Open-back earphones

Abstract

An embodiment of the present specification provides an open-type earphone, the open-type earphone including an ear hook including a sound generating unit and a first part and a second part connected in sequence, the first part being hung between a user's auricle and head, the second part extending toward an anterior outer surface of the auricle and connected to the sound generating unit, thereby attaching the sound generating unit near an ear canal at a position that does not block the ear canal opening, the sound generating unit and the auricle each have a first projection and a second projection on a sagittal plane, the centroid of the first projection has a first distance in a vertical axis direction relative to a highest point of the second projection, the ratio of the first distance to a height of the second projection in the vertical axis direction is 0.25 to 0.6, the centroid of the first projection has a second distance in a sagittal axis direction relative to a rear end point of the second projection, and the ratio of the second distance to a width of the second projection in the sagittal axis direction is 0.4 to 0.7.

Description

[Technical Field]

[0001] The present application relates to the technical field of acoustics, and in particular to open-type earphones.

[0002] [Incorporated by reference] This application claims priority to a Chinese application with application number 202211336918.4 filed on October 28, 2022, priority to a Chinese application with application number 202223239628.6 filed on December 1, 2022, and priority to a PCT application with application number PCT / CN2022 / 144339 filed on December 30, 2022, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] With the development of audio output technology, audio devices (e.g., earphones) have been widely applied in people's daily lives and can be used in combination with electronic devices such as mobile phones and computers to provide users with an auditory feast. Depending on the way the user wears the audio device, it can usually be divided into head-mounted, ear-hook, in-ear, etc.

[0004] Therefore, there is a need to provide an open-type earphone that can improve the user's wearing comfort and has excellent output performance. Summary of the Invention [Means for solving the problem]

[0005] An open-type earphone according to one embodiment of the present specification includes an earhook including a sound generating unit and a first part and a second part connected in sequence, the first part being hung between a user's auricle and head, the second part extending toward the anterior lateral surface of the auricle and connected to the sound generating unit, thereby wearing the sound generating unit near an ear canal in a position that does not block the ear canal opening, the sound generating unit and the auricle each having a first projection and a second projection on a sagittal plane, the centroid of the first projection having a first distance in a vertical axis direction from a highest point of the second projection, the ratio of the first distance to a height of the second projection in the vertical axis direction being 0.25 to 0.6, the centroid of the first projection having a second distance in a sagittal axis direction from a rear end point of the second projection, the ratio of the second distance to a width of the second projection in the sagittal axis direction being 0.4 to 0.7.

[0006] An open-type earphone according to one embodiment of the present specification includes an earhook including a sound generating unit and a first part and a second part connected in sequence, the first part being hung between a user's auricle and head, the second part extending toward the anterior outer surface of the auricle and connected to the sound generating unit, so that the sound generating unit is attached near an ear canal in a position that does not block the ear canal opening, and at least a part of the sound generating unit includes an earhook that enters the cavity of the concha, and the sound generating unit and the auricle each have a first angle in a sagittal plane. The present invention has a first projection and a second projection, wherein the centroid of the first projection has a seventh distance in a vertical axis direction from the projection of the highest point of the connection point of the auricle and the head onto the sagittal plane, and the ratio of the seventh distance to the distance between the projections of the highest and lowest points of the connection point of the auricle and the head onto the sagittal plane in the vertical axis direction is 0.4 to 0.65, and the ratio of the distance between the centroid of the first projection and the projection of the posterior end point of the tragus onto the sagittal plane in the sagittal axis direction to the width of the second projection in the sagittal axis direction is 0.4 to 0.65.

[0007] An open-type earphone according to one embodiment of the present specification is an earhook including a sound generating unit and a first part and a second part connected in sequence, wherein the first part is hung between the user's auricle and head, and the second part extends toward the anterior outer surface of the auricle and is connected to the sound generating unit to wear the sound generating unit in a position near the auditory canal without blocking the auditory canal opening, and at least a portion of the sound generating unit includes an earhook that fits into the cavity of the concha, wherein the sound generating unit and the auricle each have a first projection and a second projection onto the sagittal plane, the range of the distance between the centroid of the first projection and the outline of the second projection is 23 mm to 52 mm, and the range of the inclination angle of the projection of the upper wall or lower wall of the sound generating unit onto the sagittal plane with respect to the horizontal is 40° or less.

[0008] An open-type earphone according to one embodiment of the present specification is an earhook including a sound generating unit and a first part and a second part connected in sequence, wherein the first part is hung between the user's auricle and head, and the second part extends toward the anterior lateral surface of the auricle and is connected to the sound generating unit so that the sound generating unit is worn near the auditory canal in a position that does not block the auditory canal opening, and at least a portion of the sound generating unit includes an earhook that fits into the cavity of the concha, wherein the range of the distance between the midpoint of the projection of the upper wall of the sound generating unit onto the sagittal plane and the projection of the highest point of the auricle onto the sagittal plane is 24 mm to 36 mm, and the range of the distance between the midpoint of the projection of the lower wall of the sound generating unit onto the sagittal plane and the projection of the highest point of the auricle onto the sagittal plane is 36 mm to 54 mm.

[0009] An open-type earphone according to one embodiment of the present specification is an earhook including a sound generating unit and a first part and a second part connected in sequence, wherein the first part is hung between the user's auricle and head, and the second part extends toward the anterior lateral surface of the auricle and is connected to the sound generating unit so that the sound generating unit is worn near the auditory canal in a position that does not block the auditory canal opening, and at least a portion of the sound generating unit includes an earhook that fits into the cavity of the concha, wherein the range of the distance between the midpoint of the projection of the upper wall of the sound generating unit onto the sagittal plane and the projection of the apex of the earhook onto the sagittal plane is 21 mm to 32 mm, and the range of the distance between the midpoint of the projection of the lower wall of the sound generating unit onto the sagittal plane and the projection of the apex of the earhook onto the sagittal plane is 32 mm to 48 mm.

[0010] An open-type earphone according to one embodiment of the present specification is an earhook including a sound generating unit and a first part and a second part connected in sequence, wherein the first part is hung between the user's auricle and head, and the second part extends toward the anterior lateral surface of the auricle and is connected to the sound generating unit to wear the sound generating unit in a position near the ear canal without blocking the ear canal opening, and at least a portion of the sound generating unit includes an earhook that covers the antihelix region, the sound generating unit and the auricle each have a first projection and a second projection onto the sagittal plane, the distance between the projection of the centroid of the first projection onto the sagittal plane and the outline of the second projection ranges from 13 mm to 54 mm, and the inclination angle of the projection of the upper wall or lower wall of the sound generating unit onto the sagittal plane with respect to the horizontal direction ranges from 40° or less.

[0011] An open-type earphone according to one embodiment of the present specification is an earhook including a sound generating unit and a first part and a second part connected in sequence, wherein the first part is hung between the user's auricle and head, and the second part extends toward the anterior lateral surface of the auricle and is connected to the sound generating unit to wear the sound generating unit in a position near the ear canal without blocking the ear canal opening, and at least a portion of the sound generating unit includes an earhook that covers the antihelix region, wherein the range of the distance between the midpoint of the projection of the upper wall of the sound generating unit onto the sagittal plane and the projection of the highest point of the auricle onto the sagittal plane is 12 mm to 24 mm, and the range of the distance between the midpoint of the projection of the lower wall of the sound generating unit onto the sagittal plane and the projection of the highest point of the auricle onto the sagittal plane is 22 mm to 34 mm.

[0012] An open-type earphone according to one embodiment of the present specification is an earhook including a sound generating unit and a first part and a second part connected in sequence, wherein the first part is hung between the user's auricle and head, and the second part extends toward the anterior surface of the auricle and is connected to the sound generating unit, thereby wearing the sound generating unit near the ear canal in a position that does not block the ear canal opening, and at least a portion of the sound generating unit includes an earhook that covers the antihelix region, and the range of the distance between the midpoint of the projection of the upper wall of the sound generating unit onto the sagittal plane and the projection of the apex of the earhook onto the sagittal plane is 13 mm to 20 mm, and the range of the distance between the midpoint of the projection of the lower wall of the sound generating unit onto the sagittal plane and the projection of the apex of the earhook onto the sagittal plane is 22 mm to 36 mm.

[0013] The present application will be further illustrated by exemplary embodiments, which are not limiting and will be described in detail with reference to the drawings, in which like numbers refer to like structures. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic diagram of an exemplary ear according to some embodiments herein. [Figure 2]1 is an exemplary schematic view of an open-type earphone according to some embodiments of the present disclosure; FIG. [Figure 3] 1 is a schematic view of an open-type earphone according to some embodiments of the present specification, in which the sound generating unit is inserted into the cavity of the concha. FIG. [Figure 4] FIG. 1 is a schematic diagram of an acoustic model of a similar cavity structure according to some embodiments herein. [Figure 5A] 1 is an exemplary schematic view of an open-type earphone according to some embodiments of the present disclosure; FIG. [Figure 5B] 1 is an exemplary schematic view of an open-type earphone according to some embodiments of the present disclosure; FIG. [Figure 6] 1 is a schematic diagram of a similar cavity structure according to some embodiments herein. [Figure 7] 10A-10C are listening index curve diagrams of similar cavity structures with different sized leakage structures, in accordance with some embodiments herein. [Figure 8] 1 is an exemplary schematic view of an open-type earphone according to some embodiments of the present disclosure; FIG. [Figure 9] 1 is an exemplary schematic view of an open-type earphone according to some embodiments of the present disclosure; FIG. [Figure 10A] FIG. 1 is an exemplary schematic diagram of an open-type earphone according to some embodiments of the present disclosure. [Figure 10B] FIG. 1 is a schematic diagram of a user wearing open earphones, in accordance with some embodiments of the present disclosure. [Figure 11] 10A and 10B are schematic diagrams illustrating exemplary wearing of open-type earphones in accordance with some other embodiments of the present disclosure. [Figure 12] 10A and 10B are schematic diagrams illustrating exemplary wearing of open-type earphones in accordance with some other embodiments of the present disclosure. [Figure 13A] 1A-1C are schematic diagrams of exemplary engagement positions of an open-type earbud and a user's ear canal in accordance with some embodiments of the present disclosure. [Figure 13B] 1 is a schematic diagram of an exemplary engagement position of another open-type earbud with a user's ear canal in accordance with some embodiments of the present disclosure. [Figure 13C] 10A-10C are schematic diagrams of exemplary engagement positions of yet another open-type earbud with a user's ear canal, according to some embodiments herein. [Figure 14A] 10A and 10B are schematic diagrams illustrating exemplary wearing of open-type earphones in accordance with some other embodiments of the present disclosure. [Figure 14B] FIG. 1 is a schematic diagram of an open-type earphone according to some embodiments of the present specification in an unworn state. [Figure 15] 10A and 10B are schematic diagrams illustrating exemplary wearing of open-type earphones in accordance with some other embodiments of the present disclosure. [Figure 16] 1 is a schematic diagram illustrating an exemplary wearing of an open-type earphone according to some embodiments of the present disclosure, in which the sound generating unit covers the antihelix region. FIG. [Figure 17] 10A and 10B are schematic diagrams illustrating exemplary wearing of open-type earphones in accordance with some other embodiments of the present disclosure. [Figure 18] 10A and 10B are schematic diagrams illustrating exemplary wearing of open-type earphones in accordance with some other embodiments of the present disclosure. [Figure 19A] 1A-1C are schematic diagrams of different exemplary engagement positions of an open-type earbud in accordance with the present disclosure with a user's ear canal. [Figure 19B] 1A-1C are schematic diagrams of different exemplary engagement positions of another open-type earbud in accordance with the present disclosure with a user's ear canal. [Figure 19C] 10A-10C are schematic diagrams of different exemplary engagement positions of yet another open-type earbud with a user's ear canal in accordance with the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] In order to more clearly describe the technical means of the embodiments of the present application, the drawings necessary for describing the embodiments will be briefly described below. Obviously, the drawings described below are only examples or parts of the embodiments of the present application, and those skilled in the art can apply the present application to other similar scenarios based on these drawings without any creative effort. Unless otherwise clear from the context or described otherwise, the same symbols in the drawings represent the same structures or operations.

[0016] FIG. 1 is a schematic diagram of an exemplary ear portion according to some embodiments of the present disclosure. As shown in FIG. 1, the ear portion 100 may include an external auditory canal 101, a cavity of the concha 102, a navicular 103, a triangular fossa 104, an antihelix 105, a scapha 106, a helix 107, an earlobe 108, a crus of the helix 109, an outer contour 1013, and an inner contour 1014. For ease of explanation, the superior crus of the antihelix 1011, the inferior crus of the antihelix 1012, and the antihelix 105 are collectively referred to as the antihelical region in the embodiments of the present disclosure. In some embodiments, support of an acoustic device by one or more portions of the ear portion 100 allows the acoustic device to be worn stably. In some embodiments, the external auditory canal 101, the concha cavity 102, the concha navicularis 103, and the triangular fossa 104 have certain depths and volumes in three-dimensional space, which can meet the needs of wearing an audio device. For example, an audio device (e.g., an earphone) may be fitted into the external auditory canal 101. In some embodiments, the audio device can be fitted into a portion of the ear unit 100 other than the external auditory canal 101. For example, the audio device can be fitted into a portion of the ear unit 100 other than the external auditory canal 101, such as the concha navicularis 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, the helix 107, or a combination thereof. In some embodiments, the audio device can be fitted into a portion of the user's earlobe 108 to improve comfort and reliability when fitted. By fitting the audio device and transmitting sound into a portion of the ear unit 100 other than the external auditory canal 101, the user's external auditory canal 101 can be "opened up." When a user wears an audio device (open earphone), the audio device does not block the user's ear canal 101, and the user can receive not only sounds from the audio device but also sounds from the environment (e.g., horn sounds, bicycle bell sounds, voices of people around, traffic control calls, etc.), thereby reducing the probability of traffic accidents. In some embodiments, based on the structure of the ear unit 100, the audio device can be designed to have a structure that fits the ear unit 100, so that the audio generating part of the audio device can be worn at different positions on the ear unit.For example, if the acoustic device is an open-type earphone, the open-type earphone may include a suspension structure (e.g., an ear hook) and an audio-generating unit, the audio-generating unit and the suspension structure may be physically connected, and the suspension structure may conform to the shape of the pinna so that the entire or a portion of the audio-generating unit is located in front of the crus helix 109 (e.g., area J surrounded by the dotted line in FIG. 1). Also, for example, when a user wears the open-type earphone, the entire or a portion of the audio-generating unit may contact the upper part of the ear canal 101 (e.g., the location of one or more parts such as the crus helix 109, the navicularis concha 103, the triangular fossa 104, the antihelix 105, the scapha 106, and the helix 107). Also, for example, when a user is wearing open-type earphones, the entire or partial structure of the sound generating unit may be located within a cavity formed by one or more parts of the ear (e.g., the concha scapula 102, the concha navicularis 103, the triangular fossa 104, etc.) (e.g., the area M1 surrounded by dotted lines in Figure 1, which includes at least the concha navicularis 103 and the triangular fossa 104, and the area M2 including at least the concha navicularis 102).

[0017] Because different users may have individual differences, ears may have different shapes, sizes, and other dimensions. For ease of explanation and understanding, unless otherwise specified, this specification mainly uses an ear model having a "standard" shape and dimensions as a reference, and further describes the wearing method of the acoustic device on the ear model in different embodiments. For example, a simulator including a head and its (left and right) ears manufactured in accordance with ANSI: S3.36, S3.25, and IEC: 60318-7 standards, such as GRAS KEMAR, HEAD Acoustics, B&K 4128 series, or B&K 5128 series, can be used as a reference for wearing the acoustic device, representing a scenario in which most users normally wear the acoustic device. Taking GRAS KEMAR as an example, the ear simulator may be any of GRAS 45AC, GRAS 45BC, GRAS 45CC, or GRAS 43AG. Taking HEAD Acoustics as an example, the ear simulator may be any of the HMS II.3, HMS II.3 LN, HMS II.3LN HEC, etc. Note that in the examples herein, the measured data range is based on GRAS 45BC KEMAR. However, because there may be differences between different head models and different ear models, it should be understood that when using other models, there may be a ±10% variation in the relevant data range. By way of example only, the reference ear model may have relevant characteristics such that the vertical axis dimension of the projection of the pinna onto the sagittal plane is within the range of 55 mm to 65 mm, and the sagittal axis dimension of the projection of the pinna onto the sagittal plane is within the range of 45 mm to 55 mm. The projection of the pinna onto the sagittal plane refers to the projection of the edge of the pinna onto the sagittal plane. The edge of the pinna includes at least the outer contour of the helix, the contour of the earlobe, the contour of the tragus, the intertragal notch, the antitragal apex, and the antitragal helical notch. Therefore, in this application, descriptions such as "worn by a user," "in a worn state," and "in a worn state" may refer to the acoustic device described in this application being worn on the ear portion of the simulator.Naturally, taking into consideration the individual differences among different users, the structure, shape, size, thickness, etc. of one or more parts of the ear part 100 can be differentiated to suit ear parts of different shapes and dimensions, and these differentiated designs may be achieved by having characteristic parameters of one or more parts of the audio device (e.g., the sound generating part, ear hook, etc. described below) have different ranges of values ​​to suit different ear parts.

[0018] In fields such as medicine and anatomy, three basic cutting planes of the human body—the sagittal plane, the coronal plane, and the horizontal plane—and three basic axes—the sagittal axis, the coronal axis, and the vertical axis—can be defined. The sagittal plane refers to a cutting plane perpendicular to the ground along the front-to-back direction of the body, dividing the body into two parts, left and right. The coronal plane refers to a cutting plane perpendicular to the ground along the left-to-right direction of the body, dividing the body into two parts, left and right. The horizontal plane refers to a cutting plane parallel to the ground along the up-down direction of the body, dividing the body into two parts, up and down. Accordingly, the sagittal axis refers to an axis perpendicular to the coronal plane along the front-to-back direction of the body, the coronal axis refers to an axis perpendicular to the sagittal plane along the left-to-right direction of the body, and the vertical axis refers to an axis perpendicular to the horizontal plane along the up-down direction of the body. Furthermore, the "front side of the ear" as used herein refers to the side of the ear facing the face of the human body along the sagittal axis. By observing the ear of the simulator along the coronal axis of the human body, a schematic diagram of the front profile of the ear can be obtained, as shown in FIG.

[0019] The above description of the ear portion 100 is for illustrative purposes only and is not intended to limit the scope of the present application. Those skilled in the art can make various changes and modifications based on the description of the present application. For example, some structures of the acoustic device may shield a part or all of the ear canal 101. These changes and modifications still fall within the scope of protection of the present application.

[0020] FIG. 2 is an exemplary schematic diagram of an open-type earphone according to some embodiments of the present disclosure. As shown in FIG. 2 , the open-type earphone 10 may include an audio-generating unit 11 and a suspension structure 12. In some embodiments, the open-type earphone 10 may be attached to a user's body (e.g., the head, neck, or upper torso of a human body) by the suspension structure 12. In some embodiments, the suspension structure 12 may be an ear hook, and the audio-generating unit 11 may be connected to one end of the ear hook, which may be configured to have a shape that fits the user's ear. For example, the ear hook may have an arc-shaped structure. In some embodiments, the suspension structure 12 may be a clip structure that fits the user's auricle so that it can be clipped to the user's auricle. In some embodiments, the suspension structure 12 may include, but is not limited to, an ear hook, an elastic band, or the like, to better fit the open-type earphone 10 to the user and prevent it from coming off during use.

[0021] In some embodiments, the sound generating unit 11 may be worn on the user's body, and a speaker may be installed in the sound generating unit 11 to generate sound and input it to the user's ear unit 100. In some embodiments, the open-type earphone 10 may be combined with a product such as glasses, headphones, a head-mounted display, or an AR / VR helmet. In this case, the sound generating unit 11 may be worn near the user's ear unit 100 in a hanging or clamping manner. In some embodiments, the sound generating unit 11 may have a shape such as a ring, an ellipse, a (regular or irregular) polygon, a U-shape, a V-shape, or a semicircle so that it can be directly hung on the user's ear unit 100.

[0022] As shown in FIGS. 1 and 2 , in some embodiments, when a user wears the open-type earphone 10, at least a portion of the sound generating unit 11 may be located in a region J anterior to the tragus of the user's ear 100 or in regions M1 and M2 on the anterior-lateral surface of the pinna, as shown in FIG. 1 . Hereinafter, an exemplary description will be given in relation to different wearing positions (11A, 11B, 11C) of the sound generating unit 11. Note that the anterior-lateral surface of the pinna described in the embodiments herein refers to the side of the pinna facing away from the head along the coronal axis, and accordingly, the posteromedial surface of the pinna refers to the side of the pinna facing the human head along the coronal axis. In some embodiments, the sound generating unit 11A is located on the side of the user's ear 100 facing the face region of the human body along the sagittal axis, i.e., the sound generating unit 11A is located in the face region J of the human body in front of the ear 100. Furthermore, a speaker may be provided in the housing of the sound generating unit 11A, and the housing of the sound generating unit 11A may be provided with at least one sound output hole (not shown in FIG. 2 ), and the sound output hole may be located on a side wall of the housing of the sound generating unit facing or close to the user's ear canal 101, and the speaker can output sound to the user's ear canal 101 through the sound output hole. In some embodiments, the speaker may include a diaphragm, and a cavity in the housing of the sound generating unit 11A is divided into at least a front cavity and a rear cavity by the diaphragm, and the sound output hole is acoustically coupled to the front cavity, and vibration of the diaphragm drives the air in the front cavity to vibrate and generate air-conducted sound, and the air-conducted sound generated in the front cavity is transmitted to the outside through the sound output hole. In some embodiments, the housing of the sound generating unit 11 may further include one or more decompression holes, which may be located on a side wall adjacent to or opposite to the side wall of the housing where the sound emission hole is located, and the decompression holes are acoustically coupled to the rear cavity, and as the diaphragm vibrates, they drive the air in the rear cavity to vibrate and generate air-conducted sound, and the air-conducted sound generated in the rear cavity is transmitted to the outside through the decompression holes.For example, in some embodiments, the speaker in the sound generating unit 11A can output sounds having a phase difference (e.g., opposite phases) through the sound output hole and the decompression hole, and the sound output hole may be located on a side wall of the housing of the sound generating unit 11A facing the user's ear canal 101, and the decompression hole may be located on a side of the housing of the sound generating unit 11 facing away from the user's ear canal 101, in which case the housing acts as a baffle to increase the difference in acoustic distance between the sound output hole and the decompression hole to the ear canal 101, thereby increasing the intensity of the sound in the ear canal 101 and reducing the volume of sound leakage in the far field. In some embodiments, the sound generating unit 11 may have a major axis direction Y and a minor axis direction Z that are perpendicular to the thickness direction X and are orthogonal to each other. The long axis direction Y can be defined as the direction in which the extension dimension is greatest in the shape of a two-dimensional projection surface of the sound generating unit 11 (for example, a projection of the sound generating unit 11 onto a plane on which its outer surface is located, or a projection onto the sagittal plane) (for example, if the projection shape is rectangular or approximately rectangular, the long axis direction is the length direction of the rectangle or approximately rectangle), and the short axis direction Z can be defined as the direction perpendicular to the long axis direction Y in the projection shape of the sound generating unit 11 onto the sagittal plane (for example, if the projection shape is rectangular or approximately rectangular, the short axis direction is the width direction of the rectangle or approximately rectangle). The thickness direction X can be defined as the direction perpendicular to the two-dimensional projection surface, and for example, coincides with the direction of the coronal axis, both of which face the left-right direction of the body. In some embodiments, when the sound-generating unit 11 is in an inclined state while worn, the major axis direction Y and the minor axis direction Z are still parallel or approximately parallel to the sagittal plane, and the major axis direction Y may form a certain angle with the sagittal axis, i.e., the major axis direction Y is also inclined, and the minor axis direction Z may form a certain angle with the vertical axis, i.e., the minor axis direction Z is also inclined, as in the worn state of the sound-generating unit 11B shown in FIG. 2 . In some embodiments, the entire or part of the structure of the sound-generating unit 11B may extend into the cavity of the concha, i.e., the projection of the sound-generating unit 11B onto the sagittal plane and the projection of the cavity of the concha onto the sagittal plane overlap. For specific details regarding the sound-generating unit 11B, please refer to other parts of this specification, such as FIG. 3 and the corresponding specification.In some embodiments, when worn, the sound generating unit 11 may be in a horizontal or substantially horizontal position. As shown in FIG. 2 , the long axis direction Y may coincide with or substantially coincide with the sagittal axis, both of which point in the front-to-back direction of the body, and the short axis direction Z may coincide with or substantially coincide with the vertical axis, both of which point in the up-and-down direction of the body. Note that when worn, the sound generating unit 11C being in a substantially horizontal position may refer to the angle between the long axis direction Y of the sound generating unit 11C shown in FIG. 2 and the sagittal axis being within a specific range (e.g., 20° or less). Furthermore, the wearing position of the sound generating unit 11 is not limited to the sound generating units 11A, 11B, and 11C shown in FIG. 2 , but may be within the range of region J, region M1, or region M2 shown in FIG. 1 . For example, the entire or partial structure of the sound generating unit 11 may be located in region J surrounded by a dotted line in FIG. 1 . Furthermore, for example, the entire or partial structure of the sound generating unit may be in contact with one or more parts of the ear 100, such as the crus helicalis 109, the concha scapha 103, the triangular fossa 104, the antihelix 105, the scapha 106, and the helix 107. Furthermore, for example, the entire or partial structure of the sound generating unit 11 may be located within a cavity formed by one or more parts of the ear 100 (e.g., the cavity of the concha 102, the concha scapha 103, the triangular fossa 104, etc.) (e.g., region M1, surrounded by dotted lines in Figure 1, including at least the concha scapha 103 and the triangular fossa 104, and region M2, including at least the cavity of the concha 102).

[0023] To improve the stability of the open-type earphone 10 when worn, the open-type earphone 10 can use any one of the following methods or a combination thereof. In method 1, at least a portion of the suspension structure 12 is installed in an elastic structure that fits to at least one of the posterior inner surface of the pinna and the head to increase the contact area between the suspension structure 12 and the ear and / or head, thereby increasing the resistance to the open-type earphone 10 being removed from the ear. In method 2, at least a portion of the suspension structure 12 is installed in an elastic structure so that it has a certain amount of deformation when worn, thereby increasing the positive pressure of the suspension structure 12 on the ear and / or head, thereby increasing the resistance to the open-type earphone 10 being removed from the ear. In Type 3, the suspension structure 12 is installed so that at least a portion thereof abuts against the ear and / or head when worn, generating a reaction force that presses against the ear, and presses the sound generating unit 11 against the anterior lateral surface of the pinna (e.g., areas M1 and M2 shown in FIG. 1 ), thereby increasing the resistance to the open-type earphone 10 being removed from the ear. In Type 4, the sound generating unit 11 and suspension structure 12 are installed so that they sandwich the area of ​​the antihelicalis and the area where the cavity of the concha is located from both the anterior lateral surface and the posterior medial surface of the pinna when worn, thereby increasing the resistance to the open-type earphone 10 being removed from the ear. In Type 5, the sound generating unit 11 or a structure connected thereto is installed so that at least a portion thereof enters cavities such as the cavity of the concha 102, the navicularis concha 103, the triangular fossa 104, and the scapha 106, thereby increasing the resistance to the open-type earphone 10 being removed from the ear.

[0024] 3, when the earphone is worn, the end FE (also called the free end) of the sound generating unit 11 may enter the cavity of the concha. Preferably, the sound generating unit 11 and the suspension structure 12 may clamp the ear region corresponding to the cavity of the concha from both the front and rear of the ear region, thereby increasing the resistance to the open-type earphone 10 being removed from the ear and improving the stability of the open-type earphone 10 when worn. For example, the end FE of the sound generating unit is pressed into the cavity of the concha in the thickness direction X. Also, for example, the end FE abuts against the cavity of the concha in the long axis direction Y and / or the short axis direction Z (for example, abuts against the inner wall of the cavity of the concha that faces the end FE). The end FE of the sound generating unit 11 refers to the end of the sound generating unit 11 that is installed opposite the fixed end connected to the suspension structure 12, and is also called the free end. The sound generating unit 11 may have a regular structure or an irregular structure, and will be described here as an example to further explain the end FE of the sound generating unit 11. For example, if the sound generating unit 11 has a rectangular parallelepiped structure, the end wall surface of the sound generating unit 11 is a plane, and in this case, the end FE of the sound generating unit 11 is an end side wall installed opposite the fixed end of the sound generating unit 11 connected to the hanging structure 12. Furthermore, for example, if the sound generating unit 11 is a sphere, an ellipsoid, or an irregular structure, the end FE of the sound generating unit 11 may refer to a specific region away from the fixed end obtained by cutting the sound generating unit 11 along the YZ plane (a plane formed by the minor axis direction Z and the thickness direction X), and the ratio of the dimension of the specific region along the major axis direction Y to the dimension of the sound generating unit along the major axis direction Y may be 0.05 to 0.2.

[0025] By having at least a portion of the sound-generating unit 11 enter the cavity of the concha, it is possible to increase the listening volume at the listening position (e.g., the opening of the ear canal), particularly the listening volume for mid-low frequencies, while still maintaining an excellent effect of canceling sound leakage in the far field. Simply by way of illustrative example, when the entire or partial structure of the sound-generating unit 11 enters the cavity of the concha 102, the sound-generating unit 11 and the cavity of the concha 102 form a structure similar to a cavity (hereinafter abbreviated as a "similar cavity structure"). In the embodiments of the specification, the "similar cavity structure" may be understood as a semi-enclosed structure surrounded by the side walls of the sound-generating unit 11 and the cavity of the concha 102 structure, and this semi-enclosed structure does not completely seal the listening position (e.g., the opening of the ear canal) and isolate it from the external environment, but has a leaking structure (e.g., an opening, a gap, a tube, etc.) that acoustically communicates with the external environment. When a user wears the open-type earphone 10, one or more sound emission holes may be provided on the side of the housing of the sound-generating unit 11 that is close to or facing the user's ear canal, and one or more decompression holes may be provided on another side wall of the housing of the sound-generating unit 11 (for example, the side wall that is away from or facing away from the user's ear canal), and the sound emission holes are acoustically coupled to the front cavity of the open-type earphone 10, and the decompression holes are acoustically coupled to the rear cavity of the open-type earphone 10. For example, if the sound generating unit 11 includes one sound output hole and one decompression hole, the sound output from the sound output hole and the sound output from the decompression hole can be considered as two sound sources. These two sound sources have opposite phases and form a dipole. The sound generating unit 11 and the inner wall corresponding to the cavity of the concha 102 form a similar cavity structure. The sound source corresponding to the sound output hole is located within the similar cavity structure, and the sound source corresponding to the decompression hole is located outside the similar cavity structure, forming the acoustic model shown in FIG. 4. As shown in FIG. 4, the similar cavity structure 402 may include a listening position and at least one sound source 401A. Here, "including" may indicate that at least one of the listening position and the sound source 401A is located inside the similar cavity structure 402, or that at least one of the listening position and the sound source 401A is located at the edge of the interior of the similar cavity structure 402.The listening position may be equivalent to the ear canal opening, an acoustic reference point of the ear, such as the ERP or DRP, or an entrance structure that guides the listener. Sound source 401B is located outside of the analogous cavity structure 402, and opposite-phase sound sources 401A and 401B form a dipole. The dipoles each radiate sound into the surrounding space, causing sound wave interference cancellation and achieving a sound leakage cancellation effect. Because the difference in acoustic distance between the two sounds is large at the listening position, the sound cancellation effect is not significant, and the sound heard at the listening position is louder than at other positions. Specifically, because sound source 401A is surrounded by the analogous cavity structure 402, most of the radiated sound reaches the listening position via direct or reflected radiation. In contrast, without the analogous cavity structure 402, most of the sound radiated from sound source 401A would not reach the listening position. Therefore, installing the analogous cavity structure 402 significantly increases the volume of sound reaching the listening position. Furthermore, only a small portion of the anti-phase sound radiated from the anti-phase sound source 401B outside the analogous cavity structure 402 enters the analogous cavity structure 402 through the leaking structure 403 of the analogous cavity structure 402. This corresponds to the generation of a secondary sound source 401B' in the leaking structure 403, and the intensity of the secondary sound source 401B' is significantly lower than that of the sound source 401B and also significantly lower than that of the sound source 401A. The sound generated by the secondary sound source 401B' has a weak effect of canceling out the sound generated from the sound source 401A inside the cavity, which can significantly increase the listening volume at the listening position. Regarding sound leakage, the sound source 401A radiating sound to the outside through the cavity leakage structure 403 is equivalent to the generation of a secondary sound source 401A' in the leakage structure 403, and since most of the sound radiated from the sound source 401A is output from the leakage structure 403 and the scale of the similar cavity structure 402 is much smaller (at least one order of magnitude smaller) than the spatial scale for evaluating sound leakage, it is considered that the intensity of the secondary sound source 401A' corresponds to the intensity of the sound source 401A. The canceling effect of the sounds generated by the secondary sound source 401A' and the sound source 401B in the external space corresponds to the canceling effect of the sounds generated by the sound sources 401A and 401B.That is, the similar cavity structure still maintains a certain degree of sound leakage reduction effect.

[0026] In a specific application scenario, the outer wall surface of the housing of the sound generating unit 11 is usually flat or curved, and the contour of the user's concha has an uneven structure. A part or the entire structure of the sound generating unit 11 enters the concha, thereby forming a similar cavity structure that communicates with the outside between the sound generating unit 11 and the contour of the concha. Furthermore, by locating sound emission holes on the housing of the sound generating unit toward the opening of the user's ear canal and close to the edge of the concha, and locating pressure reduction holes on the sound generating unit 11 at a position facing away from the opening of the ear canal or away from the opening of the ear canal, the acoustic model shown in Figure 4 can be constructed, which allows the listening volume at the opening of the ear canal to be increased and sound leakage in the far field to be reduced when the user is wearing open-type earphones.

[0027] 5A and 5B are exemplary schematic views of an open-type earphone according to some embodiments of the present disclosure.

[0028] In some embodiments, the sound generating unit of the open-type earphone may include a transducer and a housing for accommodating the transducer. The transducer is an element that can receive an electrical signal, convert it into an audio signal, and output it. In some embodiments, when distinguished according to frequency, the types of transducers may include a low-frequency (e.g., 30 Hz to 150 Hz) speaker, a mid-low frequency (e.g., 150 Hz to 500 Hz) speaker, a mid-high frequency (e.g., 500 Hz to 5 kHz) speaker, a high frequency (e.g., 5 kHz to 16 kHz) speaker, or a full-frequency (e.g., 30 Hz to 16 kHz) speaker, or any combination thereof. Here, the terms low frequency, high frequency, etc., only represent approximate frequency ranges, and different application scenarios may have different distinction methods. For example, a crossover frequency may be determined, with the low frequency representing the frequency range below the crossover frequency and the high frequency representing the frequency range above the crossover frequency. The crossover frequency may be any value within the audible range of the human ear, such as 500 Hz, 600 Hz, 700 Hz, 800 Hz, 1000 Hz, etc.

[0029] In some embodiments, the transducer may include a single diaphragm. When the diaphragm vibrates, sound is emitted from the front and rear sides of the diaphragm. In some embodiments, a front cavity (not shown) for transmitting sound is provided in the housing 120 at a position in front of the diaphragm. The front cavity may be acoustically coupled to a sound emission hole, and sound from the front side of the diaphragm may pass through the front cavity and be emitted from the sound emission hole. A rear cavity (not shown) for transmitting sound is provided in the housing 120 at a position in back of the diaphragm. The rear cavity may be acoustically coupled to a decompression hole, and sound from the rear side of the diaphragm may pass through the rear cavity and be emitted from the decompression hole.

[0030] As shown in Fig. 3, an example in which the ear hook is a suspension structure 12 will be described here. In some embodiments, the ear hook may include a first part 121 and a second part 122 connected in sequence, where the first part 121 may be hung between the posterior medial surface of the user's pinna and the head, and the second part 122 extends toward the anterior lateral surface of the pinna (the side of the pinna facing away from the head along the coronal axis) and is connected to the sound-generating unit 11, thereby attaching the sound-generating unit 11 near the user's ear canal but not blocking the ear canal opening. In some embodiments, a sound emission hole may be formed in a side wall of the housing of the sound-generating unit 11 facing the pinna, thereby allowing sound generated by the transducer to be guided from the housing and transmitted to the user's ear canal opening.

[0031] As shown in FIGS. 3 and 5A , in some embodiments, when a user wears the open-type earphone 10, the sound-generating unit 11 has a first projection onto the sagittal plane (i.e., the plane formed by the T-axis and the S-axis in FIG. 5A ) along the coronal axis direction R, and the shape of the sound-generating unit 11 may be a regular or irregular three-dimensional shape. Accordingly, the first projection of the sound-generating unit 11 onto the sagittal plane has a regular or irregular shape, for example, when the shape of the sound-generating unit 11 is a rectangular parallelepiped, an approximately rectangular parallelepiped, In the case of a cylindrical body, the first projection of the sound generating unit 11 onto the sagittal plane may be rectangular or approximately rectangular (e.g., racetrack-shaped). Considering that the first projection of the sound generating unit 11 onto the sagittal plane may have an irregular shape, in order to easily explain the first projection, a rectangular area indicated by a solid-line frame P is defined around the projection of the sound generating unit 11 (i.e., the first projection) shown in FIGS. 5A and 5B , and the centroid O of the rectangular area indicated by the solid-line frame P can be considered to be approximately the centroid of the first projection. Note that the above description of the first projection and its centroid is merely an example, and the shape of the first projection is related to the shape of the sound generating unit 11 or the wearing situation of the sound generating unit 11 on the ear. The pinna has a second projection onto the sagittal plane along the direction of the coronal axis R. In order to ensure that at least a portion of the structure of the sound-generating unit 11 enters the cavity of the concha or covers the antihelical region when the open-type earphone 10 is worn, in some embodiments, the ratio of the distance h1 (also referred to as the first distance) between the centroid O of the first projection and the highest point of the second projection in the vertical axis direction (e.g., the T-axis direction shown in FIG. 5A ) to the height h of the second projection in the vertical axis direction may be set to 0.25 to 0.6, and the ratio of the distance w1 (also referred to as the second distance) between the centroid O of the first projection and the rear end point of the second projection in the sagittal axis direction (e.g., the S-axis direction shown in FIG. 5A ) to the width w of the second projection in the sagittal axis direction may be set to 0.4 to 0.7. In some embodiments, the sound-generating unit 11 and the suspension structure 12 may be two independent structures or may be a single-piece structure.To explain the first projection area of ​​the sound generating unit more clearly, here, a thickness direction X, a major axis direction Y, and a minor axis direction Z are introduced based on the three-dimensional structure of the sound generating unit 11, where the major axis direction Y is perpendicular to the minor axis direction Z, and the thickness direction X is perpendicular to the plane formed by the major axis direction Y and the minor axis direction Z. By way of example only, the process of determining the solid-line frame P is to determine the two most distant points in the major axis direction Y of the sound generating unit 11, draw first and second line segments passing through these two points and parallel to the minor axis direction Z, determine the two most distant points in the minor axis direction Z of the sound generating unit 11, draw third and fourth line segments passing through these two points and parallel to the major axis direction Y, and obtain the rectangular area of ​​the solid-line frame P shown in Figures 5A and 5B by the area formed by each of the line segments.

[0032] The highest point of the second projection may be understood as the point at which, among all the projection points, the distance to the projection of a specific point on the user's neck onto the sagittal plane along the vertical axis is the greatest, i.e., the projection of the highest point of the pinna (e.g., point A1 in FIG. 5A ) onto the sagittal plane is the highest point of the second projection. The lowest point of the second projection may be understood as the point at which, among all the projection points, the distance to the projection of a specific point on the user's neck onto the sagittal plane along the vertical axis is the smallest, i.e., the projection of the lowest point of the pinna (e.g., point A2 in FIG. 5A ) onto the sagittal plane is the lowest point of the second projection. The height of the second projection along the vertical axis is the difference (height h in FIG. 5A ) between the point at which the distance to the projection of a specific point on the user's neck onto the sagittal plane along the vertical axis is the greatest and the point at which the distance is the smallest, i.e., the distance between point A1 and point A2 in the direction of the vertical axis T, among all the projection points of the second projection. The posterior end point of the second projection may be understood as the point at which the distance to the projection of the tip of the user's nose onto the sagittal plane in the sagittal axis direction is greatest among all the projection points of the second projection, i.e., the projection of the posterior end point of the pinna (e.g., point B1 shown in FIG. 5A ) onto the sagittal plane is the posterior end point of the second projection. The anterior end point of the second projection may be understood as the point at which the distance to the projection of the tip of the user's nose onto the sagittal plane in the sagittal axis direction is smallest among all the projection points of the second projection, i.e., the projection of the anterior end point of the pinna (e.g., point B2 shown in FIG. 5A ) onto the sagittal plane is the anterior end point of the second projection. The width of the second projection in the sagittal axis direction is the difference between the point at which the distance to the projection of the tip of the nose onto the sagittal plane in the sagittal axis direction is greatest and the point at which the distance is smallest (width w shown in FIG. 5A ) among all the projection points of the second projection, i.e., the distance between point B1 and point B2 in the direction of the sagittal axis S. In the examples of this specification, the projection of structures such as the sound generating unit 11 or the pinna onto the sagittal plane refers to the projection onto the sagittal plane along the direction of the coronal axis R, and this will not be emphasized in the following specification.

[0033] In some embodiments, when the ratio of the distance h1 in the vertical axis direction between the centroid O of the first projection and the highest point of the second projection to the height h of the second projection in the vertical axis direction is 0.25 to 0.6, and the ratio of the distance w1 in the sagittal axis direction between the centroid O of the first projection and the posterior end point of the second projection to the width w of the second projection in the sagittal axis direction is 0.4 to 0.7, a part or the entire structure of the sound generating unit 11 can substantially cover the user's antihelical region (e.g., the position of the triangular fossa, the superior crus of the antihelical, the inferior crus of the antihelical, or the antihelical, the position of the sound generating unit 11C relative to the ear shown in FIG. 2), or the part or the entire structure of the sound generating unit 11 can enter the cavity of the concha (e.g., the position of the sound generating unit 11B relative to the ear shown in FIG. 2). In some embodiments, in order to have all or part of the structure of sound generating unit 11 cover the user's antihelical region (e.g., the position of the triangular fossa, the superior crus of the antihelical region, the inferior crus of the antihelical region, or the position of the antihelical region), for example, the position of sound generating unit 11C relative to the ear shown in FIG. 2 , the ratio of the distance h1 between the centroid O of the first projection and the highest point of the second projection in the vertical axis direction to the height h of the second projection in the vertical axis direction is 0.25 to 0.4, and the ratio of the distance w1 between the centroid O of the first projection and the posterior end point of the second projection in the sagittal axis direction to the width w of the second projection in the sagittal axis direction is 0.4 to 0.6. When all or part of the structure of sound generating unit 11 covers the user's antihelical region, the housing of sound generating unit 11 itself functions as a baffle, increasing the difference in acoustic distance between the sound emission hole and the decompression hole to the ear canal opening, thereby increasing the intensity of sound at the ear canal opening. Furthermore, when worn, the side walls of the sound generating unit 11 abut against the antihelical region, and the uneven structure of the antihelical region can also function as a baffle, which increases the acoustic distance over which sound emitted from the decompression hole is transmitted to the ear canal opening, thereby increasing the difference in acoustic distance between the sound emission hole and the decompression hole to the ear canal opening. Also, when the sound generating unit 11 entirely or partially covers the user's antihelical region, the sound generating unit 11 does not need to enter the user's ear canal opening, thereby ensuring that the ear canal opening is kept sufficiently open, allowing the user to obtain sound information from the external environment and improving the user's comfort when wearing the earphones.For specific details regarding the structure of the entire or part of the sound generating unit 11 substantially covering the antihelix region of the user, please refer to the contents elsewhere in this specification.

[0034] In some embodiments, in order to enable the entire or partial structure of the sound generating unit 11 to enter the cavity of the concha, for example, the position of the sound generating unit 11B relative to the ear shown in FIG. 2, the ratio of the distance h1 in the vertical axis direction between the centroid O of the first projection and the highest point of the second projection to the height h of the second projection in the vertical axis direction may be set to 0.35 to 0.6, and the ratio of the distance w1 in the sagittal axis direction between the centroid O of the first projection and the posterior end point of the second projection to the width w of the second projection in the sagittal axis direction may be set to 0.4 to 0.65. In the open-type earphones according to the embodiments of the present specification, the ratio of the distance h1 between the centroid O of the first projection and the highest point of the second projection in the vertical axis direction when worn by a user to the height h of the second projection in the vertical axis direction is controlled to 0.35 to 0.6, and the ratio of the distance between the centroid O of the first projection and the rear end point of the second projection in the sagittal axis direction to the width of the second projection in the sagittal axis direction is controlled to 0.4 to 0.65, so that at least a portion of the sound generating unit 11 enters the cavity of the concha, and the acoustic model shown in Figure 4 can be formed with the user's cavity of the concha. This increases the listening volume at the listening position (e.g., the ear canal opening) of the open-type earphones, especially the listening volume for mid- and low-frequency sounds, while maintaining an excellent cancellation effect of sound leakage in the far field. Here, when a portion or all of the sound generating unit 11 enters the cavity of the concha, the sound output hole is closer to the ear canal opening, further increasing the listening volume at the ear canal opening. In addition, the cavity of the concha serves to provide a certain level of support and positional constraints for the sound generating unit 11, thereby improving the stability of the open-type earphone when worn.

[0035] To ensure that the user's ear canal is not blocked when wearing the open-type earphones 10, to reduce the burden on the user when wearing the earphones, and to facilitate daily carrying, the area of ​​the first projection of the sound generating unit 11 onto the sagittal plane is typically set much smaller than the area of ​​the projection of the pinna onto the sagittal plane. On this premise, if the ratio of the distance h1 between the centroid O of the projection of the sound generating unit 11 onto the sagittal plane (first projection) and the projection of the highest point A1 of the pinna onto the sagittal plane (highest point of the second projection) in the vertical axis direction, and the height h of the second projection in the vertical axis direction is too small or too large when the earphones are worn, some structure of the sound generating unit 11 may be located above the top of the pinna or on the user's earlobe, preventing the pinna from providing sufficient support and positional restriction for the sound generating unit 11, resulting in unstable wearing and easy removal. Furthermore, the sound emission hole provided in the sound generating unit 11 may be far away from the ear canal, which may affect the listening volume at the user's ear canal. To ensure that the open-type earphones do not block the user's ear canal and to ensure stability, comfort, and a good listening experience when the user wears the open-type earphones, in some embodiments, the ratio of the distance h1 in the vertical axis direction between the centroid O of the first projection and the highest point A1 of the second projection to the height h of the second projection in the vertical axis direction is controlled to be 0.35 to 0.6, so that when a part or the entire structure of the sound generating unit is inserted into the cavity of the concha, the force acting on the sound generating unit 11 by the cavity of the concha provides a certain level of support and positional restriction for the sound generating unit 11, further improving the stability and comfort when worn. Furthermore, the sound generating unit 11 may form an acoustic model with the cavity of the concha as shown in FIG. 4, which ensures the listening volume at the user's listening position (e.g., the ear canal) and reduces the volume of sound leakage in the far field. Preferably, the ratio of the distance h1 in the vertical axis direction between the centroid O of the first projection and the highest point A1 of the second projection to the height h of the second projection in the vertical axis direction is controlled to 0.35 to 0.55. More preferably, the ratio of the distance h1 in the vertical axis direction between the centroid O of the first projection and the highest point of the second projection to the height h of the second projection in the vertical axis direction is controlled to 0.4 to 0.5.

[0036] Similarly, if the ratio of the distance w1 between the centroid O of the first projection and the rear end point of the second projection in the sagittal axis direction to the width w of the second projection in the sagittal axis direction is too large or too small, a part or all of the structure of the sound generating unit 11 may be located in the facial area in front of the ear or may extend beyond the outer contour of the pinna, which also causes the sound generating unit 11 to be unable to establish the acoustic model shown in Fig. 4 with the cavity of the concha and may cause the open-type earphone 10 to be unstable when worn. Based on this, in the open-type earphones according to the embodiments of this specification, by controlling the ratio of the distance w1 between the centroid O of the first projection and the rear end point of the second projection in the sagittal axis direction to the width w of the second projection in the sagittal axis direction to 0.4 to 0.7, the acoustic output effect of the sound generating unit can be guaranteed and the stability and comfort of wearing the open-type earphone can be improved. Preferably, the ratio of the distance w1 between the centroid O of the first projection and the posterior end point of the second projection in the sagittal axis direction to the width w of the second projection in the sagittal axis direction may be 0.45 to 0.68. More preferably, the ratio of the distance w1 between the centroid O of the first projection and the posterior end point of the second projection in the sagittal axis direction to the width w of the second projection in the sagittal axis direction is controlled to be 0.5 to 0.6.

[0037] As a specific example, the height h of the second projection in the vertical axis direction may be 55 mm to 65 mm. When worn, if the distance h1 between the centroid O of the first projection and the highest point of the second projection in the vertical axis direction is less than 15 mm or greater than 50 mm, the sound generating unit 11 will be located far away from the cavity of the concha, which will not only make it impossible to construct the acoustic model shown in Figure 4, but will also cause the problem of unstable wearing. Therefore, in order to ensure the acoustic output effect of the sound generating unit and the stability of the open-type earphones when worn, the distance h1 between the centroid O of the first projection and the highest point of the second projection in the vertical axis direction can be controlled to 15 mm to 50 mm. Similarly, in some embodiments, the width of the second projection in the sagittal axis direction may be 40 mm to 55 mm. If the distance between the centroid O of the first projection and the rear end point of the second projection in the sagittal axis direction is greater than 45 mm or less than 15 mm, the sound generating unit 11 will be too far forward or too far behind the user's ear, which will also cause the sound generating unit 11 to be unable to construct the acoustic model shown in FIG. 4 and will make the open-type earphone 10 unstable when worn. Therefore, in order to ensure the acoustic output effect of the sound generating unit 11 and the stability of the open-type earphone when worn, the distance between the centroid O of the first projection and the rear end point of the second projection in the sagittal axis direction can be controlled to be 15 mm to 45 mm.

[0038] As described above, when a user wears the open-type earphone 10, at least a portion of the sound-generating unit 11 can enter the user's concha cavity, forming the acoustic model shown in FIG. 4. The outer wall surface of the housing of the sound-generating unit 11 is usually flat or curved, and the contour of the user's concha cavity has an uneven structure. When a portion or the entire structure of the sound-generating unit 11 enters the concha cavity, the sound-generating unit 11 cannot fit closely to the concha cavity, forming a gap. This gap corresponds to the leakage structure 403 shown in FIG. 4. FIG. 6 is a schematic diagram of a similar cavity structure according to some embodiments of the present specification. FIG. 7 is a listening index curve diagram of similar cavity structures with different leakage structures according to some embodiments of the present specification. As shown in FIG. 6, the opening area of ​​the leakage structure of the similar cavity structure is S, and the area of ​​the similar cavity structure that is directly affected by the included sound source (e.g., the "+" shown in FIG. 6) is S0. Here, "direct action" refers to the sound emitted from the contained sound source acting acoustically directly on the wall of the similar cavity structure without passing through the leaky structure. The distance between the two sound sources is d0, and the distance from the center of the opening shape of the leaky structure to the other sound source (e.g., the "-" in Figure 6) is L. As shown in Figure 7, assuming L / d0 = 1.09, the larger the relative opening S / S0, the smaller the listening index. This is because the larger the relative opening, the more sound components are directly radiated from the contained sound source to the outside, and less sound reaches the listening position. As a result, the listening volume decreases as the relative opening increases, leading to a further decrease in the listening index. This suggests that the larger the opening, the lower the listening volume at the listening position.

[0039] In some embodiments, the relative position of the sound generating unit 11 and the user's ear canal (e.g., the cavity of the concha) affects the size of the gap formed between the sound generating unit 11 and the cavity of the concha. For example, when the end FE of the sound generating unit 11 abuts against the cavity of the concha, the size of the gap is small, and when the end FE of the sound generating unit 11 does not abut against the cavity of the concha, the size of the gap is large. Here, since the gap formed between the sound generating unit 11 and the cavity of the concha can be regarded as the leakage structure of the acoustic model in FIG. 4, the relative position of the sound generating unit 11 and the user's ear canal (e.g., the cavity of the concha) affects the number of leakage structures in the similar cavity structure formed by the sound generating unit 11 and the user's cavity of the concha and the size of the opening of the leakage structure. The size of the opening of the leakage structure directly affects listening quality. Specifically, the larger the opening of the leakage structure, the more sound components the sound generating unit 11 directly radiates to the outside, and the less sound reaches the listening position. Based on this, it is possible to make the sound generating unit 11 fit as closely as possible to the cavity of the user's concha in order to achieve both the listening volume of the sound generating unit 11 and the effect of reducing sound leakage and ensure the quality of the sound output from the sound generating unit 11. Accordingly, the ratio of the distance h1 in the vertical axis direction between the centroid O of the first projection and the highest point of the second projection to the height h of the second projection in the vertical axis direction can be controlled to 0.35 to 0.6, and the ratio of the distance w1 in the sagittal axis direction between the centroid O of the first projection and the rear end point of the second projection to the width w of the second projection in the sagittal axis direction can be controlled to 0.4 to 0.65. Preferably, in some embodiments, in order to ensure the quality of the acoustic output from the sound generating unit 11 and improve the comfort of wearing the open-type earphones, the ratio of the distance h1 in the vertical axis direction between the centroid O of the first projection and the highest point of the second projection to the height h of the second projection in the vertical axis direction may be set to 0.35 to 0.55, and the ratio of the distance w1 in the sagittal axis direction between the centroid O of the first projection and the rear end point of the second projection to the width w of the second projection in the sagittal axis direction may be set to 0.45 to 0.68.More preferably, the ratio of the distance h1 in the vertical axis direction between the centroid O of the first projection and the highest point of the second projection to the height h of the second projection in the vertical axis direction may be 0.35 to 0.5, and the ratio of the distance w1 in the sagittal axis direction between the centroid O of the first projection and the posterior end point of the second projection to the width w of the second projection in the sagittal axis direction may be 0.48 to 0.6.

[0040] In some embodiments, considering that different users' ears may have certain differences in shape and size, the aforementioned ratio range may vary within a certain range. For example, if a user has long earlobes, the height h of the second projection in the vertical axis direction will be larger than in general cases. In this case, when the user is wearing the open-type earphone 10, the ratio of the distance h1 in the vertical axis direction between the centroid O of the first projection and the highest point of the second projection to the height h of the second projection in the vertical axis direction will be smaller, and may be, for example, 0.2 to 0.55. Similarly, in some embodiments, when the user's helix is ​​curved forward, the width w of the second projection in the sagittal axis direction is smaller than in general, and the distance w1 between the centroid O of the first projection and the rear end point of the second projection in the sagittal axis direction is also small. In this case, when the user is wearing the open-type earphone 10, the ratio of the distance w1 between the centroid O of the first projection and the rear end point of the second projection in the sagittal axis direction to the width w of the second projection in the sagittal axis direction may be large, and may be, for example, 0.4 to 0.75.

[0041] Different users have different ears. For example, some users have longer earlobes. In this case, the definition of the open-type earphone 10 may be affected by the ratio of the distance (the seventh distance) between the centroid O of the first projection and the highest point of the second projection to the height of the second projection on the vertical axis. As shown in FIG. 5B , the highest point A3 and the lowest point A4 of the connection area between the user's auricle and head are selected for explanation. The highest point of the connection area between the auricle and head may be understood as the position where the projection of the connection area between the auricle and head on the sagittal plane has the greatest distance from the projection of a specific point on the neck on the sagittal plane. The lowest point of the connection area between the auricle and head may be understood as the position where the projection of the connection area between the auricle and head on the sagittal plane has the smallest distance from the projection of a specific point on the neck on the sagittal plane. To ensure the quality of the sound output from the sound generating unit 11 by balancing the listening volume of the sound generating unit 11 and the sound leakage reduction effect, the sound generating unit 11 can be fitted as closely as possible to the user's concha cavity. Accordingly, the ratio of the distance h3 in the vertical axis direction between the centroid O of the first projection and the highest point of the projection of the connection region of the auricle and the head onto the sagittal plane to the height h2 from the highest point to the lowest point of the projection of the connection region of the auricle and the head onto the sagittal plane in the vertical axis direction can be controlled to 0.4 to 0.65, and the ratio of the distance w1 in the sagittal axis direction between the centroid O of the first projection and the posterior end point of the second projection to the width w of the second projection in the sagittal axis direction can be controlled to 0.4 to 0.65. Preferably, in some embodiments, in order to ensure the quality of the acoustic output from the sound generating unit 11 and improve comfort when wearing the open-type earphones, the ratio of the distance h3 in the vertical axis direction between the centroid O of the first projection and the highest point of the projection of the connection region of the auricle and the head onto the sagittal plane to the height h2 from the highest point to the lowest point of the projection of the connection region of the auricle and the head onto the sagittal plane in the vertical axis direction may be controlled to 0.45 to 0.6, and the ratio of the distance w1 in the sagittal axis direction between the centroid O of the first projection and the rear end point of the second projection to the width w of the second projection in the sagittal axis direction may be controlled to 0.45 to 0.68.More preferably, the range of the ratio of the distance h3 in the vertical axis direction between the centroid O of the first projection and the highest point of the projection of the connection region of the auricle and the head onto the sagittal plane to the height h2 from the highest point to the lowest point of the projection of the connection region of the auricle and the head onto the sagittal plane in the vertical axis direction may be 0.5 to 0.6, and the range of the ratio of the distance w1 in the sagittal axis direction between the centroid O of the first projection and the posterior end point of the second projection to the width w of the second projection in the sagittal axis direction may be 0.48 to 0.6.

[0042] FIG. 8 is an exemplary schematic view of an open-type earphone according to some other embodiments of the present disclosure.

[0043] 3 and 8, when a user wears the open-type earphone 10 and the sound generating unit 11 is inserted into the cavity of the concha, the centroid O of the first projection may be located within the area surrounded by the contour of the second projection, which may be understood as the projection onto the sagittal plane of the contours of the user's helix, earlobe contour, tragus contour, intertragal notch, antitragal apex, antihelical notch, etc. In some embodiments, the listening volume, sound leakage reduction effect, and wearing comfort and stability of the sound generating unit may be improved by adjusting the distance between the centroid O of the first projection and the contour of the second projection. For example, if the sound generating unit 11 is located on the top of the auricle, the earlobe, the facial area in front of the auricle, or between the inner contour 1014 of the auricle and the outer edge of the cavity of the concha, specifically, if the distance between the centroid O of the first projection and a point in a specific area of ​​the contour of the second projection is too small and the distance between a point in another area is too large, the sound generating unit will not be able to form a similar cavity structure to the cavity of the concha (acoustic model shown in FIG. 4 ), which will affect the sound output effect of the open-type earphone 10. To ensure the sound output quality when a user is wearing the open-type earphone 10, in some embodiments, the range of the distance between the centroid O of the first projection and the contour of the second projection may be 10 mm to 52 mm, that is, the distance between the centroid O of the first projection and any point on the contour of the second projection is 10 mm to 52 mm. Preferably, to further improve the wearing comfort of the open-type earphone 10 and optimize the similar-cavity structure formed when the sound-generating unit 11 engages with the cavity of the concha, the distance between the centroid O of the first projection and the contour of the second projection may be set to a range of 12 mm to 50.5 mm. More preferably, the distance between the centroid O of the first projection and the contour of the second projection may be set to a range of 13.5 mm to 50.5 mm. In some embodiments, by controlling the distance between the centroid O of the first projection and the contour of the second projection to a range of 10 mm to 52 mm, most of the sound-generating unit 11 can be positioned near the user's ear canal, and at least a portion of the sound-generating unit can enter the cavity of the concha of the user to form the acoustic model shown in FIG. 4 , thereby ensuring that the sound output from the sound-generating unit 11 is well transmitted to the user.As a specific example, in some embodiments, the minimum distance d1 between the centroid O of the first projection and the contour of the second projection may be 20 mm, and the maximum distance d2 may be 48.5 mm.

[0044] In some embodiments, when a user wears the open-type earphone 10, if the distance between the centroid O of the first projection and the projection of the first portion 121 of the earhook on the sagittal plane is too large, problems such as unstable wearing (in this case, the sound generating unit 11 and the earhook cannot effectively clamp the ear) and the sound generating unit 11 cannot effectively enter the cavity of the concha. If the distance is too small, not only will it affect the relative position of the sound generating unit 11 and the cavity of the concha and the ear canal of the user, but the sound generating unit 11 or the earhook may press against the ear, resulting in poor wearing comfort. Based on this, to avoid the above-mentioned problems, in some embodiments, the range of the distance between the centroid O of the first projection and the projection of the first portion 121 of the earhook on the sagittal plane may be set to 18 mm to 43 mm. By controlling this distance to 18 mm to 43 mm, it is possible to ensure that the ear hook fits well to the user's ear and that the sound generating unit 11 is positioned exactly in the user's concha, thereby enabling the acoustic model shown in FIG. 4 to be configured and ensuring that the sound output from the sound generating unit 11 is transmitted well to the user. Preferably, in some embodiments, to further improve the stability of the open-type earphone when worn and ensure a listening effect of the sound generating unit 11 at the opening of the ear canal, the range of the distance between the centroid O of the first projection and the projection of the first portion 121 of the ear hook onto the sagittal plane may be set to 20 mm to 41 mm. More preferably, the range of the distance between the centroid O of the first projection and the projection of the first portion 121 of the ear hook onto the sagittal plane may be set to 22 mm to 40.5 mm. As a specific example, the minimum distance d3 between the projection of the centroid O of the first projection onto the user's sagittal plane and the projection of the first part 121 of the ear hook onto the sagittal plane may be 21 mm, and the maximum distance d4 between the projection of the centroid O of the first projection onto the user's sagittal plane and the projection of the first part 121 of the ear hook onto the sagittal plane may be 41.2 mm.

[0045] In some embodiments, because the earhook itself has elasticity, the distance between the sound generating unit 11 and the earhook changes constantly between the worn state and the unworn state (usually the distance in the unworn state is smaller than the distance in the worn state). For example, in some embodiments, when the open-type earphone 10 is unworn, the range of the distance between the centroid of the projection of the sound generating unit 11 onto a specific reference plane and the projection of the first part 121 of the earhook onto the specific reference plane may be 15 mm to 38 mm. Preferably, when the open-type earphone 10 is unworn, the range of the distance between the centroid of the projection of the sound generating unit 11 onto a specific reference plane and the projection of the first part 121 of the earhook onto the specific reference plane may be 16 mm to 36 mm. In some embodiments, the distance between the centroid of the projection of the sound generating unit onto a specific reference plane and the projection of the first portion 121 of the ear hook onto a specific reference plane is set slightly smaller in the unworn state than in the worn state. This allows the ear hook to apply a certain clamping force to the user's ear when the open-type earphone 10 is worn, thereby improving the user's wearing stability without affecting the user's wearing experience. In some embodiments, the specific reference plane may be the sagittal plane, and in this case, the centroid of the projection of the sound generating unit onto the sagittal plane in the unworn state can be considered to be the centroid of the projection of the sound generating unit onto the specific reference plane. For example, the unworn state here may be realized by removing the pinna structure of a human head model and fixing the sound generating unit to the human head model using a fastener or adhesive in the same position as in the worn state. In some embodiments, the specific reference plane may be the plane of the ear hook. The ear hook structure is an arc-shaped structure, and the ear hook plane is the plane formed by the three outermost protruding points of the ear hook, i.e., the plane that supports the ear hook when the ear hook is placed freely (i.e., without external force). For example, when the ear hook is placed freely on a horizontal surface, the horizontal plane supports the ear hook and can be considered as the ear hook plane. In another embodiment, the ear hook plane may be a plane formed by a bisector that equally or approximately equally divides the ear hook along the longitudinal extension direction of the ear hook.When worn, the ear hook plane has a certain angle with respect to the sagittal plane, but at this time, the ear hook can be considered to fit approximately to the head, so the angle is small and, for ease of calculation and explanation, the ear hook plane may be used here instead of the sagittal plane as a specific reference plane.

[0046] FIG. 9 is an exemplary schematic view of an open-type earphone according to some other embodiments of the present disclosure.

[0047] As shown in FIG. 9 , in some embodiments, the projection of the sound-generating unit onto the sagittal plane and the projection of the user's cavity of the concha (e.g., the dotted line portion in FIG. 9 ) onto the sagittal plane may have an overlapping portion, that is, when the user is wearing the open-type earphone, part or all of the sound-generating unit covers the cavity of the concha, and when the open-type earphone is in a worn state, the centroid of the first projection (e.g., point O in FIG. 9 ) is located within the projection area of ​​the user's cavity of the concha onto the sagittal plane. The position of the centroid O of the first projection is related to the dimensions of the sound generating unit. For example, if the dimensions of the sound generating unit 11 in the major axis direction Y or the minor axis direction Z are too small, the volume of the sound generating unit 11 will be relatively small and the area of ​​the diaphragm installed inside the sound generating unit 11 will also be relatively small, resulting in low efficiency of the diaphragm pushing the air inside the housing of the sound generating unit 11 to generate sound, affecting the acoustic output effect of the open-type earphone. If the dimensions of the sound generating unit 11 in the major axis direction Y or the minor axis direction Z are too large, the sound generating unit 11 will not be able to extend beyond the range of the cavity of the concha and enter the cavity of the concha, and will not be able to form a similar cavity structure, or the total dimension of the gap formed between the sound generating unit 11 and the cavity of the concha will be large, affecting the listening volume at the opening of the ear canal and the effect of reducing sound leakage in the far field when the user is wearing the open-type earphone 10. In some embodiments, to ensure excellent sound output quality when a user wears the open-type earphone 10, the distance between the centroid O of the first projection and the projection of the edge of the user's concha cavity on the sagittal plane may be in the range of 4 mm to 25 mm. Preferably, the distance between the centroid O of the first projection and the projection of the edge of the user's concha cavity on the sagittal plane may be in the range of 6 mm to 20 mm. More preferably, the distance between the centroid O of the first projection and the projection of the edge of the user's concha cavity on the sagittal plane may be in the range of 10 mm to 18 mm. As a specific example, in some embodiments, the minimum distance d5 between the centroid O of the first projection and the projection of the edge of the user's concha cavity on the sagittal plane may be 5 mm, and the maximum distance d6 between the centroid O of the first projection and the projection of the edge of the user's concha cavity on the sagittal plane may be 24.5 mm.In some embodiments, by controlling the distance between the centroid of the first projection and the projection of the edge of the user's cavity of the concha onto the sagittal plane to a range of 4 mm to 25 mm, at least a portion of the structure of the sound generating unit 11 can cover the cavity of the concha and form a cavity structure similar to the cavity of the concha. This not only enables the sound output from the sound generating unit to be efficiently transmitted to the user, but also improves the stability of the open-type earphone 10 when worn due to the force acting on the sound generating unit 11 by the cavity of the concha.

[0048] The positional relationship between the sound generating unit 11 and the auricle or the cavity of the concha according to the embodiments of the present specification can be determined by the following exemplary method. First, a photograph of a human head model having an ear is taken at a specific position along a direction directly facing the sagittal plane, and the edges of the cavity of the concha and the contours of the auricle (e.g., inner and outer contours) are marked. These marked contours can be considered as the projected contours of each structure of the ear onto the sagittal plane. Next, a photograph of a human head model wearing open-type earphones is taken at the same specific position and angle, and the contour of the sound generating unit is marked. This contour can be considered as the projection of the sound generating unit onto the sagittal plane. The positional relationship between the sound generating unit (e.g., centroid, edge, etc.) and the edges of the cavity of the concha and the auricle can be determined by comparative analysis.

[0049] 10A is an exemplary schematic diagram of an open-type earphone according to some embodiments of the present disclosure, and FIG. 10B is a schematic diagram of a user wearing the open-type earphone according to some embodiments of the present disclosure. As shown in FIG. 10A and FIG. 10B, the open-type earphone 10 may include a suspension structure 12, an audio generating unit 11, and a battery compartment 13, and the audio generating unit 11 and the battery compartment 13 are located at both ends of the suspension structure 12, respectively. In some embodiments, the suspension structure 12 may be an ear hook as shown in FIG. 10A or 10B, and the ear hook may include a first part 121 and a second part 122 connected in sequence, where the first part 121 is hung between the posterior medial surface of the user's auricle and the head, and may extend along the posterior medial surface of the auricle toward the neck, and the second part 122 extends toward the anterior lateral surface of the auricle and is connected to the sound-generating unit 11, thereby attaching the sound-generating unit 11 near the user's ear canal but not blocking the ear canal opening, and one end of the first part 121 away from the sound-generating unit 11 is connected to a battery housing 13, and a battery electrically connected to the sound-generating unit 11 is installed in the battery housing 3. In some embodiments, the ear hook has an arc-shaped structure that fits the connection point between the human auricle and the head, and when a user is wearing the open-type earphone 10, the sound-generating unit 11 and the battery housing 13 may be located on the anterior-lateral surface and the posterior-medial surface of the auricle, respectively, and the sound-generating unit 11 extends toward the first portion 121 of the ear hook, so that the entire or partial structure of the sound-generating unit 11 enters the cavity of the concha and engages with the cavity of the concha to form a similar cavity structure. If the dimension (length) of the first portion 121 in the extension direction is too small, the battery housing 13 will be located close to the top of the user's auricle, and in this case, the first portion 121 and the second portion 121 will not be able to provide the open-type earphone 10 with a sufficient contact area with the ear part and / or head, and the open-type earphone 10 will easily come off the ear part. Therefore, the length of the first portion 121 of the ear hook needs to be long enough to ensure that the ear hook can provide a sufficient contact area with the ear and / or head, thereby increasing the resistance of the open earphone from being removed from the ear and / or head of the human body.Furthermore, if the distance between the end of the sound generating unit 11 and the first ear hook part 121 is too large, the battery housing part 13 will be far away from the auricle when worn, and the open-type earphone will not be able to provide sufficient clamping force, making it easy for the earphone to come off.If the distance between the end of the sound generating unit 11 and the first ear hook part 121 is too small, the battery housing part 13 or the sound generating unit 11 will press against the auricle, affecting the user's comfort when worn for long periods of time. Here, taking the case where the user is wearing open-type earphones as an example, the length of the first part 121 of the earhook in the extension direction and the distance between the end of the sound generating unit 11 and the first part 121 can be represented by the distance between the centroid O of the sagittal plane projection of the sound generating unit 11 (i.e., the first projection) and the centroid Q of the sagittal plane projection of the battery housing 13. In order to ensure that the earhook can provide a sufficient contact area with the ear and / or head, the distance between the centroid Q of the sagittal plane projection of the battery housing 13 and a horizontal plane (e.g., the ground) is smaller than the distance between the centroid O of the sagittal plane projection of the sound generating unit 11 and the horizontal plane. That is, when worn, the centroid Q of the sagittal plane projection of the battery housing 13 is located below the centroid O of the sagittal plane projection of the sound generating unit 11. When worn, the sound generating unit 11 must be partially or entirely inserted into the cavity of the concha, and its position must be relatively fixed. If the distance between the centroid O of the sound generating unit 11 projected onto the sagittal plane and the centroid Q of the battery housing 13 projected onto the sagittal plane is too small, the battery housing 13 will abut against the posterior medial surface of the auricle, thereby pressing against the posterior medial surface of the auricle, affecting the comfort of the user when wearing the earphones. If the distance between the centroid O of the sound generating unit 11 projected onto the sagittal plane and the centroid Q of the battery housing 13 projected onto the sagittal plane is too large, the length of the first earhook part 121 will also be too long, causing the user to clearly feel that the earphones located on the posterior medial surface of the auricle are too heavy when wearing them, or the battery housing 13 will be far away from the auricle, making them prone to coming off during exercise, affecting the comfort of the user when wearing the earphones and the stability of the open-type earphones when worn. In order to ensure that the user has excellent stability and comfort when wearing the open-type earphone 10, the range of the fourth distance d8 between the centroid O of the projection of the sound generating unit 11 onto the sagittal plane and the centroid Q of the projection of the battery storage unit 13 onto the sagittal plane when the earphone is worn is set to 20 mm to 30 mm.Preferably, the range of the fourth distance d8 between the centroid O of the projection of the sound generating unit 11 onto the sagittal plane and the centroid Q of the projection of the battery housing 13 onto the sagittal plane is 22 mm to 28 mm. More preferably, the range of the fourth distance d8 between the centroid O of the projection of the sound generating unit 11 onto the sagittal plane and the centroid Q of the projection of the battery housing 13 onto the sagittal plane is 23 mm to 26 mm. Because the ear hook itself has elasticity, the distance between the centroid O of the projection of the sound generating unit 11 onto the sagittal plane and the centroid Q of the projection of the battery housing 13 onto the sagittal plane changes when the open-type earphone 10 is worn and when it is not worn. In some embodiments, the range of the third distance d7 between the centroid O of the projection of the sound generating unit 11 onto a specific reference plane and the centroid Q of the projection of the battery housing 13 onto a specific reference plane is 16.7 mm to 25 mm when it is not worn. Preferably, in the unworn state, the third distance d7 between the centroid of the projection of the sound generating unit 11 onto the specific reference plane and the centroid of the projection of the battery housing 13 onto the specific reference plane ranges from 18 mm to 23 mm. More preferably, in the unworn state, the third distance d7 between the centroid of the projection of the sound generating unit 11 onto the specific reference plane and the centroid of the projection of the battery housing 13 onto the specific reference plane ranges from 19.6 mm to 21.8 mm. In some embodiments, the specific reference plane may be a human sagittal plane or an ear hook plane. In some embodiments, the specific reference plane may be a sagittal plane. In this case, in the unworn state, the centroid of the projection of the sound generating unit onto the sagittal plane can be considered as the centroid of the projection of the sound generating unit onto the specific reference plane, and the centroid of the projection of the battery housing onto the sagittal plane can be considered as the centroid of the projection of the battery housing onto the specific reference plane. For example, the unworn state here may be represented by removing the pinna structure of a human head model and fixing the sound generating unit to the human head model using a fastener or adhesive in the same orientation as in the worn state. In some embodiments, the specific reference plane may be the ear hook plane. The ear hook structure is an arc-shaped structure, and the ear hook plane is the plane formed by the three outermost protruding points of the ear hook, that is, the plane that supports the ear hook when the ear hook is placed freely. For example, when the ear hook is placed on a horizontal surface, the horizontal plane supports the ear hook and can be considered as the ear hook plane.In another embodiment, the ear hook plane may be a plane formed by a bisector that divides the ear hook equally or approximately equally along the longitudinal direction of the ear hook. In a worn state, the ear hook plane has a certain angle with respect to the sagittal plane. However, since the ear hook can be considered to fit the head approximately at this time, the angle is small. For ease of calculation and explanation, the ear hook plane may be used as a specific reference plane instead of the sagittal plane.

[0050] For example, if the specific reference plane is the sagittal plane, the distance between the centroid O of the projection of the sound generating unit 11 onto the sagittal plane and the centroid Q of the projection of the battery housing 13 onto the sagittal plane changes when the open-type earphone 10 is worn and when it is not worn, and the value of this change can reflect the flexibility of the earhook. If the earhook is too flexible, the open-type earphone 10 will have an unstable overall structure and shape, will not be able to firmly support the sound generating unit 11 and the battery housing 13, will be less stable when worn, and will be more likely to come off. Considering that the earhook needs to be hung on the connection point between the auricle and the head, if the earhook is too flexible, the open-type earphone 10 will be less likely to deform, and when a user wears the open-type earphone, the earhook will come into contact with, and ultimately press on, the area between the ear and / or head, affecting comfort when worn. To ensure that a user has excellent stability and comfort when wearing the open-type earphones 10, in some embodiments, the ratio of the change in the distance between the centroid O of the sagittal plane projection of the sound generating unit 11 and the centroid Q of the sagittal plane projection of the battery housing 13 between when the open-type earphones 10 are worn and when they are not worn to the distance between the centroid O of the sagittal plane projection of the sound generating unit 11 and the centroid Q of the sagittal plane projection of the battery housing 13 when the open-type earphones are not worn is set to a range of 0.3 to 0.8. Preferably, the ratio of the change in the distance between the centroid O of the sagittal plane projection of the sound generating unit 11 and the centroid Q of the sagittal plane projection of the battery housing 13 between when the open-type earphones 10 are worn and when they are not worn to the distance between the centroid O of the sagittal plane projection of the sound generating unit 11 and the centroid Q of the sagittal plane projection of the battery housing 13 when the open-type earphones are not worn is set to a range of 0.45 to 0.68.

[0051] For details regarding the shape of the projection of battery housing 13 onto the sagittal plane and the centroid Q, please refer to the relevant explanation of the shape of the projection of sound generating unit 11 onto the sagittal plane and the centroid O in this specification. Also, battery housing 13 and first earhook part 121 may be independent structures, or battery housing 13 and first earhook part 121 may be connected by a fitting, fastening, or other method, and when determining the projection of battery housing 13, the projection of battery housing 13 onto the sagittal plane can be more accurately obtained based on the junction point or junction line between battery housing 13 and first part 121.

[0052] In some embodiments, the sound-generating unit 11 may be a three-dimensional structure having a rectangular parallelepiped, an approximately rectangular parallelepiped, a cylinder, an ellipsoid, or another regular or irregular shape. When the sound-generating unit 11 is inserted into the cavity of the concha, the sound-generating unit 11 does not completely cover or fit the contour of the cavity of the concha because the overall contour of the cavity of the concha is an irregularly shaped structure such as an arc, so some gaps are formed. The overall dimensions of these gaps can be considered to be approximately the openings S of the leakage structure of the similar cavity structure shown in Figure 6 above. The dimensions where the sound-generating unit 11 fits or covers the contour of the cavity of the concha can be considered to be approximately the area S0 of the similar cavity structure shown in Figure 6 above where no holes are formed. As shown in Figure 7, the larger the relative opening S / S0, the smaller the listening index. This is because the larger the relative opening, the more sound components are radiated directly outward from the contained sound source, and the less sound reaches the listening position, which results in a decrease in listening volume as the relative opening increases, and further in a decrease in listening index. In some embodiments, it is necessary to ensure that the auditory canal is not blocked and to consider minimizing the size of the gap formed between the sound-generating unit 11 and the cavity of the concha. Since the overall volume of the sound-generating unit 11 should not be too large or too small, it is necessary to focus on the mounting angle of the sound-generating unit 11 with respect to the pinna and the cavity of the concha, assuming that the overall volume or shape of the sound-generating unit 11 is specific. For example, if the sound generating unit 11 has an approximately rectangular parallelepiped structure, when a user wears the open-type earphone 10 and the upper wall 111 (also called the upper surface) or the lower wall 112 (also called the lower surface) of the sound generating unit 11 is placed parallel to or approximately parallel to the horizontal plane, or is placed vertically or approximately vertically (this may be understood as the projection of the upper wall 111 or the lower wall 112 of the sound generating unit 11 onto the sagittal plane being placed parallel to or approximately parallel to the sagittal axis, or being placed vertically or approximately vertically), the sound generating unit 11 will fit against or cover a part of the cavity of the concha, forming a large gap that will affect the user's listening volume.In some embodiments, in order to increase the listening volume at the opening of the ear canal by making all or part of the sound generating unit 11 enter the cavity of the concha, increasing the area of ​​the area that the sound generating unit 11 covers, and reducing the size of the gap formed between the sound generating unit 11 and the edge of the cavity of the concha, the inclination angle α between the projection of the upper wall 111 or the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the horizontal direction may be in the range of 10° to 28° when the open-type earphone 10 is worn. Preferably, in the state in which the open-type earphone 10 is worn, the inclination angle α between the projection of the upper wall 111 or the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the horizontal direction may be in the range of 13° to 21°. More preferably, in the state in which the open-type earphone 10 is worn, the inclination angle α between the projection of the upper wall 111 or the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the horizontal direction may be in the range of 15° to 19°. The angle of inclination of the upper wall 111 of the sound generating unit 11 between the projection onto the sagittal plane and the horizontal direction may be the same as or different from the angle of inclination of the lower wall 112 between the projection onto the sagittal plane and the horizontal direction. For example, when the upper wall 111 of the sound generating unit 11 is parallel to the lower wall 112, the angle of inclination of the upper wall 111 between the projection onto the sagittal plane and the horizontal direction is the same as the angle of inclination of the lower wall 112 between the projection onto the sagittal plane and the horizontal direction. Furthermore, when the upper wall 111 of the sound generating unit 11 is not parallel to the lower wall 112, or when one of the upper wall 111 or the lower wall 112 is a flat wall and the other is a non-flat wall (e.g., a curved wall), the angle of inclination of the upper wall 111 between the projection onto the sagittal plane and the horizontal direction is different from the angle of inclination of the lower wall 112 between the projection onto the sagittal plane and the horizontal direction. Furthermore, if the upper wall 111 or the lower wall 112 is a curved surface, the projection of the upper wall 111 or the lower wall 112 onto the sagittal plane may be a curve or a broken line, and in this case, the inclination angle between the projection of the upper wall 111 onto the sagittal plane and the horizontal direction may be the angle between the tangent to the point of the curve or broken line where the distance to the ground is maximum and the horizontal direction, and the inclination angle between the projection of the lower wall 112 onto the sagittal plane and the horizontal direction may be the angle between the tangent to the point of the curve or broken line where the distance to the ground is minimum and the horizontal direction.In some embodiments, when the upper wall 111 or the lower wall 112 is a curved surface, a tangent to the projection parallel to the longitudinal axis direction Y may be selected, and the angle between the tangent and the horizontal direction may represent the inclination angle between the projection of the upper wall 111 or the lower wall 112 onto the sagittal plane and the horizontal direction.

[0053] In the examples of the present specification, one end of the sound generating unit 11 is connected to the second part 122 of the suspension structure, and this end may be called a fixed end, and the end of the sound generating unit 11 facing away from the fixed end may be called a free end or an end, and the end of the sound generating unit 11 faces the first part 121 of the earhook. In the worn state, the suspension structure 12 (e.g., the earhook) has an apex (e.g., apex T1 shown in FIG. 10B), i.e., a position where the distance to the horizontal plane is maximum, and this apex T1 is close to the connection point between the first part 121 and the second part 12, and the upper wall is a side wall (e.g., upper wall 111 shown in FIGS. 10B and 11) other than the fixed end and end of the sound generating unit 11, where the distance between the center point in the vertical axis direction (e.g., the geometric center point) and the apex of the earhook is minimum. Accordingly, the lower wall is the side wall opposite the upper wall of the sound generating unit 11, i.e., the side wall other than the fixed end and end of the sound generating unit 11, where the distance between the center point (e.g., the geometric center point) of the side wall in the vertical axis direction and the upper vertex of the ear hook is the greatest (e.g., the lower wall 112 shown in Figures 10B and 11).

[0054] The entire or partial structure of the sound generating unit 11 can enter the cavity of the concha to form a similar cavity structure as shown in Fig. 4. The listening effect when a user wears the open-type earphone 10 is related to the size of the gap formed between the sound generating unit 11 and the edge of the cavity of the concha; the smaller the gap size, the higher the listening volume at the opening of the user's ear canal. The size of the gap formed between the sound generating unit 11 and the edge of the cavity of the concha is related to the inclination angle between the projection of the upper wall 111 or the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the horizontal plane, as well as to the size of the sound generating unit 11. For example, if the size of the sound generating unit 11 (particularly the dimension along the minor axis direction Z shown in Fig. 12) is too small, the gap formed between the sound generating unit 11 and the edge of the cavity of the concha will be too large, which will affect the listening volume at the opening of the user's ear canal. If the dimensions of the sound generating unit 11 (particularly the dimensions along the minor axis direction Z shown in FIG. 12 ) are too large, the portion of the sound generating unit 11 that can enter the cavity of the concha may be limited, or the sound generating unit 11 may completely cover the cavity of the concha. In this case, the ear canal is blocked, preventing communication between the ear canal and the external environment, and thus failing to achieve the original design purpose of the open-type earphone itself. Furthermore, if the dimensions of the sound generating unit 11 are too large, it may affect the user's comfort when wearing the earphone and the convenience of carrying it. As shown in FIG. 12 , in some embodiments, the distance between the midpoint of the projection of the upper wall 111 and the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the highest point of the second projection may reflect the dimension of the sound generating unit 11 along the minor axis direction Z (the direction indicated by the arrow Z in FIG. 12 ) and the position of the sound generating unit 11 relative to the cavity of the concha. To ensure that the open-type earphone 10 does not block the user's ear canal and to improve the listening effect of the open-type earphone 10, in some embodiments, the distance d10 between the midpoint C1 of the projection of the upper wall 111 of the sound-generating unit 11 onto the sagittal plane and the highest point A1 of the second projection is set to a range of 20 mm to 38 mm, and the distance d11 between the midpoint C2 of the projection of the lower wall 112 of the sound-generating unit 11 onto the sagittal plane and the highest point A1 of the second projection is set to a range of 32 mm to 57 mm.Preferably, the range of the distance d10 between the midpoint C1 of the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane and the highest point A1 of the second projection is 24 mm to 36 mm, and the range of the distance d11 between the midpoint C2 of the projection of the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the highest point A1 of the second projection is 36 mm to 54 mm. More preferably, the range of the distance between the midpoint C1 of the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane and the highest point A1 of the second projection is 27 mm to 34 mm, and the range of the distance between the midpoint C2 of the projection of the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the highest point A1 of the second projection is 38 mm to 50 mm. Note that, when the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane is a curve or a broken line, the midpoint C1 of the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane can be selected using the following exemplary method: Two points on the projection of the upper wall 111 onto the sagittal plane that are the greatest distance apart along the long axis direction of the sound generating unit 111 are selected to draw a line segment, and the midpoint of the line segment is selected to draw a perpendicular bisector, and the point where the perpendicular bisector intersects with the projection is the midpoint of the projection of the upper wall 111 onto the sagittal plane of the sound generating unit 11. In some alternative embodiments, the point on the projection of the upper wall 111 onto the sagittal plane that is the smallest distance from the highest point of the second projection may be selected as the midpoint C1 of the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane. The midpoint of the projection of the lower wall 112 of the sound generating unit 11 onto the sagittal plane can be selected as described above, and for example, the point at which the distance between the projection of the lower wall 112 onto the sagittal plane and the highest point of the second projection is greatest may be selected as the midpoint C2 of the projection of the lower wall 112 of the sound generating unit 11 onto the sagittal plane.

[0055] In some embodiments, the distance between the midpoint of the projection of the upper wall 111 and the lower wall 112 of the sound-generating unit 11 onto the sagittal plane and the projection of the apex of the ear loop onto the sagittal plane can reflect the dimension of the sound-generating unit 11 along the short axis direction Z (the direction indicated by arrow Z in FIG. 3 ). The apex of the ear loop may be the position of the ear loop where the distance is greatest in the perpendicular axis direction relative to a particular point on the user's neck when the user is wearing the open-type earphone, for example, apex T1 shown in FIG. 10B . To ensure that the open-type earphone 10 does not block the user's ear canal and to improve the listening experience of the open-type earphone 10, in some embodiments, the range of the distance d13 between the midpoint C1 of the projection of the upper wall 111 of the sound-generating unit 11 onto the sagittal plane and the projection of the upper ear hook vertex T1 onto the sagittal plane is 17 mm to 36 mm, and the range of the distance d14 between the midpoint C2 of the projection of the lower wall 112 of the sound-generating unit 11 onto the sagittal plane and the projection of the upper ear hook vertex T1 onto the sagittal plane is 28 mm to 52 mm. Preferably, the range of the distance d13 between the midpoint C1 of the projection of the upper wall 111 of the sound-generating unit 11 onto the sagittal plane and the projection of the upper ear hook vertex T1 onto the sagittal plane is 21 mm to 32 mm, and the range of the distance d14 between the midpoint C2 of the projection of the lower wall 112 of the sound-generating unit 11 onto the sagittal plane and the projection of the upper ear hook vertex T1 onto the sagittal plane is 32 mm to 48 mm. More preferably, the range of the distance d13 between the midpoint C1 of the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane and the projection of the upper vertex T1 of the ear hook onto the sagittal plane is set to 24 mm to 30 mm, and the range of the distance d14 between the midpoint C2 of the projection of the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the projection of the upper vertex T1 of the ear hook onto the sagittal plane is set to 35 mm to 45 mm.

[0056] 13A-13C are schematic diagrams of different exemplary engagement positions of an open-type earphone according to the present disclosure with a user's ear canal.

[0057] The dimensions of the gap formed between the sound generating unit 11 and the edge of the cavity of the concha are related to the inclination angle between the projection of the upper wall 111 or the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the horizontal plane, the dimensions of the sound generating unit 11 (e.g., the dimension along the short axis direction Z shown in FIG. 3 ), and the distance between the end FE of the sound generating unit 11 and the edge of the cavity of the concha. The end FE of the sound generating unit 11 refers to the end of the sound generating unit 11 that is installed opposite the fixed end connected to the suspension structure 12 and is also called the free end. The sound generating unit 11 may have either a regular structure or an irregular structure. Here, the end FE of the sound generating unit 11 will be described as an example to further explain the structure. For example, if the sound generating unit 11 has a rectangular parallelepiped structure, the end wall surface of the sound generating unit 11 is flat, and in this case, the end FE of the sound generating unit 11 is the end side wall that is installed opposite the fixed end connected to the suspension structure 12. Furthermore, for example, when the sound generating unit 11 is a sphere, an ellipsoid, or an irregular structure, the end FE of the sound generating unit 11 may refer to a specific region away from the fixed end obtained by cutting the sound generating unit 11 along the YZ plane (the plane formed by the minor axis direction Z and the thickness direction X), and the ratio of the dimension of the specific region along the major axis direction Y to the dimension of the sound generating unit along the major axis direction Y may be 0.05 to 0.2.

[0058] Specifically, one end of the sound generating unit 11 is connected to the suspension structure 12 (the second earhook portion 122) and is positioned relatively forward when worn by a user. The distance between the end FE (free end) and the fixed end of the sound generating unit 11 can reflect the dimension of the sound generating unit 11 in the longitudinal direction (the direction indicated by arrow Y in FIG. 3 ). Therefore, the position of the end FE of the sound generating unit 11 relative to the cavity of the concha affects the area that the sound generating unit 11 covers, thereby affecting the dimension of the gap formed between the sound generating unit 11 and the contour of the cavity of the concha, and further affecting the listening volume at the opening of the user's ear canal. The distance between the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane can reflect the position of the end FE of the sound generating unit 11 relative to the cavity of the concha and the degree to which the sound generating unit 11 covers the user's cavity of the concha. The cavity of the concha refers to the concave region below the crus helicalis; that is, the edge of the cavity of the concha is composed of at least the lower side wall of the crus helicalis, the contour of the tragus, the intertragic notch, the antitragic apex, the antihelical notch, and the contour of the antihelical body corresponding to the cavity of the concha. If the projection of the end FE of the sound generating unit 11 onto the sagittal plane is a curve or a broken line, the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane can be selected by the following exemplary method: Two points on the projection of the end FE onto the sagittal plane that are the longest apart in the short-axis direction Z are selected, and a line segment is drawn. A perpendicular bisector is then drawn by selecting the midpoint of the line segment, and the point where the perpendicular bisector and the projection intersect is the midpoint of the projection of the end of the sound generating unit 11 onto the sagittal plane. In some embodiments, when the end FE of the sound generating unit 11 is a curved surface, the point of contact of the tangent of the projection parallel to the minor axis direction Z may be selected as the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane.

[0059] 13A , when the sound generating unit 11 is not in contact with the edge of the cavity of the concha 102, the end FE of the sound generating unit 11 is located within the cavity of the concha 102; that is, the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane does not overlap with the projection of the edge of the cavity of the concha 102 onto the sagittal plane. As shown in FIG. 13B , the sound generating unit 11 of the open-type earphone 10 enters the cavity of the concha 102, and the end FE of the sound generating unit 11 abuts against the edge of the cavity of the concha 102. Note that in some embodiments, when the end FE of the sound generating unit 11 abuts against the edge of the cavity of the concha 102, the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane overlaps with the projection of the edge of the cavity of the concha 102 onto the sagittal plane. In some embodiments, when the end FE of the sound generating unit 11 abuts against the edge of the cavity of the concha 102, the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane may not overlap with the projection of the edge of the cavity of the concha 102 onto the sagittal plane. For example, the cavity of the concha 102 is a concave structure, the side wall corresponding to the cavity of the concha 102 is not a flat wall surface, and the projection of the edge of the cavity of the concha 102 onto the sagittal plane has an irregular two-dimensional shape. The projection of the side wall corresponding to the cavity of the concha 102 onto the sagittal plane may be on or outside the contour of the shape; therefore, the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane may not overlap with the projection of the edge of the cavity of the concha 102 onto the sagittal plane. For example, the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane may be inside or outside the projection of the edge of the cavity of the concha 102 onto the sagittal plane. In the examples of the present specification, when the end FE of the sound generating unit 11 is located in the cavity of the concha 102, if the distance between the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha 102 onto the sagittal plane is within a specific range (for example, 6 mm or less), it can be considered that the end FE of the sound generating unit 11 abuts the edge of the cavity of the concha 102. As shown in Fig. 13C, the sound generating unit 11 of the open-type earphone 10 covers the cavity of the concha, and the end FE of the sound generating unit 11 is located between the edge of the cavity of the concha 102 and the inner contour 1014 of the pinna.

[0060] As shown in Figures 13A to 13C, when the end FE of the sound generating unit 11 is located within the edge of the cavity of the concha 102, if the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha 102 onto the sagittal plane is too small, the area that the sound generating unit 11 covers in the cavity of the concha 102 will be too small, and the dimension of the gap formed between the sound generating unit 11 and the edge of the cavity of the concha will be large, affecting the listening volume at the opening of the user's ear canal. If the midpoint C3 of the projection of the end portion FE of the sound generating unit onto the sagittal plane is located between the projection of the edge of the cavity of the concha 102 onto the sagittal plane and the projection of the inner contour 1014 of the pinna onto the sagittal plane, and the distance between the midpoint C3 of the projection of the end portion FE of the sound generating unit onto the sagittal plane and the projection of the edge of the cavity of the concha 102 onto the sagittal plane is too large, the end portion FE of the sound generating unit 11 will interfere with the pinna, and it will be impossible to increase the proportion of the sound generating unit 11 that covers the cavity of the concha 102. Furthermore, if the end portion FE of the sound generating unit 11 is not positioned in the cavity of the concha 102 when the sound generating unit 11 is worn by a user, the edge of the cavity of the concha 102 will not be able to limit the position of the sound generating unit 11, and the sound generating unit 11 will be prone to coming off. Furthermore, if the dimensions of the sound generating unit 11 increase in a particular direction, its weight will increase, affecting the user's comfort when wearing it and its portability. Based on this, to ensure that the open-type earphone 10 has an excellent listening effect and is comfortable and stable when worn by a user, in some embodiments, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane is set to 16 mm or less. Preferably, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane is set to 13 mm or less. More preferably, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane is set to 8 mm or less. In some embodiments, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha 102 onto the sagittal plane may refer to the minimum distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha 102 onto the sagittal plane.In some embodiments, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha 102 onto the sagittal plane may refer to the distance along the sagittal axis. Furthermore, in a specific wearing scenario, a point other than the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane may abut the edge of the cavity of the concha. In this case, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha on the sagittal plane may be greater than 0 mm. In some embodiments, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha on the sagittal plane may be 2 mm to 16 mm. Preferably, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha on the sagittal plane may be 4 mm to 10.48 mm.

[0061] 14A and 14B are schematic diagrams illustrating an example of an open-type earphone in accordance with some other embodiments of the present disclosure, in a worn state, and in an unworn state, respectively.

[0062] 14A , in some embodiments, when a user is wearing the open-type earphone, the upper wall 111 of the sound-generating unit 11 forms a certain angle with the second portion 122 of the earhook to allow a portion or the entire structure of the sound-generating unit to enter the cavity of the concha. The included angle can be represented by the angle β between the projection of the upper wall 111 of the sound-generating unit 11 onto the sagittal plane and a tangent 126 to the projection of the second portion 122 of the earhook and the upper wall 111 of the sound-generating unit 11 onto the sagittal plane. Specifically, the upper wall of the sound-generating unit 11 and the second portion 122 of the earhook have a connection point, and the projection of the connection point onto the sagittal plane is point U. A tangent 126 to the projection of the second portion 122 of the earhook onto the sagittal plane passes through point U. If the upper wall 111 is a curved surface, the projection of the upper wall 111 onto the sagittal plane may be a curved line or a broken line. In this case, the angle between the projection of the upper wall 111 onto the sagittal plane and the tangent line 126 may be the angle between the tangent line 126 and the tangent line at the point where the distance to the ground of the curved line or broken line is greatest. In some embodiments, if the upper wall 111 is a curved surface, a tangent line of the projection parallel to the long axis direction Y may be selected, and the angle between the tangent line and the horizontal direction may represent the angle between the projection of the upper wall 111 onto the sagittal plane and the tangent line 126. In some embodiments, the included angle β may be in the range of 100° to 150°. Preferably, the included angle β may be in the range of 110° to 140°. More preferably, the included angle β may be in the range of 120° to 135°.

[0063] The human head can be considered to have a roughly spherical structure, and the auricle is a structure that protrudes outward relative to the head. When a user wears the open-type earphones, a portion of the ear hook 12 may abut against the user's head. There is a certain inclination angle between the sound-generating unit 11 and the ear hook plane so that the sound-generating unit 11 can enter the concha cavity 102. The inclination angle can be expressed as the included angle between the corresponding plane of the sound-generating unit 11 and the ear hook plane. In some embodiments herein, the ear hook plane may refer to a plane formed by a bisector that equally or nearly equally divides the ear hook 12 along the longitudinal extension direction (e.g., the plane where the dotted line 12A in FIG. 14B is located). In some implementations, the ear hook plane may be the plane formed by the three most outwardly protruding points of the ear hook, i.e., the plane that supports the ear hook when the ear hook is placed freely (without external force applied). For example, when the ear hook is placed on a horizontal surface, the horizontal surface supports the ear hook and can be considered the ear hook plane. In some embodiments, the corresponding plane 11A of the sound generating unit 11 may include a side wall of the sound generating unit 11 facing the anterior-lateral surface of the user's pinna (also referred to as an inner surface) or a side wall facing away from the anterior-lateral surface of the user's pinna (also referred to as an outer surface). If the side wall of the sound generating unit 11 facing away from the anterior-lateral surface of the user's pinna or the side wall facing away from the anterior-lateral surface of the user's pinna is a curved surface, the corresponding plane of the sound generating unit 11 may refer to a cut plane corresponding to the curved surface at its center, or a plane that substantially overlaps with a curve surrounded by the contours of the edges of the curved surface. Here, assuming that the sound generating unit 11 is aligned with the plane 11A on which the side wall facing the anterior-lateral surface of the user's pinna is located, the included angle θ formed by the plane 11A and the ear hook plane 12A is the inclination angle of the sound generating unit 11 with respect to the ear hook plane. In some embodiments, the included angle θ can be measured in the following exemplary manner.A projection of the side wall of sound generating unit 11 that is close to ear hook 12 (hereinafter referred to as the inner surface) onto the XY plane and a projection of ear hook 12 onto the XY plane are obtained along the short axis direction Z of sound generating unit 11. The two most protruding points of the projection of ear hook 12 onto the XY plane that are close to (or away from) the projection of the inner surface of sound generating unit 11 onto the XY plane are selected to draw a first line. If the projection of the inner surface of sound generating unit 11 onto the XY plane is a straight line, the included angle between the first line and the projection of the inner surface onto the XY plane is angle θ. If the inner surface of sound generating unit 11 is curved, the included angle between the first line and the long axis direction Y can be considered to be approximately angle θ. The inclination angle θ of the sound generating unit 11 relative to the ear hook plane can be measured using the above method for open-type earphones both when they are worn and when they are not. However, the difference is that the above method can be used directly when the earphones are not worn, and when they are worn, the open-type earphones are attached to a human head model or ear model and then measured using the above method. If the angle is too large, the contact area between the sound generating unit 11 and the anterior outer surface of the user's auricle is small, failing to provide sufficient contact resistance and making the earphones more likely to come off while worn by the user. Furthermore, the dimensions of the gap between the similar cavity structure formed between the sound generating unit 11 and the user's concha 102 will inevitably be too large, affecting the listening volume at the opening of the user's ear canal. If the angle is too small, the sound generating unit 11 will not be able to effectively enter the concha when worn by the user. To ensure a good listening experience when a user wears the open-type earphone 10 and to ensure stability when worn, in some embodiments, when the open-type earphone is worn, the inclination angle θ of the sound generating unit 11 with respect to the ear hook plane may be in the range of 15° to 28°. Preferably, the inclination angle θ of the sound generating unit 11 with respect to the ear hook plane may be in the range of 16° to 25°. More preferably, the inclination angle θ of the sound generating unit 11 with respect to the ear hook plane may be in the range of 18° to 23°.

[0064] Because the ear hook itself is elastic, the inclination angle of the sound generating unit 11 relative to the ear hook plane 12A changes constantly between the worn and unworn state. For example, the inclination angle in the unworn state is smaller than the inclination angle in the worn state. In some embodiments, when the open-type earphone 10 is unworn, the inclination angle of the sound generating unit 11 relative to the ear hook plane may be in the range of 15° to 23°. This allows the ear hook to apply a constant clamping force to the user's ear when the open-type earphone 10 is worn, thereby improving the user's wearing stability without affecting the user's wearing experience. Preferably, when the open-type earphone 10 is unworn, the inclination angle of the sound generating unit 11 relative to the ear hook plane 12A may be in the range of 16.5° to 21°. More preferably, when the open-type earphone 10 is unworn, the inclination angle of the sound generating unit 11 relative to the ear hook plane 12A may be in the range of 18° to 20°.

[0065] If the dimension of the sound generating unit 11 in the thickness direction X is too small, the volume of the front and rear cavities formed by the diaphragm and the housing of the sound generating unit 11 will be too small, limiting the vibration amplitude and making it impossible to provide a high volume. If the dimension of the sound generating unit 11 in the thickness direction X is too large, the end FE of the sound generating unit 11 will not be able to fully abut the edge of the cavity of the concha 102 when worn, making the open-type earphones prone to falling off. The side wall of the sound generating unit 11 facing the user's ear along the coronal axis may have an inclination angle with the ear hook plane, and the distance between the point of the sound generating unit 11 farthest from the ear hook plane and the ear hook plane may be the dimension of the sound generating unit 11 in the thickness direction X. Because the sound generating unit 11 is installed at an angle with respect to the ear hook plane, the point farthest from the ear hook plane of the sound generating unit 11 may refer to the intersection I of the fixed end connected to the ear hook of the sound generating unit 11, the lower wall, and the outer surface. Furthermore, the extent to which the sound generating unit 11 penetrates into the cavity of the concha 11 can be determined based on the distance between the ear hook plane and the point of the sound generating unit 11 closest to the ear hook plane, and the distance between the ear hook plane and the point of the sound generating unit 11 closest to the ear hook plane can be set within an appropriate range, thereby ensuring that the size of the gap formed by the sound generating unit 11 and the cavity of the concha is small and that the user can wear the earphones comfortably. The point of the sound generating unit 11 closest to the ear hook plane may refer to the intersection H of the end FE, upper wall, and inner surface of the sound generating unit 11. In some embodiments, to ensure that the sound generating unit 11 has excellent acoustic output effect and is stable and comfortable to wear, when the open-type earphone is worn, the distance between the ear hooking plane 12A and the point I of the sound generating unit 11 that is farthest from the ear hooking plane 12A may be set to 11.2 mm to 16.8 mm, and the distance between the ear hooking plane 12A and the point H that is closest to the ear hooking plane 12A of the sound generating unit 11 may be set to 3 mm to 5.5 mm. Preferably, the distance between the ear hooking plane 12A and the point I of the sound generating unit 11 that is farthest from the ear hooking plane 12A of the sound generating unit 11 may be set to 12 mm to 15.6 mm, and the distance between the ear hooking plane 12A and the point H that is closest to the ear hooking plane 12A of the sound generating unit 11 may be set to 3.8 mm to 5 mm.More preferably, the distance between point I of the sound generating unit 11 farthest from the ear hook plane 12A and the ear hook plane 12A may be 13 mm to 15 mm, and the distance between point H of the sound generating unit 11 closest to the ear hook plane 12A and the ear hook plane 12A may be 4 mm to 5 mm.

[0066] FIG. 15 is an exemplary schematic view of an open-type earphone according to some other embodiments of the present disclosure.

[0067] 15 , in some embodiments, when the open-type earphone is worn, at least a portion of the sound generating unit 11 can enter the user's cavity of the concha, thereby ensuring the acoustic output effect of the sound generating unit 11 and improving the stability of the open-type earphone when worn due to the force acting on the sound generating unit 11 by the cavity of the concha, and at this time, the side wall of the sound generating unit 11 facing away from the user's head or the side wall facing the user's ear canal can have a certain inclination angle with respect to the surface of the user's pinna. Note that the side wall of the sound generating unit 11 facing away from the user's head or the side wall facing the user's ear canal may be flat or curved. If the side wall is curved, the inclination angle of the side wall of the sound generating unit 11 facing away from the user's head or the side wall facing the user's ear canal with respect to the surface of the user's pinna can be expressed as the inclination angle of a cut surface corresponding to the curved surface at the center position (or a plane that approximately overlaps with a curve formed by the contours of the edges of the curved surface) with respect to the surface of the user's pinna. It should be noted that in some embodiments of the present specification, the user's pinna plane may refer to the plane on which the three points of different regions of the user's pinna (e.g., the pinna apex region, the tragus region, and the antihelix) that are farthest from the user's sagittal plane are located (e.g., the plane passing through points D1, D2, and D3 in FIG. 15).

[0068] Because the projection of the sound generating unit 11 onto the sagittal plane is much smaller than the projection of the pinna onto the sagittal plane, and the cavum concha is a concave cavity of the pinna structure, if the range of the inclination angle of the sound generating unit 11 relative to the pinna surface is small—for example, if the side wall of the sound generating unit 11 facing away from the user's head or the side wall facing the user's ear canal is approximately parallel to the user's pinna surface—the sound generating unit 11 cannot enter the cavum concha, or the gap between the sound generating unit 11 and the cavum concha is large, preventing a good listening experience when the user wears the open-type earphones. Furthermore, because the sound generating unit 11 cannot abut against the edge of the cavum concha, the open-type earphones are likely to fall off while being worn. If the range of the inclination angle of the sound generating unit 11 relative to the pinna surface is large, the sound generating unit 11 will enter the cavum concha too far and press against the user's ear, causing strong discomfort when wearing the open-type earphones for a long period of time. To ensure a user can experience an excellent sound output effect while wearing the open-type earphones and ensure stability and comfort during wearing, the inclination angle of the side wall of sound generating unit 11 facing away from the user's head or the side wall facing the user's ear canal with respect to the user's pinna surface is set to 40° to 60°, allowing a portion or the entire structure of sound generating unit 11 to enter the user's concha. At this time, sound generating unit 11 can have excellent sound output quality, and the contact force between sound generating unit 11 and the user's ear canal is appropriate, thereby enabling the sound generating unit to be more stably worn on the user's ear and providing a comfortable wearing experience. Preferably, in some embodiments, the inclination angle of sound generating unit 11 with respect to the pinna surface may be controlled to a range of 42° to 55° to further optimize the sound output quality and wearing experience when the open-type earphones are worn. More preferably, in some embodiments, the inclination angle of sound generating unit 11 with respect to the pinna surface may be controlled to a range of 44° to 52° to further optimize the sound output quality and wearing experience when the open-type earphones are worn.

[0069] 15 , the auricle surface is inclined upward with respect to the sagittal plane, and the included angle between the auricle surface and the sagittal plane is γ1. In order to allow the end of the sound generating unit 11 to enter the cavity of the concha, which is recessed relative to the auricle, the outer or inner surface of the sound generating unit 11 is inclined downward with respect to the sagittal plane, and the included angle between the outer or inner surface of the sound generating unit 11 and the sagittal plane is γ2. The included angle between the sound generating unit 11 and the auricle surface is the sum of the included angle γ1 between the auricle surface and the sagittal plane and the included angle γ2 between the long axis direction Y of the sound generating unit 11 and the sagittal plane. In other words, the inclination angle of the outer or inner surface of the sound generating unit 11 with respect to the user's auricle surface can be determined by calculating the sum of the included angle γ1 between the auricle surface and the sagittal plane and the included angle γ2 between the outer or inner surface of the sound generating unit 11 and the sagittal plane. The angle between the outer or inner surface of the sound generating unit 11 and the sagittal plane can be considered to be approximately the inclination angle between the long axis direction Y of the sound generating unit 11 and the sagittal plane. In some embodiments, the angle can also be calculated based on the angle between the projection of the pinna surface onto a plane formed by the T axis and the R axis (hereinafter referred to as the TR plane) and the projection of the outer or inner surface of the sound generating unit 11 onto the TR plane. When the outer or inner surface of the sound generating unit 11 is flat, the projection of the outer or inner surface of the sound generating unit 11 onto the TR plane is a straight line, and the angle between this straight line and the projection of the pinna surface onto the TR plane is the inclination angle of the sound generating unit 11 with respect to the pinna surface. When the outer or inner surface of the sound generating unit 11 is curved, the inclination angle of the sound generating unit 11 with respect to the pinna surface can be considered to be approximately the angle between the long axis direction Y of the sound generating unit 11 and the projection of the pinna surface onto the TR plane.

[0070] FIG. 16 is an exemplary schematic view of an open-type earphone according to some other embodiments of the present disclosure.

[0071] 16 , in some embodiments, when the open-type earphone is in a worn state, at least a portion of the sound-generating unit 11 can cover the antihelical region of the user, and the antihelical region may include any one or more of the antihelical region 105, the superior crus of the antihelical region 110, and the inferior crus of the antihelical region 111 shown in FIG. 1 . At this time, the sound-generating unit 11 is located above the cavity of the concha 102 and the ear canal opening, and the ear canal opening of the user is in an open state. In some embodiments, the housing of the sound-generating unit 11 may include at least one sound output hole and a decompression hole, the sound output hole is acoustically coupled to the front cavity of the open-type earphone 10, and the decompression hole is acoustically coupled to the rear cavity of the open-type earphone 10, and the sound output from the sound output hole and the sound output from the decompression hole can be regarded as approximately two point sound sources, and the sound from these two point sound sources has opposite phases and forms a dipole. When a user wears the open-type earphones, the sound output holes are located on a side wall of the sound generating unit 11 that faces toward or is close to the user's ear canal opening, and the decompression holes are located on a side wall of the sound generating unit 11 that faces away from or is facing away from the user's ear canal opening. Here, the housing of the sound generating unit 11 itself acts as a baffle, increasing the difference in acoustic distance between the sound output holes and the decompression holes to the ear canal 101 and increasing the intensity of sound in the ear canal 101. Furthermore, when worn, the inner surface of the sound generating unit 11 abuts against the antihelical region, and the uneven structure of the antihelical region can also act as a baffle. The uneven structure increases the acoustic distance over which sound emitted from the decompression holes is transmitted to the ear canal 101, thereby increasing the difference in acoustic distance between the sound output holes and the decompression holes to the ear canal 101.

[0072] 17 and 18 are exemplary schematic diagrams illustrating how open-type earphones are worn according to some other embodiments of the present specification. As shown in FIGS. 17 and 18, in some embodiments, when the open-type earphones 10 are worn, the sound-generating unit may be substantially parallel to the horizontal or may be at a certain inclination angle. In some embodiments, when the open-type earphones 10 are worn, the sound-generating unit 11 and the user's pinna have a first projection (the rectangular area indicated by the solid-line frame U in FIGS. 17 and 18 is approximately equivalent to the first projection) and a second projection, respectively, onto the sagittal plane of the user's head (for example, see the ST plane in FIGS. 17 and 18). In order to ensure that the entire or partial structure of the sound generating unit 11 covers the user's antihelical region (for example, the position of the antihelix, the triangular fossa, the superior crus of the antihelix, or the inferior crus of the antihelix), the ratio of the distance h6 between the centroid O of the first projection and the highest point A6 of the second projection in the vertical axis direction (for example, the T-axis direction shown in Figures 17 and 18) and the height h of the second projection in the vertical axis direction may be set to 0.25 to 0.4, and the ratio of the distance w6 between the centroid O of the first projection U and the posterior end point B6 of the second projection in the sagittal axis direction (for example, the S-axis direction shown in Figures 17 and 18) and the width w of the second projection in the sagittal axis direction may be set to 0.4 to 0.6.

[0073] Considering that the side walls of the sound generating unit 11 abut against the antihelix region, by abutting the sound generating unit 11 against a larger area of ​​the antihelix region, the uneven structure of the area also functions as a baffle, increasing the acoustic distance over which sound emitted from the decompression hole is transmitted to the ear canal 101, thereby increasing the difference in acoustic distance between the sound emission hole and the decompression hole to the ear canal 101, increasing the intensity of sound in the ear canal 101 and reducing the volume of sound leakage in the far field. Based on this, the sound generating unit 11 can be made to fit as closely as possible to the user's antihelix region in order to achieve both the listening volume of the sound generating unit 11 and the effect of reducing sound leakage and to ensure the sound output quality of the sound generating unit 11. Accordingly, the ratio in the vertical axis direction of the distance h6 between the centroid O of the first projection of the sound generating unit 11 onto the sagittal plane of the user's head and the highest point A6 of the second projection of the user's auricle onto the sagittal plane, and the height h of the second projection in the vertical axis direction, can be controlled to 0.25 to 0.4, and the ratio in the sagittal axis direction of the distance w6 between the centroid O of the first projection of the sound generating unit 11 onto the sagittal plane and the rear end point B6 of the second projection of the user's auricle onto the sagittal plane, and the width w of the second projection in the sagittal axis direction, can be controlled to 0.4 to 0.6. Preferably, in some embodiments, in order to ensure the quality of the acoustic output from the sound generating unit 11 and improve comfort when wearing the open-type earphones, the ratio of the distance h6 in the vertical axis direction between the centroid O of the first projection and the highest point A6 of the second projection to the height h of the second projection in the vertical axis direction may be set to 0.25 to 0.35, and the ratio of the distance w6 in the sagittal axis direction between the centroid O of the first projection and the rear end point B6 of the second projection to the width w of the second projection in the sagittal axis direction may be set to 0.42 to 0.6. More preferably, the ratio of the distance h6 in the vertical axis direction between the centroid O of the first projection and the highest point A6 of the second projection to the height h of the second projection in the vertical axis direction may be 0.25 to 0.34, and the ratio of the distance w6 in the sagittal axis direction between the centroid O of the first projection and the posterior end point B6 of the second projection to the width w of the second projection in the sagittal axis direction may be 0.42 to 0.55.

[0074] Similarly, when the shape and size of users' ears differ, the range of the aforementioned ratio may vary within a certain range. For example, if the user has a long earlobe, the height h of the second projection in the vertical axis direction will be larger than in a general case. In this case, when the user is wearing the open-type earphone 10, the ratio of the distance h6 in the vertical axis direction between the centroid O of the first projection and the highest point A6 of the second projection to the height h of the second projection in the vertical axis direction will be smaller, and may be, for example, 0.2 to 0.35. Similarly, in some embodiments, when the user's helix is ​​curved forward, the width w of the second projection in the sagittal axis direction is smaller than in general, and the distance w6 between the centroid O of the first projection and the rear end point B6 of the second projection in the sagittal axis direction is also smaller. In this case, when the user is wearing the open-type earphone 10, the ratio of the distance w6 between the centroid O of the first projection and the rear end point B6 of the second projection in the sagittal axis direction to the width w of the second projection in the sagittal axis direction may be large, and may be, for example, 0.4 to 0.7.

[0075] In some embodiments, adjusting the distance between the centroid O of the first projection and the contour of the second projection may improve the listening volume, sound leakage reduction effect, and wearing comfort and stability of the sound-generating unit 11. For example, when the sound-generating unit 11 is located on the top of the auricle, the earlobe, the facial area in front of the auricle, or between the inner contour of the auricle and the edge of the cavity of the concha, specifically, if the distance between the centroid O of the first projection and a point in a specific area on the boundary of the second projection is too small and the distance between a point in another area is too large, the antihelix area cannot engage with the sound-generating unit 11 to function as a baffle, which affects the acoustic output effect of the open-type earphone. Furthermore, if the distance between the centroid O of the first projection and a point in a specific region of the boundary of the second projection is too large, a gap may be formed between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna, and the sound emitted from the sound emission hole and the sound emitted from the pressure reduction hole will be acoustically short-circuited in the region between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna, thereby reducing the listening volume at the opening of the user's ear canal, and the larger the region between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna, the more obvious the acoustic short-circuit phenomenon will be. In some embodiments, when the open-type earphone 10 is worn such that at least a portion of the sound generating unit 11 covers the antihelical region of the user, the centroid O of the first projection of the sound generating unit 11 onto the sagittal plane of the user's head may be located within the area surrounded by the outline of the second projection, but the range of the distance between the centroid O of the first projection of the sound generating unit 11 onto the sagittal plane of the user's head and the outline of the second projection is different from when the open-type earphone 10 is worn such that at least a portion of the sound generating unit 11 extends into the cavity of the concha of the user. In the open-type earphones shown in Figures 16 to 18, the structure of at least a portion of the sound generating unit 11 covers the antihelical region, thereby sufficiently exposing the auditory canal and allowing the user to better receive sounds from the external environment.In some embodiments, in order to achieve a balance between the listening volume of the sound generating unit 11, the effect of reducing sound leakage, and the effect of receiving sound from the external environment in this wearing method, and to minimize the area between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna so that the sound generating unit 11 has excellent sound output quality, the distance between the centroid O of the first projection and the contour of the second projection may be in the range of 13 mm to 54 mm. Preferably, the distance between the centroid O of the first projection and the contour of the second projection may be in the range of 18 mm to 50 mm. More preferably, the distance between the centroid O of the first projection and the contour of the second projection may be in the range of 20 mm to 45 mm. In some embodiments, by controlling the range of the distance between the centroid O of the first projection of the sound generating unit 11 onto the sagittal plane of the user's head and the contour of the second projection to 23 mm to 40 mm, the sound generating unit 11 can be positioned approximately in the antihelical region of the user, and at least a portion of the sound generating unit 11 forms a baffle with the antihelical region, increasing the acoustic distance over which sound emitted from the decompression hole is transmitted to the ear canal 101, thereby increasing the difference in acoustic distance between the sound emission hole and the decompression hole to the ear canal 101, thereby increasing the intensity of the sound in the ear canal 101 and reducing the volume of sound leakage in the far field.

[0076] In some embodiments, to avoid the problem that the distance between the centroid O of the first projection and the projection of the first part 121 of the earhook 12 onto the sagittal plane is too large, resulting in unstable wearing and a large area between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna, and the problem that the distance between the centroid O of the first projection and the projection of the first part 121 of the earhook 12 onto the sagittal plane is too small, resulting in low comfort when worn and inability to engage with the antihelix area to achieve excellent sound output quality, the range of the distance between the centroid O of the first projection of the sound generating unit 11 onto the sagittal plane of the user and the projection of the first part 121 of the earhook 12 onto the sagittal plane can be controlled to be between 8 mm and 45 mm. As can be seen, by controlling this distance to 8mm to 45mm, the first part 121 of the ear hook fits well to the posterior medial surface of the user's pinna when worn, and the sound generating unit 11 is ensured to be positioned exactly in the antihelical area of ​​the user, so that the sound generating unit 11 forms a baffle with the antihelical area, increasing the acoustic distance over which the sound emitted from the decompression hole is transmitted to the ear canal 101, thereby increasing the difference in acoustic distance between the sound emission hole and the decompression hole to the ear canal 101, thereby increasing the intensity of the sound in the ear canal 101 and reducing the volume of sound leakage in the far field. Furthermore, by controlling the distance between the centroid O of the first projection of the sound generating unit 11 onto the user's sagittal plane and the projection of the first earhook portion 121 onto the sagittal plane to a range of 8 mm to 45 mm, the area between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna can be minimized, thereby reducing the area of ​​acoustic short-circuiting around the sound generating unit 11 and increasing the listening volume at the user's ear canal. Preferably, in some embodiments, to further improve the stability of the open-type earphone when worn, the distance between the centroid O of the first projection of the sound generating unit 11 onto the user's sagittal plane and the projection of the first earhook portion 121 onto the sagittal plane may be set to a range of 10 mm to 41 mm. More preferably, the distance between the centroid O of the first projection of the sound generating unit 11 onto the user's sagittal plane and the projection of the first earhook portion 121 onto the sagittal plane may be set to a range of 13 mm to 37 mm. More preferably, the range of the distance between the centroid O of the first projection of the sound generating unit 11 onto the sagittal plane of the user and the projection of the first part 121 of the ear hook onto the sagittal plane may be 15 mm to 33 mm.More preferably, the range of the distance between the centroid O of the first projection of the sound generating unit 11 onto the sagittal plane of the user and the projection of the first part 121 of the ear hook onto the sagittal plane may be 20 mm to 25 mm.

[0077] In some embodiments, the earhook 12 may be elastic and may deform uniformly when worn relative to when not worn. For example, in some embodiments, the distance between the centroid of the first projection of the sound generating unit 11 onto the user's sagittal plane and the projection of the first portion 121 of the earhook onto the sagittal plane may be greater when worn than when not worn. For example, in some embodiments, when the open-type earphone 10 is not worn, the distance between the centroid of the projection of the sound generating unit 11 onto a specific reference plane and the projection of the first portion 121 of the earhook onto the specific reference plane may range from 6 mm to 40 mm. Preferably, the distance between the centroid of the projection of the sound generating unit onto the specific reference plane and the projection of the first portion 121 of the earhook onto the specific reference plane may range from 9 mm to 32 mm. As can be understood, in some embodiments, the distance between the centroid of the projection of the sound generating unit 11 onto a specific reference plane and the projection of the first earhook portion 121 onto the specific reference plane is set slightly smaller when the earphone is not being worn than when it is being worn, so that when the open-type earphone 10 is being worn, the earhook and sound generating unit can apply a certain clamping force to the user's ear, thereby improving the stability of the earphone when worn by the user without affecting the user's wearing experience. For details regarding the specific reference plane, please refer to the contents elsewhere in this specification, and further explanation will be omitted here.

[0078] In some embodiments, when the open-type earphone 10 is worn such that at least a portion of its sound-generating unit 11 covers the antihelix region of the user, the centroid O of the first projection of the sound-generating unit 11 onto the user's sagittal plane may be located outside the projection area of ​​the user's ear canal opening onto the sagittal plane, thereby maintaining a sufficient open state for the ear canal opening to better receive sound information from the external environment. The position of the centroid O of the first projection is related to the size of the sound-generating unit. If the size of the sound-generating unit 11 in the major axis direction Y or the minor axis direction Z is too small, the volume of the sound-generating unit 11 will be relatively small, and the area of ​​the diaphragm installed inside the sound-generating unit 11 will also be relatively small. This will cause the diaphragm to press the air inside the housing of the sound-generating unit 11 and generate sound with low efficiency, which will affect the acoustic output effect of the open-type earphone. If the dimension of the sound generating unit 11 in the major axis direction Y is too large, the sound generating unit 11 may extend beyond the auricle, and the inner contour of the auricle may not be able to support and restrict the sound generating unit 11, making it prone to coming off when worn. Also, if the dimension of the sound generating unit 11 in the major axis direction Y is too small, a gap may be formed between the end FE of the sound generating unit 11 and the inner contour 1014 of the auricle, causing an acoustic short-circuit between the sound emitted from the sound output hole and the sound emitted from the pressure reduction hole in the area between the end FE of the sound generating unit 11 and the inner contour 1014 of the auricle. This reduces the listening volume at the opening of the user's ear canal, and the larger the area between the end FE of the sound generating unit 11 and the inner contour 1014 of the auricle, the more pronounced the acoustic short-circuit phenomenon becomes. If the dimension of the sound generating unit 11 in the minor axis direction Z is too large, the sound generating unit 11 may cover the opening of the user's ear canal, affecting the user's acquisition of audio information from the external environment. In some embodiments, to ensure that the sound generating unit has excellent sound output quality, when the open-type earphone is in a worn state, the distance between the centroid of the first projection of the sound generating unit onto the sagittal plane of the user and the centroid of the projection of the user's ear canal opening onto the sagittal plane may be 25 mm or less. Preferably, the distance between the centroid of the first projection of the sound generating unit onto the sagittal plane of the user and the centroid of the projection of the user's ear canal opening onto the sagittal plane may be 5 mm to 23 mm.More preferably, the distance between the centroid of the first projection of the sound generating unit onto the user's sagittal plane and the centroid of the projection of the user's auditory canal opening onto the sagittal plane may be 8 mm to 20 mm. In some embodiments, by controlling the distance between the centroid of the first projection of the sound generating unit onto the user's sagittal plane and the centroid of the projection of the user's auditory canal opening onto the sagittal plane to 10 mm to 17 mm, the centroid O of the first projection can be located approximately in the antihelical region of the user, thereby not only ensuring that sound output from the sound generating unit is effectively transmitted to the user, but also allowing the auditory canal opening to remain sufficiently open to acquire audio information from the external environment, and allowing at least a portion of the sound generating unit 11 to receive a force that prevents its downward movement due to the inner contour of the pinna, thereby improving the stability of the open-type earphone 10 when worn to some extent. Note that the shape of the projection of the auditory canal opening onto the sagittal plane can be considered to be approximately elliptical, and accordingly, the centroid of the projection of the auditory canal opening onto the sagittal plane may be the geometric center of the ellipse.

[0079] In some embodiments, when the open-type earphone 10 is worn and at least a portion of the sound generating unit 11 covers the user's antihelix region, the distance between the centroid O of the first projection U and the centroid W of the projection of the battery housing 13 onto the sagittal plane changes constantly for a wearing style in which at least a portion of the sound generating unit 11 enters the user's cavity of the concha. As with a wearing style in which at least a portion of the sound generating unit 11 enters the user's cavity of the concha, as shown in FIG. 16 , to ensure excellent stability and comfort when the user wears the open-type earphone 10, the distance (sixth distance) between the centroid O of the projection of the sound generating unit 11 onto the sagittal plane and the centroid W of the projection of the battery housing 13 onto the sagittal plane may be controlled to a range of 20 mm to 31 mm. Preferably, the range of the distance between the centroid O of the projection of the sound generating unit 11 onto the sagittal plane and the centroid W of the projection of the battery housing 13 onto the sagittal plane may be set to 22 mm to 28 mm. More preferably, the range of the distance between the centroid O of the projection of the sound generating unit 11 onto the sagittal plane and the centroid W of the projection of the battery housing 13 onto the sagittal plane may be 23 mm to 26 mm. Because the earhook itself has elasticity, the distance between the centroid O of the corresponding projection of the sound generating unit 11 and the centroid W of the corresponding projection of the battery housing 13 changes depending on whether the open-type earphone 10 is being worn or not. In some embodiments, the range of the distance (fifth distance) between the centroid O of the projection of the sound generating unit 11 onto a specific reference plane and the centroid W of the projection of the battery housing 13 onto the specific reference plane when the earphone 10 is not being worn may be 16.7 mm to 25 mm. Preferably, the range of the distance between the centroid O of the projection of the sound generating unit 11 onto the specific reference plane and the centroid W of the projection of the battery housing 13 onto the specific reference plane when the earphone 10 is not being worn may be 18 mm to 23 mm. More preferably, when not worn, the range of the distance between the centroid O of the projection of sound generating unit 11 onto a specific reference plane and the centroid W of the projection of battery housing 13 onto a specific reference plane may be 19.6 mm to 21.8 mm.

[0080] For example, taking the specific reference plane as the sagittal plane, in some embodiments, the change in the distance between the centroid O of the projection corresponding to the sound generating unit 11 and the centroid W of the projection corresponding to the battery housing 13 when the open-type earphone 10 is worn and when it is not worn (the ratio of the difference between the fourth distance and the third distance to the third distance) can reflect the flexibility of the earhook. As can be seen, if the earhook is too flexible, the overall structure and shape of the open-type earphone 10 will be unstable, and the sound generating unit 11 and the battery housing 13 will not be firmly supported, and the earhook will be less stable when worn and will easily come off. Considering that the earhook needs to be hung on the connection point between the auricle and the head, if the earhook is too inflexible, the open-type earphone 10 will be less likely to deform, and when a user wears the open-type earphone, the earhook will abut against and press against the area between the human ear and / or head, thereby affecting wearing comfort. Based on this, in order to ensure that a user has excellent stability and comfort when wearing the open-type earphone 10, in some embodiments, the ratio of the change in the distance between the centroid O of the first projection U and the centroid W of the projection of the battery compartment 13 onto the sagittal plane between when the open-type earphone 10 is worn and when it is not worn to the distance between the centroid O of the first projection U and the centroid W of the projection of the battery compartment 13 onto the sagittal plane when the open-type earphone 10 is not worn may be in the range of 0.3 to 0.7. Preferably, the ratio of the change in the distance between the centroid O of the projection of the sound generation unit 11 onto the sagittal plane and the centroid W of the projection of the battery compartment 13 onto the sagittal plane between when the open-type earphone 10 is worn and when it is not worn to the distance between the centroid O of the sound generation unit 1 ... battery compartment 13 when the open-type earphone 10 is not worn may be in the range of 0.45 to 0.68. For details regarding specific reference planes, reference may be made to other parts of this specification, such as Figures 10A and 10 and their corresponding contents.

[0081] In addition, while ensuring that the auditory canal is not blocked, it is necessary to consider making the dimensions of the baffle formed by the sound generating unit 11 and the antihelix region (particularly, the dimensions of the first projection along the longitudinal axis direction Y) as large as possible, and since the overall volume of the sound generating unit 11 should not be too large or too small, it is necessary to give special consideration to the mounting angle of the sound generating unit 11 relative to the antihelix region, assuming that the overall volume or shape of the sound generating unit 11 is specific.

[0082] 19A to 19C are schematic diagrams illustrating different exemplary engagement positions between the open-type earphone according to the present specification and a user's ear canal. As shown in FIG. 19A, in some embodiments, when the sound generating unit 11 has a substantially rectangular parallelepiped structure, the upper wall 111 or the lower wall 112 of the sound generating unit 11 may be parallel to a horizontal plane (e.g., the ground) in the worn state. As shown in FIGS. 19B and 19C, in some embodiments, the upper wall 111 or the lower wall 112 of the sound generating unit 11 may be inclined at a certain angle relative to the horizontal plane. As shown in FIGS. 19A and 19B, when the sound generating unit 11 is inclined obliquely upward relative to the horizontal direction, if the inclination angle of the upper wall 111 or the lower wall 112 of the sound generating unit 11 relative to the horizontal plane is too large, the sound emission hole of the sound generating unit 11 will be far away from the ear canal opening, which will affect the listening volume at the user's ear canal opening. 19A and 19C , when the sound generating unit is tilted diagonally downward relative to the horizontal, if the inclination angle of the upper wall 111 or the lower wall 112 of the sound generating unit 11 relative to the horizontal plane is too large, the sound generating unit 11 will cover the ear canal, affecting the user's acquisition of sound information from the external environment. Based on the above problem, in some embodiments, to ensure a good listening experience at the user's ear canal while maintaining a sufficient open state of the ear canal when the open-type earphone 10 is worn, the inclination angle of the upper wall 111 or the lower wall 112 of the sound generating unit 11 between the projection onto the sagittal plane and the horizontal may be 40° or less. Preferably, the inclination angle of the upper wall 111 or the lower wall 112 of the sound generating unit 11 between the projection onto the sagittal plane and the horizontal may be 38° or less when the open-type earphone 10 is worn. More preferably, when the open-type earphone 10 is worn, the angle of inclination between the projection of the upper wall 111 or the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the horizontal direction may be 25° or less. More preferably, when the open-type earphone 10 is worn, the angle of inclination between the projection of the upper wall 111 or the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the horizontal direction may be 10° or less.

[0083] The angle of inclination of the upper wall 111 of the sound generating unit 11 between the projection onto the sagittal plane and the horizontal direction may be the same as or different from the angle of inclination of the lower wall 112 between the projection onto the sagittal plane and the horizontal direction. For example, when the upper wall 111 of the sound generating unit 11 is parallel to the lower wall 112, the angle of inclination of the upper wall 111 between the projection onto the sagittal plane and the horizontal direction is the same as the angle of inclination of the lower wall 112 between the projection onto the sagittal plane and the horizontal direction. Furthermore, when the upper wall 111 of the sound generating unit 11 is not parallel to the lower wall 112, or when one of the upper wall 111 or the lower wall 112 is a flat wall and the other is a non-flat wall (e.g., a curved wall), the angle of inclination of the upper wall 111 between the projection onto the sagittal plane and the horizontal direction may be different from the angle of inclination of the lower wall 112 between the projection onto the sagittal plane and the horizontal direction. Furthermore, if the upper wall 111 or the lower wall 112 is a curved or uneven surface, the projection of the upper wall 111 or the lower wall 112 onto the sagittal plane may be a curve or a broken line, and in this case, the inclination angle between the projection of the upper wall 111 onto the sagittal plane and the horizontal direction may be the angle between the tangent of the curve or broken line at the point where the distance to the ground is maximum and the horizontal direction, and the inclination angle between the projection of the lower wall 112 onto the sagittal plane and the horizontal direction may be the angle between the tangent of the curve or broken line at the point where the distance to the ground is minimum and the horizontal direction.

[0084] The structure of the entire or part of the sound generating unit 11 can cover the antihelix region to form a baffle, and the listening effect when a user is wearing the open-type earphone 10 is related to the distance between the sound output hole and the decompression hole of the sound generating unit 11. The closer the distance between the sound output hole and the decompression hole, the more the sounds emitted from the sound output hole and the decompression hole are canceled out at the user's ear canal, and the lower the listening volume at the user's ear canal. The distance between the sound output hole and the decompression hole is related to the dimensions of the sound generating unit 11. For example, the sound output hole may be located on a side wall of the sound generating unit 11 that is close to the user's ear canal (e.g., the lower wall or inner surface), and the decompression hole may be located on a side wall of the sound generating unit 11 that is away from the user's ear canal (e.g., the upper wall or outer surface). Therefore, the dimensions of the sound-generating unit affect the listening volume at the opening of the user's ear canal, and if the dimensions are too large, they will restrict most of the area of ​​the ear unit, affecting the user's wearing comfort and convenience when carrying them. In some embodiments, the dimension of the sound-generating unit 11 along the minor axis direction Z can be reflected by the distance between the midpoint of the projection of the upper wall 111 and the lower wall 112 of the sound-generating unit 11 onto the sagittal plane and the highest point of the second projection. Based on this, to ensure that the open-type earphone 10 does not block the user's ear canal and to improve the listening effect of the open-type earphone 10, in some embodiments, when the open-type earphone 10 is worn such that at least a portion of the sound-generating unit 11 covers the antihelix region of the user, the range of the distance between the midpoint of the projection of the upper wall 111 of the sound-generating unit 11 onto the sagittal plane and the highest point of the second projection may be 12 mm to 24 mm, and the range of the distance between the midpoint of the projection of the lower wall 112 of the sound-generating unit 11 onto the sagittal plane and the highest point of the second projection is 22 mm to 34 mm. Preferably, the range of the distance between the midpoint of the projection of the upper wall 111 of the sound-generating unit 11 onto the sagittal plane and the highest point of the second projection is 12.5 mm to 23 mm, and the range of the distance between the midpoint of the projection of the lower wall 112 of the sound-generating unit 11 onto the sagittal plane and the highest point of the second projection is 22.5 mm to 33 mm. In addition, if the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane is a curved or broken line, the midpoint of the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane can be selected using the following exemplary method.Two points on the projection of the upper wall 111 onto the sagittal plane that are the greatest distance apart along the long axis direction Y are selected to draw a line segment, and the midpoint of the line segment is selected to draw a perpendicular bisector. The point where the perpendicular bisector intersects with the projection is the midpoint of the projection of the upper wall 111 onto the sagittal plane of the sound-generating unit 11. In some alternative embodiments, the point on the projection of the upper wall 111 onto the sagittal plane that is the smallest distance from the highest point of the second projection may be selected as the midpoint of the projection of the upper wall 111 onto the sagittal plane of the sound-generating unit 11. The midpoint of the projection of the lower wall 112 of the sound-generating unit 11 onto the sagittal plane can be selected as described above. For example, the point on the projection of the lower wall 112 onto the sagittal plane that is the greatest distance from the highest point of the second projection may be selected as the midpoint of the projection of the lower wall 112 of the sound-generating unit 11 onto the sagittal plane.

[0085] In some embodiments, the dimension of the sound-generating unit 11 along the short-axis direction Z can be reflected by the distance between the midpoint of the projection of the upper wall 111 and the lower wall 112 of the sound-generating unit 11 onto the sagittal plane and the projection of the apex of the ear hook onto the sagittal plane. To ensure that the open-type earphone 10 does not block the user's ear canal and to improve the listening effect of the open-type earphone 10, in some embodiments, the range of the distance between the midpoint of the projection of the upper wall 111 of the sound-generating unit 11 onto the sagittal plane and the projection of the apex of the ear hook onto the sagittal plane may be set to 13 mm to 20 mm, and the range of the distance between the midpoint of the projection of the lower wall 112 of the sound-generating unit 11 onto the sagittal plane and the projection of the apex of the ear hook onto the sagittal plane is set to 22 mm to 36 mm. Preferably, the range of the distance between the midpoint of the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane and the projection of the apex of the ear loop onto the sagittal plane may be 14 mm to 19.5 mm, and the range of the distance between the midpoint of the projection of the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the projection of the apex of the ear loop onto the sagittal plane may be 22.5 mm to 35 mm. More preferably, the range of the distance between the midpoint of the projection of the upper wall 111 of the sound generating unit 11 onto the sagittal plane and the projection of the apex of the ear loop onto the sagittal plane may be 15 mm to 18 mm, and the range of the distance between the midpoint of the projection of the lower wall 112 of the sound generating unit 11 onto the sagittal plane and the projection of the apex of the ear loop onto the sagittal plane is 26 mm to 30 mm.

[0086] 19A , in some embodiments, the upper wall 111 or the lower wall 112 of the sound-generating unit 11 may be parallel or approximately parallel to the horizontal plane when worn, and the end FE of the sound-generating unit 11 is located between the inner contour 1014 of the pinna and the edge of the cavity of the concha 102. That is, the midpoint C3 of the projection of the end FE of the sound-generating unit 11 onto the sagittal plane is located between the projection of the inner contour 1014 of the pinna onto the sagittal plane and the projection of the edge of the cavity of the concha 102 onto the sagittal plane. As shown in FIGS. 19B and 19C , in some embodiments, the upper wall 111 or the lower wall 112 of the sound-generating unit 11 may be inclined at a certain angle with respect to the horizontal plane when worn. As shown in FIG. 19B , the end FE of the sound-generating unit 11 is inclined toward the top of the pinna with respect to the fixed end of the sound-generating unit 11, and the end FE of the sound-generating unit 11 abuts against the inner contour 1014 of the pinna. 19C , the fixed end of the sound-generating unit 11 is inclined toward the region of the top of the pinna with respect to the end FE of the sound-generating unit 11, and the end FE of the sound-generating unit 11 is located between the edge of the cavity of the concha 102 and the inner contour 1014 of the pinna; that is, the midpoint C3 of the projection of the end FE of the sound-generating unit 11 onto the sagittal plane is located between the projection of the inner contour 1014 of the pinna onto the sagittal plane and the projection of the edge of the cavity of the concha 102 onto the sagittal plane. In some embodiments, the midpoint C3 of the projection of the end FE of the sound-generating unit 11 onto the sagittal plane is located between the projection of the inner contour 1014 of the pinna onto the sagittal plane and the projection of the edge of the cavity of the concha 102 onto the sagittal plane. When the open-type earphone 10 is worn, if the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane is too small relative to the projection of the edge of the cavity of the concha 102 onto the sagittal plane, the end FE of the sound generating unit 11 will not be able to abut against the inner contour 1014 of the pinna, will not be able to serve as a positional restriction for the sound generating unit 11, and will be prone to coming off. If the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane is too large relative to the projection of the edge of the cavity of the concha 102 onto the sagittal plane, the sound generating unit 11 will press against the inner contour 1014 of the pinna, causing discomfort to the user when worn for an extended period of time. To ensure a good listening experience for the open-type earphone 10 and ensure comfort and stability when worn by the user, in some embodiments, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane is set to 15 mm or less.Preferably, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane is 13 mm or less. More preferably, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane is 11 mm or less. In addition, there is a gap between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna, and the sound emitted from the sound output hole and the sound emitted from the pressure reducing hole will be acoustically short-circuited in the area between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna, which will reduce the listening volume at the opening of the user's ear canal. Considering this, the larger the area between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna, the more obvious the acoustic short-circuit phenomenon will be. In order to ensure the listening volume when the user is wearing the open-type earphone 10, in some embodiments, the end FE of the sound generating unit 11 is abutted against the inner contour 1014 of the pinna, thereby blocking the acoustic short-circuit path between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna, thereby increasing the listening volume at the opening of the ear canal.

[0087] Note that, when the projection of the end portion FE of the sound generating unit 11 onto the sagittal plane is a curved line or a broken line, the midpoint C3 of the projection of the end portion FE of the sound generating unit 11 onto the sagittal plane can be selected by the following exemplary method: Two points on the projection of the end portion FE onto the sagittal plane that are the greatest distance apart in the minor axis direction Z are selected to draw a line segment, and the midpoint of the line segment is selected to draw a perpendicular bisector, and the point where the perpendicular bisector intersects with the projection becomes the midpoint C3 of the projection of the end portion FE of the sound generating unit 11 onto the sagittal plane. In some embodiments, when the end portion FE of the sound generating unit 11 is a curved surface, the midpoint of the tangent of the projection that is parallel to the minor axis direction Z may be selected to be the midpoint of the projection of the end portion FE of the sound generating unit 11 onto the sagittal plane.

[0088] Furthermore, in some embodiments of the present specification, the distance between the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane may refer to the minimum distance between the midpoint of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection area of ​​the edge of the cavity of the concha onto the sagittal plane. Alternatively, the distance between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane may refer to the distance on the sagittal axis between the midpoint C3 of the projection of the end FE of the sound generating unit 11 onto the sagittal plane and the projection of the edge of the cavity of the concha onto the sagittal plane.

[0089] In some embodiments, when a user is wearing the open-type earphones shown in Figures 16 and 18, the upper wall 111 of the sound-generating unit 11 forms a certain angle with the second portion 122 of the earhook to allow a portion or the entire structure of the sound-generating unit to cover the antihelix region. This is similar to the principle of at least a portion of the sound-generating unit entering the cavity of the concha, and as shown in Figure 14A, this angle can be expressed as the angle β between the projection of the upper wall 111 of the sound-generating unit 11 onto the sagittal plane and a tangent 126 to the projection of the second portion 122 of the earhook and the upper wall 111 of the sound-generating unit 11 onto the sagittal plane. Specifically, the upper wall of the sound-generating unit 11 and the second portion 122 of the earhook have a connection point, and the projection of this connection point onto the sagittal plane is point U. A tangent 126 to the projection of the second portion 122 of the earhook onto the sagittal plane passes through point U. If the upper wall 111 is a curved surface, the projection of the upper wall 111 onto the sagittal plane may be a curved line or a broken line. In this case, the angle between the projection of the upper wall 111 onto the sagittal plane and the tangent line 126 may be the angle between the tangent line 126 and the tangent line at the point where the distance to the ground of the curved line or broken line is greatest. In some embodiments, if the upper wall 111 is a curved surface, a tangent line of the projection parallel to the long axis direction Y may be selected, and the angle between the tangent line and the horizontal direction may represent the angle between the projection of the upper wall 111 onto the sagittal plane and the tangent line 126. In some embodiments, the included angle β may be within a range of 45° to 110°. Preferably, the included angle β may be within a range of 60° to 100°. More preferably, the included angle β may be within a range of 80° to 95°.

[0090] The human head can be considered to have a roughly spherical structure, and the pinna is a structure that protrudes outward relative to the head. When a user wears the open-type earphone, a portion of the ear hook 12 abuts against the user's head, causing the sound-generating unit 11 to contact the antihelix region. In some embodiments, when the open-type earphone is worn, the sound-generating unit may have a certain inclination angle with respect to the ear hook plane. The inclination angle can be expressed as the included angle between the corresponding plane of the sound-generating unit 11 and the ear hook plane. In some embodiments, the corresponding plane of the sound-generating unit 11 may include an outer surface and an inner surface. In some embodiments, if the outer surface or inner surface of the sound-generating unit 11 is curved, the corresponding plane of the sound-generating unit 11 may refer to a cut plane corresponding to the curved surface at the center, or a plane that approximately overlaps with a curve surrounded by the outline of the edge of the curved surface. Here, taking the inner surface of the sound generating unit 11 as an example, the included angle formed by this surface and the ear hook plane is the inclination angle of the sound generating unit 11 with respect to the ear hook plane.

[0091] If the angle is too large, the contact area between the sound generating unit 11 and the user's antihelix region is small, making it impossible to provide sufficient contact resistance, and the sound generating unit 11 is likely to come off while being worn by the user. Furthermore, if the dimensions of the baffle formed by at least a portion of the sound generating unit 11 covering the antihelix region (particularly the dimensions of the sound generating unit 11 along the longitudinal axis direction Y) are too small, the difference in acoustic distance to the ear canal 101 between the sound output hole and the decompression hole is small, affecting the listening volume at the opening of the user's ear canal. Furthermore, if the dimensions of the sound generating unit 11 along the longitudinal axis direction Y are too small, the area between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna is large, and an acoustic short circuit occurs between the sound emitted from the sound output hole and the sound emitted from the decompression hole in the area between the end FE of the sound generating unit 11 and the inner contour 1014 of the pinna, resulting in a poor listening volume at the opening of the user's ear canal. Considering the reduction in listening volume, to ensure a good listening experience when a user wears the open-type earphone 10 and to ensure stability and comfort during wearing, for example, in some embodiments, the open-type earphone is worn such that at least a portion of the sound generating unit 11 covers the user's antihelical region. When the open-type earphone is worn, the inclination angle between the corresponding plane of the sound generating unit 11 and the ear-hook plane may be set to 8° or less. This increases the contact area between the sound generating unit 11 and the user's antihelical region, improving wearing stability. Furthermore, most of the structure of the sound generating unit 11 is located in the antihelical region, leaving the ear canal completely open, allowing the user to receive sound from the external environment. Preferably, the inclination angle between the corresponding plane of the sound generating unit 11 and the ear-hook plane may be set to 2° to 7°. More preferably, the inclination angle between the corresponding plane of the sound generating unit 11 and the ear-hook plane may be set to 3° to 6°.

[0092] Because the ear hook itself is elastic, the inclination angle of the sound generating unit relative to the ear hook plane changes constantly between the worn and unworn state. For example, the inclination angle in the unworn state is smaller than the inclination angle in the worn state. In some embodiments, when the open-type earphone is unworn, the inclination angle of the sound generating unit relative to the ear hook plane may range from 0° to 6°. By making the inclination angle of the sound generating unit relative to the ear hook plane slightly smaller in the unworn state than in the worn state, the ear hook can apply a certain clamping force to the user's ear (e.g., the antihelix region) when the open-type earphone 10 is worn, thereby improving the user's wearing stability without affecting the user's wearing experience. Preferably, the inclination angle of the sound generating unit relative to the ear hook plane may range from 1° to 6° in the unworn state. More preferably, the inclination angle of the sound generating unit relative to the ear hook plane may range from 2° to 5° in the unworn state.

[0093] If the dimensions of the sound generating unit 11 in the thickness direction X are too small, the volumes of the front and rear cavities formed by the diaphragm and the housing of the sound generating unit 11 are too small, limiting the amplitude of vibration and preventing a high volume from being provided. If the dimensions of the sound generating unit 11 in the thickness direction X are too large, the overall dimensions or weight of the sound generating unit 11 become large when worn, affecting stability and comfort when worn. In some embodiments, to ensure that the sound generating unit 11 provides an excellent acoustic output effect and ensure stability and comfort when worn, in some embodiments, the wearing method of the open-type earphone is such that at least a portion of the sound generating unit covers the user's antihelix region. When the open-type earphone is worn, the distance between the point farthest from the ear hook plane of the sound generating unit and the ear hook plane may be 12 mm to 19 mm, and the distance between the point closest to the ear hook plane of the sound generating unit and the ear hook plane may be 3 mm to 9 mm. Preferably, when the open-type earphone is worn, the distance between the point of the sound generating unit farthest from the earhook plane and the earhook plane may be 13.5 mm to 17 mm, and the distance between the point of the sound generating unit closest to the earhook plane and the earhook plane may be 4.5 mm to 8 mm. More preferably, when the open-type earphone is worn, the distance between the point of the sound generating unit farthest from the earhook plane and the earhook plane may be 14 mm to 17 mm, and the distance between the point of the sound generating unit closest to the earhook plane and the earhook plane may be 5 mm to 7 mm. In some embodiments, by controlling the distance between the point of the sound generating unit farthest from the earhook plane and the earhook plane to be 12 mm to 19 mm and the distance between the point of the sound generating unit closest to the earhook plane and the earhook plane to be 3 mm to 9 mm, it is possible to limit the dimensions of the sound generating unit along the thickness direction X and the longitudinal direction Y, which allows at least a portion of the sound generating unit to engage with the user's antihelix region to form a baffle and ensures excellent wearing comfort and stability of the open-type earphone.The open-type earphones shown in Figures 16 and 18 have almost the same overall structure as the open-type earphones shown in Figures 14A and 14B. For details regarding the inclination angle of the sound generating unit of the open-type earphones shown in Figures 16 and 18 relative to the ear hook plane and the distance between the ear hook plane and the point of the sound generating unit 11 farthest from the ear hook plane, please refer to Figures 14A and 14B.

[0094] In some embodiments, the open-type earphone 10 is worn such that at least a portion of the sound generating unit covers the user's antihelix region. When the open-type earphone is worn, at least a portion of the sound generating unit 11 receives a force from the antihelix, preventing it from moving downward. This ensures the sound output effect of the sound generating unit 11, and the force exerted on the sound generating unit 11 by the antihelix region improves the stability of the open-type earphone when worn. In this case, the sound generating unit 11 may be inclined at a certain angle relative to the pinna surface of the user. If the inclination angle of the sound generating unit 11 relative to the pinna surface is large, the sound generating unit 11 will press against the antihelix region, causing the user to feel very uncomfortable when wearing the open-type earphone for a long period of time. Therefore, to ensure excellent stability and comfort when the user wears the open-type earphone and to ensure that the sound generating unit 11 has an excellent sound output effect, the inclination angle of the sound generating unit of the open-type earphone relative to the pinna surface when worn may be in the range of 5° to 40°. Preferably, in some embodiments, to further optimize the sound output quality and wearing experience when the open-type earphone is worn, the inclination angle of the sound generating unit with respect to the pinna surface may be controlled to a range of 8° to 35°. More preferably, the inclination angle of the sound generating unit with respect to the pinna surface is controlled to a range of 15° to 25°. Note that the inclination angle of the side wall of the sound generating unit 11 facing away from the user's head or the side wall facing the user's ear canal with respect to the user's pinna surface may be the sum of the included angle γ1 between the pinna surface and the sagittal plane and the included angle γ2 between the side wall of the sound generating unit 11 facing away from the user's head or the side wall facing the user's ear canal with the sagittal plane. For details about the inclination angle of the sound generating unit with respect to the pinna surface, please refer to other sections of the embodiments in this specification, such as FIG. 15 and its related explanations.

[0095] Having described the basic concepts above, it will be apparent to those skilled in the art that the detailed disclosure above is provided by way of example only and is not intended to limit the scope of the present application. Although not expressly described herein, those skilled in the art may make various changes, improvements, and modifications to the present application. These changes, improvements, and modifications are intended to be suggested by the present application and are therefore within the spirit and scope of the exemplary embodiments of the present application.

[0096] Furthermore, certain terms are used herein to describe embodiments of the present application. For example, "one embodiment," "one embodiment," and / or "some embodiments" refer to particular features, structures, or characteristics associated with at least one embodiment of the present application. Therefore, it is emphasized and understood that two or more references to "one embodiment" or "one embodiment" or "one alternative embodiment" in different parts of this specification do not necessarily refer to the same embodiment. Furthermore, particular features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

[0097] Similarly, in the foregoing description of embodiments of the present application, various features may be grouped together in a single embodiment, drawing, or description for the purpose of simplifying the description of the present application and facilitating an understanding of one or more embodiments of the present invention. However, this method of disclosure should not be interpreted as reflecting an intention that the present subject matter requires more features than are recited in each claim. Rather, an embodiment may include fewer than all features of a single embodiment disclosed above.

[0098] Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the present embodiments. Other variations may be within the scope of the present application. Thus, by way of example, and not of limitation, alternative configurations of the present embodiments may be considered consistent with the teachings of the present application. Accordingly, the present embodiments are not limited to the embodiments expressly introduced and described herein. [Explanation of symbols]

[0099] 10 Open-back earphones 11, 11A, 11B, 11C Sound generating section 12 Hanging structure 121 First Part 122 Second Part 402 Similar cavity structure 403 Leakage Structure 100 ears 101 External auditory canal 102 Concha cavity 103 Concha navicular 104 Triangular fossa 105 Antihelix 106 Scaphoid fossa 107 Earrings 108 Earlobe 109 Helical foot 1013 Outer contour 1014 Inner contour

Claims

1. a sound generating unit; an ear hook including a first part and a second part connected in order, the first part being hooked between the user's auricle and the head, the second part extending toward the anterior outer surface of the auricle, and connected to the sound generating unit, thereby attaching the sound generating unit to a position near the ear canal without blocking the ear canal opening; the sound generating unit and the auricle each have a first projection and a second projection on a sagittal plane, a centroid of the first projection having a first distance in a vertical axis direction from a highest point of the second projection, a ratio of the first distance to a height of the second projection in the vertical axis direction being 0.25 to 0.6, the centroid of the first projection having a second distance in a sagittal axis direction from a posterior end point of the second projection, and a ratio of the second distance to a width of the second projection in the sagittal axis direction being 0.4 to 0.7; At least a portion of the sound generating unit is inserted into the cavity of the concha, An open-type earphone, wherein the distance between the centroid of the first projection and the outline of the second projection ranges from 23 mm to 52 mm.

2. An open-type earphone as described in claim 1, wherein the ratio of the first distance to the height of the second projection in the vertical axis direction is 0.35 to 0.6, and the ratio of the second distance to the width of the second projection in the sagittal axis direction is 0.4 to 0.

65.

3. 3. The open-type earphone of claim 2, wherein the range of the distance between the centroid of the first projection and the projection of the first portion of the earhook onto the sagittal plane is 18 mm to 43 mm.

4. 3. The open-type earphone according to claim 2, wherein, in an unworn state, the range of the distance between the centroid of a projection of the sound generating unit onto a specific reference plane and the projection of the first portion of the earhook onto the specific reference plane is 13 mm to 38 mm.

5. The open-type earphone according to claim 2 , wherein the distance between the centroid of the first projection and the projection of the edge of the cavity of the concha onto the sagittal plane ranges from 4 mm to 25 mm.

6. a battery compartment located at an end of the earhook away from the sound generating unit; In an unworn state, a centroid of a projection of the sound generating unit onto a specific reference plane has a third distance from a centroid of a projection of the battery housing onto the specific reference plane; In a worn state, the centroid of the first projection has a fourth distance from the centroid of the projection of the battery compartment onto the sagittal plane; The open-type earphone according to claim 2 , wherein a ratio of the difference between the fourth distance and the third distance to the fourth distance is in a range of 0.3 to 0.

8.

7. The open-type earphone according to claim 6, wherein the third distance range is from 16.7 mm to 25 mm, or the fourth distance range is from 20 mm to 30 mm.

8. The open-type earphone according to claim 2, wherein the range of the inclination angle of the projection of the upper wall or the lower wall of the sound generating unit onto the sagittal plane with respect to the horizontal direction is 13° to 21°.

9. the range of the distance between the midpoint of the projection of the upper wall of the sound generating unit onto the sagittal plane and the highest point of the second projection is 24 mm to 36 mm; The open-type earphone according to claim 8, wherein the range of the distance between the midpoint of the projection of the lower wall of the sound generating unit onto the sagittal plane and the highest point of the second projection is 36 mm to 54 mm.

10. 9. The open-type earphone according to claim 8, wherein, in a worn state, the range of the distance between the midpoint of the projection of the upper wall of the sound generating unit onto the sagittal plane and the projection of the vertex of the upper ear hook onto the sagittal plane is 21 mm to 32 mm, and the range of the distance between the midpoint of the projection of the lower wall of the sound generating unit onto the sagittal plane and the projection of the vertex of the upper ear hook onto the sagittal plane is 32 mm to 48 mm.

11. 3. The open-type earphone of claim 2, wherein the distance between an end of the first projection and a projection of the edge of the cavity of the concha onto the sagittal plane is 13 mm or less.

12. 3. The open-type earphone according to claim 2, wherein the sound generating unit has an inclination angle of 15° to 23° with respect to an ear hook plane when the earphone is not being worn.

13. 3. The open-type earphone according to claim 2, wherein the range of the included angle between a projection of the upper wall of the sound generating unit onto the sagittal plane and a tangent to a projection of the connection point of the second portion of the earhook and the upper wall onto the sagittal plane is 100° to 150°.

14. 14. The open-type earphone according to claim 13, wherein, when the earphone is not being worn, the distance between the ear hook plane and a point of the sound generating unit that is farthest from the ear hook plane is 11.2 mm to 16.8 mm.

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