Open Type Earphones

Abstract

An embodiment of the present specification provides an open-type earphone including a sound generating unit and an ear hook. The sound generating unit includes a transducer and a housing that accommodates the transducer. In a worn state, a part of the ear hook is hung between the user's auricle and head, and another part extends to the side of the auricle away from the head and is connected to the sound generating unit, and the sound generating unit is fixed to a position near the ear canal so as not to block the ear canal. A sound output hole is formed on a side of the housing facing the auricle, which outputs sound generated by the transducer from the housing and transmits it to the ear canal, and the ratio of the area of ​​the sound output hole to the area of ​​the inner side on which the sound output hole is formed is 0.015 to 0.25.

Description

[Technical field]

[0001] The present application relates to the technical field of acoustics, and in particular to open 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 an international 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) are widely applied in people's daily lives, and by using them with electronic devices such as mobile phones and computers, users can enjoy a feast of hearing. An open-type earphone is a portable audio output device that realizes acoustic conduction in a specific range. Compared with traditional canal-type earphones and headphones, an open-type earphone has the characteristic of not blocking or covering the ear canal, allowing users to obtain audio information from the external environment while listening to music, thereby improving safety and comfort. The output performance of an open-type earphone has a great impact on the user's comfort when using it.

[0004] Therefore, there is a need to provide an open earphone that improves the output performance of an open earphone. Summary of the Invention [Means for solving the problem]

[0005] The open-type earphone according to an embodiment of the present application includes an acoustic generating unit including a transducer and a housing that accommodates the transducer, and an ear hook that, when worn, has a first portion that is hung between the user's auricle and head and a second portion that extends to the side of the auricle away from the head and is connected to the acoustic generating unit, fixing the acoustic generating unit at a position near the auditory canal so as not to block the auditory canal, and a sound emission hole is formed on the inner surface of the housing facing the auricle, which guides sound generated by the transducer out of the housing and transmits it to the auditory canal, and the ratio of the area of ​​the sound emission hole to the area of ​​the inner surface on which the sound emission hole is formed is 0.015 to 0.25.

[0006] In some embodiments, in the worn state, the housing is at least partially inserted into the cavity of the concha, and the cross-sectional area of ​​the sound emission hole is 2.87 mm 2 ~46.10mm 2 The area of ​​the inner surface is 160 mm 2 ~240mm 2 It is.

[0007] In some embodiments, the ratio of the cross-sectional area of ​​the sound emitting hole to the square of the depth of the sound emitting hole is between 0.31 and 512.2.

[0008] In some embodiments, the depth of the sound emission holes ranges from 0.3 mm to 3 mm.

[0009] In some embodiments, the range of the distance from the center of the sound emission hole to the lower surface of the sound generating part is 4.05 mm to 6.05 mm.

[0010] In some embodiments, the range of the distance from the center of the sound emission hole to the rear side surface of the sound generating unit is 8.15 mm to 12.25 mm.

[0011] In some embodiments, the transducer includes a magnetic circuit assembly that provides a magnetic field, and the distance from the center of the sound emission hole to the bottom surface of the magnetic circuit assembly ranges from 5.65 mm to 8.35 mm.

[0012] In some embodiments, the range of the distance from the center of the sound emission hole to the longitudinal center plane of the magnetic circuit assembly is 1.45 mm to 2.15 mm.

[0013] In some embodiments, when the earphone is worn, the range of the distance between the center of the sound emission hole and the top apex of the ear hook is 22.5 mm to 34.5 mm.

[0014] In some embodiments, when worn, the range of the distance from the projection of the center of the sound emission hole onto the sagittal plane to the projection of the upper apex of the ear hook onto the sagittal plane is 18 mm to 30 mm.

[0015] In some embodiments, when the earphone is worn, the ratio of the distance from the center of the sound emission hole to the upper apex of the ear hook to the distance between the upper boundary and the lower boundary of the inner surface is 1.2 to 2.2.

[0016] In some embodiments, when the earphones are worn, the ratio of the distance from the center of the sound emission hole to the upper apex of the ear hook to the distance from the center of the sound emission hole to the upper side surface of the sound generating unit is 1.94 to 2.93.

[0017] In some embodiments, the range of the distance from the projection of the center of the sound emission hole onto the sagittal plane to the projection of the center of the ear canal opening of the ear canal onto the sagittal plane is 2.2 mm to 3.8 mm.

[0018] In some embodiments, the range of the distance from the projection of the center of the sound emission hole onto the sagittal plane to the projection of the midpoint of the upper boundary of the inner surface onto the sagittal plane is 10.0 mm to 15.2 mm.

[0019] In some embodiments, the range of the distance from the projection of the midpoint of the upper boundary of the medial surface onto the sagittal plane to the projection of the center of the ear canal opening onto the sagittal plane is between 12 mm and 18 mm.

[0020] In some embodiments, the range of the distance from the projection of the center of the sound emission hole onto the sagittal plane to the projection of the 1 / 3 point of the lower boundary of the inner surface onto the sagittal plane is 3.5 mm to 5.6 mm.

[0021] In some embodiments, the range of the distance from the projection of the 1 / 3 point of the lower boundary of the medial surface onto the sagittal plane to the projection of the center of the ear canal opening onto the sagittal plane is 1.7 mm to 2.7 mm.

[0022] In some embodiments, when worn, the housing is at least partially located at the antihelix, and the distance from the center of the sound emission hole to the lower surface of the sound generating portion is in the range of 2.3 mm to 3.6 mm.

[0023] In some embodiments, the range of the distance from the center of the sound emission hole to the rear side surface of the sound generating unit is 9.5 mm to 15.0 mm.

[0024] In some embodiments, when the earphone is worn, the range of the distance between the center of the sound emission hole and the top apex of the ear hook is 17.5 mm to 27.0 mm.

[0025] In some embodiments, when the earphone is worn, the ratio of the distance from the center of the sound emission hole to the upper apex of the ear hook to the distance between the upper boundary and the lower boundary of the inner surface is 0.95 to 1.55.

[0026] In some embodiments, when the earphones are worn, the ratio of the distance from the center of the sound emission hole to the upper apex of the ear hook to the distance from the center of the sound emission hole to the upper side surface of the sound generating unit is 1.19 to 2.50.

[0027] In some embodiments, the distance between the center of the sound hole and the plane on which the ear hook is located is between 3 mm and 6 mm.

[0028] In some embodiments, the ratio of the major axis dimension of the sound emitting hole to the minor axis dimension of the sound emitting hole is in the range of 1-10.

[0029] In some embodiments, the ratio of the major axis dimension of the sound emitting hole to the minor axis dimension of the sound emitting hole is in the range of 2-4.

[0030] The open-type earphone according to the embodiment of the present specification includes an acoustic generating unit including a transducer and a housing that accommodates the transducer, and an ear hook that, when worn, has a first portion that is hung between the user's auricle and head and a second portion that extends to the side of the auricle away from the head and is connected to the acoustic generating unit, and fixes the acoustic generating unit at a position near the auditory canal so as not to block the auditory canal, the transducer includes a diaphragm, and a sound emission hole is formed on the inner surface of the housing facing the auricle, which guides sound generated by vibration of the diaphragm out of the housing and transmits it to the auditory canal, and the ratio of the area of ​​the sound emission hole to the projected area of ​​the diaphragm in the vibration direction is 0.016 to 0.261.

[0031] In some embodiments, in the worn state, the housing is at least partially inserted into the cavity of the concha, and the cross-sectional area of ​​the sound emission hole is 2.87 mm 2 ~46.10mm 2 The projected area of ​​the diaphragm in the direction of vibration is 150 mm 2 ~230mm 2 It is.

[0032] The open-type earphone according to the embodiment of the present specification includes an acoustic generating unit including a transducer and a housing that accommodates the transducer, and an ear hook that, when worn, has a first part that is hung between the user's auricle and head and a second part that extends to the side of the auricle away from the head and is connected to the acoustic generating unit, fixing the acoustic generating unit at a position near the ear canal so as not to block the ear canal, the transducer includes a diaphragm, and a sound emission hole is formed on the inner surface of the housing facing the auricle, which guides sound generated by vibration of the diaphragm out of the housing and transmits it to the ear canal, and the distance between the center of the sound emission hole and the upper apex of the ear hook is in the range of 22.5 mm to 34.5 mm.

[0033] 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 reference numerals indicate like structures. [Brief description of the drawings]

[0034] [Figure 1] 1 is a schematic diagram of an exemplary ear according to some embodiments of the present application. [Diagram 2] FIG. 1 is an exemplary diagram of an open-type earphone in accordance with some embodiments of the present specification. [Diagram 3] FIG. 2 is a schematic diagram of two point sound sources and a listening position according to some embodiments of the present application. [Figure 4] FIG. 10 is a comparison diagram of sound leakage index at different frequencies for a single point sound source and dual point sound sources, in accordance with some embodiments of the present application. [Diagram 5] FIG. 2 is an exemplary distribution diagram of a dipole sound source in which a baffle is placed between two sources, according to some embodiments of the present application; [Figure 6] FIG. 13 illustrates a sound leakage index when a baffle is installed between two dipole sound sources and when no baffle is installed, according to some embodiments of the present application. [Figure 7] 1 is an exemplary schematic diagram of an open-type earphone according to some embodiments of the present application; FIG. [Figure 8] FIG. 8 is a schematic diagram of the open-type earphone shown in FIG. 7, showing the side facing the ear. [Figure 9] FIG. 2 is an exemplary schematic distribution diagram of a cavity structure placed around one of the dipole sound sources according to some embodiments of the present application. [Figure 10A] 1 is a schematic diagram of a dipole source structure and a listening principle when a cavity structure is built around one of the dipole sources according to some embodiments of the present application; FIG. [Figure 10B] FIG. 1 is a schematic diagram of a dipole sound source structure and a sound leakage principle when a cavity structure is constructed around one of the dipole sound sources according to some embodiments of the present application; [Figure 11A] 1 is a schematic diagram of a cavity structure with two horizontal openings according to some embodiments of the present application. FIG. [Figure 11B] FIG. 2 is a schematic diagram of a cavity structure with two vertical openings according to some embodiments of the present application. [Figure 12]FIG. 10 is a comparison diagram of the listening index curves of a two-opening cavity structure and a one-opening cavity structure according to some embodiments of the present application. [Figure 13] 1 is an exemplary schematic diagram of an open-type earphone according to some other embodiments of the present application; FIG. [Figure 14] FIG. 14 is a schematic diagram of the open-type earphone shown in FIG. 13 from the ear side. [Figure 15] FIG. 1 is a schematic diagram of an open-type earphone according to some embodiments of the present disclosure projected onto a sagittal plane in a worn state. [Figure 16A] FIG. 2 is an exemplary internal block diagram of a sound generating unit according to some embodiments of the present disclosure. [Figure 16B] FIG. 2 is an example internal block diagram of a transducer in accordance with some embodiments of the present disclosure. [Figure 17A] FIG. 13 is a frequency response curve diagram of an open-type earphone corresponding to different cross-sectional areas of sound emission holes when the aspect ratio is constant, according to some embodiments of the present disclosure. [Figure 17B] 4A-4C are frequency response curve diagrams of front cavities corresponding to sound outlets with different cross-sectional areas according to some embodiments herein. [Figure 18A] 1A-1C are frequency response curve diagrams of open-type earphones corresponding to sound output holes with different aspect ratios in accordance with some embodiments of the present disclosure. [Figure 18B] 4A-4C are frequency response curve diagrams of front cavities corresponding to different sound outlet depths according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] In order to more clearly describe the technical means of the embodiments of the present application, the drawings necessary for the description of the embodiments are briefly described below. Obviously, the drawings described below are only some examples or 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 creative efforts. Unless otherwise clear from the context or described otherwise, the same numbers in the drawings indicate the same structures or operations.

[0036] It should be understood that the terms "system," "apparatus," "unit," and / or "module" used herein are ways of distinguishing between different levels of assemblies, elements, components, parts, or structures, however, other terms may be used in place of the above terms if they can achieve the same purpose.

[0037] As used in this application and the claims, unless the context clearly dictates otherwise, terms such as "a," "one," "one kind," and / or "the" do not specifically refer to the singular but may include the plural. In general, the terms "comprise" and "containing" are merely intended to indicate the inclusion of explicitly identified steps and elements, and these steps and elements are not intended to be an exclusive listing, and a method or apparatus may include other steps or elements.

[0038] It should be noted that in the description of this specification, the terms "first", "second", "third", "fourth", etc. are for explanatory purposes only and should not be understood as indicating or suggesting the relative importance or the quantity of the technical features shown. Thus, a feature defined by "first", "second", "third", "fourth" may explicitly or implicitly indicate that it includes at least one of the feature. In the description of this specification, unless otherwise clearly and specifically limited, "plurality" means at least two, e.g., two, three, etc.

[0039] In this specification, unless otherwise clearly specified and limited, the terms "connected", "fixed", etc. should be understood in a broad sense. For example, unless otherwise clearly limited, the term "connected" may be a fixed connection, a removable connection, or an integral connection, may be a mechanical connection or an electrical connection, may be a direct connection, may be an indirect connection via an intermediate medium, may be an internal communication between two elements, or may be an interactive relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific situation.

[0040] FIG. 1 is a schematic diagram of an exemplary ear according to some embodiments of the present application. As shown in FIG. 1, the ear 100 (also called the pinna) may include an ear canal 101, a concha cavity 102, a concha navicular 103, a triangular fossa 104, an antihelix 105, a scapha 106, a helix 107, an earlobe 108, a tragus 109, and a helical crus 1071. In some embodiments, the stability of the fitting of the audio device can be achieved by supporting the audio device by one or more parts of the ear 100. In some embodiments, parts such as the ear canal 101, the concha cavity 102, the concha navicular 103, and the triangular fossa 104 have a certain depth and volume in three-dimensional space, and can realize the fitting needs of the audio device. For example, an audio device (e.g., a canal-type earphone) may be fitted in the ear canal 101. In some embodiments, the fitting of the audio device (e.g., an open-type earphone) can be realized by a part of the ear 100 other than the ear canal 101. For example, the acoustic device can be fitted by the concha 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, and the helix 107, or a combination thereof. In some embodiments, the user's earlobe 108 can be further utilized to improve the comfort and reliability of the acoustic device. The acoustic device can be fitted and the sound can be transmitted by other parts of the ear unit 100 other than the ear canal 101, and the user's ear canal 101 can be "opened up". When the user is wearing an acoustic device (e.g., an open-type earphone), the acoustic device does not block the user's ear canal 101 (or the ear canal or ear canal opening), and the user can hear the sound from the acoustic device as well as the sound from the environment (e.g., the sound of a horn, the sound of a bicycle bell, the voices of people around, the sound of traffic control, etc.), thereby reducing the probability of a traffic accident. In some embodiments, depending on the structure of the ear portion 100, the acoustic device can be designed to have a structure that fits the ear portion 100, thereby enabling the sound generating portion of the acoustic device to be worn at different positions on the ear portion.For example, when the acoustic device is an open-type earphone, the open-type earphone may include a suspension structure (e.g., an ear hook) and a sound-generating unit, the sound-generating unit and the suspension structure are physically connected, and the suspension structure may conform to the shape of the pinna so as to place the entire or partial structure of the sound-generating unit in front of the tragus 109 (e.g., the area J surrounded by the dashed line in FIG. 1). Also, for example, when a user wears an open-type earphone, the entire or partial structure of the sound-generating unit may contact the upper part of the ear canal 101 (e.g., a position where one or more parts such as the concha navicular 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, the helix 107, and the crus helix 1071 are located). Furthermore, for example, when a user is wearing an open-type earphone, 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 unit 100 (e.g., the concha cavity 102, the concha scapha 103, and the triangular fossa 104, etc.) (e.g., area M1 including at least the concha cavity 103 and the triangular fossa 104, and area M2 including at least the concha cavity 102, both surrounded by dashed lines in Figure 1).

[0041] Since there may be individual differences among different users, there are dimensional differences such as different shapes and sizes of the ears. For ease of explanation and understanding, unless otherwise specified, the present specification will further describe the mounting method of the acoustic device to the ear model in different embodiments, mainly based on an ear model having a "standard" shape and size. For example, a simulator including a head and its (left and right) ears manufactured based on ANSI: S3.36, S3.25 and IEC: 60318-7 standards, such as GRAS 45BC KEMAR, can be used as a reference for mounting the acoustic device, which can provide a scenario in which most users normally mount the acoustic device. By way of example only, the reference ear may be characterized in that the projection of the pinna onto the sagittal plane in the vertical axis direction is within the range of 49.5 mm to 74.3 mm, and the projection of the pinna onto the sagittal plane in the sagittal axis direction is within the range of 36.6 mm to 55 mm. Therefore, the descriptions "worn by a user", "in a worn state" and "in a worn state" in this application may refer to the acoustic device described in this application being worn on the ear of the simulator. Naturally, considering the existence of individual differences among different users, the structure, shape, size, thickness, etc. of one or more parts of the ear part 100 may have certain differences, and in order to meet the needs of different users, a differentiated design can be made for the acoustic device, and these differentiated designs can be expressed to be adapted to different ear parts by having characteristic parameters of one or more parts of the acoustic device (e.g., the sound generating part, ear hook, etc. described below) have different ranges of values.

[0042] In addition, in the fields of medicine, anatomy, and the like, 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 is a cutting plane perpendicular to the ground along the front-back direction of the body, dividing the human body into two parts, the left and right, the coronal plane is a cutting plane perpendicular to the ground along the left-right direction of the body, dividing the human body into two parts, the front and the back, and the horizontal plane is a cutting plane parallel to the ground along the up-down direction perpendicular to the body, dividing the human body into two parts, the top and the bottom. Accordingly, the sagittal axis is an axis perpendicular to the coronal plane along the front-back direction of the body, the coronal axis is an axis perpendicular to the sagittal plane along the left-right direction of the body, and the vertical axis is an axis perpendicular to the horizontal plane along the up-down direction of the body. Furthermore, the "front side of the ear" described in this application is a concept opposite to the "rear side of the ear", the former being the side of the ear away from the head and the latter being the side of the ear facing the head. When the ear of the simulator is viewed from the direction in which the coronal axis of the human body is located, a schematic diagram of the front profile of the ear is obtained as shown in FIG.

[0043] FIG. 2 is an exemplary diagram of an open-type earphone according to some embodiments of the present disclosure.

[0044] In some embodiments, the open earphone 10 may include, but is not limited to, air conduction earphones, bone conduction earphones, etc. In some embodiments, the open earphone 10 may be combined with products such as glasses, headphones, head mounted displays, AR / VR helmets, etc.

[0045] As shown in FIG. 2, the open-type earphone 10 may include a sound generating unit 11 and an ear hook 12.

[0046] The sound generating unit 11 may be used to be worn on the user's body, and the sound generating unit 11 can generate sound and input it to the user's ear canal. In some embodiments, the sound generating unit 11 may include a transducer (e.g., the transducer 116 shown in FIG. 16A ) and a housing 111 that accommodates the transducer. The housing 111 may be connected to the ear hook 12. The transducer is used to convert an electrical signal into a corresponding mechanical vibration to generate sound. In some embodiments, a sound emission hole 112 is formed on the side of the housing facing the auricle, and the sound emission hole 112 is used to guide the sound generated by the transducer out of the housing 111 and then transmit it to the ear canal so that the user can hear the sound. In some embodiments, the transducer (e.g., diaphragm) may partition the housing 111 to form a front cavity (e.g., the front cavity 114 shown in FIG. 16A) and a rear cavity of the earphone, and the sound output hole 112 communicates with the front cavity and can guide the sound generated in the front cavity out of the housing 111 and transmit it to the ear canal. In some embodiments, the sound guided through the sound output hole 112 can be partially propagated to the ear canal to be heard by the user, and the other part of the sound guided through the sound output hole 112 propagates to the outside of the open-type earphone 10 and the ear unit through a gap between the sound generating unit 11 and the ear unit (e.g., a part of the concha cavity that is not covered by the sound generating unit 11), together with the sound reflected in the ear canal, thereby forming a first sound leakage in the far field. At the same time, one or more decompression holes 113 are generally formed on the other side of the housing 111 (e.g., a side away from or away from the user's ear canal). The decompression hole 113 is farther from the ear canal than the sound emission hole 112, and sound propagating from the decompression hole 113 generally forms a second sound leakage in the far field. Since the intensity of the first sound leakage and the intensity of the second sound leakage are equal and the phases of the first sound leakage and the second sound leakage are (substantially) opposite to each other, the two can be offset in opposite phase in the far field, which helps to reduce sound leakage in the far field of the open-type earphone 10.For a more detailed description of the sound generating unit 11, please refer to other parts of this specification, such as Figures 7, 13, 16A, etc. and their descriptions.

[0047] The ear hook 12 may have one end connected to the sound generating unit 11 and the other end extending along the boundary between the user's ear and head. In some embodiments, the ear hook 12 may have an arc-shaped structure that fits the user's auricle so as to be suspended from the user's auricle. For example, the ear hook 12 may have an arc-shaped structure that fits the boundary between the user's head and ear so as to be hung between the user's auricle and head. In some embodiments, the ear hook 12 may have a clamping structure that fits the user's auricle so as to be clamped to the user's auricle. Exemplarily, the ear hook 12 may include a hook-shaped portion (first portion 121 shown in FIG. 7) and a connecting portion (second portion 122 shown in FIG. 7) that are connected in order. The connecting portion connects the hook-shaped portion and the sound generating unit 11 so that the open-type earphone 10 is curved in three-dimensional space when it is in a non-worn state (i.e., natural state). In other words, in three-dimensional space, the hook-shaped portion, the connecting portion, and the sound generating unit 11 are not on the same plane. When the open-type earphone 10 is installed in this manner, the hook-shaped portion is mainly hung between the rear side of the user's ear and the head, and the sound generating unit 11 mainly contacts the front side of the user's ear, so that the sound generating unit 11 and the hook-shaped portion can cooperate to hold the ear. For example, the connection portion may extend from the head to the outside of the head, and further cooperate with the hook-shaped portion to provide the sound generating unit 11 with a pressing force toward the front side of the ear. The sound generating unit 11 can be pressed against the area where the concha cavity 102, the concha navicular 103, the triangular fossa 104, the antihelix 105, etc. are located by the action of the pressing force, so that the ear canal 101 of the ear is not blocked when the open-type earphone 10 is installed.

[0048] In some embodiments, in order to improve the stability of the open-type earphone 10 in the worn state, the open-type earphone 10 can use any one of the following methods or a combination thereof. First, at least a part of the ear hook 12 is installed as a conforming structure that fits at least one of the rear side of the ear part 100 and the head, and the contact area between the ear hook 12 and the ear part 100 and / or the head is increased, thereby increasing the resistance of the open-type earphone 10 to falling off from the ear part 100. Second, at least a part of the ear hook 12 is installed as an elastic structure to have a certain amount of deformation in the worn state, and the positive pressure of the ear hook 12 on the ear part and / or the head is increased, thereby increasing the resistance of the open-type earphone 10 to falling off from the ear part. Third, at least a part of the ear hook 12 is installed so as to generate a reaction force that abuts against the head and presses the ear part in the worn state, and presses the sound generating unit 11 to the front side of the ear part, thereby increasing the resistance of the open-type earphone 10 to falling off from the ear part. Fourth, the sound generating unit 11 and the ear hook 12 are arranged to clamp the area where the antihelix is ​​located, the area where the concha cavity is located, etc. from both the front and back of the ear part when worn, thereby increasing the resistance of the open-type earphone 10 to falling off from the ear part. Fifth, the sound generating unit 11 or the auxiliary structure connected thereto is arranged to be inserted at least partially into a cavity such as the concha cavity, the concha navicularis, the triangular fossa, and the navicular fossa, thereby increasing the resistance of the open-type earphone 10 to falling off from the ear part.

[0049] In some embodiments, the ear hook 12 may include, but is not limited to, an ear hook, an elastic band, etc., so as to better secure the open earphone 10 to the user's body and prevent it from falling off during use by the user. In some embodiments, the open earphone 10 may not include the ear hook 12, and the sound generating unit 11 may be fixed near the user's ear 100 in a hanging or clamping manner.

[0050] In some embodiments, the sound generating unit 11 may have a regular or irregular shape, such as a circular ring, an ellipse, a racetrack, a polygon, a U-shape, a V-shape, a semicircle, etc., so that the sound generating unit 11 can be directly hung on the ear unit 100 of a user. In some embodiments, the sound generating unit 11 may have a long axis direction X and a short axis direction Y that are perpendicular to the thickness direction Z and perpendicular to each other. The long axis direction X may be defined as the direction in which the extension dimension is the largest in the shape of a two-dimensional projection plane of the sound generating unit 11 (e.g., a projection onto a plane on which the outer surface of the sound generating unit 11 is located, or a projection onto a sagittal plane) (e.g., when the projection shape is a rectangle or an approximately rectangular shape, the long axis direction is the length direction of the rectangle or approximately rectangular shape). The short axis direction Y may be defined as the direction perpendicular to the long axis direction X in the shape of the projection of the sound generating unit 11 onto the sagittal plane (e.g., when the projection shape is a rectangle or an approximately rectangular shape, the short axis direction is the width direction of the rectangle or approximately rectangular shape). The thickness direction Z may be defined as a direction perpendicular to the two-dimensional projection plane, for example coinciding with the direction of the coronal axis, both of which point in the left-right direction of the body.

[0051] In some embodiments, when the user wears the open-type earphone 10, the sound generating unit 11 may be fixed at a position near the user's ear canal 101 so as not to block the ear canal. In some embodiments, the projection of the open-type earphone 10 onto the sagittal plane may not cover the ear canal of the user when worn. For example, the projection of the sound generating unit 11 onto the sagittal plane may be at a position on both the left and right sides of the head, located in front of the tragus on the sagittal axis of the human body (for example, the position indicated by the solid line frame A in FIG. 2). In this case, the sound generating unit 11 may be located in front of the user's tragus, the long axis of the sound generating unit 11 may be in a vertical or approximately vertical state, the projection of the short axis direction Y onto the sagittal plane coincides with the direction of the sagittal axis, the projection of the long axis direction X onto the sagittal plane coincides with the direction of the vertical axis, and the thickness direction Z is perpendicular to the sagittal plane. Also, for example, the projection of the sound generating unit 11 onto the sagittal plane may be located at the antihelix 105 (for example, the position indicated by the dashed line frame C in FIG. 2). In this case, the sound generating unit 11 is at least partially located in the antihelix 105, the long axis of the sound generating unit 11 is horizontal or approximately horizontal, the long axis direction X of the sound generating unit 11 projected onto the sagittal plane coincides with the direction of the sagittal axis, the short axis direction Y projected onto the sagittal plane coincides with the vertical axis direction, and the thickness direction Z is perpendicular to the sagittal plane. This prevents the sound generating unit 11 from blocking the ear canal, freeing both ears of the user, increasing the contact area between the sound generating unit 11 and the ear unit 100, and improving the wearing comfort of the open-type earphone 10.

[0052] In some embodiments, in the worn state, the projection of the open-type earphone 10 onto the sagittal plane may cover or at least partially cover the user's ear canal, for example, the projection of the sound-generating unit 11 onto the sagittal plane may be located within the cavity of the concha 102 (for example, the position shown in the dashed frame B in FIG. 2) and may contact the crus helix 1071 and / or the helix 107. In this case, the sound-generating unit 11 is at least partially located within the cavity of the concha 102, the sound-generating unit 11 is in an inclined state, the projection of the short axis direction Y of the sound-generating unit 11 onto the sagittal plane may have a certain included angle with the direction of the sagittal axis, i.e., the short axis direction Y is also installed with a corresponding inclination, the projection of the long axis direction X onto the sagittal plane may have a certain included angle with the direction of the sagittal axis, i.e., the long axis direction X is also installed with a inclination, and the thickness direction Z is perpendicular to the sagittal plane. In this case, since the cavity of the concha 102 has a certain volume and depth, there is a certain distance between the inner surface IS of the open-type earphone 10 and the cavity of the concha, and the ear canal communicates with the outside through the gap between the inner surface IS and the cavity of the concha, so that both ears of the user can be released. In addition, the sound generating unit 11 and the cavity of the concha can cooperate to form an auxiliary cavity (for example, a cavity structure described later) that communicates with the ear canal. In some embodiments, the sound emission hole 112 may be at least partially located in the auxiliary cavity, and the sound derived from the sound emission hole 112 is restricted by the auxiliary cavity, that is, the auxiliary cavity can converge the sound and propagate more of the sound into the ear canal, thereby improving the volume and quality of the sound heard by the user in the near field and improving the acoustic effect of the open-type earphone 10.

[0053] The above description of the open-type earphone 10 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, the open-type earphone 10 may include a battery assembly, a Bluetooth® assembly, etc., or a combination thereof. The battery assembly is used to power the open-type earphone 10. The Bluetooth® assembly can wirelessly connect the open-type earphone 10 to other devices (e.g., mobile phones, computers, etc.). These changes and modifications are still within the scope of protection of the present application.

[0054] In some embodiments, as shown in FIG. 3, sound can be transmitted to the outside of the open-type earphone 10 through the sound emission hole 112, which can be regarded as a monopole sound source (or point sound source) A1, and a first sound can be generated, and sound can be transmitted to the outside of the open-type earphone 10 through the decompression hole 113, which can be regarded as a monopole sound source (or point sound source) A2, and a second sound can be generated. The second sound and the first sound may be in opposite or nearly opposite phases, and can be cancelled in opposite phases in the far field, i.e., form an "acoustic dipole" to reduce sound leakage. In some embodiments, the connection line of the two monopole sound sources may be directed to the ear canal (denoted as "listening position") so that the user can hear a sufficiently loud sound in the wearing state. The magnitude of the sound pressure (denoted as Pear) at the listening position can represent the strength or weakness of the sound heard by the user (i.e., the listening sound pressure in the near field). Furthermore, the magnitude of sound pressure (denoted as Pfar) on a sphere centered on the user's listening position (or on a sphere with a radius of r and a circle centered at the center of the dipole sound source (A1 and A2 shown in FIG. 3)) can be statistically calculated, and the strength of sound leakage into the far field of the open-type earphone 10 (i.e., the sound pressure of sound leakage into the far field) can be expressed. Pfar can be obtained using various statistical methods, for example, by finding the average value of sound pressure at each point on the sphere, and further, for example, by finding the sound pressure distribution at each point on the sphere and performing a surface integral, etc.

[0055] It should be noted that the measurement method of sound leakage in this specification is merely an illustrative explanation of the principle and effect, and is not limited thereto, and the measurement method and calculation method of sound leakage may be reasonably adjusted according to the actual situation. For example, the center of the dipole sound source is set as the center of a circle, and the sound pressure amplitudes of two or more points are evenly selected and averaged based on a certain spatial angle in the far field. In some embodiments, the measurement method of listening may be to select one position point near the point sound source as the listening position, and the sound pressure amplitude measured at the listening position is set as the listening value. In some embodiments, the listening position may be on the connecting line of the two point sound sources, or may not be on the connecting line of the two point sound sources. The measurement method and calculation method of listening may be reasonably adjusted according to the actual situation, for example, to average the sound pressure amplitudes of other points or one or more points in the near field position. Also, for example, a certain point sound source is set as the center of a circle, and the sound pressure amplitudes of two or more points are evenly selected and averaged based on a certain spatial angle in the near field. In some embodiments, the distance between the near-field listening position and the point sound source is much smaller than the distance between the point sound source and the far-field sound leakage measurement sphere.

[0056] Obviously, the sound pressure Pear transmitted from the open-type earphone 10 to the user's ear should be large enough to improve the listening effect. The sound pressure Pfar in the far field should be small enough to improve the sound leakage reduction effect. Therefore, the sound leakage index α can be used as an index to evaluate the sound leakage reduction ability of the open-type earphone 10.

[0057]

number

[0058] As can be seen from equation (1), the smaller the sound leakage index, the higher the sound leakage reduction capability of the open-type earphones, and the smaller the far-field sound leakage will be when the near-field listening volume at the listening position is the same.

[0059] FIG. 4 is a comparison diagram of sound leakage index at different frequencies of a single point sound source and a dual point sound source according to some embodiments of the present specification. The dual point sound source (also called dipole sound source) in FIG. 4 may be a typical dual point sound source, that is, the interval is constant, the amplitude of the two point sound sources is the same, and the phase of the two point sound sources is opposite. It should be noted that the selection of a typical dual point sound source is only for illustrating the principle and effect, and the parameters of each point sound source can be adjusted according to actual needs to have a certain difference from the typical dual point sound source. As shown in FIG. 4, when the interval is constant, the sound leakage generated by the dual point sound source increases with the increase of frequency, and the sound leakage reduction ability becomes weaker with the increase of frequency. When the frequency is greater than a certain frequency value (for example, about 8000Hz as shown in FIG. 4), the generated sound leakage is greater than that of a single point sound source, and this frequency (for example, 8000Hz) is the upper limit frequency at which the dual point sound source can reduce sound leakage.

[0060] In some embodiments, a baffle may be installed between the sound outlet 112 and the decompression 113 to improve the acoustic output effect of the open-type earphone, i.e., to increase the sound intensity at the near-field listening position and reduce the volume of far-field sound leakage.

[0061] 5 is an exemplary distribution diagram of a dipole sound source according to some embodiments of the present disclosure, in which a baffle is installed between two sound sources. As shown in FIG. 5, when a baffle is installed between a point sound source A1 and a point sound source A2, in the near field, the sound wave of the point sound source A2 can only interfere with the sound wave of the point sound source A1 at the listening position by bypassing the baffle, which corresponds to an increase in the acoustic distance from the point sound source A2 to the listening position. Therefore, assuming that the point sound source A1 and the point sound source A2 have the same amplitude, the amplitude difference between the sound waves of the point sound source A1 and the point sound source A2 at the listening position increases compared to when the baffle is not installed, thereby decreasing the degree to which the sounds of the two paths are offset at the listening position, and increasing the volume at the listening position. In the far field, the sound waves generated by the point sound source A1 and the point sound source A2 can interfere with each other in a wide spatial range without going around the baffle (similar to the case where there is no baffle), so the far field sound leakage does not increase significantly compared to the case where there is no baffle. Therefore, by installing a baffle structure around one of the point sound sources A1 and A2, the sound volume at the near field listening position can be significantly increased without a significant increase in the far field sound leakage volume.

[0062] FIG. 6 is a diagram showing the sound leakage index when a baffle is installed between two sound sources of a dipole sound source and when a baffle is not installed between two sound sources of a dipole sound source according to some embodiments of the present specification. After adding a baffle to the double point sound source, in the near field, it corresponds to increasing the distance between the two point sound sources, the sound volume at the near field listening position corresponds to that generated by the double point sound source with a large distance, the listening sound volume in the near field is obviously increased compared to the case without a baffle, and in the far field, the sound field of the two point sound sources is less affected by the baffle, and the generated sound leakage corresponds to that generated by the double point sound source with a small distance. Therefore, as shown in FIG. 6, after adding the baffle, the sound leakage index is significantly smaller than that without the baffle, that is, at the same listening volume, the sound leakage in the far field is smaller than that without the baffle, and the sound leakage reduction ability is obviously stronger.

[0063] Fig. 7 is an exemplary wearing schematic diagram of an open-type earphone according to some embodiments of the present disclosure. Fig. 8 is a schematic configuration diagram of the side facing the ear of the open-type earphone shown in Fig. 7.

[0064] As shown in Fig. 7, the ear hook 12 has an arc-shaped structure that fits the boundary between the user's head and the ear unit 100. The sound generating unit 11 (or the housing 111 of the sound generating unit 11) may have a connection end CE connected to the ear hook 12 and a free end FE that is not connected to the ear hook 12. When the open-type earphone 10 is in a worn state, the first part 121 of the ear hook 12 (e.g., the hook-shaped part of the ear hook 12) is hooked between the user's auricle (e.g., the helix 107) and the head, and the second part 122 of the ear hook 12 (e.g., the connection part of the ear hook) extends to the side of the auricle away from the head and is connected to the connection end CE of the sound generating unit 11, fixing the sound generating unit 11 at a position near the ear canal so as not to block the ear canal.

[0065] As shown in Fig. 7 and Fig. 8, the sound generating unit 11 may have an inner side surface IS (also referred to as the inner side surface of the housing 111) facing the ear portion along the thickness direction Z in the worn state, an outer side surface OS (also referred to as the outer side surface of the housing 111) facing away from the ear portion, and a connection surface connecting the inner side surface IS and the outer side surface OS. In addition, when viewed from the direction in which the coronal axis is located (i.e., the thickness direction Z) in the worn state, the sound generating unit 11 may be installed in a shape such as a circle, an ellipse, a rounded square, or a rounded rectangle. When the sound generating unit 11 is installed in a shape such as a circle or an ellipse, the above connection surface may be an arc-shaped side surface of the sound generating unit 11, and when the sound generating unit 11 is installed in a shape such as a rounded square or a rounded rectangle, the above connection surface may include a lower side surface LS (also referred to as the lower side surface of the housing 111), an upper side surface US (also referred to as the upper side surface of the housing 111), and a rear side surface RS (also referred to as the rear side surface of the housing 111) described later. The upper side surface US and the lower side surface LS may be the side surface where the sound generating unit 11 is away from the ear canal 101 along the short axis direction Y and the side surface where the sound generating unit 11 is close to the ear canal 101 in the worn state, respectively, and the rear side surface RS may be the side surface where the sound generating unit 11 is toward the back of the head along the length direction X in the worn state. For convenience of explanation, in this embodiment, an example is given in which the sound generating unit 11 is set to a rounded rectangle. The length of the sound generating unit 11 in the long axis direction X may be greater than the width of the sound generating unit 11 in the short axis direction Y. In some embodiments, the rear side surface RS of the earphone may be a circular arc surface to improve the aesthetics and wearing comfort of the earphone.

[0066] A transducer capable of converting an electric signal into a corresponding mechanical vibration to generate sound may be installed in the sound generating unit 11. The transducer (e.g., a diaphragm) may partition the housing 111 to form a front cavity and a rear cavity of the earphone. The sounds generated in the front cavity and the rear cavity are in opposite phase. The inner surface IS is formed with a sound output hole 112 communicating with the front cavity, and the sound generated in the front cavity is guided out of the housing 111 and transmitted to the ear canal so that the user can hear the sound. One or more decompression holes 113 communicating with the rear cavity may be formed on other sides (e.g., the outer surface OS, the upper surface US, or the lower surface LS, etc.) of the housing 111, whereby the sound generated in the rear cavity is guided out of the housing 111 and then interferes with and cancels out the sound guided out of the sound output hole 112 in the far field. In some embodiments, the decompression hole 113 is farther away from the ear canal than the sound output hole 112, reducing anti-phase cancellation at the listening position between the sound output through the decompression hole 113 and the sound output through the sound output hole 112.

[0067] In some embodiments, as shown in Fig. 7, when the open-type earphone 10 is in a worn state, the long axis direction X of the sound-generating unit 11 may be set horizontally or approximately horizontally (similar to position C shown in Fig. 2), in which case the sound-generating unit 11 is at least partially located in the antihelix 105, and the free end FE of the sound-generating unit 11 may be directed toward the back of the head. The sound-generating unit 11 may be in a horizontal or approximately horizontal state, and the projection of the long axis direction X of the sound-generating unit 11 onto the sagittal plane may coincide with the direction of the sagittal axis, the projection of the short axis direction Y onto the sagittal plane may coincide with the direction of the vertical axis, and the thickness direction Z may be perpendicular to the sagittal plane.

[0068] In some embodiments, to improve the fit between the open-type earphone 10 and the ear portion 100 and to improve the stability of the open-type earphone 10 when worn, the inner surface IS of the housing 111 may be pressed against a surface of the ear portion 100 (e.g., the antihelix 105) to increase the resistance of the open-type earphone 10 to falling out of the ear portion 100.

[0069] In some embodiments, as shown in Fig. 7 and Fig. 8, when the open-type earphone 10 is pressed against the ear part 100, the projection of the sound emission hole 112 on the sagittal plane may overlap with the projection of a structure (e.g., the concha naval 103) that is partially or entirely recessed inwardly of the ear part so that the sound emission hole 112 on the inner surface IS is not blocked by the tissue of the ear part. In some embodiments, since the concha naval 103 communicates with the concha cavity 102 and the ear canal is located within the concha cavity 102, when at least a portion of the projection of the sound emission hole 112 on the sagittal plane is located within the concha naval 103, the sound output from the sound emission hole 112 can reach the ear canal without hindrance, and the sound volume received by the ear canal is high. In some embodiments, the major axis dimension of the sound generating unit 11 should not be too long. If it is too long, the projection of the free end FE on the sagittal plane exceeds the projection of the ear part on the sagittal plane, which affects the fitting effect between the sound generating unit 11 and the ear part. Therefore, the long axis dimension of the sound generating unit 11 can be designed so that the projection of the free end FE on the sagittal plane does not exceed the projection of the helix 107 on the sagittal plane. In some embodiments, when the projection of the free end FE on the sagittal plane does not exceed the projection of the helix 107 on the sagittal plane, at least a part of the projection of the sound emitting hole 112 on the sagittal plane is located within the concha 103, that is, the sound emitting hole 112 at least partially faces the concha 103 when actually worn, so that the range of the distance d1 along the X direction from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 is 9.5 mm to 15.0 mm. In some embodiments, the range of the distance d1 along the X direction from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 is 10.5 mm to 14.0 mm. In some embodiments, the range of the distance d1 from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 along the X direction is 11.0 mm to 13.5 mm. In some embodiments, the range of the distance d1 from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 along the X direction is 11.5 mm to 13.0 mm. In some embodiments, the range of the distance d1 from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 along the X direction is 12.0 mm to 12.5 mm.

[0070] In addition, the sound output hole 112 and the decompression hole 113 are installed in the housing 111, and since each side wall of the housing 111 has a constant thickness, the sound output hole 112 and the decompression hole 113 are holes with a constant depth. In this case, the sound output hole 112 and the decompression hole 113 may have an inner opening and an outer opening. For convenience of explanation, in this specification, the center O of the sound output hole 112 above and below may be the centroid of the outer opening of the sound output hole 112. In some embodiments, in order to improve the aesthetics and wearing comfort of the earphone, the rear side surface RS of the earphone may be an arc surface. When the rear side surface RS is an arc surface, the distance from a certain position (for example, the center O of the sound output hole 112) to the rear side surface RS may be the distance from the position to a tangent plane that is farthest from the center of the sound generating unit of the rear side surface RS and is parallel to the short axis of the sound generating unit.

[0071] In this specification, the sound emission hole 112 and the decompression hole 113 communicating with the front cavity and the rear cavity, respectively, can be regarded as the point sound source A1 and the point sound source A2 shown in Fig. 5, respectively, and the ear canal can be regarded as the listening position shown in Fig. 5. At least a part of the housing of the sound generating unit 11 and / or at least a part of the pinna can be regarded as a baffle shown in Fig. 5, which increases the difference in acoustic distance to the ear canal between the sound emission hole 112 and the decompression hole 113, increases the sound intensity in the ear canal, and maintains the sound leakage reduction effect in the far field. When the open-type earphone 10 uses the structure shown in Fig. 7, that is, when at least a part of the housing 111 is located in the antihelix 105, in terms of listening effect, the sound wave of the sound output hole 112 can directly reach the ear canal, in this case, the sound output hole 112 may be located in the inner side IS close to the lower side LS, and the decompression hole 113 may be located away from the sound output hole 112, for example, the decompression hole 113 may be located away from the sound output hole 112 on the outer side OS or the upper side US. The sound wave of the decompression hole 113 must bypass the outside of the sound generating unit 11 so as to interfere with the sound wave of the sound output hole 112 in the ear canal, and the structure of the pinna that is convex upward and concave downward (for example, the antihelix in its propagation path) also increases the acoustic distance that the sound of the decompression hole 113 is conducted to the ear canal. Therefore, the sound generating unit 11 itself and / or the pinna corresponds to a baffle between the sound output hole 112 and the decompression hole 113, and the baffle increases the acoustic distance from the decompression hole 113 to the ear canal, reduces the intensity of the sound wave of the decompression hole 113 in the ear canal, thereby reducing the degree of cancellation in the ear canal of the two paths of sounds emitted by the sound output hole 112 and the decompression hole 113. As for the sound leakage effect, the sound waves generated by the sound output hole 112 and the decompression hole 113 can interfere with each other within a wide spatial range without bypassing the sound generating unit 11 itself (similar to the case where there is no baffle), so that the sound leakage does not increase obviously. Therefore, by setting the appropriate positions of the sound output hole 112 and the decompression hole 113, the sound volume in the ear canal can be significantly increased in the case where the sound leakage volume does not increase significantly.

[0072] In some embodiments, as shown in FIG. 8, in order to increase the intensity of the sound in the ear canal (i.e., the listening position) of the sound emitting hole 112, the sound emitting hole 112 may be located closer to the ear canal, i.e., the sound emitting hole 112 may be closer to the lower side surface LS of the sound generating unit 11 in the Y direction. In some embodiments, the range of the distance h1 from the center O of the sound emitting hole 112 to the lower side surface LS of the sound generating unit 11 along the Y direction is 2.3 mm to 3.6 mm. In some embodiments, the range of the distance h1 from the center O of the sound emitting hole 112 to the lower side surface LS of the sound generating unit 11 along the Y direction is 2.5 mm to 3.4 mm. In some embodiments, the range of the distance h1 from the center O of the sound emitting hole 112 to the lower side surface LS of the sound generating unit 11 along the Y direction is 2.7 mm to 3.2 mm. In some embodiments, the range of the distance h1 from the center O of the sound emitting hole 112 to the lower side surface LS of the sound generating unit 11 along the Y direction is 2.8 mm to 3.1 mm. In some embodiments, the range of the distance h1 along the Y direction from the center O of the sound output hole 112 to the lower side surface LS of the sound generating unit 11 is 2.9 mm to 3.0 mm.

[0073] In some embodiments, as shown in FIG. 7, in order to ensure that the projection of the sound emitting hole 112 onto the sagittal plane when the open-type earphone 10 is worn can be located partially or entirely within the concha navicular region, when the user wears the open-type earphone 10, the range of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 is 17.5 mm to 27.0 mm, where the upper apex of the ear hook 12 is the point on the ear hook 12 that is closest to the head along the vertical axis direction. In some embodiments, when the user wears the open-type earphone 10, the range of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 is 20.0 mm to 25.5 mm. In some embodiments, when the user wears the open-type earphone 10, the range of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 is 21.0 mm to 24.5 mm. In some embodiments, when a user wears the open-type earphone 10, the range of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 is 22.0 mm to 23.5 mm. In some embodiments, when a user wears the open-type earphone 10, the range of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 is 22.5 mm to 23.0 mm.

[0074] In some embodiments, the ratio of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 to the distance between the upper and lower boundaries of the inner surface IS (i.e., the distance between the upper surface US and the lower surface LS of the sound generating unit 11 or the housing 111) should not be too large or too small. In some embodiments, when the upper surface US and / or the lower surface LS are arc surfaces, the distance between the upper surface US and the lower surface LS may be the distance between a tangent plane that is farthest from the center of the sound generating unit of the upper surface US and parallel to the long axis of the sound generating unit, and a tangent plane that is farthest from the center of the sound generating unit of the lower surface LS and parallel to the long axis of the sound generating unit. When the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 is constant, if the above ratio is too small, the width dimension of the inner surface IS may be too large, in which case the weight of the entire sound generating unit may be large and the distance between the housing and the ear hook may be too small, causing the user to feel uncomfortable wearing the ear hook. If the above ratio is too large, the width dimension of the inner surface IS may be too small, the area in which the transducer of the sound generating unit 11 can push the air is too small, and the sound generating efficiency of the sound generating unit is too low. Therefore, in order to ensure a sufficiently high sound generating efficiency of the sound generating unit, improve the wearing comfort of the user, and position the projection of the sound emitting hole 112 onto the sagittal plane at least partially within the concha navicular region, when the user wears the open-type earphone 10, the ratio of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 to the distance between the upper boundary and the lower boundary of the inner surface IS is 0.95 to 1.55. In some embodiments, the ratio of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 to the width dimension of the housing 111 is 1.05 to 1.45. In some embodiments, the ratio of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 to the width dimension of the housing 111 is 1.15 to 1.35. In some embodiments, the ratio of the distance from the center O of the sound emission hole 112 to the upper apex M of the ear hook 12 to the width dimension of the housing 111 is 1.20 to 1.30.

[0075] In the wearing method of FIG. 7, since the sound output hole 112 is located near the ear canal on the inner surface IS, the ratio of the distance from the center O of the sound output hole 112 to the upper apex M of the ear hook 12 to the upper side surface US of the sound generating unit 11 must not be too large. In addition, in order to ensure that there is a sufficient gap between the sound generating unit 11 and the upper apex M of the ear hook 12 (to prevent the sound generating unit 11 and the ear hook 12 from applying excessive pressure to the ear), the ratio of the distance from the center O of the sound output hole 112 to the upper apex M of the ear hook 12 to the upper side surface US of the sound generating unit 11 must not be too small. In some embodiments, when a user wears the open-type earphone 10, the ratio of the distance from the center O of the sound output hole 112 to the upper apex M of the ear hook 12 to the distance from the center O of the sound output hole 112 to the upper side surface US of the sound generating unit 11 is 1.19 to 2.5. Preferably, the ratio of the distance from the center O of the sound emitting hole 112 to the upper vertex M of the ear hook 12 to the distance from the center O of the sound emitting hole 112 to the upper side surface US of the sound generating unit 11 is 1.5 to 1.8.

[0076] In the wearing method of FIG. 7, since the sound emission hole 112 is located at a position close to the ear canal on the inner surface IS, the ratio of the distance from the center O of the sound emission hole 112 to the upper vertex M of the ear hook 12 and the distance from the center O of the sound emission hole 112 to the lower side surface LS of the sound generating unit 11 must not be too small. In addition, in order to ensure that the sound emission hole has a sufficient area (to prevent the area of ​​the sound emission hole from being too small and causing excessive acoustic resistance), the width of the sound emission hole 112 must not be too small, and the ratio of the distance from the center O of the sound emission hole 112 to the upper vertex M of the ear hook 12 and the distance from the center O of the sound emission hole 112 to the lower side surface LS of the sound generating unit 11 must not be too large. In some embodiments, when a user wears the open-type earphone 10, the ratio of the distance from the center O of the sound emission hole 112 to the upper vertex M of the ear hook 12 and the distance from the center O of the sound emission hole 112 to the lower side surface LS of the sound generating unit 11 is 6.03 to 9.05. Preferably, the ratio of the distance from the center O of the sound emitting hole 112 to the upper vertex M of the ear hook 12 to the distance from the center O of the sound emitting hole 112 to the lower side surface LS of the sound generating unit 11 is 7-8.

[0077] In some embodiments, a cavity structure can be constructed around one of the dual point sound sources to increase the listening volume, especially the listening volume of the mid-low frequency, while still retaining the effect of far-field sound leakage cancellation. Figure 9 is an exemplary distribution schematic diagram of a cavity structure installed around one of the dipole sound sources according to some embodiments of the present specification.

[0078] As shown in FIG. 9, when a cavity structure 41 is installed between dipole sound sources, one of the dipole sound sources and the listening position are inside the cavity structure 41, and the other dipole sound source is outside the cavity structure 41. The sound derived from the dipole sound source inside the cavity structure 41 is restricted by the cavity structure 41, that is, the cavity structure 41 can converge the sound and propagate more of the sound into the listening position, thereby improving the volume and quality of the sound at the listening position. In this specification, the "cavity structure" may be understood as a semi-closed structure surrounded by the side wall of the sound generating unit 11 and the concha structure, and the semi-closed structure does not completely seal and block the inside from the outside environment, but has a leak structure 42 (e.g., an opening, a gap, a duct, etc.) that acoustically communicates with the outside environment. Exemplary leak structures may include, but are not limited to, an opening, a gap, a duct, etc., or any combination thereof.

[0079] In some embodiments, the cavity structure 41 may include a listening position and at least one sound source. Here, "including" may indicate that the listening position and / or the sound source are inside the cavity, or that the listening position and / or the sound source are located at an edge of the interior of the cavity. In some embodiments, the listening position may be the entrance of the ear canal or the acoustic reference point of the ear.

[0080] Fig. 10A is a schematic diagram of the listening principle when a cavity structure is constructed around one of a dipole sound source structure and a dipole sound source according to some embodiments of the present specification. Fig. 10B is a schematic diagram of the sound leakage principle when a cavity structure is constructed around one of a dipole sound source structure and a dipole sound source according to some embodiments of the present specification.

[0081] For near-field listening, in a dipole in which a cavity structure is constructed around one of the sound sources as shown in FIG. 10A, since one of the sound sources A is surrounded by the cavity structure, most of the sound radiated from the sound source reaches the listening position in a direct or reflected manner. In contrast, if there is no cavity structure, most of the sound radiated from the sound source does not reach the listening position. Therefore, by installing a cavity structure, the sound volume reaching the listening position can be significantly increased. Also, only a small part of the anti-phase sound radiated from the anti-phase sound source B outside the cavity structure enters the cavity structure through the leakage structure of the cavity structure. This corresponds to the secondary sound source B' being generated in the leakage structure, and its intensity is significantly smaller than that of the sound source B and significantly smaller than that of the sound source A. The sound generated by the secondary sound source B' has a weak effect of anti-phase cancellation generated for the sound source A in the cavity, thereby significantly increasing the listening volume at the listening position.

[0082] Regarding sound leakage, as shown in Fig. 10B, the sound source A radiates sound to the outside through the leaking structure of the cavity, which is equivalent to the secondary sound source A' being generated in the leaking structure, and since almost all of the sound radiated from the sound source A is output from the leaking structure and the structural scale of the cavity is much smaller (at least one order of magnitude smaller) than the spatial scale for evaluating sound leakage, it is considered that the strength of the secondary sound source A' is equivalent to the strength of the sound source A. The sound cancellation effect generated by the secondary sound source A' and the sound source B in the external space is equivalent to the sound cancellation effect generated by the sound source A and the sound source B. In other words, the cavity structure still maintains a considerable sound leakage reduction effect.

[0083] It should be noted that the above leakage structure with one opening is merely exemplary, and the leakage structure of the cavity structure may include one or more openings, and may achieve a good listening index, and the listening index may be the inverse of the sound leakage index α, 1 / α. Taking a structure with two openings as an example, the following will analyze the cases of equal openings and equal opening ratios. Compared with a structure with only one hole, the "equal openings" here means that two openings of the same size as the structure with only one hole are installed, and the "equal opening ratio" means that the sum of the opening areas of the two installed holes is the same as the structure with only one hole. The equal openings correspond to a structure with only one hole having a relative opening size (i.e., the ratio between the opening area S of the leakage structure in the cavity structure and the area S0 directly affected by the sound source included in the cavity structure) doubled, and as mentioned above, the overall listening index is reduced. Even if the S / S0 ratio is the same as that of a structure with only one hole in the case of equal aperture ratio, the distances from the two openings to the external sound source are different, resulting in different listening indices.

[0084] FIG. 11A is a schematic diagram of a cavity structure with two horizontal openings according to some embodiments of the present specification. FIG. 11B is a schematic diagram of a cavity structure with two vertical openings according to some embodiments of the present specification. As shown in FIG. 11A, when the connecting lines of the two openings are parallel to the connecting lines of the two sound sources (i.e., two horizontal openings), the distances from the two openings to the external sound source are maximum and minimum, respectively, and as shown in FIG. 11B, when the connecting lines of the two openings are perpendicular (i.e., two vertical openings), the distances from the two openings to the external sound source are equal and take an intermediate value.

[0085] FIG. 12 is a comparison diagram of the listening index curves of a cavity structure having two openings and a cavity structure having one opening according to some embodiments of the present disclosure. As shown in FIG. 12, the cavity structure with equal openings has a lower overall listening index than the cavity structure with one opening. For the cavity structure with equal opening ratio, the distances from the two openings to the external sound source are different, resulting in different listening indexes. As can be seen from FIG. 11A, FIG. 11B, and FIG. 12, the listening index of the leak structure with equal opening ratio is higher than that of the leak structure with equal opening ratio, whether it is a horizontal opening or a vertical opening. This is because the relative opening size S / S0 of the leak structure with equal opening ratio is reduced to 1 / 2 compared to the leak structure with equal opening ratio, resulting in a higher listening index. Also, as can be seen from FIG. 11A, FIG. 11B, and FIG. 12, the listening index of the horizontal opening is higher for both the leak structure with equal opening ratio and the leak structure with equal opening ratio. This is because, in the leakage structure of the horizontal openings, the distance from one of the openings to the external sound source is smaller than the distance between the two sound sources, and the distance between the secondary sound source thus formed and the external sound source is closer than the original two sound sources, so that the listening index is higher and the sound leakage reduction effect is further improved. Therefore, in order to improve the sound leakage reduction effect, the distance from at least one opening to the external sound source may be made smaller than the distance between the two sound sources.

[0086] Also, as shown in FIG. 12, the cavity structure using two openings can better improve the resonant frequency of the air sound in the cavity structure compared to the cavity structure with one opening, so that the whole device has a better listening index in the high frequency band (e.g., sound with a frequency close to 10000Hz) compared to the cavity structure with only one opening. The high frequency band is the frequency band where the human ear is more sensitive, so there is a greater need for sound leakage reduction. Therefore, in order to improve the sound leakage reduction effect in the high frequency band, a cavity structure with the number of openings greater than one may be selected.

[0087] Fig. 13 is an exemplary schematic view of an open-type earphone according to some other embodiments of the present specification. Fig. 14 is a schematic view of the ear side of the open-type earphone shown in Fig. 13.

[0088] 13 is similar in structure to the open-type earphone 10 shown in Fig. 7, and the main difference is that the sound generating unit 11 is installed at an angle, and the housing 111 of the sound generating unit 11 is at least partially inserted into the concha cavity 102, and for example, the free end FE of the sound generating unit 11 may be inserted into the concha cavity 102. The ear hook 12 and sound generating unit 11 having such a structure are highly compatible with the user's ear part 100, and can improve the wearing stability of the open-type earphone 10 by increasing the resistance of the open-type earphone 10 to falling off from the ear part 100.

[0089] In some embodiments, when worn, the connection end CE of the sound generating unit 11 is closer to the vertex than the free end FE, as viewed from the thickness direction Z, so that the free end FE is inserted into the cavity of the concha. Based on this, the included angle between the long axis direction X and the direction in which the sagittal axis of the human body is located may be 15° to 60°. If the included angle is too small, it is likely that the free end FE cannot be inserted into the cavity of the concha and the sound output hole 112 of the sound generating unit 11 is too far from the ear canal, and if the included angle is too large, it is likely that the sound generating unit 11 cannot be inserted into the cavity of the concha and the ear canal is blocked by the sound generating unit 11. In other words, by installing in this manner, the sound generating unit 11 can be inserted into the cavity of the concha, and the sound output hole 112 of the sound generating unit 11 has an appropriate distance from the ear canal, so that the ear canal is not blocked and the user can hear more of the sound generated by the sound generating unit 11.

[0090] In some embodiments, the sound generating unit 11 and the ear hook 12 may clamp the ear region corresponding to the cavity of the concha from both the front and rear sides, thereby increasing the resistance of the open-type earphone 10 against falling off from the ear and improving the stability of the open-type earphone 10 when worn. For example, the free end FE of the sound generating unit 11 is pressed into the cavity of the concha in the thickness direction Z. Also, for example, the free end FE abuts against the cavity of the concha in the long axis direction X and the short axis direction Y.

[0091] In some embodiments, since the ear hook itself has elasticity, the distance between the sound generating unit and the ear hook can change a certain amount between the worn state and the unworn state (the distance in the unworn state is smaller than the distance in the worn state). In addition, due to the physiological structure of the ear part 100, the plane on which the sound generating unit 11 is located and the plane on which the ear hook 12 is located must have a certain distance in the coronal axis direction so that the sound generating unit 11 applies an appropriate pressure to the ear part 100. In some embodiments, in order to improve the wearing comfort of the open type earphone 10 and to press the sound generating unit 11 against the ear part by cooperating with the sound generating unit 11 and the ear hook 12, the distance from the center O of the sound output hole 112 to the plane on which the ear hook 12 is located is 3 mm to 6 mm when the ear hook is not worn. Since the ear hook 12 has an irregular shape, for example, the ear hook 12 may have an arc-shaped structure, and the plane on which the ear hook 12 is located (also called the ear hook plane) can be considered to be in contact with at least three points of the ear hook and to constitute the ear hook plane when the ear hook is placed on a plane in an unworn state. In some embodiments, the ear hook can be considered to fit the head approximately in the worn state, and in this case, the deflection of the ear hook plane with respect to the sagittal plane can be ignored. In some embodiments, the distance from the center O of the sound emitting hole 112 to the plane on which the ear hook 12 is located in an unworn state is 3.5 mm to 5.5 mm. In some embodiments, the distance from the center O of the sound emitting hole 112 to the plane on which the ear hook 12 is located in an unworn state is 4.0 mm to 5.0 mm. In some embodiments, the distance from the center O of the sound emitting hole 112 to the plane on which the ear hook 12 is located in an unworn state is 4.3 mm to 4.7 mm.

[0092] As shown in Fig. 13, when a user wears the open-type earphone 10, the housing 111 of the sound generating unit 11 is placed so as to be at least partially inserted into the concha 102, so that the cavity surrounded by the inner surface IS of the sound generating unit 11 and the concha 102 together can be regarded as the cavity structure 41 shown in Fig. 9, and the gap formed between the inner surface IS and the concha (for example, a first leak structure UC formed between the inner surface IS and the concha near the top of the head, and a second leak structure LC formed between the inner surface IS and the ear near the ear canal) can be regarded as the leak structure 42 shown in Fig. 9. The sound emission hole 112 provided on the inner surface IS can be regarded as a point sound source inside the cavity structure 41 shown in Fig. 9, and the decompression hole 113 provided on the other side of the sound generating unit 11 (for example, a side away from or separated from the user's ear canal) can be regarded as a point sound source outside the cavity structure 41 shown in Fig. 9. 9 to 12, when the open-type earphone 10 is worn in such a manner that it is at least partially inserted into the concha, that is, when worn in such a manner as shown in FIG. 13, in terms of the listening effect, most of the sound radiated from the sound emitting hole 112 can reach the ear canal in a direct or reflected manner, and the volume of the sound reaching the ear canal, particularly the listening volume of the mid-low frequency, can be significantly increased. Also, only a small portion of the sound in the opposite phase radiated from the decompression hole 113 enters the concha through the gap (the first leakage structure UC and the second leakage structure LC), and the offsetting effect generated for the sound emitting hole 112 is weak, thereby significantly increasing the listening volume in the ear canal. In terms of the sound leakage effect, the sound emitting hole 112 can output sound to the outside through the gap and offset the sound generated by the decompression hole 113 in the opposite phase in the far field, thereby ensuring the sound leakage reduction effect.

[0093] In some embodiments, as shown in Figs. 13 and 14, when the open-type earphone 10 is worn, the projection of the sound emitting hole 112 onto the sagittal plane can be partially or entirely located within the region of the concha, and the sound emitting hole 112 can be located as close to the ear canal as possible in order to increase the intensity of the sound at the ear canal (i.e., the listening position) of the sound emitting hole 112. In some embodiments, the range of the distance h2 along the Y direction from the center O of the sound emitting hole 112 to the lower side surface LS of the sound generating unit 11 is 4.05 mm to 6.05 mm. In some embodiments, the range of the distance h2 along the Y direction from the center O of the sound emitting hole 112 to the lower side surface LS of the sound generating unit 11 is 4.50 mm to 5.85 mm. In some embodiments, the range of the distance h2 along the Y direction from the center O of the sound emitting hole 112 to the lower side surface LS of the sound generating unit 11 is 4.80 mm to 5.50 mm. In some embodiments, the range of the distance h2 from the center O of the sound output hole 112 to the lower side surface LS of the sound generating unit 11 along the Y direction is 5.20 mm to 5.55 mm.

[0094] In some embodiments, in order to insert the sound generating unit 11 at least partially into the cavity of the concha, the major axis dimension of the sound generating unit 11 must not be too long. On the premise of ensuring that the sound generating unit 11 is at least partially inserted into the cavity of the concha, the distance along the X direction from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 must not be too close, otherwise the area of ​​the sound emitting hole may be entirely or partially blocked by the abutment between the free end FE and the wall surface of the cavity of the concha, and the effective area of ​​the sound emitting hole may be reduced. Therefore, in some embodiments, the range of the distance d2 along the X direction from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 is 8.15 mm to 12.25 mm. In some embodiments, the range of the distance d2 along the X direction from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 is 8.50 mm to 12.00 mm. In some embodiments, the range of the distance d2 from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 along the X direction is 8.85 mm to 11.65 mm. In some embodiments, the range of the distance d2 from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 along the X direction is 9.25 mm to 11.15 mm. In some embodiments, the range of the distance d2 from the center O of the sound emitting hole 112 to the rear side surface RS of the sound generating unit 11 along the X direction is 9.60 mm to 10.80 mm.

[0095] As shown in FIG. 13, in some embodiments, on the premise of ensuring that the sound generating unit 11 is at least partially inserted into the concha cavity, the projection of the sound emitting hole 112 onto the sagittal plane can be located partially or entirely within the concha cavity region, so that when the user wears the open-type earphone 10, the range of the distance between the center O of the sound emitting hole 112 and the upper apex M of the ear hook 12 is 22.5 mm to 34.5 mm. In some embodiments, when the user wears the open-type earphone 10, the range of the distance between the center O of the sound emitting hole 112 and the upper apex M of the ear hook 12 is 25 mm to 32 mm. In some embodiments, when the user wears the open-type earphone 10, the range of the distance between the center O of the sound emitting hole 112 and the upper apex M of the ear hook 12 is 27.5 mm to 29.5 mm. In some embodiments, when the user wears the open-type earphone 10, the range of the distance between the center O of the sound emitting hole 112 and the upper apex M of the ear hook 12 is 28 mm to 29 mm. In some embodiments, when a user wears the open-type earphone 10, the range of the distance between the projection of the center of the sound emission hole 112 onto the sagittal plane and the projection of the upper apex of the ear hook 12 onto the sagittal plane is 18 mm to 30 mm.

[0096] In some embodiments, the ratio of the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 to the distance between the upper and lower boundaries of the inner surface IS (i.e., the distance between the upper surface US and the lower surface LS of the sound generating unit 11 or the housing 111) should not be too large or too small. If the distance from the center O of the sound emitting hole 112 to the upper apex M of the ear hook 12 is constant, if the above ratio is too small, the width dimension of the inner surface IS may be too large, in which case the weight of the entire sound generating unit may be large and the distance between the housing and the ear hook may be too small, causing the user to feel uncomfortable wearing it. If the above ratio is too large, the width dimension of the inner surface IS may be too small, the area where the transducer of the sound generating unit 11 can push the air is too small, and the sound generating efficiency of the sound generating unit is too low. Therefore, in order to ensure a sufficiently high sound generation efficiency of the sound generating unit, improve the wearing comfort of the user, and position the projection of the sound emitting hole 112 on the sagittal plane at least partially within the region of the concha cavity and as close as possible to the ear canal, when the user wears the open-type earphone 10, the ratio of the distance between the center O of the sound emitting hole 112 and the upper apex M of the ear hook 12 to the width dimension of the housing 111 along the Y direction is 1.2 to 2.2. In some embodiments, when the user wears the open-type earphone 10, the ratio of the distance between the center O of the sound emitting hole 112 and the upper apex M of the ear hook 12 to the width dimension of the housing 111 is 1.4 to 2.0. In some embodiments, when the user wears the open-type earphone 10, the ratio of the distance between the center O of the sound emitting hole 112 and the upper apex M of the ear hook 12 to the width dimension of the housing 111 is 1.5 to 1.8. In some embodiments, when a user wears the open-type earphone 10, the ratio of the distance between the center O of the sound emission hole 112 and the upper apex M of the ear hook 12 to the width dimension of the housing 111 is 1.6 to 1.7.

[0097] In the wearing method of FIG. 13, since the sound output hole 112 is located at a position close to the ear canal on the inner surface IS, the ratio of the distance from the center O of the sound output hole 112 to the upper apex M of the ear hook 12 and the distance from the center O of the sound output hole 112 to the upper side surface US of the sound generating unit 11 must not be too large. In addition, in order to ensure that the sound generating unit 11 and the upper apex M of the ear hook 12 are inserted into the concha cavity with a sufficient gap between them, the ratio of the distance from the center O of the sound output hole 112 to the upper apex M of the ear hook 12 and the distance from the center O of the sound output hole 112 to the upper side surface US of the sound generating unit 11 must not be too small. In some embodiments, when the user wears the open-type earphone 10, the ratio of the distance from the center O of the sound output hole 112 to the upper apex M of the ear hook 12 and the distance from the center O of the sound output hole 112 to the upper side surface US of the sound generating unit 11 is 1.94 to 2.93. Preferably, when a user wears the open-type earphone 10, the ratio of the distance from the center O of the sound emission hole 112 to the upper vertex M of the ear hook 12 to the distance from the center O of the sound emission hole 112 to the upper side surface US of the sound generating unit 11 is 2.2 to 2.6.

[0098] In the wearing method of FIG. 13, since the sound emission hole 112 is located at a position close to the ear canal on the inner surface IS, the ratio of the distance from the center O of the sound emission hole 112 to the upper vertex M of the ear hook 12 and the distance from the center O of the sound emission hole 112 to the lower side surface LS of the sound generating unit 11 must not be too small. In addition, in order to ensure that the sound emission hole has a sufficient area (to prevent the area of ​​the sound emission hole from being too small and causing excessive acoustic resistance), the width of the sound emission hole 112 must not be too small, and the ratio of the distance from the center O of the sound emission hole 112 to the upper vertex M of the ear hook 12 and the distance from the center O of the sound emission hole 112 to the lower side surface LS of the sound generating unit 11 must not be too large. In some embodiments, when a user wears the open-type earphone 10, the ratio of the distance from the center O of the sound emission hole 112 to the upper vertex M of the ear hook 12 and the distance from the center O of the sound emission hole 112 to the lower side surface LS of the sound generating unit 11 is 4.50 to 6.76.

[0099] FIG. 15 is a schematic diagram of a sagittal plane projection of an open-type earphone according to some embodiments of the present disclosure in a worn state.

[0100] In some embodiments, as shown in Fig. 13 and Fig. 15, the sound generating unit 11 can be stably attached to the user's ear, the cavity structure as shown in Fig. 9 can be easily formed, and at least two leak structures can be installed in the cavity structure, so that the free end FE can abut in the long axis direction X and the short axis direction Y, and at this time, the inner surface IS of the sound generating unit 11 is inclined with respect to the sagittal plane, and at this time, at least a first leak structure UC (i.e., a gap between the concha cavity and the upper boundary of the inner surface IS) close to the vertex and a second leak structure LC (i.e., a gap between the concha cavity and the lower boundary of the inner surface IS) close to the ear canal are installed between the inner surface IS of the sound generating unit and the concha cavity. This can increase the listening volume, especially the listening volume of the mid-low range, while still retaining the effect of canceling far-field sound leakage, thereby improving the sound output performance of the open-type earphone 10.

[0101] In some embodiments, when the open-type earphone 10 is worn in the manner shown in Fig. 13, the first leakage structure UC and the second leakage structure LC formed between the inner surface IS of the sound generating part and the concha cavity have a certain scale in both the longitudinal axis direction X and the thickness direction Z. In some embodiments, in order to easily understand the positions of the first leakage structure UC and the second leakage structure LC, when the open-type earphone 10 is worn, the midpoint of two points formed by intersecting the upper boundary / lower boundary of the inner surface IS with the ear part (e.g., the side wall of the concha cavity, the helical crus) may be set as the position reference point of the first leakage structure UC and the second leakage structure LC, and the center of the ear canal opening of the ear canal may be set as the position reference point of the ear canal. In some embodiments, in order to easily understand the positions of the first leak structure UC and the second leak structure LC, when the open-type earphone 10 is in a worn state, the midpoint of the upper boundary of the inner surface IS may be set as the position reference point of the first leak structure UC, and the trisection point close to the free end FE of the lower boundary of the inner surface IS (hereinafter, abbreviated as the 1 / 3 point of the lower boundary of the inner surface IS) may be set as the position reference point of the second leak structure LC. In this specification, when the boundary between the inner surface IS and the upper surface US and / or the lower surface LS is arc-shaped, the upper boundary of the inner surface IS may be the intersection line between the inner surface IS and the upper surface US, and the lower boundary of the inner surface IS may be the intersection line between the inner surface IS and the lower surface LS. In some embodiments, when one or more side surfaces (e.g., the inner surface IS, the upper surface US and / or the lower surface LS) of the sound generating unit 11 are arc surfaces, the intersection line between the two side surfaces may be the intersection line between the tangent planes of the two side surfaces that are farthest from the center of the sound generating unit and parallel to the major axis or minor axis of the sound generating unit.

[0102] As a mere example, in this specification, the midpoint of the upper boundary of the inner surface IS and the 1 / 3 point of the lower boundary are respectively taken as the position reference points of the first leakage structure UC and the second leakage structure LC. Note that the midpoint of the upper boundary of the selected inner surface IS and the 1 / 3 point of the lower boundary are only used as exemplary reference points for describing the positions of the first leakage structure UC and the second leakage structure LC. In some embodiments, other reference points may be selected to describe the positions of the first leakage structure UC and the second leakage structure LC. For example, due to differences in the ear parts of different users, the first leakage structure UC / second leakage structure LC formed when the open-type earphone 10 is in a wearing state is a gap whose width gradually changes, and at this time, the reference position of the first leakage structure UC / second leakage structure LC may be a position adjacent to the region where the width of the gap at the upper boundary / lower boundary of the inner surface IS is maximum. For example, the 1 / 3 point adjacent to the free end FE of the upper boundary of the inner surface IS may be the position of the first leakage structure UC, and the midpoint of the lower boundary of the inner surface IS may be the position of the second leakage structure LC.

[0103] In some embodiments, as shown in FIG. 15, the projection of the upper boundary of the inner surface IS onto the sagittal plane may overlap with the projection of the upper surface US onto the sagittal plane, and the projection of the lower boundary of the inner surface IS onto the sagittal plane may overlap with the projection of the lower surface LS onto the sagittal plane. The projection of the position reference point of the first leakage structure UC (i.e., the midpoint of the upper boundary of the inner surface IS) onto the sagittal plane is point A, and the projection of the position reference point of the second leakage structure LC (i.e., 1 / 3 point of the lower boundary of the inner surface IS) onto the sagittal plane is point C, and the "projection point A of the midpoint of the upper boundary of the inner surface IS onto the sagittal plane" may be a projection point of the intersection of the upper boundary of the inner surface IS and the short-axis central plane of the magnetic circuit assembly of the transducer (e.g., the magnetic circuit assembly 1144 described later) onto the sagittal plane. The short-axis central plane of the magnetic circuit assembly is a plane that is parallel to the short-axis direction of the sound generating unit 11 and passes through the geometric center of the magnetic circuit assembly. "Projection point C of the 1 / 3 point of the lower boundary of the medial surface IS onto the sagittal plane" may be the projection point of the trisection point adjacent to the free end FE of the lower boundary of the medial surface IS onto the sagittal plane.

[0104] As shown in Fig. 15, in some embodiments, in the worn state, the projection of the sound generating unit 11 of the open-type earphone 10 on the sagittal plane can at least partially cover the user's ear canal, but the ear canal can communicate with the outside through the concha cavity, thereby realizing the release of both ears of the user. In some embodiments, the sound of the decompression hole 113 can be transmitted to the cavity structure through the leak structure (e.g., the first leak structure UC or the second leak structure LC) and offset with the sound of the sound emission hole 112, so the decompression hole 113 should not be too close to the leak structure, and on the premise that the sound generating unit 11 is at least partially inserted into the concha cavity, the distance between the decompression hole 113 and the sound emission hole 112 is limited by the dimensions of the sound generating unit 11, so that the open-type earphone 10 has a high listening index over the entire frequency band, the decompression hole 113 should be located as far away from the sound emission hole 112 as possible, for example, the decompression hole 113 is installed on the upper side US of the sound generating unit 11. In this case, the ratio of the distance from the projection point O' of the center O of the sound hole 112 onto the sagittal plane to the projection point A of the midpoint of the upper boundary of the inner surface IS onto the sagittal plane to the distance from the projection point O' of the center O of the sound hole 112 onto the sagittal plane to the projection point of the center of the decompression hole 113 onto the sagittal plane is 0.7 to 1.3.

[0105] When the relative position between the sound emitting hole 112 and the decompression hole 113 does not change (i.e., the distance between the sound emitting hole 112 and the decompression hole 113 does not change), the larger the volume V of the cavity structure, the smaller the listening index of the entire open-type earphone 10 (within the entire frequency band). This is because, due to the influence of the aerated resonance in the cavity structure, aerated resonance occurs in the cavity structure at the resonant frequency of the cavity structure, radiating a sound far louder than the decompression hole 113 outward, greatly increasing sound leakage, and further, the listening index becomes significantly smaller near the resonant frequency.

[0106] The greater the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point A of the midpoint of the upper boundary of the inner surface IS onto the sagittal plane, the greater the volume V of the cavity structure. Therefore, in some embodiments, on the premise that the sound generating unit 11 is at least partially inserted into the cavity of the concha, the sound emitting hole 112 can be placed close to the ear canal, and in order to appropriately set the volume V of the cavity structure so as to enhance the sound collection effect of the ear canal, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point A of the midpoint of the upper boundary of the inner surface IS onto the sagittal plane is 10.0 mm to 15.2 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point A of the midpoint of the upper boundary of the inner surface IS onto the sagittal plane is 11.0 mm to 14.2 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point A of the midpoint of the upper boundary of the inner surface IS onto the sagittal plane is 12.0 mm to 14.7 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point A of the midpoint of the upper boundary of the inner surface IS onto the sagittal plane is 12.5 mm to 14.2 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point A of the midpoint of the upper boundary of the inner surface IS onto the sagittal plane is 13.0 mm to 13.7 mm.

[0107] In some embodiments, since the tragus is present near the ear canal opening, the sound emitting hole 112 is likely to be shielded by the tragus. In this case, in order to place the sound emitting hole 112 as close to the ear canal as possible without shielding it, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 2.2 mm to 3.8 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 2.4 mm to 3.6 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 2.6 mm to 3.4 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 2.8 mm to 3.2 mm.

[0108] In some embodiments, in order to ensure that the sound generating unit 11 is inserted into the concha cavity and that there is an appropriate gap (forming a leak structure of the cavity structure) between the upper boundary of the medial surface IS and the concha cavity, the range of the distance from the projection point A of the midpoint of the upper boundary of the medial surface IS onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 12 mm to 18 mm. In some embodiments, the range of the distance from the projection point A of the midpoint of the upper boundary of the medial surface IS onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 13 mm to 17 mm. In some embodiments, the range of the distance from the projection point A of the midpoint of the upper boundary of the medial surface IS onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 14 mm to 16 mm. In some embodiments, the range of the distance from the projection point A of the midpoint of the upper boundary of the medial surface IS onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 14.5 mm to 15.5 mm.

[0109] In some embodiments, in order to ensure that the sound generating unit 11 is inserted into the concha cavity and that there is an appropriate gap (forming a leak structure of the cavity structure) between the lower boundary of the medial surface IS and the concha cavity, the range of the distance from the projection point C of the 1 / 3 point of the lower boundary of the medial surface IS onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 1.7 mm to 2.7 mm. In some embodiments, the range of the distance from the projection point C of the 1 / 3 point of the lower boundary of the medial surface IS onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 1.8 mm to 2.6 mm. In some embodiments, the range of the distance from the projection point C of the 1 / 3 point of the lower boundary of the medial surface IS onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 1.9 mm to 2.5 mm, and in some embodiments, the range of the distance from the projection point C of the 1 / 3 point of the lower boundary of the medial surface IS onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is 2.0 mm to 2.4 mm. In some embodiments, the range of the distance from projection point C of the 1 / 3 point of the lower boundary of the medial surface IS onto the sagittal plane to projection point B of the center of the ear canal opening onto the sagittal plane is 2.1 mm to 2.3 mm.

[0110] In some embodiments, the greater the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point C of the 1 / 3 point of the lower boundary of the inner surface IS onto the sagittal plane, the greater the volume V of the cavity structure. Therefore, on the premise that the sound generating unit 11 is at least partially inserted into the cavity of the concha, in order to appropriately set the volume V of the cavity structure so that the sound emitting hole 112 can be installed close to the ear canal and the sound collection effect of the ear canal is increased, in some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point C of the 1 / 3 point of the lower boundary of the inner surface IS onto the sagittal plane is 3.5 mm to 5.6 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point C of the 1 / 3 point of the lower boundary of the inner surface IS onto the sagittal plane is 3.9 mm to 5.2 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point C of the 1 / 3 point of the lower boundary of the inner surface IS onto the sagittal plane is 4.3 mm to 4.8 mm. In some embodiments, the range of the distance from the projection point O' of the center O of the sound emitting hole 112 onto the sagittal plane to the projection point C of the 1 / 3 point of the lower boundary of the inner surface IS onto the sagittal plane is 4.5 mm to 4.6 mm.

[0111] FIG. 16A is an exemplary internal block diagram of a sound generating unit according to some embodiments of the present disclosure.

[0112] 16A, the sound generating unit 11 may include a main control circuit board 13 installed in the housing 111 and a battery (not shown) installed at one end of the ear hook 12 remote from the sound generating unit 11, and the battery and the transducer 116 are each electrically connected to the main control circuit board 13, so that the battery can supply power to the transducer 116 under the control of the main control circuit board 13. Naturally, both the battery and the transducer 116 may be installed within the sound generating unit 11, and the battery may be closer to the connection end CE, while the transducer 116 may be closer to the free end FE.

[0113] In some embodiments, the open-type earphone 10 may include an adjustment mechanism connecting the sound-generating unit 11 and the ear hook 12, and different users can adjust the relative position of the sound-generating unit 11 in the ear part by the adjustment mechanism while wearing it, so that the sound-generating unit 11 and the concha cavity form a cavity structure. In addition, the existence of the adjustment mechanism allows the user to adjust the earphone 10 to wear it in a more stable and comfortable position.

[0114] Since the concha cavity has a certain volume and depth, after the free end FE is inserted into the concha cavity, there can be a certain distance between the inner surface IS of the sound generating unit 11 and the concha cavity. In other words, the sound generating unit 11 can cooperate with the concha cavity to form a cavity structure communicating with the ear canal in a worn state, and the sound emitting hole 112 can be at least partially located in the cavity structure. In this way, in a worn state, the sound waves propagated from the sound emitting hole 112 are restricted by the cavity structure, that is, the cavity structure can converge the sound waves and better propagate the sound waves into the ear canal, thereby improving the volume and sound quality of the sound heard by the user in the near field, and thus helping to improve the acoustic effect of the earphone 10. Furthermore, since the sound generating unit 11 can be installed so as not to block the ear canal in a worn state, the cavity structure can be installed in a semi-open type. In this way, a part of the sound wave propagated from the sound emission hole 112 propagates to the ear canal to make the user hear the sound, and the other part propagates to the outside of the earphone 10 and the ear through the gap between the sound generating unit 11 and the ear (for example, a part of the concha not covered by the sound generating unit 11) together with the sound reflected in the ear canal, forming a first sound leakage in the far field. At the same time, the sound wave propagated through the decompression hole 113 formed in the sound generating unit 11 generally forms a second sound leakage in the far field, and since the intensity of the first sound leakage and the intensity of the second sound leakage are equal and the phases of the first sound leakage and the second sound leakage are (substantially) opposite to each other, the two can be offset in the far field, thus helping to reduce sound leakage in the far field of the open-type earphone 10.

[0115] In some embodiments, the sound generating unit 11 mainly includes a housing 111 connected to the ear hook 12 and a transducer 116 installed in the housing 111. In the housing 111, a sound emission hole 112 is installed on an inner surface IS facing the ear when the earphones are worn, and sound waves generated by the transducer 116 are transmitted to the ear canal 101 by propagating through the sound emission hole 112. The sound emission hole 112 may be installed on a lower surface LS of the housing 111, or may be installed at a corner between the inner surface IS and the lower surface LS.

[0116] In some embodiments, a front cavity 114 may be formed between the transducer 116 and the housing 111, and the sound emission hole 112 is disposed in an area of ​​the housing 111 that surrounds and forms the front cavity 114, and the front cavity 114 is in communication with the outside via the sound emission hole 112.

[0117] In some embodiments, the front cavity 114 is installed between the diaphragm of the transducer 116 and the housing 111, and the front cavity 114 may have a large depth dimension (i.e., the distance dimension between the diaphragm of the transducer 116 and the housing 111 facing it) to ensure that the diaphragm has a sufficient vibration space. In some embodiments, as shown in FIG. 16A, the sound emission hole 112 is installed on the inner surface IS in the thickness direction Z, and at this time, the depth of the front cavity 114 may be the dimension of the front cavity 114 in the Z direction. However, if the depth of the front cavity 114 is too large, the dimension of the sound generating unit 11 becomes large, which affects the wearing comfort of the open-type earphone 10. In some embodiments, the depth of the front cavity 114 may be 0.55 mm to 1.00 mm. In some embodiments, the depth of the front cavity 114 may be 0.66 mm to 0.99 mm. In some embodiments, the depth of the front cavity 114 may be between 0.76 mm and 0.99 mm. In some embodiments, the depth of the front cavity 114 may be between 0.96 mm and 0.99 mm. In some embodiments, the depth of the front cavity 114 may be 0.97 mm.

[0118] In order to improve the sound emission effect of the open-type earphone 10, the resonance frequency of the Helmholtz resonant cavity-like structure consisting of the front cavity 114 and the sound emission hole 112 is made as high as possible, so that the overall frequency response curve of the sound generating part has a wide flat region. In some embodiments, the resonance frequency f1 of the front cavity 114 may be 3 kHz or more. In some embodiments, the resonance frequency f1 of the front cavity 114 may be 4 kHz or more. In some embodiments, the resonance frequency f1 of the front cavity 114 may be 6 kHz or more. In some embodiments, the resonance frequency f1 of the front cavity 114 may be 7 kHz or more. In some embodiments, the resonance frequency f1 of the front cavity 114 may be 8 kHz or more.

[0119] In some embodiments, the front cavity 114 and the sound outlet 112 can be approximately regarded as a Helmholtz resonant cavity model, where the front cavity 114 is the cavity of the Helmholtz resonant cavity model, and the sound outlet 112 is the neck of the Helmholtz resonant cavity model. In this case, the resonant frequency of the Helmholtz resonant cavity model is the resonant frequency f1 of the front cavity 114. In the Helmholtz resonant cavity model, the dimensions of the neck (e.g., the sound outlet 112) can affect the resonant frequency f of the cavity, and a specific relationship is shown in Equation (2).

[0120]

number

[0121] Here, c represents the speed of sound, S represents the cross-sectional area of ​​the neck portion (e.g., sound emission hole 112), V represents the volume of the cavity (e.g., front cavity 114), and L represents the depth of the neck portion (e.g., sound emission hole 112).

[0122] As can be seen from equation (2), when the cross-sectional area S of the sound emitting hole 112 is increased or the depth L of the sound emitting hole 112 is decreased, the resonance frequency f1 of the front cavity 114 increases and shifts to a higher frequency.

[0123] In some embodiments, the total air volume in the sound outlet 112 forms an acoustic mass, which can resonate with the system (e.g., a Helmholtz resonant cavity) to generate low-frequency output. Thus, a small acoustic mass can affect the low-frequency output of the Helmholtz resonant cavity model. The dimensions of the sound outlet 112 also affect the acoustic mass Ma of the sound outlet 112, and the specific relationship is shown in Equation (3).

[0124]

number

[0125] Here, ρ represents the air density, S represents the cross-sectional area of ​​the sound emitting hole 112, and L represents the depth of the sound emitting hole 112.

[0126] As can be seen from formula (3), by increasing the cross-sectional area S of the sound emitting hole 112 or decreasing the depth L, the acoustic mass Ma of the sound emitting hole 112 decreases.

[0127] As can be seen from formulas (2) and (3), the larger the value of the ratio S / L of the cross-sectional area S to the depth L of the sound emission hole 112, the higher the resonance frequency f1 of the front cavity 114 becomes, and the smaller the acoustic mass Ma of the sound emission hole 112 becomes. Therefore, the ratio S / L of the cross-sectional area S to the depth L of the sound emission hole 112 needs to be within an appropriate value range, and specifically, for example, Figures 17A, 17B, and 18B can be referred to.

[0128] FIG. 16B is an example internal block diagram of a transducer according to some embodiments of the present disclosure.

[0129] As shown in FIG. 16B, the housing 111 accommodates the transducer 116, which includes a vibrating membrane 1141, a voice coil 1142, a frame 1143, and a magnetic circuit assembly 1144. The frame 1143 is installed to surround the vibrating membrane 1141, the voice coil 1142, and the magnetic circuit assembly 1144, and is used to provide a mounting and fixing platform, the transducer 116 can be connected to the housing 111 through the frame 1143, the vibrating membrane 1141 covers the voice coil 1142 and the magnetic circuit assembly 1144 in the Z direction, the voice coil 1142 is inserted into the magnetic circuit assembly 1144, and is connected to the vibrating membrane 1141, and the magnetic field generated after the voice coil 1142 is energized interacts with the magnetic field formed by the magnetic circuit assembly 1144 to drive the vibrating membrane 1141 to generate mechanical vibration, and further generates sound by propagation through a medium such as air, and the sound is output through the sound output hole 112.

[0130] In some embodiments, the magnetic circuit assembly 1144 includes a magnetic flux conducting plate 11441, a magnet 11442, and a housing member 11443, where the magnetic flux conducting plate 11441 and the magnet 11442 are connected to each other, the side of the magnet 11442 away from the magnetic flux conducting plate 11441 is attached to a bottom wall of the housing member 11443, and there is a gap between the peripheral side of the magnet 11442 and the inner peripheral wall of the housing member 11443. In some embodiments, the outer peripheral wall of the housing member 11443 is connected and fixed to the frame 1143. In some embodiments, both the housing member 11443 and the magnetic flux conducting plate 11441 may use a magnetically permeable material (e.g., iron, etc.).

[0131] In some embodiments, the periphery of the vibrating membrane 1141 may be connected to the frame 1143 via a fixing ring 1145. In some embodiments, the material of the fixing ring 1145 may include stainless steel or other metal materials to accommodate the manufacturing process of the vibrating membrane 1141.

[0132] As shown in FIG. 16A and FIG. 16B, in some embodiments, in order to improve the sound output (especially low frequency output) effect of the sound generating unit 11 and improve the ability of the vibrating membrane 1141 to push air, it is preferable that the projected area of ​​the vibrating membrane 1141 along the Z direction is as large as possible. However, if the area of ​​the vibrating membrane 1141 is too large, the dimensions of the transducer 116 will be too large, which will make the housing 111 excessively large and easily cause collision friction between the housing 111 and the auricle, affecting the wearing comfort of the sound generating unit 11. For this reason, it is necessary to design the dimensions of the housing 111. For example, the width dimension of the housing 111 in the Y direction is determined based on the dimension of the concha cavity along the Y direction (e.g., 17 mm), and further, by selecting an appropriate length ratio (i.e., the ratio of the dimension of the housing 111 in the Y direction to the dimension of the housing 111 in the X direction) based on the wearing comfort, the length dimension of the housing 111 in the X direction (e.g., 21.49 mm) can be determined to match the dimension of the concha cavity along the Y direction.

[0133] In some embodiments, the sound generating unit 11 is at least partially inserted into the concha when most users wear the open-type earphone 10 to form a cavity structure with high acoustic effect, and for example, a first leakage structure UC and a second leakage structure LC are formed between the ear part of the user and the sound generating unit 11 when the open-type earphone 10 is worn, so that the dimensions of the housing 111 can use a value in a predetermined range in order to improve the acoustic performance of the earphone. In some embodiments, based on the range of the width dimension of the concha along the Y direction, the width dimension of the housing 111 along the Y direction may be in the range of 11 mm to 16 mm. In some embodiments, the width dimension of the housing 111 along the Y direction may be 11 mm to 15 mm. In some embodiments, the width dimension of the housing 111 along the Y direction may be 13 mm to 14 mm. In some embodiments, the value of the ratio of the dimension of the housing 111 in the X direction to the dimension in the Y direction may be 1.2 to 5. In some embodiments, the value of the ratio of the dimension of the housing 111 in the X direction to the dimension in the Y direction may be 1.4 to 4. In some embodiments, the ratio between the dimension of the housing 111 in the X direction and the dimension of the housing 111 in the Y direction may be 1.5 to 2. In some embodiments, the length dimension of the housing 111 along the X direction may be in the range of 15 mm to 30 mm. In some embodiments, the length dimension of the housing 111 along the X direction may be 16 mm to 28 mm. In some embodiments, the length dimension of the housing 111 along the X direction may be 19 mm to 24 mm. In some embodiments, in order to avoid the housing 111 being too large in volume and affecting the wearing comfort of the open-type earphone 10, the thickness dimension of the housing 111 along the Z direction may be in the range of 5 mm to 20 mm. In some embodiments, the thickness dimension of the housing 111 along the Z direction may be 5.1 mm to 18 mm. In some embodiments, the thickness dimension of the housing 111 along the Z direction may be 6 mm to 15 mm. In some embodiments, the thickness dimension of the housing 111 along the Z direction may be 7 mm to 10 mm.In some embodiments, the area of ​​the inner surface IS of the housing 111 (equal to the product of the length and width dimensions of the housing 111 when the inner surface IS is rectangular) is 90 mm. 2 ~560mm 2 In some embodiments, the area of ​​the inner surface IS may be approximately the projected area of ​​the diaphragm 1141 along the Z direction. For example, the area of ​​the inner surface IS may differ from the projected area of ​​the diaphragm 1141 along the Z direction by 10%. In some embodiments, the area of ​​the inner surface IS may be approximately 150 mm 2 ~360mm 2 In some embodiments, the area of ​​the inner surface IS is 160 mm 2 ~240mm 2 In some embodiments, the area of ​​the inner surface IS is 180 mm 2 ~200mm 2 9 to 12, the open-type earphone 10 is worn in the manner shown in Fig. 13, and the dimensions of the open-type earphone 10 may be smaller than those of a conventional open-type earphone, on the premise that the dimensional design satisfies wearing comfort and the acoustic performance is superior to that of a conventional open-type earphone, that is, the same excellent acoustic performance is achieved.

[0134] As shown in FIGS. 16A and 16B, in some embodiments, the distance along the Z direction from the center O of the sound emission hole 112 to the bottom surface of the magnetic circuit assembly 1144 may be related to the vibration range of the vibrating membrane 1141 and the thickness of the magnetic circuit assembly 1144. The vibration range of the vibrating membrane 1141 may affect the amount of air pushed by the transducer of the sound generating unit 11. The larger the vibration range of the vibrating membrane 1141, the larger the amount of air pushed by the transducer of the sound generating unit 11, and the higher the sound generating efficiency of the sound generating unit. The larger the thickness of the magnetic circuit assembly 1144, the larger the total weight of the sound generating unit 11, which affects the wearing comfort of the user. In addition, when the thickness of the sound generating unit in the Z direction is constant, the smaller the distance along the Z direction from the center O of the sound output hole 112 to the bottom surface of the magnetic circuit assembly 1144, the larger the volume of the rear cavity may be. In this case, as can be seen from the above formula (2), the smaller the resonance frequency of the rear cavity, the lower the resonance peak of the rear cavity moves to, and the smaller the range of the flat region of the frequency response curve becomes. In order to ensure that the sound generating efficiency of the sound generating unit is sufficiently high, the resonance frequency of the rear cavity is within an appropriate frequency range (e.g., 1000Hz to 5000Hz), and the user's wearing is sufficiently comfortable, when the structural strength, the difficulty of realizing the process, and the thickness of the entire housing 111 are taken into consideration comprehensively, the range of the distance l1 along the Z direction from the center O of the sound output hole 112 to the bottom surface of the magnetic circuit assembly 1144 (i.e., the side surface of the housing member 11443 that is away from the sound output hole 112 along the Z direction) is 5.65mm to 8.35mm. In some embodiments, the distance l1 along the Z direction from the center of the sound emitting hole 112 to the bottom surface of the magnetic circuit assembly 1144 ranges from 6.00 mm to 8.00 mm. In some embodiments, the distance l1 along the Z direction from the center of the sound emitting hole 112 to the bottom surface of the magnetic circuit assembly 1144 ranges from 6.35 mm to 7.65 mm. In some embodiments, the distance l1 along the Z direction from the center of the sound emitting hole 112 to the bottom surface of the magnetic circuit assembly 1144 ranges from 6.70 mm to 7.30 mm. In some embodiments, the distance l1 along the Z direction from the center of the sound emitting hole 112 to the bottom surface of the magnetic circuit assembly 1144 ranges from 6.95 mm to 7.05 mm.

[0135] In some embodiments, the range of the distance from the center O of the sound emitting hole 112 to the long axis central plane of the magnetic circuit assembly 1144 (for example, the back surface NN' perpendicular to the paper surface shown in FIG. 13) is 1.45 mm to 2.15 mm. In this specification, the long axis central plane of the magnetic circuit assembly 1144 is a plane that is parallel to the lower side surface LS of the sound generating unit 11 and passes through the geometric center of the magnetic circuit assembly 1144. In other words, the long axis central plane of the magnetic circuit assembly 1144 can divide the magnetic circuit assembly 1144 into two equal parts along the direction X. The distance from the center O of the sound emitting hole 112 to the long axis central plane of the magnetic circuit assembly 1144 is the distance along the short axis direction Y from the center O of the sound emitting hole 112 to the long axis central plane. In some embodiments, the range of the distance from the center O of the sound emitting hole 112 to the long axis central plane is 1.55 mm to 2.05 mm. In some embodiments, the range of the distance from the center O of the sound emitting hole 112 to the long axis central surface is 1.65 mm to 1.95 mm. In some embodiments, the range of the distance from the center O of the sound emitting hole 112 to the long axis central surface is 1.75 mm to 1.85 mm.

[0136] 17A is a frequency response curve diagram of an open-type earphone corresponding to different cross-sectional areas of sound emission holes when the aspect ratio is constant, according to some embodiments of the present disclosure. FIG. 17A shows a frequency response curve diagram of an open-type earphone corresponding to different cross-sectional areas of sound emission holes when the aspect ratio of the sound emission holes is constant, when other structures (e.g., decompression hole 113, rear cavity volume, etc.) are fixed, and the cross-sectional area of ​​the sound emission holes is 0.44 mm 2 ~100.43mm 217A shows a frequency response curve corresponding to the open-type earphone 10 within the range. As can be seen from FIG. 17A, under the above conditions, as the cross-sectional area S of the sound emission hole 112 gradually increases, the resonance frequency f1 (i.e., the frequency corresponding to the resonance peak at the dashed circle G) corresponding to the front cavity in the frequency response curve of the open-type earphone 10 gradually moves to a higher frequency, and the resonance frequency corresponding to the rear cavity is always maintained at about 4.5 kHz. Specifically, as the cross-sectional area S of the sound emission hole 112 increases, the resonance peak of the front cavity gradually moves to a higher frequency, and when it moves to about 4.5 kHz, the resonance frequencies of the front cavity and the rear cavity may be almost equal, and in this process, the peak value of the resonance peak is almost unchanged. After the resonance peak of the front cavity moves to 4.5 kHz, if the cross-sectional area S of the sound emission hole 112 continues to increase, the peak value of the resonance peak of the front cavity obviously shows a tendency to gradually decrease. Therefore, in some embodiments, in order to provide a wide flat region in the frequency response curve of the open-type earphone 10, the cross-sectional area S of the sound emission hole 112 is set to 2.87 mm 2 Preferably, in order to make the frequency response curve of the open-type earphone 10 flat in the range of 100 Hz to 2.3 kHz, the cross-sectional area S of the sound emission hole 112 is set to 4.0 mm 2 Preferably, in order to make the frequency response curve of the open-type earphone 10 flat in the range of 100 Hz to 3.3 kHz, the cross-sectional area S of the sound emission hole 112 is set to 7.0 mm 2 It may be larger than.

[0137] Furthermore, within a certain range of the cross-sectional area S of the sound emitting hole 112, as the cross-sectional area S of the sound emitting hole 112 increases, the resonance peak of the front cavity moves to higher frequencies and the peak value gradually decreases. Therefore, in some embodiments, in order to improve the sound quality of the open-type earphone 10 and to facilitate EQ adjustment, the frequency response of the open-type earphone 10 needs to be sufficient in the high frequency range (e.g., 4.5 kHz to 9 kHz), and the cross-sectional area S of the sound emitting hole 112 is set to 54 mm. 2Preferably, the cross-sectional area S of the sound emission hole 112 is set to 36.15 mm in order to ensure that the frequency response curve of the open-type earphone 10 is sufficient within the range of 4.5 kHz to 8 kHz. 2 More preferably, the cross-sectional area S of the sound emission hole 112 may be set to 21.87 mm in order to ensure that the frequency response curve of the open-type earphone 10 is within the range of 4.5 kHz to 6.5 kHz. 2 For convenience of explanation, in this specification, the cross-sectional area S of the sound output hole 112 may be the area of ​​the outer opening of the sound output hole 112 (i.e., the opening area on the inner surface of the sound output hole 112). Note that in some other embodiments, the cross-sectional area S of the sound output hole 112 may be the area of ​​the inner opening of the sound output hole 112 or the average value of the inner opening area and the outer opening area of ​​the sound output hole 113.

[0138] 17B is a frequency response curve diagram of a front cavity corresponding to sound emission holes with different cross-sectional areas according to some embodiments of the present disclosure. As shown in FIG. 17B, when the cross-sectional area S of the sound emission hole 112 is 2.875 mm 2 From 46.10 mm 2 When the acoustic mass of the sound outlet 112 increases to a is 800kg / m 4 From 50kg / m 4 The resonance frequency f1 of the front cavity gradually increases from about 4 kHz to about 8 kHz. 4 and 800 kg / m 4 The parameters such as above represent only the theoretical acoustic mass of the sound emission hole 112 and may have errors from the actual acoustic mass of the sound emission hole 112.

[0139] The acoustic output effect of the open-type earphone 10 is improved, the resonance frequency f1 of the front cavity is increased, and the acoustic mass M aIn order to ensure that the cross-sectional area S of the sound emitting hole 112 is sufficiently large, the cross-sectional area S of the sound emitting hole 112 needs to be within an appropriate value range. In addition, in actual design, if the cross-sectional area of ​​the sound emitting hole 112 is too large, it will have a certain impact on other aspects of the open-type earphone 10, such as the appearance, structural strength, waterproofness, and dustproofness. In some embodiments, the value range of the cross-sectional area S of the sound emitting hole 112 is 2.87 mm 2 ~46.10mm 2 In some embodiments, the range of values ​​for the cross-sectional area S of the sound emission hole 112 is 2.875 mm 2 ~46mm 2 In some embodiments, the value of the cross-sectional area S of the sound emission hole 112 may range from 10 mm 2 ~30mm 2 In some embodiments, the value of the cross-sectional area S of the sound emission hole 112 may be 25.29 mm 2 In some embodiments, the range of values ​​for the cross-sectional area S of the sound emission hole 112 is 25 mm 2 ~26mm 2 may be also possible.

[0140] In some embodiments, in order to improve the wearing stability of the open-type earphone 10, the area of ​​the inner surface IS of the sound generating unit 11 must be adapted to the dimensions of the human concha cavity. When the sound generating unit 11 is worn so as to be inserted into the concha cavity, the inner surface IS and the side wall of the concha cavity form a cavity structure, so that the sound generating efficiency of the sound generating unit 11 is higher than that of a conventional wearing method (for example, the sound generating unit 11 is placed in front of the tragus). In this case, the dimensions of the entire sound generating unit can be designed to be small, so that the area ratio of the sound output hole 112 to the inner surface IS can be designed to be large. In addition, the area of ​​the sound output hole must not be too large, otherwise it will affect the stability of the waterproof and dustproof structure and the support structure at the sound output hole, and the area of ​​the inner surface IS must not be too small, otherwise it will affect the area where the transducer pushes the air. In some embodiments, the ratio of the cross-sectional area S of the sound output hole 112 to the area of ​​the inner surface IS may be 0.015 to 0.25. In some embodiments, the ratio of the cross-sectional area S of the sound output hole 112 to the area of ​​the inner surface IS may be 0.02 to 0.2. In some embodiments, the ratio of the cross-sectional area S of the sound output hole 112 to the area of ​​the inner surface IS may be 0.06 to 0.16. In some embodiments, the ratio of the cross-sectional area S of the sound output hole 112 to the area of ​​the inner surface IS may be 0.1 to 0.12.

[0141] In some embodiments, in consideration of the need for the inner surface IS to contact the ear (e.g., the cavity of the concha), the inner surface IS may be designed to have a non-planar structure to improve wearing comfort. For example, the edge region of the inner surface IS has a certain curvature angle with respect to the central region, or a protruding structure is provided in the region of the inner surface IS adjacent to the free end FE so as to better abut against the ear region or the like. In this case, in order to better reflect the effect of the cross-sectional area of ​​the sound output hole 112 on the wearing stability and sound generation efficiency of the open-type earphone 10, the ratio of the cross-sectional area S of the sound output hole 112 to the area of ​​the inner surface IS may be replaced with the ratio of the cross-sectional area S of the sound output hole 112 to the projected area of ​​the inner surface IS in the vibration direction of the diaphragm (i.e., the Z direction in FIG. 16A). In some embodiments, the ratio of the cross-sectional area S of the sound output hole 112 to the projected area of ​​the inner surface IS in the vibration direction of the diaphragm may be 0.016 to 0.255. Preferably, the ratio of the cross-sectional area S of the sound emission hole 112 to the projected area of ​​the inner surface IS in the vibration direction of the diaphragm may be 0.022 to 0.21.

[0142] In some embodiments, the projected area of ​​the transducer's diaphragm in its vibration direction may be equal to or slightly smaller than the projected area of ​​the inner surface IS in its vibration direction. In this case, the ratio of the cross-sectional area S of the sound output hole 112 to the projected area of ​​the diaphragm in its vibration direction may be 0.016 to 0.261. Preferably, the ratio of the cross-sectional area S of the sound output hole 112 to the projected area of ​​the inner surface IS in the vibration direction of the diaphragm may be 0.023 to 0.23.

[0143] In some embodiments, the shape of the sound emitting hole 112 also affects the acoustic resistance of the sound emitting hole 112. The narrower the sound emitting hole 112, the larger the acoustic resistance of the sound emitting hole 112, which is detrimental to the acoustic output of the front cavity 114. Therefore, to ensure that the sound emitting hole 112 has an appropriate acoustic resistance, the ratio of the long axis dimension to the short axis dimension of the sound emitting hole 112 (also called the aspect ratio of the sound emitting hole 112) needs to be within a preset appropriate value range.

[0144] In some embodiments, the shape of the sound emission hole 112 may include, but is not limited to, a circle, an ellipse, a racetrack shape, and the like. For convenience of explanation, the following will exemplarily explain an example in which the sound emission hole 112 is set to a racetrack shape. In some embodiments, as shown in FIG. 14, the sound emission hole 112 may use a racetrack shape, and both ends of the racetrack shape may be minor arc shapes or semicircular shapes. In this case, the major axis dimension of the sound emission hole 112 may be the maximum dimension of the sound emission hole 112 in the X direction (major axis dimension d shown in FIG. 14), and the minor axis dimension of the sound emission hole 112 may be the maximum dimension of the sound emission hole 112 in the Y direction (minor axis dimension h shown in FIG. 14).

[0145] Fig. 18A shows frequency response curves of open-type earphones corresponding to sound output holes with different aspect ratios according to some embodiments of the present specification. Fig. 18A shows frequency response curves of open-type earphones corresponding to sound output holes with aspect ratios of 1, 3, 5, 8, and 10, respectively, when other structures (e.g., decompression hole 113, rear cavity volume, etc.) are fixed and the area of ​​the sound output hole is constant.

[0146] As can be seen from FIG. 18A, when the cross-sectional area of ​​the sound emitting hole 112 is constant, as the aspect ratio of the sound emitting hole 112 increases, the resonance frequency f1 of the resonance peak of the front cavity 114 gradually moves to a higher frequency, and the intensity of the resonance peak gradually decreases. Therefore, when the cross-sectional area of ​​the sound emitting hole 112 is constant, in order to ensure that the intensity of the resonance peak of the front cavity is sufficiently strong, the range of the ratio between the major axis dimension of the sound emitting hole 112 and the minor axis dimension of the sound emitting hole 112 may be 1 to 10. In some embodiments, the range of the ratio between the major axis dimension of the sound emitting hole 112 and the minor axis dimension of the sound emitting hole 112 may be 2 to 8. The range of the ratio between the major axis dimension of the sound emitting hole 112 and the minor axis dimension of the sound emitting hole 112 may be 2 to 4. In some embodiments, the major axis dimension of the sound emitting hole 112 may be 7.67 mm, and the minor axis dimension of the sound emitting hole 112 may be 3.62 mm.

[0147] 18B is a frequency response curve diagram of the front cavity corresponding to the sound outlet holes with different depths according to some embodiments of the present disclosure. As shown in FIG. 18B, when the depth L of the sound outlet hole 112 increases from 0.3 mm to 3 mm, the acoustic mass Ma of the sound outlet hole 112 increases from 100 kg / m 4 to 1000kg / m 4 and the resonance frequency f1 of the front cavity decreases from about 7 kHz to about 3.7 kHz.

[0148] In order to ensure that the front cavity has a sufficiently large resonant frequency, according to formula (2), the value of the depth L of the sound emission hole 112 is preferably as small as possible. However, since the sound emission hole 112 is installed in the housing 111, the depth of the sound emission hole 112 is the thickness of the side wall of the housing 111. If the thickness of the housing 111 is too small, it may affect the structural strength of the open-type earphone 10, and the corresponding processing process will also be difficult. In some embodiments, the value of the depth L of the sound emission hole 112 may range from 0.3 mm to 3 mm. In some embodiments, the value of the depth L of the sound emission hole 112 may range from 0.3 mm to 2 mm. In some embodiments, the value of the depth L of the sound emission hole 112 may be 0.3 mm. In some embodiments, the value of the depth L of the sound emission hole 112 may be 0.6 mm.

[0149] In some embodiments, according to formula (2), when the volume of the front cavity is not likely to change, the ratio S / L of the cross-sectional area S of the sound emission hole 112 to the square of the depth L is 2 The larger the ratio S / L, the higher the resonant frequency of the front cavity, and the more effective the sound emitted from the sound hole in the low to mid frequency range. However, the cross-sectional area S of the sound hole 112 must not be too large, and the depth L (thickness of the housing 111) must not be too small. Therefore, in some embodiments, the ratio S / L of the cross-sectional area S of the sound hole 112 to the square of the depth L is 2 The value of may range from 0.31 to 512.2. In some embodiments, the ratio S / L of the cross-sectional area S of the sound emission hole 112 to the square of the depth L 2The value of may range from 1 to 400. In some embodiments, the ratio S / L of the cross-sectional area S of the sound emission hole 112 to the square of the depth L 2 The value of may range from 3 to 300. In some embodiments, the ratio S / L of the cross-sectional area S of the sound emission hole 112 to the square of the depth L 2 The value of may range from 5 to 200. In some embodiments, the ratio S / L of the cross-sectional area S of the sound emission hole 112 to the square of the depth L 2 The value may range from 10 to 50.

[0150] Although the basic concept has been described above, it is clear to those skilled in the art that the above detailed disclosure is merely given as an example and does not limit the present application. Although not explicitly described in this specification, those skilled in the art can make various changes, improvements and modifications to the present application. These changes, improvements and modifications are intended to be suggested by the present application and therefore still fall within the spirit and scope of the exemplary embodiments of the present application. [Explanation of symbols]

[0151] 10 Open-type earphones 11 Sound generating unit 12 Ear hooks 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 Tragus 111 Housing 112 Sound emission hole 113 Pressure reduction hole 114 Front Cavity 116 Transducer 1071 Helical foot 1141 Vibrating membrane 1145 Fixing ring 1142 Voice coil 1143 Frame 1144 Magnetic Circuit Assembly 11441 Magnetic Flux Conducting Plate 11442 Magnet 11443 Storage material

Claims

1. an acoustic generating unit including a transducer and a housing that accommodates the transducer; an ear hook, in a worn state, having a first portion that is hung between a user's auricle and the head, and a second portion that extends to a side of the auricle away from the head and is connected to the sound generating unit, for fixing the sound generating unit at a position near the ear canal so as not to block the ear canal; An open-type earphone, wherein a sound emission hole is formed on an inner surface of the housing facing the auricle, through which sound generated by the transducer is guided out of the housing and transmitted to the ear canal, and the ratio of an area of ​​the sound emission hole to an area of ​​the inner surface on which the sound emission hole is formed is 0.015 to 0.

25.

2. In the worn state, the housing is at least partially inserted into the cavity of the concha, and the cross-sectional area of ​​the sound emission hole is 2.87 mm ２ ~46.10mm ２ and the area of ​​the inner surface is 160 mm ２ ~240mm ２ 2. The open-type earphone according to claim 1,

3. 3. The open-type earphone according to claim 2, wherein a ratio of a cross-sectional area of ​​the sound emission hole to a square of a depth of the sound emission hole is 0.31 to 512.

2.

4. The open-type earphone according to claim 3 , wherein the depth of the sound emission hole ranges from 0.3 mm to 3 mm.

5. The open-type earphone according to claim 2 , wherein the range of the distance from the center of the sound emission hole to the lower surface of the sound generating portion is 4.05 mm to 6.05 mm.

6. The open-type earphone according to claim 2 , wherein the range of the distance from the center of the sound emission hole to the rear side surface of the sound generating unit is 8.15 mm to 12.25 mm.

7. 3. The open-type earphone according to claim 2, wherein the transducer includes a magnetic circuit assembly that provides a magnetic field, and a distance from a center of the sound emission hole to a bottom surface of the magnetic circuit assembly ranges from 5.65 mm to 8.35 mm.

8. The open-type earphone according to claim 7, wherein a range of a distance from the center of the sound emission hole to a longitudinal center plane of the magnetic circuit assembly is 1.45 mm to 2.15 mm.

9. 3. The open-type earphone according to claim 2, wherein, when the earphone is worn, the range of the distance between the center of the sound emission hole and the upper apex of the ear hook is 22.5 mm to 34.5 mm.

10. 3. The open-type earphone according to claim 2, wherein, when the earphone is worn, the range of the distance from the projection of the center of the sound emission hole onto the sagittal plane to the projection of the upper apex of the earhook onto the sagittal plane is 18 mm to 30 mm.

11. The open-type earphone according to claim 9, wherein, in a worn state, the ratio of the distance from the center of the sound emission hole to the upper apex of the earhook to the distance between the upper boundary and the lower boundary of the inner surface is 1.2 to 2.

2.

12. The open-type earphone according to claim 9, wherein, when the earphone is worn, the ratio of the distance from the center of the sound emission hole to the upper apex of the earhook to the distance from the center of the sound emission hole to the upper side surface of the sound generating unit is 1.94 to 2.

93.

13. The open-type earphone according to claim 2, wherein a range of a distance from a projection point of the center of the sound emission hole onto a sagittal plane to a projection point of a center of the ear canal opening of the ear canal onto the sagittal plane is 2.2 mm to 3.8 mm.

14. The open-type earphone according to claim 13, wherein a range of a distance from a projection point of the center of the sound emission hole onto the sagittal plane to a projection point of a midpoint of an upper boundary of the inner surface onto the sagittal plane is 10.0 mm to 15.2 mm.

15. The open-type earphone according to claim 14, wherein a range of a distance from a projection point of the midpoint of the upper boundary of the inner surface onto the sagittal plane to a projection point of the center of the ear canal opening onto the sagittal plane is 12 mm to 18 mm.

16. The open-type earphone according to claim 13, wherein the range of the distance from the projection point of the center of the sound emission hole onto the sagittal plane to the projection point of a 1 / 3 point of the lower boundary of the inner surface onto the sagittal plane is 3.5 mm to 5.6 mm.

17. The open-type earphone according to claim 16, wherein a range of a distance from a projection point of the ⅓ point of the lower boundary of the inner surface onto the sagittal plane to a projection point of the center of the ear canal opening onto the sagittal plane is 1.7 mm to 2.7 mm.

18. The open-type earphone according to claim 1, wherein, in a worn state, the housing is at least partially located in the antihelix, and the range of the distance from the center of the sound emission hole to the underside of the sound generating portion is 2.3 mm to 3.6 mm.

19. The open-type earphone according to claim 18, wherein a range of a distance from the center of the sound emission hole to a rear side surface of the sound generating unit is 9.5 mm to 15.0 mm.

20. The open-type earphone according to claim 18, wherein, in a worn state, the range of the distance between the center of the sound emission hole and the upper apex of the ear hook is 17.5 mm to 27.0 mm.

21. The open-type earphone according to claim 20, wherein, in a worn state, the ratio of the distance from the center of the sound emission hole to the upper apex of the earhook to the distance between the upper boundary and the lower boundary of the inner surface is 0.95 to 1.

55.

22. The open-type earphone according to claim 20, wherein, in a worn state, the ratio of the distance from the center of the sound emission hole to the upper vertex of the earhook to the distance from the center of the sound emission hole to the upper side surface of the sound generating unit is 1.19 to 2.

50.

23. The open-type earphone according to claim 1 , wherein the distance between the center of the sound emission hole and the plane on which the ear hook is located is 3 mm to 6 mm.

24. 2. The open-type earphone according to claim 1, wherein a ratio of a major axis dimension of the sound emission hole to a minor axis dimension of the sound emission hole is in a range of 1 to 10.

25. The open-type earphone according to claim 24, wherein a ratio of the major axis dimension of the sound emission hole to the minor axis dimension of the sound emission hole is in a range of 2 to 4.

26. an acoustic generating unit including a transducer and a housing that accommodates the transducer; an ear hook, in a worn state, having a first portion that is hung between a user's auricle and the head, and a second portion that extends to a side of the auricle away from the head and is connected to the sound generating unit, for fixing the sound generating unit at a position near the ear canal so as not to block the ear canal; The transducer includes a diaphragm, and a sound emission hole is formed on the inner surface of the housing facing the auricle, which guides sound generated by vibration of the diaphragm out of the housing and transmits it to the ear canal, and the ratio of the area of ​​the sound emission hole to the projected area of ​​the diaphragm in the vibration direction is 0.016 to 0.

261.

27. In the worn state, the housing is at least partially inserted into the cavity of the concha, and the cross-sectional area of ​​the sound emission hole is 2.87 mm ２ ~46.10mm ２ The projected area of ​​the diaphragm in the vibration direction is 150 mm ２ ~230mm ２ 27. The open-type earphone according to claim 26,

28. an acoustic generating unit including a transducer and a housing that accommodates the transducer; an ear hook, in a worn state, having a first portion that is hung between a user's auricle and the head, and a second portion that extends to a side of the auricle away from the head and is connected to the sound generating unit, for fixing the sound generating unit at a position near the ear canal so as not to block the ear canal; The transducer includes a diaphragm, and a sound emission hole is formed on the inner surface of the housing facing the auricle, which guides sound generated by vibration of the diaphragm out of the housing and transmits it to the ear canal, and the distance between the center of the sound emission hole and the upper apex of the ear hook is in the range of 22.5 mm to 34.5 mm.

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