Ear cuff type earphones

Abstract

An ear cuff-type earphone according to an embodiment of the present specification includes a sound generating unit configured to be positioned in the concha cavity of a wearer and to contact the inner wall of the concha cavity, the sound generating unit including a housing forming an accommodating cavity, a sound generating assembly accommodated in the accommodating cavity, and a sound emitting hole located in the housing and configured to direct sound generated by the sound generating assembly, the sound emitting hole having a partial area blocked by the wall of the concha cavity; a contact portion configured to contact the back of the wearer's ear; and an ear hook configured to connect the sound generating unit and the contact portion by bypassing the wearer's antihelix and helix.

Description

[Technical Field]

[0001] This application relates to the field of sound generating devices, and in particular to ear cuff type earphones.

[0002] [Incorporated by reference] This application claims priority to a Chinese application filed on December 11, 2023, bearing application number 202311701969.7, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] With the development of audio output technology, audio devices (e.g., earphones) have been widely applied in people's daily lives, and can be used in combination with electronic devices such as mobile phones and computers to provide users with audio playback. Ear cuff earphones are a new type of earphone, usually small, and can be used by clipping them onto the wearer's earlobe. Furthermore, ear cuff earphones do not block the ear canal, ensuring safety in outdoor scenarios and providing greater wearing comfort than canal-type earphones. However, due to their limited size, ear cuff earphones have problems such as insufficient volume and the need to improve sound quality.

[0004] Therefore, there is a need to provide an ear cuff earphone that improves the output performance of the ear cuff earphone. Summary of the Invention

[0005] An ear cuff-type earphone according to an embodiment of the present specification includes a sound generating unit configured to be positioned in the concha cavity of a wearer and to contact the inner wall of the concha cavity, the sound generating unit including a housing forming an accommodating cavity, a sound generating assembly accommodated in the accommodating cavity, and a sound emitting hole located in the housing and configured to direct sound generated by the sound generating assembly, the sound emitting hole having a partial area blocked by the wall of the concha cavity; a contact portion configured to contact the back of the wearer's ear; and an ear hook configured to connect the sound generating unit and the contact portion by bypassing the wearer's antihelix and helix.

[0006] In some embodiments, the ear hook has a first plane of symmetry, an outer end surface of the sound emission hole is projected onto the first plane of symmetry to form an arc-shaped segment, and a projection of the housing onto the first plane of symmetry has an arc-shaped outer contour, and at least a portion of the arc-shaped outer contour overlaps with the arc-shaped segment.

[0007] In some embodiments, the housing has a feature point that is in contact with the abutment portion or closest to the abutment portion, the feature point is projected onto the first symmetry plane to form a first projection point, and an arc length between the end point of the arc-shaped segment that is closer to the first projection point and the first projection point is in the range of 1.7 mm to 4.5 mm.

[0008] In some embodiments, an arc length between the first projection point and one of the two end points of the arc-shaped segment that is farther from the first projection point is within a range of 12 mm to 15.5 mm.

[0009] In some embodiments, the housing is projected onto the first plane of symmetry to form a first projection, the abutment portion is projected onto the first plane of symmetry to form a second projection, a tangent to a lower end point of the first projection and a lower end point of the second projection is a common tangent, and a first point of contact between the common tangent and the first projection is on the arc-shaped segment.

[0010] In some embodiments, a ratio of an arc length from a first end point of the arc-shaped segment to the first tangent point to an arc length from a second end point of the arc-shaped segment to the first tangent point is within a range of 0.5 to 0.85, the first end point being the end point closer to the first projection point of the two end points of the arc-shaped segment, the second end point being the end point farther from the first projection point of the two end points of the arc-shaped segment, and the second end point of the arc-shaped segment being closer to the ear canal.

[0011] In some embodiments, a normal to the first tangent point and a normal to the first endpoint or a normal to the second endpoint of the arc-shaped segment intersect at a center point, a line connecting the first endpoint and the center point and a line connecting the first tangent point and the center point form a first included angle, a line connecting the second endpoint and the center point and a line connecting the first tangent point and the center point form a second included angle, and a ratio of the first included angle to the second included angle is within a range of 0.2 to 1.3.

[0012] In some embodiments, the first included angle is in the range of 15° to 55°.

[0013] In some embodiments, the second included angle is in the range of 40° to 80°.

[0014] In some embodiments, the arc length of the arc-shaped segment is in the range of 5.2 mm to 16.7 mm, and the width of the sound emission hole is in the range of 1.4 mm to 2.2 mm.

[0015] In some embodiments, the ratio of the arc length of the arc segment to the length of the straight line segment between the first and second endpoints of the arc segment is in the range of 1.05 to 1.4.

[0016] In some embodiments, the ear hook has a first plane of symmetry, and the sound emission hole is located on one side of the first plane of symmetry.

[0017] In some embodiments, the sound emission hole has an elongated outer end surface, the outer end surface has a second plane of symmetry parallel to the longitudinal extension direction of the outer end surface, and the included angle between the first plane of symmetry and the second plane of symmetry is in the range of 15° to 45°.

[0018] In some embodiments, the outer end surface of the sound emission hole is projected onto the first symmetry plane to form an arc-shaped segment, the ear cuff type earphone further includes a decompression hole, and the shortest straight-line distance between the projection point of the center of the decompression hole onto the first symmetry plane and the arc-shaped segment is within a range of 8.1 mm to 11 mm.

[0019] In some embodiments, the housing has a feature point that is in contact with the abutment portion or closest to the abutment portion, the feature point is projected onto the first symmetry plane to form a first projection point, the ear cuff type earphone further includes a decompression hole, and the arc length between the projection point of the center of the decompression hole onto the first symmetry plane and the first projection point is in the range of 7.5 mm to 9.5 mm.

[0020] In some embodiments, the ear hook has a first plane of symmetry, the sound emission hole has an elongated outer end surface, the outer end surface has a second plane of symmetry parallel to the longitudinal extension direction of the outer end surface, and the second plane of symmetry is perpendicular to the first plane of symmetry.

[0021] In some embodiments, the sound emission hole has a central axis that is located on the first plane of symmetry.

[0022] In some embodiments, the ear cuff earphone further includes two decompression holes symmetrically disposed with respect to the first plane of symmetry.

[0023] In some embodiments, the sound emission hole has a central axis that is offset from the first plane of symmetry.

[0024] In some embodiments, the housing has a feature point that is in contact with the abutment portion or closest to the abutment portion, the feature point is projected onto the first plane of symmetry to form a first projection point, and the linear distance between the center of projection of the outer end surface of the sound emission hole onto the first plane of symmetry and the first projection point is within a range of 7.0 mm to 8.5 mm.

[0025] In some embodiments, the sound generation assembly includes two audio drivers, a first audio transmission passage is formed between the diaphragms of the two audio drivers, the sound emission hole is in acoustic communication with the first audio transmission passage, and the first audio transmission passage forms a front cavity or a part of a front cavity of the two audio drivers.

[0026] In some embodiments, each of the audio drivers includes a magnet and a magnetic flux conducting cover spaced apart from the corresponding diaphragm, and a supporting frame, wherein a plurality of air vents are provided in the frame and / or the magnetic flux conducting cover, a second audio transmission passage is formed between the two frames, and the rear surfaces of the two diaphragms are acoustically connected to the second audio transmission passage through the air vents on the frames, and the second audio transmission passage forms a rear cavity or a part of a rear cavity of the two audio drivers.

[0027] In some embodiments, the difference between the resonant frequency of the front cavity and the resonant frequency of the rear cavity is in the range of 0.5 KHz to 1.5 KHz.

[0028] In some embodiments, the resonant frequency of the front cavity is lower than 6 KHz.

[0029] In some embodiments, the resonant frequency of the rear cavity is higher than 4.5 KHz.

[0030] In some embodiments, the area of ​​the sound emission hole is 5 mm 2 ~18mm 2 is within the range.

[0031] In some embodiments, the volume of the front cavity is 60 mm 3 ~120mm 3 is within the range.

[0032] In some embodiments, the area of ​​the decompression hole is 6 mm 2 ~15mm 2 is within the range.

[0033] In some embodiments, the volume of the rear cavity is 80 mm 3 ~180mm 3 is within the range.

[0034] In some embodiments, the ventilation holes on the two frames are located on either side of the first plane of symmetry, and the decompression holes extend along a direction perpendicular to the first plane of symmetry.

[0035] In some embodiments, the two ends of the decompression hole extend to the vent holes on the two frames, respectively.

[0036] In some embodiments, the two ends of the vacuum hole have a larger opening size than a middle portion of the vacuum hole.

[0037] In some embodiments, the housing includes a first rigid housing, a second rigid housing, and a first flexible portion that contacts the wearer's concha cavity, the first rigid housing and the second rigid housing surrounding each other to form the accommodating cavity, the first flexible portion covering an outer wall of the second rigid housing, and the sound emission holes located in the second rigid housing and the first flexible portion.

[0038] In some embodiments, the ear hook has a first plane of symmetry, the housing has a feature point that is in contact with the abutment portion or closest to the abutment portion, the feature point is projected onto the first plane of symmetry to form a first projection point, the ear hook is projected onto the first plane of symmetry to form a third projection, the third projection includes an inner contour curve, a point on the inner contour curve that is farthest from the first projection point is a second feature point, and the distance between the first projection point and the second feature point is 15 mm to 20 mm.

[0039] In some embodiments, the housing is projected onto the first symmetry plane to form a first projection, a line connecting the first projection point and the second feature point is defined as a first connecting line, a first auxiliary line is drawn through the second feature point on a side biased toward the first projection, an included angle between the first auxiliary line and the first connecting line has a first predetermined value range, an intersection of a curve segment connected to the first projection on the inner contour curve and the first auxiliary line is defined as a fourth feature point, a line connecting the fourth feature point and the second feature point is defined as a second connecting line, and the first predetermined value range is 30° to 41°.

[0040] In some embodiments, a portion of the inner contour curve corresponding to the second connecting line has a first arc length, a ratio of the first arc length to the length of the second connecting line is defined as a first arc length-to-chord length ratio, and the first arc length-to-chord length ratio is between 1.05 and 1.25.

[0041] In some embodiments, a second arc-shaped segment and a third arc-shaped segment are determined on both sides of the fourth feature point, with the fourth feature point as a center, and the arc lengths of the second arc-shaped segment and the third arc-shaped segment are both within a predetermined arc length range. A line connecting one end of the second arc-shaped segment remote from the fourth feature point and one end of the third arc-shaped segment remote from the fourth feature point is defined as a third connecting line. The arc-shaped segment corresponding to the third connecting line has a second arc length, and the predetermined arc length range is 2.5 mm to 3.5 mm. A ratio of the second arc length to the length of the third connecting line is defined as a second arc length-to-chord length ratio, and the second arc length-to-chord length ratio is 1.26 to 1.44.

[0042] In some embodiments, the ear cuff earphone further includes a decompression hole, and a projection of the decompression hole onto the first symmetry plane lies on an arc segment corresponding to the third connecting line.

[0043] The present application will be further illustrated by exemplary embodiments, which are not limiting and will be described in detail with reference to the drawings, in which like numbers refer to like structures. [Brief explanation of the drawings]

[0044] [Figure 1A] 1 is a schematic diagram of an exemplary ear according to some embodiments herein. [Figure 1B] 1 is a schematic view showing how an ear cuff-type earphone is worn according to some embodiments of the present disclosure. FIG. [Figure 2] 1 is an exemplary structural diagram of an ear cuff-type earphone according to some embodiments of the present disclosure. [Figure 3] FIG. 10 is an exemplary structural diagram of an ear cuff-type earphone from another angle according to some embodiments of the present disclosure. [Figure 4A] 1 is a schematic diagram of a projection onto a first plane of symmetry of an ear cuff-type earphone according to some embodiments of the present disclosure; FIG. [Figure 4B]1 is a schematic diagram of a projection onto a first plane of symmetry of an ear cuff-type earphone according to some embodiments of the present disclosure; FIG. [Figure 5] FIG. 2 is an exemplary structural diagram of a sound generating unit according to some embodiments of the present disclosure. [Figure 6] 1 is an exemplary structural diagram of a decompression hole according to some embodiments herein. [Figure 7] 10A-10C illustrate frequency response curves corresponding to rear cavities with decompression holes having different areas, according to certain embodiments herein. [Figure 8] 10A-10C illustrate frequency response curves corresponding to front cavities with different sound outlet areas, according to certain embodiments of the present disclosure. [Figure 9] 1 is an exemplary structural diagram of a housing according to some embodiments herein. [Figure 10A] FIG. 1 is a free-field sound field schematic diagram in accordance with some embodiments herein. [Figure 10B] FIG. 1 is a sound field schematic diagram of a reflected sound field in accordance with some embodiments herein. [Figure 10C] FIG. 1 is a free-field and reflected-field sound pressure level curve diagram according to some embodiments herein. [Figure 11A] FIG. 10 is a schematic diagram of the positional relationship between a sound generating unit and a reflective wall surface according to some embodiments of the present disclosure. [Figure 11B] 10A-10C are diagrams illustrating sound pressure level curves of reflected sound fields corresponding to different distances h, according to some embodiments of the present disclosure. [Figure 11C] 10A-10C are diagrams illustrating sound pressure level curves of reflected sound fields corresponding to different included angles θ, according to some embodiments herein. [Figure 12] 10A-10C are diagrams illustrating sound pressure level curves of reflected sound fields corresponding to different distances h, according to some embodiments of the present disclosure. [Figure 13] 4A-4C are diagrams illustrating sound pressure level curves corresponding to the same frequency, the same distance h, and different included angles θ according to some embodiments of the present disclosure. [Figure 14]FIG. 10 is an exemplary structural diagram of another ear cuff-type earphone according to some embodiments of the present disclosure. [Figure 15] FIG. 2 is an exemplary structural diagram of a sound generating unit according to some embodiments of the present disclosure. [Figure 16] 1A and 1B are schematic diagrams illustrating the installation positions and mounting states of sound emission holes according to some embodiments of the present specification. [Figure 17] 10A-10C are schematic diagrams of mounting positions at different angles β, according to some embodiments herein. [Figure 18] 10A-10C are frequency response curve diagrams at the ear canal corresponding to different β angles when α is 0, according to some embodiments of the present disclosure. [Figure 19] 10A and 10B are frequency response curve diagrams at the ear canal corresponding to different α angles when β is 0, according to some embodiments herein. DETAILED DESCRIPTION OF THE INVENTION

[0045] In order to more clearly describe the technical means of the embodiments of the present application, the drawings necessary for describing the embodiments will be briefly described below. Obviously, the drawings described below are only examples or parts of the embodiments of the present application, and those skilled in the art can apply the present application to other similar scenarios based on these drawings without any creative effort. Unless otherwise clear from the context or described otherwise, the same symbols in the drawings represent the same structures or operations.

[0046] It should be understood that the terms "system," "device," "unit," and / or "module" used herein are ways of distinguishing between various assemblies, elements, components, parts, or structures at different levels, however, other terms may be used in place of the above terms if they achieve the same purpose.

[0047] As used herein and in the claims, unless the context clearly dictates otherwise, terms such as "a," "one," "one kind," and / or "the" do not specifically refer to the singular but may include the plural. In general, the terms "comprise" and "containing" merely indicate the inclusion of explicitly identified steps and elements, and these steps and elements are not an exclusive listing; a method or apparatus may also include other steps or elements.

[0048] It should be noted that in the description herein, the terms "first," "second," "third," "fourth," etc. are used for descriptive purposes only and should not be understood to denote or suggest relative importance or to implicitly denote the quantity of the depicted technical features. Therefore, a feature qualified by "first," "second," "third," or "fourth" can explicitly or implicitly denote the inclusion of at least one of the feature. In the description herein, unless otherwise clearly and specifically limited, "plurality" means at least two, e.g., two, three, etc.

[0049] In this specification, unless otherwise clearly specified or limited, the terms "connected," "fixed," etc. should be understood in a broad sense. For example, unless otherwise clearly limited, the term "connected" may mean a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in this specification according to specific circumstances.

[0050] FIG. 1A is a schematic diagram of an exemplary ear unit according to some embodiments of the present disclosure. As shown in FIG. 1A , the ear unit 100 (also referred to as the pinna) may include an external auditory canal 101, a cavity of the concha 102, a concha navicularis 103, a triangular fossa 104, an antihelix 105, a scapha 106, a helix 107, an earlobe 108, a tragus 109, and a crus of the helix 1071. In some embodiments, an acoustic device can be stably worn by being supported by one or more parts of the ear unit 100. In some embodiments, parts such as the external auditory canal 101, the cavity of the concha 102, the concha navicularis 103, and the triangular fossa 104 have a certain depth and volume in three-dimensional space, which can meet the wearing needs of the acoustic device. For example, an acoustic device (e.g., an in-ear earphone) may be worn in the external auditory canal 101. In some embodiments, the acoustic device can be worn in parts of the ear unit 100 other than the external auditory canal 101. For example, the acoustic device can be attached to the concha scapha 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, the helix 107, or a combination thereof. In some embodiments, to improve comfort and reliability when wearing the acoustic device, it can be attached to the user's earlobe 108 or other locations. By attaching the acoustic device and transmitting sound through a location other than the ear canal 101 of the ear unit 100, the user's ear canal 101 can be "opened." When a user wears the acoustic device, the acoustic device does not block the user's ear canal 101 (or ear canal or ear canal opening), allowing the user to receive not only sound from the acoustic device but also sound from the environment (e.g., horns, bicycle bells, voices of people around, traffic control, etc.), thereby reducing the likelihood of traffic accidents. In some embodiments, the acoustic device can be designed to fit the ear unit 100 based on its structure, allowing the sound-generating portion of the acoustic device to be attached to different locations on the ear unit 100.For example, if the acoustic device is an ear cuff-type earphone, the ear cuff-type earphone may include a sound-generating unit, a contact unit, and an ear hook, and the ear hook has an arc-shaped structure and can connect the sound-generating unit and the contact unit by bypassing the wearer's antihelix 105 and helix 107 so that the sound-generating unit is located in the wearer's concha cavity 102 and contacts the wall of the concha cavity 102, and the contact unit contacts the back of the wearer's ear.

[0051] Because there may be individual differences among different users, ears vary in shape, size, and the like. For ease of explanation and understanding, unless otherwise specified, this specification primarily uses an ear model having a "standard" shape and dimensions as a reference to further describe the wearing method of an acoustic device on the ear model in different embodiments. For example, a simulator including a head and its (left and right) ears manufactured in accordance with ANSI: S3.36, S3.25, and IEC: 60318-7 standards, such as the GRAS 45BC KEMAR, can be used as a reference for wearing an acoustic device and represents a scenario in which most users normally wear an acoustic device. By way of example only, the reference ear may have the relevant characteristics that the vertical axis dimension of the projection of the auricle onto the sagittal plane is within the range of 49.5 mm to 74.3 mm, and the sagittal axis dimension of the projection of the auricle onto the sagittal plane is within the range of 36.6 mm to 55 mm. Therefore, in this application, the terms "worn by a wearer," "in a wearing state," and "in a wearing state" may refer to the acoustic device described herein being worn in the ear section of the simulator. Naturally, taking into account individual differences among different users, the structure, shape, size, thickness, etc. of one or more parts of the ear section 100 may have certain differences. To meet the needs of different users, the acoustic device may be designed differently. These differentiated designs may be adapted to different ear sections by having different ranges of value for characteristic parameters of one or more structures of the acoustic device (e.g., the sound generating section, ear hook, etc.)

[0052] In fields such as medicine and anatomy, three basic cutting planes of the human body, the sagittal plane, the coronal plane, and the horizontal plane, and three basic axes, the sagittal axis, the coronal axis, and the vertical axis, can be defined. The sagittal plane is a cutting plane perpendicular to the ground along the front-to-back direction of the body (e.g., from the front of the chest to the back), dividing the human body into two parts, left and right. The coronal plane is a cutting plane perpendicular to the ground along the left-to-right direction of the body (e.g., from the left shoulder to the right shoulder), dividing the human body into two parts, left and right. The horizontal plane is a cutting plane parallel to the ground along the up-down direction perpendicular to the body (e.g., from the top of the head to the soles of the feet), dividing the human body into two parts, left and right. Accordingly, the sagittal axis refers to the axis that is perpendicular to the coronal plane along the anterior-posterior direction of the body, the coronal axis refers to the axis that is perpendicular to the sagittal plane along the lateral direction of the body, and the vertical axis refers to the axis that is perpendicular to the horizontal plane along the superior-inferior direction of the body. Observing the ear of the simulator along the coronal axis of the human body yields a schematic diagram of the anterior contour of the ear, as shown in Figure 1A.

[0053] FIG. 1B is a schematic diagram illustrating how to wear an ear cuff earphone according to some embodiments of the present disclosure. In some embodiments, the ear cuff earphone may include, but is not limited to, an air conduction earphone, a bone conduction earphone, or an earphone that combines air conduction and bone conduction. As shown in FIG. 1B, the ear cuff earphone 100-1 may include a sound generating unit 100-11, a contact unit 100-12, and an ear hook 100-13 connecting the sound generating unit 100-11 and the contact unit 100-12. The ear cuff earphone 100-1 may be held by the wearer's ear 100 through engagement between the ear hook 100-13, the sound generating unit 100-11, and the contact unit 100-12.

[0054] In some embodiments, when the ear cuff earphone 100-1 is worn, the sound generating unit 100-11 is located in the wearer's concha cavity (e.g., concha cavity 102) and is in close contact with the wall of the concha cavity. The contacting unit 100-12 is in contact with the back of the wearer's ear, for example, the back surface of the concha cavity. Both ends of the ear hook 100-13 are connected to the contacting unit 100-12 and the sound generating unit 100-11, respectively. The intermediate regions of the ear hook 100-13 form extensions with a certain arc, allowing the ear hook 100-13 to bypass the wearer's antihelix (e.g., antihelix 105) and helix (e.g., helix 107) when worn. The ear hook 100-13 may have elasticity, which means that when the sound-generating unit 100-11 is separated from the contact portion 100-12, the ear hook 100-13 can provide an elastic force that urges the sound-generating unit 100-11 to approach the contact portion 100-12. When worn, the elastic force of the ear hook 100-13 is converted into a clamping force that clamps the sound-generating unit 100-11 and the contact portion 100-12 on both sides of the concha cavity, ensuring stability of the ear hook.

[0055] In some embodiments, to fit the shape of the concha, the housing of the sound-generating unit 100-11 must have an outer shape that is close to the shape of the concha, such as a sphere, near-spherical, or spindle-shaped, so that the sound-generating unit 100-11 can make sufficient contact with the wall of the concha and engage with the abutment portions 100-12 to be fastened to both sides of the concha. Because of the spatial dimensions of the concha, the volume of the housing of the sound-generating unit 100-11 is small, which limits the size of the sound-generating assembly located inside the housing and reduces the sound-generating efficiency of the sound-generating unit 100-11.

[0056] Based on this, an embodiment of the present specification provides an ear cuff-type earphone including a sound generating unit, a contact unit, and an ear hook connecting the sound generating unit and the contact unit. A sound output hole is provided in the housing of the sound generating unit. When worn, a portion of the sound output hole is blocked by the wall of the concha cavity, and the unblocked portion of the sound output hole faces the ear canal of the wearer. By arranging the sound output hole so that a portion of the sound output hole is blocked by the wall of the concha cavity, near the sound transmission direction, the wall of the concha cavity forms a reflective wall surface in the sound transmission direction. The reflective wall surface reflects sound, and the sound field of the sound guided through the sound output hole can form a reflective sound field. In the reflective sound field, the reflected sound wave and the sound source sound wave (i.e., the initial sound wave guided from the sound output hole) interfere with each other and diffract to form a sound reinforcement area, thereby increasing the volume of the sound guided to the ear canal of the wearer.

[0057] FIG. 2 is an exemplary structural diagram of an ear cuff earphone according to some embodiments of the present disclosure. FIG. 3 is an exemplary structural diagram of an ear cuff earphone according to some embodiments of the present disclosure from another angle. FIG. 2 is a front view of the ear cuff earphone when placed vertically on a horizontal surface (e.g., on a desk), and FIG. 3 is a front view of the ear cuff earphone when placed horizontally on a horizontal surface (e.g., on a desk). As shown in FIGS. 2 and 3 , in some embodiments, the ear cuff earphone 200 may include an audio generating unit 210, an abutting unit 220, and an ear hook 230 connecting the audio generating unit 210 and the abutting unit 220. The ear hook 230 has an overall arc-shaped structure. In combination with the above, when the ear cuff earphone 200 is worn, the ear hook 230 can bypass the wearer's antihelix (e.g., antihelix 105) and helix (e.g., helix 107), so that the sound generating unit 210 is located in the wearer's concha cavity (e.g., concha cavity 102) and contacts the wall of the concha cavity, and the contact unit 220 contacts the back of the wearer's ear. The sound generating unit 210 and the contact unit 220 clamp the ear unit in a clamping manner, so that the ear cuff earphone 200 is clamped and worn by the wearer's helix, and the ear cuff earphone 200 is worn stably.

[0058] The sound generating unit 210 is a sound reproducing device. The sound generating unit 210 converts an electrical signal into a sound signal and reproduces the sound signal to the wearer. For example, the sound signal generated by the sound generating unit 210 may be transmitted to the ear canal of the wearer via the sound output hole 213 of the sound generating unit 210.

[0059] In some embodiments, as shown in FIG. 3 , the sound-generating unit 210 may include a housing 211, a sound-generating assembly (e.g., sound-generating assembly 212 in FIG. 5 ), and a sound emission hole 213. The housing 211 may be a hollow frame. The ear hook 230 is connected to the housing 211. The housing 211 can form an accommodating cavity that accommodates other assemblies (e.g., the sound-generating assembly) of the sound-generating unit 210. In some embodiments, the housing 211 may include a first hard housing (e.g., first hard housing 2111 in FIG. 9 ) and a second hard housing (e.g., second hard housing 2112 in FIG. 9 ), which surround the first hard housing and the second hard housing to form the accommodating cavity. One of the two hard housings (e.g., the second hard housing) faces the wearer's concha cavity and contacts the wall of the concha cavity. The other hard housing is connected to the ear hook 230. In some embodiments, the rigid housing may be made of plastic, metal, or a support material that can be used for earphone housings to provide greater support and stability to the internal structure of the housing 211 (e.g., the sound-generating assembly). In some embodiments, the housing 211 may further include a flexible housing (e.g., the first flexible portion 2113 in FIG. 9). Of the two rigid housings, the outer surface of one rigid housing (e.g., the second rigid housing) that contacts the wall of the wearer's concha may be covered with a flexible housing, which can improve the comfort of wearing the ear cuff earphone 200 and the fit of the ear cuff earphone 200 with the user's ear (e.g., the concha). For more information regarding the housing 211, please refer to other portions of this specification, such as FIG. 9 and its related description.

[0060] The sound-generating assembly is a module capable of converting an electrical signal into an audio signal. The sound-generating assembly is located within a receiving cavity formed by the housing 211. In some embodiments, the sound-generating assembly may include an audio driver (also called a speaker). The audio driver can convert an electrical signal into an audio signal and output it. Exemplarily, the audio driver may include a diaphragm, a coil that can vibrate the diaphragm, and a magnetic circuit assembly (e.g., a magnet, a magnetic flux conductive cover). The diaphragm may divide the cavity structure of the sound-generating unit 210 into a front cavity and a rear cavity. The audio driver has a front side and a rear side. The front side of the audio driver may be the side of the diaphragm facing away from the magnetic circuit assembly, and the rear side of the audio driver may be the side of the diaphragm facing the magnetic circuit assembly or the side of the magnetic circuit assembly facing away from the diaphragm. When vibrating, sound is generated on the side of the diaphragm facing away from the magnetic circuit assembly and on the side facing the magnetic circuit assembly, respectively. The sound generated on the side of the diaphragm facing away from the magnetic circuit assembly is radiated to the outside through the front cavity, and the sound generated on the side of the diaphragm facing the magnetic circuit assembly is radiated to the outside through the rear cavity. In some embodiments, the sound generating assembly may include two audio drivers. The two audio drivers are installed opposite each other (i.e., the diaphragms of the two audio drivers are installed opposite each other), and an audio transmission path (also referred to as a first audio transmission path) is formed between the diaphragms of the two audio drivers. The first audio transmission path is acoustically connected to the sound emission hole 213 and forms the front cavity or part of the front cavity of the two audio drivers (it may also be understood that the two audio drivers share the front cavity). In some embodiments, each audio driver may include a magnet and a magnetic flux conductive cover spaced apart from the corresponding diaphragm, and a supporting frame.Another sound transmission passage (also called a second sound transmission passage) may be formed between the two frames, and the rear surfaces of the two diaphragms are in acoustic communication with the second sound transmission passage through vents on the frames, and the second sound transmission passage forms the rear cavity or a part of the rear cavity of the two sound drivers (it may be understood that the two sound drivers share the rear cavity). For more information regarding the sound generation assembly, please refer to other parts of this specification, for example, Figure 5 and its related description.

[0061] As shown in FIG. 3 , sound emitting holes 213 are located in housing 211, and sound emitting holes 213 can guide sound generated by the sound generating assembly. In some embodiments, the shape of the outer end surface of sound emitting holes 213 may be a strip-like structure (e.g., elongated). In some embodiments, sound emitting holes 213 may be located in the center of housing 211. In this case, the outer end surface of sound emitting holes 213 is symmetrical with respect to a plane bisecting the bottom surface of housing 211. The bottom surface of housing 211 refers to the surface opposite the end surface of housing 211 connected to ear hook 230. When worn, the bottom surface of housing 211 faces the wearer's ear canal (e.g., ear canal 101). The bisecting plane of the bottom surface refers to a plane parallel to the extension direction of ear hook 230 (or may be a plane parallel to or overlapping with first plane of symmetry 300 of ear hook 230, which will be described later), and this plane divides the bottom surface of housing 211 into two symmetrical (or approximately symmetrical) parts. In some embodiments, the sound emitting hole 213 may be disposed offset from the housing 211. In this case, the outer end surface of the sound emitting hole 213 is asymmetric with respect to the bisecting plane of the bottom surface of the housing 211. For example, the sound emitting hole 213 is located on one side of a symmetry plane of the ear hook 230 (e.g., a first symmetry plane 300 described below). In some embodiments, the sound emitting hole 213 may face the opening of the wearer's ear canal, and the sound emitting hole 213 is not blocked by the wall of the cavity of the concha. The sound field of the sound guided from the sound emitting hole 213 is a free sound field, and since the volume of the sound in the free sound field is low, the volume transmitted to the opening of the wearer's ear canal is low. In order to increase the volume of sound guided from the sound emitting hole 213 and transmitted to the ear canal, in some embodiments, the position of the sound generating unit 210 in the cavity of the concha and the position of the sound emitting hole 213 on the housing 211 can be designed so that a portion of the sound emitting hole 213 is shielded by the wall of the cavity of the concha, and the unshielded portion of the sound emitting hole 213 faces the ear canal of the wearer. By positioning the sound emitting hole 213 so that a portion of the sound emitting hole 213 is shielded by the wall of the cavity of the concha, the sound field of the sound guided from the sound emitting hole 213 can form a reflected sound field, thereby increasing the volume of sound transmitted to the ear canal.Specifically, when a portion of the sound output hole 213 is blocked by the wall of the concha cavity, the wall of the concha cavity forms a reflective wall surface in the sound transmission direction near the sound transmission direction. The reflective wall surface reflects sound, and the reflected sound waves and the source sound waves (i.e., the initial sound waves emitted from the sound output hole 213) interfere with each other and diffract to form a sound-enhanced area, thereby increasing the volume of the sound. In some embodiments, by setting parameters such as the sound output hole 213 and / or the housing 211, a portion of the sound output hole 213 can be blocked by the wall of the concha cavity, thereby enhancing the reflection. Furthermore, by leaving a portion of the sound output hole 213 unblocked and directing the unblocked area of ​​the sound output hole 213 toward the ear canal, sound can be accurately transmitted to the wearer's ear canal in real time, thereby improving the listening experience and increasing the listening volume. For more information on the free sound field and the reflected sound field, please refer to Figures 10A to 13 and their related descriptions. For more information regarding the setting of parameters such as the sound emission holes 213 and / or the housing 211, please refer to other parts of this specification, for example, FIG. 4A and its associated description.

[0062] The abutting portion 220 abuts against the back of the wearer's ear and engages with the sound generating unit 210 to clamp the ear portion in a clamping manner. In some embodiments, the abutting portion 220 may have an abutting housing, and the abutting portion 220 is connected to the ear hook 230 via the abutting housing. The abutting housing may form an accommodation space. In some embodiments, the accommodation space formed by the abutting housing may be used as a battery compartment for accommodating a battery and / or other assemblies (e.g., a circuit board). In some embodiments, the battery may supply electrical energy to the ear cuff earphone 200. For example, the battery may be electrically connected to the sound generating assembly of the sound generating unit 210 so as to supply electrical energy for sound generation by the sound generating assembly. In some embodiments, the circuit board may be electrically connected to the sound generating assembly of the sound generating unit 210 (e.g., electrically connected via a lead wire or a flexible circuit board) so as to control sound generation by the sound generating assembly. In some embodiments, both the circuit board and the battery may be installed in the accommodation space formed by the abutting housing. In some embodiments, the circuit board and the battery may be installed in the accommodation space formed by the abutting housing and the accommodation cavity formed by the housing 211 of the sound generating unit 210, respectively, and the circuit board and the battery may be electrically connected to each other via corresponding conductors and further electrically connected to the sound generating assembly of the sound generating unit 210 via conductors.

[0063] In combination with the above, when worn, the ear hook 230 can bypass the wearer's antihelix (e.g., antihelix 105) and helix (e.g., helix 107), so that the sound generating unit 210 is located in the wearer's concha cavity and contacts the wall of the concha cavity, and the abutting unit 220 abuts against the back of the wearer's ear. In some embodiments, the ear hook 230 may be provided with a titanium wire extending along the extension direction of the ear hook 230. Compared to other materials, titanium wire has excellent properties such as high mechanical strength, high toughness, and light weight, thereby ensuring the stability and comfort of wearing the ear cuff type earphone 200. In some embodiments, the ear hook 230 may be provided with a titanium sheet. The titanium sheet has a sheet-like structure and extends along the extension direction of the ear hook 230. The surface of the titanium sheet is perpendicular to the plane of symmetry of the ear hook 230 along its extension direction (i.e., first plane of symmetry 300). The titanium sheet can reduce or prevent twisting of the ear hook 230 during wearing or while wearing the ear cuff earphone 200, thereby further improving the stability and comfort of wearing the ear cuff earphone 200. In some embodiments, the ear hook 230 may include a first connecting portion, an extension portion, and a second connecting portion, which are connected in order. The first connecting portion, the extension portion, and the second connecting portion all have an arc-shaped structure. The first connecting portion refers to a portion of the area where the ear hook 230 and the sound generating unit 210 are connected, the second connecting portion refers to a portion of the area where the ear hook 230 and the abutting portion 220 are connected, and the extension portion refers to the area between the first connecting portion and the second connecting portion. In some embodiments, by setting parameters of the first connecting portion (e.g., arc length, curvature, etc.), it is possible to ensure that the sound generating unit 210 does not abut against the tragus and does not block the wearer's ear canal, thereby improving the comfort and safety of wearing the ear cuff earphone 200. In some embodiments, the curvature of the second connecting portion can be set to be large (i.e., the degree of curvature of the second connecting portion is large), which makes the overall layout of the ear cuff type earphone 200 more compact, reduces the spatial volume occupied by the ear cuff type earphone 200, and improves the convenience of storage or portability.The curvature of the second connecting portion may refer to the curvature of the arc-shaped segment of the inner or outer contour of the projection of the second connecting portion onto the symmetry plane (i.e., the first symmetry plane 300) of the ear hook 230 along its extension direction. In some embodiments, the extension length of the extension portion can be set to be large (e.g., greater than a length threshold), thereby ensuring that the ear cuff earphone 200 can adapt to the dimensions of the ear parts of different people. The extension length refers to the length along the extension direction of the extension portion.

[0064] In some embodiments, the ear hook 230 may have a first plane of symmetry. As shown in FIG. 3 , in some embodiments, the ear hook 230 has a first plane of symmetry 300 along its extension direction. The first plane of symmetry 300 is parallel or nearly parallel to the extension direction of the ear hook 230. The first plane of symmetry 300 divides the ear hook 230 into two symmetrical or nearly symmetrical parts. The extension direction of the ear hook 230 refers to the direction in which one end of the ear hook 230 connected to the abutment unit 220 extends toward the other end of the ear hook 230 connected to the sound generating unit 210.

[0065] In some embodiments, the outer end surface of the sound output hole 213 may have a curved strip-like shape. As described above, the sound output hole 213 may be located in the center of the housing 211 or may be located offset from the housing 211. As shown in FIG. 3 , when the sound output hole 213 is located in the center of the housing 211, the outer end surface of the sound output hole 213 may be symmetrical with respect to the first plane of symmetry 300. When the sound output hole 213 is located offset from the housing 211, the outer end surface of the sound output hole 213 is asymmetric with respect to the first plane of symmetry 300. As can be understood, the housing 211 of the sound generating unit 210 has a certain thickness, and the sound output hole 213 is formed in the housing 211 to guide sound output from the sound generating assembly to the outside of the ear cuff type earphone 200, so the sound output hole 213 also has a certain depth. Based on this, the outer end surface of the sound output hole 213 may refer to the end surface of the sound output hole 213 located on the outer wall surface of the housing 211.

[0066] In some embodiments, the projection of the outer end surface of the sound emitting hole 213 onto the first plane of symmetry 300 may form an arc-shaped segment, and the projection of the housing 211 onto the first plane of symmetry 300 has an arc-shaped outer contour, with at least a portion of the arc-shaped outer contour overlapping the arc-shaped segment. For ease of explanation, hereinafter, the arc-shaped segment formed by the projection of the outer end surface of the sound emitting hole 213 onto the first plane of symmetry 300 will be simply referred to as the arc-shaped segment of the sound emitting hole 213, and the arc-shaped outer contour of the projection of the housing 211 onto the first plane of symmetry 300 will be simply referred to as the arc-shaped outer contour of the housing 211. In some embodiments, the sound generating unit 210 (or the housing 211) may be approximately spherical as a whole, and the projection of the housing 211 onto the first plane of symmetry 300 may have an arc-shaped outer contour. Since the sound emitting hole 213 is formed in the housing 211 of the sound generating unit 210, the outer end surface of the sound emitting hole 213 has an arc-shaped structure. Based on this, it can be seen that the projection of the outer end surface of the sound emitting hole 213 onto the first plane of symmetry 300 can form an arc-shaped segment. Furthermore, when the outer end surface of the sound emitting hole 213 is symmetrical with respect to the first plane of symmetry 300, the arc-shaped segment of the sound emitting hole 213 overlaps with at least a portion of the arc-shaped outer contour of the housing 211.

[0067] By positioning the housing 211 so that at least a portion of the arcuate outer contour overlaps with the arcuate segment of the sound emitting hole 213, it is possible to ensure that the outer end surface of the sound emitting hole 213 is symmetrical with respect to the first plane of symmetry 300, thereby ensuring that a portion of the sound emitting hole 213 can be shielded by the wall of the concha cavity when worn, and the sound field of the sound guided from the sound emitting hole 213 becomes a reflected sound field, which enhances reflection and increases the volume heard by the wearer.

[0068] 4A is a schematic diagram of a projection onto a first symmetry plane of an ear cuff type earphone according to some embodiments of the present disclosure. In some embodiments, the housing 211 has a feature point that is in contact with or closest to the abutting portion 220. In some embodiments, when the ear cuff type earphone 200 is in a natural state (i.e., an unworn state), the housing 211 of the sound generating unit 210 may be in contact with the abutting portion 220. If the contact between the housing 211 and the abutting portion 220 is point contact, the feature point is the point on the housing 211 that contacts the abutting portion 220. Point contact may refer to a point where the contact with the abutting portion 220 on the housing 211 is made, or may refer to a contact area where the contact with the abutting portion 220 on the housing 211 is small and can be considered to be approximately a point. If the contact between the housing 211 and the abutting portion 220 is surface contact, the feature point is the centroid of the contact surface that contacts the abutting portion 220 on the housing 211. In some embodiments, when the ear cuff type earphone 200 is in a natural state, the housing 211 of the sound generating unit 210 and the abutting portion 220 may not be in contact with each other, and a certain distance may exist between them. In this case, the point on the housing 211 closest to the abutting portion 220 is the feature point. The point on the housing 211 closest to the abutting portion 220 refers to the end point located on the housing 211 of the shortest line connecting the housing 211 and the abutting portion 220. In some embodiments, as shown in FIG. 4A , the feature point on the housing 211 is projected onto the first plane of symmetry 300 to form a first projection point A.

[0069] 4A , the projection of the sound emission hole 213 onto the first symmetry plane 300 forms an arc-shaped segment, which may correspond to the arc BC formed by points B and C in FIG. 4A . The arc-shaped segment includes two end points, a first end point B and a second end point C. The first end point B is the end point closer to the first projection point A of the two end points of the arc-shaped segment. The second end point C is the end point farther from the first projection point A of the two end points of the arc-shaped segment.

[0070] The characteristic point on the housing 211 is located in the area closest to the abutment portion 220 of the housing 211, and when the ear cuff type earphone 200 is in a worn state, the housing 211 and the abutment portion 220 sandwich the characteristic point on the housing 211 inside and outside the cavity of the concha, so that the characteristic point on the housing 211 is shielded by the cavity of the concha. Based on this, a part of the area of ​​the sound emitting hole 213 close to the characteristic point of the housing 211 may be shielded by the wall of the cavity of the concha, and a part of the area of ​​the sound emitting hole 213 away from the characteristic point of the housing 211 is not shielded by the wall of the cavity of the concha. Corresponding to the projection curve or projection point, the area close to the first projection point A in the arc-shaped segment of the sound emitting hole 213 is shielded by the wall of the cavity of the concha, and the area away from the first projection point A in the arc-shaped segment is not shielded. This means that when a portion of the sound emitting hole 213 can be shielded by the wall of the cavity of the concha, the portion of the area that is initially shielded is the first end point B of the arc-shaped segment and a portion of the area close to the first end point B, and the portion of the sound emitting hole 213 that is not shielded is the second end point C of the arc-shaped segment and a portion of the area close to the second end point C. The second end point C is closer to the ear canal than the first end point B. Therefore, the distance (e.g., arc length) between the first end point B and / or the second end point C of the arc-shaped segment and the first projection point A can affect the position of the sound emitting hole 213 relative to the cavity of the concha when worn, and thereby affect whether the wall of the cavity of the concha shields or does not shield the portion of the sound emitting hole 213.

[0071] In some embodiments, the arc length between the first end point B of the arc-shaped segment and the first projection point A is in the range of 1.7 mm to 4.5 mm to ensure that a portion of the sound emitting hole 213 can be shielded by the wall of the cavity of the concha. In some embodiments, the arc length between the first end point B of the arc-shaped segment and the first projection point A is in the range of 2 mm to 4 mm to ensure that a portion of the sound emitting hole 213 can be shielded by the wall of the cavity of the concha.

[0072] In some embodiments, the arc length between the second end point C of the arc-shaped segment and the first projection point A is in the range of 12 mm to 15.5 mm to ensure that a portion of the sound emitting hole 213 is not blocked by the wall of the cavity of the concha. In some embodiments, the arc length between the second end point C of the arc-shaped segment and the first projection point A is in the range of 13 mm to 15 mm to ensure that a portion of the sound emitting hole 213 is not blocked by the wall of the cavity of the concha.

[0073] As can be understood, the arc-shaped segment of sound emission hole 213 overlaps with at least a portion of the arc-shaped outer contour of housing 211, and therefore the first end point B and second end point C of the arc-shaped segment are both on the arc-shaped outer contour of housing 211. Because the characteristic point is a "point" on the outer wall surface of housing 211, the first projection point A of the characteristic point also lies on the arc-shaped outer contour of housing 211. Therefore, the arc between first end point B / second end point C and first projection point A is an arc of a portion of the arc-shaped outer contour of housing 211.

[0074] In some embodiments, the housing 211 is projected onto the first plane of symmetry 300 to form a first projection 211', and the abutment portion 220 is projected onto the first plane of symmetry 300 to form a second projection 220'. The first projection 211' and the second projection 220' have a common tangent L. The common tangent L is a tangent that touches both the lower end point of the first projection 211' and the lower end point of the second projection 220'. When the ear cuff type earphone 200 is placed upright on a horizontal surface (for example, on a desk), the sound generating unit 210 and the abutment portion 220 face the horizontal surface and come into contact with it, while the ear hook 230 does not come into contact with the horizontal surface, so the ear cuff type earphone 200 can be placed stably without falling over. Based on this, the bottom end point of the first projection 211' refers to the projection point formed by projecting the intersection point between the sound generating unit 210 and the horizontal plane (or the centroid of the contact surface between the sound generating unit 210 and the horizontal plane) onto the first plane of symmetry 300 when the ear cuff type earphone 200 is placed perpendicular to a horizontal plane. The bottom end point of the second projection 220' refers to the projection point formed by projecting the intersection point between the contact part 220 and the horizontal plane (or the centroid of the contact surface between the contact part 220 and the horizontal plane) onto the first plane of symmetry 300 when the ear cuff type earphone 200 is placed perpendicular to a horizontal plane.

[0075] In some embodiments, the common tangent line L contacts the first projection 211′ at the lower end point of the first projection 211′, and the contact point is referred to as a first contact point D. When the ear cuff type earphone 200 is in a worn state, the first contact point D corresponds to a position approximately facing the ear canal opening. In some embodiments, the first contact point D between the common tangent line L and the first projection 211′ may be on an arc-shaped segment of the sound emitting hole 213 (as shown in FIG. 4A , the first contact point D is on an arc BC). In combination with the above, when a portion of the sound emitting hole 213 can be shielded by the inner wall of the cavity of the concha, the portion of the area that is initially shielded is the first end point B of the arc-shaped segment and a portion of the area close to the first end point B, and the unshielded area of ​​the sound emitting hole 213 is the second end point C of the arc-shaped segment and a portion of the area close to the second end point C. Therefore, most of the area between the first contact point D and the first end point B in the arc-shaped segment of the sound emitting hole 213 can be blocked by the wall of the concha cavity, and the area between the first contact point D and the second end point C in the arc-shaped segment of the sound emitting hole 213 is hardly blocked by the wall of the concha cavity.

[0076] Because most of the area between the first contact point D and the first endpoint B on the arc-shaped segment of the sound emitting hole 213 can be blocked by the wall of the concha cavity, and the area between the first contact point D and the second endpoint C on the arc-shaped segment of the sound emitting hole 213 is hardly blocked by the wall of the concha cavity, the position of the first contact point D on the arc-shaped segment can affect the size of the area of ​​the sound emitting hole 213 that is blocked or not blocked by the wall of the concha cavity. For example, when the first contact point D is closer to the first endpoint B, the blocked area of ​​the sound emitting hole 213 is small and the unblocked area is large, and when the first contact point D is closer to the second endpoint C, the blocked area of ​​the sound emitting hole 213 is large and the unblocked area is small.

[0077] In some embodiments, to ensure that the shielded and / or unshielded areas of the sound output hole 213 have appropriate dimensions and improve the sound reinforcement effect of the reflected sound field, the ratio of the arc length between the first end point B of the arc segment and the first tangent point D to the arc length between the second end point C of the arc segment and the first tangent point D is in the range of 0.5 to 0.85. In some embodiments, to ensure that the shielded and / or unshielded areas of the sound output hole 213 have appropriate dimensions, the ratio of the arc length between the first end point B of the arc segment and the first tangent point D to the arc length between the second end point C of the arc segment and the first tangent point D is in the range of 0.6 to 0.75.

[0078] In some embodiments, the normal to the first tangent point D and the normal to the first endpoint B or the normal to the second endpoint C of the arc segment intersect at a center point O. In some embodiments, when the first tangent point D, the first endpoint B, and the second endpoint C are on the same circumference, the normal to the first tangent point D, the normal to the first endpoint B, and the normal to the second endpoint C intersect at one point, which is the center point O. In some embodiments, when the first tangent point D, the first endpoint B, and the second endpoint C are not on the same circumference, the center point may be the intersection point of the normal to the first tangent point D and the normal to the first endpoint B, or the center point may be the intersection point of the normal to the first tangent point D and the normal to the second endpoint C.

[0079] In some examples, the line connecting the first endpoint B and the center point O and the line connecting the first tangent point D and the center point O form a first included angle (e.g., ∠BOD), and the line connecting the second endpoint C and the center point O and the line connecting the first tangent point D and the center point O form a second included angle (e.g., ∠COD). The magnitude of the first included angle can reflect the magnitude of the arc length between the first tangent point D and the first endpoint B of the arc-shaped segment. Specifically, a larger first included angle indicates a longer arc length between the first tangent point D and the first endpoint B of the arc-shaped segment, and a smaller first included angle indicates a shorter arc length between the first tangent point D and the first endpoint B of the arc-shaped segment. Similarly, the magnitude of the second included angle can reflect the magnitude of the arc length between the first tangent point D and the second endpoint C of the arc-shaped segment. Specifically, a larger second included angle indicates a longer arc length between the first tangent point D and the second endpoint C of the arc-shaped segment, and a smaller second included angle indicates a shorter arc length between the first tangent point D and the second endpoint C of the arc-shaped segment. The ratio between the first included angle and the second included angle can reflect the position of the first tangent point D on the arc-shaped segment. For example, a larger ratio between the first included angle and the second included angle indicates that the first tangent point D is closer to the second endpoint C of the arc-shaped segment, which indicates a larger blocked area of ​​the sound emitting hole 213. A smaller ratio between the first included angle and the second included angle indicates that the first tangent point D is closer to the first endpoint B of the arc-shaped segment, which indicates a smaller blocked area of ​​the sound emitting hole 213.

[0080] In some embodiments, the ratio of the first included angle to the second included angle may be in the range of 0.2 to 1.3 to ensure that the shielded and / or unshielded areas of the sound output hole 213 have appropriate dimensions and improve the sound reinforcement effect of the reflected sound field. In some embodiments, the ratio of the first included angle to the second included angle is in the range of 0.5 to 1.0 to ensure that the shielded and / or unshielded areas of the sound output hole 213 have appropriate dimensions.

[0081] In some embodiments, the first included angle may be in the range of 15° to 55° to ensure an appropriate arc length between the first tangent point D and the first endpoint B of the arc segment. In some embodiments, the first included angle may be in the range of 25° to 45° to ensure an appropriate arc length between the first tangent point D and the first endpoint B of the arc segment.

[0082] In some embodiments, the second included angle is in the range of 40° to 80° to ensure an appropriate arc length between the first tangent point D and the second endpoint C of the arc-shaped segment. In some embodiments, the second included angle is in the range of 50° to 70° to ensure an appropriate arc length between the first tangent point D and the second endpoint C of the arc-shaped segment.

[0083] In some embodiments, the arc length of the arc-shaped segment of the sound emission hole 213 (i.e., the arc length of the arc BC) can affect whether some areas of the sound emission hole 213 are shielded or unshielded by the wall of the cavity of the concha, and the size of the shielded or unshielded areas.

[0084] In some embodiments, if the arc length of the arc-shaped segment is too small, the shielded area of ​​the sound emitting hole 213 may be too small, and thus the sound emitting hole 213 may not be shielded. For example, if the arc length of the arc-shaped segment is too small and the arc length between the first endpoint B of the arc-shaped segment and the first projection point A is large, the first contact point D may be too close to the first endpoint B (i.e., the arc length between the first contact point D and the first endpoint B may be too small), and as a result, the shielded area of ​​the sound emitting hole 213 may be too small, and further, the first contact point D may not be located on the arc-shaped segment (e.g., the first contact point D may be located between the first endpoint B and the first projection point A), and as a result, the sound emitting hole 213 may not be shielded.

[0085] In some embodiments, if the arc length of the arc-shaped segment is too small, the unobstructed area of ​​the sound emitting hole 213 may be too small, resulting in complete obstruction. For example, if the arc length of the arc-shaped segment is too small and the arc length between the second endpoint C of the arc-shaped segment and the first projection point A is small, the first contact point D may be too close to the second endpoint C (i.e., the arc length between the first contact point D and the second endpoint C may be too small), resulting in the unobstructed area of ​​the sound emitting hole 213 being too small, and therefore the first contact point D may not be located on the arc-shaped segment (e.g., the first contact point D may be located on the side of the second endpoint C away from the first projection point A), resulting in the sound emitting hole 213 being completely obstructed.

[0086] In some embodiments, if the arc length of the arc-shaped segment is too long, the area of ​​the outer wall surface of the housing 211 occupied by the outer end surface of the sound emitting hole 213 will be large, which may affect the arrangement of other structures on the housing 211. For example, a decompression hole (e.g., decompression hole 214) may be further installed in the housing 211, and the decompression hole may be spaced apart from the sound emitting hole 213 to ensure the acoustic performance of the ear cuff type earphone 200. If the area occupied by the sound emitting hole 213 is large, this may affect the placement of the decompression hole or reduce the distance between the decompression hole and the sound emitting hole 213. Furthermore, if the arc length of the sound emitting hole 213 is too long, the area of ​​the sound emitting hole 213 will be large, which may affect the resonant frequency range of the front cavity of the ear cuff type earphone 200. For more information regarding the sound emitting hole 213 and the resonant frequency of the front cavity, please refer to other parts of this specification, such as Figures 7 to 8 and their related descriptions.

[0087] In some embodiments, the arc length of the arc-shaped segment of the sound emitting hole 213 may be greater than 5.2 mm to ensure that some areas of the sound emitting hole 213 are shielded by the wall of the cavity of the concha and some areas are not shielded. In some embodiments, the arc length of the arc-shaped segment of the sound emitting hole 213 may be less than 16.7 mm to ensure the acoustic performance of the ear cuff earphone 200 and to facilitate the placement of other structures on the housing 211.

[0088] In some embodiments, the arc length of the arc-shaped segment of the sound emitting hole 213 may be within a range of 5.2 mm to 16.7 mm, so as to ensure the acoustic performance of the ear cuff type earphone 200 while a portion of the sound emitting hole 213 is shielded by the wall of the concha cavity and a portion of the sound emitting hole 213 is not shielded. In some embodiments, the arc length of the arc-shaped segment of the sound emitting hole 213 may be within a range of 7 mm to 15 mm, so as to ensure the acoustic performance of the ear cuff type earphone 200 while a portion of the sound emitting hole 213 is shielded by the wall of the concha cavity and a portion of the sound emitting hole 213 is not shielded. In some embodiments, the width of the sound emitting hole 213 may be within a range of 1.4 mm to 2.2 mm, so as to ensure that the sound emitting hole 213 has an appropriate area range. The width of the sound emitting hole 213 refers to the dimension of the outer end surface of the sound emitting hole 213 in a direction perpendicular to the first plane of symmetry 300. For a more detailed explanation of the area of ​​the sound emission hole 213, please refer to FIGS. 7 and 8 and their related contents.

[0089] In some embodiments, the ratio of the arc length of the arc-shaped segment of the sound output hole 213 to the length of the straight line segment between the first endpoint B and the second endpoint C of the arc-shaped segment (for convenience of explanation, simply referred to as the arc length-to-chord length ratio of the arc-shaped segment) can reflect the curvature of the arc-shaped segment. In some embodiments, the arc length-to-chord length ratio of the arc-shaped segment affects the fit between the sound-generating unit 210 and the concha cavity, thereby affecting whether the wall of the concha cavity can block a portion of the sound output hole 213 and enhance reflection. For example, if the arc length-to-chord length ratio of the arc-shaped segment is too small and the arc length of the arc-shaped segment is too large, it may be difficult for the sound-generating unit 210 to enter the concha cavity and contact the wall of the concha cavity, resulting in failure to enhance reflection. In some embodiments, the arc length-to-chord length ratio of the arc-shaped segment affects the fit between the sound-generating unit 210 and the concha cavity, thereby affecting the stability of the fit of the ear cuff earphone. For example, if the ratio of arc length to chord length of the arc-shaped segment is too large, the ear structure may not be able to properly confine the position of the sound-generating unit 210, which may result in the sound-generating unit 210 moving or rotating when the wearer moves, affecting stability. Based on this, in some embodiments, the ratio of arc length to chord length of the arc-shaped segment may be in the range of 1.05 to 1.4 to improve the fit between the sound-generating unit 210 and the concha cavity, strengthen the reflex, and improve stability when worn.

[0090] The outer end surface of the sound emission hole 213 of the ear cuff type earphone 200 shown in Fig. 2 is symmetrical with respect to the first plane of symmetry 300, that is, the sound emission hole 213 is located in the middle of the housing 211. Unlike the installation manner of the position of the sound emission hole 213 in Fig. 2, in some embodiments, the sound emission hole 213 of the ear cuff type earphone 200 may be located offset from the housing 211, that is, the outer end surface of the sound emission hole 213 is asymmetrical with respect to the first plane of symmetry 300. For example, the sound emission hole 213 is located on one side of the first plane of symmetry 300. When wearing the ear cuff earphone 200, the ear cuff earphone 200 may tilt due to factors such as gravity or unstable wearing. However, by offsetting the sound emission hole 213 to the housing 211, tilting due to factors such as gravity when wearing the ear cuff earphone 200 can be compensated for, and the unobstructed area of ​​the sound emission hole 213 of the ear cuff earphone 200 after tilting can face the ear canal, thereby ensuring the listening effect and listening volume.

[0091] In some embodiments, the sound output hole 213 may have an elongated outer end surface, and the outer end surface has a second plane of symmetry parallel to its longitudinal extension direction. The second plane of symmetry of the sound output hole 213 and the first plane of symmetry 300 of the ear hook 230 may form an included angle. The magnitude of this included angle can affect the orientation of the sound output hole 213 relative to the ear canal opening when the ear cuff earphone 200 is worn. By setting the angle of this included angle, it is possible to ensure that the unobstructed area of ​​the sound output hole 213 faces the ear canal when the ear cuff earphone 200 is tilted. In some embodiments, the ear cuff earphone 200 tilts due to factors such as gravity when worn, and the tilt angle is typically between 0° and 30°. The tilt angle refers to the angle between the first plane of symmetry 300 of the ear hook and the horizontal plane of the human body. In some embodiments, to ensure that the unobstructed area of ​​the sound hole 213 can face the ear canal when the ear cuff earphone 200 is tilted, the included angle between the second symmetry plane of the sound hole 213 and the first symmetry plane 300 of the ear hook 230 may be in the range of 15° to 45°. In some embodiments, as shown in FIG. 2 , ear cuff earphone 200 may further include a decompression hole 214. Decompression hole 214 is located on housing 211 of sound-generating unit 210. As shown in FIG. 2 , decompression hole 214 is located on a side of housing 211 that is close to ear hook 230 and faces the wearer's ear. In some embodiments, decompression hole 214 is in acoustic communication with the rear cavity of the sound-generating assembly and can guide sound within the rear cavity to the outside of housing 211. Decompression hole 214 can balance the pressure in the rear cavity, allowing the diaphragm of the sound-generating assembly to vibrate sufficiently at low frequencies and large amplitudes, resulting in sound with as deep bass and piercing treble as possible.

[0092] In some embodiments, sound generated in front of the audio driver is radiated to the outside through the sound output holes, and sound generated behind the audio driver is radiated to the outside through the decompression holes. Because the sound generated in front of the audio driver and the sound generated behind the audio driver have equal amplitudes and opposite phases, the sound radiated from the sound output holes and the sound radiated from the decompression holes are also roughly equal in amplitude and opposite in phase. When the two sounds reach the ear canal, they cancel out in opposite phase, reducing the volume heard by the wearer. In some embodiments, the decompression holes 214 may be located farther from the ear canal than the sound output holes 213, thereby reducing the anti-phase cancellation at the ear canal between the sound output through the decompression holes 214 and the sound output through the sound output holes 213, thereby increasing the volume heard by the wearer.

[0093] 4A , the projection of the center of the decompression hole 214 onto the first symmetry plane 300 forms a second projection point E. The distance between the second projection point E and the arc-shaped segment of the sound emission hole 213 can reflect the distance between the decompression hole 214 and the sound emission hole 213. The straight-line distance between the second projection point E and the first end point B of the arc-shaped segment is the shortest straight-line distance between the second projection point E and the arc-shaped segment. The shortest straight-line distance between the second projection point E and the arc-shaped segment can be used to measure the distance between the decompression hole 214 and the sound emission hole 213.

[0094] In some embodiments, to ensure that the decompression hole 214 is as far away as possible from the sound emission hole 213, the shortest straight-line distance between the second projection point E of the center of the decompression hole 214 onto the first symmetry plane 300 and the arc-shaped segment is in the range of 8.1 mm to 11 mm. In some embodiments, to ensure that the decompression hole 214 is as far away as possible from the sound emission hole 213, the shortest straight-line distance between the second projection point E of the center of the decompression hole 214 onto the first symmetry plane 300 and the arc-shaped segment is in the range of 8.5 mm to 10.5 mm.

[0095] By setting the range of the shortest straight-line distance between the second projection point E and the arc-shaped segment, the decompression hole 214 is spaced away from the sound output hole 213, thereby reducing the influence of the decompression hole 214 on the sound output from the sound output hole 213, thereby preventing the sound waves emitted from the decompression hole 214 and the sound waves emitted from the sound output hole 213 from canceling out in the near field and affecting the user's listening volume. In addition, by setting the range of the shortest straight-line distance between the second projection point E and the arc-shaped segment, it is possible to ensure that the sound output hole 213 and the decompression hole 214 are separated by the helix when worn, so that the sound output from the decompression hole 214 must bypass the helix to reach the ear canal opening, thereby further reducing the influence of the decompression hole 214 on the sound output from the sound output hole 213 and avoiding audio short-circuiting.

[0096] Note that the sound output holes 213 and the decompression holes 214 are provided in the housing 211, and since each side wall of the housing 211 has a uniform thickness, the sound output holes 213 and the decompression holes 214 are holes with a uniform depth. In this case, the sound output holes 213 and the decompression holes 214 may each have an inner opening and an outer opening. For convenience of explanation, in the examples of this specification, the outer end surface of the sound output hole 213 above and below may refer to the end surface of the outer opening of the sound output hole 213, and the center of the decompression hole 214 above and below may refer to the centroid of the outer opening of the decompression hole 214. For convenience of explanation, in the examples of this specification, the area of ​​the sound output hole 213 below may refer to the area of ​​the outer opening of the sound output hole 213, and the area of ​​the decompression hole 214 may refer to the area of ​​the outer opening of the decompression hole 214. In some other embodiments, the area of ​​the sound emission hole 213 or the decompression hole 214 may refer to other cross-sectional areas of the sound emission hole 213 or the decompression hole 214, such as the area of ​​the inner opening of the sound emission hole 213 or the decompression hole 214, or the average value of the area of ​​the inner opening and the area of ​​the outer opening of the sound emission hole 213 or the decompression hole 214.

[0097] In some embodiments, when the ear cuff earphone 200 is in a worn state, the characteristic point on the housing 211 and the area around it are blocked by the wall of the concha cavity, and if the decompression hole 214 is close to the characteristic point, the decompression hole 214 may also be blocked by the concha cavity, which prevents the sound in the rear cavity of the sound generating assembly from being guided to the outside through the decompression hole 214, further affecting the listening effect of the ear cuff earphone 200. In some embodiments, to ensure that the decompression hole 214 is not blocked by the concha cavity, the arc length between the second projection point E of the center of the decompression hole 214 onto the first symmetry plane 300 and the first projection point A of the characteristic point is 7.5 mm or more.

[0098] In some embodiments, if the decompression hole 214 is far from the feature point, the volume of the housing 211 may become large, making it difficult to carry and store, while the decompression hole 214 may be too close to the connection position between the housing 211 and the ear hook 230, making the structural design at the connection position relatively numerous or complicated and making it difficult to install the decompression hole 214. To ensure that the decompression hole 214 is easily installed on the housing 211 and / or that the volume of the ear cuff earphone 200 is appropriate, the arc length between the second projection point E of the center of the decompression hole 214 onto the first symmetry plane 300 and the first projection point A of the feature point is 9.5 mm or less.

[0099] In some embodiments, in order to achieve both the prevention of the decompression hole 214 being blocked by the cavity of the concha and the ease of installing the decompression hole 214 in the housing 211, the arc length between the second projection point E of the center of the decompression hole 214 onto the first symmetry plane 300 and the first projection point A of the characteristic point is in the range of 7.5 mm to 9.5 mm.

[0100] In some embodiments, the decompression hole 214 may be located on the inside of the ear hook 230 (i.e., on the side facing the ear when worn), and the curvature of the arc-shaped structure around the location of the decompression hole 214 is large, and the arc-shaped structure forms a "concave", which ensures that the decompression hole 214 is not blocked by the ear when worn and further ensures the decompression effect of the decompression hole 214. In some embodiments, a microphone hole may also be located on the side of the ear hook 230 opposite the decompression hole 214, and in this location, when the ear cuff earphone 200 is worn, the microphone hole is located on the side of the ear hook 230 facing the tragus, which improves the sound collection effect of the ear cuff earphone 200, and by locating the decompression hole 214 opposite the microphone hole, it is also possible to reduce mutual interference between the decompression hole 214 and the microphone hole.

[0101] FIG. 4B is a schematic diagram of a projection onto a first plane of symmetry of an ear cuff-type earphone according to some embodiments of the present disclosure. As shown in FIG. 4B , in some embodiments, the ear hook 230 forms a third projection 230′ on the first plane of symmetry 300. In some embodiments, the third projection 230′ includes an inner contour curve and an outer contour curve. The inner contour curve corresponds to the contour of the ear hook 230 on the side closest to the helix when worn, and the outer contour curve corresponds to the contour of the ear hook 230 on the side farther from the helix when worn. In some embodiments, at least one point F is located on the inner contour curve of the third projection 230′, which is farthest from the first projection point A. In some embodiments, if there are multiple points farthest from the first projection point A, the point closest to the second projection 220′ of the abutment portion 220 among these farthest points can be determined as the second feature point F. The second feature point F can be determined by a tool, program, or the like. For example, when the contour curve parameters of the ear cuff earphone 200 (e.g., a simulation curve function of the inner contour of the ear cuff earphone 200, a simulation curve function of the outer contour of the ear cuff earphone 200, etc.) are input, information of the first projection point A can be determined by a corresponding tool, program, etc., and information of the second feature point F (e.g., a position, etc.) can be output.

[0102] In some embodiments, when worn, point A is located near the contact point between the sound generating unit 210 and the cavity of the concha, and the helix is ​​located within the area surrounded by the inner contour of the ear hook 230, and is basically located in the area on the inner contour of the ear hook 230 that is farthest from point A. In order to prevent the ear cuff earphone 200 from pressing and interfering with the tragus when going around the user's tragus, the first projection point A and the second feature point F are designed so that the ear hook 230 of the ear cuff earphone 200 can go around a large proportion of users' ears when worn, making the ear cuff earphone 200 suitable for a wider range of people.

[0103] If the distance between the first projection point A and the second feature point F is too small, the ear hook 230 will press against the helix of many users when worn, affecting wearing comfort and clamping effect. If the distance between the first projection point A and the second feature point F is too large, the overall dimensions of the ear hook 230 will be too large, which will likely cause problems with unstable clamping of the ear cuff earphone 200.

[0104] In some embodiments, to allow the ear hook 230 to bypass a large proportion of the user's ears, and to ensure that the ear hook 230 has appropriate dimensions and avoids unstable clamping issues, the distance between the first projection point A and the second feature point F (i.e., the length of the line segment AF shown in FIG. 4B) may be 15 mm to 20 mm.

[0105] The line connecting the first projection point A and the second feature point F is defined as the first connecting line. A first auxiliary line L4 is drawn through the second feature point F on the side biased toward the first projection 211′, and a first included angle between the first auxiliary line L4 and the first connecting line (i.e., connecting line AF) has a first predetermined value range. The intersection G of the inner contour curve of the third projection 230′ and the first auxiliary line L4 can be defined as the fourth feature point. A line FG connecting the fourth feature point G and the second feature point F is the second connecting line, and the second connecting line (i.e., connecting line FG) is collinear with the first auxiliary line L4. The portion of the ear hook 230 corresponding to the second connecting line FG (e.g., the portion corresponding to the arc-shaped segment FG) is located on the side opposite to the abutment portion 220 of the second connecting line FG, thereby avoiding interference between the ear hook 230 and the antihelix and the helix.

[0106] In some embodiments, if the angle between the second connecting line FG and the first connecting line AF (i.e., ∠AFG) is too small, the inner contour of the portion of the earhook 230 corresponding to the second connecting line FG may interfere with and press against the portion of the user's ear from the helix to the cavity of the concha. If the angle between the second connecting line FG and the first connecting line AF is too large, the dimensions of the earhook 230 may be too large, causing the sound generating unit 210 to interfere with the user's tragus or block the user's ear canal.

[0107] In some embodiments, in order to prevent the sound generating unit 210 from blocking the user's ear canal opening and to prevent the sound generating unit 210 from interfering with the tragus or the antihelix and helix, the first predetermined value range may be 30° to 40°, that is, the first included angle between the second connecting line FG and the first connecting line AF may be 30° to 41°.

[0108] In some embodiments, the inner contour curve portion (i.e., arc FG) of the third projection 230′ corresponding to the second connecting line FG has a first arc length, and the ratio of the first arc length to the length of the second connecting line FG may be defined as a first arc length-to-chord length ratio. The first arc length-to-chord length ratio may reflect the gentleness of the arc FG corresponding to the second connecting line FG. The larger the first arc length-to-chord length ratio, the greater the curvature of the arc FG corresponding to the second connecting line FG, and the larger the area within the arc FG, making it less likely that the corresponding portion of the ear hook 230 will interfere with the portion of the ear from the helix to the cavity of the concha (e.g., the helix, the antihelix). The smaller the first arc length-to-chord length ratio, the gentler the arc FG corresponding to the second connecting line FG, and the smaller the area within the arc FG, making it more likely that the corresponding portion of the ear hook 230 will interfere with the portion of the ear from the helix to the cavity of the concha (e.g., the helix, the antihelix). In some embodiments, the first arc length to chord length ratio may be greater than 1.05 to avoid interference between ear hook 230 and the helix and antihelix.

[0109] If the first arc length to chord length ratio is too large, the dimensions of the ear hook 230 will be too large, and the overall dimensions of the ear cuff earphone 200 will be too large, which may affect the wearing effect and reduce portability. In some embodiments, to ensure that the overall dimensions of the ear cuff earphone 200 are appropriate, the first arc length to chord length ratio may be less than 1.25. In some embodiments, to achieve a balance between the overall dimensions and the wearing effect of the ear cuff earphone 200, the first arc length to chord length ratio is 1.05 to 1.25.

[0110] A second arc-shaped segment (e.g., arc GP1) and a third arc-shaped segment (e.g., arc GP2) are determined on the inner contour curve of the third projection 230′ and the contour of the first projection 211′, respectively, with the fourth characteristic point G as the center, and the arc lengths of the second arc-shaped segment (i.e., arc GP1) and the third arc-shaped segment (i.e., arc GP2) are both within a predetermined arc length range, and a line connecting one end of the second arc-shaped segment (i.e., arc GP1) remote from the fourth characteristic point G (i.e., point P1) and one end of the third arc-shaped segment (i.e., arc GP2) remote from the fourth characteristic point G (i.e., point P2) (i.e., connecting line P1P2) is defined as the third connecting line. In some embodiments, the projection of the decompression hole 214 onto the first symmetry plane 300 may be located on the arc-shaped segment (i.e., arc P1P2) corresponding to the third connecting line P1P2. In some embodiments, the ratio of the second arc length of the arc P1P2 corresponding to the third connecting line P1P2 to the length of the third connecting line P1P2 is defined as a second arc length to chord length ratio. The larger the second arc length to chord length ratio, the greater the curvature of the corresponding arc P1P2, and the greater the concavity of the inner contour near the connection position between the sound generating unit 210 and the ear hook 230 corresponding to the arc P1P2. The smaller the second arc length to chord length ratio, the gentler the corresponding arc P1P2, and the less the concavity of the inner contour near the connection position between the sound generating unit 210 and the ear hook 230 corresponding to the arc P1P2.

[0111] In some embodiments, the projection of the decompression hole 214 onto the first symmetry plane 300 is located on the arc P1P2. Therefore, in order to prevent the decompression hole 214 from being blocked by the auricle when worn, the curvature of the arc P1P2 must be greater than a certain threshold, so that the inner contour near the connection position between the sound generating unit 210 and the ear hook 230 corresponding to the arc P1P2 is sufficiently concave, and the decompression hole 214 located at this concave position will not be blocked by the auricle.

[0112] In some embodiments, the second arc length to chord length ratio is greater than 1.26 to prevent the decompression hole 214 from being blocked by the pinna. In some embodiments, the recess position should not be too deep to prevent the connection portion between the sound generating unit 210 and the ear hook 230 from being too thin, which would affect the connection strength, and the second arc length to chord length ratio may be less than 1.44, i.e., the second arc length to chord length ratio may be 1.26 to 1.44.

[0113] In some embodiments, the sound generating assembly may include a first sound driver and a second sound driver. The first sound driver may include a first diaphragm and a first magnetic circuit assembly (e.g., a first magnet and a first magnetic flux conductive cover) located on one side of the first diaphragm along the vibration direction. The second sound driver may include a second diaphragm and a second magnetic circuit assembly (e.g., a second magnet and a second magnetic flux conductive cover) located on one side of the second diaphragm along the vibration direction. A first sound transmission path may be formed between the first diaphragm and the second diaphragm. The first sound transmission path and the first magnetic circuit assembly are located on opposite sides of the first diaphragm along the vibration direction, and the first sound transmission path corresponds to a front cavity of the first sound driver. At the same time, the first audio transmission passage and the second magnetic circuit assembly are respectively located on both sides along the vibration direction of the second diaphragm, and the first audio transmission passage also corresponds to the front cavity of the second audio driver. Since the first audio transmission passage simultaneously functions as the front cavity of the first audio driver and the second audio driver, the first audio transmission passage is a shared front cavity of the first audio driver and the second audio driver.

[0114] 5 is an exemplary structural diagram of an audio generating unit according to some embodiments of the present disclosure. As shown in FIG. 5, in some embodiments, audio generating assembly 212 may include a first audio driver 2121 and a second audio driver 2122. First audio driver 2121 includes a first diaphragm 21211 and a first magnetic circuit assembly (e.g., a first magnet 21212 and a first magnetic flux conductive cover 21213 spaced apart from first diaphragm 21211) disposed on one side of first diaphragm 21211 along the vibration direction. Second audio driver 2122 includes a second diaphragm 21221 and a second magnetic circuit assembly (e.g., a second magnet 21222 and a second magnetic flux conductive cover 21223 spaced apart from second diaphragm 21221) disposed on one side of second diaphragm 21221 along the vibration direction.

[0115] In some embodiments, the first audio driver 2121 and the second audio driver 2122 are installed opposite each other. Installing two audio drivers opposite each other means that the first diaphragm 21211 of the first audio driver 2121 and the second diaphragm 21221 of the second audio driver 2122 are installed opposite each other. In some embodiments, the front side of the first diaphragm 21211 of the first audio driver 2121 and the front side of the second diaphragm 21221 of the second audio driver 2122 are installed opposite each other. In this case, a first audio transmission path 400 may be formed between the first diaphragm 21211 and the second diaphragm 21221. The first audio transmission passage 400 is located on the front side along the vibration direction of the first diaphragm 21211 (i.e., the side of the first diaphragm 21211 facing away from the first magnetic circuit assembly), and the first magnetic circuit assembly is located on the rear side along the vibration direction of the first diaphragm 21211 (i.e., the side of the first diaphragm 21211 facing the first magnetic circuit assembly), and in this case, the first audio transmission passage 400 corresponds to the front cavity of the first audio driver 2121. At the same time, the first audio transmission path 400 is located on the front side along the vibration direction of the second diaphragm 21221 (i.e., the side of the second diaphragm 21221 facing away from the second magnetic circuit assembly), and the second magnetic circuit assembly is located on the rear side along the vibration direction of the second diaphragm 21221 (i.e., the side of the second diaphragm 21221 facing the second magnetic circuit assembly), and at this time, the first audio transmission path 400 also corresponds to the front cavity of the second audio driver 2122. Because the first audio transmission path 400 functions as the front cavity of the first audio driver 2121 and the second audio driver 2122 at the same time, the first audio transmission path 400 is a shared front cavity of the first audio driver 2121 and the second audio driver 2122.

[0116] In some embodiments, the sound output hole 213 may be acoustically connected to the first sound transmission passage 400. Sound generated on the front side of the first diaphragm 21211 and sound generated on the front side of the second diaphragm 21221 are radiated to the outside through the first sound transmission passage 400 and the sound output hole 213. When two audio drivers share a front cavity, sound waves from the front cavities of the two audio drivers can be guided to the outside of the housing of the audio generating unit through the same sound output hole, thereby simplifying the overall structure of the audio generating unit and reducing the manufacturing cost of the audio generating unit. In some embodiments, because the audio generating assembly 212 includes two audio drivers, the volume of the housing cavity occupied by the two audio drivers may be large. By arranging the first audio driver 2121 and the second audio driver 2122 to share the front cavity, the volume occupied by the two audio drivers can be reduced and other structures (e.g., a battery) can be easily installed in the housing cavity. Furthermore, when the cooperation of the two diaphragms has a greater effect on the change in sound pressure in the first sound transmission passage and the cross-sectional area of ​​the sound output hole does not change, the cooperation of the two sound drivers can increase the volume of the sound emitted from the sound output hole, thereby improving acoustic efficiency.

[0117] In some embodiments, the first audio driver 2121 may include a first magnet 21212 and a first magnetic flux conductive cover 21213 spaced apart from the first diaphragm 21211, and a supporting first frame. The first frame has a plurality of ventilation holes. The second audio driver 2122 includes a second magnet 21222 and a second magnetic flux conductive cover 21223 spaced apart from the second diaphragm 21221, and a supporting second frame. The second frame has a plurality of ventilation holes.

[0118] The first magnetic flux conducting cover 21213 has an open end and a closed end, and the open end of the first magnetic flux conducting cover 21213 is disposed facing the first diaphragm 21211. The first magnet 21212 is located within the first magnetic flux conducting cover 21213, and one end of the first magnet 21212 facing away from the first diaphragm 21211 is connected to the inner wall of the closed end of the first magnetic flux conducting cover 21213. The first frame surrounds the first diaphragm 21211, a first mounting hole is formed at one end of the first frame facing away from the first diaphragm 21211, the first magnetic flux conducting cover 21213 passes through the first mounting hole, the outer wall of the first magnetic flux conducting cover 21213 is connected to the hole wall of the first mounting hole, and the first frame, the first magnetic flux conducting cover 21213 and the first diaphragm 21211 form a cavity which becomes the rear cavity of the first audio driver 2121. Similarly, the second magnetic flux conducting cover 21223 has an open end and a closed end. The open end of the second magnetic flux conducting cover 21223 is positioned facing the second vibration plate 21221, the second magnet 21222 is located within the second magnetic flux conducting cover 21223, and one end of the second magnet 21222 facing away from the second vibration plate 21221 is connected to the inner wall of the closed end of the second magnetic flux conducting cover 21223. The second frame surrounds the second diaphragm 21221, and a second mounting hole is formed at one end of the second frame facing away from the second diaphragm 21221, and the second magnetic flux conductive cover 21223 passes through the second mounting hole, and the outer wall of the second magnetic flux conductive cover 21223 is connected to the hole wall of the second mounting hole, and the second frame, the second magnetic flux conductive cover 21223 and the second diaphragm 21221 form a cavity which becomes the rear cavity of the second audio driver 2122.

[0119] The magnets (including the first magnet 21212 and the second magnet 21222) can be used to generate a magnetic field. When the strength of the magnetic field generated by the magnet changes, the corresponding diaphragm receives a force and changes, causing the corresponding diaphragm to vibrate. When the diaphragm vibrates, the air in the first audio transmission passage 400 vibrates, thereby generating sound waves. The magnetic flux conductive cover can be used to suppress magnetic flux leakage of the magnetic circuit assembly (e.g., magnet, etc.) of the audio driver. The frame mainly supports and fixes the components of the audio driver (e.g., magnet, magnetic flux conductive cover).

[0120] In some embodiments, the materials from which the first magnetic flux conducting cover 21213 and the second magnetic flux conducting cover 21223 are fabricated may include one or a combination of low carbon steel, silicon steel, and ferrite. In some embodiments, the first magnet 21212, the first magnetic flux conducting cover 21213, and the first frame may be the same as or similar to the second magnet 21222, the second magnetic flux conducting cover 21223, and the second frame.

[0121] In some embodiments, the first frame and the first magnetic flux conducting cover 21213 may be connected by adhesive bonding, locking, welding, riveting, etc. For example, the connection between the first frame and the first magnetic flux conducting cover 21213 may be fixed by a sealant. The second frame and the second magnetic flux conducting cover 21223 may be connected by the same or similar connection method as in the previous embodiments.

[0122] In some embodiments, the first audio driver 2121 further includes a first magnetic flux conducting plate 21214 mounted within the first frame, the first magnetic flux conducting plate 21214 connected to a side of the first magnet 21212 closer to the first diaphragm 21211 and adjusting the distribution of the magnetic field generated by the first magnet 21212. Similarly, the second audio driver 2122 further includes a second magnetic flux conducting plate 21224 mounted within the second frame, the second magnetic flux conducting plate 21224 connected to a side of the second magnet 21222 closer to the second diaphragm 21221 and adjusting the distribution of the magnetic field generated by the second magnet 21222. In some embodiments, the first magnetic flux conducting plate 21214 and the second magnetic flux conducting plate 21224 may be the same or similar.

[0123] In some embodiments, the first audio driver 2121 further includes a first coil 21215 disposed within the first frame, the first coil 21215 disposed surrounding a side wall of the first magnet 21212. When a current is passed through the first coil 21215 (for example, by passing a current through the first coil 21215 via a pad on the first frame), the first coil 21215 vibrates under the action of the magnetic field, causing the first diaphragm 21211 to vibrate. Similarly, the second audio driver 2122 further includes a second coil 21225 disposed within the second frame, the second coil 21225 disposed surrounding a side wall of the second magnet 21222. When a current is passed through the second coil 21225 (for example, by passing a current through the second coil 21225 via a pad on the second frame), the second coil 21225 can vibrate under the influence of the magnetic field, causing the second diaphragm 21221 to vibrate. In some embodiments, the first coil 21215 and the second coil 21225 can be the same or similar.

[0124] In some embodiments, a second sound transmission passage may be formed between the first frame and the second frame. The side of the first diaphragm 21211 away from the first sound transmission passage 400 communicates with the second sound transmission passage through an air vent on the first frame. The side of the second diaphragm 21221 away from the first sound transmission passage 400 communicates with the second sound transmission passage through an air vent on the second frame. By way of example only, a gap may be provided between the end face of the first frame facing away from the first diaphragm 21211 and the end face of the second frame facing away from the second diaphragm 21221 and the inner wall of the housing 211, so that a second audio transmission path may be formed between the first frame and the second frame and the housing 211, and a cavity near the end face of the first frame facing away from the first diaphragm 21211 may be in acoustic communication with a cavity near the end face of the second frame facing away from the second diaphragm 21221. The side of the first diaphragm 21211 facing away from the first audio transmission path 400, the first frame, and the first magnetic flux conductive cover 21213 form a rear cavity of the first audio driver 2121. The side of the second diaphragm 21221 facing away from the first audio transmission passage 400, the second frame, and the second magnetic flux conductive cover 21223 form a rear cavity of the second audio driver 2122. The rear cavity of the first audio driver 2121 and the rear cavity of the second audio driver 2122 can be in acoustic communication with the second audio transmission passage via vents on the first frame and vents on the second frame, respectively, and the second audio transmission passage corresponds to a shared rear cavity of the first audio driver 2121 and the second audio driver 2122. In some embodiments, the vents may be located in the magnetic flux conductive cover. The first magnetic flux conductive cover 21213 and the second magnetic flux conductive cover 21223 are each provided with a plurality of ventilation holes, such that the rear cavity of the first audio driver 2121 acoustically communicates with the second audio transmission path through the ventilation holes on the first magnetic flux conductive cover 21213, and the rear cavity of the second audio driver 2122 acoustically communicates with the second audio transmission path through the ventilation holes on the second magnetic flux conductive cover 21223. This type of installation method can also achieve the same or nearly the same effect as ventilation holes installed on the frame.

[0125] In some embodiments, the vent holes on the two frames are both acoustically connected to the decompression holes 214 on the housing 211. The rear cavity of the first audio driver 2121 is acoustically connected to the rear cavity of the second audio driver 2122, and the airflows in the rear cavities of the two audio drivers can be guided to the same decompression hole (e.g., decompression hole 214) via the corresponding vent holes and further to the outside of the housing 211 via the same decompression hole, thereby simplifying the overall structure of the audio generating unit 210 and reducing the manufacturing cost of the audio generating unit 210. In some embodiments, because the audio generating assembly 212 includes two audio drivers, the volume of the housing cavity occupied by the two audio drivers may be large. By arranging the first audio driver 2121 and the second audio driver 2122 to share a rear cavity, the volume occupied by the two audio drivers can be further reduced and other structures (e.g., a battery) can be easily installed in the housing cavity. In some embodiments, when the first audio driver 2121 and the second audio driver 2122 share a rear cavity, a waterproof and breathable membrane may be installed in the sound outlet 213 and / or the second audio transmission passage, which can ensure the sound quality of the ear cuff earphone 200 and also fulfill the functions of waterproofing and dustproofing, thereby improving the reliability of the ear cuff earphone 200.

[0126] In some embodiments, when audio generating unit 210 (or audio generating unit 1410 described below) includes two audio drivers, the diaphragms of the two audio drivers may be the same or similar. That is, first diaphragm 21211 of first audio driver 2121 and second diaphragm 21221 of second audio driver 2122 are the same or similar. The resonant frequencies of first diaphragm 21211 and second diaphragm 21221 may both be lower than 300 Hz, and the difference between the resonant frequencies of first diaphragm 21211 and second diaphragm 21221 may be smaller than 50 Hz. The resonant frequency of a diaphragm refers to the first resonant peak that appears in ascending frequency order when a frequency sweep process is performed on the diaphragm, and corresponds to the position of increase in the impedance curve of the diaphragm. In addition, considering the acoustic characteristics of the two diaphragms, the resonance peak frequencies of the two diaphragms in the embodiments of this specification are both lower than 300 Hz, for example, 200 Hz to 300 Hz, which can better represent the low-frequency portion of the audio signal and thereby achieve a better musical effect. Furthermore, if the first diaphragm 21211 and the second diaphragm 21221 are the same, there is no need to manufacture the first diaphragm 21211 and the second diaphragm 21221 separately, which reduces the types of materials used for manufacturing and reduces costs and production difficulty.

[0127] FIG. 6 is an exemplary structural diagram of a decompression hole according to some embodiments of the present disclosure. As shown in FIG. 6 , in some embodiments, the decompression hole 214 may extend along a direction perpendicular to the first plane of symmetry 300. For example, the outer end surface of the decompression hole 214 may have a strip-like structure extending along a direction perpendicular to the first plane of symmetry 300 (the direction perpendicular to the first plane of symmetry 300 can be considered as the length direction of the outer end surface of the decompression hole 214). In some embodiments, the vent hole on the first frame and the vent hole on the second frame may be located on both sides of the first plane of symmetry 300. The vent hole on the first frame is located on one side of the first plane of symmetry 300, and the vent hole on the second frame is located on the other side of the first plane of symmetry 300.

[0128] In some embodiments, the two ends of the decompression hole 214 may extend to the two vent holes on the frame, respectively. Specifically, the ends of the decompression hole 214 may be understood to extend to the position closest to the center of the vent hole closest to the center of the end. This installation method allows sound emitted from the vent hole to reach the decompression hole 214 via the shortest path and then be guided outside the housing 211.

[0129] In some embodiments, the outer end surface of the decompression hole 214 may be symmetrical with respect to the first plane of symmetry 300. As can be seen from the above, the sound generating assembly 212 includes two audio drivers, and the entire sound generating assembly 212 has a symmetrical structure, for example, the first frame and the second frame are both provided with vent holes, and the sound in the rear cavity of the first audio driver and the sound in the rear cavity of the second audio driver are respectively guided to the decompression hole 214 through the corresponding vent holes. By positioning the outer end surface of the decompression hole 214 symmetrically with respect to the first symmetry plane 300, the path along which the sound in the rear cavity of the first audio driver is guided to the decompression hole 214 through the ventilation hole on the first frame and the path along which the sound in the rear cavity of the second audio driver is guided to the decompression hole 214 through the ventilation hole on the second frame can be made equal or approximately equal, thereby ensuring that the amplitude or phase of the sound in the rear cavity of the first audio driver and the sound in the rear cavity of the second audio driver guided to the outside of the housing 211 through the decompression hole 214 are the same or approximately the same (or the changes in amplitude and phase of the two sounds are approximately the same).

[0130] In some embodiments, the two ends of the decompression hole 214 may have a larger opening size than the middle portion of the decompression hole 214. When the two ends of the decompression hole 214 have a larger opening size than the middle portion, the shape of the decompression hole 214 resembles a "bone."

[0131] In some embodiments, the audio generation assembly 212 may include a mounting bracket, and the first audio driver 2121 and the second audio driver 2122 are attached to the mounting bracket. For example, a first frame is connected to the mounting bracket. The first magnetic flux conductive plate 21214, the first magnet 21212, the first magnetic flux conductive cover 21213, and the first diaphragm 21211 of the first audio driver 2121 are all connected to the mounting bracket via the first frame. That is, the first audio driver 2121 is attached to the mounting bracket via the first frame. Similarly, a second frame is connected to the mounting bracket. The second magnetic flux conductive plate 21224, the second magnet 21222, the second magnetic flux conductive cover 21223, and the second diaphragm 21221 of the second audio driver 2122 are all connected to the mounting bracket via the second frame. That is, the second audio driver 2122 is attached to the mounting bracket via the second frame. In some cases, the first audio driver 2121 and the second audio driver 2122 are mounted on the same mounting bracket, and for example, the mounting bracket is mainly located between the first audio driver 2121 and the second audio driver 2122, so that a portion of the structure of the mounting bracket can be enclosed together with the first audio driver 2121 and the second audio driver 2122 to form a cavity for the first audio transmission path. This can simplify the overall structure of the audio generating unit 210 and reduce the manufacturing cost of the audio generating unit 210. In addition, by simply designing the mounting bracket, the shared cavity between the first audio driver 2121 and the second audio driver 2122 can be adjusted, and the complex structure inside the housing 211 can be prevented from affecting the acoustic effect of the shared cavity. Based on the installation method of the mounting bracket, in some embodiments, the mounting bracket blocks a part of the middle part of the decompression hole 214 (i.e., the area other than the two ends of the decompression hole 214) (e.g., the area indicated by the dotted frame M in the figure), and the area blocked by the mounting bracket in the decompression hole 214 cannot transmit sound to the outside.By setting the two ends of the decompression hole 214 to have larger opening dimensions than the middle portion, the ends of the decompression hole 214 have larger opening dimensions, which allows the sound coming out of the ventilation hole to be more smoothly guided to the outside through the ends of the decompression hole 214.

[0132] In some embodiments, the first maximum distance between the decompression holes 214 and the vent holes on the first frame (or the first magnetic flux conductive cover 21213) may be the same as or approximately the same as the second maximum distance between the decompression holes 214 and the vent holes on the second frame (or the second magnetic flux conductive cover 21223). For example, the ratio of the difference between the first maximum distance and the second maximum distance to the first maximum distance is less than 10%. This installation method can effectively prevent the overall sound generation quality of the audio generating unit 210 from being affected by an excessively large distance between the vent holes of one of the audio drivers and the decompression holes 214. In some embodiments, the maximum distance (first maximum distance or second maximum distance) between the decompression holes 214 and the vent holes (the vent holes of the first audio driver 2121 or the vent holes of the second audio driver 2122) may be less than 0.5 mm.

[0133] In some embodiments, the rear cavity of the audio generating unit 210 (the rear cavity of the first audio driver or the rear cavity of the second audio driver) has a first resonant frequency. The first resonant frequency can be adjusted by adjusting the area of ​​the decompression holes 214. The front cavity of the audio generating unit 210 (the front cavity of the first audio driver or the front cavity of the second audio driver) has a second resonant frequency. The second resonant frequency can be adjusted by adjusting the area of ​​the sound emission holes 213.

[0134] FIG. 7 shows frequency response curves corresponding to rear cavities with different areas of decompression holes according to some embodiments of the present disclosure. The horizontal axis represents frequency in Hz, and the vertical axis represents sound pressure level in dB. The different curves in FIG. 7 are respectively for the case where the area of ​​the sound hole (e.g., sound hole 213) does not change (for example, the area of ​​the sound hole is 6 mm 2 8. The curves 810 show the frequency response curves for the rear cavity when the area of ​​the decompression hole (e.g., decompression hole 214) is 1.5 mm. 2 8. Curve 820 shows the frequency response curves of the rear cavity when the area of ​​the decompression hole is 3 mm 2 8. Curve 830 shows the frequency response curves of the rear cavity when the area of ​​the decompression hole is 4.5 mm 2 8. Curve 840 shows the frequency response curves of the rear cavity when the area of ​​the decompression hole is 6 mm 2 8. Curve 850 shows the frequency response curves of the rear cavity when the area of ​​the decompression hole is 7.5 mm 2 7 shows the frequency response curves of the rear cavity when the sound emitting hole area is the same. As can be seen from FIG. 7, each curve has two resonance peaks, each corresponding to a different resonance frequency. Taking curve 810 as an example, curve 810 has a first resonance peak and a second resonance peak. The first resonance frequency f1 corresponding to the first resonance peak is approximately 3000 Hz, and the second resonance frequency f2 corresponding to the second resonance peak is approximately 5900 Hz. Comparing the curves, it can be seen that the second resonance frequencies corresponding to the second resonance peaks of each curve are almost the same (approximately 5900 Hz), which is because the sound emitting hole area is the same. The sound emitting hole area is the same, and the second resonance frequencies of the front cavity are almost the same. Comparing the curves, the magnitude relationship between the first resonant frequencies corresponding to the first resonant peaks of the curves is: first resonant frequency of curve 810<first resonant frequency of curve 820<first resonant frequency of curve 830<first resonant frequency of curve 840<first resonant frequency of curve 850. As can be seen from the above, within a certain range, as the area of ​​the decompression hole increases, the first resonant frequency corresponding to the first resonant peak of the curve gradually increases.

[0135] FIG. 8 shows frequency response curves corresponding to front cavities with different sound emission hole areas, according to some embodiments herein. The horizontal axis represents frequency in Hz, and the vertical axis represents sound pressure level in dB. The different curves in FIG. 8 are for the case where the area of ​​the decompression hole (e.g., decompression hole 214) is not changed (for example, the area of ​​the decompression hole is 6 mm 2 9. The curve 910 shows the frequency response curves corresponding to the front cavity when the sound outlet area is 3 mm and the sound outlet hole (e.g., sound outlet hole 213) has different areas. 2 9 shows the frequency response curves of the front cavity when the area of ​​the sound emission hole is 4.5 mm 2 9. The curve 930 shows the frequency response curve of the front cavity when the area of ​​the sound emission hole is 6 mm 2 9 shows the frequency response curves of the front cavity when the area of ​​the sound emission hole is 7.5 mm 2 9 shows the frequency response curves of the front cavity when the sound emission hole area is 9 mm 28 shows the frequency response curves of the front cavity when the pressure reduction hole area is the same. As can be seen from FIG. 8, each curve has two resonant peaks, each corresponding to a different resonant frequency. Taking curve 910 as an example, curve 910 has a first resonant peak and a second resonant peak. The first resonant frequency f1 corresponding to the first resonant peak is approximately 4400 Hz, and the second resonant frequency f2 corresponding to the second resonant peak is approximately 4600 Hz. Comparing the curves, it can be seen that the first resonant frequencies corresponding to the first resonant peaks of each curve are almost the same (approximately 4200 Hz), which is because the areas of the decompression holes are the same. When the areas of the decompression holes are the same, the first resonant frequencies of the rear cavities are almost the same. Comparing the curves, the magnitude relationship between the second resonant frequencies corresponding to the second resonant peaks of the curves is: second resonant frequency of curve 910<second resonant frequency of curve 920<second resonant frequency of curve 930<second resonant frequency of curve 940<second resonant frequency of curve 950. As can be seen from the above, within a certain range, as the area of ​​the sound emission hole increases, the second resonant frequency corresponding to the second resonant peak of the curve gradually increases.

[0136] In some embodiments, the second resonant frequency of the front cavity is greater than the first resonant frequency of the rear cavity. When the difference between the second resonant frequency of the front cavity and the first resonant frequency of the rear cavity is large, a dip is formed between the corresponding second resonant peak and the first resonant peak, resulting in undesirable sound in the mid-to-high frequency range (e.g., 3000 Hz to 5000 Hz). For example, in the curve 810 in FIG. 7, the first resonant frequency f1 corresponding to the first resonant peak is approximately 3000 Hz, the second resonant frequency f2 corresponding to the second resonant peak is approximately 5900 Hz, and the difference between the second resonant frequency and the first resonant frequency is approximately 1900 Hz. This results in a large dip between the two resonant peaks, resulting in a low sound pressure level in the frequency range around 4000 Hz and undesirable sound. When the difference between the second resonant frequency of the front cavity and the first resonant frequency of the rear cavity is small, the interval between the corresponding second resonant peak and the corresponding first resonant peak is too small and even overlaps, resulting in a sharp drop in the frequency response curve at high frequencies, resulting in a weak high-frequency response. For example, in the case of curve 910 in FIG. 8 , the first resonant frequency f1 corresponding to the first resonant peak is about 4400 Hz, and the second resonant frequency f2 corresponding to the second resonant peak is about 4600 Hz. The difference between the second resonant frequency and the first resonant frequency is about 200 Hz. The interval between the two resonant peaks is too small, resulting in a sharp drop in the frequency band above 4600 Hz, resulting in a weak high-frequency response of curve 910. Based on this, in some embodiments, by adjusting the area of ​​the sound emitting holes and / or the decompression holes, the difference between the second resonant frequency of the front cavity and the first resonant frequency of the rear cavity can be set within an appropriate range, thereby improving the output effect of the ear cuff type earphone 200 at mid- to high frequencies. In some embodiments, the difference between the second resonant frequency of the front cavity and the first resonant frequency of the rear cavity can be set within a range of 0.5 KHz to 1.5 KHz. In some embodiments, by adjusting the area of ​​the sound emitting holes and / or the decompression holes, the difference between the second resonant frequency of the front cavity and the first resonant frequency of the rear cavity can be set within a range of 0.7 KHz to 1.3 KHz.In some embodiments, by adjusting the area of ​​the sound release holes and / or the pressure reduction holes, the difference between the second resonance frequency of the front cavity and the first resonance frequency of the rear cavity can be set within the range of 0.9 KHz to 1.1 KHz.

[0137] In some embodiments, the area of ​​the decompression holes can be adjusted to make the first resonant frequency of the rear cavity higher than 4.5 KHz. This installation method can ensure that the difference between the second resonant frequency of the front cavity and the first resonant frequency of the rear cavity is within an appropriate range, and can ensure that the frequency response curve is smooth (or the smooth range of the frequency response curve is large) in the mid-low frequency range (e.g., 300 Hz to 4.5 KHz), so that the phase and amplitude of the sound output from the front cavity through the sound output holes 213 and the sound output from the rear cavity through the decompression holes 214 are stable in the mid-low frequency range, for example, approximately opposite in phase and approximately equal in amplitude, thereby enhancing the interference cancellation in the far field between the sound output through the decompression holes 214 and the sound output through the sound output holes 213, and reducing the sound leakage in the far field of the ear cuff type earphone 200.

[0138] In some embodiments, the second resonant frequency of the front cavity can be set to less than 6 KHz by adjusting the area of ​​the sound emitting hole. This installation method can ensure that the difference between the second resonant frequency of the front cavity and the first resonant frequency of the rear cavity is within a suitable range, while also ensuring that the ear cuff type earphone 200 has excellent performance in the mid- to high-frequency range.

[0139] In some embodiments, to ensure that the second resonant frequency of the front cavity is less than 6 KHz, the area of ​​the sound emission hole is 18 mm 2 In some embodiments, to ensure that the volume is sufficiently loud at low frequencies, the area of ​​the sound hole may be 5 mm 2In some embodiments, in order to achieve both the second resonance frequency and the volume at low frequencies, the area of ​​the sound emission hole is 5 mm 2 ~18mm 2 In some embodiments, in order to achieve both the second resonance frequency and the volume at low frequencies, the area of ​​the sound emission hole may be in the range of 8 mm 2 ~16mm 2 may be in the range of

[0140] In some embodiments, the volume of the front cavity can affect the second resonance frequency. When the area of ​​the sound emission hole is the same, there is a negative correlation between the second resonance frequency and the volume of the front cavity. Specifically, the larger the volume of the front cavity, the lower the second resonance frequency, and the smaller the volume of the front cavity, the higher the second resonance frequency. In some embodiments, to ensure that the second resonance frequency is within an appropriate range, the volume of the front cavity is set to 60 mm. 3 ~120mm 3 In some embodiments, to ensure that the second resonant frequency is within a suitable range and that the sound-generating unit 210 has suitable dimensions, the volume of the front cavity is 80 mm 3 ~100mm 3 may be in the range of

[0141] In some embodiments, the area of ​​the decompression hole is 6 mm to ensure that the first resonant frequency of the rear cavity is higher than 4.5 KHz. 2 ~15mm 2 In some embodiments, the volume of the rear cavity can affect the first resonant frequency. For the same area of ​​the decompression hole, the first resonant frequency and the volume of the rear cavity are negatively correlated. Specifically, the larger the volume of the rear cavity, the lower the first resonant frequency, and the smaller the volume of the rear cavity, the higher the first resonant frequency. In some embodiments, to ensure that the first resonant frequency is within an appropriate range, the volume of the rear cavity is set to 80 mm.3 ~180mm 3 In some embodiments, to ensure that the first resonant frequency is within the appropriate range and that the sound-generating unit 210 has appropriate dimensions, the volume of the rear cavity is 100 mm 3 ~160mm 3 The area of ​​the decompression hole may be within the range of . The area of ​​the decompression hole may refer to the total equivalent area of ​​the decompression holes. For example, if there is one decompression hole, the area of ​​the decompression hole is the area of ​​one decompression hole, and if there are multiple decompression holes, the area of ​​the decompression hole is the sum of the areas of the multiple decompression holes.

[0142] FIG. 9 is an exemplary structural diagram of a housing according to some embodiments of the present disclosure. As shown in FIG. 9 , the housing 211 may include a first rigid housing 2111, a second rigid housing 2112 positioned to face the wearer's concha when worn, and a first flexible portion 2113 that contacts the wearer's concha. In some embodiments, the rigid material may be plastic, metal, or other support material suitable for earphone housings to provide greater support and stability to the internal structure of the housing 211 (e.g., the sound generating assembly). In some embodiments, the first rigid housing 2111 and the second rigid housing 2112 surround and form a receiving cavity 2114, and the sound generating assembly is placed within the receiving cavity 2114. The first flexible portion 2113 covers the outer wall of the second rigid housing 2112, and in order to improve comfort when the sound generating portion 210 comes into contact with the wearer, the first flexible portion 2113 can be made of silicone rubber or other skin-friendly flexible material.

[0143] In some embodiments, the first rigid housing 2111 and the second rigid housing 2112 can provide more support for the internal structure. When worn, the second rigid housing 2112 may contact the wearer toward the wearer's concha cavity, and in embodiments herein, the first flexible portion 2113 can cover the outer wall of the second rigid housing 2112, thereby improving the wearing comfort of the earphone.

[0144] In some embodiments, the first flexible portion 2113 covers the outer wall of the second rigid housing 2112, and the first flexible portion 2113 has little effect on the external structure and internal space of the first rigid housing 2111, thereby ensuring the utilization of the internal space of the first rigid housing 2111. Specifically, since the outer wall of the second rigid housing 2112 is covered with the first flexible portion 2113, the second rigid housing 2112 has two layers of walls, and since the outer wall of the housing 211 is not covered with the first flexible portion 2113, or only a portion adjacent to the first rigid housing 2111 is covered with the first flexible portion 2113, the first rigid housing 2111 has only one layer of walls, thereby reducing the volume of the accommodating cavity 2114 occupied by the first rigid housing 2111 and leaving more space for the sound generating assembly, allowing for the accommodation of a sound generating assembly with a larger vibrator (e.g., a sound generating assembly including two sound drivers) and achieving better acoustic effects.

[0145] In some embodiments, the end of the second rigid housing 2112 and the end of the first rigid housing 2111 may be joined and fixed. Since the end of the second rigid housing 2112 and the end of the first rigid housing 2111 are fixed by joining, the fixation is reliable, the occupied size is small, and such joining is convenient for assembly, reducing the assembly process.

[0146] In some embodiments, the sound emitting holes 213 may be located in the second rigid housing 2112 and the first flexible portion 2113. By locating the sound emitting holes 213 in the second rigid housing 2112 and the first flexible portion 2113, the sound emitting holes 213 do not extend to the first rigid housing 2111, which makes it easier to join and fix the end of the first rigid housing 2111 to the end of the second rigid housing 2112, improving accuracy. Furthermore, this installation method makes it possible to avoid misalignment of the sound emitting holes 213 and also makes it easier to attach the steel mesh and tuning mesh to the sound emitting holes 213.

[0147] FIG. 10A is a schematic diagram of a free sound field according to some embodiments of the present disclosure. FIG. 10B is a schematic diagram of a reflected sound field according to some embodiments of the present disclosure. The shading of the gray area in FIGS. 10A and 10B represents the magnitude of the sound pressure level. The higher the gray density, the higher the sound pressure level, and the lower the gray density, the lower the sound pressure level. In some embodiments, when a sound output hole is not blocked by the cavity of the concha, the sound field of the sound output hole is a free sound field, as shown in FIG. 10A. In some embodiments, when a portion of the sound output hole (e.g., sound output hole 213) is blocked by the wall of the cavity of the concha, as shown in FIG. 10B, near the sound transmission direction, the wall of the cavity of the concha forms a reflective wall surface in the sound transmission direction, and the reflective wall surface reflects the sound, and the sound field of the sound output hole is a reflected sound field. The reflected sound waves in the reflected sound field and the source sound waves (ie, the initial sound waves guided from the sound outlet 213) interfere with each other and diffract to form a sound-enhancing region, thereby increasing the sound pressure level of the sound.

[0148] 10C is a diagram of sound pressure level curves of a free sound field and a reflected sound field according to some embodiments of the present disclosure. The horizontal axis represents frequency in Hz, and the vertical axis represents sound pressure level in dB. Curve 1010 represents the free-field sound pressure level curve, and curve 1020 represents the reflected-field sound pressure level curve. Comparing curves 1010 and 1020, it can be seen that the reflected-field sound pressure level is generally higher than the free-field sound pressure level, particularly in the mid-low frequency band (e.g., below 4000 Hz) and the high frequency band (e.g., above 8000 Hz). (This may be understood as the average sound pressure level of the reflected field being higher than the average sound pressure level of the free field.) This phenomenon is also known as the "horn effect."

[0149] 11A is a schematic diagram of the positional relationship between a sound generating unit and a reflecting wall surface according to some embodiments of the present specification. As shown in FIG. 11A, in some embodiments, the linear distance from the center of the sound generating unit (e.g., sound generating unit 210) to the reflecting wall surface can be defined as h, and the included angle between the normal line from the center of the sound generating unit of the sound output hole toward the outside and the line from the center of the sound generating unit to the reflecting wall surface can be defined as θ. The distance h reflects the distance between the sound generating unit and the wall of the cavity of the concha when the device is worn, and the included angle θ reflects the orientation of the sound generating unit with respect to the inner wall of the cavity of the concha when the device is worn. Different values ​​of the distance h / included angle θ result in different sound pressure distributions in the reflected sound field.

[0150] FIG. 11B is a diagram showing sound pressure level curves of reflected sound fields corresponding to different distances h according to some embodiments of the present specification. The different curves in FIG. 11B show sound pressure level curves corresponding to distances h (denoted as h_gap in the figure) of 5 mm, 7.5 mm, 10 mm, 12.5 mm, 15 mm, 17.5 mm, and 20 mm, respectively, under the condition that the included angle θ=0°. Comparing the curves, it can be seen that the smaller the distance h (i.e., the closer the sound generating unit is to the reflecting wall), the higher the sound pressure level at high frequencies. In accordance with the structure of the ear cuff type earphone 200 described above, when the ear cuff type earphone 200 is worn, the outer surface of the housing 211 of the sound generating unit 210 is in close contact with the wall of the concha, and at least a portion of the sound output hole 213 is blocked by the wall of the concha, thereby increasing the volume of sound emitted by the ear cuff type earphone 200 through the sound output hole 213 and transmitted to the wearer's ear canal.

[0151] 11C is a diagram illustrating sound pressure level curves of the reflected sound field corresponding to different included angles θ according to some embodiments of the present disclosure. The different curves in FIG. 11C show sound pressure level curves corresponding to included angles θ (denoted as theta in the figure) of 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, and 330°, respectively, under the condition of a distance h=7.5 mm. Comparing the curves, it can be seen that the sound pressure level of the sound transmitted to the listening point (e.g., the ear canal opening) is higher when the sound emission hole faces both the listening point (e.g., the ear canal opening) and the reflecting wall (when worn).

[0152] FIG. 12 illustrates sound pressure level curves of the reflected sound field corresponding to different distances h according to some embodiments of the present disclosure. The different curves in FIG. 12 represent sound pressure level curves corresponding to distances h of 5 mm, 7.5 mm, 10 mm, 12.5 mm, 15 mm, 17.5 mm, and 20 mm, respectively, when the included angle θ is 300°. In some embodiments, for the same included angle θ, the sound pressure level is maximized when the sound-generating unit contacts the reflecting wall surface and the sound emitting hole is located on one side of the contact point (e.g., the aforementioned characteristic point on the housing 211). As shown by the solid curve in FIG. 12, when the distance h is 5 mm and the included angle θ is 300°, the sound-generating unit contacts the reflecting wall surface and the sound emitting hole is completely located on one side of the contact point, resulting in the sound pressure level being maximized. Corresponding to the structure of the ear cuff type earphone 200 described above, when the ear cuff type earphone 200 is worn, the outer surface of the housing 211 of the sound generating unit 210 is in close contact with the wall of the concha cavity, the characteristic point on the housing 211 (and the area around it) is shielded by the wall of the concha cavity, and when the sound emitting hole 213 is completely located on one side of the characteristic point (for example, the arc BC in FIG. 4A is completely on one side of the first projection point A), it can be ensured that a part of the area of ​​the sound emitting hole 213 is shielded by the wall of the concha cavity, and the unshielded area faces the ear canal opening of the wearer, thereby increasing the listening volume heard by the wearer.

[0153] FIG. 13 shows sound pressure level curves corresponding to different included angles θ at the same frequency and distance h, according to some embodiments of the present specification. (a) to (f) in FIG. 13 respectively show sound pressure level curves corresponding to different included angles θ under the condition that the frequency is 2000 Hz and the distance h is 5 mm (i.e., the sound generating unit is in contact with the reflecting wall surface). The included angles θ corresponding to (a) to (f) in FIG. 13 are 0°, 60°, 120°, 180°, 240°, and 300°, respectively. Comparing (a) to (f) in FIG. 13 shows that when the normal line from the center of the sound generating unit of the sound output hole to the outside is obliquely directed toward the reflecting wall surface (for example, the included angle θ is 60° or 300°), the maximum sound pressure level is obtained on one side (the area of ​​the high sound pressure level region is the largest), and this high sound pressure level region can be considered the listening position.

[0154] 11A to 13, the distance h reflects the distance between the sound generating unit and the wall of the cavity of the concha when the earphones are worn, and the included angle θ reflects the orientation of the sound output hole of the sound generating unit relative to the wall of the cavity of the concha when the earphones are worn. When the distance h and / or the included angle θ vary, the sound pressure distribution in the reflected sound field varies. In the case of the ear cuff type earphones 200 described above, when the distance between the sound generating unit 210 of the ear cuff type earphones 200 and the wall of the cavity of the concha and / or the orientation of the sound output hole 213 of the sound generating unit 210 relative to the wall of the cavity of the concha varies, the volume of the sound output by the ear cuff type earphones 200 via the sound output hole 213 and transmitted to the ear canal of the wearer will differ. When the outer surface of the housing 211 of the sound generating unit 210 is in close contact with the wall of the concha cavity, a portion of the sound output hole 213 is shielded by the wall of the concha cavity, and the sound output hole 213 is positioned completely on one side of the characteristic point on the housing 211, the reflected sound field formed by the sound field of the sound emitted through the sound output hole 213 can be strengthened, thereby increasing the volume of sound that the ear cuff type earphone 200 emits through the sound output hole 213 and transmits to the wearer's ear canal opening.

[0155] 14 is an exemplary structural diagram of another ear cuff earphone according to some embodiments of the present disclosure. The structure of the ear cuff earphone 1400 shown in FIG. 14 is substantially the same as the structure of the ear cuff earphone 200. For example, the structures of the sound generating unit 1410, the contact portion 1420, the ear hook 1430, the housing 1411, and the sound generating assembly 1412 (e.g., the first sound driver 14121, the first diaphragm 141211, the first magnet 141212, the first magnetic flux conducting cover 141213, and the second sound driver 14122, the second diaphragm 141221, the second magnet 141222, the second magnetic flux conducting cover 141223) of the ear cuff type earphone 1400 are approximately the same as the corresponding structures of the ear cuff type earphone 200 (e.g., the sound generating unit 210, the contact portion 220, the ear hook 230, the housing 211, and the sound generating assembly 212). The difference between the structure of the ear cuff earphone 1400 and the structure of the ear cuff earphone 200 is the installation method of the sound output hole 1413 and the installation method of the sound output hole 213. In this embodiment, the sound generating assembly 1412 includes two sound drivers, but in other embodiments, the sound generating assembly 1412 may include only one sound driver.

[0156] In some embodiments, the sound output hole 1413 of the ear cuff earphone 1400 may have an elongated outer end surface, and the outer end surface has a second plane of symmetry parallel to the elongated length direction. In some embodiments, the second plane of symmetry may be perpendicular to the first plane of symmetry 300 of the ear hook 1430. In this installation method, when the ear cuff earphone 1400 is worn, the sound output hole 1413 is less likely to be blocked by the wall of the concha cavity, which allows more sound emitted through the sound output hole 1413 to be transmitted to the wearer's ear canal, increasing the listening volume and improving the listening experience.

[0157] In some embodiments, the sound output hole 1413 is acoustically connected to the front cavity of the sound generating unit 1410, and the sound output hole 1413 outputs sound within the front cavity of the sound generating unit 1410 to the housing 1411. For example, if the sound generating assembly 1412 includes two sound drivers, a first sound transmission passage 1440 is formed between the first diaphragm 141211 of the first sound driver 14121 and the second diaphragm 141221 of the second sound driver 14122, and the first sound transmission passage 1440 forms the front cavity or a part of the front cavity of the two sound drivers. The sound output hole 1413 is acoustically connected to the first sound transmission passage 1440, and any sound generated in front of the two diaphragms is output to the outside of the housing 1411 via the first sound transmission passage 1440 and the sound output hole 1413 and further transmitted to the listening position. As can be seen from the above, whether or not sound output hole 1413 is blocked by the wall of the cavity of the concha when the headphones are worn affects the listening volume heard by the wearer. For example, if sound output hole 1413 is blocked by the wall of the cavity of the concha, the sound emitted to the outside of housing 1411 through sound output hole 1413 is low and the listening volume heard by the wearer is low, and if sound output hole 1413 is not blocked by the wall of the cavity of the concha, the sound emitted to the outside of housing 1411 through sound output hole 1413 is high and the listening volume heard by the wearer is high.

[0158] In some embodiments, the position of the sound emitting holes 1413 on the housing 1411 can be set to ensure that the sound emitting holes 1413 are not blocked by the wall of the concha cavity when the earphone is worn, thereby increasing the listening volume of the wearer. As described above, some areas of the housing 1411 close to the characteristic points of the housing 1411 may be blocked by the wall of the concha cavity, and some areas of the housing 1411 away from the characteristic points of the housing 1411 are not blocked by the wall of the concha cavity. Based on this, in order to ensure that the sound emitting holes 1413 are not blocked by the wall of the concha cavity, the linear distance between the center of the projection of the outer end surface of the sound emitting holes 1413 onto the first symmetry plane 300 and a first projection point (e.g., first projection point A) formed by projecting the characteristic points on the housing 1411 onto the first symmetry plane 300 may be within a range of 7.0 mm to 8.5 mm. The center of the projection of the outer end surface of the sound emitting hole 1413 onto the first plane of symmetry 300 refers to the centroid of the projected shape formed by projecting the outer end surface of the sound emitting hole 1413 onto the first plane of symmetry 300.

[0159] 15 is an exemplary structural diagram of a sound generating unit according to some embodiments of the present disclosure. In some embodiments, as shown in FIG. 15 , when the linear distance between the center of projection of the outer end surface of the sound emitting hole 1413 onto the first plane of symmetry 300 and the first projection point (e.g., first projection point A) is shortest, the sound emitting hole 1413 may be located at a first limit position 1413b on the housing 1411. When the linear distance between the center of projection of the outer end surface of the sound emitting hole 1413 onto the first plane of symmetry 300 and the first projection point (e.g., first projection point A) is longest, the sound emitting hole 1413 may be located at a second limit position 1413a on the housing 1411.

[0160] In some embodiments, when the sound generating assembly 1412 includes two audio drivers, the sound emitting holes 1413 are acoustically connected to the first audio transmission passage 1440. Therefore, different positions of the sound emitting holes 1413 on the housing 1411 result in different extending directions of the first audio transmission passage 1440, which means that the direction / angle of the sound generating assembly 1412 (or diaphragm) within the accommodating cavity is different. In some embodiments, the direction / angle at which the sound generating assembly 1412 is installed within the accommodating cavity is adjustable (this may be understood as the sound generating assembly 1412 being rotatable relative to the housing 1411). For example, the direction / angle at which the sound generating assembly 1412 is installed within the accommodating cavity may be expressed as the angle between the plane of symmetry of the sound generating assembly 1412 and a horizontal plane when installed. The plane of symmetry of the sound generating assembly 1412 refers to the plane of symmetry between the first diaphragm 141211 and the second diaphragm 141221. The first audio driver 14121 and the second audio driver 14122 are located on either side of the plane of symmetry of the audio generating assembly 1412. Note that no matter how the direction / angle at which the audio generating assembly 1412 is installed in the receiving cavity changes, the plane of symmetry of the audio generating assembly 1412 is always perpendicular to the first plane of symmetry 300 of the earhook 1430.

[0161] By adjusting the direction / angle at which the sound generating assembly 1412 is installed within the accommodating cavity, the position of the sound emitting hole 1413 on the housing 1411 can be adjusted, thereby ensuring that the sound emitting hole 1413 is not blocked by the wall of the concha cavity when worn, and increasing the listening volume heard by the wearer.

[0162] In some embodiments, the sound emitting hole 1413 has a central axis. When the outer end surface of the sound emitting hole 1413 is elongated, the outer end surface has four vertices and forms two diagonals, and the axis passing through the intersection of the two diagonals of the elongated outer end surface and perpendicular to the outer end surface is the central axis of the sound emitting hole 1413. In some embodiments, when the sound generating assembly 1412 includes two audio drivers, the central axis of the sound emitting hole 1413 is located on the plane of symmetry between the first diaphragm 141211 and the second diaphragm 141221.

[0163] In some embodiments, the central axis of the sound emitting hole 1413 may be located on the first plane of symmetry 300 of the ear hook 1430. In this case, the first plane of symmetry 300 divides the outer end surface of the sound emitting hole 1413 into two symmetrical or approximately symmetrical parts along the longitudinal extension direction of the outer end surface of the sound emitting hole 1413. In this installation manner, the sound emitting hole 1413 can be installed in the center of the bottom surface of the housing 1411, so that the sound emitting hole 1413 can face the ear canal of the wearer when worn.

[0164] In some embodiments, the central axis of the sound emitting hole 1413 may be offset from the first symmetry plane 300. In this case, the outer end surface of the sound emitting hole 1413 is asymmetric with respect to the first symmetry plane along the longitudinal extension direction of the outer end surface of the sound emitting hole 1413. When wearing the ear cuff type earphone 1400, the ear cuff type earphone 1400 may be tilted due to factors such as gravity or unstable wearing. By offsetting the central axis of the sound emitting hole 1413 from the first symmetry plane 300, it is possible to compensate for tilting due to factors such as gravity when wearing the ear cuff type earphone 1400, so that the sound emitting hole 1413 of the tilted ear cuff type earphone 1400 faces the ear canal, thereby ensuring the listening effect and listening volume.

[0165] In some embodiments, when the ear cuff earphone 1400 is in a worn state, the ear cuff earphone 1400 is tilted due to factors such as gravity, and the tilt angle (i.e., the included angle β described below) is usually between 0° and 30°. In some embodiments, to ensure that the sound output hole 1413 can be directed toward the ear canal when the ear cuff earphone 1400 is tilted, the included angle (i.e., the included angle α described below) formed between the central axis of the sound output hole 1413 and the first symmetry plane 300 may be in the range of 15° to 45°.

[0166] In some embodiments, the sound emitting holes 1413 may be located in the first rigid housing 2111. By locating the sound emitting holes 1413 in the first rigid housing 2111, the sound emitting holes 1413 do not extend to the second rigid housing 2112, which facilitates joining and fixing the end of the first rigid housing 2111 to the end of the second rigid housing 2112, improving accuracy. Furthermore, this installation method can prevent misalignment of the sound emitting holes 1413 and also facilitates attachment of the steel mesh and tuning mesh to the sound emitting holes 1413.

[0167] In some embodiments, the ear cuff earphone 1400 may include two decompression holes (not shown), both of which are located on the housing 1411 of the sound generating unit 1410. In some embodiments, both of the decompression holes may be located on the first rigid housing of the housing 1411. This installation method can ensure that the two decompression holes are far from the sound output hole 1413, thereby reducing the influence of the sound output from the two decompression holes on the volume of the sound output from the sound output hole 1413 at the listening position. In other alternative embodiments, the two decompression holes may be located on the first rigid housing and the second rigid housing, respectively.

[0168] In some embodiments, the acoustic holes (e.g., sound emission holes, decompression holes, microphone holes, ventilation holes, etc.) installed in the ear cuff earphone (e.g., the ear cuff earphone 200, the ear cuff earphone 1400) may be completely symmetrical. Taking the structure of the ear cuff earphone 1400 as an example, the central axis of the sound emission hole 1413 of the ear cuff earphone 1400 may be located on the first symmetry plane 300 of the ear hook 1430, and in this case, the first symmetry plane 300 divides the outer end surface of the sound emission hole 1413 into two symmetrical or approximately symmetrical parts along the length extension direction of the outer end surface of the sound emission hole 1413. If the ear cuff earphone 1400 includes two decompression holes, the two decompression holes may be arranged symmetrically with respect to the first plane of symmetry 300, and by isolating the rear cavity of the first audio driver 2121 from the rear cavity of the second audio driver 2122, the audio signals output from the two audio drivers can be prevented from completely matching, so that the ear cuff earphone 1400 has a certain frequency division function, while by isolating the rear cavity of the first audio driver 2121 from the rear cavity of the second audio driver 2122, mutual interference between the two audio drivers can also be reduced. In addition, other acoustic holes arranged on the ear cuff earphone 1400, such as air vents, microphone holes, etc., may be arranged symmetrically with respect to the first plane of symmetry 300, thereby ensuring that the acoustic holes on the ear cuff earphone 1400 are arranged completely symmetrically.

[0169] As can be seen from the above, when the second symmetry plane of the sound emission hole 1413 is perpendicular to the first symmetry plane 300 of the ear hook 1430, the output volume at the ear canal opening of the wearer of the ear cuff-type earphone 1400 can be adjusted by adjusting the position of the sound emission hole 1413 on the housing 1411.

[0170] Fig. 16 is a schematic diagram of the installation position and wearing state of the sound emission hole according to some embodiments of the present disclosure. Fig. 17 is a schematic diagram of the wearing state at different angles β according to some embodiments of the present disclosure. Fig. 18 is a frequency response curve diagram at the ear canal opening corresponding to different angles of β when α is 0 according to some embodiments of the present disclosure. Fig. 19 is a frequency response curve diagram at the ear canal opening corresponding to different angles of α when β is 0 according to some embodiments of the present disclosure.

[0171] As shown in FIGS. 16 and 17, when the second plane of symmetry of a sound output hole (e.g., sound output hole 1413) is perpendicular to the first plane of symmetry (e.g., first plane of symmetry 300) of an earhook (e.g., earhook 1430), the angle between the normal W extending from the sound generating portion of the sound output hole to the outside and the first plane of symmetry 300 of the earhook can be defined as α, and the angle between the first plane of symmetry 300 of the earhook and the horizontal plane of the human body can be defined as β. As shown in FIG. 18, the horizontal axis represents the frequency (Hz) of the ear cuff earphone, and the vertical axis represents the measured sound pressure level (dB). While α (denoted by alpha in the figure) remains at 0° (i.e., the central axis of the sound output hole is aligned with the first plane of symmetry of the earhook), the angle of β (denoted by beta in the figure) is adjusted to -20°, 0°, and 45°, respectively, to measure the frequency response curve of the sound output from the ear cuff earphone at the opening of the ear canal. As can be seen from FIG. 18, when α=0° and β=-20°, the sound pressure level of the measured frequency response curve of the ear cuff-type earphone is the highest.

[0172] Furthermore, as shown in Fig. 19, while β = 0° (i.e., a wearing state in which the first symmetry plane of the ear hook is parallel to the horizontal plane of the human body), the angle of α is adjusted to -30°, -15°, 0°, 15°, 30°, 45°, and 60°, and the frequency response curve of the sound output from the ear cuff type earphone at the ear canal opening is measured. As can be seen from Fig. 19, when α is within the range of 15° to 45°, the sound pressure level of the measured frequency response curve of the ear cuff type earphone is the highest, that is, the output volume is the loudest.

[0173] Furthermore, when an ear cuff earphone is worn, due to the influence of gravity, β is usually between 0° and 30°, so when β=0° (i.e., when the first symmetry plane of the ear hook is parallel to the horizontal plane of the human body), the included angle α between the normal to the sound output hole and the first symmetry plane of the ear hook is set to be in the range of 15° to 45°, thereby increasing the listening volume in a wearing scenario where β is between 0° and 30°. In accordance with the structure of the ear cuff earphone 1400 described above, that is, by offsetting the sound output hole 1413 from the housing 1411, it is possible to compensate for tilt caused by factors such as gravity when the ear cuff earphone 1400 is worn, and the sound output hole 1413 of the tilted ear cuff earphone 1400 can be directed toward the ear canal, thereby ensuring the listening effect and listening volume.

[0174] Having described the basic concepts above, it will be apparent to those skilled in the art that the detailed disclosure above is provided by way of example only and is not intended to limit the present application. Although not expressly described herein, those skilled in the art may make various changes, improvements, and modifications to the present application. These changes, improvements, and modifications are intended to be suggested by the present application and are therefore within the spirit and scope of the exemplary embodiments of the present application. [Explanation of symbols]

[0175] 100-1, 200, 1400 Ear cuff type earphones 100-11, 210, 1410 Sound generation unit 100-12, 220, 1420 Contact part 100-13, 230, 1430 ear hooks 211, 1411 Housing 2111 First rigid housing 2112 Second Rigid Housing 2113 First flexible section 2114 Containment Cavity 212, 1412 Voice generating assembly 2121, 14121 First Audio Driver 21211, 141211 First diaphragm 21212, 141212 First magnet 21213, 141213 First magnetic flux conducting cover 2122, 14122 Secondary Audio Driver 21221, 141221 Second diaphragm 21222, 141222 Second magnet 21223, 141223 Second magnetic flux conducting cover 213, 1413 Sound emission hole 214 Decompression hole 300 First symmetry plane 400, 1440 First audio transmission channel

Claims

1. A sound generating unit configured to be located in the concha cavity of a wearer and to contact an inner wall of the concha cavity, a housing forming a receiving cavity; a sound generating assembly housed within the housing cavity; and a sound generating unit located in the housing, configured to guide sound generated by the sound generating assembly, the sound generating unit including a sound emission hole having a partial area shielded by a wall of the cavity of the concha. a contact portion configured to contact the back of the wearer's ear; and an ear hook configured to connect the sound generating unit and the contact unit by bypassing the wearer's antihelix and helix.

2. 2. The ear cuff type earphone according to claim 1, wherein the ear hook has a first plane of symmetry, an outer end surface of the sound emission hole is projected onto the first plane of symmetry to form an arc-shaped segment, and the projection of the housing onto the first plane of symmetry has an arc-shaped outer contour, and at least a portion of the arc-shaped outer contour overlaps with the arc-shaped segment.

3. 3. The ear cuff type earphone according to claim 2, wherein the housing has a feature point that is in contact with the abutment portion or closest to the abutment portion, the feature point is projected onto the first symmetry plane to form a first projection point, and an arc length between the first projection point and one of two end points of the arc-shaped segment that is closer to the first projection point is within a range of 1.7 mm to 4.5 mm.

4. 4. The ear cuff type earphone according to claim 3, wherein an arc length between the first projection point and one of the two end points of the arc-shaped segment that is farther from the first projection point is within a range of 12 mm to 15.5 mm.

5. 3. The ear cuff type earphone according to claim 2, wherein the housing is projected onto the first plane of symmetry to form a first projection, the abutment portion is projected onto the first plane of symmetry to form a second projection, a tangent line that is tangent to a lower end point of the first projection and a lower end point of the second projection is a common tangent line, and a first point of contact between the common tangent line and the first projection is on the arc-shaped segment.

6. 6. The ear cuff type earphone according to claim 5, wherein a ratio of an arc length from a first endpoint of the arc-shaped segment to the first tangent point to an arc length from a second endpoint of the arc-shaped segment to the first tangent point is within a range of 0.5 to 0.85, the first endpoint being the endpoint closer to a first projection point of the two endpoints of the arc-shaped segment, the second endpoint being the endpoint farther from the first projection point of the two endpoints of the arc-shaped segment, and the second endpoint of the arc-shaped segment being closer to an ear canal.

7. 6. The ear cuff type earphone according to claim 5, wherein a normal to the first tangent point and a normal to the first endpoint or a normal to the second endpoint of the arc-shaped segment intersect at a center point, a line connecting the first endpoint and the center point and a line connecting the first tangent point and the center point form a first included angle, a line connecting the second endpoint and the center point and a line connecting the first tangent point and the center point form a second included angle, and a ratio of the first included angle to the second included angle is within a range of 0.2 to 1.

3.

8. The ear cuff earphone according to claim 7, wherein the first included angle is in the range of 15° to 55°.

9. The ear cuff earphone according to claim 7, wherein the second included angle is in the range of 40° to 80°.

10. 3. The ear cuff type earphone according to claim 2, wherein the arc length of the arc-shaped segment is in the range of 5.2 mm to 16.7 mm, and the width of the sound emission hole is in the range of 1.4 mm to 2.2 mm.

11. 3. The ear cuff type earphone according to claim 2, wherein a ratio of an arc length of the arc segment to a length of a straight line segment between a first end point and a second end point of the arc segment is in a range of 1.05 to 1.

4.

12. The ear cuff type earphone according to claim 1 , wherein the ear hook has a first plane of symmetry, and the sound emission hole is located on one side of the first plane of symmetry.

13. The ear cuff type earphone according to claim 12, wherein the sound emission hole has an elongated outer end surface, the outer end surface has a second plane of symmetry that is parallel to the longitudinal extension direction of the outer end surface, and the included angle between the first plane of symmetry and the second plane of symmetry is within a range of 15° to 45°.

14. The ear cuff type earphone according to claim 2 or 12, wherein an outer end surface of the sound emission hole is projected onto the first plane of symmetry to form an arc-shaped segment, the ear cuff type earphone further includes a decompression hole, and the shortest straight-line distance between the projection point of the center of the decompression hole onto the first plane of symmetry and the arc-shaped segment is within a range of 8.1 mm to 11 mm.

15. The ear cuff type earphone according to claim 2 or 12, wherein the housing has a feature point that is in contact with the abutment portion or closest to the abutment portion, the feature point being projected onto the first symmetry plane to form a first projection point, the ear cuff type earphone further includes a decompression hole, and an arc length between the projection point of the center of the decompression hole onto the first symmetry plane and the first projection point is within a range of 7.5 mm to 9.5 mm.

16. 2. The ear cuff type earphone according to claim 1, wherein the ear hook has a first plane of symmetry, the sound emission hole has an elongated outer end surface, the outer end surface has a second plane of symmetry parallel to the longitudinal extension direction of the outer end surface, and the second plane of symmetry is perpendicular to the first plane of symmetry.

17. The ear cuff type earphone according to claim 16, wherein the sound emission hole has a central axis positioned on the first plane of symmetry.

18. The ear cuff earphone according to claim 17, wherein the ear cuff earphone further comprises two decompression holes symmetrically disposed with respect to the first plane of symmetry.

19. 17. The ear cuff earphone according to claim 16, wherein the sound emission hole has a central axis that is offset from the first plane of symmetry.

20. 17. The ear cuff type earphone according to claim 16, wherein the housing has a feature point that is in contact with the abutment portion or closest to the abutment portion, the feature point is projected onto the first plane of symmetry to form a first projection point, and the linear distance between the center of projection of the outer end surface of the sound emission hole onto the first plane of symmetry and the first projection point is within a range of 7.0 mm to 8.5 mm.

21. 17. The ear cuff type earphone according to claim 14, wherein the sound generation assembly includes two audio drivers, a first audio transmission passage is formed between diaphragms of the two audio drivers, the sound emission hole is in acoustic communication with the first audio transmission passage, and the first audio transmission passage forms a front cavity or a part of a front cavity of the two audio drivers.

22. 22. The ear cuff earphone of claim 21, wherein each of the audio drivers includes a magnet and a magnetic flux conducting cover spaced apart from the corresponding diaphragm, and a supporting frame, wherein a plurality of air vents are provided in the frame and / or the magnetic flux conducting cover, a second audio transmission path is formed between the two frames, and the rear surfaces of the two diaphragms are in acoustic communication with the second audio transmission path through the air vents on the frame, and the second audio transmission path forms a rear cavity or a part of a rear cavity of the two audio drivers.

23. 23. The ear cuff type earphone according to claim 22, wherein the difference between the resonant frequency of the front cavity and the resonant frequency of the rear cavity is in the range of 0.5 KHz to 1.5 KHz.

24. 24. The ear cuff earphone of claim 23, wherein the resonant frequency of the front cavity is lower than 6 KHz.

25. 24. The ear cuff earphone of claim 23, wherein the resonant frequency of the rear cavity is greater than 4.5 KHz.

26. The area of ​​the sound emitting hole is 5 mm ２ ~18mm ２ 24. The ear cuff earphone of claim 23, wherein the range is:

27. The volume of the front cavity is 60 mm ３ ~120mm ３ 27. The ear cuff earphone of claim 26, wherein the range is:

28. The area of ​​the decompression hole is 6 mm ２ ~15mm ２ 24. The ear cuff earphone of claim 23, wherein the range is:

29. The volume of the rear cavity is 80 mm ３ ~180mm ３ 29. The ear cuff earphone of claim 28, wherein the range is

30. 23. The ear cuff type earphone according to claim 22, wherein the air vents on the two frames are located on either side of the first plane of symmetry, and the decompression hole extends along a direction perpendicular to the first plane of symmetry.

31. The ear cuff earphone according to claim 30, wherein the two ends of the decompression hole extend to the two vent holes on the frame, respectively.

32. 32. The ear cuff earphone of claim 31, wherein the two ends of the decompression hole have a larger opening size than the middle portion of the decompression hole.

33. 2. The ear cuff type earphone according to claim 1, wherein the housing includes a first rigid housing, a second rigid housing, and a first flexible part that contacts the cavity of the concha of the wearer, the first rigid housing and the second rigid housing surrounding each other to form the accommodating cavity, the first flexible part covering an outer wall of the second rigid housing, and the sound emission hole being located in the second rigid housing and the first flexible part.

34. 2. The ear cuff type earphone according to claim 1, wherein the ear hook has a first plane of symmetry, the housing has a feature point that is in contact with the abutment portion or closest to the abutment portion, the feature point is projected onto the first plane of symmetry to form a first projection point, the ear hook is projected onto the first plane of symmetry to form a third projection, the third projection includes an inner contour curve, a point on the inner contour curve that is farthest from the first projection point is a second feature point, and a distance between the first projection point and the second feature point is 15 mm to 20 mm.

35. 35. The ear cuff type earphone according to claim 34, wherein the housing is projected onto the first symmetry plane to form a first projection, a line connecting the first projection point and the second feature point is defined as a first connecting line, a first auxiliary line is drawn through the second feature point on a side biased toward the first projection, an included angle between the first auxiliary line and the first connecting line has a first predetermined value range, an intersection of a curve segment connected to the first projection on the inner contour curve and the first auxiliary line is defined as a fourth feature point, and a line connecting the fourth feature point and the second feature point is defined as a second connecting line, and the first predetermined value range is 30° to 41°.

36. 36. The ear cuff type earphone according to claim 35, wherein a portion of the inner contour curve corresponding to the second connecting line has a first arc length, a ratio of the first arc length to the length of the second connecting line is defined as a first arc length to chord length ratio, and the first arc length to chord length ratio is between 1.05 and 1.

25.

37. 36. The ear cuff type earphone of claim 35, wherein a second arc-shaped segment and a third arc-shaped segment are determined on both sides of the fourth feature point, with the fourth feature point as a center, the arc lengths of the second arc-shaped segment and the third arc-shaped segment are both within a predetermined arc length range, a line connecting one end of the second arc-shaped segment remote from the fourth feature point and one end of the third arc-shaped segment remote from the fourth feature point is defined as a third connecting line, the arc-shaped segment corresponding to the third connecting line has a second arc length, the predetermined arc length range is 2.5 mm to 3.5 mm, a ratio of the second arc length to the length of the third connecting line is defined as a second arc length to chord length ratio, and the second arc length to chord length ratio is 1.26 to 1.

44.

38. 38. The ear cuff earphone according to claim 37, further comprising a decompression hole, the projection of the decompression hole onto the first plane of symmetry being on an arc segment corresponding to the third connecting line.

Images