Earphone

Abstract

The invention provides an earphone. The earphone comprises a sound production part and an ear hook, the sound production part comprises a transducer and a shell for accommodating the transducer; the ear hook comprises a first part and a second part which are connected in sequence, in a wearing state, the first part is hung between the auricle and the head of a user, the second part extends towards the side, away from the head, of the auricle and is connected with the sound production part, and the sound production part is worn at the position near the ear canal but not blocking the ear canal opening; wherein the inner contour of the projection of the ear hook on the sagittal plane of the user comprises a first curve, the first curve has an extreme point in a first direction, and the first direction is perpendicular to the long axis direction of the projection of the sounding part; the extreme point is located on the rear side of a projection point of the upper vertex of the ear hook on the sagittal plane of the user, and the upper vertex of the ear hook is the highest point of the inner contour of the ear hook along the vertical axis of the user in a wearing state; the shell and the first part of the ear hook clamp the auricle of a user and provide a clamping force of 0.03 N-1 N to the auricle of the user.

Description

A headset

[0001] Cross-references

[0002] This application claims priority to Chinese application No. 202211336918.4 filed on October 28, 2022, priority to PCT application No. 202223239628.6 filed on December 1, 2022, priority to PCT application No. PCT / CN2022 / 144339 filed on December 30, 2022, and priority to PCT application No. PCT / CN2023 / 079400 filed on March 2, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of acoustic technology, and in particular to a headset. Background Art

[0004] With the development of acoustic output technology, acoustic devices (such as headphones) have become widely used in people's daily lives. They can be used in conjunction with electronic devices such as mobile phones and computers to provide users with an auditory feast. Based on the user's wearing method, acoustic devices can generally be divided into head-mounted, ear-hook, and in-ear types.

[0005] Therefore, it is necessary to provide an earphone that can improve the wearing comfort of the user and has better output performance.

[0006] Summary of the Invention

[0007] One of the embodiments of the present specification provides an earphone, comprising: a sound-emitting part, comprising a transducer and a shell accommodating the transducer; an ear hook, comprising a first part and a second part connected in sequence, wherein in a worn state, the first part is hung between the user's auricle and the head, and the second part extends to the side of the auricle away from the head and is connected to the sound-emitting part, so that the sound-emitting part is worn in a position near the ear canal but does not block the ear canal opening; wherein, the inner contour of the projection of the ear hook on the user's sagittal plane comprises a first curve, the first curve has an extreme point in a first direction, and the first direction is perpendicular to the long axis direction of the projection of the sound-emitting part; the extreme point is located on the rear side of the projection point of the upper vertex of the ear hook on the user's sagittal plane, and the upper vertex of the ear hook is the highest point of the inner contour of the ear hook along the vertical axis of the user in the worn state; the shell and the first part of the ear hook clamp the user's auricle and provide a clamping force of 0.03N-1N to the user's auricle. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0009] FIG1 is a schematic diagram of an exemplary ear according to some embodiments of the present application;

[0010] FIG2 is an exemplary structural diagram of an earphone according to some embodiments of this specification;

[0011] FIG3 is a schematic diagram of an exemplary wearing method of an earphone according to some embodiments of this specification;

[0012] FIG4 is a schematic diagram of an exemplary distribution of a cavity structure disposed around one of the dual sound sources according to some embodiments of this specification;

[0013] FIG5 is a schematic diagram of an exemplary projection of the earphone shown in FIG3 on the sagittal plane of a user;

[0014] FIG6 is an exemplary schematic diagram of a first curve of a projection of the earphone shown in FIG3 on a sagittal plane of a user;

[0015] FIG7 is a schematic diagram of an exemplary fitting function curve of a first curve according to some embodiments of this specification;

[0016] FIG8 is a schematic diagram of an exemplary first-order derivative curve of a fitting curve according to some embodiments of the present specification;

[0017] FIG9 is a schematic diagram of an exemplary second-order derivative curve of a fitting curve according to some embodiments of the present specification;

[0018] FIG10 is another exemplary structural diagram of the earphone shown in FIG3 ;

[0019] FIG11 is an exemplary schematic diagram of the projection point of the clamping area center of the earphone shown in FIG3 on the sagittal plane of the user and the projection point of the ear hook clamping point on the sagittal plane of the user;

[0020] 12A and 12B are schematic diagrams showing exemplary locations of the center of mass of an earphone according to some embodiments of this specification;

[0021] FIG13 is a schematic diagram showing an exemplary position of the center of mass of a sound-producing part according to some embodiments of the present specification;

[0022] FIG14 is a schematic diagram showing exemplary positions of the inner side of the sound-emitting part and the ear hook plane according to some embodiments of this specification;

[0023] FIG15 is a schematic diagram illustrating exemplary locations of points on an ear hook that are vertically farthest from the inner side of the sound-emitting portion according to some embodiments of this specification;

[0024] FIG16 is an exemplary schematic diagram of a cross section with the smallest area on an ear hook according to some embodiments of the present specification;

[0025] FIG17 is a schematic diagram of an exemplary fitting function curve of a second curve according to some embodiments of this specification;

[0026] FIG18 is a schematic diagram of an exemplary first-order derivative curve of a fitting curve according to some embodiments of the present specification;

[0027] FIG19 is a schematic diagram of an exemplary second-order derivative curve of a fitting curve according to some embodiments of the present specification.

[0028] FIG20 is an exemplary exploded view of the sound-emitting portion of the earphone shown in FIG3 ;

[0029] FIG21 is another exemplary wearing diagram of an earphone according to some embodiments of this specification;

[0030] FIG22 is a schematic diagram of an exemplary distribution of a baffle structure disposed between two sound sources of a dual sound source according to some embodiments of this specification;

[0031] FIG23 is a perspective view of a portion of an exemplary acoustic device according to some embodiments of the present application;

[0032] FIG. 24 is a cross-sectional view of an exemplary metal wire according to some embodiments of the present application. DETAILED DESCRIPTION

[0033] To more clearly illustrate the technical solutions of the embodiments of this specification, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this specification. Those skilled in the art can apply this specification to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0034] It should be understood that the terms "system," "device," "unit," and / or "module" used herein are a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0035] As used in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not refer to the singular but also include the plural. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0036] FIG1 is a schematic diagram of an exemplary ear according to some embodiments of the present application.

[0037] As shown in FIG1 , FIG1 is a schematic diagram of an exemplary ear according to some embodiments of the present application. Referring to FIG1 , the ear 100 may include an external auditory canal 101, a cavity concha 102, a cymba concha 103, a triangular fossa 104, an antihelix 105, a scaphoid 106, a helix 107, an earlobe 108, a crus helix 109, an outer contour 1013, and an inner contour 1014. It should be noted that, for ease of description, in the embodiments of this specification, the crus 1011, the crus 1012, and the antihelix 105 are collectively referred to as the antihelix region. In some embodiments, one or more parts of the ear 100 can be used to support the acoustic device to achieve stable wearing of the acoustic device. In some embodiments, the external auditory canal 101, the cavity concha 102, the cymba concha 103, the triangular fossa 104, and other parts have a certain depth and volume in three-dimensional space, which can be used to meet the wearing requirements of the acoustic device. For example, an acoustic device (e.g., an in-ear headphone) can be worn in the external auditory canal 101. In some embodiments, the acoustic device can be worn by utilizing other parts of the ear 100 other than the external auditory canal 101. For example, the acoustic device can be worn by utilizing the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, or the helix 107, or a combination thereof. In some embodiments, to improve the comfort and reliability of the acoustic device when worn, the acoustic device can further utilize parts such as the user's earlobe 108. By utilizing other parts of the ear 100 other than the external auditory canal 101 to achieve wearing the acoustic device and sound transmission, the user's external auditory canal 101 can be "liberated." When a user wears the acoustic device (headphone), the acoustic device does not block the user's external auditory canal 101. The user can receive both sound from the acoustic device and sounds from the environment (e.g., horns, car bells, surrounding human voices, traffic signals, etc.), thereby reducing the probability of traffic accidents. In some embodiments, the acoustic device can be designed to be compatible with the ear 100 based on the structure of the ear 100, so that the sound-producing portion of the acoustic device can be worn at different locations on the ear 100. For example, when the acoustic device is an earphone, the earphone can include a suspension structure (e.g., an ear hook) and a sound-producing portion. The sound-producing portion and the suspension structure are physically connected, and the suspension structure can be compatible with the shape of the auricle to place the entirety or a portion of the sound-producing portion in front of the crus helix 109 (e.g., area J surrounded by dotted lines in FIG1 ). For another example, when the user wears the earphone, the entirety or a portion of the sound-producing portion can contact the upper portion of the external auditory canal 101 (e.g., the location of one or more of the crus helix 109, cymba concha 103, triangular fossa 104, antihelix 105, scaphoid 106, and helix 107).For another example, when a user wears headphones, the entire or partial structure of the sound-producing part may be located in a cavity formed by one or more parts of the ear 100 (for example, the cavum concha 102, the bacula concha 103, the fossa triangularis 104, etc.) (for example, the area M1 surrounded by dotted lines in FIG1 , which includes at least the bacula concha 103 and the fossa triangularis 104, and the area M2 which includes at least the cavum concha 102).

[0038] Different users may have individual differences, resulting in different shapes, sizes and other dimensional differences in the ear 100. For the sake of ease of description and understanding, unless otherwise specified, this specification will mainly use an ear model with a "standard" shape and size as a reference to further describe how the acoustic device in different embodiments is worn on the ear model. For example, a simulator containing a head and its (left and right) ears 100, such as GRAS 45BC KEMAR, made based on ANSI: S3.36, S3.25 and IEC: 60318-7 standards, can be used as a reference for wearing the acoustic device, thereby presenting a scenario in which most users normally wear the acoustic device. Just as an example, the ear 100 used as a reference can have the following relevant characteristics: the size of the projection of the auricle on the sagittal plane in the vertical axis direction can be in the range of 49.5-74.3 mm, and the size of the projection of the auricle on the sagittal plane in the sagittal axis direction can be in the range of 36.6-55 mm. Therefore, in this application, descriptions such as "worn by the user", "in a wearing state" and "in a wearing state" may refer to the acoustic device described in this application being worn on the ear 100 of the aforementioned simulator. Of course, taking into account the individual differences between different users, the structure, shape, size, thickness, etc. of one or more parts of the ear 100 may be differentially designed according to the ears 100 of different shapes and sizes. These differentiated designs may be manifested in that the characteristic parameters of one or more parts of the acoustic device (for example, the sound-emitting part, ear hook, etc. hereinafter) may have different ranges of values ​​to adapt to different ears 100. In addition, it should be noted that the "non-wearing state" is not limited to the state where the earphone is not worn on the user's ear 100, but also includes the state where the earphone is not deformed by external force; the "wearing state" is not limited to the state where the earphone is worn on the user's ear 100, and the suspension structure (for example, ear hook) and the sound-emitting part are spread out to a corresponding distance can also be regarded as a wearing state.

[0039] It should be noted that in fields such as medicine and anatomy, the human body can be defined as three basic planes: the sagittal plane, the coronal plane, and the horizontal plane, as well as three basic axes: the sagittal axis, the coronal axis, and the vertical axis. The sagittal plane refers to a plane perpendicular to the ground, drawn along the front-to-back direction of the body, dividing the body into left and right parts; the coronal plane refers to a plane perpendicular to the ground, drawn along the left-to-right direction of the body, dividing the body into front and back parts; and the horizontal plane refers to a plane perpendicular to the ground, drawn along the top-to-bottom direction of the body, dividing the body into top and bottom parts. Accordingly, the sagittal axis refers to the axis along the front-to-back direction of the body and perpendicular to the coronal plane; the coronal axis refers to the axis along the left-to-right direction of the body and perpendicular to the sagittal plane; and the vertical axis refers to the axis along the top-to-bottom direction of the body and perpendicular to the horizontal plane. Furthermore, the "front side of the ear" as used herein is a concept relative to the "back side of the ear." The front side of the ear refers to the side of the ear 100 that faces the human face, along the sagittal axis, while the back side of the ear refers to the side of the ear 100 that faces away from the human face, along the sagittal axis. Observing the ear 100 of the simulator along the coronal axis of the human body yields the front profile diagram of the ear 100 shown in FIG1 .

[0040] The description of the ear portion 100 is for illustrative purposes only and is not intended to limit the scope of this application. A person skilled in the art can make various changes and modifications based on the description of this application. For example, a portion of the structure of the acoustic device can shield part or all of the external auditory canal 101. Such changes and modifications are still within the scope of protection of this application.

[0041] Figure 2 is an exemplary structural diagram of an earphone according to some embodiments of this specification. As shown in Figure 2, the earphone 10 may include a sound-emitting portion 11 and a suspension structure 12. In some embodiments, the earphone 10 can wear the sound-emitting portion 11 on the user's body (for example, the head, neck or upper torso of the human body) through the suspension structure 12. In some embodiments, the suspension structure 12 can be an ear hook 12, and the sound-emitting portion 11 is connected to one end of the ear hook 12, and the ear hook 12 can be set to a shape that is compatible with the user's ear 100. For example, the ear hook 12 can be an arc-shaped structure. In some embodiments, the suspension structure 12 can also be a clamping structure that is compatible with the user's auricle, so that the suspension structure 12 can be clamped at the user's auricle. In some embodiments, the ear hook 12 may include a first ear hook portion and a second ear hook portion. The first ear hook portion may be hung between the user's auricle and the user's head. The second ear hook portion may extend toward the side of the user's auricle away from the user's head and connect to the sound-emitting portion 11. The sound-emitting portion 11 is worn near the user's ear canal but does not block the user's ear canal opening, so that the user's ear 100 remains open, and the user can hear the sound output by the earphone 10 while obtaining the sound of the external environment. For example, the earphone 10 may be arranged around or partially around the user's outer ear 100, and sound may be transmitted by air conduction or bone conduction. In some embodiments, the ear hook 12 may be composed of a metal wire and a wrapping layer, so that the earphone 10 can be better worn on the user, ensuring comfort while preventing the user from falling off during use.

[0042] In some embodiments, the sound-emitting portion 11 may include a transducer and a housing that houses the transducer. The transducer can convert electrical signals into corresponding mechanical vibrations to produce sound. In some embodiments, the housing can be worn on the user's body and can carry the transducer. In some embodiments, the housing can be a closed, hollow structure with the transducer located within the housing. In some embodiments, the earphones 10 can be integrated with products such as eyeglasses, headphones, head-mounted displays, and AR / VR helmets. In these cases, the sound-emitting portion 11 can be worn near the user's ear 100 by hanging or clamping. In some embodiments, the housing can be provided with a hanging structure (e.g., a hook). For example, the shape of the hook can match the shape of the auricle, allowing the earphones 10 to be independently worn on the user's ear 100 using the hook. In some embodiments, the sound-emitting portion 11 can be a housing structure with a shape that matches the shape of the human ear 100, such as a circular ring, an elliptical ring, a polygon (regular or irregular), a U-shape, a V-shape, or a semicircular ring, so that the sound-emitting portion 11 can be directly attached to the user's ear 100. In some embodiments, the housing can also include a fixing structure. The fixing structure may include an ear hook, an elastic band, etc., so that the earphone 10 can be better worn on the user and prevent the user from falling off during use.

[0043] In conjunction with Figures 1 and 2, in some embodiments, when a user wears the earphones 10, at least a portion of the sound-emitting portion 11 can be located above, below, in front of the user's ear 100 (for example, area J in front of the tragus shown in Figure 1), or inside the auricle (for example, area M2 shown in Figure 1). The following will provide an exemplary description of different wearing positions (11A, 11B, and 11C) of the sound-emitting portion 11. In some embodiments, the sound-emitting portion 11A is located on the side of the user's ear 100 facing the human face along the sagittal axis, that is, the sound-emitting portion 11A is located on the face of the ear 100 facing the human body (for example, area J shown in Figure 1). Furthermore, a speaker is provided inside the housing of the sound-emitting portion 11A. The housing of the sound-emitting portion 11A can be provided with at least one sound outlet (not shown in Figure 2). The sound outlet can be located on the side wall of the housing facing or near the user's external auditory canal 101, and the speaker can output sound to the user's ear canal through the sound outlet.

[0044] In some embodiments, the speaker may include a diaphragm, and the chamber inside the housing is divided by the diaphragm into at least a front chamber and a rear chamber. The sound outlet is acoustically coupled to the front chamber, and the vibration of the diaphragm drives the air in the front chamber to vibrate to produce air-conducted sound. The air-conducted sound produced in the front chamber is transmitted to the outside through the sound outlet. In some embodiments, the housing may also include one or more pressure relief holes. The pressure relief holes may be located on a side wall of the housing adjacent to or opposite to the side wall where the sound outlet is located. The pressure relief holes are acoustically coupled to the rear chamber. The vibration of the diaphragm also drives the air in the rear chamber to vibrate to produce air-conducted sound. The air-conducted sound produced in the rear chamber can be transmitted to the outside through the pressure relief holes. Exemplarily, in some embodiments, the speaker in the sound-emitting part 11A can output sounds with a phase difference (for example, opposite phases) through the sound outlet and the pressure relief hole. The sound outlet can be located on the side wall of the shell of the sound-emitting part 11A facing the external auditory canal 101 of the user, and the pressure relief hole can be located on the side of the shell of the sound-emitting part 11 away from the external auditory canal 101 of the user. At this time, the shell can act as a baffle to increase the sound path difference between the sound outlet and the pressure relief hole to the external auditory canal 101, so as to increase the sound intensity at the external auditory canal 101 while reducing the volume of far-field sound leakage.

[0045] In some embodiments, the sound-emitting portion 11 may have a long axis direction Y and a short axis direction Z that are perpendicular to the thickness direction X and orthogonal to each other. The long axis direction Y may be defined as the direction with the maximum extension dimension in the shape of the two-dimensional projection surface of the sound-emitting portion 11 (for example, the projection of the sound-emitting portion 11 on the plane where its outer surface OS is located, or the projection on the sagittal plane) (for example, when the projection shape is a rectangle or an approximate rectangle, the long axis direction is the length direction of the rectangle or the approximate rectangle), and the short axis direction Z may be defined as the direction perpendicular to the long axis direction Y in the shape of the projection of the sound-emitting portion 11 on the sagittal plane (for example, when the projection shape is a rectangle or an approximate rectangle, the short axis direction is the width direction of the rectangle or the approximate rectangle). The thickness direction X may be defined as a direction perpendicular to the two-dimensional projection surface, for example, consistent with the direction of the coronal axis, both pointing to the left and right directions of the body; as shown in FIG10 , the thickness direction X may also be defined as the direction in which the shell approaches or moves away from the ear 100 when worn. In some embodiments, when the sound-emitting portion 11 is tilted when worn, the major axis Y and minor axis Z remain parallel or approximately parallel to the sagittal plane. The major axis Y can be angled with the sagittal axis, meaning that the major axis Y is also tilted accordingly. The minor axis Z can be angled with the vertical axis, meaning that the minor axis Z is also tilted, as shown in FIG2 , showing the wearing condition of the sound-emitting portion 11B. In some embodiments, the entirety or a portion of the housing of the sound-emitting portion 11B can extend into the cavum concha 102. In other words, the projection of the housing of the sound-emitting portion 11B on the sagittal plane overlaps with the projection of the cavum concha 102 on the sagittal plane. For more information about the sound-emitting portion 11B, please refer to other sections of this specification, such as FIG3 and its corresponding specification. In some embodiments, the sound-emitting portion 11 may be in a horizontal or approximately horizontal state when worn. As shown in the sound-emitting portion 11C of FIG2 , the long axis direction Y may be consistent or approximately consistent with the direction of the sagittal axis, both pointing to the front-to-back direction of the body, and the short axis direction Z may be consistent or approximately consistent with the direction of the vertical axis, both pointing to the top-to-bottom direction of the body. It should be noted that when worn, the sound-emitting portion 11C being in an approximately horizontal state may mean that the angle between the long axis direction of the sound-emitting portion 11C shown in FIG2 and the sagittal axis is within a specific range (e.g., not greater than 20°). For the specific details of the sound-emitting portion 11C, reference may be made to the contents elsewhere in this specification, such as FIG21 and its corresponding specification contents. In addition, the wearing position of the sound-emitting portion 11 is not limited to the sound-emitting portion 11A, the sound-emitting portion 11B, and the sound-emitting portion 11C shown in FIG2 , and only needs to meet the requirements of the area J, area M1, or area M2 shown in FIG1 . For example, the entirety or a portion of the structure of the sound-emitting portion 11 may be located in front of the crus helix 109 (e.g., the area J enclosed by the dotted line in FIG1 ).For another example, the entirety or a portion of the sound-producing portion 11 may contact the upper portion of the external auditory canal 101 (e.g., the location of one or more of the crus helix 109, cymba concha 103, triangular fossa 104, antihelix 105, scaphoid 106, and helix 107). For another example, the entirety or a portion of the sound-producing portion 11 of the acoustic device may be located within a cavity formed by one or more of the ear 100 (e.g., the cavum concha 102, cymba concha 103, and triangular fossa 104) (e.g., the region M1 enclosed by the dotted line in FIG. 1 , which includes at least the cymba concha 103 and triangular fossa 104, and the region M2 including at least the cavum concha 102).

[0046] In some embodiments, to improve the stability of the earphone 10 when worn, the earphone 10 may employ any one or a combination of the following methods. First, at least a portion of the earhook 12 is configured as a contoured structure that conforms to at least one of the back of the ear or the head, thereby increasing the contact area between the earhook 12 and the ear 100 and / or the head, thereby increasing the resistance to the earphone 10 falling off the ear 100. Second, at least a portion of the earhook 12 is configured as an elastic structure that deforms when worn, thereby increasing the positive pressure exerted by the earhook 12 on the ear 100 and / or the head, thereby increasing the resistance to the earphone 10 falling off the ear 100. Third, at least a portion of the earhook 12 is configured to rest against the head when worn, generating a reaction force that presses against the ear 100, causing the sound-emitting portion 11 to press against the front of the ear, thereby increasing the resistance to the earphone 10 falling off the ear 100. Fourth, the sound-producing portion 11 and ear hook 12 are configured to clamp the antihelix region and the area where the cavum concha 102 is located from the front and back sides of the ear 100 when worn, thereby increasing resistance to the earphone 10 falling off the ear 100. Fifth, the sound-producing portion 11 or an auxiliary structure connected thereto is configured to at least partially extend into cavities such as the cavum concha 102, the cymba concha 103, the triangular fossa 104, and the scaphoid 106, thereby increasing resistance to the earphone 10 falling off the ear 100.

[0047] As an example, referring to Figure 3 , when worn, the free end FE of the sound-emitting portion 11 can extend into the cavum concha 102. The sound-emitting portion 11 and the ear hook 12 can be configured to clamp the cavum concha 102 from both the front and rear sides of the ear region, thereby increasing resistance to the earphone 10 falling off the ear 100 and improving the stability of the earphone 10 when worn. For example, the free end FE can be pressed against the cavum concha 102 in the thickness direction X. For another example, the free end FE can abut against the cavum concha 102 in both the major axis direction Y and the minor axis direction Z.

[0048] The earphone 10 shown in FIG3 is taken as an example to explain the earphone 10 in detail. It should be noted that the structure and corresponding parameters of the earphone 10 in FIG3 can also be applied to earphones of other configurations mentioned above without violating the corresponding acoustic principles.

[0049] By extending the sound-emitting portion 11 at least partially into the cavum concha 102, the listening volume at the listening position (e.g., at the opening of the ear canal), especially the listening volume of mid- and low-frequency sounds, can be increased, while still maintaining a good far-field sound leakage cancellation effect. For illustrative purposes only, when the entire or partial structure of the sound-emitting portion 11 extends into the cavum concha 102, the sound-emitting portion 11 and the cavum concha 102 form a structure similar to a cavity (hereinafter referred to as a quasi-cavity). In the embodiments of the specification, the quasi-cavity can be understood as a semi-enclosed structure enclosed by the side walls of the sound-emitting portion 11 and the cavum concha 102 structure. This semi-enclosed structure is not completely sealed and isolated from the external environment, but has a leakage structure (e.g., an opening, a gap, a pipe, etc.) that is acoustically connected to the external environment. When the user wears the earphone 10, one or more sound outlet holes may be provided on the side of the housing of the sound-emitting portion 11 close to or facing the user's ear canal, and one or more pressure relief holes may be provided on the other sidewalls of the housing of the sound-emitting portion 11 (e.g., the sidewall away from or facing away from the user's ear canal). The sound outlet holes are acoustically coupled to the front cavity of the earphone 10, and the pressure relief holes are acoustically coupled to the rear cavity of the earphone 10. Taking the example of the sound-emitting portion 11 including a sound outlet hole and a pressure relief hole, the sound output by the sound outlet hole and the sound output by the pressure relief hole can be approximately regarded as two sound sources, the sound waves of the two sound sources having opposite phases. The inner walls of the sound-emitting portion 11 and the corresponding cavum conchae 102 form a cavity-like structure, wherein the sound source corresponding to the sound outlet hole is located within the cavity-like structure, and the sound source corresponding to the pressure relief hole is located outside the cavity-like structure, forming the acoustic model shown in FIG4 .

[0050] FIG4 is a schematic diagram illustrating an exemplary arrangement of a cavity structure around one of the dual sound sources shown in some embodiments of this specification. As shown in FIG4 , the cavity-like structure 402 may include a listening position and at least one sound source 401A. The term "include" here may mean that at least one of the listening position and the sound source 401A is within the cavity-like structure 402, or at least one of the listening position and the sound source 401A is located at the inner edge of the cavity-like structure 402. The listening position may be equivalent to the entrance of the ear canal, an acoustic reference point of the ear such as the ear reference point (ERP) or the ear-drum reference point (DRP), or an entrance structure directed toward the listener. Because the sound source 401A is enclosed by the cavity-like structure 402, most of the sound radiated from it will reach the listening position through direct radiation or reflection. In contrast, in the absence of the cavity-like structure 402, most of the sound radiated from the sound source 401A will not reach the listening position. Therefore, the cavity structure significantly increases the volume of sound reaching the listening position. At the same time, only a small portion of the reverse-phase sound radiated by reverse-phase sound source 401B outside cavity-like structure 402 enters cavity-like structure 402 through leakage structure 403 within cavity-like structure 402. This is equivalent to generating a secondary sound source 401B' at leakage structure 403, whose intensity is significantly lower than that of sound source 401B and also significantly lower than that of sound source 401A. The sound generated by secondary sound source 401B' has a minimal effect of canceling out the reverse phase of sound source 401A within the cavity, significantly increasing the volume at the listening position. Regarding sound leakage, the radiation of sound source 401A through the cavity's leaky structure 403 is equivalent to the generation of a secondary sound source 401A' at leaky structure 403. Since almost all of the sound radiated by sound source 401A is output from leaky structure 403, and the scale of cavity-like structure 402 is much smaller than the spatial scale of the space in which the sound leakage is being evaluated (by at least an order of magnitude), the intensity of secondary sound source 401A' can be considered comparable to that of sound source 401A. For the external space, secondary sound source 401A' and sound source 401B form a dual sound source cancellation mechanism, reducing the sound leakage.

[0051] In a specific application scenario, the outer wall surface of the shell of the sound-emitting part 11 is usually a plane or a curved surface, while the contour of the user's concha 102 is an uneven structure. By extending part or all of the sound-emitting part 11 into the concha 102, a cavity-like structure connected to the outside world is formed between the sound-emitting part 11 and the contour of the concha 102. Furthermore, the sound outlet is set at a position where the shell of the sound-emitting part 11 faces the user's ear canal opening and close to the edge of the concha 102, and the pressure relief hole is set at a position where the sound-emitting part 11 is away from or far away from the ear canal opening, so as to construct the acoustic model shown in Figure 4, so that the user can improve the listening position at the ear opening when wearing headphones, and reduce the sound leakage effect in the far field.

[0052] Figure 5 is a schematic diagram of an exemplary projection of the earphone shown in Figure 3 onto the sagittal plane of a user. Referring to Figure 5 , in some embodiments, when worn, the first portion 121 of the ear hook 12 is positioned between the user's auricle and head, while the second portion 122 extends toward the side of the auricle facing away from the head and connects to the sound-emitting portion 11, placing the sound-emitting portion 11 near the ear canal without blocking the ear canal opening.

[0053] In some embodiments, the first portion 121 of the ear hook 12 includes a battery compartment 13. The battery compartment 13 houses a battery electrically connected to the sound-emitting portion 11. In some embodiments, the battery compartment 13 is located on the end of the first portion 121 away from the sound-emitting portion 11. The projection of the end of the ear hook 12 away from the sound-emitting portion 11 corresponds to the projection of the free end of the battery compartment 13 on the user's sagittal plane. In some embodiments, when the user wears the earphones 10, the sound-emitting portion 11 and the battery compartment 13 can be located on the front and back sides of the auricle, respectively.

[0054] It should be noted that when worn, the free end FE of the sound-producing portion 11 can not only extend into the concha, but can also project orthographically onto the antihelix, or onto the left and right sides of the head, in front of the ear on the sagittal axis. In other words, the ear hook 12 can support the sound-producing portion 11 in various locations, such as the concha, the antihelix, or the front of the ear.

[0055] In some embodiments, by designing the shape and size of the ear hook 12, the compatibility between the ear hook 12 and the user's ear can be improved, and the wearing stability and adjustability of the earphone 10 can be improved. At the same time, the ear hook 12 can also be adjusted to wear the sound-emitting part 11 to the specific position of the user's ear, thereby improving the listening effect of the earphone 10.

[0056] To facilitate understanding and description of the shape of the earphones 10 in both the non-worn and worn states, the earphones 10 can be projected onto a specific plane and described using parameters related to the projected shape on this plane. By way of example only, in the worn state, the earphones 10 can be projected onto the human sagittal plane to form a corresponding projected shape. In the non-worn state, a similar first plane can be selected based on the relative positional relationship between the human sagittal plane and the earphones 10, so that the projected shape of the earphones 10 on the first plane approximates the projected shape of the earphones 10 on the human sagittal plane. The first plane can be determined as follows: when the earhook 12 is placed on a flat support surface (such as a horizontal tabletop, ground plane, etc.), the support plane corresponds to the first plane of the earphones 10 when the earhook 12 is in contact with the support surface and positioned stably. Of course, to maintain consistency between the specific planes corresponding to the worn and non-worn states, the first plane can also be the human sagittal plane. In some embodiments, the first plane can also refer to the plane defined by the bisector that bisects or approximately bisects the earhook 12 along its length.

[0057] FIG6 is an exemplary schematic diagram of the first curve of the projection of the earphone shown in FIG3 on the sagittal plane of the user. In some embodiments, as shown in FIG6 , the first curve L1 in the projection of the earhook 12 on the sagittal plane of the user can be used as a reference curve of the earhook 12. In some embodiments, since the area where the earhook 12 contacts the user's ear when the earphone 10 is worn is mainly the inner contour of the earhook 12, the first curve L1 can be a reference curve corresponding to the inner contour of the projection of the earhook 12 on the sagittal plane of the user. In some embodiments, the inner side surface IS and / or the outer side surface OS of the sound-emitting portion 11 can be parallel to the sagittal plane of the user. Then the long axis direction Y of the sound-emitting portion 11 can correspond to the long axis direction Y of the projection of the sound-emitting portion 11 on the sagittal plane of the user, and the short axis direction Z of the sound-emitting portion 11 can correspond to the short axis direction Z of the projection of the sound-emitting portion 11 on the sagittal plane of the user. In some embodiments, in the long axis direction Y of the projection of the sound-emitting portion 11, the inner contour of the projection of the ear hook 12 on the user's sagittal plane corresponds to a curve having a leftmost end (point P') and a rightmost end (point Q'). The portion of the curve between point P' and point Q' of the inner contour of the projection of the ear hook 12 on the user's sagittal plane is the first curve L1. The actual position corresponding to point P' on the ear hook 12 is point P, and the actual position corresponding to point Q' on the ear hook 12 is point Q, as shown in FIG3 . By designing the features of the first curve L1 (such as extreme points, etc.), the shape and size of the ear hook 12 can be determined, thereby improving the fit between the ear hook 12 and the user's ear, improving the wearing stability and adjustability of the earphone 10, and adjusting the ear hook 12 to fit the sound-emitting portion 11 to the specific position of the user's ear, thereby improving the listening experience of the earphone 10.

[0058] Please refer to Figure 6. In some embodiments, the long axis direction Y of the projection of the sound-emitting part 11 on the sagittal plane can be used as the x-axis, the direction perpendicular to the x-axis is the y-axis, and the intersection of the x-axis and the y-axis is used as the origin o to establish a first rectangular coordinate system xoy. The first curve L1 can be regarded as a curve in the first rectangular coordinate system xoy.

[0059] In some embodiments, the y-axis direction can be referred to as the first direction, that is, the first direction is perpendicular to the long axis direction Y of the projection of the sound-emitting part 11 on the user's sagittal plane, and is toward the top of the user's head. In some embodiments, in the first rectangular coordinate system xoy, the first curve L1 has an extreme point N' in the first direction. By setting the positional relationship between the extreme point N' and other position points on the ear hook 12 and the sound-emitting part 11, the wearing condition of the earphone 10 (for example, the mechanical parameters when worn and the position of the sound-emitting part 11 relative to the ear when worn) can be adjusted. Referring to Figures 3, 5 and 6, in some embodiments, the extreme point N' is located on the back side of the vertex K on the ear hook 12 (represented by the projection point K' of the above vertex K on the user's sagittal plane). That is to say, on the projection of the ear hook 12 in the user's sagittal plane, the position of the extreme point N' is closer to the back of the user's head than the projection point K' of the upper vertex K.

[0060] In some embodiments, the upper vertex K of the ear hook 12 may be the highest point of the inner contour of the ear hook 12 along the vertical axis of the user in the wearing state, as shown in FIG3 . In some embodiments, when the user wears the earphone 10, the ear 100 may mainly support the earphone 10 through the upper vertex K of the ear hook 12. In some embodiments, the upper vertex K of the ear hook 12 may be the position where the inner contour of the ear hook 12 is most curved in the wearing state, as shown in FIG3 , FIG5 and FIG6 . In some embodiments, the upper vertex K of the ear hook 12 may be the point on the inner contour of the ear hook 12 that is farthest from the end of the ear hook 12 (i.e., the end of the first part 121, the free end of the battery compartment 13, and the end of the ear hook 12 that is not connected to the sound-emitting part 11) in the wearing state, as shown in FIG3 , FIG5 and FIG6 . In some embodiments, the position of the upper vertex K of the ear hook 12 may simultaneously meet one or more of the above three positions.

[0061] In some embodiments, the point corresponding to the extreme point N' on the earhook 12 is point N, as shown in FIG3 . In some embodiments, the angle between the earhook plane of the earhook 12 (e.g., plane S1 in FIG13 ) and the sagittal plane of the user can be comprehensively considered to determine the point N corresponding to the extreme point N' on the earhook 12.

[0062] As shown in Figure 3, when the earphone 10 is worn, the sound-emitting part 11 needs to extend into the concha cavity. The distance between the extreme point N of the ear hook and the upper vertex K in the long axis direction Y of the sound-emitting part 11 can affect the degree to which the sound-emitting part 11 extends into the concha cavity and the orientation of the sound-emitting part 11 in the concha cavity, thereby affecting the cavity-like structure formed by the sound-emitting part 11 extending into the concha cavity.

[0063] When the distance between the extreme point N of the ear hook and the upper vertex K in the long axis direction Y of the sound-emitting part 11 is too large, the fit between the first part 121 of the ear hook 12 and the ear 100 will deteriorate, thereby reducing the wearing stability of the earphone 10. Alternatively, the orientation of the sound-emitting part 11 in the cavum concha 102 (for example, the long axis direction Y) will be too close to the vertical axis, and the gap between the upper side surface US of the sound-emitting part 11 and the cavum concha will be too large, that is, the cavity-like opening formed is too large, and the sound source contained (that is, the sound outlet located on the inner side surface IS) directly radiates more sound components into the environment, and the sound reaching the listening position is smaller. At the same time, the sound from the external sound source entering the cavity-like will increase, resulting in the cancellation of near-field sound, and thus the deterioration of the listening effect.

[0064] If the distance between the earhook extreme point N and the upper vertex K along the long axis Y of the sound-emitting portion 11 is too small, the angle between the orientation of the sound-emitting portion 11 within the cavum concha (e.g., along the long axis Y) and the vertical axis will be too large. This will result in the gaps between the upper side surface US of the sound-emitting portion 11 and the cavum concha being too small or too few in number, resulting in a cavity-like opening that is too small or too few, and poor sound leakage reduction. Furthermore, if this distance is too small, the upper side surface US of the sound-emitting portion 11 may abut against the inner wall of the cavum concha, and may even excessively squeeze the user's cavum concha, causing discomfort and affecting the wearing comfort of the earphone 10.

[0065] Referring to Figures 3 and 6, in some embodiments, in the projection of the ear hook 12 on the user's sagittal plane, along the long axis Y of the sound-emitting portion 11, the distance between the extreme point N' and the projection point K' of the upper vertex K can be 6 mm to 15 mm. In some embodiments, since the x-axis is parallel to the long axis Y of the sound-emitting portion 11, the distance between the extreme point N' and the projection point K' of the upper vertex K along the long axis Y of the projection of the sound-emitting portion 11 can be the distance between the horizontal coordinate of the extreme point N' and the horizontal coordinate of the projection point K' of the vertex K. In some embodiments, to achieve a better listening experience, along the long axis Y of the projection of the sound-emitting portion 11, the distance between the extreme point N' and the projection point K' of the vertex K on the ear hook 12 on the user's sagittal plane can be 7 mm to 12 mm. In some embodiments, to further improve the sound leakage reduction effect, the distance between the extreme point N' and the projection point K' of the vertex K on the ear hook 12 on the user's sagittal plane along the long axis Y of the projection of the sound-emitting part 11 can be 8mm-11mm.

[0066] It should be noted that the method for measuring the relevant distances and angles of the projection of the earphone 10 on the user's sagittal plane can be: for the earphone 10, take a photo parallel to the projection plane (the user's sagittal plane), measure the relevant distances and angles on the photo, and then convert them according to the scale of the photo to obtain the actual data of the relevant distances and angles on the projection plane.

[0067] In some embodiments, in addition to reflecting the distance between the earhook extreme point N and the upper vertex K by the distance of the above-mentioned projection points, actual measurements can also be performed on the earhook 12. In some embodiments, the distance between the earhook extreme point N and the upper vertex K can be between 6mm and 12mm. In some embodiments, in order to further improve the sound leakage reduction effect, on the earhook 12, the distance between the earhook extreme point N and the upper vertex K can be between 7mm and 11mm. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the cavum concha have a more suitable volume and opening size / number, on the earhook 12, the distance between the earhook extreme point N and the upper vertex K can be between 8mm and 11mm.

[0068] FIG7 is a schematic diagram of an exemplary fitting function curve of the first curve shown in some embodiments of this specification. As shown in FIG6 and FIG7, in some embodiments, the extreme point N' of the first curve L1 can be determined by curve fitting. It should be noted that if the position of the coordinate origin of the xoy coordinate system changes (for example, the position of the x-axis and / or y-axis changes), the fitting function relationship of the first curve L1 will also change accordingly. As an example only, the x-axis of the xoy coordinate system is set at the long axis position of the projection of the sound-emitting part 11 (the long axis is the line connecting the two endpoints with the largest extension dimension in the shape of the projection of the sound-emitting part 11), and the y-axis is set at 13 mm behind the projection point K' of the upper vertex K. Then, in this xoy coordinate system, the first curve L1 is fitted by a univariate fourth-order polynomial function, and an exemplary fitting function relationship of the first curve L1 can be obtained: y = -0.0003059*x^4 - 0.002301*x^3 - 0.004005*x^2 + 0.07309*x + 23.39 (Relationship 1)

[0069] In some embodiments, in order to allow the image of the fitting function relationship to include the first curve L1, the value range of the independent variable x of the fitting function relationship can be larger to include the two endpoints of the first curve L1 (point P and point Q), so that the fitting function relationship can fully reflect the characteristics of the first curve L1. In some embodiments, the value range of the independent variable x of the fitting function relationship (i.e., Relationship 1) is [-20, 15], that is, -20≤x≤15. Furthermore, in order to reduce the portion of the image of the fitting function relationship (i.e., Relationship 1) that does not correspond to the first curve L1 so that the fitting function relationship can accurately reflect the characteristics of the first curve L1, the value range of the independent variable x of the fitting function relationship (i.e., Relationship 1) is [-18, 12], that is, -18≤x≤12.

[0070] By calculating the independent variable x0 corresponding to the first-order derivative y' = 0 of Equation 1, we can determine the abscissa of the extreme point N' of the first curve L1 in the xoy coordinate system (for details on how to determine the extreme point, please refer to the following related content). Substituting x0 into Equation 1, we can determine the coordinates of the extreme point N' in the xoy coordinate system. In Equation 1, the coordinates of the extreme point N' are (2.3544, 23.5005).

[0071] It should be noted that the functional relationship (e.g., Equation 1) of the first curve L1 obtained by polynomial fitting is an approximate expression of the first curve L1. When the number of sampling points fitting the functional relationship is large (e.g., greater than 10) and evenly distributed, the curve represented by the functional relationship can be considered to be the first curve L1. The functional relationships fitted in this specification are only examples and are mainly used to describe the characteristics of the first curve L1 (including extreme points, inflection points, first-order derivatives, second-order derivatives, etc.). The specific functional relationship (e.g., Equation 1) of the first curve L1 is related to the selection of the origin o of the coordinate system xoy. The functional relationship will also be different when the origin o is different. However, when the horizontal axis (x-axis) and vertical axis (y-axis) of the coordinate system remain unchanged, the relative positions of the curve features such as the extreme points and inflection points of the first curve L1 on the first curve L1 are fixed, and the properties of the first-order derivative and second-order derivative of the first curve L1 are also fixed and do not change with the position of the origin o of the coordinate system xoy. This specification is non-restrictive regarding the selection of the origin o of the coordinate system xoy used to fit the first curve L1 and the functional expression for the first curve L1. For example, to more conveniently determine the positional relationship between the extreme point and the upper vertex, the y-axis of the coordinate system xoy can be set to the projection point K' passing through the upper vertex K, and the functional expression for the first curve L1 will change accordingly.

[0072] In some embodiments, the first-order derivative y' and the second-order derivative y" of the functional relationship y of the first curve L1 can be further calculated. By calculating the horizontal coordinate x0 corresponding to the first-order derivative y'=0, and then judging the positive or negative value of the second-order derivative y" corresponding to x0, it can be determined whether the extreme point N' is a maximum point or a minimum point. If the value of the second-order derivative y" corresponding to x0 is greater than 0, the corresponding coordinate point (x0, y0) is a minimum point; if the value of the second-order derivative y" corresponding to x0 is less than 0, the corresponding coordinate point (x0, y0) is a maximum point. In some embodiments, the extreme point N' of the first curve L1 is a maximum point.

[0073] In some embodiments, the extreme point N' of the first curve L1 can also be determined by other means, such as determining the size of the function values ​​y and y0 corresponding to different values ​​in the interval near x0, determining the positive and negative differences in the value y' of the first-order derivative corresponding to different values ​​in the interval near x0 on both sides, etc. This specification does not impose too many restrictions on this.

[0074] In some embodiments, the extreme point N' of the first curve L1 can be determined by other means rather than fitting a functional relationship of the first curve L1. For example, a scale perpendicular to the longitudinal axis Y is used to move from point P' to point Q' of the first curve L1 along the longitudinal axis Y on the projection of the earphone 10 on the user's sagittal plane (the projection can be obtained by taking a photo facing the user's sagittal plane). During this movement, if the intersection of the first curve L1 and the scale has a maximum value on the scale, the intersection is the extreme point N' of the first curve L1.

[0075] FIG8 is a schematic diagram of an exemplary first-order derivative curve of a fitting curve according to some embodiments of the present specification. As shown in FIG8 , in some embodiments, for the first curve L1, it has a first-order derivative: y'=-0.0012236*x^3-0.006903*x^2-0.00801*x+0.07309 (Equation 2)

[0076] In some embodiments, the first derivative of the first curve L1 is continuous.

[0077] In some embodiments, the first-order derivative of the first curve L1 (i.e., equation 2) has a zero point (point A), i.e., y'=0 corresponds to a solution corresponding to the horizontal coordinate of point A. In some embodiments, according to equation 2, it can be determined that the coordinates of point A are (2.3544, 0). Substituting the horizontal coordinate of point A into equation 1 of the first curve L1, it can be seen that the point of the first curve L1 corresponding to the horizontal coordinate of point A is the maximum point of the first curve L1 in the xoy coordinate system. At the same time, this point is also the maximum point of the first curve L1, and this point can be recorded as the extreme point N' of the first curve L1.

[0078] In some embodiments, within the first rectangular coordinate system xoy, the first-order derivative of the first curve L1 has an inflection point. In some embodiments, within the first rectangular coordinate system xoy, the first-order derivative of the first curve L1 has a single inflection point, namely, point C. As shown in FIG8 , to the left of point C, the graph of the first-order derivative is concave; to the right of point C, the graph of the first-order derivative is convex. Point C, as the point where the concavity and convexity of the graph of the first-order derivative change, is the inflection point of the first-order derivative.

[0079] In some embodiments, within the first rectangular coordinate system xoy, the first curve L1 has extreme value points (points B1 and B2) on both sides of the inflection point, as shown in Figure 8. The first-order derivative of the first curve L1 is located above point B1 on both sides of the curve near point B1, that is, in the area on both sides of the first curve L1, the first-order derivative function value corresponding to point B1 is the smallest, and point B1 is the minimum point of the first-order derivative. The first-order derivative of the first curve L1 is located below point B2 on both sides of the curve near point B2, that is, in the area on both sides of the first curve L1, the first-order derivative function value corresponding to point B2 is the largest, and point B2 is the maximum point of the first-order derivative.

[0080] In some embodiments, the extreme point of the first-order derivative of the first curve L1 can also be determined based on the second-order derivative and the third-order derivative of the first curve L1. For details, please refer to the method for determining the extreme point of the first curve L1, which will not be repeated here.

[0081] In some embodiments, according to equation 2, the coordinates of point B1 can be determined to be (-3.0442, 0.0680), and the coordinates of point B2 can be determined to be (-0.7168, 0.0757).

[0082] FIG9 is a schematic diagram of an exemplary second-order derivative curve of a fitting curve according to some embodiments of the present specification. As shown in FIG9 , in some embodiments, for the first curve L1, it has a second-order derivative: y″=-0.0036708*x^2-0.013806*x-0.00801 (Equation 3)

[0083] In some embodiments, the second-order derivative of the first curve L1 is internally continuous.

[0084] In some embodiments, within the first rectangular coordinate system xoy, the second-order derivative of the first curve L1 has a maximum point, namely, point D1. As shown in FIG9 , the second-order derivative of the fitting curve L2, on both sides of point D1, is located below point D1. That is, within the region on both sides of point D1, the second-order derivative function value corresponding to point D1 is the largest, and point D1 is the maximum point of the second-order derivative.

[0085] In some embodiments, the second-order derivative of the first curve L1 has two zero points (point D2 and point D3), and the horizontal coordinate of point D2 corresponds to the horizontal coordinate of the extreme point B1 of the first-order derivative, which is x = -0.30442; the horizontal coordinate of point D3 corresponds to the horizontal coordinate of the extreme point B2 of the first-order derivative, which is x = -0.7168.

[0086] In some embodiments, as shown in FIG3 , the sound-emitting portion 11 and the ear hook 12 can jointly clamp the ear 100 from the front and back sides of the ear 100 (for example, the concha cavity 102 ), and the clamping force formed is mainly manifested as compressive stress, which is beneficial to improving the stability and comfort of the earphone 10 when worn.

[0087] In some embodiments, the earhook 12 of the headphone 10 has a variable cross-sectional structure, with the cross-sectional area of ​​the earhook 12 being minimized at the point N corresponding to the extreme point N' of the first curve L1 on the earhook. A variable cross-sectional structure refers to locations or regions along the earhook 12 with varying cross-sectional shapes or sizes. By configuring the earhook 12 with a variable cross-sectional structure, the cross-sectional area of ​​the earhook 12 can be customized to meet the needs of fitting the ear 100 at different locations.

[0088] In some embodiments, due to the limited space between the user's ear and head, the cross-section of the ear hook 12 corresponding to the arc segment near the ear hook extreme point N (for example, the arc segment within 5 mm in length on both sides of the ear hook extreme point N) can be designed to be smaller than the cross-section of other parts, so that the ear hook 12 as a whole presents a shape that is thin in the middle and thick on both sides, so that the ear hook 12 can be better accommodated in the space between the user's ear and head, which is conducive to the wearing comfort of the earphone 10.

[0089] In some embodiments, the cross-section at the corresponding point N on the earhook of the extreme point N' can be set to the minimum. When the earphone 10 changes from a non-wearing state to a wearing state, the sound-emitting portion 11 and the end of the earhook 12 away from the sound-emitting portion 11 (for example, the battery compartment) may be stretched. At this time, the earhook 12 generates a large strain at the corresponding point N on the earhook of the extreme point N', causing this point to form a clamping fulcrum when worn. It should be noted that the position with the minimum cross-section at the corresponding point N on the earhook of the extreme point N' does not need to be completely accurate. Within the range allowed by engineering errors, this position can be within 3 mm of the corresponding point N on the earhook of the extreme point N'.

[0090] The clamping fulcrum referred to herein can be understood as the point on the earhook 12 that contacts the auricle and provides support for the earphone when worn. Considering the continuous area of ​​the earhook 12 that contacts the auricle and provides support on the side facing the head, for ease of understanding, in some embodiments, the corresponding point N on the earhook of the extreme point N' of the earhook 12 located within this area can be considered the clamping fulcrum.

[0091] In some embodiments, the direction of the clamping force can be the direction of the line connecting the two clamping points (or the center points of the clamping surface) where the earphone clamps on either side of the auricle. When the shape and size of the sound-producing portion 11 are constant, the direction of the clamping force is closely related to the orientation of the sound-producing portion 11 within the cavum concha 102 and the depth of its insertion into the cavum concha 102. Furthermore, to ensure a more secure fit, the direction of the clamping force should be kept consistent or approximately consistent with the direction of the pressure exerted by the sound-producing portion 11 on the cavum concha 102 and the pressure exerted by the earhook clamping point E on the back of the ear. This prevents relative movement between the sound-producing portion 11 and the earhook 12. Therefore, the direction of the clamping force can also affect the wearing stability of the earphone. Because the area of ​​the back of the ear 100 facing the cavum concha 102 is limited, and the direction of pressure exerted by the earhook 12 on the ear 100 in this area is typically parallel or approximately parallel to the user's sagittal plane, the angle between the direction of the clamping force and the user's sagittal plane needs to be maintained within a certain range. In other words, the direction of the clamping force should be parallel or approximately parallel to the user's sagittal plane. If the angle deviates too much from 0°, the gap between the inner side IS of the sound-emitting portion 11 and the cavum concha 102 will be too large, resulting in an overly large opening of the quasi-cavity. Consequently, the contained sound source (i.e., the sound outlet located on the inner side IS) will radiate more sound directly into the environment, resulting in less sound reaching the listening position. Simultaneously, more sound from external sources will enter the quasi-cavity, causing near-field sound cancellation and, in turn, a lower listening index. Alternatively, the position of the sound-emitting portion 11 within the cavum concha 102 may be shifted toward the side of the ear 100 facing the head, with the inner side IS of the sound-emitting portion 11 abutting the upper edge of the cavum concha 102. The gap between the inner side IS of the sound-emitting portion 11 and the cavum concha 102 may be too small or too few, even completely isolating the interior from the external environment, resulting in poor sound leakage reduction. Furthermore, if the angle deviates too much from 0°, the wearing stability of the earphone 10 may be poor, making it more susceptible to shaking. The listening index can be calculated as the inverse of the sound leakage index α, 1 / α, to evaluate the effectiveness of various configurations. It means the size of the listening volume when the sound leakage is the same. From the application point of view, the listening index should be as large as possible. If the gap is too small (that is, the opening of the cavity-like body is too small), the sound leakage reduction effect is poor. If too few gaps are formed, the number of openings of the cavity-like body will be small. The cavity structure with more openings can better improve the resonant frequency of the air sound in the cavity structure compared to the cavity structure with fewer openings, so that the entire device has a better listening index in the high frequency band (for example, sounds with a frequency close to 10,000 Hz) compared to the cavity structure with fewer openings. In addition, the high frequency band is the frequency band that the human ear is more sensitive to, so there is a greater demand for sound leakage reduction. Therefore, if too few gaps are formed, the sound leakage reduction effect in the high frequency band cannot be improved. It should be noted that the direction of the clamping force can be obtained by attaching a force sensor (such as a strain gauge) or a force sensor array on the side of the auricle facing the head and the side of the auricle away from the head, and reading the force distribution at the clamped position of the auricle.For example, if there is a point where force can be measured on the side of the auricle facing the head and the side of the auricle facing away from the head, the direction of the clamping force can be considered to be the direction of the line connecting the two points.

[0092] In some embodiments, in order to meet wearing requirements, the angle between the direction of the clamping force and the sagittal plane of the user is in the range of -30°-30°. In some embodiments, in order to improve the listening index, the angle between the direction of the clamping force and the sagittal plane of the user is in the range of -20°-20°. In some embodiments, in order to further improve the sound leakage reduction effect, the angle between the direction of the clamping force and the sagittal plane of the user is in the range of -10°-10°. In some embodiments, in order to further increase the wearing stability of the earphone 10, the angle between the direction of the clamping force and the sagittal plane of the user is in the range of -8°-8°. In some embodiments, the direction of the clamping force can be controlled by designing the curved configuration of the ear hook 12, and / or designing the shape and size of the sound-emitting part 11, and / or designing the position of the center C of the clamping area.

[0093] In some embodiments, as shown in FIG3 , when worn, as viewed along the coronal axis of the human body, the connection end CE is closer to the top of the head than the free end FE, allowing the free end FE to extend into the cavum concha 102. Therefore, the angle between the long axis Y and the sagittal axis of the human body needs to be maintained within a certain range. When the shape and size of the sound-emitting portion 11 are uniform, if the angle is too small, the upper side US of the sound-emitting portion 11 will fit closely with the upper edge of the cavum concha 102, and the gap between the upper side US and the cavum concha 102 will be too small or too few, resulting in poor sound leakage reduction and the sound outlet on the sound-emitting portion 11 being too far from the external auditory canal 101. When the shape and size of the sound-emitting portion 11 are uniform, if the angle is too large, the gap between the upper side US of the sound-emitting portion 11 and the cavum concha 102 will be too large, resulting in an excessively large cavity-like opening, which will reduce the hearing index.

[0094] In some embodiments, to provide a better listening index when the earphones are worn, the angle between the long axis Y and the direction of the human sagittal axis can be in the range of 15° to 60°. In some embodiments, to further improve the sound leakage reduction effect, the angle between the long axis Y and the direction of the human sagittal axis can be in the range of 20° to 50°. In some embodiments, to ensure that the sound hole has an appropriate distance from the external auditory canal 101, the angle between the long axis Y and the direction of the human sagittal axis can be in the range of 23° to 46°.

[0095] In order to further measure the clamping force provided by the ear hook 12 when worn, this specification defines the degree of difficulty of deformation of the ear hook 12 based on the clamping fulcrum as the clamping coefficient based on the clamping fulcrum. In some embodiments, the value range of the clamping coefficient of the ear hook 12 based on the clamping fulcrum needs to be maintained within a certain range. If the aforementioned clamping coefficient is too large, it will lead to excessive clamping force when worn, a strong sense of pressure on the user's ear 100, and it will be difficult to adjust the wearing position after wearing. It may also cause the upper side US of the sound-emitting part 11 to fit the upper edge of the cavum concha 102, and the gap between the sound-emitting part 11 and the cavum concha 102 is too small or too few, resulting in poor sound leakage reduction effect. If the aforementioned clamping coefficient is too small, it will cause the ear hook 12 to be worn unstably, the sound-emitting part 11 is easy to separate from the auricle, and it is easy to cause the gap between the sound-emitting part 11 and the cavum concha 102 to be too large, that is, the cavity-like opening formed is too large, resulting in a smaller listening index.

[0096] In some embodiments, in order to meet wearing requirements, the clamping coefficient of the ear hook 12 based on the clamping fulcrum is in the range of 10N / m-30N / m. In some embodiments, in order to increase adjustability after wearing, the clamping coefficient of the ear hook 12 based on the clamping fulcrum is in the range of 11N / m-26N / m. In some embodiments, in order to increase stability after wearing, the clamping coefficient of the ear hook 12 based on the clamping fulcrum is in the range of 15N / m-25N / m. In some embodiments, in order to make the earphones have a better listening index when worn, the clamping coefficient of the ear hook 12 based on the clamping fulcrum is in the range of 17N / m-24N / m. In some embodiments, in order to further improve the sound leakage reduction effect, the clamping coefficient of the ear hook 12 based on the clamping fulcrum is in the range of 18N / m-23N / m. The clamping coefficient of the ear hook 12 based on the clamping fulcrum can reflect the difficulty of stretching the sound-emitting part 11 away from the ear hook 12. In some embodiments, the clamping coefficient of the ear hook 12 based on the clamping fulcrum can be expressed as the relationship between the distance between the sound-emitting portion 11 and the ear hook 12 when the ear hook is worn and the clamping force generated by the ear hook 12 to drive the sound-emitting portion 11 to approach the first part of the ear hook. It should be noted that the distance between the sound-emitting portion 11 and the ear hook 12 can be the change in the distance between the sound-emitting portion 11 and the ear hook 12 along the long axis Y of the sound-emitting portion from the non-wearing state to the wearing state; the value range of the clamping coefficient of the ear hook 12 based on the clamping fulcrum can be determined by the following exemplary method, and the ear hook 12 can be equivalent to a spring. The specific relationship between the distance between the sound-emitting portion 11 and the clamping force of the spring is shown in formula (1): F = kx, (1)

[0097] Among them, F represents the clamping force, k represents the clamping coefficient, and x represents the pull-off distance.

[0098] Based on the above formula (1), the clamping coefficient can be determined by the following method: using a tensioner to measure the clamping force corresponding to different pull-out distances, determine at least one set of clamping force and pull-out distance. Substitute at least one set of clamping force and corresponding pull-out distance into formula (1) to determine at least one intermediate clamping coefficient. Then calculate the average value of at least one intermediate clamping coefficient, and use the average value as the clamping coefficient. Alternatively, use a tensioner to measure the clamping force when the pull-out distance is stretched in a normal wearing state to determine the clamping force. Substitute the clamping force and pull-out distance into formula (1) to determine the clamping coefficient.

[0099] In some embodiments, when in the wearing state, the ear hook 12 generates a clamping force that drives the sound-emitting part 11 to approach the first part of the ear hook, and the clamping force needs to be maintained within a certain range. It should be noted that the clamping force can be measured by a tensioner to measure the clamping force corresponding to the preset distance, and the preset distance is the distance under standard wearing conditions; the clamping force can also be obtained by attaching force sensors (such as strain gauges) or force sensor arrays on the side of the auricle facing the head and the side of the auricle away from the head, and reading the force value at the clamped position of the auricle. For example, if force can be measured at two points corresponding to the same position on the side of the auricle facing the head and the side of the auricle away from the head, the magnitude of the force (such as any one of the two forces) can be used as the clamping force. If the clamping force is too low, the ear hook 12 and the sound-emitting portion 11 will not be able to effectively clamp the earphones 100 on the front and back sides, resulting in poor wearing stability. Furthermore, when the sound-emitting portion 11 cannot effectively clamp the cavum concha 102, the gap between the sound-emitting portion 11 and the cavum concha 102 will be too large, i.e., the cavity-like opening formed will be too large, resulting in a lower listening index. If the clamping force is too high, the earphones 10 will feel strongly pressed against the ear 100 when worn, making it difficult to adjust the wearing position after wearing. Moreover, if the aforementioned clamping force is too great, the sound-producing part 11 will exert too much pressure on the cavum concha 102, which will increase the tendency of the sound-producing part 11 to rotate around the clamping fulcrum. The clamping area of ​​the sound-producing part 11 may slide toward the position of the clamping fulcrum, causing the sound-producing part 11 to be unable to be in the expected position in the cavum concha 102, that is, the side wall of the sound-producing part 11 may fit into the upper edge of the cavum concha 102, so that the gap between the side wall of the sound-producing part 11 and the cavum concha 102 is too small or too few, resulting in a poor sound leakage reduction effect.

[0100] In some embodiments, to meet wearing requirements, the clamping force generated by the ear hook 12 to drive the sound-emitting portion 11 close to the first part of the ear hook can be in the range of 0.03N-1N. In some embodiments, to increase adjustability after wearing, the clamping force generated by the ear hook 12 to drive the sound-emitting portion 11 close to the first part of the ear hook can be in the range of 0.05N-0.8N. In some embodiments, to increase stability after wearing, the clamping force generated by the ear hook 12 to drive the sound-emitting portion 11 close to the first part of the ear hook can be in the range of 0.2N-0.75N. In some embodiments, to make the earphones have a better listening index when worn, the clamping force generated by the ear hook 12 to drive the sound-emitting portion 11 close to the first part of the ear hook can be in the range of 0.3N-0.7N. In some embodiments, to further improve the effect of reducing sound leakage, the clamping force generated by the ear hook 12 to drive the sound-emitting portion 11 close to the first part of the ear hook can be in the range of 0.35N-0.6N.

[0101] In some embodiments, the distance between the extreme point N' and the projection point K' of the earhook's apex K on the user's sagittal plane affects the clamping force exerted by the sound-producing portion 11 and the earhook 12 on the auricle. Specifically, because the clamping fulcrum is located at the corresponding point N of the extreme point N' on the earhook, and the earhook's apex K is the highest point of the earhook's inner contour along the user's vertical axis when worn, the distance between the extreme point N' and the projection point K' of the earhook's apex K on the user's sagittal plane affects the position of the extreme point N' relative to the user's cavum concha 102. When the earphone 10 is clamped to the user's cavum concha 102, the position of the extreme point N' affects the magnitude of the force arm of the "clamping force lever," and further, the magnitude of the force arm of the "clamping force lever" affects the magnitude of the clamping force. Specifically, the smaller the distance between the extreme point N' and the projection point K' of the earhook's upper vertex K on the user's sagittal plane, the higher the extreme point N' is relative to the user's ear (or the cavum concha 102), the larger the lever arm of the "clamping force lever," and the smaller the clamping force. The larger the distance between the extreme point N' and the projection point K' of the earhook's upper vertex K on the user's sagittal plane, the lower the extreme point N' is relative to the user's ear (or the cavum concha 102), the smaller the lever arm of the "clamping force lever," and the larger the clamping force. The "clamping force lever" refers to a lever that clamps the user's ear (e.g., the front and back sides of the cavum concha 102) with the extreme point N' as its fulcrum (fixed point). In some embodiments, in order to improve the wearing comfort and stability of the earphone 10, the distance between the extreme point N' and the projection point K' of the vertex K on the ear hook on the sagittal plane of the user is between 6mm-15mm. Correspondingly, the clamping force generated by the ear hook 12 to drive the sound-emitting part 11 close to the first part of the ear hook can range from 0.03N to 1N.

[0102] Figure 10 is another exemplary structural diagram of the earphone shown in Figure 3 . In conjunction with Figures 3 and 4 , in some embodiments, the sound-emitting portion 11 may include a transducer and a housing for housing the transducer. The housing has an inner side surface IS facing the ear 100 along the thickness direction X when worn, an outer side surface OS facing away from the ear 100, and a connecting surface connecting the inner side surface IS and the outer side surface OS. It should be noted that when worn, as viewed along the coronal axis (i.e., the thickness direction X), the sound-emitting portion 11 may be configured in a circular, elliptical, rounded square, or rounded rectangular shape. When the sound-emitting portion 11 is configured in a circular, elliptical, or other shape, the connecting surface may refer to the curved side surface of the sound-emitting portion 11. When the sound-emitting portion 11 is configured in a rounded square, rounded rectangular, or other shape, the connecting surface may include the lower side surface LS, upper side surface US, and rear side surface RS mentioned below. Therefore, for ease of description, this embodiment uses the rounded rectangular shape of the sound-emitting portion 11 as an example for illustrative purposes. The length of the sound-emitting portion 11 in the long-axis direction Y may be greater than the width of the sound-emitting portion 11 in the short-axis direction Z. As shown in FIG10 , the sound-emitting portion 11 may have an upper side surface US facing away from the external auditory canal 101 along the short-axis direction Z when worn, a lower side surface LS facing the external auditory canal 101, and a rear side surface RS connecting the upper side surface US and the lower side surface LS. The rear side surface RS is located at the end facing the back of the head in the long-axis direction Y when worn, and is at least partially located in the cavum concha 102.

[0103] Furthermore, at least a portion of the housing can be inserted into the user's cavum concha 102. The at least portion inserted into the user's cavum concha 102 includes at least one clamping region that contacts the sidewalls of the user's cavum concha 102. This clamping region can be located at the free end FE of the sound-emitting portion 11. In some embodiments, the orthographic projection of the earhook 12 on a reference plane perpendicular to the longitudinal axis Y (e.g., the XZ plane in FIG. 10 ) partially overlaps with the orthographic projection of the free end FE on the same reference plane (as indicated by the shaded portion on the rear side RS in the figure). The clamping region can be defined as the region on the rear side RS where the projections overlap on the reference plane. The overlapping region formed by the orthographic projection of the earhook 12 on the aforementioned reference plane and the orthographic projection of the free end FE on the same reference plane is located between the inner side IS and the outer side OS in the thickness direction X. In this manner, the sound-emitting portion 11 and the earhook 12 can jointly clamp the ear 100 from both the front and rear sides. Furthermore, the resulting clamping force is primarily compressive, which helps improve the stability and comfort of the acoustic device 10 when worn. It is understood that when the sound-emitting portion 11 is configured in a circular, elliptical, or other shape, the clamping area can be defined as the area on the connecting surface (the curved side surface of the sound-emitting portion 11) corresponding to the overlapping area. The clamping area can be the area on the sound-emitting portion 11 that is used to clamp the cavum concha 102. However, due to individual differences between users, resulting in different shapes, sizes, and other dimensional differences in the ear 100, the clamping area does not necessarily clamp the cavum concha 102 when actually worn. However, for most users and the aforementioned standard ear 100 model, the clamping area can clamp the user's cavum concha 102 when worn.

[0104] In some embodiments, the clamping area and / or the inner side of the clamping area is provided with a flexible material. For details about the flexible material, please refer to other contents in this specification, for example, FIG. 20 and its corresponding specification.

[0105] The center C of the clamping area refers to a point that can represent the clamping area and is used to describe the position of the clamping area relative to other structures. In some embodiments, the center C of the clamping area can be used to characterize the position where the clamping area exerts the greatest force on the ear 100 under standard wearing conditions. The standard wearing condition can be the situation where the earphones are correctly worn on the aforementioned standard ear model according to the wearing specifications. In some embodiments, when the sound-emitting part 11 is set to a regular shape such as a circle, an ellipse, a rounded square, a rounded rectangle, etc., the intersection of the long axis of the sound-emitting part and the clamping area can be defined as the center C of the clamping area. It should be noted that the long axis of the sound-emitting part can be the central axis of the sound-emitting part 11 along the aforementioned long axis direction Y. The center C of the clamping area can be determined in the following way: determine the intersection of the orthographic projection of the sound-emitting part 11 on a reference plane perpendicular to the long axis direction Y (such as the XZ plane in Figure 11) and the orthographic projection of the central axis on the same reference plane, and the center C of the clamping area can be defined as the point on the sound-emitting part 11 that forms the above-mentioned intersection on the reference plane. In other embodiments, when the long axis of the sound-emitting portion 11 is difficult to determine (for example, the sound-emitting portion 11 is configured to be an irregular shape), as shown in FIG11 , the center C of the clamping area can be defined as the intersection of the free end FE and the tangent plane of the end of the ear hook 12 away from the sound-emitting portion 11 (for example, the battery compartment) and the free end FE. The center C of the clamping area can be determined by determining the tangent line T of the orthographic projection of the sound-emitting portion 11 on a reference plane perpendicular to the thickness direction X (for example, the YZ plane in FIG11 ) and the orthographic projection of the end of the ear hook 12 away from the sound-emitting portion 11 (for example, the battery compartment) on the same reference plane, and determining the intersection of the tangent line T on the reference plane and the orthographic projection of the free end FE. The center C of the clamping area can be defined as the point on the free end FE forming the above-mentioned intersection on the reference plane.

[0106] In some embodiments, once the shape and size of the sound-generating portion 11 are determined, the distance between the projection point C' of the clamping region center C on the user's sagittal plane and the extreme point N', or the distance between the projection point C' of the clamping region center C on the user's sagittal plane and the projection point K' of the upper vertex K on the user's sagittal plane, can be designed to simultaneously change the coverage position of the sound-generating portion 11 in the cavum concha 102 when worn, as well as the clamping position of the sound-generating portion 11 clamping the cavum concha 102 (or even the tragus near the cavum concha 102). This can not only affect the stability and comfort of the user wearing the earphones, but also affect the listening experience of the earphones. That is, when worn, the distance between the projection point C' of the clamping region center C on the user's sagittal plane and the extreme point N', or the distance between the projection point C' of the clamping region center C on the user's sagittal plane and the projection point K' of the upper vertex K on the user's sagittal plane, needs to be maintained within a certain range. When the shape and size of the sound-emitting portion 11 are uniform, if the aforementioned distance is too large, the sound-emitting portion 11 will be positioned lower within the cavum concha 102, and the gap between the upper side US of the sound-emitting portion 11 and the cavum concha 102 will be too large, which will in turn lead to a lower listening index. When the shape and size of the sound-emitting portion 11 are uniform, if the aforementioned distance is too small, the upper side US of the sound-emitting portion 11 will be closely aligned with the upper edge of the cavum concha 102, and the gaps between the upper side US and the cavum concha 102 will be too small or too few, even completely isolating the interior from the external environment, failing to form a cavity-like structure and resulting in poor sound leakage reduction.

[0107] In some embodiments, in order to make the earphones have a better listening index when worn, in the worn state, the distance between the projection point C' of the clamping area center C on the sagittal plane of the user and the extreme point N' can be 20mm-40mm. In some embodiments, in order to further improve the sound leakage reduction effect, in the worn state, the distance between the projection point C' of the clamping area center C on the sagittal plane of the user and the extreme point N' can be 23mm-35mm. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the concha cavity 102 have a more suitable volume and opening size / number, in the worn state, the distance between the projection point C' of the clamping area center C on the sagittal plane of the user and the extreme point N' can be 25mm-32mm.

[0108] In some embodiments, in order to make the earphones have a better listening index when worn, in the worn state, the distance between the projection point C' of the clamping area center C on the user's sagittal plane and the projection point K' of the upper vertex K on the user's sagittal plane can be 25mm-40mm. In some embodiments, in order to further improve the sound leakage reduction effect, in the worn state, the distance between the projection point C' of the clamping area center C on the user's sagittal plane and the projection point K' of the upper vertex K on the user's sagittal plane can be 30mm-38mm. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the concha cavity 102 have a more suitable volume and opening size / number, in the worn state, the distance between the projection point C' of the clamping area center C on the user's sagittal plane and the projection point K' of the upper vertex K on the user's sagittal plane can be 32mm-36mm.

[0109] In some embodiments, once the shape and size of the sound-generating portion 11 are determined, by designing the distance between the center C of the clamping area and the corresponding point N of the extreme point N' on the earhook 12, or the distance between the center C of the clamping area and the upper vertex K, when not worn, the coverage position of the sound-generating portion 11 within the cavum concha 102 when worn, as well as the clamping position of the sound-generating portion 11 clamping the cavum concha 102 (or even the tragus near the cavum concha 102), can be simultaneously changed. This can not only affect the stability and comfort of the user wearing the earphones, but also affect the listening experience of the earphones. That is, when not worn, the distance between the center C of the clamping area and the corresponding point N of the extreme point N' on the earhook 12, or the distance between the center C of the clamping area and the upper vertex K, needs to be maintained within a certain range. It should be noted that the distance between different points on the earphone 10 in three-dimensional space can be measured using an appropriate method based on actual conditions. For example, for an earphone 10 not in its worn state, after determining the positions of two points on the earhook 12 to be measured, the distance between the two points can be directly measured using a ruler. For an earphone 10 in its worn state, the relative positions of the various components of the earphone 10 can be fixed, and then the earphone 10 can be removed from the ear (or the ear model used for wearing can be removed). This simulates the shape of the earphone 10 when worn, and also facilitates subsequent direct measurement of the distances between different points on the earhook 12 using a ruler. In some cases, given that the distances between different points on the earhook 12 in three-dimensional space are close to the distances between the projections of these points on the sagittal plane or the first plane (e.g., the difference between the two is no more than 10%), the distances between the projections of these points on the sagittal plane or the first plane can also be considered as the distances in three-dimensional space. Based on this, for the earphone 10, a photograph can be taken parallel to the projection plane (sagittal plane or first plane), the relevant distances can be measured on the photograph, and then converted according to the scale of the photograph to obtain the relevant distances on the projection plane. When the shape and size of the sound-emitting portion 11 are consistent, if the aforementioned distance (i.e., the distance between the center C of the clamping area and the corresponding point N of the extreme point N' on the ear hook 12 when not worn, or the distance between the center C of the clamping area and the upper vertex K) is too large, the sound-emitting portion 11 will be positioned lower within the cavum concha 102, and the gap between the upper side surface US of the sound-emitting portion 11 and the cavum concha 102 will be too large, which will in turn lead to a lower listening index. When the shape and size of the sound-emitting portion 11 are consistent, if the aforementioned distance is too small, the upper side surface US of the sound-emitting portion 11 will fit closely with the upper edge of the cavum concha 102, and the gap between the upper side surface US and the cavum concha 102 will be too small or too few, or even the interior will be completely sealed off from the external environment, and a cavity-like structure will not be formed, resulting in poor sound leakage reduction.

[0110] In some embodiments, to provide a better listening index when the earphones are worn, the distance between the center C of the clamping area and the corresponding point N of the extreme point N' on the ear hook 12 can be 20 mm to 35 mm when the earphones are not worn. In some embodiments, to further improve the sound leakage reduction effect, the distance between the center C of the clamping area and the corresponding point N of the extreme point N' on the ear hook 12 can be 22 mm to 30 mm when the earphones are not worn. In some embodiments, to provide a more appropriate volume and opening size / number for the cavity-like structure formed by the sound-emitting portion 11 and the cavum conchae 102, the distance between the center C of the clamping area and the corresponding point N of the extreme point N' on the ear hook 12 can be 26 mm to 29 mm when the earphones are not worn.

[0111] In some embodiments, to improve the listening experience when the earphones are worn, the distance between the center C of the clamping area and the upper vertex K can be 25mm-40mm when not worn. In some embodiments, to further improve sound leakage reduction, the distance between the center C of the clamping area and the upper vertex K can be 27mm-35mm when not worn. In some embodiments, to ensure that the cavity-like structure formed by the sound-emitting portion 11 and the cavum concha 102 has a more appropriate volume and opening size / number, the distance between the center C of the clamping area and the upper vertex K can be 30mm-33mm when not worn.

[0112] In some embodiments, after the shape and size of the generating portion 11 are determined, in the wearing state, the difference between the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane can reflect the positional relationship between the extreme point N' and the projection point K' of the earhook upper vertex K on the user's sagittal plane (for example, the distance between the extreme point N' and the projection point K' of the earhook upper vertex K on the user's sagittal plane). Since the earhook upper vertex K is the highest point of the earhook inner contour along the user's vertical axis in the wearing state, the positional relationship between the extreme point N' and the projection point K' of the earhook upper vertex K on the user's sagittal plane can reflect the positional relationship of the extreme point N' relative to the user's ear when the user wears the earphones. In the non-wearing state, the difference between the distance from the center C of the clamping area to the corresponding point N of the extreme point N' on the ear hook 12 and the distance from the center C of the clamping area to the upper vertex K can also reflect the positional relationship between the corresponding point N of the extreme point N' on the ear hook 12 and the upper vertex K of the ear hook (for example, the distance between the corresponding point N of the extreme point N' on the ear hook 12 and the upper vertex K of the ear hook). The positional relationship between the corresponding point N of the extreme point N' on the ear hook 12 and the upper vertex K of the ear hook can also reflect the positional relationship between the corresponding point N of the extreme point N' on the ear hook 12 relative to the user's ear when the user wears the earphones. The greater the aforementioned difference (i.e., in the wearing state, the difference between the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane, or, in the non-wearing state, the difference between the distance from the clamping area center C to the corresponding point N of the extreme point N' on the ear hook 12 and the distance from the clamping area center C to the upper vertex K) is, the greater the distance between the extreme point N' and the projection point K' of the ear hook upper vertex K on the user's sagittal plane is, or The greater the distance between the corresponding point N of the extreme point N' on the earhook 12 and the vertex K on the earhook, the lower the position of the extreme point N' relative to the ear when the user wears the earphones, the smaller the force arm of the "clamping force lever" and the greater the clamping force; the smaller the aforementioned difference, the smaller the distance between the extreme point N' and the projection point K' of the vertex K on the user's sagittal plane, or the smaller the distance between the corresponding point N of the extreme point N' on the earhook 12 and the vertex K on the earhook, the higher the position of the extreme point N' relative to the ear when the user wears the earphones, the larger the force arm of the "clamping force lever" and the smaller the clamping force.

[0113] In some embodiments, in the worn state, the difference between the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane, or in the non-worn state, the difference between the distance from the clamping area center C to the corresponding point N on the ear hook 12 of the extreme point N' and the distance from the clamping area center C to the upper vertex K, needs to be maintained within a certain range. If the aforementioned difference is too small, the clamping force will be too small in the worn state, and the ear hook 12 and the sound-emitting portion 11 will not be able to effectively clamp the front and back sides of the ear 100, resulting in poor wearing stability. Moreover, when the sound-emitting portion 11 cannot effectively clamp the cavum concha 102, the gap between the sound-emitting portion 11 and the cavum concha 102 will be too large, that is, the cavity-like opening formed will be too large, resulting in a reduced listening index. If the aforementioned difference is too large, the clamping force will be too strong when the earphone 10 is worn, causing a strong sense of pressure on the user's ear 100 while being worn, making it difficult to adjust the wearing position after wearing. Furthermore, a large difference will cause the sound-producing portion 11 to exert excessive pressure on the cavum concha 102, increasing the tendency of the sound-producing portion 11 to rotate about the clamping fulcrum. The clamping area of ​​the sound-producing portion 11 may slide toward the location of the clamping fulcrum, causing the sound-producing portion 11 to lose its intended position in the cavum concha 102. In this case, the sidewalls of the sound-producing portion 11 may abut against the upper edge of the cavum concha 102, resulting in a small or insufficient gap between the sidewalls of the sound-producing portion 11 and the cavum concha 102, resulting in poor sound leakage reduction.

[0114] In some embodiments, in order to meet wearing requirements, in the wearing state, the difference between the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane can be in the range of 2mm-6mm. In some embodiments, in order to increase the adjustability after wearing and further improve the sound leakage reduction effect, in the wearing state, the difference between the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane can be in the range of 2.2mm-5mm. In some embodiments, in order to increase the stability after wearing and make the headphones have a better listening index when worn, in the worn state, the difference between the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the distance from the projection point C' of the clamping area center C on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane can be in the range of 3mm-4.8mm.

[0115] In some embodiments, in order to meet the wearing requirements, in the non-wearing state, the difference between the distance from the center C of the clamping area to the corresponding point N of the extreme point N' on the ear hook 12 and the distance from the center C of the clamping area to the upper vertex K can be in the range of 2mm-6mm. In some embodiments, in order to increase the adjustability after wearing and further improve the sound leakage reduction effect, in the non-wearing state, the difference between the distance from the center C of the clamping area to the corresponding point N of the extreme point N' on the ear hook 12 and the distance from the center C of the clamping area to the upper vertex K can be in the range of 2.2mm-5.2mm. In some embodiments, in order to increase the stability after wearing and make the earphones have a better listening index in the wearing state, in the non-wearing state, the difference between the distance from the center C of the clamping area to the corresponding point N of the extreme point N' on the ear hook 12 and the distance from the center C of the clamping area to the upper vertex K can be in the range of 2.8mm-5mm.

[0116] The earhook clamping point E may be the point on the earhook 12 that is closest to the center C of the clamping area, and can be used to measure the clamping condition of the earhook 12 on the ear 100 when worn. By setting the position of the earhook clamping point E, the clamping force of the earhook 12 on the ear 100 can be changed. In some embodiments, when the sound-emitting part 11 is set to a regular shape such as a circle, an ellipse, a rounded square, a rounded rectangle, etc., the intersection of the long axis of the sound-emitting part and the first part of the earhook can be defined as the earhook clamping point E. The earhook clamping point E can be determined in the following way: the point on the first part of the earhook corresponding to the intersection of the orthographic projection of the first part of the earhook on a reference plane perpendicular to the long axis direction Y (such as the XZ plane in Figure 11) and the orthographic projection of the central axis of the sound-emitting part 11 on the same reference plane is defined as the earhook clamping point E. In some embodiments, when the long axis of the sound-emitting portion 11 is difficult to determine (for example, the sound-emitting portion 11 is configured to be an irregular shape), as shown in FIG11 , the earhook clamping point E can be defined as the intersection of a section passing through the center C of the clamping region and perpendicular to a section through the free end FE and the end of the earhook 12 away from the sound-emitting portion 11 (for example, the battery compartment), and a portion of the earhook 12 near the free end FE. The earhook clamping point E can be determined by determining a straight line S on a reference plane perpendicular to the thickness direction X (for example, the YZ plane in FIG11 ) passing through the orthographic projection of the clamping region center C on the reference plane and perpendicular to the tangent line T, and determining the intersection of the straight line S and the portion of the orthographic projection of the earhook 12 on the reference plane near the orthographic projection of the free end FE on the reference plane. The earhook clamping point E can be defined as the point on the earhook 12 on the reference plane where the above-mentioned intersection is formed.

[0117] In some embodiments, when the earhook is worn, the distance between the projection point E' of the earhook clamping point E on the user's sagittal plane and the extreme point N', or the distance between the projection point E' of the earhook clamping point E on the user's sagittal plane and the projection point K' of the upper vertex K on the user's sagittal plane, needs to be maintained within a certain range. If the aforementioned distance is too large, the corresponding point N on the earhook 12 between the earhook clamping point E and the extreme point N', or the earhook 12 between the earhook clamping point E and the upper vertex K, will be difficult to clamp to the back side of the cavum concha 102 (for example, the clamping position is lower than the cavum concha 102), and the end of the earhook 12 away from the sound-emitting portion 11 (for example, the battery compartment) will not fit well with the ear 100. If the aforementioned distance is too small, it will also cause the ear hook clamping point E and the corresponding point N of the extreme point N' on the ear hook 12, or the ear hook 12 between the ear hook clamping point E and the upper vertex K to be difficult to clamp on the back side of the concha 102 (for example, the clamping position is slightly above the concha 102), and the end of the ear hook 12 away from the sound-emitting part 11 will squeeze the ear 100, resulting in poor comfort.

[0118] In some embodiments, in order to meet wearing requirements, in the wearing state, the distance between the projection point E' of the ear hook clamping point E on the user's sagittal plane and the extreme point N' can be in the range of 25mm-45mm. In some embodiments, in order to make the end of the ear hook 12 away from the sound-emitting part 11 fit better with the ear 100, in the wearing state, the distance between the projection point E' of the ear hook clamping point E on the user's sagittal plane and the extreme point N' can be in the range of 26mm-40mm. In some embodiments, in order to make it more comfortable, in the wearing state, the distance between the projection point E' of the ear hook clamping point E on the user's sagittal plane and the extreme point N' can be in the range of 27mm-36mm.

[0119] In some embodiments, in order to meet wearing requirements, in the wearing state, the distance between the projection point E' of the ear hook clamping point E on the user's sagittal plane and the projection point K' of the upper vertex K on the user's sagittal plane can be 28mm-48mm. In some embodiments, in order to make the end of the ear hook 12 away from the sound-emitting part 11 fit better with the ear 100, in the wearing state, the distance between the projection point E' of the ear hook clamping point E on the user's sagittal plane and the projection point K' of the upper vertex K on the user's sagittal plane can be 30mm-42mm. In some embodiments, in order to make it more comfortable, in the wearing state, the distance between the projection point E' of the ear hook clamping point E on the user's sagittal plane and the projection point K' of the upper vertex K on the user's sagittal plane can be 35mm-40mm.

[0120] In some embodiments, when not wearing the earhook, the distance between the earhook clamping point E and the corresponding point N on the earhook of the extreme point N', or the distance between the earhook clamping point E and the upper vertex K, needs to be maintained within a certain range. If the aforementioned distance is too small, when wearing the earhook, the earhook 12 between the earhook clamping point E and the corresponding point N on the earhook of the extreme point N', or between the earhook clamping point E and the upper vertex K, will be difficult to clamp to the back side of the cavum concha 102 (for example, the clamping position will be slightly above the cavum concha 102), and the end of the earhook 12 away from the sound-emitting portion 11 will squeeze the ear 100, resulting in poor comfort. If the aforementioned distance is too large, the earhook 12 between the earhook clamping point E and the corresponding point N of the extreme point N' on the earhook, or between the earhook clamping point E and the upper vertex K, will bend too much or be difficult to clamp on the back side of the concha 102 (for example, the clamping position is lower than the concha 102) when worn, and the end of the earhook 12 away from the sound-emitting part 11 (for example, the battery compartment) will not fit well with the ear 100.

[0121] In some embodiments, in order to meet wearing requirements, in the non-wearing state, the distance between the earhook clamping point E and the corresponding point N of the extreme point N' on the earhook can range from 25mm to 45mm. In some embodiments, in order to make the end of the earhook 12 away from the sound-emitting part 11 fit better with the ear 100, in the non-wearing state, the distance between the earhook clamping point E and the corresponding point N of the extreme point N' on the earhook can range from 30mm to 43mm. In some embodiments, in order to make it more comfortable, in the non-wearing state, the distance between the earhook clamping point E and the corresponding point N of the extreme point N' on the earhook and the extreme point N' can range from 32mm to 38mm.

[0122] In some embodiments, to meet wearing requirements, when not wearing the headset, the distance between the earhook clamping point E and the upper vertex K can range from 25mm to 45mm. In some embodiments, to ensure a better fit between the end of the earhook 12 away from the sound-emitting portion 11 and the ear 100, when not wearing the headset, the distance between the earhook clamping point E and the upper vertex K can range from 29mm to 43mm. In some embodiments, to provide greater comfort, when not wearing the headset, the distance between the earhook clamping point E and the upper vertex K can range from 32mm to 37mm.

[0123] In some embodiments, after the shape and size of the generating portion 11 are determined, in the wearing state, the difference between the distance from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the extreme point N' and the distance from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane can reflect the positional relationship between the extreme point N' and the projection point K' of the ear hook upper vertex K on the user's sagittal plane (for example, the distance between the extreme point N' and the projection point K' of the ear hook upper vertex K on the user's sagittal plane). Since the ear hook upper vertex K is the highest point of the ear hook inner contour along the user's vertical axis in the wearing state, the positional relationship between the extreme point N' and the projection point K' of the ear hook upper vertex K on the user's sagittal plane can reflect the positional relationship of the extreme point N' relative to the user's ear when the user wears the headphones. In the non-wearing state, the difference between the distance from the earhook clamping point E to the corresponding point N of the extreme point N' on the earhook and the distance from the earhook clamping point E to the upper vertex K can also reflect the positional relationship between the corresponding point N of the extreme point N' on the earhook 12 and the upper vertex K of the earhook (for example, the distance between the corresponding point N of the extreme point N' on the earhook 12 and the upper vertex K of the earhook). The positional relationship between the corresponding point N of the extreme point N' on the earhook 12 and the upper vertex K of the earhook can also reflect the positional relationship between the corresponding point N of the extreme point N' on the earhook 12 relative to the user's ear when the user wears the earphones. The greater the aforementioned difference (i.e., in the wearing state, the difference between the distance from the projection point E' of the earhook clamping point E on the user's sagittal plane to the extreme point N' and the distance from the projection point E' of the earhook clamping point E on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane, or, in the non-wearing state, the difference between the distance from the earhook clamping point E to the corresponding point N of the extreme point N' on the earhook and the distance from the earhook clamping point E to the upper vertex K) is, the greater the distance between the extreme point N' and the projection point K' of the earhook upper vertex K on the user's sagittal plane, or the extreme point The greater the distance between the corresponding point N of N' on the earhook 12 and the vertex K on the earhook, the lower the position of the extreme point N' relative to the ear when the user wears the earphones, the smaller the force arm of the "clamping force lever" and the greater the clamping force; the smaller the aforementioned difference, the smaller the distance between the extreme point N' and the projection point K' of the vertex K on the user's sagittal plane, or the smaller the distance between the corresponding point N of the extreme point N' on the earhook 12 and the vertex K on the earhook, the higher the position of the extreme point N' relative to the ear when the user wears the earphones, the larger the force arm of the "clamping force lever" and the smaller the clamping force.

[0124] In some embodiments, when the earhook is worn, the difference between the distance from the projection point E' of the earhook clamping point E on the user's sagittal plane to the extreme point N' and the distance from the projection point E' of the earhook clamping point E on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane, or when the earhook is not worn, the difference between the distance from the earhook clamping point E to the corresponding point N of the extreme point N' on the earhook and the distance from the earhook clamping point E to the upper vertex K needs to be maintained within a certain range. If the aforementioned difference is too small, the clamping force will be too small when the earhook is worn, and the earhook 12 and the sound-emitting portion 11 will not be able to effectively clamp the front and back sides of the ear 100, resulting in poor wearing stability. Moreover, when the sound-emitting portion 11 cannot effectively clamp the cavum concha 102, the gap between the sound-emitting portion 11 and the cavum concha 102 will be too large, that is, the cavity-like opening formed will be too large, resulting in a reduced listening index. If the aforementioned difference is too large, the clamping force will be too strong when the earphone 10 is worn, causing a strong sense of pressure on the user's ear 100 while being worn, making it difficult to adjust the wearing position after wearing. Furthermore, a large difference will cause the sound-producing portion 11 to exert excessive pressure on the cavum concha 102, increasing the tendency of the sound-producing portion 11 to rotate about the clamping fulcrum. The clamping area of ​​the sound-producing portion 11 may slide toward the location of the clamping fulcrum, causing the sound-producing portion 11 to lose its intended position in the cavum concha 102. In this case, the sidewalls of the sound-producing portion 11 may abut against the upper edge of the cavum concha 102, resulting in a small or insufficient gap between the sidewalls of the sound-producing portion 11 and the cavum concha 102, resulting in poor sound leakage reduction.

[0125] In some embodiments, in order to meet wearing requirements, the difference between the distance from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the extreme point N' and the distance from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane can be in the range of 1mm-5mm. In some embodiments, in order to increase the adjustability after wearing and further improve the sound leakage reduction effect, the difference between the distance from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the extreme point N' and the distance from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane can be in the range of 1.5mm-4mm. In some embodiments, in order to increase the stability after wearing and make the earphones have a better listening index when worn, the difference between the distance from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the extreme point N' and the distance from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the projection point K' of the upper vertex K on the user's sagittal plane can be in the range of 2.5mm-3.5mm.

[0126] In some embodiments, in order to meet the wearing requirements, in the non-wearing state, the difference between the distance from the earhook clamping point E to the corresponding point N of the extreme point N' on the earhook and the distance from the earhook clamping point E to the upper vertex K can be in the range of 0.01mm-0.1mm. In some embodiments, in order to increase the adjustability after wearing and further improve the sound leakage reduction effect, in the non-wearing state, the difference between the distance from the earhook clamping point E to the corresponding point N of the extreme point N' on the earhook and the distance from the earhook clamping point E to the upper vertex K can be in the range of 0.01mm-0.06mm. In some embodiments, in order to increase the stability after wearing and make the earphones have a better listening index in the wearing state, in the non-wearing state, the difference between the distance from the earhook clamping point E to the corresponding point N of the extreme point N' on the earhook and the distance from the earhook clamping point E to the upper vertex K can be in the range of 0.02mm-0.05mm.

[0127] In some embodiments, in the non-wearing state, the minimum distance between the sound-emitting part 11 and the first part of the earhook needs to be maintained within a certain range. It should be noted that the minimum distance between the sound-emitting part 11 and the first part of the earhook mentioned here refers to the minimum distance between the area on the sound-emitting part 11 clamped on both sides of the user's auricle (i.e. the clamping area) and the area on the first part of the earhook (i.e. the area near the earhook clamping point E). In some embodiments, for the convenience of description, the minimum distance between the sound-emitting part 11 and the first part of the earhook can be understood as the distance between the center C of the clamping area and the earhook clamping point E. If the aforementioned minimum distance is too large, it will result in the inability to effectively clamp on both sides of the ear 100 after wearing (i.e. the wearing stability deteriorates), and it will cause the gap between the sound-emitting part 11 and the cavum concha 102 to be too large, that is, the cavity-like opening formed is too large, which will lead to a smaller listening index.

[0128] In some embodiments, to improve the listening experience when the earphones are worn, the distance between the center of the clamping area C and the earhook clamping point E may be no greater than 3 mm when not worn. In some embodiments, to increase stability when worn, the distance between the center of the clamping area C and the earhook clamping point E may be no greater than 2.6 mm when not worn. In some embodiments, to ensure that the cavity-like structure formed by the sound-emitting portion 11 and the cavum concha 102 has a more appropriate opening size, the distance between the center of the clamping area C and the earhook clamping point E may be no greater than 2.2 mm when not worn.

[0129] In some embodiments, when the earphones are worn, the minimum distance between the sound-emitting portion 11 and the first portion of the earhook must be maintained within a certain range. Specifically, the distance between the projection point C' of the clamping area center C on the user's sagittal plane and the projection point E' of the earhook clamping point E on the user's sagittal plane must be maintained within a certain range. If this minimum distance is too small, the earphones 10 may exert a strong pressure on the user's ears 100 while worn, making it difficult to adjust the wearing position after wearing. Furthermore, the sidewalls of the sound-emitting portion 11 may abut against the upper edge of the cavum concha 102, leaving too few or too small gaps between the sidewalls of the sound-emitting portion 11 and the cavum concha 102, resulting in poor sound leakage reduction.

[0130] In some embodiments, in order to meet wearing requirements, in the wearing state, the distance between the projection point C' of the clamping area center C on the user's sagittal plane and the projection point E' of the ear hook clamping point E on the user's sagittal plane may be no less than 2 mm. In some embodiments, in order to improve the sound leakage reduction effect, in the wearing state, the distance between the projection point C' of the clamping area center C on the user's sagittal plane and the projection point E' of the ear hook clamping point E on the user's sagittal plane may be no less than 2.5 mm. In some embodiments, in order to further increase the adjustability after wearing, in the wearing state, the distance between the projection point C' of the clamping area center C on the user's sagittal plane and the projection point E' of the ear hook clamping point E on the user's sagittal plane may be no less than 2.8 mm.

[0131] In some embodiments, the earphone 10 may include a wearing state and a non-wearing state, and the difference between the minimum distance between the sound-emitting portion 11 and the first part of the ear hook in the wearing state and the non-wearing state needs to be kept within a certain range, that is, in the non-wearing state, the distance between the center C of the clamping area and the ear hook clamping point E, and the distance between the projection point C' of the clamping area center C on the user's sagittal plane and the projection point E' of the ear hook clamping point E on the user's sagittal plane in the wearing state need to be kept within a certain range. It should be noted that the difference between the wearing state and the non-wearing state can correspond to the distance. If the aforementioned difference is too small, according to formula (1), the clamping force will be too small, resulting in the inability to effectively clamp on both sides of the ear 100 after wearing, and the gap between the sound-emitting portion 11 and the concha cavity 102 will be too large, that is, the cavity-like opening formed will be too large, which will lead to a smaller listening index.

[0132] In some embodiments, in order to provide a better listening index when the earphones are worn, the difference between the minimum distance between the sound-emitting portion 11 and the first part of the earhook when worn and when not worn can be no less than 1 mm. In some embodiments, in order to increase stability after wearing, the difference between the minimum distance between the sound-emitting portion 11 and the first part of the earhook when worn and when not worn can be no less than 1.3 mm. In some embodiments, in order to provide a more appropriate opening size for the cavity-like structure formed by the sound-emitting portion 11 and the cavum concha 102, the difference between the minimum distance between the sound-emitting portion 11 and the first part of the earhook when worn and when not worn can be no less than 1.5 mm.

[0133] In some embodiments, after the clamping coefficient is determined, when not worn, the angle between a first line connecting the center C of the clamping region to the corresponding point N of the extreme point N' on the earhook 12 and a second line connecting the earhook clamping point E to the corresponding point N of the extreme point N' on the earhook 12 needs to be maintained within a certain range, so that the earphone can provide appropriate clamping force to the ear 100 when worn, and the sound-producing portion 11 is positioned as expected in the cavum concha 102. When the clamping coefficient and the shape and size of the sound-producing portion 11 are consistent, if the aforementioned angle is too large, the earphone will not be effectively clamped on both sides of the ear 100 when worn, and the gap between the sound-producing portion 11 and the cavum concha 102 will be too large, that is, the cavity-like opening formed will be too large, which will in turn lead to a lower listening index. When the clamping coefficient and the shape and size of the sound-emitting part 11 are consistent, if the aforementioned angle is too small, the difference between the angle of the connecting line in the wearing state and the angle of the connecting line in the non-wearing state will be too large, so that the clamping force of the ear hook 12 on the ear 100 in the wearing state will be too large, resulting in the earphone 10 exerting a strong pressure on the user's ear 100 in the wearing state, making it difficult to adjust the wearing position after wearing, and causing the side wall of the sound-emitting part 11 to fit against the upper edge of the cavum concha 102. The gap between the side wall of the sound-emitting part 11 and the cavum concha 102 is too small or too few, resulting in poor sound leakage reduction effect.

[0134] In some embodiments, in order to meet wearing requirements, in the non-wearing state, the angle between the first line connecting the clamping area center C to the corresponding point N of the extreme point N' on the ear hook 12 and the second line connecting the ear hook clamping point E to the corresponding point N of the extreme point N' on the ear hook 12 can be in the range of 3°-9°. In some embodiments, in order to increase adjustability after wearing, in the non-wearing state, the angle between the first line connecting the clamping area center C to the corresponding point N of the extreme point N' on the ear hook 12 and the second line connecting the ear hook clamping point E to the corresponding point N of the extreme point N' on the ear hook 12 can be in the range of 3.1°-8.4°. In some embodiments, in order to increase stability after wearing, in the non-wearing state, the angle between the first line connecting the clamping area center C to the corresponding point N of the extreme point N' on the ear hook 12 and the second line connecting the ear hook clamping point E to the corresponding point N of the extreme point N' on the ear hook 12 can be in the range of 3.8°-8°. In some embodiments, to provide a better listening index when the earphones are being worn, in the non-wearing state, the angle between a first line connecting the center C of the clamping area to the corresponding point N of the extreme point N' on the earhook 12 and a second line connecting the earhook clamping point E to the corresponding point N of the extreme point N' on the earhook 12 can be in the range of 4.5°-7.9°. In some embodiments, to further improve the sound leakage reduction effect, in the non-wearing state, the angle between a first line connecting the center C of the clamping area to the corresponding point N of the extreme point N' on the earhook 12 and a second line connecting the earhook clamping point E to the corresponding point N of the extreme point N' on the earhook 12 can be in the range of 4.6°-7°.

[0135] In some embodiments, when the clamping coefficient and the shape and size of the earphone 10 are consistent, when worn, the angle between a first line connecting the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and a second line connecting the projection point E' of the earhook clamping point E on the user's sagittal plane to the extreme point N' needs to be maintained within a certain range to provide appropriate clamping force to the ear 100 and position the sound-producing portion 11 in the desired position within the cavum concha 102. When the clamping coefficient and the shape and size of the earphone 10 are consistent, if the aforementioned angle is too small, the earphone 10 may cause a strong sense of pressure on the user's ear 100 when worn, making it difficult to adjust the wearing position after wearing. Furthermore, the sidewalls of the sound-producing portion 11 may abut against the upper edge of the cavum concha 102, leaving too small or too few gaps between the sidewalls of the sound-producing portion 11 and the cavum concha 102, resulting in poor sound leakage reduction. When the clamping coefficient and the shape and size of the earphone 10 are consistent, if the aforementioned angle is too large, it will result in the inability to effectively clamp on both sides of the ear 100 after wearing, and will cause the gap between the sound-producing part 11 and the concha cavity 102 to be too large, that is, the cavity-like opening formed is too large, which will lead to a smaller listening index.

[0136] In some embodiments, in order to meet wearing requirements, in the wearing state, the angle between the first line from the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the second line from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the extreme point N' can be in the range of 6°-12°. In some embodiments, in order to increase adjustability after wearing, in the wearing state, the angle between the first line from the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the second line from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the extreme point N' can be in the range of 6.3°-10.8°. In some embodiments, in order to increase stability after wearing, in the wearing state, the angle between the first line from the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the second line from the projection point E' of the ear hook clamping point E on the user's sagittal plane to the extreme point N' can be in the range of 7°-10.5°. In some embodiments, in order to make the earphones have a better listening index when worn, in the worn state, the angle between the first line connecting the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the second line connecting the projection point E' of the ear hook clamping point E on the user's sagittal plane to the extreme point N' can be in the range of 7.3°-10°. In some embodiments, in order to further improve the sound leakage reduction effect, in the worn state, the angle between the first line connecting the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the second line connecting the projection point E' of the ear hook clamping point E on the user's sagittal plane to the extreme point N' can be in the range of 8°-9.8°.

[0137] In some embodiments, the earphone 10 can include a worn state and a non-worn state, and the difference between the angle between the lines connected in the worn state and the angle between the lines connected in the non-worn state needs to be maintained within a certain range. It should be noted that the angle between the first line connecting the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the second line connecting the projection point E' of the earhook clamping point E on the user's sagittal plane to the extreme point N' in the worn state; the angle between the first line connecting the projection point C' of the clamping area center C on the user's sagittal plane to the extreme point N' and the second line connecting the projection point E' of the earhook clamping point E on the user's sagittal plane to the extreme point N' in the non-worn state. When the clamping coefficients are consistent, if the aforementioned difference is too small, the clamping force will be too weak, resulting in an ineffective clamping force on both sides of the ear 100 after wearing. Furthermore, the gap between the sound-producing part 11 and the cavum concha 102 will be too large, i.e., the cavity-like opening formed will be too large, which will lead to a lower listening index. When the clamping coefficients are consistent, if the aforementioned difference is too large, the clamping force will be too large, which will cause the earphone 10 to exert strong pressure on the user's ear 100 when worn, making it difficult to adjust the wearing position after wearing. It will also cause the side wall of the sound-emitting part 11 to fit the upper edge of the concha 102, and the gap between the side wall of the sound-emitting part 11 and the concha 102 will be too small or too few, resulting in poor sound leakage reduction effect.

[0138] In some embodiments, in order to meet wearing requirements, the difference between the angle between the line in the wearing state and the angle between the line in the non-wearing state can be in the range of 2°-4°. In some embodiments, in order to increase adjustability after wearing, the difference between the angle between the line in the wearing state and the angle between the line in the non-wearing state can be in the range of 2.1°-3.8°. In some embodiments, in order to increase stability after wearing, the difference between the angle between the line in the wearing state and the angle between the line in the non-wearing state can be in the range of 2.3°-3.7°. In some embodiments, in order to make the earphones have a better listening index when worn, the difference between the angle between the line in the wearing state and the angle between the line in the non-wearing state can be in the range of 2.5°-3.6°. In some embodiments, in order to further improve the sound leakage reduction effect, the difference between the angle between the line in the wearing state and the angle between the line in the non-wearing state can be in the range of 2.6°-3.4°.

[0139] Figures 12A and 12B are schematic diagrams of exemplary position structures of the center of mass of the earphone according to some embodiments of this specification. As shown in Figures 12A and 12B, in some embodiments, the center of mass of the earphone 10 is point F. In some embodiments, due to the internal structure of the sound-emitting part 11 (such as the magnetic circuit, circuit board, etc.), the mass of the sound-emitting part 11 in the earphone 10 is relatively large. Therefore, the position of the center of mass F of the earphone 10 is close to the position H of the center of mass of the sound-emitting part 11, or is greatly affected by the mass of the sound-emitting part 11, that is, the position of the center of mass F of the earphone 10 can represent the position of the sound-emitting part 11 to a certain extent. For ease of explanation, the specific position of the center of mass F of the earphone 10 is described in detail below through the relative positions of the center of mass F of the earphone 10 and the sound-emitting part 11.

[0140] Referring to Figure 12A , in some embodiments, the distance between the center of mass F of the earphone 10 and the lower side surface LS of the sound-emitting portion 11 on the YZ plane can be 2 mm to 6 mm. In some embodiments, the distance between the center of mass F of the earphone 10 and the lower side surface LS of the sound-emitting portion 11 on the YZ plane can be 3 mm to 5 mm. In some embodiments, the distance between the center of mass F of the earphone 10 and the lower side surface LS of the sound-emitting portion 11 on the YZ plane can be 4 mm to 4.5 mm.

[0141] In some embodiments, the distance between the center of mass F of the earphone 10 and the long axis (i.e., the x-axis) of the sound-emitting portion 11 on the YZ plane can be 1 mm to 3 mm. In some embodiments, the distance between the center of mass F of the earphone 10 and the long axis (i.e., the x-axis) of the sound-emitting portion 11 on the YZ plane can be 1.5 mm to 2.8 mm. In some embodiments, the distance between the center of mass F of the earphone 10 and the long axis (i.e., the x-axis) of the sound-emitting portion 11 on the YZ plane can be 2 mm to 2.5 mm.

[0142] In some embodiments, the distance between the center of mass F of the earphone 10 and the free end FE (i.e., the rear side RS) of the sound-emitting portion 11 on the YZ plane can be 4 mm to 8 mm. In some embodiments, the distance between the center of mass F of the earphone 10 and the free end FE (i.e., the rear side RS) of the sound-emitting portion 11 on the YZ plane can be 5 mm to 7 mm. In some embodiments, the distance between the center of mass F of the earphone 10 and the free end FE (i.e., the rear side RS) of the sound-emitting portion 11 on the YZ plane can be 6 mm to 6.8 mm.

[0143] Referring to Figure 12B , in some embodiments, the distance between the center of mass F of the earphone 10 and the inner side surface IS of the sound-emitting portion 11 on the XY plane can be 2 mm to 6 mm. In some embodiments, the distance between the center of mass F of the earphone 10 and the inner side surface IS of the sound-emitting portion 11 on the YZ plane can be 3 mm to 5 mm. In some embodiments, the distance between the center of mass F of the earphone 10 and the inner side surface IS of the sound-emitting portion 11 on the YZ plane can be 4.5 mm to 4.8 mm.

[0144] In some embodiments, the design of the center of mass F, upper vertex K, and earhook extreme point N of the earphone 10 can improve the wearing stability and adjustability of the earphone 10. In some embodiments, since the ear portion 100 primarily supports the earphone 10 via the upper vertex K of the earhook 12, when the user wears the earphone 10, it can be considered to form a "support lever" with the upper vertex K as the support point. When worn, the center of mass F of the earphone 10 is located behind the upper vertex K (i.e., closer to the back of the user's head). This prevents the earphone 10 from tipping forward (i.e., away from the back of the user's head) while worn, thereby improving the wearing stability of the earphone 10. In some embodiments, the earhook extreme point N can be the location of the smallest cross-section on the earhook 12, making it easier for the earhook 12 to deform at the earhook extreme point N. As a result, when the user wears the earphone 10, the first portion 121 of the earhook 12 and the sound-emitting portion 11 form a "clamping lever" structure with the earhook extreme point N as the fulcrum, clamping the ear on both sides of the user's ear (e.g., the front and back sides of the cavum concha 102). To improve the stability of the "support lever" and "clamping force lever," the center of mass F and upper vertex K of the earphone 10 are located on either side of the earhook extreme point N. The positions of the center of mass F, upper vertex K, and earhook extreme point N are described in further detail below.

[0145] Because the position of the earphone 10's center of mass F is significantly affected by the position of the sound-emitting portion 11, when the overall volume of the earhook 12 remains relatively unchanged, the position between the upper vertex K and the earphone 10's center of mass F reflects, to a certain extent, the relative position of the sound-emitting portion 11 within the ear when the earphone 10 is worn. Specifically, when the distance between the earphone 10's center of mass F and the upper vertex K of the earhook 12 is too large, the sound-emitting portion 11 may be positioned closer to the user's ear canal opening when the user wears the earphone 10, causing the sound-emitting portion 11 to be positioned lower within the cavum concha, and the gap between the upper side US of the sound-emitting portion 11 and the cavum concha to be too large, resulting in a weaker listening experience. When the distance between the center of mass position F of the earphone 10 and the upper vertex K of the ear hook 12 is too small, the upper side surface US of the sound-emitting part 11 fits into the upper edge of the cavum concha, and the gap between the upper side surface US and the cavum concha is too small or too few, resulting in poor sound leakage reduction effect, and the sound outlet on the sound-emitting part 11 is too far away from the external auditory canal, which has an adverse effect on the listening effect.

[0146] As shown in FIG6 , in some embodiments, in order to obtain a better listening effect, the distance between the projection point K' of the upper vertex K and the projection point F' of the center of mass F of the earphone 10 on the projection of the earphone 10 on the user's sagittal plane may be 22 mm to 35 mm. In some embodiments, in order to further improve the sound leakage reduction effect, the distance between the projection point K' of the upper vertex K and the projection point F' of the center of mass F of the earphone 10 on the projection of the earphone 10 on the user's sagittal plane may be 25 mm to 30 mm. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the cavum concha have a more appropriate volume and opening size / number, the distance between the projection point K' of the upper vertex K and the projection point F' of the center of mass F of the earphone 10 on the projection of the earphone 10 on the user's sagittal plane may be 27 mm to 29 mm.

[0147] In some embodiments, to achieve a better listening experience, the distance between the upper vertex K and the center of mass F of the earphone 10 on the earphone 10 can be 20mm-38mm. In some embodiments, to further improve the effect of reducing sound leakage, the distance between the upper vertex K and the center of mass F of the earphone 10 on the earphone 10 can be 25mm-32.5mm. In some embodiments, to ensure that the cavity-like structure formed by the sound-emitting portion 11 and the cavum concha has a more appropriate volume and opening size / number, the distance between the upper vertex K and the center of mass F of the earphone 10 on the earphone 10 can be 27mm-30mm.

[0148] In some embodiments, the angle α1 formed between the line connecting the center of mass F of the earphone 10 and the upper vertex K of the earhook 12, and the longitudinal axis Y of the sound-emitting portion 11, can affect the stability of the earphone 10 when worn. If the angle α1 formed between the line connecting the center of mass F of the earphone 10 and the upper vertex K of the earhook 12, and the longitudinal axis Y of the sound-emitting portion 11, is too large, the free end FE of the sound-emitting portion 11 can be too far from the sidewall of the user's cavum concha, resulting in a weaker grip of the sound-emitting portion 11 on the cavum concha and unstable wearing. If the angle α1 formed between the line connecting the center of mass F of the earphone 10 and the upper vertex K of the earhook 12, and the longitudinal axis Y of the sound-emitting portion 11, is too small, the free end FE of the sound-emitting portion 11 can fit too tightly against the user's cavum concha, affecting the wearing comfort of the earphone 10 and reducing the adjustability of the earphone 10.

[0149] In some embodiments, in order to make the earphone 10 have higher wearing stability and adjustability, on the projection of the earphone 10 on the user's sagittal plane, the angle α1 between the line K'F' connecting the projection point K' of the upper vertex K and the projection point F' of the center of mass F of the earphone 10 and the long axis Y (i.e., the x-axis) of the projection of the sound-emitting part 11 can be in the range of 35°-60°. It should be noted that the angle α1 between the line K'F' connecting the projection point K' of the upper vertex K and the projection point F' of the center of mass F of the earphone 10 and the long axis Y (i.e., the x-axis) of the projection of the sound-emitting part 11 refers to the angle between the line K'F' in the counterclockwise direction and the x-axis with the positive direction of the x-axis as the reference, as shown in FIG6 . In some embodiments, to further enhance the wearing stability of the earphone 10, the angle α1 between the line K'F' connecting the projection point K' of the upper vertex K and the projection point F' of the center of mass F of the earphone 10 and the long axis Y (i.e., the x-axis) of the projection of the sound-emitting portion 11 may be in the range of 40°-55°. In some embodiments, to further enhance the adjustability of the earphone 10, the angle α1 between the line K'F' connecting the projection point K' of the upper vertex K and the projection point F' of the center of mass F of the earphone 10 and the long axis Y (i.e., the x-axis) of the projection of the sound-emitting portion 11 may be in the range of 45°-50°.

[0150] In some embodiments, in addition to using the position of the projection point to reflect the angle α1 between the line connecting the center of mass F of the earphone 10 and the upper vertex K and the long axis Y of the sound-emitting portion 11, actual measurement can also be performed on the earhook 12. In some embodiments, to ensure that the earphone 10 has greater wearing stability and adjustability, the angle α1 between the line connecting the center of mass F of the earphone 10 and the upper vertex K of the earhook 12 and the long axis Y of the sound-emitting portion 11 can be 30°-55°. In some embodiments, to further improve the wearing stability of the earphone 10, the angle α1 between the line connecting the center of mass F of the earphone 10 and the upper vertex K of the earhook 12 and the long axis Y of the sound-emitting portion 11 can be 40°-50°. In some embodiments, to further improve the adjustability of the earphone 10, the angle α1 between the line connecting the center of mass F of the earphone 10 and the upper vertex K of the earhook 12 and the long axis Y of the sound-emitting portion 11 can be 45°-48°.

[0151] As shown in Figures 3 and 6, in some embodiments, the projection point of the center of mass F of the earphone 10 on the sagittal plane of the user is point F'. In some embodiments, when the distance between the center of mass F of the earphone 10 and the extreme point N of the earhook is too large, the clamping position of the earphone 10 on the ear may be too low, and the sound-emitting part 11 may not fit well with the cavum concha when worn, thereby affecting the cavity-like structure and causing unstable wearing. The cavity-like gap formed between the sound-emitting part 11 and the cavum concha is too large, thereby deteriorating the listening effect. When the distance between the center of mass F of the earphone 10 and the extreme point N of the earhook is too small, it means that the force arms at both ends of the fulcrum of the aforementioned "clamping force lever" may be too small. When the clamping force remains unchanged, the lever structure will be less stable, and the earphone 10 may be unstable when worn.

[0152] In some embodiments, in order to ensure that the earphone 10 has high wearing stability and good listening effect when worn, the distance between the extreme point N' and the projection point F' of the center of mass F of the earphone 10 on the projection of the earphone 10 on the sagittal plane of the user may be 20mm-35mm. In some embodiments, in order to further improve the wearing stability of the earphone 10, the distance between the extreme point N' and the projection point F' of the center of mass F of the earphone 10 on the projection of the earphone 10 on the sagittal plane of the user may be 25mm-30mm. In some embodiments, in order to further improve the listening effect, the distance between the extreme point N' and the projection point F' of the center of mass F of the earphone 10 on the projection of the earphone 10 on the sagittal plane of the user may be 27mm-28mm.

[0153] In some embodiments, to ensure that the earphone 10 has high wearing stability and good listening quality when worn, the distance between the center of mass F of the earphone 10 and the earhook extreme point N on the earphone 10 can be 18mm-40mm. In some embodiments, to further improve wearing stability, the distance between the center of mass F of the earphone 10 and the earhook extreme point N on the earphone 10 can be 24mm-31mm. In some embodiments, to further improve listening quality, the distance between the center of mass F of the earphone 10 and the earhook extreme point N can be 26mm-29mm.

[0154] In some embodiments, as shown in FIG6 , on the projection of the earphone 10 on the user's sagittal plane, a first angle α2 formed between the line N'F' connecting the extreme point N' and the projection point F' of the earphone's center of mass, and the longitudinal axis Y (i.e., the x-axis) of the projection of the sound-producing portion 11, can be less than 90°. This allows the projection point F' of the earphone's center of mass F to be located behind the extreme point N' on the longitudinal axis Y of the sound-producing portion 11. Because the center of mass F of the earphone 10 is primarily influenced by the mass of the sound-producing portion 11, the position of the center of mass F also reflects, to a certain extent, the position at which the sound-producing portion 11 grips the cavum concha. Specifically, the position at which the sound-producing portion 11 grips the cavum concha is closer to the back of the user's head than the earhook's extreme point N, further enhancing the stability of the aforementioned "clamping force lever." It should be noted that the first angle α2 between the line N'F' connecting the extreme point N' and the projection point F' of the center of mass of the earphone 10 and the long axis direction Y (i.e., the x-axis direction) of the projection of the sound-emitting part 11 refers to the angle between the line N'F' and the x-axis in the counterclockwise direction with the positive direction of the x-axis as the reference, as shown in Figure 6.

[0155] When the first angle α2 between the line connecting the center of mass F of the earphone 10 and the earhook extreme point N and the long axis Y of the sound-emitting portion 11 is too large, the sound-emitting portion 11 is clamped too low relative to the concha, and the gap between the upper side US and the concha is too large, resulting in a weak listening experience. When the first angle α2 between the line connecting the center of mass F of the earphone 10 and the earhook extreme point N and the long axis Y of the sound-emitting portion 11 is too small, the sound-emitting portion 11 is clamped too high relative to the concha, the upper side US fits closely to the upper edge of the concha, and the gap between the upper side US and the concha is too small or too few, resulting in poor sound leakage reduction. Due to the limited space in the user's concha, clamping the sound-emitting portion 11 too low or too high relative to the concha can easily make it difficult for the earphone 10 to be stably clamped to the user's ear due to the shape of the concha.

[0156] In some embodiments, to achieve a better listening experience, the first angle α2 between the line N'F' connecting the extreme point N' and the projection point F' of the center of mass F of the earphone 10 and the long axis Y (i.e., the x-axis) of the projection of the sound-emitting portion 11 can be in the range of 60°-80°. In some embodiments, to further improve the sound leakage reduction effect, the first angle α2 between the line N'F' connecting the extreme point N' and the projection point F' of the center of mass F of the earphone 10 and the long axis Y (i.e., the x-axis) of the projection of the sound-emitting portion 11 can be in the range of 60°-75°. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the cavum concha have a more suitable volume and opening size / number, and to make the clamping position of the sound-emitting part 11 located at a better position in the cavum concha, the first angle α2 between the line N'F' between the extreme point N' and the projection point F' of the center of mass F of the earphone 10 and the long axis direction Y (i.e., the x-axis direction) of the projection of the sound-emitting part 11 can be in the range of 65°-70°.

[0157] In some embodiments, in addition to reflecting the first angle α2 between the line connecting the center of mass F of the earphone 10 and the extreme point N of the earhook and the long axis Y of the sound-emitting portion 11 through the position of the above-mentioned projection point, actual measurement can also be performed on the earhook 12. In some embodiments, to achieve a better listening experience, on the earphone 10, the first angle α2 between the line connecting the center of mass F of the earphone 10 and the extreme point N of the earhook and the long axis Y of the sound-emitting portion 11 can be in the range of 50°-90°. In some embodiments, to further improve the sound leakage reduction effect, on the earphone 10, the first angle α2 between the line connecting the center of mass F of the earphone 10 and the extreme point N of the earhook and the long axis Y of the sound-emitting portion 11 can be in the range of 55°-85°. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the cavum concha have a more suitable volume and opening size / number, and to make the clamping position of the sound-emitting part 11 located at a better position in the cavum concha, on the earphone 10, the first angle α2 between the line connecting the center of mass F of the earphone 10 and the extreme point N of the earhook and the long axis direction Y of the sound-emitting part 11 can be in the range of 60°-75°.

[0158] In some embodiments, in addition to setting the position of the center of mass F of the earphone 10, the position of the center of mass H of the sound-emitting portion 11 can also be directly set to improve the wearing stability and listening effect of the earphone 10. As shown in Figures 3 and 5, in some embodiments, the projection point of the center of mass H of the sound-emitting portion 11 on the user's sagittal plane can coincide with the centroid of the projection of the sound-emitting portion 11 on the user's sagittal plane. In some embodiments, on the earphone 10, by changing the distance between the center of mass H of the sound-emitting portion 11 and the extreme point N of the earhook, the covering position of the sound-emitting portion 11 in the cavum concha when worn and the clamping position of the sound-emitting portion 11 clamping the cavum concha can be changed simultaneously, which can not only affect the stability and comfort of the user wearing the earphone 10, but also affect the listening effect of the earphone 10.

[0159] When the shape and size of the sound-producing portion 11 are consistent, if the distance between the center of mass H of the sound-producing portion 11 and the earhook extreme point N is too large, the sound-producing portion 11 will be positioned lower within the cavum concha, and the gap between the upper side US of the sound-producing portion 11 and the cavum concha will be too large, resulting in a poor listening experience. Furthermore, if the distance between the center of mass H of the sound-producing portion 11 and the earhook extreme point N is too large, excessive interference will occur between the sound-producing portion 11 (or the connection area between the earhook 12 and the sound-producing portion 11) and the tragus, causing the sound-producing portion 11 to excessively press against the tragus, affecting wearing comfort.

[0160] When the shape and size of the sound-producing portion 11 are consistent, if the distance between the center of mass H of the sound-producing portion 11 and the extreme point N of the ear hook is too small, the upper side US of the sound-producing portion 11 will fit closely with the upper edge of the cavum concha. The gaps between the upper side US and the cavum concha will be too small or too few, and the interior will be completely sealed from the external environment, making it impossible to form a cavity-like structure. Moreover, if the distance between the center of mass H of the sound-producing portion 11 and the extreme point N of the ear hook is too small, the sound-producing portion 11 (or the connection area between the ear hook 12 and the sound-producing portion) will excessively squeeze the outer contour of the ear, which will also affect wearing comfort.

[0161] In some embodiments, the projection point of the center of mass H of the sound-emitting portion 11 onto the user's sagittal plane and the centroid of the projection of the sound-emitting portion 11 onto the user's sagittal plane are both point H', and point H' is located on the long axis of the projection of the sound-emitting portion 11, i.e., point H' is located on the x-axis. In some embodiments, to provide a better listening experience when the earphone 10 is worn, the distance between the extreme point N' and the projection point H' of the center of mass H of the sound-emitting portion 11 onto the user's sagittal plane can be 20 mm to 30 mm. In some embodiments, to further improve sound leakage reduction, the distance between the extreme point N' and the projection point H' of the center of mass H of the sound-emitting portion 11 onto the user's sagittal plane can be 22 mm to 26 mm. In some embodiments, to ensure that the cavity-like structure formed by the sound-emitting portion 11 and the cavum concha has a more appropriate volume and opening size / number, and to ensure that the clamping position of the sound-emitting portion 11 is located at a more optimal position within the cavum concha, the distance between the extreme point N' and the projection point H' of the center of mass H of the sound-emitting portion 11 onto the user's sagittal plane can be 23 mm to 25 mm.

[0162] In some embodiments, in addition to reflecting the distance between the center of mass H of the sound-emitting part 11 and the earhook extreme point N by the distance of the above-mentioned projection points, actual measurement can also be performed on the earhook 12. In some embodiments, on the earphone 10, in order to make the earphone 10 have a better listening effect when wearing, the distance between the center of mass H of the sound-emitting part 11 and the earhook extreme point N can be 20mm-30mm. In some embodiments, in order to further improve the sound leakage reduction effect, on the earphone 10, the distance between the center of mass H of the sound-emitting part 11 and the earhook extreme point N can be 24mm-26mm. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the cavum concha have a more suitable volume and opening size / number, and to make the clamping position of the sound-emitting part 11 at a better position in the cavum concha, on the earphone 10, the distance between the center of mass H of the sound-emitting part 11 and the earhook extreme point N can be 24mm-26mm.

[0163] In some embodiments, the angle α3 between the line connecting the center of mass H of the sound-emitting portion 11 and the earhook extreme point N, and the long axis Y of the sound-emitting portion 11, can affect the position at which the sound-emitting portion 11 extends into the cavum concha. When the angle α3 between the line connecting the center of mass H of the sound-emitting portion 11 and the earhook extreme point N, and the long axis Y of the sound-emitting portion 11, is too large, the position of the sound-emitting portion 11 within the cavum concha is biased downward, and the gap between the upper side surface US of the sound-emitting portion 11 and the cavum concha is too large, resulting in a weak listening effect. When the angle α3 between the line connecting the center of mass H of the sound-emitting portion 11 and the earhook extreme point N, and the long axis Y of the sound-emitting portion 11, is too small, the upper side surface US of the sound-emitting portion 11 fits against the upper edge of the cavum concha, and the gaps between the upper side surface US and the cavum concha are too small or too few, resulting in a poor sound leakage reduction effect.

[0164] In some embodiments, the second angle α3 between the line N'H' connecting the extreme point N' and the projection point H' of the center of mass H of the sound-emitting portion 11 and the longitudinal axis Y (i.e., the x-axis) of the projection of the sound-emitting portion 11 can be less than 90°. This allows the projection point H' of the center of mass H of the sound-emitting portion 11 to be located behind the extreme point N' along the longitudinal axis Y of the sound-emitting portion 11. In other words, the center of mass H of the sound-emitting portion 11 is closer to the back of the user's head than the corresponding point N of the extreme point N' on the earhook 12, thereby further enhancing the stability of the aforementioned "clamping force lever." It should be noted that the angle α3 between the line N'H' connecting the extreme point N' and the projection point H' of the center of mass H of the sound-emitting portion 11 and the longitudinal axis Y (i.e., the x-axis) of the projection of the sound-emitting portion 11 refers to the angle between the line N'H' and the x-axis in the counterclockwise direction relative to the positive direction of the x-axis, as shown in FIG5 .

[0165] In some embodiments, to achieve a better listening experience, the second angle α3 between the line N'H' connecting the extreme point N' and the projection point H' of the center of mass H of the sound-emitting portion 11 and the long axis Y (i.e., the x-axis) of the projection of the sound-emitting portion 11 can be in the range of 65°-85°. In some embodiments, to further improve the sound leakage reduction effect, the second angle α3 between the line N'H' connecting the extreme point N' and the projection point H' of the center of mass H of the sound-emitting portion 11 and the long axis Y (i.e., the x-axis) of the projection of the sound-emitting portion 11 can be in the range of 70°-80°. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the cavum concha have a more suitable volume and opening size / number, and to make the clamping position of the sound-emitting part 11 located at a better position in the cavum concha, the second angle α3 between the line N'H' between the extreme point N' and the projection point H' of the center of mass H of the sound-emitting part 11 and the long axis direction Y (i.e., the x-axis direction) of the projection of the sound-emitting part 11 can be in the range of 75°-79°.

[0166] In some embodiments, in addition to reflecting the second angle α3 between the line connecting the center of mass H of the sound-emitting portion 11 and the extreme point N of the earhook and the long axis Y of the sound-emitting portion 11 through the position of the above-mentioned projection point, actual measurement can also be performed on the earhook 12. In some embodiments, to achieve a better listening experience, on the earphone 10, the second angle α3 between the line connecting the center of mass H of the sound-emitting portion 11 and the extreme point N of the earhook and the long axis Y of the sound-emitting portion 11 can be in the range of 70°-85°. In some embodiments, to further improve the sound leakage reduction effect, on the earphone 10, the second angle α3 between the line connecting the center of mass H of the sound-emitting portion 11 and the extreme point N of the earhook and the long axis Y of the sound-emitting portion 11 can be in the range of 75°-80°. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the cavum concha have a more suitable volume and opening size / number, and to make the clamping position of the sound-emitting part 11 located at a better position in the cavum concha, on the earphone 10, the second angle α3 between the line connecting the center of mass H of the sound-emitting part 11 and the extreme point N of the earhook and the long axis direction Y of the sound-emitting part 11 can be in the range of 77°-80°.

[0167] In some embodiments, on the user's sagittal plane, a first angle α2 formed between the line segment N'F' connecting the extreme point N' and the projection point F' of the center of mass F of the earphone 10 and the longitudinal axis Y (i.e., the x-axis) of the projection of the sound-emitting portion 11 is smaller than a second angle α3 formed between the line segment N'H' connecting the extreme point N' and the projection point H' of the center of mass H of the sound-emitting portion 11 and the longitudinal axis Y (i.e., the x-axis). In other words, the first angle α2 formed between the line segment N'F' and the x-axis is smaller than the second angle α3 formed between the line segment N'H' and the x-axis. This allows the center of mass F of the earphone 10 to be positioned posterior to the center of mass H of the sound-emitting portion 11 along the longitudinal axis Y of the sound-emitting portion 11, i.e., the center of mass F of the earphone 10 is closer to the back of the user's head than the center of mass H of the sound-emitting portion 11. This arrangement allows the ear hook 12 to better clamp the ear of the user when the earphone 10 is worn, further enhancing the stability of the aforementioned "clamping force lever."

[0168] In some embodiments, the angle α4 between the line connecting the earhook extreme point N and the center of mass H of the sound-emitting portion 11 and the plane S1 of the earhook 12 (also referred to as the earhook plane S1) can affect the extent to which the sound-emitting portion 11 penetrates the user's cavum concha when the earphone 10 is worn. If the angle α4 between the line connecting the earhook extreme point N and the center of mass H of the sound-emitting portion 11 and the plane of the earhook 12 is too small, the sound-emitting portion 11 may penetrate too deeply into the cavum concha, and the sound-emitting portion 11 may be too close to the opening of the user's ear canal. In this case, the opening of the ear canal is effectively blocked to a certain extent, preventing communication between the ear canal and the external environment, thus defeating the original design purpose of the earphone 10. If the angle α4 between the line connecting the earhook extreme point N and the center of mass H of the sound-emitting portion 11 and the plane of the earhook 12 is too large, the sound-emitting portion 11 may be prevented from protruding into the cavum concha (for example, resulting in an excessively large gap between the sound-emitting portion 11 and the cavum concha), thereby affecting the listening experience of the sound-emitting portion 11.

[0169] FIG13 is a schematic diagram of an exemplary position of the center of mass of the sound-emitting part according to some embodiments of the present specification. Referring to FIG13 , in some embodiments, in order to provide the earphone 10 with a better listening experience, the angle α4 between the line HN connecting the earhook extreme point N and the center of mass H of the sound-emitting part 11 and the plane S1 of the earhook 12 may be in the range of 10°-18°. The plane S1 of the earhook 12 may be determined by the upper vertex K on the earhook 12, the earhook extreme point N, the point Q on the earhook 12, and the point P on the earhook 12, as shown in FIG3 . In some embodiments, in order to further prevent the sound-emitting part 11 from being too close to the user's ear canal opening, the angle α4 between the line HN connecting the earhook extreme point N and the center of mass H of the sound-emitting part 11 and the plane S1 of the earhook 12 may be in the range of 12°-16°. In some embodiments, in order to further improve the listening effect, the angle α4 between the line HN between the ear hook extreme point N and the center of mass point H of the sound emitting part 11 and the plane S1 of the ear hook 12 can be in the range of 13°-14°.

[0170] In some embodiments, the angle between the inner side surface IS of the sound-emitting portion 11 and the plane S1 on which the ear hook 12 is located can also affect the insertion of the sound-emitting portion 11 into the concha cavity. The angle between the inner side surface IS of the sound-emitting portion 11 and the plane S1 on which the ear hook 12 is located refers to the smaller angle formed by the intersection of the two planes. If the angle is too large, the sound-emitting portion 11 may extend too far into the concha cavity, the position of the sound-emitting portion 11 may be too close to the opening of the user's ear canal, possibly blocking the opening of the ear canal, and the sound-emitting portion 11 may put pressure on the user's tragus. If the angle is too small, the sound-emitting portion 11 may extend too little into the concha cavity, and the gap between the sound-emitting portion 11 and the concha cavity may be too large, thereby affecting the listening effect of the sound-emitting portion 11.

[0171] FIG14 is a schematic diagram of exemplary positions of the inner side surface of the sound-emitting part and the plane of the ear hook according to some embodiments of this specification. As shown in FIG14 , in some embodiments, in order to prevent the sound-emitting part 11 from blocking the opening of the ear canal, the angle between the inner side surface IS of the sound-emitting part 11 and the plane S1 where the ear hook 12 is located can be 15°-25°. In some embodiments, in order to further improve the listening effect, the angle between the inner side surface IS of the sound-emitting part 11 and the plane S1 where the ear hook 12 is located can be 17°-23°. In some embodiments, in order to make the cavity-like structure formed by the sound-emitting part 11 and the cavum concha have a more suitable volume and opening size / number, the angle between the inner side surface IS of the sound-emitting part 11 and the plane S1 where the ear hook 12 is located can be 19°-20°.

[0172] In some embodiments, the maximum vertical distance between the ear hook 12 and the inner side surface IS of the sound-emitting portion 11 is designed so that when the earphone 10 is worn, the user's ear can be well accommodated between the ear hook 12 and the sound-emitting portion 11, allowing the ear hook 12 to fit the user's ear well, thereby improving the wearing comfort and stability of the earphone 10. If the maximum vertical distance between the ear hook 12 and the inner side surface IS of the sound-emitting portion 11 is too large, the wearing stability of the earphone 10 will be affected. If the maximum vertical distance between the ear hook 12 and the inner side surface IS of the sound-emitting portion 11 is too small, the adjustability of the earphone 10 will be affected.

[0173] Figure 15 is a schematic diagram of an exemplary position of the point on the ear hook that is the farthest vertically from the inner side surface IS of the sound-emitting portion according to some embodiments of this specification. As shown in Figure 15, in some embodiments, on the XY plane, the point on the ear hook 12 that is the farthest vertically from the inner side surface IS of the sound-emitting portion 11 is point R. In some embodiments, to provide the earphone 10 with better wearing stability and adjustability, the vertical distance between point R and the inner side surface IS of the sound-emitting portion 11 can be 6mm-9mm. That is, the farthest vertical distance between the ear hook 12 and the inner side surface IS of the sound-emitting portion 11 can be 6mm-9mm. In some embodiments, to further improve wearing stability, the vertical distance between point R and the inner side surface IS of the sound-emitting portion 11 can be 7mm-8mm. In some embodiments, to further improve adjustability, the vertical distance between point R and the inner side surface IS of the sound-emitting portion 11 can be 7.5mm-7.9mm.

[0174] Please refer to Figures 3 and 5. In some embodiments, due to the limited space between the user's ear and head, in order to facilitate the user's wearing, the cross-section of the ear hook 12 at the ear hook extreme point N is set to be smaller, while due to the volume limit of the battery in the battery compartment 13, the cross-section of the battery compartment 13 is set to be larger. Therefore, in order to make the shape of the ear hook 12 smoothly transition, the section of the ear hook 12 connected to the battery compartment 13 can be set as a transition section (not marked in the figure). In some embodiments, the transition section can be the first part 121 of the ear hook 12, excluding the battery compartment 13, with a cross-section greater than 17.99mm. 2 As shown in Figure 5, in some embodiments, the transition section may be the section in the first part 121 of the ear hook 12 where the cross-sectional area changes at the fastest rate, the starting point G1 corresponding to the transition section may be the position with the smallest cross-sectional area in the section, and the ending point G2 corresponding to the transition section may be the position with the largest cross-sectional area in the section. In some embodiments, the transition section may be connected to the battery compartment 12 via the ending point G2. It should be noted that point G1' and point G2' shown in Figure 5 are the projection points of the starting point G1 and the ending point G2 of the transition section on the sagittal plane of the user, respectively.

[0175] In some embodiments, the transition section (or its cross section) can be set to a shape that is narrow at the top and wide at the bottom (for example, a pear shape) in the direction toward the sound-emitting portion 11, so as to increase the area of ​​the portion that fits the user's ear. In some embodiments, the projection of the transition section along the long axis direction Y and the projection of the sound-emitting portion 11 along the long axis direction Y have an overlapping area. The projection along the long axis direction Y can be understood as a positive projection on a reference plane perpendicular to the long axis direction Y (for example, the XZ plane in Figure 5). By setting the overlapping area between the transition section and the projection of the sound-emitting portion 11 along the long axis direction Y, when the user wears the earphones, the sound-emitting portion 11 and the transition section can jointly clamp the user's ear (for example, the front and back sides of the cavum concha), thereby improving the wearing stability of the earphones 10. In some embodiments, the overlapping area between the projection of the transition section along the long axis direction Y and the projection of the sound-emitting portion 11 along the long axis direction Y accounts for no less than 50% of the projection of the sound-emitting portion 11 along the long axis direction Y. In some embodiments, to further improve the wearing stability of the earphone 10, the overlapping area between the projection of the transition section along the longitudinal axis Y and the projection of the sound-emitting portion 11 along the longitudinal axis Y accounts for no less than 70% of the projection of the sound-emitting portion 11 along the longitudinal axis Y. In some embodiments, to further improve the wearing stability of the earphone 10, the overlapping area between the projection of the transition section along the longitudinal axis Y and the projection of the sound-emitting portion 11 along the longitudinal axis Y accounts for no less than 80% of the projection of the sound-emitting portion 11 along the longitudinal axis Y.

[0176] Since the transition section is the main contact area with the ear hook 12 for clamping the ear when the user wears the earphone 10, the length of the transition section can affect the sense of pressure (for example, pressure) exerted by the ear hook 12 on the ear. Reasonable setting of the length of the transition section can improve the wearing performance of the earphone 10. In order to conveniently express the length of the transition section, referring to FIG5 , the length of the transition section can be characterized by the arc length of the inner curve of the projection of the transition section on the sagittal plane of the user (i.e., the curve segment between point G1' and point G2'). Referring to FIG5 , in some embodiments, in order to reduce the sense of pressure exerted by the transition section on the user's ear, the arc length of the inner curve of the projection of the transition section of the earphone 10 on the sagittal plane of the user is 10mm-14mm. In some embodiments, in order to further reduce the size of the earphone 10 while taking into account the reduction of the sense of pressure exerted by the transition section on the user's ear, the arc length of the inner curve of the projection of the transition section of the earphone 10 on the sagittal plane of the user is 11mm-13mm.

[0177] In some embodiments, by designing the distance from the transition section's starting point G1 to the upper vertex K or the earhook's extreme point N, the transition section's position on the back of the ear can be adjusted when the earphone 10 is worn, thereby changing the direction of the clamping force exerted by the earhook 12 on the ear. In some embodiments, by designing the distance from the transition section's starting point G1 to the upper vertex K or the extreme point N, the overlap area between the transition section's projection along the longitudinal axis Y and the sound-emitting portion 11's projection along the longitudinal axis Y can also be adjusted, thereby improving the wearing stability of the earphone 10.

[0178] In some embodiments, to ensure better wearing stability of the earphone 10, when worn, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the extreme point N', as projected on the user's sagittal plane, can be 24 mm to 28 mm. In some embodiments, to ensure an appropriate size of the overlapping area between the projection of the transition section along the longitudinal axis Y and the projection of the sound-producing portion 11 along the longitudinal axis Y, when worn, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the extreme point N', as projected on the user's sagittal plane, can be 25 mm to 27 mm. In some embodiments, to ensure an appropriate direction of the clamping force exerted by the earhook 12 on the ear, when worn, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the extreme point N', as projected on the user's sagittal plane, can be 26 mm to 26.5 mm.

[0179] In some embodiments, to ensure better wearing stability of the earphone 10, when not wearing the earphone 10, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the extreme point N' on the projection of the earphone 10 on the user's sagittal plane can be 22mm-26mm. In some embodiments, to ensure that the overlapping area between the projection of the transition section along the longitudinal axis Y and the projection of the sound-emitting portion 11 along the longitudinal axis Y is appropriately sized, when not wearing the earphone 10, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the extreme point N' on the projection of the earphone 10 on the user's sagittal plane can be 23mm-26.5mm. In some embodiments, to ensure that the clamping force of the earhook 12 on the ear has an appropriate direction, when not wearing the earphone 10, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the extreme point N' on the projection of the earphone 10 on the user's sagittal plane can be 24mm-25mm.

[0180] In some embodiments, to ensure better wearing stability of the earphone 10, when the earphone 10 is worn, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the projection point K' of the upper vertex K, as projected on the user's sagittal plane, can be 31 mm to 35 mm. In some embodiments, to ensure an appropriate size of the overlapping area between the projection of the transition section along the longitudinal axis Y and the projection of the sound-producing portion 11 along the longitudinal axis Y, when the earphone 10 is worn, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the projection point K' of the upper vertex K, as projected on the user's sagittal plane, can be 32 mm to 34 mm. In some embodiments, to ensure an appropriate direction of the clamping force exerted by the earhook 12 on the ear, when the earphone 10 is worn, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the projection point K' of the upper vertex K, as projected on the user's sagittal plane, can be 32.5 mm to 33 mm.

[0181] In some embodiments, to ensure better wearing stability of the earphone 10, when not wearing the earphone 10, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the projection point K' of the upper vertex K, as projected on the user's sagittal plane, can be 28 mm to 32 mm. In some embodiments, to ensure an appropriate size of the overlapping area between the projection of the transition section along the longitudinal axis Y and the projection of the sound-emitting portion 11 along the longitudinal axis Y, when not wearing the earphone 10, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the projection point K' of the upper vertex K, as projected on the user's sagittal plane, can be 29 mm to 31 mm. In some embodiments, to ensure an appropriate direction of the clamping force exerted by the earhook 12 on the ear, when not wearing the earphone 10, the distance between the starting point G1' of the inner curve of the projection of the transition section of the earphone 10 and the projection point K' of the upper vertex K, as projected on the user's sagittal plane, can be 30 mm to 30.8 mm.

[0182] In some embodiments, by designing the angle α5 between the line connecting the starting point G1' and the extreme point N' of the inner curve of the projection of the transition section on the user's sagittal plane, and the line connecting the starting point G1' of the transition section and the projection point K' of the upper vertex K, the degree of fit of the section of the ear hook 12 located between the upper vertex K and the transition section on the back of the ear when worn can be adjusted, thereby affecting the stability of the user wearing the earphone 10. In some embodiments, when the positions of the ear hook extreme point N and the upper vertex K are determined, by designing the angle α5 between the line connecting the starting point G1' and the extreme point N' of the inner curve of the projection of the transition section on the user's sagittal plane, and the line connecting the starting point G1' of the transition section and the projection point K' of the upper vertex K, the size of the overlapping area between the projection of the transition section along the long axis Y and the projection of the sound-emitting portion 11 along the long axis Y can also be adjusted, thereby improving the wearing stability of the earphone 10.

[0183] In some embodiments, to ensure better wearing stability of the headset 10, when the headset 10 is worn, on the projection of the headset 10 on the user's sagittal plane, the angle α5 between the line connecting the starting point G1' of the projected inner curve of the transition section and the extreme point N' and the line connecting the starting point G1' of the transition section and the projection point K' of the upper vertex K can be 18°-22°. In some embodiments, to further improve the wearing stability of the headset 10, when the headset 10 is worn, on the projection of the headset 10 on the user's sagittal plane, the angle α5 between the line connecting the starting point G1' of the projected inner curve of the transition section and the extreme point N' and the line connecting the starting point G1' of the transition section and the projection point K' of the upper vertex K can be 18.5°-21°. In some embodiments, in order to further improve the wearing stability of the earphone 10, in the wearing state, on the projection of the earphone 10 on the sagittal plane of the user, the angle α5 between the line connecting the starting point G1' of the projected inner curve of the transition section and the extreme point N' and the line connecting the starting point G1' of the transition section and the projection point K' of the upper vertex K can be 19°-20°.

[0184] In some embodiments, to provide the headset 10 with better wearing stability, in the non-worn state, on the projection of the headset 10 on the user's sagittal plane, the angle α5 between the line connecting the starting point G1' of the projected inner curve of the transition section and the extreme point N' and the line connecting the starting point G1' of the transition section and the projection point K' of the upper vertex can be 20°-24°. In some embodiments, to further improve the wearing stability of the headset 10, in the non-worn state, on the projection of the headset 10 on the user's sagittal plane, the angle α5 between the line connecting the starting point G1' of the projected inner curve of the transition section and the extreme point N' and the line connecting the starting point G1' of the transition section and the projection point K' of the upper vertex can be 20.4°-22°. In some embodiments, to further improve the wearing stability of the earphone 10, in the non-wearing state, on the projection of the earphone 10 on the sagittal plane of the user, the angle α5 between the line connecting the starting point G1' of the projected inner curve of the transition section and the extreme point N' and the line connecting the starting point G1' of the transition section and the projection point K' of the upper vertex can be 20.5°-21°.

[0185] Figure 16 is an exemplary schematic diagram of the smallest cross-section of an earhook, according to some embodiments of this specification. In some embodiments, the smallest cross-section of the earhook is the cross-section located at the earhook's extreme point N. The projection of this cross-section along the major axis Y forms the axisymmetric plane S2. It should be understood that the arc segment between the transition segment's end point G2 and the upper vertex K has different dimensions than the axisymmetric plane S2, but a similar shape.

[0186] Referring to FIG. 16 , in some embodiments, the projection of the axial symmetric plane S2 of the smallest cross-section of the ear hook along the long axis direction Y can be a shape that is narrower at one end and wider at the other end (e.g., pear-shaped, egg-shaped, teardrop-shaped, etc.). The narrower end of the axial symmetric plane S2 has a first endpoint I1, and the wider end of the axial symmetric plane S2 has a second endpoint I2. When worn, the second endpoint I2 is closer to the auricle than the first endpoint I1, so that the area of ​​contact between the ear hook 12 and the user's ear is primarily the area corresponding to the wider end, thereby increasing the contact area between the ear hook portion corresponding to the axial symmetric plane S2 and the user's auricle. This allows the ear hook 12 to cooperate with the sound-emitting portion 11 to better clamp the user's ear, thereby improving the wearing stability and adjustability of the earphone 10.

[0187] In some embodiments, by designing the cross-sectional area of ​​the axially symmetrical plane S2, the clamping coefficient of the aforementioned "clamping force lever" can be adjusted, thereby improving the wearing stability and adjustability of the earphone 10. If the cross-sectional area of ​​the axially symmetrical plane S2 is too small, the clamping coefficient of the earhook 12 will be too small, and the clamping force provided by the earhook 12 to the ear 100 will be too small, resulting in poor wearing stability. In addition, a too small cross-sectional area of ​​the axially symmetrical plane S2 will also result in too small a contact area between the earhook 12 and the user's ear when worn, resulting in a greater sense of pressure (e.g., stress) on the user's ear from the earhook 12, and poor wearing comfort of the earphone 10. If the cross-sectional area of ​​the axially symmetrical plane S2 is too large, the clamping coefficient of the earhook 12 will be too large, and the clamping force provided by the earhook 12 to the ear 100 will be too large, resulting in poor adjustability after wearing. In addition, a too large cross-sectional area of ​​the axially symmetrical plane S2 may cause the earhook 12 to interfere with or squeeze the user's ear when worn, resulting in poor wearing comfort of the earphone 10.

[0188] In some embodiments, in order to make the earphone 10 have better wearing stability and adjustability, the cross-sectional area of ​​the axisymmetric plane S2 can be within the range of 5mm 2 -9mm 2 In some embodiments, in order to further improve wearing stability, the cross-sectional area of ​​the axisymmetric plane S2 can be 6mm 2 -8mm 2 In some embodiments, in order to further improve adjustability, the cross-sectional area of ​​the axisymmetric plane S2 may be in the range of 6.5 mm. 2 -7.5mm 2 .

[0189] In some embodiments, two points with the greatest distance in any direction can be identified on the outer contour of the axisymmetric plane S2. These two points can be used to determine the major axis of the axisymmetric plane S2. In some embodiments, the distance between the first endpoint I1 and the second endpoint I2 of the axisymmetric plane S2 is the greatest. The major axis of the axisymmetric plane S2 is the line I1I2 connecting the first endpoint I1 and the second endpoint I2.

[0190] In some embodiments, in a direction perpendicular to the long axis I1I2, two points (point I3 and point I4) with the largest distance between them can be determined on the outer contour of the axially symmetrical plane S2. Then, the line I3I4 connecting point I3 and point I4 is the short axis of the axially symmetrical plane S2, and the line I1I2 is perpendicular to the line I3I4.

[0191] In some embodiments, the lengths of the major axis I1I2 and the minor axis I3I4 determine the cross-sectional area of ​​the axially symmetrical plane S2. If the lengths of the major axis I1I2 and the minor axis I3I4 are too large, the cross-sectional area of ​​the axially symmetrical plane S2 will be too large, resulting in an excessively large clamping coefficient of the ear hook 12. The clamping force provided by the ear hook 12 to the ear 100 will be too large, resulting in poor adjustability after wearing. Furthermore, the ear hook 12 may interfere with or squeeze the user's ear when worn, making the earphone 10 less comfortable to wear. If the lengths of the major axis I1I2 and the minor axis I3I4 are too small, the cross-sectional area of ​​the axially symmetrical plane S2 will be too small, resulting in an excessively small clamping coefficient of the ear hook 12. The clamping force provided by the ear hook 12 to the ear 100 will be too small, resulting in poor wearing stability. Furthermore, the contact area between the ear hook 12 and the user's ear will be too small when worn, resulting in a greater sense of pressure (e.g., intensity) on the user's ear from the ear hook 12, and poor wearing comfort of the earphone 10.

[0192] In some embodiments, to provide the headset 10 with better wearing stability and adjustability, the length of the major axis I1I2 may be 2 mm to 5 mm. In some embodiments, to further improve wearing stability, the length of the major axis I1I2 may be 2.5 mm to 4 mm. In some embodiments, to further improve adjustability, the length of the major axis I1I2 may be 3 mm to 4.5 mm.

[0193] Furthermore, when the length of the major axis I1I2 remains unchanged, the length of the minor axis I3I4 also determines the size and shape of the wider end of the axially symmetrical plane S2, and the ear hook mainly contacts the user's ear at the wider end. Therefore, if the length of the minor axis I3I4 is too small, the contact area between the ear hook and the user's ear will be too small, the ear hook will exert a greater sense of oppression (such as pressure) on the user's ear, and the earphone 10 may be unstable when worn. If the length of the minor axis I3I4 is too large, the contact area between the ear hook and the user's ear will be too large, and the ear hook may interfere with or squeeze the user's ear when worn, and will affect the adjustability of the earphone 10.

[0194] In some embodiments, to provide the headset 10 with better wearing stability and adjustability, the length of the short axis I3I4 may be 1.5 mm to 4.5 mm. In some embodiments, to further improve wearing stability, the length of the short axis I3I4 may be 2 mm to 4 mm. In some embodiments, to further improve adjustability, the length of the short axis I3I4 may be 2.5 mm to 3 mm.

[0195] Referring to FIG. 16 , in some embodiments, a second rectangular coordinate system x'o'y' can be established, with the direction of the major axis I1I2 of the axially symmetric plane S2 as the horizontal coordinate axis x', the direction perpendicular to the major axis I1I2 (i.e., the direction of the minor axis I3I4) as the coordinate axis y', and the intersection of the x' axis and the y' axis as the origin o'.

[0196] In some embodiments, the major axis I1I2 of the axially symmetrical plane S2 can be the axis of symmetry of the axially symmetrical plane S2, and the outer contour curves of the two half-planes of the axially symmetrical plane S2 on either side of the major axis I1I2 are identical. In some embodiments, the outer contour curve of the half-plane on one side (e.g., the upper side or the lower side) of the major axis I1I2 (i.e., the axis of symmetry) is defined as the second curve L2. In some embodiments, the two endpoints of the second curve L2 (e.g., the first endpoint I1 and the second endpoint I2) can be the two endpoints of the major axis I1I2 (e.g., the first endpoint I1 and the second endpoint I2), respectively. The second curve L2 is the outer contour of the axially symmetrical plane S2 between the two endpoints of the major axis I1I2 (e.g., the outer contour on either side of the major axis I1I2). In some embodiments, the second curve L2 has an extreme point in a direction perpendicular to the axis of symmetry (major axis I1I2) (i.e., in the direction of the y' axis). In some embodiments, since the length of the minor axis I3I4 is greatest in a direction perpendicular to the axis of symmetry I1I2, and the axially symmetrical plane S2 is symmetrical about the axis of symmetry I1I2, the point on the outer contour of the axially symmetrical plane S2 on one side (upper or lower) of the axis of symmetry I1I2 at the greatest distance from the axis of symmetry I1I2 is the endpoint of the minor axis I3I4. Based on the definition of an extreme point, a second curve L2 corresponding to the outer contour curve of a half-plane located on one side (e.g., upper or lower) of the major axis I1I2 (i.e., the axis of symmetry) can be determined, and its extreme point is the endpoint of the minor axis I3I4 on the corresponding side of the axis of symmetry I1I2. For example, if the outer contour curve of the half-plane located above the major axis I1I2 (i.e., the axis of symmetry) is taken as the second curve L2, then its extreme point is the endpoint I3 of the minor axis I3I4 above the axis of symmetry I1I2.

[0197] In some embodiments, when worn, along the long axis I1I2, the extreme point (I3 or I4) of the second curve L2 is closer to the second endpoint I2 than to the first endpoint I1. Therefore, the axially symmetrical plane S2 is wider at the end closer to the second endpoint I2 and narrower at the end closer to the first endpoint I1. Because the second endpoint I2 is closer to the auricle, the area of ​​the earhook that contacts the user is the area corresponding to the wider end closer to the second endpoint I2. This increases the contact area between the earhook and the user, prevents the earhook from exerting excessive pressure (e.g., stress) on the user's ear, and improves the wearing stability of the earphone 10.

[0198] In some embodiments, in the direction of the symmetry axis I1I2, the ratio of the distance from the extreme point (e.g., the extreme point I3) to the first endpoint I1 to the distance from the extreme point (e.g., the extreme point I3) to the second endpoint I2 determines the shape and size of the wider end of the axial symmetry plane S2 near the second endpoint I2, thereby affecting the contact area between the ear hook and the user's ear. If, in the direction of the symmetry axis I1I2, the ratio of the distance from the extreme point (e.g., the extreme point I3) to the first endpoint I1 to the distance from the extreme point (e.g., the extreme point I3) to the second endpoint I2 is too large, the extreme point I3 is too close to the second endpoint I2, that is, the short axis I3I4 is too close to the second endpoint I2, which will cause the wider end of the axial symmetry plane S2 near the second endpoint I2 to be too large, and the contact area between the ear hook and the user's ear to be too large. This will cause the ear hook to interfere with the user's ear when worn, and will affect the adjustability of the earphone 10. If in the direction of the symmetry axis I1I2, the ratio of the distance between the extreme point (for example, the extreme point I3) and the first endpoint I1 to the distance between the extreme point (for example, the extreme point I3) and the second endpoint I2 is too small, the extreme point I3 is too far away from the second endpoint I2, that is, the short axis I3I4 is too far away from the second endpoint I2, which will cause the wider end of the axial symmetry plane S2 close to the second endpoint I2 to be too small, the contact area between the ear hook and the user's ear is too small, the ear hook exerts a greater sense of pressure (for example, pressure) on the user's ear, and the earphone 10 may be unstable when worn.

[0199] In some embodiments, in order to improve the wearing stability of the earphone 10, in the direction of the symmetry axis I1I2 (i.e., in the x'-axis direction), the ratio of the distance from the extreme point (e.g., the extreme point I3) of the outer contour curve (i.e., the third curve L3) to the first endpoint I1 of the outer contour curve to the distance from the extreme point (e.g., the extreme point I3) to the second endpoint I2 of the outer contour curve can be 1.5-2.5. That is, referring to Figure 17, in the second rectangular coordinate system x'o'y', the ratio of the absolute value of the difference between the horizontal coordinates of point I3 and point I1 to the absolute value of the difference between the horizontal coordinates of point I3 and point I2 can be 1.5-2.5. In some embodiments, in order to further improve the wearing stability, in the direction of the symmetry axis I1I2, the ratio of the distance from the extreme point (e.g., the extreme point I3) to the first endpoint I1 to the distance from the extreme point (e.g., the extreme point I3) to the second endpoint I2 can be 1.8-2.2. In some embodiments, in order to further improve adjustability, in the direction of the symmetry axis I1I2, the ratio of the distance from the extreme point (for example, the extreme point I3) to the first endpoint I1 to the distance from the extreme point (for example, the extreme point I3) to the second endpoint I2 can be 1.9-2.1.

[0200] To sum up, by designing the position of the extreme point (for example, the extreme point I3) of the outer contour curve (the second curve L2), the contact surface between the ear hook 12 and the user's auricle when the earphone 10 is worn can be adjusted, thereby improving the wearing stability and adjustability of the earphone 10.

[0201] FIG17 is a schematic diagram of an exemplary fitting function curve of a second curve according to some embodiments of this specification. As shown in FIG16 and FIG17 , in some embodiments, the extreme point (e.g., extreme point I3) of the second curve L2 can be determined by curve fitting. For example only, the x'-axis of the x'o'y' coordinate system is set at the position of the major axis I1I2 of the axially symmetric plane S2, the origin o' is set at the midpoint of the major axis I1I2, and the y'-axis is set at a position passing through the origin o' and perpendicular to the x'-axis.

[0202] In the second rectangular coordinate system x'o'y', the second curve L2 is fitted by a univariate quartic polynomial function, and the fitting function relationship of the second curve L2 can be obtained: t = -0.3923*s^4 - 0.1377*s^3 + 0.0112*s^2 + 0.2297*s + 1.318 (Relationship 4)

[0203] In some embodiments, the second curve L2 has two zero points, corresponding to the first endpoint I1 and the second endpoint I2, as determined by equation 4. In some embodiments, the coordinates of the first endpoint I1 are (-1.375, 0), and the coordinates of the second endpoint I2 are (1.375, 0).

[0204] It should be noted that the functional relationship (e.g., Equation 4) for the second curve L2 obtained by polynomial fitting is an approximate expression of the second curve L2. When the number of sampling points for fitting the functional relationship is large (e.g., greater than 10) and evenly distributed, the curve represented by the functional relationship can be considered to be the second curve L2. The functional relationships fitted in this specification are merely examples and are primarily used to describe the characteristics of the second curve L2 (including extreme points, inflection points, first-order derivatives, second-order derivatives, etc.). The specific functional relationship (e.g., Equation 4) for the second curve L2 is related to the selection of the origin o' of the coordinate system x'o'y'. The functional relationship will also vary when the origin o' is different. However, when the directions of the horizontal axis (x' axis) and vertical axis (y' axis) of the coordinate system remain unchanged, the position of the extreme point of the second curve L2 on the second curve L2 is fixed, and the properties of the first-order derivative and second-order derivative of the second curve L2 are also fixed and do not change with the position of the origin o' of the coordinate system x'o'y'. This description is non-limiting with respect to the selection of the origin o' of the coordinate system x'o'y' for fitting the second curve L2 and the functional expression of the second curve L2.

[0205] In some embodiments, the second curve L2 has only one extreme point, which is the maximum point I3, and the corresponding coordinates are (0.4599, 1.3951).

[0206] In some embodiments, for more description on the determination of the extreme point of the second curve L2, reference may be made to the relevant content of the extreme point of the first curve L1, which will not be repeated here.

[0207] FIG18 is a schematic diagram of an exemplary first-order derivative curve of a fitting curve according to some embodiments of the present specification. As shown in FIG18 , in some embodiments, within the second rectangular coordinate system x′o′y′, for the second curve L2, it has a first-order derivative: t′=-1.5692*s^3-0.4131*s^2+0.0224*s+0.2297 (Equation 5)

[0208] In some embodiments, the first derivative of the second curve L2 is continuous.

[0209] In some embodiments, within the second rectangular coordinate system x'o'y', the first-order derivative of the second curve L2 has an inflection point. In some embodiments, within the second rectangular coordinate system x'o'y', the first-order derivative of the second curve L2 has an inflection point, namely, point E1. As shown in Figure 18 , to the left of point E1, the graph of the first-order derivative is a concave function; to the right of point E1, the graph of the first-order derivative is a convex function. Point E1, as the point where the concavity and convexity of the graph of the first-order derivative change, is the inflection point of the first-order derivative. For more information on determining inflection points, please refer to Figures 7-9 and the related descriptions, which will not be repeated here.

[0210] In some embodiments, within the second rectangular coordinate system x'o'y', the first-order derivative of the second curve L2 has a zero point (0.4559, 0).

[0211] In some embodiments, in the second rectangular coordinate system x'o'y', the first-order derivative of the second curve L2 has two extreme points, and their corresponding abscissas are x1=0.1994 and x2=-0.0239 respectively.

[0212] FIG19 is a diagram illustrating an exemplary second-order derivative curve of a fitting curve according to some embodiments of the present specification. As shown in FIG19 , in some embodiments, for the second curve L2, it has a second-order derivative: t″=-4.7076*s^2-0.8262*s+0.0224 (Equation 6)

[0213] In some embodiments, the second derivative of the second curve L2 is continuous.

[0214] In some embodiments, within the second rectangular coordinate system x'o'y', the second-order derivative of the fitting curve L4 of the third curve L3 has a maximum point, namely, point E2. As shown in FIG19 , the second-order derivative of the fitting curve L4 on both sides of point E2 is located below point E2. That is, in the area to the left and right of point E2, the second-order derivative function value corresponding to point E2 is the largest, and point E2 is the maximum point of the second-order derivative.

[0215] In some embodiments, the coordinates of the maximum point E2 of the second-order derivative are (-0.08775, 0.0587). In some embodiments, the coordinates of the maximum point E2 of the second-order derivative can be determined by referring to the relevant content of the extreme point of the fitting curve L2 of the first curve L1, which will not be repeated here.

[0216] In some embodiments, through the above-mentioned design of the second curve L2 (Equation 4), the first-order derivative of the second curve L2 (Equation 5) and the second-order derivative of the second curve L2 (Equation 6), the ear hook 12 can have a cross-section of a preset shape (the outer contour curve of the preset curve feature) at the extreme point N' of the first curve L1, thereby increasing the contact area between the ear hook 12 and the user's ear in the wearing state, so that the ear hook 12 can cooperate with the sound-emitting part 11 to better clamp the user's ear, thereby improving the wearing stability and adjustability of the earphone 10.

[0217] As shown in Figure 20, in some embodiments, the housing 111 is inserted into the user's cavum conchae 102 and / or the inner side of the clamping area is provided with a flexible material. The Shore hardness of this flexible material needs to be maintained within a certain range. If the Shore hardness of the flexible material is too high, the comfort of the sound-emitting portion 11 when worn will be reduced. In some embodiments, to meet wearing requirements, the Shore hardness of the flexible material can range from 0HA to 40HA. In some embodiments, to improve comfort, the Shore hardness of the flexible material can range from 0HA to 20HA.

[0218] The flexible material may be a flexible insert 1119, the hardness of which is less than that of the housing 111. The housing 111 may be made of plastic; the flexible insert 1119 may be made of silicone, rubber, or the like, and may be formed by injection molding within the clamping region and / or the inner side of the clamping region. Furthermore, the flexible insert 1119 may at least partially cover the region of the housing 111 corresponding to the free end FE, i.e., the clamping region and / or the inner side of the clamping region, so that the sound-emitting portion 11 at least partially rests within the cavum concha 102 via the flexible insert 1119. In other words, the portion of the housing 111 that extends into and contacts the cavum concha 102 may be covered by the flexible insert 1119. In this way, when the sound-emitting part 11 is against the concha cavity 102, for example, when the sound-emitting part 11 and the ear hook 12 are arranged to jointly clamp the aforementioned ear area from the front and back sides of the ear area corresponding to the concha cavity 102 of the ear 100, the flexible insert 1119 acts as a buffer between the shell 111 and the ear 100 (for example, the aforementioned ear area) to relieve the pressure of the acoustic device 10 on the ear 100, which is conducive to improving the comfort of the acoustic device 10 when worn.

[0219] In some embodiments, the flexible insert 1119 can continuously cover at least a portion of the area of ​​the housing 111 corresponding to the rear side RS, upper side US, and lower side LS. For example, the area of ​​the housing 111 corresponding to the rear side RS is covered by the flexible insert 1119 by more than 90%, and the areas of the housing 111 corresponding to the upper side US and lower side LS are each covered by the flexible insert 1119 by approximately 30%. This ensures both the comfort of the acoustic device 10 when worn and the requirements for installing structural components such as transducers within the housing 111.

[0220] In some embodiments, when viewed along the thickness direction X, the flexible insert 1119 may be arranged in a U-shape.

[0221] In some embodiments, the portion of the flexible insert 1119 corresponding to the lower side LS can rest against the antitragus. The thickness of the portion of the flexible insert 1119 corresponding to the rear side RS can be thinner than the thickness of the portions of the flexible insert 1119 corresponding to the upper side US and the lower side LS, respectively, to ensure good comfort even when the sound-producing part 11 rests against an uneven position within the cavum concha 102.

[0222] Figure 20 is an exemplary exploded view of a sound-emitting portion according to some embodiments of this specification. In some embodiments, the housing 111 may include an inner housing 1111 and an outer housing 1112 that interlock along the thickness direction X. When worn, the inner housing 1111 is positioned closer to the ear 100 than the outer housing 1112. The sound outlet 111a, first pressure relief hole 111c, and second pressure relief hole 111d may all be provided on the inner housing 1111. The transducer's diaphragm is positioned toward the inner housing 1111, forming a first acoustic cavity between the transducer and the inner housing 1111. The parting surface 111b between the outer housing 1112 and the inner housing 1111 is inclined toward the side of the movement inner housing 1111 near the free end FE, allowing the flexible insert 1119 to be positioned as close as possible to the region of the outer housing 1112 corresponding to the free end FE. For example, the flexible insert 1119 may be positioned entirely in the region of the movement outer housing 1112 corresponding to the free end FE, thereby simplifying the structure of the sound-emitting portion 11 and reducing manufacturing costs.

[0223] In some embodiments, the housing 111 may also be provided with a wrapping layer. The Shore hardness of the wrapping layer must be maintained within a certain range. If the Shore hardness is too high, the comfort of the sound-emitting portion 11 is reduced when worn. Furthermore, when the flexible cover 1120 integrally covers at least a portion of the outer surface of the flexible insert 1119, the flexible insert 1119 cannot perform its intended function (e.g., relieving the pressure of the acoustic device 10 on the ear 100 and improving the comfort of the acoustic device 10 when worn). If the Shore hardness is too low, the sidewalls of the sound-emitting portion 11 completely conform to the structure of the cavum concha 102, completely isolating the interior from the external environment and failing to form a cavity-like structure. Consequently, far-field sound leakage cannot be reduced, and the shape cannot be fixed during assembly. In some embodiments, to improve sound leakage reduction, the Shore hardness of the wrapping layer may be in the range of 10HA-80HA. In some embodiments, to improve the comfort of the sound-emitting portion 11 when worn, the Shore hardness of the wrapping layer may be in the range of 15HA-70HA. In some embodiments, the Shore hardness of the wrapping layer may be in the range of 25HA-55HA to form a cavity-like structure between the sound-emitting portion 11 and the cavum conchae 102. In some embodiments, the Shore hardness of the wrapping layer may be in the range of 30HA-50HA to achieve better shaping during assembly.

[0224] The wrapping layer may be a flexible covering 1120, whose hardness is less than that of the housing 111. The housing 111 may be made of plastic; the flexible covering 1120 may be made of silicone, rubber, or other materials and may be applied to a predetermined area of ​​the housing 111 through injection molding, gluing, or other methods. Furthermore, the flexible covering 1120 may integrally cover at least a portion of the outer surface of the flexible insert 1119 and at least a portion of the outer surface of the outer shell 1112 not covered by the flexible insert 1119, thereby enhancing the appearance consistency of the sound-emitting portion 11. Of course, the flexible covering 1120 may further cover the outer surface of the inner shell 1111. The hardness of the flexible insert 1119 is less than that of the flexible covering 1120, allowing for sufficient flexibility. Furthermore, the flexible covering 1120 improves the comfort of the acoustic device 10 when worn and provides sufficient structural strength to protect the flexible insert 1119. Furthermore, the outer surface area of ​​the flexible insert 1119 may be between 126 mm 2 and 189mm 2 If the outer surface area of ​​the flexible insert 1119 is too small, the sound-emitting portion 11 will be less comfortable when worn. If the outer surface area of ​​the flexible insert 1119 is too large, the volume of the sound-emitting portion 11 will be too large. This also defeats the purpose of providing the flexible insert 1119 because the area of ​​the flexible insert 1119 that does not contact the cavum concha 102 is too large. In some embodiments, the thickness of the flexible cover 1120 can be less than the thickness of the outer shell 1112.

[0225] In some embodiments, the inner shell 1111 may include a bottom wall 1113 and a first side wall 1114 connected to the bottom wall 1113. The outer shell 1112 may include a top wall 1115 and a second side wall 1116 connected to the top wall 1115. The second side wall 1116 and the first side wall 1114 interlock with each other along the parting surface 111b and can support each other. When viewed along the minor axis Z, in a reference direction from the connecting end CE to the free end FE (e.g., the direction opposite to the arrow in the major axis Y in FIG. 20 ), the portion of the first side wall 1114 near the free end FE gradually approaches the bottom wall 1113 in the thickness direction X, while the portion of the second side wall 1116 near the free end FE gradually moves away from the top wall 1115 in the thickness direction X, such that the parting surface 111b tilts toward the inner shell 1111 in the direction near the free end FE. In this case, the flexible insert 1119 is at least partially disposed on the outside of the second side wall 1116. For example, referring to FIG. 20 , the flexible insert 1119 is not only disposed on the outer side of the second side wall 1116 , but is also partially disposed on the outer side of the top wall 1115 .

[0226] In some embodiments, the housing 1112 may be provided with an embedding groove located at least partially on the second sidewall 1116. The flexible insert 1119 may be embedded in the embedding groove, so that the outer surface of the area of ​​the housing 1112 not covered by the flexible insert 1119 forms a continuous transition with the outer surface of the flexible insert 1119. The area where the flexible insert 1119 is located in FIG. 20 can be simply considered the embedding groove. This not only facilitates the accumulation of the flexible insert 1119 on the housing 1112 during the injection molding process, preventing overflow of the flexible insert 1119, but also improves the appearance of the sound-emitting portion 11 by preventing any uneven surface.

[0227] In some embodiments, the second sidewall 1116 may include a first sub-sidewall segment 1117 and a second sub-sidewall segment 1118 connected to the first sub-sidewall segment 1117. The first sub-sidewall segment 1117 is closer to the top wall 1115 than the second sub-sidewall segment 1118 in the thickness direction X, and the second sub-sidewall segment 1118 protrudes toward the outside of the housing 111 compared to the first sub-sidewall segment 1117. In short, the second sidewall 1116 may have a stepped structure. This structure not only facilitates the accumulation of the flexible insert 1119 on the housing 1112 during the injection molding process, preventing the flexible insert 1119 from overflowing, but also helps the sound-emitting portion 11 better abut against the cavum concha 102 via the flexible insert 1119, thereby improving the comfort of the acoustic device 10 when worn.

[0228] The earphone 10 shown in FIG21 is taken as an example to describe the earphone 10 in detail. It should be noted that the structure and corresponding parameters of the earphone 10 in FIG21 can also be applied to earphones of other configurations mentioned above without violating the corresponding acoustic principles.

[0229] By locating the sound-emitting portion 11 at least partially at the user's antihelix 105, the output effect of the earphone can be improved, that is, the sound intensity at the near-field listening position is increased while the volume of far-field sound leakage is reduced. When the user wears the earphone 10, one or more sound outlet holes can be provided on the side of the shell of the sound-emitting portion 11 close to or facing the user's ear canal, and one or more pressure relief holes are provided on the other side walls of the shell of the sound-emitting portion 11 (for example, the side walls away from or facing away from the user's ear canal). The sound outlet holes are acoustically coupled to the front cavity of the earphone 10, and the pressure relief holes are acoustically coupled to the back cavity of the earphone 10. Taking the example of the sound-emitting portion 11 including a sound outlet hole and a pressure relief hole, the sound output by the sound outlet hole and the sound output by the pressure relief hole can be approximately regarded as two sound sources, and the sound waves of the two sound sources are in opposite phases. The sound emitted by the sound outlet hole can be transmitted directly to the user's ear canal opening without hindrance, while the sound emitted by the pressure relief hole needs to bypass the shell of the sound-emitting portion 11 or pass through the gap formed between the sound-emitting portion 11 and the antihelix 105. At this point, the sound-emitting portion 11 and the antihelix 105 can form a structure similar to a baffle (the antihelix 105 is equivalent to the baffle), wherein the sound source corresponding to the sound outlet is located on one side of the baffle, and the sound source corresponding to the pressure relief hole is located on the other side of the baffle, forming the acoustic model shown in Figure 22. As shown in Figure 22, when a baffle is provided between point sound source A1 and point sound source A2, in the near field, the sound field of point sound source A2 needs to bypass the baffle to interfere with the sound waves of point sound source A1 at the listening position, which is equivalent to increasing the sound path from point sound source A2 to the listening position. Therefore, assuming that point sound source A1 and point sound source A2 have the same amplitude, the difference in amplitude between the sound waves of point sound source A1 and point sound source A2 at the listening position increases compared to the case where no baffle is provided, thereby reducing the degree of cancellation of the two sounds at the listening position, resulting in an increase in the volume at the listening position. In the far field, since the sound waves generated by point sources A1 and A2 can interfere over a relatively large area without having to bypass the baffle (similar to the case without baffles), far-field sound leakage does not increase significantly compared to the case without baffles. Therefore, placing a baffle structure around one of point sources A1 and A2 can significantly increase the volume at the near-field listening position without significantly increasing the volume of far-field sound leakage.

[0230] In some embodiments, the sound-emitting portion 11 may include a transducer and a housing housing the transducer, with at least a portion of the housing positioned at the user's antihelix 105. The side of the housing facing the user's antihelix 105 includes a clamping region that contacts the user's antihelix 105. Because the distance between the sound-emitting portion 11 and the earhook plane in the thickness direction X increases after wear, the sound-emitting portion 11 tends to approach the earhook plane, thereby forming a clamping region when worn. In some embodiments, the orthographic projection of the earhook 12 on a reference plane perpendicular to the thickness direction X (e.g., the YZ plane in FIG. 21 ) partially overlaps with the orthographic projection of the middle or mid-front section of the sound-emitting portion 11 on the same reference plane (as indicated by the shaded portion on the side of the housing facing the user's antihelix 105 in the figure). The overlapping region formed by the orthographic projection of the earhook 12 on the aforementioned reference plane and the orthographic projection of the free end FE on the same reference plane is located on the side facing the user's antihelix 105. In this way, not only can the sound-emitting portion 11 and the ear hook 12 jointly clamp the ear 100 from the side of the ear 100 facing away from the head to the side of the ear 100 facing the head, but the clamping force generated is primarily compressive stress, which helps improve the stability and comfort of the acoustic device 10 when worn. It should be noted that the clamping area mentioned above refers to the area that clamps the antihelix 105. However, due to individual differences between users, the ear 100 may have different shapes, sizes, and other dimensional differences. In actual wear, this clamping area does not necessarily clamp the antihelix 105.

[0231] In some embodiments, the angle between the direction of the clamping force and the user's sagittal plane needs to be kept within a certain range. For example, the direction of the clamping force can be perpendicular or substantially perpendicular to the user's sagittal plane. If the aforementioned angle deviates too much from 90°, it will result in the inability to form a baffle structure between the sound outlet and the pressure relief hole (for example, one side of the shell where the pressure relief hole is located is tilted, and the antihelix 105 cannot block the pressure relief hole to the other side of the sound outlet), the volume at the near-field listening position cannot be increased, and the free end FE or the battery compartment puts pressure on the ear 100. It should be noted that the direction of the clamping force can be obtained by attaching patches (i.e., force sensors) or patch arrays to both the side of the auricle facing the head and the side of the auricle facing away from the head, and reading the force distribution at the clamped position of the auricle. For example, if there is a point where force can be measured on each side of the auricle facing the head and the side of the auricle facing away from the head, the direction of the clamping force can be considered to be the direction of the line connecting the two points. In some embodiments, in order to meet wearing requirements, the angle between the direction of the clamping force and the user's sagittal plane can be in the range of 60°-120°. In some embodiments, to increase the volume at a near-field listening position, the angle between the direction of the clamping force and the user's sagittal plane can be in the range of 80°-100°. In some embodiments, to further ensure that the earphones fit the antihelix 105 better when worn, the angle between the direction of the clamping force and the user's sagittal plane can be in the range of 70°-90°.

[0232] In some embodiments, when worn, the housing and the first portion of the earhook clamp the user's auricle, and the clamping force provided to the user's auricle needs to be maintained within a certain range. It should be noted that this clamping force can be measured using a tension gauge. For example, when the housing of the sound-emitting portion 11 is pulled apart from the earhook 12 by a predetermined distance in the non-worn state, the pulling force at this time is equivalent to the clamping force. This clamping force can also be achieved by fixing a patch to the wearer's ear. If the clamping force is too small, a baffle structure cannot be formed between the sound outlet and the pressure relief hole (for example, if the sound-emitting portion 11 is loose, the antihelix 105 cannot block the pressure relief hole to the other side of the sound outlet, which is equivalent to the reduced height of the baffle in Figure 22). This will not increase the volume at the near-field listening position and will result in poor wearing stability of the earphone 10. If the clamping force is too large, it will cause a significant pressure on the ear 100, making the adjustability of the earphone 10 poor after wearing. In some embodiments, to meet wearing requirements, when worn, the housing and the first portion of the ear hook 12 clamp the user's auricle and provide a clamping force of 0.03N-3N to the user's auricle. In some embodiments, to increase adjustability after wearing, when worn, the housing and the first portion of the ear hook clamp the user's auricle and provide a clamping force of 0.03N-1N to the user's auricle. In some embodiments, to increase the volume at the near-field listening position, when worn, the housing and the first portion of the ear hook clamp the user's auricle and provide a clamping force of 0.4N-0.9N to the user's auricle.

[0233] FIG. 23 is a perspective view of a portion of an exemplary acoustic device according to some embodiments of the present application.

[0234] In some embodiments, as shown in FIG23 , the ear hook 12 of the earphone 10 may be composed of a metal wire 121 and a wrapping layer 122. The metal wire 121 plays a supporting and clamping role, and the wrapping layer 122 may be wrapped around the outside of the metal wire 121, making the ear hook 12 softer and better fitting the auricle, thereby improving user comfort.

[0235] The earphone 10 shown in FIG21 is taken as an example to describe the earphone 10 in detail. It should be noted that the structure and corresponding parameters of the earphone 10 in FIG21 can also be applied to earphones of other configurations mentioned above without violating the corresponding acoustic principles.

[0236] In some embodiments, the metal wire 121 may include spring steel, titanium alloy, titanium-nickel alloy, chromium-molybdenum steel, aluminum alloy, copper alloy, or a combination thereof. In some embodiments, the number, shape, length, thickness, diameter, and other parameters of the metal wire 121 may be set based on actual needs (e.g., the diameter of acoustic device components, strength requirements for acoustic device components, etc.). The shape of the metal wire 121 may include any suitable shape, such as a cylinder, a cube, a cuboid, a prism, an elliptical cylinder, etc.

[0237] Figure 24 is a cross-sectional view of an exemplary metal wire according to some embodiments of the present application. As shown in Figure 24, the metal wire 121 can be a flat structure, so that the metal wire 121 has different deformability in various directions. In some embodiments, the cross-sectional shape of the metal wire 121 can include square, rectangular, triangular, polygonal, circular, elliptical, irregular, and the like. As shown in Figure 24 (a), the cross-sectional shape of the metal wire 121 can be a rounded rectangle. As shown in Figure 24 (b), the cross-sectional shape of the metal wire 121 can be an elliptical. In some embodiments, the length of the long side (or major axis, L1) and / or the short side (or minor axis, L2) of the metal wire 121 can be set according to actual needs (for example, the diameter of the acoustic device portion including the metal wire 121). In some embodiments, the ratio of the long side to the short side of the metal wire 121 can be within the range of 1.1:1-2:1. In some embodiments, the ratio of the long side to the short side of the metal wire 121 can be 1.5:1.

[0238] In some embodiments, the metal wire 121 can be formed into a specific shape through processes such as stamping and pre-bending. As an example, the metal wire 121 in the ear hook 12 of the acoustic device can be initially curled (i.e., before being processed). After being straightened, it is then stamped into an arc shape in the short axis direction (as shown in Figure (c) in Figure 24). This allows the metal wire 121 to store a certain amount of internal stress and maintain a straight shape, becoming a "memory wire." When subjected to a small external force, it will return to the curled shape, allowing the ear hook 12 of the acoustic device to fit snugly around the human ear. In some embodiments, the ratio of the arc height of the metal wire 121 (L3 shown in Figure 24) to its long side can be within the range of 0.1-0.4. In some embodiments, the ratio of the arc height of the metal wire 121 to its long side can be within the range of 0.1-0.35. In some embodiments, the ratio of the arc height of the metal wire 121 to its long side can be within the range of 0.15-0.3. In some embodiments, the ratio of the arc height of the metal wire 121 to its long side can be within the range of 0.2-0.35. In some embodiments, the ratio of the arc height of the metal wire 121 to its long side can be within the range of 0.25-0.4. By providing the metal wire 121, the stiffness of the components in the acoustic device along its length direction can be increased, and the effectiveness of the acoustic device (for example, the ear hook 12) in clamping the user's ear 100 can be improved. In addition, after processing, the metal wire 121 in the ear hook 12 can be bent in the length direction of the ear hook 12 and have strong elasticity, thereby further improving the effectiveness of the ear hook 12 in pressing the user's ear 100 or head.

[0239] In some embodiments, the elastic modulus of the metal wire 121 can be obtained according to GB / T 24191-2009 / ISO 12076:2002. In some embodiments, the elastic modulus of the metal wire 121 needs to be maintained within a certain range. When the earphones 10 have a uniform shape and size, if the elastic modulus is too large, the ear hook 12 will not easily deform, making it difficult for the user to adjust the wearing angle of the ear hook 12. When the earphones 10 have a uniform shape and size, if the elastic modulus is too small, the ear hook 12 will be too easy to deform, resulting in it not being able to effectively clamp to the sides of the ear 100 after wearing. In some embodiments, to ensure that the ear hook 12 can effectively clamp to the sides of the ear 100 after wearing, the elastic modulus of the metal wire 121 can be 20 GPa to 50 GPa. In some embodiments, to facilitate adjustment of the ear hook 12, the elastic modulus of the metal wire 121 can be 25 GPa to 43 GPa. In some embodiments, the elastic modulus of the metal wire 121 can also be 30 GPa to 40 GPa.

[0240] In some embodiments, the diameter of the metal wire 121 needs to be maintained within a certain range. It should be noted that when the cross-sectional shape of the metal wire 121 is circular, the diameter of the metal wire 121 is the length of the diameter of the circular cross-sectional shape of the metal wire 121; when the cross-sectional shape of the metal wire 121 is elliptical, the diameter of the metal wire is the length of the major axis of the elliptical cross-sectional shape of the metal wire 121; when the cross-sectional shape of the metal wire 121 is square, rectangular, triangular, polygonal, or irregular, the diameter of the metal wire 121 can be defined as the length of the longest line segment of the line segment whose two endpoints are on the cross-sectional shape of the metal wire 121 and passes through the center of the cross-sectional shape of the metal wire 121.

[0241] In some embodiments, the diameter of the metal wire 121 needs to be kept within a certain range. When the material of the metal wire 121 and the shape and size of the earphone 10 are consistent, if the aforementioned diameter is too large, the ear hook 12 will be too heavy and produce a sense of pressure on the ear 100, and the strength of the ear hook 12 will be too large, the ear hook 12 will not be easily deformed, and it will be difficult for the user to adjust the wearing angle of the ear hook 12. When the material of the metal wire 121 and the shape and size of the earphone 10 are consistent, if the aforementioned diameter is too small, the strength of the ear hook 12 will be too low, and the clamping force will be too weak, and it will not be able to effectively clamp on both sides of the ear 100 after wearing. In some embodiments, in order to prevent the ear hook 12 from producing a sense of pressure on the ear 100 after wearing and to facilitate the adjustment of the wearing angle, the diameter of the metal wire 121 can be 0.5mm-1mm. In some embodiments, in order to increase the strength of the ear hook 12, the diameter of the metal wire 121 can be 0.6mm-1mm. In some embodiments, in order to enable the ear hook 12 to be effectively clamped on both sides of the ear 100 after being worn, the diameter of the metal wire 121 can be 0.7 mm-0.9 mm.

[0242] In some embodiments, the density of the metal wire 121 needs to be kept within a certain range. If the density is too high, the ear hook 12 will be too heavy, causing a sense of pressure on the ear 100. If the density is too low, the ear hook 12 will be too weak, easily damaged, and have a short lifespan. In some embodiments, in order to prevent the ear hook 12 from causing a sense of pressure on the ear 100 after being worn, the density of the metal wire 121 can be 5g / cm 3 -7g / cm 3 In some embodiments, in order to increase the strength of the ear hook 12, the density of the metal wire 121 can be 5.5g / cm 3 -6.8g / cm 3 In some embodiments, the density of the metal wire 121 may be 5.8 g / cm 3 -6.5g / cm 3 .

[0243] In some embodiments, the wrapping layer 122 may be made of a relatively soft material, a relatively hard material, or a combination thereof. A relatively soft material refers to a material having a hardness (e.g., Shore hardness) less than a first hardness threshold (e.g., 15A, 20A, 30A, 35A, 40A, etc.). For example, the Shore hardness of the relatively soft material may be 45-85A, 30-60D. A relatively hard material refers to a material having a hardness (e.g., Shore hardness) greater than a second hardness threshold (e.g., 65D, 70D, 75D, 80D, etc.). Materials with a softer texture may include polyurethanes (PU) (e.g., thermoplastic polyurethanes (TPU)), polycarbonate (PC), polyamides (PA), acrylonitrile butadiene styrene (ABS), polystyrene (PS), high impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyurethanes (PU), polyethylene (PE), phenolic resin (PF), urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF), silicone, etc. or a combination thereof. Materials with a harder texture may include polyethersulfones (PES), polyvinylidenechloride (PVDC), polymethylmethacrylate (PMMA), polyetheretherketone (PEEK), etc. or a combination thereof, or a mixture thereof with reinforcing agents such as glass fiber and carbon fiber. In some embodiments, the setting of the wrapping layer 122 can be selected according to the specific situation. For example, the metal wire 121 can be directly coated with a material with a softer texture. For another example, the metal wire 121 can be first coated with a material with a harder texture, and the harder material can then be coated with a material with a softer texture. For another example, in the wearing state, the part of the ear hook 12 that contacts the user is made of a material with a softer texture, and the rest is made of a material with a harder texture.In some embodiments, different materials can be molded using processes such as two-color injection molding and spray-on tactile paint. The tactile paint can include rubber tactile paint, elastic tactile paint, plastic elastic tactile paint, or a combination thereof. In this embodiment, softer materials can improve the comfort of the user wearing the ear hook 12, while harder materials can increase the strength of the ear hook 12. By properly configuring the materials of the various parts of the ear hook 12, the strength of the ear hook 12 can be increased while improving user comfort.

[0244] In some embodiments, the Shore hardness of the wrapping layer 122 needs to be maintained within a certain range. If the Shore hardness is too high, the user will feel less comfortable wearing the ear hook 12. In some embodiments, to increase the user's comfort when wearing the ear hook 12, the Shore hardness of the wrapping layer 122 may be in the range of 10HA-80HA. In some embodiments, the Shore hardness of the wrapping layer 122 may be in the range of 15HA-70HA. In some embodiments, the Shore hardness of the wrapping layer 122 may be in the range of 25HA-55HA. In some embodiments, the Shore hardness of the wrapping layer 122 may be in the range of 30HA-50HA.

[0245] While the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure is merely illustrative and does not limit this specification. Although not explicitly stated herein, various modifications, improvements, and revisions to this specification may be made by those skilled in the art. Such modifications, improvements, and revisions are suggested in this specification and remain within the spirit and scope of the exemplary embodiments of this specification.

[0246] This specification also uses specific terms to describe the embodiments of this specification. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "one embodiment," "an embodiment," or "an alternative embodiment" two or more times in different locations in this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of this specification may be appropriately combined.

[0247] In addition, unless expressly stated in the claims, the order of the processing elements and sequences, the use of alphanumeric characters, or the use of other names described in this specification are not intended to limit the order of the processes and methods of this specification. Although the above disclosure discusses some of the invention embodiments currently considered useful through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the spirit and scope of the embodiments of this specification. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0248] Similarly, it should be noted that, in order to simplify the presentation of this specification and thus facilitate understanding of one or more embodiments of the invention, the foregoing descriptions of the embodiments of this specification sometimes combine multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not imply that the subject matter of this specification requires more features than those recited in the claims. In fact, an embodiment may have fewer features than all of the features of a single disclosed embodiment.

[0249] In some embodiments, numbers are used to describe the quantity of components and attributes. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the description and claims are approximate values, which may change according to the required characteristics of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of this specification are approximate values, in specific embodiments, the settings of such numerical values ​​are as accurate as possible within the feasible range.

[0250] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, and documents, cited in this specification is hereby incorporated by reference in its entirety. This includes application history documents that are inconsistent with or conflict with the content of this specification, as well as documents (currently or subsequently attached to this specification) that limit the broadest scope of the claims of this specification. It should be noted that if the descriptions, definitions, and / or terminology used in the accompanying materials are inconsistent or conflicting with the content of this specification, the descriptions, definitions, and / or terminology used in this specification will control.

[0251] Finally, it should be understood that the embodiments described in this specification are intended only to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly described and illustrated in this specification.

Claims

1. A headset, characterized in that: include: a sound-emitting portion, comprising a transducer and a housing for accommodating the transducer; The ear hook comprises a first part and a second part connected in sequence. When worn, the first part is hung between the user's auricle and the head, and the second part extends to the side of the auricle away from the head and connects to the sound-emitting part. The sound-emitting part is worn near the ear canal but does not block the ear canal opening. The inner contour of the projection of the ear hook on the sagittal plane of the user includes a first curve, the first curve has an extreme point in a first direction, and the first direction is perpendicular to the long axis direction of the projection of the sound-producing part; The extreme point is located behind the projection point of the ear hook upper vertex on the user's sagittal plane, and the ear hook upper vertex is the highest point of the inner contour of the ear hook along the vertical axis of the user in the wearing state; The shell and the first portion of the ear hook clamp the user's auricle and provide a clamping force of 0.03N-1N to the user's auricle.

2. The earphone according to claim 1, wherein The distance between the extreme point and the projection point of the apex of the ear hook on the sagittal plane of the user is between 6 mm and 15 mm.

3. The earphone according to any one of claims 1-2, characterized in that: In the wearing state, the angle between the direction of the clamping force and the sagittal plane of the user is within the range of -30° to 30°.

4. The earphone according to any one of claims 1 to 3, characterized in that: The ear hook includes a clamping fulcrum, which is located at a corresponding point of the extreme point on the ear hook. The clamping coefficient of the ear hook based on the clamping fulcrum ranges from 10 N / m to 30 N / m.

5. The earphone according to claim 4, characterized in that The ear hook has a variable cross-section structure, and the cross-section area of ​​the ear hook is the smallest at the point corresponding to the extreme point on the ear hook.

6. The earphone according to claim 5, characterized in that The area range of the smallest cross-section of the ear hook is 5mm 2 -9mm 2 .

7. The earphone according to any one of claims 1 to 6, characterized in that: The sound-emitting portion includes a clamping area, the clamping area includes a center of the clamping area, the first part of the ear hook includes an ear hook clamping point, and the ear hook clamping point is the point on the ear hook closest to the center of the clamping area.

8. The earphone according to claim 7, wherein: In the wearing state, the distance between the projection point of the clamping area center on the user's sagittal plane and the projection point of the ear hook clamping point on the user's sagittal plane is not less than 2 mm.

9. The earphone according to any one of claims 7-8, characterized in that: In the wearing state, the distance between the projection point of the center of the clamping area on the sagittal plane of the user and the extreme point is in the range of 20 mm to 40 mm.

10. The earphone according to claim 9, characterized in that In the wearing state, the distance between the projection point of the center of the clamping area on the sagittal plane of the user and the projection point of the upper vertex on the sagittal plane of the user is in the range of 25 mm to 40 mm.

11. The earphone according to claim 10, characterized in that In the wearing state, the difference between the distance from the projection point of the center of the clamping area on the sagittal plane of the user to the extreme point and the distance from the projection point of the center of the clamping area on the sagittal plane of the user to the projection point of the upper vertex on the sagittal plane of the user is in the range of 2mm-6mm.

12. The earphone according to any one of claims 7-8, characterized in that: In the wearing state, the distance between the projection point of the ear hook clamping point on the user's sagittal plane and the extreme point is in the range of 25 mm to 45 mm.

13. The earphone according to claim 12, wherein: In the wearing state, the distance between the projection point of the ear hook clamping point on the user's sagittal plane and the projection point of the upper vertex on the user's sagittal plane is in the range of 28 mm to 48 mm.

14. The earphone according to claim 13, wherein In the wearing state, the difference between the distance from the projection point of the ear hook clamping point on the user's sagittal plane to the extreme point and the distance from the projection point of the ear hook clamping point on the user's sagittal plane to the projection point of the upper vertex on the user's sagittal plane is in the range of 1mm-5mm.

15. The earphone according to any one of claims 7-8, characterized in that: In the wearing state, the angle between the first line from the projection point of the clamping area center on the user's sagittal plane to the extreme point and the second line from the projection point of the ear hook clamping point on the user's sagittal plane to the extreme point is in the range of 6°-12°.

16. The earphone according to claim 7, wherein In the non-wearing state, the distance between the center of the clamping area and the ear hook clamping point is within a range of no more than 3 mm.

17. The earphone according to any one of claims 7 or 16, characterized in that In the non-wearing state, the distance between the center of the clamping area and the corresponding point of the extreme point on the ear hook ranges from 20 mm to 35 mm.

18. The earphone according to claim 17, wherein In the non-wearing state, the distance between the center of the clamping area and the upper vertex ranges from 25 mm to 40 mm.

19. The earphone according to claim 18, wherein In the non-wearing state, the difference between the distance from the center of the clamping area to the corresponding point of the extreme point on the ear hook and the distance from the center of the clamping area to the upper vertex is in the range of 2 mm to 6 mm.

20. The earphone according to any one of claims 7 or 16, characterized in that In the non-wearing state, the distance between the ear hook clamping point and the corresponding point of the extreme point on the ear hook ranges from 25mm to 45mm.

21. The earphone according to claim 20, wherein In the non-wearing state, the distance between the ear hook clamping point and the upper vertex ranges from 25mm to 45mm.

22. The earphone according to claim 21, wherein In the non-wearing state, the difference between the distance from the ear hook clamping point to the corresponding point of the extreme point on the ear hook and the distance from the ear hook clamping point to the upper vertex is in the range of 0.01 mm to 0.1 mm.

23. The earphone according to any one of claims 7 or 16, characterized in that In the non-wearing state, the angle between the first line from the center of the clamping area to the corresponding point of the extreme point on the ear hook and the second line from the ear hook clamping point to the corresponding point of the extreme point on the ear hook is in the range of 3°-9°.

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