L1 and the second projection 12' is point B, and the line connecting point A and point B (i.e., connecting line AB, straight line L1) may be taken as the reference connecting line L1.

[0030] In some embodiments, when the sound generating unit 11 and the contact portion 12 have a non-contact structure, the end point of the first projection 11' of the shortest connecting line O1O2 is point O1. In the worn state, the point on the sound generating unit 11 corresponding to point O1 is covered by the cavity of the concha, that is, the point on the sound generating unit 11 corresponding to point O1 is located near the fit point of the sound generating unit 11 with the cavity of the concha of the user in the worn state. In other words, the point on the sound generating unit 11 corresponding to point O1 (and the area around it) engages with the contact portion 12, thereby realizing clamping of the earphone 10.

[0031] Accordingly, when the sound generating unit 11 and the contact portion 12 have a contact structure, in the worn state, the point on the sound generating unit 11 corresponding to the first feature point O is covered by the cavity of the concha, i.e., the point on the sound generating unit 11 corresponding to point O is located near the fit point of the sound generating unit 11 with the cavity of the concha of the user in the worn state. In other words, the sound generating unit 11 realizes clamping of the earphone 10 by engaging the point corresponding to point O (and the area nearby) with the contact portion 12.

[0032] In some embodiments, the inner contour curve of the third projection 13′ has at least one point C that is the farthest from the first feature point O. In some embodiments, if there are multiple points that are the farthest from the first feature point O, the point among these farthest points that is closest to the second projection 12′ of the abutting portion 12 may be set as the second feature point C. The second feature point C may be determined by a tool, program, or the like. For example, when contour curve parameters of the earphone 10 (e.g., a simulation curve function of the inner contour of the earphone 10, a simulation curve function of the outer contour of the earphone 10, etc.) are input, information about the first feature point O can be determined using a corresponding tool, program, etc., and information about the second feature point C (e.g., its position) can be output.

[0033] 3A, 3B, 4, and 6, in a worn state, point O is located near the contact point between the sound generating unit 11 and the cavity of the concha, the helix is ​​located within the area surrounded by the inner contour of the earhook 13, and the helix is ​​basically located in the area on the inner contour of the earhook 13 that is farthest from point O. In order to prevent the earphone 10 from pressing or interfering with the user's ear when going around the ear, the first feature point O and the second feature point C are designed so that the earhook 13 of the earphone 10 can go around the ears of a relatively large number of users when going around the ear, making the earphone 10 suitable for a larger number of people.

[0034] If the distance between the first characteristic point O and the second characteristic point C is too small, the ear hook 13 will press against and interfere with the earlobe of many users when worn, affecting wearing comfort and clamping effect.If the distance between the first characteristic point O and the second characteristic point C is too large, the overall dimensions of the ear hook 13 will be too large, which will likely cause the earphone 10 to be clamped unstable.

[0035] In some embodiments, when the contact portion 12 and the sound generating portion 11 have a non-contact structure, the distance between the first characteristic point O and the second characteristic point C (i.e., the length of the line segment O-C shown in FIG. 4 ) may be 16 mm to 20 mm so that the ear hook 13 can circumvent a relatively large number of users' ears, and the ear hook 13 has an appropriate size to avoid unstable clamping. In some embodiments, the distance between the first characteristic point O and the second characteristic point C may be 16.5 mm to 19 mm so that the ear hook 13 can be more compatible with the sizes of more ears. In some embodiments, the distance between the first characteristic point O and the second characteristic point C may be 16.7 mm to 18 mm so that the ear hook 13 is too large to avoid unstable clamping. For example, the distance between the first characteristic point O and the second characteristic point C may be 17.0 mm.

[0036] In some embodiments, when the abutting portion 12 and the sound generating portion 11 have a contact structure, the distance between the first characteristic point O and the second characteristic point C may be 16.5 mm to 20.5 mm. For example, the distance between the first characteristic point O and the second characteristic point C may be 17.3 mm.

[0037] As shown in FIGS. 4 and 6 , in some embodiments, when the sound generating unit 11 and the contacting unit 12 are in a non-contact structure, the second feature point C and the contacting unit 12 are located on the same side as the first feature point O in the direction of the shortest connecting line O1 / O2. In some embodiments, the second feature point C may correspond to the point on the helix that is farthest from the cavity of the concha when worn. The location of the second feature point C is designed so that the portion of the earhook 13 adjacent to the contacting unit 12 changes sharply, while the portion of the earhook 13 adjacent to the sound generating unit 11 changes relatively gradually. That is, in the third projection 13′, the rate of change of the inner contour curve from the second feature point C to the second projection 12′ is significantly greater than the rate of change of the inner contour curve to the first projection 11′, resulting in an asymmetrical installation of the earhook 13. As shown in Figures 3A and 3B, the gradient of change from the cavity of the concha to the helix at the front of the auricle is significantly smaller than the gradient of change from the helix to the back of the cavity of the concha at the back of the auricle. In order to better accommodate such changes in the auricle, the earhook 13 is positioned asymmetrically, so that the earhook 13 can accommodate the changes from the helix to the back of the auricle and the changes to the cavity of the concha, thereby avoiding interference between the earhook 13 and the helix and improving the wearing comfort of the earphone 10.

[0038] In some embodiments, when the sound generating unit 11 and the contact portion 12 are in a non-contact structure, the shortest connecting line O1O2 may be parallel or substantially parallel to the AB connecting line. That is, the direction of the straight line on which the shortest connecting line O1O2 is located may be replaced with the direction on which the reference connecting line L1 is located. Accordingly, when the sound generating unit 11 and the contact portion 12 are in a contact structure, the second characteristic point C and the contact portion 12 are located on the same side as point O in the direction on which the reference connecting line L1 is located.

[0039] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure, the position and distance between the first feature point O and the second feature point C in the direction of the straight line along which the shortest connecting line O1O2 is located can be adjusted to achieve a design in which the second feature point C is offset from the first feature point O, so that the earhook 13 can accommodate changes from the helix to the dorsal surface of the auricle and changes to the cavity of the concha, avoiding interference between the earhook 13 and the helix and improving the wearing comfort of the earphone 10.

[0040] If the distance between the first feature point O and the second feature point C in the connecting line direction of the shortest connecting line O1O2 (i.e., the projected length of the line segment OC on the straight line on which the shortest connecting line O1O2 is located) is too large, the deviation between the second feature point C and the first feature point O is too large, and the portion of the ear hook 13 that is close to the contact portion 12, with point C as the boundary, is too small, which means that when the ear hook is worn, the portion of the ear hook 13 that is close to the contact portion 12 may interfere with the rear part of the pinna of the ear. If the distance between the first feature point O and the second feature point C in the connecting line direction of the shortest connecting line O1O2 is too small, the deviation between the second feature point C and the first feature point O is too small, and the portion of the ear hook 13 that is close to the sound generating unit 11, with point C as the boundary, is too small, which means that when the ear hook is worn, the portion of the ear hook 13 that is close to the sound generating unit 11 may interfere with the front part of the pinna of the ear. If the ear hook 13 interferes with the ear part, the wearing comfort and clamping effect of the earphone 10 will be affected.

[0041] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , the distance between the first feature point O and the second feature point C in the connecting line direction of the shortest connecting line O1O2 may be 8.2 mm to 11 mm to avoid interference between the ear hook 13 and the user's ear and improve the wearing comfort and clamping effect of the earphone 10. In some embodiments, the distance between the first feature point O and the second feature point C in the connecting line direction of the shortest connecting line O1O2 may be 8.7 mm to 10.5 mm to further reduce the possibility of interference between the ear hook 13 and the front side of the auricle. In some embodiments, the distance between the first feature point O and the second feature point C in the connecting line direction of the shortest connecting line O1O2 may be 9 mm to 10 mm to further reduce the possibility of interference between the ear hook 13 and the back side of the auricle. For example, the distance between the first feature point O and the second feature point C in the connecting line direction of the shortest connecting line O1O2 may be 9.9 mm.

[0042] 6, the distance between the first characteristic point O and the second characteristic point C in the direction along the reference connecting line L1 may be 7.5 mm to 10 mm. For example, the distance between the first characteristic point O and the second characteristic point C in the direction along the reference connecting line L1 may be 9.1 mm.

[0043] The line connecting the first characteristic point O and the second characteristic point C is defined as the first connecting line. In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4, the angle between the first connecting line O-C and the shortest connecting line O1O2 (i.e., ∠C-O2) may be 50° to 70°. By designing the angle between the first connecting line O-C and the shortest connecting line O1O2, the position of the second characteristic point C relative to the first characteristic point O can be adjusted, thereby adjusting the shape of the earhook 13 and making the earhook 13 adaptable to a greater variety of ear sizes, avoiding interference between the earhook 13 and the ear, and ensuring the earphone 10's comfortable wearing and clamping effect. In some embodiments, if the angle between the first connecting line OC and the shortest connecting line O1O2 is too large, the deviation between the second feature point C and the first feature point O is too small, and the portion of the ear hook 13 that is close to the sound generating unit 11, with point C as the boundary, is too small, which means that when worn, the portion of the ear hook 13 that is close to the sound generating unit 11 may interfere with the front portion of the pinna of the ear.If the angle between the first connecting line OC and the shortest connecting line O1O2 is too small, the deviation between the second feature point C and the first feature point O is too large, and the portion of the ear hook 13 that is close to the abutting portion 12, with point C as the boundary, is too small, which means that when worn, the portion of the ear hook 13 that is close to the abutting portion 12 may interfere with the back portion of the pinna of the ear.

[0044] To further reduce the possibility of interference between the ear hook 13 and the front side of the auricle, in some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4, the angle between the first connecting line OC and the shortest connecting line O1O2 (i.e., ∠COO2) may be 50° to 65°. In some embodiments, to further avoid interference between the ear hook 13 and the back side of the auricle, the angle between the first connecting line OC and the shortest connecting line O1O2 (i.e., ∠COO2) may be 52° to 60°. For example, the angle between the first connecting line OC and the shortest connecting line O1O2 (i.e., ∠COO2) may be 58°.

[0045] Accordingly, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the angle between the first connecting line OC and the reference connecting line L1 (angle α shown in Fig. 6) may be 45° to 60°. For example, the angle between the first connecting line OC and the reference connecting line L1 (angle α shown in Fig. 6) may be 55°.

[0046] In some embodiments, the second characteristic point C is a protruding point of the earhook 13, and stress is high at the second characteristic point C of the earhook 13. To avoid excessive stress concentration in the earhook 13 area and improve the service life of the earhook 13, it is necessary to ensure that the protrusion of the third projection 13' near the second characteristic point C is not too large. However, if the protrusion of the third projection 13' near the second characteristic point C is too small, it may affect the overall structure and dimensions of the earphone 10, cause interference between the earhook 13 and the user's ear, and affect the wearing stability of the earphone 10.

[0047] In some embodiments, to represent the degree of protrusion near the second characteristic point C of the ear hook 13, two arc segments (e.g., arc CT1 and arc CT2) with equal arc lengths are determined on both sides of the second characteristic point C, centered on the inner contour curve of the third projection 13'. The line connecting the ends of the two arc segments (e.g., arc CT1 and arc CT2) away from the second characteristic point C is designated as the connecting line T1T2, and the arc segment corresponding to the connecting line T1T2 is designated as the arc T1T2. The arc length-chord length ratio between the arc length of the arc T1T2 and the length of the connecting line T1T2 can represent the degree of curvature of the corresponding arc T1T2, thereby representing the degree of protrusion of the inner contour curve at the position corresponding to the arc T1T2.

[0048] In some embodiments, to accurately represent the degree of protrusion of the earhook 13 near the second characteristic point C of the earhook 13, points T1 and T2 need not be too close or too far from the second characteristic point C. In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4 or a contact structure as shown in FIG. 6, the arc lengths of the arcs CT1 and CT2 may be 2.5 mm to 3.5 mm. In some embodiments, to further improve the accuracy of representing the degree of protrusion of the earhook 13 near the second characteristic point C of the earhook 13, the predetermined arc length range may be 2.7 mm to 3.2 mm.

[0049] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , the arc length-chord ratio between the arc length of the arc T1T2 and the length of the connecting line T1T2 may be 1.00 to 1.10 to avoid excessive stress concentration in the earhook 13 region and ensure the wearing stability of the earphone 10. In some embodiments, the arc length-chord ratio between the arc length of the arc T1T2 and the length of the connecting line T1T2 may be 1.01 to 1.07 to further avoid excessive stress concentration in the earhook 13 region and extend the service life of the earhook 13. For example, the arc length-chord ratio between the arc length of the arc T1T2 and the length of the connecting line T1T2 may be 1.04.

[0050] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the arc length-chord ratio between the arc length of the arc T1T2 and the length of the connecting line T1T2 may be 1.03 to 1.12. For example, the arc length-chord ratio between the arc length of the arc T1T2 and the length of the connecting line T1T2 may be 1.06.

[0051] 4 and 6, in some embodiments, in the perpendicular direction of the first connecting line OC, the portion of the outer contour of the earphone 10 adjacent to the first projection 11' has a first tangent line L2 parallel to the first connecting line OC, and the portion of the outer contour of the earphone 10 adjacent to the second projection 12' has a second tangent line L3 parallel to the first connecting line OC. In some embodiments, the portion of the earphone 10 between the first connecting line OC and the first tangent line L2 corresponds to the transition of the ear part from the helix to the cavity of the concha, and the portion of the earphone 10 between the first connecting line OC and the second tangent line L3 corresponds to the transition of the ear part from the helix to the dorsal surface of the pinna.

[0052] If the distance d1 between the first connecting line OC and the first tangent line L2 is too small, the earhook 13 may interfere with the front side of the auricle. If the distance d1 between the first connecting line OC and the first tangent line L2 is too large, the sound generating unit 11 may interfere with the tragus. In some embodiments, when the sound generating unit 11 and the abutting unit 12 have the contact structure shown in FIG. 6 , the distance d1 between the first connecting line OC and the first tangent line L2 may be 12 mm to 15.5 mm to minimize interference between the earphone 10 and the user's ear. In some embodiments, the distance d1 between the first connecting line OC and the first tangent line L2 may be 13 mm to 15 mm to further reduce the possibility of interference between the sound generating unit 11 and the tragus. In some embodiments, the distance d1 between the first connecting line OC and the first tangent line L2 may be 13.5 mm to 14.6 mm to further reduce the possibility of interference between the earhook 13 and the front side of the auricle. Exemplarily, the distance d1 between the first connection line OC and the first tangent line L2 may be 13.6 mm.

[0053] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in Fig. 4, the distance d1 between the first connecting line OC and the first tangent line L2 may be 13 mm to 16 mm. For example, the distance d1 between the first connecting line OC and the first tangent line L2 may be 14.4 mm.

[0054] If the distance d2 between the first connecting line OC and the second tangent line L3 is too small, the ear hook 13 may interfere with the back of the auricle. If the distance d2 between the first connecting line OC and the second tangent line L3 is too large, the contact portion 12 may interfere with the skin of the head behind the auricle, and the contact portion 12 may press excessively against the skin of the head behind the auricle.

[0055] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in FIG. 6 , the distance d2 between the first connecting line OC and the second tangent line L3 may be 10.5 mm to 13 mm to minimize interference between the earphone 10 and the user's ear and the scalp near the ear. In some embodiments, the distance d2 between the first connecting line OC and the second tangent line L3 may be 11 mm to 12.5 mm to further minimize interference between the ear hook 13 and the back of the auricle. In some embodiments, the distance d2 between the first connecting line OC and the second tangent line L3 may be 11.5 mm to 12 mm to further minimize interference between the contact unit 12 and the scalp behind the user's auricle. For example, the distance d2 between the first connecting line OC and the second tangent line L3 may be 11.6 mm.

[0056] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in Fig. 4, the distance d2 between the first connecting line OC and the second tangent line L3 may be 10 mm to 12.5 mm. For example, the distance d2 between the first connecting line OC and the second tangent line L3 may be 11.5 mm.

[0057] The second projection 12' has a centroid point F, which is defined as the third feature point. In some embodiments, when the sound-generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4, the straight line on which the shortest connecting line O1 / O2 is located and the second projection 12' may have two intersection points, and the third feature point F may be the midpoint of these two intersection points. In some embodiments, when the sound-generating unit 11 and the contact unit 12 have a contact structure as shown in FIG. 6, when a parallel line of the reference connecting line L1 is drawn through the first feature point O, the parallel line and the second projection 12' may have two intersection points, and the third feature point F may be the midpoint of these two intersection points. In some embodiments, the centroid of the second projection 12' may be the centroid of the projection of the internal cavity of the contact unit 12 onto the first symmetry plane S1, i.e., the centroid of the internal contour of the second projection 12' shown in FIG. 4 or FIG. 6.

[0058] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4, the second feature point C is farther from the first feature point O than the third feature point F in the direction of the shortest connecting line O1O2, so that the asymmetry of the earhook 13 ensures that the earhook 13 can accommodate changes from the helix to the back of the pinna and changes to the cavity of the concha, avoiding interference between the earhook 13 and the front side of the pinna and the back side of the pinna, and improving the wearing comfort of the earphone 10.

[0059] Accordingly, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in FIG. 6, the second characteristic point C is farther from the first characteristic point O than the third characteristic point F in the direction of the reference connection line L1.

[0060] In some embodiments, if the angle (i.e., ∠COF) between the connecting line OF between the third feature point F and the first feature point O and the first connecting line OC is too large, the deviation between the second feature point C and the first feature point O is too small, and the portion of the ear hook 13 that is close to the sound generating unit 11, with point C as the boundary, is too small, meaning that when worn, the portion of the ear hook 13 that is close to the sound generating unit 11 may interfere with the front portion of the pinna of the ear. If the angle between the connecting line OF and the first connecting line OC is too small, the deviation between the second feature point C and the first feature point O is too large, and the portion of the ear hook 13 that is close to the abutting portion 12, with point C as the boundary, is too small, meaning that when worn, the portion of the ear hook 13 that is close to the abutting portion 12 may interfere with the back portion of the pinna of the ear.

[0061] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in FIG. 6 , the angle between the connecting line OF and the first connecting line OC (i.e., ∠COF) may be 45° to 65° to avoid interference between the ear hook 13 and the user's ear. In some embodiments, the angle between the connecting line OF and the first connecting line OC may be 50° to 60° to further reduce the possibility of interference between the ear hook 13 and the front side of the auricle. In some embodiments, the angle between the connecting line OF and the first connecting line OC may be 52° to 55° to further reduce the possibility of interference between the ear hook 13 and the back side of the auricle. Exemplarily, the angle between the connecting line OF and the first connecting line OC may be 53°.

[0062] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in Fig. 4, the angle between the connecting line OF and the first connecting line OC may be 42° to 62°. For example, the angle between the connecting line OF and the first connecting line OC (i.e., ∠COF) may be 50°.

[0063] In some embodiments, when a first auxiliary line L4 is drawn through the second feature point C toward the first projection 11′, a first angle between the first auxiliary line L4 and the first connecting line (i.e., the connecting line OC) has a first predetermined value range, and an intersection E between the inner contour curve of the third projection 13′ and the first auxiliary line L4 may be defined as a fourth feature point. A line CE connecting the fourth feature point E and the second feature point C is a second connecting line, and the second connecting line (i.e., the connecting line CE) is collinear with the first auxiliary line L4. In some embodiments, the fourth feature point E may be defined as a boundary point between the inner contour curve of the third projection 13′ and the inner contour of the first projection 11′. A portion of the earloop 13 corresponding to the second connecting line CE (e.g., a portion corresponding to the arc CE segment) is located away from the abutment portion 12 of the second connecting line CE to avoid interference between the earloop 13 and the antihelix and the helix.

[0064] In some embodiments, if the first angle (i.e., ∠OCE) between the second connecting line CE and the first connecting line OC is too small, interference and pressure may occur between the inner contour of the portion of the ear hook 13 corresponding to the second connecting line CE and the portion of the user's ear from the helix to the cavity of the concha. If the first angle between the second connecting line CE and the first connecting line OC is too large, the dimensions of the ear hook 13 may be too large, causing the sound generating unit 11 to interfere with the user's tragus or block the opening of the user's ear canal.

[0065] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4 , the first predetermined value range may be 30° to 40°, i.e., the first angle between the second connecting line CE and the first connecting line OC may be 30° to 40°, in order to prevent the sound generating unit 11 from blocking the user's ear canal opening and to prevent interference between the sound generating unit 11 and the tragus or the antihelix or helix. In some embodiments, the first angle between the second connecting line CE and the first connecting line OC may be 32° to 37°, in order to further prevent the sound generating unit 11 from interfering with the tragus or blocking the ear canal opening. In some embodiments, the first angle between the second connecting line CE and the first connecting line OC may be 36°, in order to further prevent interference between the sound generating unit 11 and the antihelix or helix.

[0066] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the angle between the second connecting line CE and the first connecting line may be 27° to 37°. For example, the angle between the second connecting line CE and the first connecting line may be 33°.

[0067] In some embodiments, if the distance between the fourth feature point E and the second feature point C (i.e., the length of the second connecting line CE) is too large, the dimensions of the ear hook 13 may be too large, causing the sound generating unit 11 to interfere with the user's tragus or to be too close to the ear canal opening, potentially blocking the ear canal opening. If the distance between the fourth feature point E and the second feature point C is too small, interference and pressure may occur between the inner contour of the part of the ear hook 13 corresponding to the second connecting line CE and the part of the user's ear from the helix to the cavity of the concha.

[0068] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4 , the length of the second connecting line CE may be 16 mm to 22 mm to prevent the sound generating unit 11 from blocking the user's ear canal opening and to prevent interference between the sound generating unit 11 and the tragus, antihelix, or helix. In some embodiments, the length of the second connecting line CE may be 16.5 mm to 21 mm to further prevent the sound generating unit 11 from interfering with the tragus or blocking the ear canal opening. In some embodiments, the length of the second connecting line CE may be 17 mm to 20 mm to further prevent interference between the sound generating unit 11 and the antihelix or helix. For example, the length of the second connecting line CE may be 17.8 mm.

[0069] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the length of the second connecting line CE may be 15.5 mm to 21.5 mm. For example, the length of the second connecting line CE may be 17.2 mm.

[0070] In some embodiments, the inner contour curve portion (i.e., the arc CE) of the third projection 13′ corresponding to the second connecting line CE has a first arc length, and the ratio of the first arc length to the length of the second connecting line CE may be defined as a first arc-to-chord ratio. The first arc-to-chord ratio may reflect the gentleness of the arc CE corresponding to the second connecting line CE. The larger the first arc-to-chord ratio, the greater the degree of protrusion of the arc CE corresponding to the second connecting line CE, and the larger the area within the arc CE, making it less likely that the corresponding portion of the earloop 13 will interfere with the portion of the ear from the helix to the cavity of the concha (e.g., the helix, the antihelix). The smaller the first arc-to-chord ratio, the gentler the arc CE corresponding to the second connecting line CE, and the smaller the area within the arc CE, making it more likely that the corresponding portion of the earloop 13 will interfere with the portion of the ear from the helix to the cavity of the concha (e.g., the helix, the antihelix). In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4, the first arc length / chord length ratio may be greater than 1.05 to avoid interference between the ear hook 13 and the helix or antihelix.

[0071] If the first arc length / chord length ratio is too large, the size of the earhook 13 will be too large, and the overall size of the earphone 10 will be too large, which may affect the wearing effect and reduce portability. In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4, the first arc length / chord length ratio may be less than 1.20 to optimize the overall size of the earphone 10, i.e., the first arc length / chord length ratio may be 1.05 to 1.20. In some embodiments, the first arc length / chord length ratio may be 1.08 to 1.17 to further reduce the overall size of the earphone 10. In some embodiments, the first arc length / chord length ratio may be 1.10 to 1.15 to further avoid interference between the earhook 13 and the ear portion. For example, the first arc length / chord length ratio may be 1.13.

[0072] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the first arc length / chord length ratio may be 1.10 to 1.25. For example, the first arc length / chord length ratio may be 1.14.

[0073] In some embodiments, the inner contour curve (i.e., arc CE) corresponding to the second connecting line CE may be defined as a first arc segment, where the distance from the first arc segment to the second connecting line CE is minimum at zero at the two end points (points C and E), and the distance from the first arc segment to the second connecting line CE is maximum at the vertex of the arc CE. This maximum distance can reflect the gentleness of the arc CE. If the maximum distance is too large, the arc CE will protrude too much, the dimensions of the earhook 13 will be too large, and the overall dimensions of the earphone 10 will be too large, which will affect the wearing effect and reduce portability.

[0074] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , the distance from the second connecting line CE to the first arc segment (i.e., arc CE) of the earhook 13 may be 3.4 mm or less to prevent the first arc segment of the earhook 13 from protruding too much. In some embodiments, the distance from the second connecting line CE to the first arc segment (i.e., arc CE) may be 3.0 mm or less to further prevent the earhook 13 from being too large and affecting the wearing effect of the earphone 10. In some embodiments, the distance from the second connecting line CE to the first arc segment (i.e., arc CE) may be 2.8 mm or less to further prevent the earhook 13 from being too large.

[0075] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in FIG. 6, the distance from the second connecting line CE to the first arc segment (ie, the arc CE) may be 3.2 mm or less.

[0076] In some embodiments, when a second auxiliary line L5 is drawn through the second characteristic point C toward the second projection 12′, a second angle between the second auxiliary line L5 and the first connecting line OC has a second predetermined value range, and an intersection H of the second auxiliary line L5 and a curve segment of the inner contour curve of the third projection 13′ connected to the second projection 12′ may be defined as a fifth characteristic point. A line CH connecting the fifth characteristic point H and the second characteristic point C is a fourth connecting line, and the fourth connecting line CH is collinear with the second auxiliary line L5. In some embodiments, the fifth characteristic point H may be defined as a boundary point between the inner contour curve of the third projection 13′ and the inner contour of the third projection 13′.

[0077] In some embodiments, if the second angle (i.e., ∠OCH) between the fourth connecting line CH and the first connecting line OC is too small, the contact portion 12 may press excessively against the back of the user's auricle. If the second angle between the fourth connecting line CH and the first connecting line OC is too large, the dimensions of the ear hook 13 may be too large, and the contact portion 12 may interfere with the head skin tissue behind the user's auricle.

[0078] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , the second angle between the fourth connecting line CH and the first connecting line OC may be 35° to 50° to prevent the contact unit 12 from excessively pressing against the ear and to avoid interference between the contact unit 12 and the skin of the user's head. In some embodiments, the second angle between the fourth connecting line CH and the first connecting line OC may be 36° to 43° to further prevent the contact unit 12 from excessively pressing against the ear. In some embodiments, the second angle between the fourth connecting line CH and the first connecting line OC may be 38° to 42° to further avoid interference between the contact unit 12 and the skin of the user's head. Exemplarily, the second angle between the fourth connecting line CH and the first connecting line OC may be 41°.

[0079] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the angle between the fourth connecting line CH and the first connecting line OC may be 34° to 49°. For example, the angle between the fourth connecting line CH and the first connecting line OC may be 40°.

[0080] In some embodiments, if the distance between the fifth feature point H and the second feature point C (i.e., the length of the fourth connecting line CH) is too large, the dimensions of the ear hook 13 will be too large, and the overall dimensions of the earphone 10 will be too large, which may affect the wearing effect and reduce portability. If the distance between the fifth feature point H and the second feature point C is too small, the ear hook 13 may interfere with the back of the auricle, which may cause a misalignment between the contact portion 12 located on the back of the auricle and the sound-generating unit 11 located in the cavity of the concha, which may affect the clamping strength between the contact portion 12 and the sound-generating unit 11 and the wearing stability of the earphone 10.

[0081] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , the length of the fourth connecting line CH may be 7 mm to 9 mm to avoid the ear hook 13 being too large and affecting the wearing effect, to avoid interference between the ear hook 13 and the rear of the auricle, to avoid misalignment between the contact unit 12 and the sound generating unit 11, and to improve the wearing stability of the earphone 10. In some embodiments, the length of the fourth connecting line CH may be 7.2 mm to 8.6 mm to further prevent the ear hook 13 from being too large. In some embodiments, the length of the fourth connecting line CH may be 7.4 mm to 8.2 mm to further improve the wearing stability and wearing comfort of the earphone 10. For example, the length of the fourth connecting line CH may be 7.6 mm.

[0082] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the length of the fourth connecting line CH may be 7.2 mm to 9.2 mm. For example, the length of the fourth connecting line CH may be 7.8 mm.

[0083] In some embodiments, the inner contour curve portion (i.e., the arc CH) of the third projection 13′ corresponding to the fourth connecting line CH has a third arc length, and the ratio of the third arc length to the length of the fourth connecting line CH may be defined as a third arc length / chord length ratio. The third arc length / chord length ratio may reflect the gentleness of the arc CH corresponding to the fourth connecting line CH. The larger the third arc length / chord length ratio, the greater the degree of protrusion of the arc CH corresponding to the fourth connecting line CH, and the larger the area within the arc CH, increasing the likelihood that the abutment portion 12 and the ear hook 13 will abut against the skin on the back of the auricle. The smaller the third arc length / chord length ratio, the gentler the arc CH corresponding to the fourth connecting line CH and the smaller the area within the arc CH, which may cause the corresponding portion of the ear hook 13 to interfere with the portion of the ear from the helix to the back of the auricle (e.g., the outermost point of the helix).

[0084] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , the third arc length / chord length ratio may be 1.10 to 1.23 to avoid interference between the ear hook 13 and the ear unit and to prevent the contact unit 12 and the ear hook 13 from pressing against the head skin behind the user's auricle. In some embodiments, the second arc length / chord length ratio may be 1.13 to 1.20 to further prevent interference between the ear hook 13 and the ear unit. In some embodiments, the third arc length / chord length ratio may be 1.15 to 1.19 to further prevent the contact unit 12 from pressing against the head skin behind the user's auricle. For example, the third arc length / chord length ratio may be 1.18.

[0085] Furthermore, by setting the range of the third arc length / chord length ratio, the degree of protrusion of the corresponding arc CH can be increased, thereby making it possible to distinguish it from the gentle arc CE segment. That is, the curve on the side of earhook 13 connected to sound generating unit 11 is gentle, while the curve on the side of earhook 13 connected to contact unit 12 is prominent, making it easier for the user to identify the wearing direction and avoiding incorrect wearing.

[0086] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the third arc length to chord length ratio may be 1.11 to 1.24. For example, the third arc length to chord length ratio may be 1.17.

[0087] As shown in FIG. 4 , in some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , an extension of the shortest connecting line O1 / O2 may be drawn, and the extension and the first projection 11′ may intersect at points O1 and G, with point G being the sixth feature point. In some embodiments, the distance between the first feature point O and the sixth feature point G (i.e., the length of the connecting line OG) may reflect the dimensions of the sound generating unit 11. If the distance between the first feature point O and the sixth feature point G is too large, the dimensions of the sound generating unit 11 are too large, which means that the sound generating unit 11 is likely to interfere with and press against the tragus. If the distance between the first feature point O and the sixth feature point G is too small, the dimensions of the sound generating unit 11 are too small, which means that the pressure in the cavity of the concha when worn is too high, reducing the sound generation efficiency of the sound generating unit 11.

[0088] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , the distance between the first feature point O and the sixth feature point G may be 12 mm to 15 mm to prevent the sound generating unit 11 from pressing against the tragus, to optimize the dimensions of the sound generating unit 11, and to improve sound generation efficiency. In some embodiments, the distance between the first feature point O and the sixth feature point G may be 12.5 mm to 14 mm to further prevent the sound generating unit 11 from pressing against the tragus. In some embodiments, the distance between the first feature point O and the sixth feature point G may be 13.5 mm to further optimize the dimensions of the sound generating unit 11.

[0089] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, a line parallel to the AB connecting line (i.e., the straight line L1) may be drawn through point O, and the parallel line may intersect with the first projection 11' at points O and G, thereby determining the position of the sixth feature point G. In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the distance between the first feature point O and the sixth feature point G may be 10.5 mm to 15.5 mm. For example, the distance between the first feature point O and the sixth feature point G may be 13.0 mm.

[0090] As shown in FIGS. 2, 3A, 3B, 4, and 6, in some embodiments, the housing of the sound-generating unit 11 may be provided with a decompression hole (not shown). The sound output hole 111 and the sound output hole are acoustically coupled to the acoustic cavities on either side of the diaphragm of the sound-generating assembly, respectively, to emit sound from the corresponding acoustic cavities. In some embodiments, the line connecting the centroid of the decompression hole and the centroid point J of the sound output hole 111 is oriented toward the opening of the user's ear canal, thereby improving the acoustic directionality of the sound-generating assembly. Preferably, the decompression hole may be located near the connection point between the housing of the sound-generating unit 11 and the earhook 13. Accordingly, the position of the projection of the decompression hole onto the first plane of symmetry S1 is located near the connection point between the inner contour of the first projection 11' and the inner contour region of the third projection 13'. That is, the position of the projection of the decompression hole onto the first plane of symmetry S1 is located in a region close to the fifth characteristic point E of the inner contour curve of the first projection 11' or the inner contour curve of the third projection 13'.

[0091] In the inner contour curve of the third projection 13' and the inner contour of the first projection 11', a second arc segment (e.g., arc EP1) and a third arc segment (e.g., arc EP2) are determined on both sides of the fourth characteristic point E, with the fourth characteristic point E as the center, and the arc lengths of the second arc segment (i.e., arc EP1) and the third arc segment (i.e., arc EP2) are both within a predetermined arc length range, and a line (i.e., connecting line P1P2) connecting one end of the second arc segment (i.e., arc EP1) remote from the fourth characteristic point E to one end of the third arc segment (i.e., arc EP2) remote from the fourth characteristic point E is defined as a third connecting line. In some embodiments, the projection of the decompression hole onto the first symmetry plane S1 may be located on the arc segment (i.e., arc P1P2) corresponding to the third connecting line P1P2. In some embodiments, the projection of the decompression hole onto the first plane of symmetry S1 may be located at a portion of the contour of the first projection 11' of the arc P1P2 (e.g., arc EP1 shown in FIGS. 4 and 6). In some embodiments, the outer contour of the projection of the decompression hole onto the first plane of symmetry S1 has two end points. Taking FIG. 6 as an example, points Q1 and Q2 shown in FIG. 6 are the two end points, and the opening between points Q1 and Q2 is the outer contour of the projection of the decompression hole. In some embodiments, to make the arc P1P2 continuous, points Q1 and Q2 may be connected, and the arc Q1Q2 may be represented by a connecting line Q1Q2.

[0092] The arc P1P2 has a second arc length, which is the sum of the arc length of the second arc segment (i.e., arc EP1) and the arc length of the third arc segment (i.e., arc EP2). To ensure sufficient installation space for the decompression holes, the second arc length of arc P1P2 should not be too small. To avoid misalignment of the decompression holes and affect the directivity of the sound generating unit 11, the second arc length of arc P1P2 should not be too large. In some embodiments, when the sound generating unit 11 and the abutment unit 12 have a non-contact structure as shown in FIG. 4 or a contact structure as shown in FIG. 6, the predetermined arc length range may be 2.5 mm to 3.5 mm. In some embodiments, to further provide an appropriate installation position for the decompression holes, the predetermined arc length range may be 2.7 mm to 3.2 mm.

[0093] In some embodiments, the ratio of the second arc length of the arc P1P2 corresponding to the third connecting line P1P2 to the length of the third connecting line P1P2 is defined as a second arc length-chord length ratio. The larger the second arc length-chord length ratio, the greater the curvature of the corresponding arc P1P2, and the greater the concavity of the inner contour near the connection position between the sound generating unit 11 and the ear hook 13 corresponding to the arc P1P2. The smaller the second arc length-chord length ratio, the gentler the corresponding arc P1P2, and the less the concavity of the inner contour near the connection position between the sound generating unit 11 and the ear hook 13 corresponding to the arc P1P2.

[0094] In some embodiments, the projection of the pressure reducing hole onto the first symmetry plane S1 is located at the arc P1P2. To prevent the pressure reducing hole from being covered by the auricle when worn, the curvature of the arc P1P2 is greater than a certain threshold, and the inner contour near the connection position between the sound generating unit 11 and the ear hook 13 corresponding to the arc P1P2 has a sufficient concave, so that the pressure reducing hole located at this concave position is not covered by the auricle.

[0095] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , the second arc length / chord length ratio is greater than 1.26 to prevent the decompression hole from being covered by the pinna. In some embodiments, the recess position needs to be kept from being too deep to prevent the connection between the sound generating unit 11 and the ear hook 13 from being too thin, which would affect the connection strength. Therefore, the second arc length / chord length ratio may be less than 1.44, i.e., the second arc length / chord length ratio may be 1.26 to 1.44. In some embodiments, the second arc length / chord length ratio may be 1.29 to 1.40 to further ensure that the recess position has sufficient depth to prevent the decompression hole from being covered by the pinna. In some embodiments, the second arc length / chord length ratio may be 1.33 to 1.38 to further prevent the connection between the sound generating unit 11 and the ear hook 13 from being too thin, which would affect the connection strength. For example, the second arc length / chord length ratio may be 1.35.

[0096] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the shape of the arc P1P2 may be the same as or approximately the same as the shape in the non-contact state shown in Fig. 4, and the second arc length / chord length ratio may be 1.26 to 1.44. For example, the second arc length / chord length ratio may be 1.35.

[0097] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4, the end point of the first projection 11' of the shortest connecting line O1O2 is point O1, and the end point of the arc P1P2 closest to the first projection 11' is point P1, and in the worn state, at least a part of the portion between points O1 and P1 of the inner contour of the first projection 11' (i.e., the arc O1P1) abuts and fits against the cavity of the concha, thereby isolating the sound emitting hole 111 and the decompression hole and preventing an acoustic short circuit (i.e., sounds from the sound emitting hole and the decompression hole interfering with each other in the auditory canal and canceling each other out) from occurring, which would affect the sound generation effect of the sound generating unit 11.

[0098] In some embodiments, when the sound generating unit 11 and the contact portion 12 have the contact structure shown in FIG. 6, in the worn state, at least a part of the portion between the first feature point O and point P1 (i.e., the arc OP1) contacts and fits against the cavity of the concha, thereby isolating the sound emission hole 111 and the pressure reduction hole, and preventing an acoustic short circuit from occurring and affecting the sound generation effect of the sound generating unit 11.

[0099] In some embodiments, the point N in the first projection 11′ that is closest to the second feature point C may be defined as the seventh feature point, and the line CN connecting the second feature point C and the seventh feature point N may be defined as the fifth connecting line. If the length of the fifth connecting line CN is too large, the sound generating unit 11 may interfere with the user's tragus, and if the length of the fifth connecting line CN is too small, the ear hook 13 may interfere with the front side of the pinna.

[0100] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4 to avoid interference between the earphone 10 and the user's ear, the length of the fifth connecting line CN may be 13 mm to 17 mm. In some embodiments, to further avoid interference between the sound generating unit 11 and the tragus, the length of the fifth connecting line CN may be 13.5 mm to 16 mm. In some embodiments, to further avoid interference between the sound generating unit 11 and the front side of the pinna, the length of the fifth connecting line CN may be 14 mm to 15.5 mm. For example, the length of the fifth connecting line CN may be 15 mm.

[0101] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the length of the fifth connecting line CN may be 12 mm to 16 mm. For example, the length of the fifth connecting line CN may be 14.5 mm.

[0102] If the angle between the fifth connecting line CN and the first connecting line OC (i.e., ∠NCO) is too large, the sound generating unit 11 may interfere with the tragus, and if the angle between the fifth connecting line CN and the first connecting line OC (i.e., ∠NCO) is too large, the ear hook 13 may interfere with the front of the auricle.

[0103] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , in order to avoid interference between the earphone 10 and the user's ear, the angle between the fifth connecting line CN and the first connecting line OC may be 13° to 27°. In some embodiments, in order to further avoid interference between the sound generating unit 11 and the tragus, the angle between the fifth connecting line CN and the first connecting line OC may be 14° to 25°. In some embodiments, in order to further avoid interference between the sound generating unit 11 and the front side of the pinna, the angle between the fifth connecting line CN and the first connecting line OC may be 18° to 23°. For example, the angle between the fifth connecting line CN and the first connecting line OC may be 21°.

[0104] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the angle between the fifth connecting line CN and the first connecting line OC may be 12° to 26°. For example, the angle between the fifth connecting line CN and the first connecting line OC may be 20°.

[0105] An extension of the fifth connecting line CN is drawn and intersects with the first projection 11′ at an eighth feature point M. In some embodiments, the eighth feature point M can be considered to be the point on the first projection 11′ that is farthest from the second feature point C. In some embodiments, the direction of the line connecting the second feature point C and the eighth feature point M is approximately toward the opening of the user's ear canal. In some embodiments, the sound emitting hole 111 is formed toward the opening of the user's ear canal, and the eighth feature point M may be located near a centroid point J of the sound emitting hole 111, or the eighth feature point M may overlap with the centroid point J of the sound emitting hole 111 (shown in FIG. 4 ).

[0106] The line connecting the seventh feature point N and the eighth feature point M is defined as the sixth connecting line (i.e., the connecting line NM). The curved line segment (i.e., the arc NM) of the first projection 11′ corresponding to the sixth connecting line NM has a fourth arc length, and the ratio of the fourth arc length (i.e., the arc NM) to the length of the sixth connecting line (i.e., the connecting line NM) is defined as the fourth arc length-chord length ratio. The fourth arc length-chord length ratio can reflect the shape of the first projection 11′ and thereby reflect the shape of the sound generating unit 11.

[0107] In some embodiments, when the sound-generating unit 11 and the contacting unit 12 have a non-contact structure as shown in FIG. 4 or a contact structure as shown in FIG. 6 , the fourth arc-to-chord ratio may be 1.4 to 1.7, thereby making the arc NM approximately semicircular and the sixth connecting line NM the diameter of the first projection 11′, thereby making the sound-generating unit 11 spherical or approximately spherical, allowing the shape of the sound-generating unit 11 to adapt to the cavity of the concha, and improving the wearing comfort of the earphone 10. If the distance between the second feature point C and the eighth feature point M is too large, the sound-generating unit 11 may block the opening of the user's ear canal or interfere with the tragus. If the distance between the second feature point C and the eighth feature point M is too small, it may affect the dimensions of the sound-generating unit 11, affecting the listening experience, or causing the sound-generating unit 11 to interfere with the antihelix.

[0108] In some embodiments, when the sound-generating unit 11 and the contact unit 12 have the non-contact structure shown in FIG. 4 , the distance between the second feature point C and the eighth feature point M may be 26.5 mm to 29.5 mm to prevent the sound-generating unit 11 from blocking the opening of the user's ear canal, to prevent interference between the sound-generating unit 11 and the tragus or antihelix, and to ensure the user's listening experience. In some embodiments, the distance between the second feature point C and the eighth feature point M may be 27 mm to 29 mm to further prevent the sound-generating unit 11 from interfering with the tragus or blocking the opening of the ear canal. In some embodiments, the distance between the second feature point C and the eighth feature point M may be 27.5 mm to 28 mm to further prevent interference between the sound-generating unit 11 and the antihelix and to ensure the dimensions of the sound-generating unit 11. Exemplarily, the distance between the second feature point C and the eighth feature point M may be 27.7 mm.

[0109] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the distance between the second characteristic point C and the eighth characteristic point M may be 27 mm to 30 mm. For example, the distance between the second characteristic point C and the eighth characteristic point M may be 27.8 mm.

[0110] In some embodiments, when a third auxiliary line L6 is drawn through the second characteristic point C toward the side biased toward the second projection 12′, the third auxiliary line L6 has at least one intersection with the contour of the second projection 12′, and the intersection point D, which is farthest from the second characteristic point C, is determined as the ninth characteristic point. A line CD connecting the ninth characteristic point D and the second characteristic point C is determined as the sixth connecting line. In some embodiments, point D is the point on the abutting portion 12 that is farthest from the second characteristic point C.

[0111] In some embodiments, the relative position of the ninth feature point D and the second feature point C affects the position or posture of the contact portion 12 when worn. If the distance between the ninth feature point D and the second feature point C (i.e., the length of the sixth connecting line CD) is too large, or if the third angle between the sixth connecting line CD and the first connecting line OC (i.e., ∠OCD) is too large, the contact portion 12 may interfere with the head skin tissue behind the user's auricle when worn. If the distance between the ninth feature point D and the second feature point C (i.e., the length of the sixth connecting line CD) is too small, or if the third angle between the sixth connecting line CD and the first connecting line OC (i.e., ∠OCD) is too small, the contact portion 12 may excessively press against the tissue behind the user's auricle.

[0112] 4, in order to prevent the contact portion 12 from excessively pressing against the ear portion and to prevent interference between the contact portion 12 and the skin of the user's head, the length of the sixth connecting line CD may be less than 22 mm, and the third angle between the sixth connecting line CD and the first connecting line OC may be 18° to 22°. In some embodiments, in order to further prevent the contact portion 12 from excessively pressing against the ear portion, the length of the sixth connecting line CD may be greater than 17 mm, i.e., the length of the sixth connecting line CD may be 17 mm to 22 mm, and the third angle between the sixth connecting line CD and the first connecting line OC may be 18.2° to 19.8°. In some embodiments, to further avoid interference between the contact portion 12 and the skin of the user's head, the length of the sixth connecting line CD may be 18.5 mm to 20 mm, and the third angle between the sixth connecting line CD and the first connecting line OC may be 18.5° to 19.2°. Exemplarily, the length of the sixth connecting line CD may be 19.8 mm, and the third angle between the sixth connecting line CD and the first connecting line OC may be 19°.

[0113] In some embodiments, when the sound generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, the length of the sixth connecting line CD may be 16mm to 21mm, and the third angle between the sixth connecting line CD and the first connecting line OC may be 18° to 20°. For example, the length of the sixth connecting line CD may be 20.6mm, and the third angle between the sixth connecting line CD and the first connecting line OC may be 21°.

[0114] The data relating to the earphones 10 in FIGS. 2 to 6 are all data when the earphones 10 are not worn in their natural state, and FIGS. 4 and 6 respectively show the earphones 10 in their natural state in two different configurations.

[0115] FIG. 7 is a schematic diagram of an internal structure of an exemplary earhook according to some embodiments of the present disclosure. As shown in FIG. 7 , in some embodiments, the earhook 13 includes a metal sheet 131 and a flexible layer (not shown) wrapped around the metal sheet 131. The metal sheet 131 is used to connect the sound-generating unit 11 and the contact unit 12, and the flexible layer is used to protect the metal sheet 131. In some embodiments, the flexible layer further includes a conductor 134 for connecting electrical signals between the sound-generating unit 11 and the contact unit 12. In some embodiments, the influence of the conductor 134 may not be considered when determining the first symmetry plane S1 of the earhook 13, in order to reduce the calculation difficulty and improve efficiency.

[0116] In some embodiments, the metal sheet 131 has high support strength, good fatigue resistance, and a long service life. When the earhook 13 is pulled, the metal sheet 131, which is the support structure of the earhook 13, is less likely to twist, making it easier to attach the sound generating unit 11 and the contact unit 12, reducing the possibility of the earhook 13 being damaged, and improving the service life of the earhook 13.

[0117] In some embodiments, metal sheet 131 may include a resilient metal, such as a piece of titanium, to facilitate adjustment of ear hook 13 .

[0118] In some embodiments, the metal sheet 131 is located at the center of the earhook 13, and the first plane of symmetry S1 may overlap with the plane of symmetry in the width direction of the metal sheet 131. In some embodiments, if the width dimension of the metal sheet 131 is too large, the dimensions of the earhook 13 may be too large, and the earhook 13 may interfere with the user's ear, which may affect the wearing effect of the earphone 10. If the width dimension of the metal sheet 131 is too small, the twist resistance of the metal sheet 131 may be poor, and during the pulling process of the earhook 13, the metal sheet 131 may be twisted, which may affect the shape of the earhook 13 and affect the wearing effect of the earphone 10.

[0119] In some embodiments, the width of metal sheet 131 may be 1.5 mm to 3 mm to avoid interference between ear hook 13 and the user's ear, maintain the shape during the process of pulling ear hook 13, and ensure the wearing effect of earphone 10. In some embodiments, the width of metal sheet 131 may be 1.7 mm to 2.7 mm to further avoid interference between ear hook 13 and the user's ear. In some embodiments, the width of metal sheet 131 may be 2 mm to 2.5 mm to further prevent metal sheet 131 from twisting during the process of pulling ear hook 13, improve the service life of metal sheet 131, and maintain the shape of ear hook 13.

[0120] In some embodiments, the thickness of metal sheet 131 may be 0.15 mm to 0.3 mm so that ear hook 13 has sufficient support strength. In some embodiments, the thickness of metal sheet 131 may be 0.2 mm to 0.25 mm so that metal sheet 131 can support ear hook 13.

[0121] The width dimension of the metal sheet 131 is the dimension of the metal sheet 131 in a direction perpendicular to the first plane of symmetry S1. The thickness dimension of the metal sheet 131 is the dimension of the metal sheet 131 in a direction perpendicular to the length direction within the first plane of symmetry S1.

[0122] In some embodiments, a flexible circuit board may be provided on the metal sheet 131 to facilitate wiring and circuit layout. In some embodiments, as shown in Figure 7, recesses 1311 are provided on both ends of the metal sheet 131 connected to the sound generating part 11 and the contact part 12. The provision of the recesses 1311 makes it easier for the ear hook 13 to seal in the adhesive during the molding process.

[0123] FIG. 8A is a schematic diagram of an example earphone according to some embodiments herein in a first stable position, FIG. 8B is a schematic diagram of an example earphone according to some embodiments herein in a second stable position, and FIG. 9 is a schematic diagram of an example bistable structure according to some embodiments herein. As shown in FIGS. 8A, 8B, and 9, in some embodiments, a bistable structure 133 is provided on a metal sheet 131, and the bistable structure 133 is used to configure the earhook 13 to have a first stable position (shown in FIG. 8A) and a second stable position (shown in FIG. 8B). Controlling the engagement of the earhook 13 between the first and second stable positions can facilitate putting on and taking off the earphone 10. In some embodiments, the bistable structure 133 is provided near the second feature point C. Since the gentleness of the inner contour curve of the third projection 13' on both sides of the second characteristic point C is different, by placing the bistable structure 133 near the second characteristic point C, a large difference can be created between the first stable position and the second stable position, making it easier to put on or take off the earphone 10.

[0124] In some embodiments, the first stable position allows the user to easily wear the earphone 10, and the second stable position allows the earphone 10 to be stably clamped around the user's ear. In some embodiments, the length of the shortest connecting line O1O2 corresponding to the first stable position is greater than the length of the shortest connecting line O1O2 corresponding to the second stable position, making it easier to wear, fasten, and remove the earphone 10. When the sound-generating unit 11 and the abutting unit 12 are in contact, the length of the corresponding shortest connecting line O1O2 can be considered to be zero. In some embodiments, the length of the shortest connecting line O1O2 corresponding to the first stable position may be greater than or equal to the thickness of the user's helix, so that the user's helix can be placed between the sound-generating unit 11 and the abutting unit 12 and the earphone 10 is in the clamping position. In some embodiments, the length of the shortest connecting line O1O2 corresponding to the second stable position may be less than the thickness of the user's helix, so that the sound-generating unit 11 and the abutting unit 12 can clamp the user's helix and stably wear the earphone 10. In some embodiments, when the earhook 13 is in the first stable position, the distance between the sound generating unit 11 and the contact portion 12 (e.g., the length of the shortest connecting line O1O2) is the longest, and when the earhook 13 is in the second stable position, the distance between the sound generating unit 11 and the contact portion 12 (e.g., the length of the shortest connecting line O1O2) is the shortest. In some embodiments, the distance between the sound generating unit 11 and the contact portion 12 (e.g., the length of the shortest connecting line O1O2) when the earphone 10 is in the worn state is greater than the distance between the sound generating unit 11 and the contact portion 12 (e.g., the length of the shortest connecting line O1O2) when the earhook 13 is in the second stable position.

[0125] In some embodiments, when the sound generating unit 11 and the contact unit 12 have a non-contact structure as shown in FIG. 4, when the ear hook 13 is in the first stable position, the earphone 10 may be in the position state shown in FIG. 4, and the length of the shortest connecting line O1O2 corresponding to the first stable position is greater than the length of the shortest connecting line O1O2 corresponding to the second stable position.

[0126] In some embodiments, if the sound-generating unit 11 and the contact unit 12 have the contact structure shown in Fig. 6, when the earhook 13 is in the second stable position, the earphone 10 may be in the position shown in Fig. 6. When the earhook 13 is in the first stable position, the first projection 11' and the second projection 12' are not in contact with each other, i.e., the sound-generating unit 11 and the contact unit 12 are not in contact with each other.

[0127] In some embodiments, when a user wants to wear the earphone 10, if the ear hook 13 is in the first stable position, the user can hold the earphone 10 with one hand and place it in the wearing position of the ear part 100, and then apply force to the earphone 10 with the other hand (for example, different fingers respectively abut against the outer contour of the sound generating part 11 and the outer contour of the abutting part 12, bringing the sound generating part 11 and the abutting part 12 closer to each other), changing the ear hook 13 from the first stable position to the second stable position, thereby realizing a clamped wearing of the earphone 10.

[0128] In some embodiments, when a user wants to wear the earphone 10, if the ear hook 13 is in the second stable position, the user can move the abutment portion 12 away from the sound generating portion 11 to change the ear hook 13 from the second stable position to the first stable position, making it easier to wear the earphone 10 thereafter.

[0129] In some embodiments, when a user wants to remove the earphone 10 worn on the ear, the user can pull the contact portion 12 away from the sound generating portion 11 to change the position of the ear hook 13 in the worn state to the first stable position, making it easier to remove the earphone 10.

[0130] 9 , in some embodiments, the bistable structure 133 may include a protrusion 1331 and an abutment portion 1332, and the abutment portion 1332 abuts against a protrusion point (not shown) of the protrusion portion 1331. When the abutment portion 1332 abuts against the protrusion point of the protrusion portion 1331, the pressure between the abutment portion 1332 and the protrusion portion 1331 becomes maximum, and the abutment portion 1332 and the protrusion portion 1331 become unstable. When the abutment portion 1332 abuts against both sides of the protrusion point of the protrusion portion 1331, the pressure between the abutment portion 1332 and the protrusion portion 1331 becomes small, and the abutment portion 1332 and the protrusion portion 1331 become stable. That is, when the abutment portion 1332 abuts against both sides of the protrusion point of the protrusion portion 1331, a first stable position and a second stable position are formed. In some embodiments, when the abutment portion 1332 abuts against the side of the protrusion point on the protrusion portion 1331 away from the abutment portion 12 (i.e., the side closer to the outer contour of the ear hook 13), the ear hook 13 is in a first stable position, and when the abutment portion 1332 abuts against the side of the protrusion point on the protrusion portion 1331 closer to the abutment portion 12 (i.e., the side closer to the inner contour of the ear hook 13), the ear hook 13 is in a second stable position.

[0131] In some embodiments, the earphone 10 can be switched between the first and second stable positions using a different design for the bistable structure 133. For example, the bistable structure can be a two-dimensional curved bistable structure, for example, by stacking two layers of sheets distorted at a 90° angle to form a bistable structure with different curvature patterns. Alternatively, the bistable structure 133 can be realized by designing a smart material (e.g., liquid crystal, hydrogel, or shape-memory polymer) as a beam structure. Changing the driving conditions of these smart materials (e.g., changing the magnetic or electric field applied to the material) can enable the earphone 10 to switch between the two stable positions. Specifically, a button for switching the stable positions can be installed on the earphone 10, and input from the button corresponds to changing the driving conditions.

[0132] Although the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure above is merely illustrative and does not limit the present application. Although not expressly described herein, those skilled in the art may make various changes, improvements, and modifications to the present application. These changes, improvements, and modifications are intended to be suggested by the present application and therefore fall within the spirit and scope of the exemplary embodiments of the present application.

[0133] Furthermore, certain terms are used herein to describe embodiments of the present application. For example, "one embodiment," "one embodiment," and / or "some embodiments" refer to particular features, structures, or characteristics associated with at least one embodiment of the present application. Therefore, it is emphasized and understood that references to "one embodiment" or "one embodiment" or "one alternative embodiment" in various parts of this specification do not necessarily all refer to the same embodiment. Furthermore, particular features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

[0134] Similarly, in the foregoing description of embodiments of the present application, various features may be grouped together in a single embodiment, drawing, or description for the purpose of simplifying the disclosure and facilitating an understanding of one or more embodiments of the present invention. However, this method of disclosure should not be interpreted as reflecting an intention that the present subject matter requires more features than are recited in each claim. In fact, an embodiment may include fewer than all features of a single embodiment disclosed above.

[0135] In some embodiments, numbers describing the number of components and attributes are used, and the numbers describing such embodiments should be understood to be modified in some instances by the modifiers "about," "approximately," or "substantially." Unless otherwise specified, "about," "approximately," or "substantially" indicates that a variation of ±20% from the value described by the number is permitted. Accordingly, in some embodiments, all numerical parameters used in the specification and claims are approximations that may vary depending on the characteristics required for a particular embodiment. In some embodiments, numerical parameters should be used with the stated number of significant digits and ordinary rounding techniques should be applied. While in some embodiments, the numerical ranges and parameters used to determine ranges are approximations, in specific embodiments, such numerical values ​​are set as precisely as possible.

[0136] All patents, patent applications, published patent applications, and other materials, such as papers, books, specifications, publications, and documents, referenced in this application are incorporated herein by reference in their entirety, except for prosecution history documents that are inconsistent with or inconsistent with the content of this application and documents that may have a limiting effect on the broadest scope of the claims of this application (now or later related to this application). Furthermore, if the explanations, definitions, and / or term usage in the accompanying materials of this application are inconsistent with or inconsistent with the content set forth in this application, the explanations, definitions, and / or term usage in this application shall control.

[0137] Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the present embodiments. Other variations may be within the scope of the present application. Thus, by way of example, and not of limitation, alternative configurations of the present embodiments may be considered consistent with the teachings of the present application. Accordingly, the present embodiments are not limited to the embodiments expressly introduced and described herein. [Explanation of symbols]

[0138] 10. Ear cuff type earphones 11. Sound generation section 12 When receiving part 13 ear hooks 100 Ears 101 External auditory canal opening 102. Conchae cavity 103 Ear-armored ark 104 Triangular fossa 105 Helix of the ear 106 Boat-shaped nest 107 Helix 111 Sound hole 131 Metal シート 133 Double-stable structure 134 wire 1311 concave part 1331 Protrusion 1332 Tudang Department

Claims

1. a housing having a receiving cavity disposed therein; a sound generating assembly housed within the housing cavity; a sound generating unit including a sound emission hole located in the housing and configured to emit sound generated by the sound generating assembly, the sound generating unit being configured to be located in the concha cavity of the user and to contact an inner wall of the concha cavity; a contact portion configured to contact the back of the user's ear; an ear hook configured to be connected to the sound generating unit and the contact unit while bypassing the antihelix and helix of the user, the ear hook has a first plane of symmetry, the housing forms a first projection when projected onto the first plane of symmetry, the abutment portion forms a second projection when projected onto the first plane of symmetry, and the ear hook forms a third projection when projected onto the first plane of symmetry, the third projection including an inner contour curve; a shortest connecting line is defined between the first projection and the second projection, a midpoint of the shortest connecting line is set to a first feature point, a point on the inner contour curve that is farthest from the first feature point is set to a second feature point, and a distance between the first feature point and the second feature point is 16 mm to 20 mm.

2. The earphone according to claim 1 , wherein the contact portion and the second feature point are located on the same side as the first feature point in the direction of the shortest connection line.

3. The earphone according to claim 2 , wherein the distance between the first feature point and the second feature point in the direction in which the shortest connecting line is defined is between 8.2 mm and 11 mm.

4. The earphone according to claim 2, wherein a line connecting the first feature point and the second feature point is defined as a first connecting line, and an angle between the first connecting line and the shortest connecting line is between 50° and 65°.

5. The earphone according to claim 2 , wherein the centroid of the second projection is defined as a third feature point, and the second feature point is farther from the first feature point than the third feature point in the direction of the shortest connecting line.

6. 6. The earphone according to claim 5, wherein a line connecting the first feature point and the second feature point is defined as a first connecting line, and an angle between the line connecting the first feature point and the third feature point and the first connecting line is between 42° and 62°.

7. 3. The earphone according to claim 2, wherein a line connecting the first feature point and the second feature point is defined as a first connecting line, and when a first auxiliary line is drawn through the second feature point on a side biased toward the first projection, a first angle between the first auxiliary line and the first connecting line has a first predetermined value range, an intersection of the first auxiliary line and a curve segment connected to the first projection of the inner contour curve is defined as a fourth feature point, and a line connecting the fourth feature point and the second feature point is defined as a second connecting line, and the first predetermined value range is 30° to 40°.

8. The earphone according to claim 7, wherein the second connecting line has a length of 16 mm to 22 mm.

9. 8. The earphone according to claim 7, wherein a portion of the inner contour curve corresponding to the second connecting line has a first arc length, a ratio between the first arc length and the length of the second connecting line is defined as a first arc length-chord length ratio, and the first arc length-chord length ratio is 1.05 to 1.

20.

10. 8. The earphone according to claim 7, wherein a portion of the inner contour curve corresponding to the second connecting line is defined as a first arc segment, and a distance from the second connecting line to the first arc segment is 3.4 mm or less.

11. 8. The earphone of claim 7, wherein a second arc segment and a third arc segment are determined on both sides of the fourth feature point with the fourth feature point as a center, the arc lengths of the second arc segment and the third arc segment are both within a predetermined arc length range, a line connecting one end of the second arc segment remote from the fourth feature point and one end of the third arc segment remote from the fourth feature point is defined as a third connecting line, the arc segment corresponding to the third connecting line has a second arc length, the predetermined arc length range is 2.5 mm to 3.5 mm, and a ratio of the second arc length to the length of the third connecting line is defined as a second arc length / chord length ratio, the second arc length / chord length ratio being 1.26 to 1.

44.

12. 2. The earphone according to claim 1, wherein when a second auxiliary line is drawn through the second feature point on a side biased toward the second projection, a second angle between the second auxiliary line and the first connecting line has a second predetermined value range, an intersection of the second auxiliary line and a curve segment connected to the second projection of the inner contour curve is defined as a fifth feature point, and a line connecting the fifth feature point and the second feature point is defined as a fourth connecting line, and the second predetermined value range is 35° to 50°.

13. The earphone according to claim 12, wherein the fourth connecting line has a length of 7 mm to 9 mm.

14. 13. The earphone according to claim 12, wherein a portion of the inner contour curve corresponding to the fourth connecting line has a third arc length, a ratio between the third arc length and the length of the fourth connecting line is defined as a third arc length-chord length ratio, and the third arc length-chord length ratio is 1.10 to 1.

23.

15. The earphone according to claim 1, wherein an intersection of an extension of the shortest connection line and the contour of the first projection is set to a sixth feature point, and the distance between the first feature point and the sixth feature point is 12 mm to 15 mm.

16. 2. The earphone according to claim 1, wherein a line connecting the first feature point and the second feature point is defined as a first connecting line, a point of the first projection closest to the second feature point is defined as a seventh feature point, a line connecting the second feature point and the seventh feature point is defined as a fifth connecting line, a length of the fifth connecting line is 13 mm to 17 mm, and an angle between the fifth connecting line and the first connecting line is 13° to 27°.

17. 17. The earphone of claim 16, wherein an extension of the fifth connecting line and the first projection intersect at an eighth feature point, a line connecting the seventh feature point and the eighth feature point is defined as a sixth connecting line, a curved line segment of the first projection corresponding to the sixth connecting line has a fourth arc length, a ratio of the fourth arc length to a length of the sixth connecting line is defined as a fourth arc length / chord length ratio, and the fourth arc length / chord length ratio is 1.4 to 1.

7.

18. The earphone according to claim 17, wherein the distance between the second feature point and the eighth feature point is 26.5 mm to 29.5 mm.

19. 2. The earphone of claim 1, wherein a line connecting the first feature point and the second feature point is defined as a first connecting line, and when a third extension line is drawn passing through the second feature point and biased toward the second projection, a third angle between the third extension line and the first connecting line has a third predetermined value range, the third extension line and the outline of the second projection have at least one intersection point, and the intersection point farthest from the second feature point is defined as a ninth feature point, and the line connecting the second feature point and the ninth feature point is defined as a sixth connecting line, the third predetermined value range is 18° to 22°, and the length of the sixth connecting line is 17 mm to 22 mm.

20. The earphone according to claim 1 , wherein, in a worn state, a point on the sound generating unit corresponding to an end point of the first projection of the shortest connection line is covered by the cavity of the concha.

21. 2. The earphone according to claim 1, wherein the earhook includes a metal sheet and a flexible layer wrapped around the outside of the metal sheet, both ends of the metal sheet in the longitudinal direction are connected to the housing and the abutting portion, respectively, and the metal sheet has a width dimension of 1.5 mm to 3 mm and a thickness of 0.15 mm to 0.3 mm.

22. 22. The earphone according to claim 21, wherein a bistable structure is provided on the metal sheet, the bistable structure is used to set the earhook to a first stable position and a second stable position, and a length of the shortest connecting line corresponding to the first stable position is greater than a length of the shortest connecting line corresponding to the second stable position.

23. 23. The earphone according to claim 22, wherein the bistable structure includes a protrusion and an abutment, the abutment abutting against a protrusion point of the protrusion, and the first stable position and the second stable position are formed when the abutment abuts against both sides of the protrusion point.

24. a housing having a receiving cavity disposed therein; a sound generating assembly housed within the housing cavity; a sound generating unit including a sound emission hole located in the housing and configured to emit sound generated by the sound generating assembly, the sound generating unit being configured to be located in the concha cavity of the user and to contact an inner wall of the concha cavity; a contact portion configured to contact the back of the user's ear; an ear hook configured to be connected to the sound generating unit and the contact unit while bypassing the antihelix and helix of the user, the ear hook has a first plane of symmetry, the housing forms a first projection when projected onto the first plane of symmetry, the abutment portion forms a second projection when projected onto the first plane of symmetry, and the ear hook forms a third projection when projected onto the first plane of symmetry, the third projection including an inner contour curve; the first projection and the second projection are in contact with each other, the first projection and the second projection have a first common tangent therebetween, the first common tangent is tangent to both the first projection and the second projection at a first tangent point, the first tangent point is defined as a first feature point, a point on the inner contour curve that is farthest from the first feature point is defined as a second feature point, and a distance between the first feature point and the second feature point is 16.5 mm to 20.5 mm.

25. 25. The earphone according to claim 24, wherein a side of the first projection away from the third projection and a side of the second projection away from the third projection have a second common tangent, the second common tangent being tangent to the first projection at a second tangent point and the second common tangent being tangent to the second projection at a third tangent point, a line connecting the second tangent point and the third tangent point being defined as a reference connection line, and in the direction of the reference connection line, the abutment portion and the second feature point are located on the same side of the first feature point.

26. The earphone according to claim 25, wherein the distance between the first feature point and the second feature point is between 7.5 mm and 10 mm in the direction in which the reference connection line is defined.

27. The earphone according to claim 25, wherein a line connecting the first feature point and the second feature point is defined as a first connection line, and an angle between the first connection line and the reference connection line is between 45° and 60°.

28. The earphone of claim 25, wherein a centroid of the second projection is defined as a third feature point, and the second feature point is farther from the first feature point than the third feature point in the direction of the reference connection line.

29. The earphone according to claim 28, wherein a line connecting the first feature point and the second feature point is defined as a first connecting line, and an angle between the line connecting the first feature point and the third feature point and the first connecting line is between 45° and 65°.

30. 26. The earphone of claim 25, wherein a line connecting the first feature point and the second feature point is defined as a first connecting line, and when a first auxiliary line is drawn through the second feature point on a side biased toward the first projection, a first angle between the first auxiliary line and the first connecting line has a first predetermined value range, an intersection of the first auxiliary line and a curve segment connected to the first projection of the inner contour curve is defined as a fourth feature point, and a line connecting the fourth feature point and the second feature point is defined as a second connecting line, and the first predetermined value range is 27° to 37°.

31. The earphone according to claim 30, wherein the length of the second connecting line is 15.5 mm to 21.5 mm.

32. 31. The earphone according to claim 30, wherein a portion of the inner contour curve corresponding to the second connecting line has a first arc length, a ratio between the first arc length and the length of the second connecting line is defined as a first arc length-chord length ratio, and the first arc length-chord length ratio is 1.10 to 1.

25.

33. 31. The earphone according to claim 30, wherein a portion of the inner contour curve corresponding to the second connecting line is defined as a first arc segment, and a distance from the second connecting line to the first arc segment is 3.2 mm or less.

34. 31. The earphone of claim 30, wherein a second arc segment and a third arc segment are determined on both sides of the fourth feature point with the fourth feature point as a center, the arc lengths of the second arc segment and the third arc segment being within a predetermined arc length range, a line connecting one end of the second arc segment remote from the fourth feature point and one end of the third arc segment remote from the fourth feature point is defined as a third connecting line, the arc segment corresponding to the third connecting line has a second arc length, the predetermined arc length range is 2.5 mm to 3.5 mm, a ratio of the second arc length to the length of the third connecting line is defined as a second arc length / chord length ratio, the second arc length / chord length ratio being 1.26 to 1.

44.

35. 25. The earphone of claim 24, wherein when a second auxiliary line is drawn through the second feature point on a side biased toward the second projection, a second angle between the second auxiliary line and the first connecting line has a second predetermined value range, an intersection of the second auxiliary line and a curve segment connected to the second projection of the inner contour curve is defined as a fifth feature point, and a line connecting the fifth feature point and the second feature point is defined as a fourth connecting line, and the second predetermined value range is 34° to 49°.

36. The earphone according to claim 35, wherein the length of the fourth connecting line is 7.2 mm to 9.2 mm.

37. The earphone according to claim 35, wherein a portion of the inner contour curve corresponding to the fourth connecting line has a third arc length, a ratio of the third arc length to the length of the third connecting line is defined as a third arc length-chord length ratio, and the third arc length-chord length ratio is 1.11 to 1.

24.

38. The earphone according to claim 24, wherein when a parallel line of the reference connection line is drawn through the first feature point, the intersection of the parallel line and the contour of the first projection is set to be a sixth feature point, and the distance between the first feature point and the sixth feature point is 10.5 mm to 15.5 mm.

39. The earphone of claim 24, wherein a line connecting the first feature point and the second feature point is defined as a first connecting line, a point of the first projection closest to the second feature point is defined as a seventh feature point, a line connecting the seventh feature point and the second feature point is defined as a fifth connecting line, a length of the fifth connecting line is 12 mm to 16 mm, and an angle between the fifth connecting line and the first connecting line is 12° to 26°.

40. 40. The earphone of claim 39, wherein an extension of the fifth connecting line and the first projection intersect at an eighth feature point, a line connecting the seventh feature point and the eighth feature point is defined as a sixth connecting line, a curved line segment of the first projection corresponding to the sixth connecting line has a fourth arc length, a ratio of the fourth arc length to a length of the sixth connecting line is defined as a fourth arc length / chord length ratio, and the fourth arc length / chord length ratio is 1.4 to 1.

7.

41. The earphone according to claim 40, wherein the distance between the second feature point and the eighth feature point is between 27 mm and 30 mm.

42. 25. The earphone of claim 24, wherein a line connecting the first feature point and the second feature point is defined as a first connecting line, and when a third extension line is drawn passing through the second feature point and biased toward the second projection, a third angle between the third extension line and the first connecting line has a third predetermined value range, the third extension line and the outline of the second projection have at least one intersection point, and the intersection point farthest from the second feature point is defined as a ninth feature point, and the line connecting the second feature point and the ninth feature point is defined as a sixth connecting line, the third predetermined value range is 18° to 20°, and the length of the sixth connecting line is 16 mm to 21 mm.

43. The earphone according to claim 24 , wherein, in a worn state, a point on the sound generating unit corresponding to the first feature point is covered by the cavity of the concha.

44. The earphone according to claim 24, wherein the earhook includes a metal sheet and a flexible layer wrapped around the outside of the metal sheet, both ends of the metal sheet in the longitudinal direction are connected to the housing and the abutting portion, respectively, and the metal sheet has a width dimension of 1 mm to 3 mm and a thickness of 0.15 mm to 0.3 mm.

45. 45. The earphone of claim 44, wherein a bistable structure is provided on the metal sheet, the bistable structure is used to set the earhook to a first stable position and a second stable position, and when the earhook is in the first stable position, the first projection and the second projection do not come into contact, and when the earhook is in the second stable position, the first projection and the second projection come into contact.

46. 46. ​​The earphone of claim 45, wherein the bistable structure includes a protrusion and an abutment, the abutment abutting against a protrusion point of the protrusion, and the first stable position and the second stable position are formed when the abutment abuts against both sides of the protrusion point.

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