Ear clip type earphone

Abstract

An embodiment of the present specification provides an ear clip type earphone, comprising: a sounding part configured to be located in a conchae of a wearer and to be in contact with an inner wall of the conchae, the sounding part comprising: a housing forming an accommodating cavity; the sound production assembly is accommodated in the accommodating cavity; the sound outlet hole is formed in the shell, the sound outlet hole is configured to lead out sound generated by the sound production assembly, and a partial area of the sound outlet hole is shielded by the auricular conchae wall; the abutting part is configured to abut against the back of the ear of the wearer; and the ear hook is configured to bypass the antihelix and the helix of the wearer and connect the sound production part and the abutting part.

Description

Ear clip-on headphones

[0001] Cross-references

[0002] This application claims priority to Chinese application No. 202311701969.7 filed on December 11, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of sound-producing instruments, and in particular to an ear-clip earphone. Background Art

[0004] With the development of acoustic output technology, acoustic devices (such as headphones) have been widely used in people's daily lives. They can be used in conjunction with electronic devices such as mobile phones and computers to provide sound playback for users. Ear clip headphones are a new type of headphones. They are usually small in size and can be clamped on the wearer's ear helix for use. Ear clip headphones do not block the ear canal, which not only ensures safety in outdoor scenes, but also provides better wearing comfort than in-ear headphones. However, due to their small size, ear clip headphones have problems such as insufficient volume and the sound quality needs to be improved.

[0005] Therefore, it is necessary to provide an ear clip type earphone to improve the output performance of the ear clip type earphone.

[0006] Summary of the Invention

[0007] An embodiment of the present specification provides an earclip-type earphone, comprising: a sound-emitting portion configured to be located in a wearer's cavum concha and in contact with the inner wall of the cavum concha, the sound-emitting portion comprising: a shell forming a housing; a sound-emitting component accommodated in the housing; a sound outlet hole located in the shell, the sound outlet hole configured to conduct sound generated by the sound-emitting component, wherein a portion of the sound outlet hole is blocked by the cavum concha wall; an abutment portion configured to abut behind the wearer's ear; and an ear hook configured to bypass the wearer's antihelix and auricle and connect the sound-emitting portion and the abutment portion.

[0008] In some embodiments, the ear hook has a first symmetry plane, the outer end surface of the sound outlet is projected on the first symmetry plane to form an arc segment, the projection of the shell on the first symmetry plane has an arc-shaped outer contour, and at least part of the arc-shaped outer contour overlaps with the arc segment.

[0009] In some embodiments, the shell has a characteristic point that is in contact with the abutting portion or is closest to the abutting portion, and the characteristic point is projected on the first symmetry plane to form a first projection point. The arc length between the two endpoints of the arc segment, whichever is closer to the first projection point, and the first projection point is in the range of 1.7 mm to 4.5 mm.

[0010] In some embodiments, an arc length between the first projection point and the endpoint of the arc segment that is farther from the first projection point is within a range of 12 mm to 15.5 mm.

[0011] In some embodiments, the shell is projected on the first symmetry plane to form a first projection, and the abutment portion is projected on the first symmetry plane to form a second projection. The tangent line tangent to the lower end point of the first projection and the lower end point of the second projection is a common tangent line, and the first tangent point of the common tangent line and the first projection is located on the arc segment.

[0012] In some embodiments, the ratio of the arc length between the first endpoint of the arc segment and the first tangent point to the arc length between the second endpoint of the arc segment and the first tangent point is in the range of 0.5-0.85, the first endpoint is the endpoint of the two endpoints of the arc segment that is closer to the first projection point, and the second endpoint is the endpoint of the two endpoints of the arc segment that is farther from the first projection point, wherein the second endpoint of the arc segment is closer to the ear hole.

[0013] In some embodiments, the normal at the first tangent point intersects with the normal at the first endpoint or the second endpoint of the arc segment at the center point, the line connecting the first endpoint and the center point forms a first angle with the line connecting the first tangent point and the center point, the line connecting the second endpoint and the center point forms a second angle with the line connecting the first tangent point and the center point, and the ratio of the first angle to the second angle is in the range of 0.2-1.3.

[0014] In some embodiments, the first angle is in the range of 15°-55°.

[0015] In some embodiments, the second angle is in the range of 40°-80°.

[0016] In some embodiments, the arc length of the arc segment is in the range of 5.2 mm to 16.7 mm, and the width of the sound outlet hole is in the range of 1.4 mm to 2.2 mm.

[0017] In some embodiments, a ratio of an arc length of the arc segment to a length of a straight line segment between a first endpoint and a second endpoint of the arc segment is in a range of 1.05-1.4.

[0018] In some embodiments, the ear hook has a first symmetry plane, and the sound outlet is located on one side of the first symmetry plane.

[0019] In some embodiments, the sound outlet has an elongated outer end surface, the outer end surface has a second symmetry plane parallel to the length extension direction of the outer end surface, and the angle between the first symmetry plane and the second symmetry plane is in the range of 15°-45°.

[0020] In some embodiments, the outer end surface of the sound outlet is projected onto the first symmetry plane to form an arc segment, and the ear clip earphones also include a pressure relief hole, and the shortest straight-line distance between the projection point of the center of the pressure relief hole on the first symmetry plane and the arc segment is in the range of 8.1mm-11mm.

[0021] In some embodiments, the shell has a characteristic point that is in contact with the abutting portion or is closest to the abutting portion, and the characteristic point is projected on the first symmetry plane to form a first projection point. The ear-clip earphone also includes a pressure relief hole, and the arc length between the projection point of the center of the pressure relief hole on the first symmetry plane and the first projection point is in the range of 7.5mm-9.5mm.

[0022] In some embodiments, the ear hook has a first symmetrical plane, the sound outlet has an elongated outer end surface, the outer end surface has a second symmetrical plane parallel to the length extension direction of the outer end surface, and the second symmetrical plane is perpendicular to the first symmetrical plane.

[0023] In some embodiments, the sound outlet has a central axis, and the central axis is located on the first symmetry plane.

[0024] In some embodiments, the ear-clip earphone further includes two pressure relief holes, and the two pressure relief holes are symmetrically arranged with respect to the first symmetry plane.

[0025] In some embodiments, the sound outlet has a central axis, and the central axis deviates from the first symmetry plane.

[0026] In some embodiments, the shell has a characteristic point that is in contact with the abutting portion or is closest to the abutting portion, and the characteristic point is projected on the first symmetry plane to form a first projection point; the straight-line distance between the center of the projection of the outer end surface of the sound outlet on the first symmetry plane and the first projection point is in the range of 7.0mm-8.5mm.

[0027] In some embodiments, the sound-emitting component includes two sound drivers, a first sound transmission channel is formed between the diaphragms of the two sound drivers, the sound outlet is acoustically connected to the first sound transmission channel, and the first sound transmission channel forms a front cavity or part of the front cavity of the two sound drivers.

[0028] In some embodiments, each of the sound drivers includes a magnet and a magnetic cover that are sequentially separated from its corresponding diaphragm, and a basin for support; a plurality of air holes are provided on the basin and / or the magnetic cover, and a second sound transmission channel is formed between the two basins, and the back sides of the two diaphragms are acoustically connected to the second sound transmission channel through the air holes on the basin, and the second sound transmission channel forms the back cavity or part of the back cavity of the two sound drivers.

[0029] 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-1.5 KHz.

[0030] In some embodiments, the resonant frequency of the front cavity is lower than 6 kHz.

[0031] In some embodiments, the resonant frequency of the back cavity is higher than 4.5 KHz.

[0032] In some embodiments, the area of ​​the sound hole is 5mm 2 -18mm 2 within the range.

[0033] In some embodiments, the volume of the front cavity is located at 60mm 3 -120mm 3 within the range.

[0034] In some embodiments, the area of ​​the pressure relief hole is 6mm 2 -15mm 2 within the range.

[0035] In some embodiments, the volume of the rear cavity is 80 mm 3 -180mm 3 within the range.

[0036] In some embodiments, the air holes on the two basin frames are respectively located on both sides of the first symmetry plane, and the pressure relief holes extend in a direction perpendicular to the first symmetry plane.

[0037] In some embodiments, two ends of the pressure relief hole extend to the air holes on the two basin frames respectively.

[0038] In some embodiments, two end portions of the pressure relief hole have larger opening sizes than a middle section of the pressure relief hole.

[0039] In some embodiments, the shell includes a first hard shell, a second hard shell and a first flexible body for contacting the wearer's concha cavity, the first hard shell and the second hard shell enclose the accommodating cavity; the first flexible body covers the outer wall of the second hard shell; and the sound outlet is located on the second hard shell and the first flexible body.

[0040] In some embodiments, the ear hook has a first symmetry plane, and the shell has a feature point that is in contact with the abutting portion or is closest to the abutting portion. The feature point is projected on the first symmetry plane to form a first projection point, and the ear hook is projected on the first symmetry plane to form a third projection. The third projection includes an inner contour curve, and the point on the inner contour curve that is farthest from the first projection point serves as the second feature point. The distance between the first projection point and the second feature point is 15mm-20mm.

[0041] In some embodiments, the shell is projected on the first symmetry plane to form a first projection, and the line connecting the first projection point and the second feature point is defined as a first line. A first auxiliary line is made through the second feature point to the side biased toward the first projection. The angle between the first auxiliary line and the first line has a first preset value range. The intersection of the curve segment on the inner contour curve connected to the first projection and the first auxiliary line is defined as a fourth feature point. The line connecting the fourth feature point and the second feature point is defined as a second line. The first preset value range is 30°-41°.

[0042] In some embodiments, the portion of the inner contour curve corresponding to the second line has a first arc length, and the ratio of the first arc length to the length of the second line is defined as a first arc-chord ratio, and the first arc-chord ratio is 1.05-1.25.

[0043] In some embodiments, with the fourth feature point as the center, a second arc segment and a third arc segment are respectively determined on both sides of the fourth feature point, the arc length of the second arc segment and the arc length of the third arc segment are both within a preset arc length range, the line connecting the end of the second arc segment away from the fourth feature point and the end of the third arc segment away from the fourth feature point is defined as a third line, the arc segment corresponding to the third line has a second arc length, the preset arc length range is 2.5mm-3.5mm, the ratio between the second arc length and the length of the third line is defined as a second arc chord ratio, and the second arc chord ratio is 1.26-1.44.

[0044] In some embodiments, the ear-clip earphone further includes a pressure relief hole, and a projection of the pressure relief hole on the first symmetry plane is located on the arc segment corresponding to the third connecting line. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present application will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0046] FIG1A is a schematic diagram of an exemplary ear according to some embodiments of the present specification;

[0047] FIG1B is a schematic diagram of wearing an ear clip-on headset according to some embodiments of this specification;

[0048] FIG2 is an exemplary structural diagram of an ear-clip earphone according to some embodiments of this specification;

[0049] FIG3 is an exemplary structural diagram of an ear-clip earphone from another angle according to some embodiments of this specification;

[0050] FIG4A is a schematic diagram of a projection of an ear-clip earphone on a first symmetry plane according to some embodiments of this specification;

[0051] FIG4B is a schematic diagram of a projection of an ear-clip earphone on a first symmetry plane according to some embodiments of this specification;

[0052] FIG5 is an exemplary structural diagram of a sound-producing part according to some embodiments of the present specification;

[0053] FIG6 is an exemplary structural diagram of a pressure relief hole according to some embodiments of this specification;

[0054] FIG7 is a frequency response curve of the rear cavity corresponding to pressure relief holes with different areas according to some embodiments of this specification;

[0055] FIG8 is a frequency response curve of the front cavity corresponding to sound outlet holes of different areas according to some embodiments of this specification;

[0056] FIG9 is an exemplary structural diagram of a housing according to some embodiments of the present specification;

[0057] FIG10A is a schematic diagram of a free-field sound field according to some embodiments of this specification;

[0058] FIG10B is a schematic diagram of an acoustic field of a reflection field according to some embodiments of this specification;

[0059] FIG10C is a graph showing sound pressure levels in a free field and a reflected field according to some embodiments of the present specification;

[0060] FIG11A is a schematic diagram showing the positional relationship between a sound-emitting portion and a reflective wall according to some embodiments of this specification;

[0061] FIG11B is a graph showing the sound pressure level of the reflected field corresponding to different distances h according to some embodiments of this specification;

[0062] FIG11C is a graph showing the sound pressure level of the reflected field corresponding to different angles θ according to some embodiments of this specification;

[0063] FIG12 is a graph showing the sound pressure level of the reflected field corresponding to different distances h according to some embodiments of this specification;

[0064] FIG13 is a graph showing sound pressure levels at the same frequency, with the same distance h and different angles θ according to some embodiments of this specification;

[0065] FIG14 is an exemplary structural diagram of another ear-clip earphone according to some embodiments of this specification;

[0066] FIG15 is an exemplary structural diagram of a sound-producing part according to some embodiments of the present specification;

[0067] FIG16 is a schematic diagram of the sound outlet arrangement position and wearing state according to some embodiments of this specification;

[0068] FIG17 is a schematic diagram of wearing states at different β angles according to some embodiments of this specification;

[0069] FIG18 is a frequency response curve diagram of the ear canal opening corresponding to different β angles when α is 0 according to some embodiments of this specification;

[0070] FIG. 19 is a frequency response curve diagram of the ear canal opening corresponding to different α angles when β is 0 according to some embodiments of this specification. DETAILED DESCRIPTION

[0071] To more clearly illustrate the technical solutions of the embodiments of this application, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0072] It should be understood that the terms "system," "device," "unit," and / or "module" used herein are a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0073] As used in this application and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not intended to refer to the singular but may include the plural. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0074] In the description of this specification, it should be understood that the terms "first," "second," "third," "fourth," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of such features. In the description of this specification, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0075] In this specification, unless otherwise specified or limited, terms such as "connected" and "fixed" should be interpreted broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; and can refer to internal communication between two components or an interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this specification based on the specific circumstances.

[0076] FIG1A is a schematic diagram of an exemplary ear according to some embodiments of the present specification. Referring to FIG1A , the ear 100 (also referred to as the auricle) may include an external auditory canal 101, a cavity concha 102, a cymba concha 103, a triangular fossa 104, an antihelix 105, a scaphoid 106, an auricle 107, an earlobe 108, a tragus 109, and an auricle crus 1071. In some embodiments, the acoustic device may be supported by one or more parts of the ear 100 to achieve stability in wearing the acoustic device. In some embodiments, the external auditory canal 101, the cavity concha 102, the cymba concha 103, the triangular fossa 104, and other parts have a certain depth and volume in three-dimensional space, which can be used to meet the wearing requirements of the acoustic device. For example, an acoustic device (e.g., an in-ear headphone) may be worn in the external auditory canal 101. In some embodiments, the wearing of the acoustic device may be achieved by using other parts of the ear 100 other than the external auditory canal 101. For example, the acoustic device can be worn with the help of the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, the helix 107 and other parts or their combinations. In some embodiments, in order to improve the comfort and reliability of the acoustic device in wearing, it is also possible to further use the user's earlobe 108 and other parts. By using other parts of the ear 100 other than the external auditory canal 101 to achieve the wearing of the acoustic device and the propagation of sound, the user's external auditory canal 101 can be "liberated". When the user wears the acoustic device, the acoustic device will not block the user's external auditory canal 101 (or ear canal or ear canal opening), and the user can receive both the sound from the acoustic device and the sound from the environment (for example, horns, car bells, surrounding human voices, traffic control sounds, etc.), thereby reducing the probability of traffic accidents. In some embodiments, the acoustic device can be designed into a structure that is compatible with the ear 100 according to the structure of the ear 100, so as to achieve the wearing of the sound-emitting part of the acoustic device at different positions on the ear. For example, when the acoustic device is an ear clip-on headphone, the ear clip-on headphone may include a sound-emitting portion, an abutting portion, and an ear hook. The ear hook has an arc-shaped structure that can bypass the wearer's antihelix 105 and helix 107, connecting the sound-emitting portion and the abutting portion so that the sound-emitting portion is located in the wearer's cavum concha 102 and contacts the wall of the cavum concha 102, and the abutting portion abuts behind the wearer's ear.

[0077] Different users may have individual differences, resulting in different shapes, sizes, etc. of the ears. For the sake of ease of description and understanding, unless otherwise specified, this specification will mainly use an ear model with a "standard" shape and size as a reference to further describe how the acoustic device in different embodiments is worn on the ear model. For example, a simulator containing a head and its (left and right) ears, such as GRAS 45BC KEMAR, can be made based on ANSI: S3.36, S3.25 and IEC: 60318-7 standards as a reference for wearing an acoustic device, thereby presenting a scenario in which most users normally wear the acoustic device. Just as an example, the ear used as a reference may have the following relevant characteristics: the size of the projection of the auricle on the sagittal plane in the vertical axis direction may be in the range of 49.5mm-74.3mm, and the size of the projection of the auricle on the sagittal plane in the sagittal axis direction may be in the range of 36.6mm-55mm. Therefore, in this application, descriptions such as "wearing by the wearer", "in a wearing state" and "in a wearing state" may refer to the acoustic device described in this application being worn on the ear of the aforementioned simulator. Of course, taking into account the individual differences between different users, the structure, shape, size, thickness, etc. of one or more parts of the ear 100 may have certain differences. In order to meet the needs of different users, the acoustic device can be designed differently. These differentiated designs can be manifested in that the characteristic parameters of one or more structures in the acoustic device (for example, the sound-emitting part, ear hook, etc. mentioned below) can have different ranges of values ​​to adapt to different ears.

[0078] It should be noted that in fields such as medicine and anatomy, the human body can be defined as three basic planes: the sagittal plane, the coronal plane, and the horizontal plane, as well as three basic axes: the sagittal axis, the coronal axis, and the vertical axis. The sagittal plane refers to a plane perpendicular to the ground, cutting along the front-to-back direction of the body (e.g., chest to back), dividing the body into left and right parts. The coronal plane refers to a plane perpendicular to the ground, cutting along the left-to-right direction of the body (e.g., left shoulder to right shoulder), dividing the body into front and back parts. The horizontal plane refers to a plane perpendicular to the ground, cutting along the top-to-bottom direction of the body (e.g., head to feet), dividing the body into top and bottom parts. Accordingly, the sagittal axis refers to the axis along the front-to-back direction of the body and perpendicular to the coronal plane; the coronal axis refers to the axis along the left-to-right direction of the body and perpendicular to the sagittal plane; and the vertical axis refers to the axis along the top-to-bottom direction of the body and perpendicular to the horizontal plane. When the ear of the simulator is observed along the direction of the human coronal axis, a front profile diagram of the ear as shown in FIG1A can be obtained.

[0079] FIG1B is a schematic diagram of wearing an ear-clip headset according to some embodiments of this specification. In some embodiments, the ear-clip headset may include, but is not limited to, air conduction headsets, bone conduction headsets, and headsets that combine air conduction and bone conduction. As shown in FIG1B , the ear-clip headset 100-1 may include a sound-emitting portion 100-11, an abutting portion 100-12, and an ear hook 100-13 connecting the sound-emitting portion 100-11 and the abutting portion 100-12. The ear-clip headset 100-1 can be clamped to the wearer's ear 100 through the cooperation of the ear hook 100-13, the sound-emitting portion 100-11, and the abutting portion 100-12.

[0080] In some embodiments, when the ear clip-on headphone 100-1 is worn, the sound-emitting portion 100-11 is located within the wearer's cavum concha (e.g., cavum concha 102) and is in contact with the wall of the cavum concha. The abutting portion 100-12 abuts against the back of the wearer's ear, for example, against the back of the cavum concha. The two ends of the ear hook 100-13 connect the abutting portion 100-12 and the sound-emitting portion 100-11, respectively. The middle areas of the two ends of the ear hook 100-13 form an extended section with a certain curvature, so that when worn, the ear hook 100-13 can pass around the wearer's antihelix (e.g., antihelix 105) and helix (e.g., helix 107). The ear hook 100-13 can be elastic, such that when the sound-emitting portion 100-11 is away from the abutting portion 100-12, the ear hook 100-13 can provide an elastic force that drives the sound-emitting portion 100-11 toward the abutting portion 100-12. When worn, the elastic force of the ear hook 100-13 can be converted into a clamping force that clamps the sound-emitting part 100-11 and the abutting part 100-12 on both sides of the concha cavity, thereby ensuring wearing stability.

[0081] In some embodiments, to match the shape of the cavum concha, the housing of the sound-producing portion 100-11 needs to resemble the shape of the cavum concha, taking the form of a sphere, a spherical shape, or a spindle shape. This ensures that the sound-producing portion 100-11 makes full contact with the walls of the cavum concha, and the abutment portion 100-12 clamps onto both sides of the cavum concha. Limited by the spatial dimensions of the cavum concha, the housing of the sound-producing portion 100-11 is relatively small, limiting the size of the sound-producing components within the housing and resulting in lower sound efficiency of the sound-producing portion 100-11.

[0082] On this basis, the embodiment of this specification proposes an ear clip-on earphone, comprising: a sound-emitting part, an abutting part, and an ear hook for connecting the sound-emitting part and the abutting part. A sound outlet is provided on the shell of the sound-emitting part. When worn, part of the sound outlet is blocked by the wall of the concha cavity, and the unblocked area of ​​the sound outlet faces the ear canal opening of the wearer. By setting a part of the sound outlet to be blocked by the wall of the concha cavity, the wall of the concha cavity constitutes a reflective wall surface in the direction of sound propagation near the direction of sound propagation, and the reflective wall surface reflects the sound, thereby forming a reflection field of the sound derived from the sound outlet. In the reflection field, the mutual interference and diffraction between the reflected sound wave and the sound source sound wave (i.e., the original sound wave derived from the sound outlet) can form a sound enhancement area, thereby enhancing the volume of the sound transmitted to the ear canal opening of the wearer.

[0083] Figure 2 is an exemplary structural diagram of an ear clip earphone according to some embodiments of the present invention. Figure 3 is an exemplary structural diagram of an ear clip earphone according to some embodiments of the present invention from another angle. Figure 2 is a front view of the ear clip earphone when placed upright on a horizontal surface (e.g., a tabletop), and Figure 3 is a front view of the ear clip earphone when placed horizontally on a horizontal surface (e.g., a tabletop). In conjunction with Figures 2 and 3, in some embodiments, the ear clip earphone 200 may include a sound-emitting portion 210, an abutting portion 220, and an ear hook 230 for connecting the sound-emitting portion 210 and the abutting portion 220. The ear hook 230 has an overall arc-shaped structure. In light of the above, when the ear clip earphone 200 is worn, the ear hook 230 can pass around the wearer's antihelix (e.g., antihelix 105) and helix (e.g., helix 107), allowing the sound-emitting portion 210 to be located in the wearer's cavum concha (e.g., cavum concha 102) and contact the wall of the cavum concha, while the abutting portion 220 abuts against the back of the wearer's ear. The sound-emitting portion 210 and the contact portion 220 form a clamping configuration to clamp the ear, thereby clamping the ear clip-on earphone 200 on the wearer's helix and ensuring stable wearing of the ear clip-on earphone 200 .

[0084] The sound-producing unit 210 is a sound-producing device. It converts electrical signals into sound signals and plays these sound signals to the wearer. For example, the sound signals generated by the sound-producing unit 210 can be transmitted to the wearer's ear canal through the sound outlet 213 of the sound-producing unit 210.

[0085] In some embodiments, as shown in Figure 3, the sound-emitting portion 210 may include a housing 211, a sound-emitting component (e.g., sound-emitting component 212 in Figure 5), and a sound outlet 213. The housing 211 may be a hollow frame. The ear hook 230 is connected to the housing 211. The housing 211 may form a housing for accommodating other components of the sound-emitting portion 210 (e.g., the sound-emitting component). In some embodiments, the housing 211 may include a first hard shell (e.g., first hard shell 2111 in Figure 9) and a second hard shell (e.g., second hard shell 2112 in Figure 9), the first and second hard shells enclosing the housing. One of the two hard shells (e.g., the second hard shell) faces the wearer's cavum concha and contacts the wall of the cavum concha. The other hard shell is connected to the ear hook 230. In some embodiments, the hard shells may be made of plastic, metal, or other materials that can be used as support materials for earphone housings to provide better support and stability for the internal structures of the housing 211 (e.g., the sound-emitting component). In some embodiments, the housing 211 may further include a flexible housing (e.g., the first flexible body 2113 in FIG. 9 ). The outer surface of one of the two hard housings that contacts the wall of the wearer's cavum concha (e.g., the second hard housing) may be covered with a flexible housing. This flexible housing can improve the wearing comfort of the ear clip earphone 200 and the fit of the ear clip earphone 200 to the user's ear (e.g., the cavum concha). For more information about the housing 211, see elsewhere in this specification, for example, FIG. 9 and its related description.

[0086] The sound-generating component is a module that can convert electrical signals into sound signals. The sound-generating component is located in the accommodating cavity formed by the housing 211. In some embodiments, the sound-generating component may include a sound driver (also known as a speaker). The sound driver can convert electrical signals into sound signals and output them. For example, the sound driver can have a diaphragm, a coil that can drive the diaphragm to vibrate, and a magnetic circuit component (for example, a magnet, a magnetic shield). The diaphragm can separate the cavity structure of the sound-generating part 210 into a front cavity and a rear cavity. The sound driver has a front side and a rear side. The front side of the sound driver can be the side of the diaphragm facing away from the magnetic circuit component, and the rear side of the sound driver can be the side of the diaphragm facing the magnetic circuit component or the side of the magnetic circuit component facing away from the diaphragm. When vibrating, the side of the diaphragm facing away from the magnetic circuit component and the side facing the magnetic circuit component will respectively generate sound. The sound generated by the side of the diaphragm facing away from the magnetic circuit component is radiated outward through the front cavity, and the sound generated by the side of the diaphragm facing the magnetic circuit component is radiated outward through the rear cavity. In some embodiments, the sound-generating component may include two sound drivers. The two sound drivers are arranged opposite to each other (that is, the diaphragms of the two sound drivers are arranged opposite to each other), and a sound transmission channel (also called a first sound transmission channel) is formed between the diaphragms of the two sound drivers. The first sound transmission channel is acoustically connected to the sound outlet 213, and the first sound transmission channel forms the front cavity of the two sound drivers or a part of the front cavity (it can also be understood that the two sound drivers share the front cavity). In some embodiments, each sound driver may include a magnet and a magnetic shield that are sequentially away from its corresponding diaphragm, and a basin for support. Another sound transmission channel (also called a second sound transmission channel) can be formed between the two basins, and the backs of the two diaphragms are acoustically connected to the second sound transmission channel through the air holes on the basin, and the second sound transmission channel forms the back cavity of the two sound drivers or a part of the back cavity (it can also be understood that the two sound drivers share the back cavity). More descriptions about the sound-emitting components can be found elsewhere in this specification, for example, Figure 5, and its related descriptions.

[0087] As shown in Figure 3, the sound outlet 213 is located on the shell 211, and the sound outlet 213 can output the sound generated by the sound-emitting component. In some embodiments, the outer end surface shape structure of the sound outlet 213 can be a strip structure (for example, a long strip). In some embodiments, the sound outlet 213 can be set in the center of the shell 211. In this case, the outer end surface of the sound outlet 213 is symmetrical with respect to the bisecting plane of the bottom surface of the shell 211. The bottom surface of the shell 211 refers to the side opposite to the end surface connecting the shell 211 and the ear hook 230. When worn, the bottom surface of the shell 211 faces the wearer's ear canal (such as the external auditory canal 101). The bisecting plane of the bottom surface refers to a plane parallel to the extension direction of the ear hook 230 (or, it can also be a plane parallel to or coincident with the first symmetry plane 300 of the ear hook 230 described later), and this plane divides the bottom surface of the shell 211 into two symmetrical (or approximately symmetrical) parts. In some embodiments, the sound outlet 213 can also be offset on the shell 211. In this case, the outer end surface of the sound outlet 213 is asymmetric with respect to the bisecting surface of the bottom surface of the shell 211. For example, the sound outlet 213 is located on one side of the symmetry plane of the ear hook 230 (such as the first symmetry plane 300 described later). In some embodiments, the sound outlet 213 can face the wearer's ear canal opening, and the sound outlet 213 is not blocked by the concha cavity wall. The sound field of the sound derived from the sound outlet 213 is a free field, and the volume of the sound in the free field is relatively low, which results in a relatively low volume transmitted to the wearer's ear canal opening. In order to increase the volume of the sound derived from the sound outlet 213 transmitted to the ear canal opening, in some embodiments, by designing the position of the sound-emitting portion 210 in the concha cavity and the position of the sound outlet 213 on the shell 211, a part of the area of ​​the sound outlet 213 can be blocked by the concha cavity wall, and the unblocked area of ​​the sound outlet 213 faces the wearer's ear canal opening. By partially blocking the sound outlet 213 with the concha wall, the sound field of the sound output from the sound outlet 213 can be formed into a reflection field, thereby enhancing the volume of the sound transmitted to the ear canal opening. Specifically, when the sound outlet 213 is partially blocked by the concha wall, the concha wall forms a reflective wall in the direction of sound propagation near the sound propagation direction. This reflective wall reflects the sound. The mutual interference and diffraction between the reflected sound waves and the source sound waves (i.e., the original sound waves output from the sound outlet 213) can form a sound enhancement area, thereby increasing the volume of the sound. In some embodiments, the parameters of the sound outlet 213 and / or the housing 211 can be set so that a portion of the sound outlet 213 is blocked by the concha wall, thereby generating reflection enhancement, and a portion of the sound outlet 213 is unblocked, with the unblocked area of ​​the sound outlet 213 facing the ear canal, so that sound can be transmitted to the wearer's ear canal in a timely and accurate manner, thereby improving the listening experience and listening volume. For more descriptions of the free field and the reflected field, see FIG. 10A to FIG. 13 and their related descriptions.For more descriptions on parameter settings of the sound outlet 213 and / or the housing 211 , please refer to other places in this specification, for example, FIG. 4A and its related descriptions.

[0088] The abutment portion 220 abuts against the back of the wearer's ear, and the abutment portion 220 cooperates with the sound-emitting portion 210 to form a clamping configuration to clamp the ear. In some embodiments, the abutment portion 220 may have an abutment shell, and the abutment portion 220 is connected to the ear hook 230 through the abutment shell. The abutment shell can form a storage space. In some embodiments, the storage space formed by the abutment shell can serve as a battery compartment for accommodating batteries and / or other components (such as circuit boards). In some embodiments, the battery can provide electrical energy for the ear clip-on headphones 200. For example, the battery can be electrically connected to the sound-emitting component of the sound-emitting portion 210 so that the battery can provide electrical energy for the sound of the sound-emitting component. In some embodiments, the circuit board can be electrically connected to the sound-emitting component of the sound-emitting portion 210 (for example, electrically connected via a wire or a flexible circuit board) so that the circuit board can control the sound of the sound-emitting component. In some embodiments, the circuit board and the battery can both be arranged in the storage space formed by the abutment shell. In some embodiments, the circuit board and the battery can also be respectively arranged in the accommodation space formed by the abutting shell and the accommodation cavity formed by the shell 211 of the sound-emitting part 210, and the circuit board and the battery can be electrically connected to each other through corresponding conductors, and further electrically connected to the sound-emitting components of the sound-emitting part 210 through conductors.

[0089] In light of the above, when worn, the earhook 230 can bypass the wearer's antihelix (such as the antihelix 105) and helix (such as the helix 107), allowing the sound-producing portion 210 to be located in the wearer's cavum concha and in contact with the wall of the cavum concha, while the abutment portion 220 abuts the back of the wearer's ear. In some embodiments, the earhook 230 may be provided with a titanium wire extending along the extension direction of the earhook 230. Compared to other materials, titanium wire offers superior mechanical strength, toughness, and light weight, thereby ensuring the stability and comfort of the ear clip-on headphone 200. In some embodiments, the earhook 230 may be provided with a titanium sheet. The titanium sheet has a sheet-like structure and extends along the extension direction of the earhook 230. The surface of the titanium sheet is perpendicular to the plane of symmetry of the earhook 230 along its extension direction (i.e., the first plane of symmetry 300). During or during wear, the titanium sheet can reduce or prevent twisting of the earhook 230, further improving the stability and comfort of the ear clip-on headphone 200. In some embodiments, the ear hook 230 may include a first connecting section, an extension section, and a second connecting section connected in sequence. The first connecting section, the extension section, and the second connecting section are all arc-shaped structures. The first connecting section refers to the portion where the ear hook 230 connects to the sound-emitting portion 210, the second connecting section refers to the portion where the ear hook 230 connects to the abutting portion 220, and the extension section refers to the region between the first connecting section and the second connecting section. In some embodiments, by setting the parameters of the first connecting section (e.g., arc length, curvature, etc.), it is possible to ensure that the sound-emitting portion 210 does not hit the tragus and does not block the wearer's ear canal, thereby improving the wearing comfort and safety of the ear clip-on earphone 200. In some embodiments, the curvature of the second connecting section can be set to be larger (i.e., the second connecting section has a higher degree of curvature), thereby making the overall layout of the ear clip-on earphone 200 more compact, reducing the space occupied by the ear clip-on earphone 200, and improving the convenience of storage or carrying. The curvature of the second connecting segment can refer to the curvature of the inner or outer contour of the second connecting segment projected onto the plane of symmetry (i.e., first plane of symmetry 300) along the ear hook 230's extension direction. In some embodiments, the extension length of the extension segment can be set to a larger value (e.g., greater than a length threshold) to ensure that the ear clip-on headphone 200 can accommodate different ear sizes. The extension length refers to the length of the extension segment along the extension direction.

[0090] In some embodiments, the ear hook 230 may have a first plane of symmetry. Referring to FIG3 , 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 substantially 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 approximately symmetrical parts. The extension direction of the ear hook 230 refers to the direction from the end of the ear hook 230 connected to the abutting portion 220 toward the end of the ear hook 230 connected to the sound-emitting portion 210.

[0091] In some embodiments, the outer end surface of the sound outlet 213 can be in the shape of a curved strip structure. As described above, the sound outlet 213 can be centrally located or offset on the housing 211. In conjunction with Figure 3, when the sound outlet 213 is centrally located on the housing 211, the outer end surface of the sound outlet 213 can be symmetrical about the first symmetry plane 300; when offset on the housing 211, the outer end surface of the sound outlet 213 is asymmetrical about the first symmetry plane 300. It can be understood that since the housing 211 of the sound-emitting portion 210 has a certain thickness, the sound outlet 213 is provided on the housing 211 to direct the sound output by the sound-emitting component to the outside of the ear-clip headphone 200, and therefore, the sound outlet 213 also has a certain depth. Based on this, the outer end surface of the sound outlet 213 can refer to the end surface of the sound outlet 213 located on the outer wall surface of the housing 211.

[0092] In some embodiments, the outer end surface of the sound outlet 213 may be projected onto the first plane of symmetry 300 to form an arc segment. The projection of the housing 211 onto the first plane of symmetry 300 has an arc-shaped outer contour, at least partially overlapping the arc segment. For ease of description, the arc segment formed by the projection of the outer end surface of the sound outlet 213 onto the first plane of symmetry 300 will be referred to as simply the arc segment of the sound outlet 213, and the arc-shaped outer contour of the projection of the housing 211 onto the first plane of symmetry 300 will be referred to as simply the arc-shaped outer contour of the housing 211. In some embodiments, the sound-emitting portion 210 (or housing 211) may be 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. Because the sound outlet 213 is provided on the housing 211 of the sound-emitting portion 210, the outer end surface of the sound outlet 213 has an arc-shaped structure. Based on this, it can be seen that the projection of the outer end surface of the sound outlet 213 onto the first plane of symmetry 300 may form an arc segment. Furthermore, when the outer end surface of the sound outlet hole 213 is symmetrical with respect to the first symmetry plane 300 , the arc segment of the sound outlet hole 213 overlaps with at least a portion of the arc-shaped outer contour of the housing 211 .

[0093] By arranging at least a portion of the arc-shaped outer contour of the shell 211 to overlap with the arc-shaped segment of the sound outlet 213, it can be ensured that the outer end surface of the sound outlet 213 is symmetrical about the first symmetry plane 300, thereby ensuring that a part of the area of ​​the sound outlet 213 can be blocked by the wall of the concha cavity when worn, so that the sound field of the sound derived from the sound outlet 213 is a reflection field, forming emission enhancement, thereby increasing the volume heard by the wearer.

[0094] Figure 4A is a schematic projection diagram of an ear clip headphone according to some embodiments of this specification on a first plane of symmetry. In some embodiments, the housing 211 has a characteristic point that contacts the abutment 220 or is closest to the abutment 220. In some embodiments, when the ear clip headphone 200 is in a natural state (i.e., not worn), the housing 211 of the sound-producing portion 210 may contact the abutment 220. When the housing 211 and the abutment 220 are in point contact, the point on the housing 211 that contacts the abutment 220 is the characteristic point. Point contact here can mean that the point on the housing 211 that contacts the abutment 220 is a point, or that the contact area on the housing 211 that contacts the abutment 220 is small and can be approximated as a point. When the housing 211 and the abutment 220 are in surface contact, the centroid of the contact surface on the housing 211 that contacts the abutment 220 is the characteristic point. In some embodiments, when the ear clip-on headphone 200 is in a natural state, the housing 211 of the sound-emitting portion 210 and the abutting portion 220 may not be in contact, but rather separated by a certain distance. In this case, the point on the housing 211 closest to the abutting portion 220 is a characteristic point. The point on the housing 211 closest to the abutting portion 220 is the point where the shortest line connecting the housing 211 and the abutting portion 220 is located at the endpoint on the housing 211. In some embodiments, as shown in FIG4A , the characteristic point on the housing 211 is projected onto the first symmetry plane 300 to form a first projection point A.

[0095] Continuing with FIG4A , the projection of the sound outlet 213 onto the first symmetry plane 300 forms an arc segment, which can be represented by the arc BC formed by points B and C in FIG4A . The arc segment includes two endpoints: a first endpoint B and a second endpoint C. The first endpoint B is the one closer to the first projection point A of the arc segment. The second endpoint C is the one farther from the first projection point A of the arc segment.

[0096] Because the characteristic point on the housing 211 is located in the area closest to the abutment portion 220, when the ear clip earphone 200 is worn, the housing 211 and the abutment portion 220 form a clamping relationship within and outside the concha cavity, thus obstructing the characteristic point on the housing 211. Consequently, the portion of the sound outlet 213 closer to the characteristic point on the housing 211 can be obstructed by the concha cavity wall, while the portion of the sound outlet 213 farther from the characteristic point on the housing 211 is not obstructed by the concha cavity wall. Corresponding to the projection curve or projection point, the area of ​​the arc segment of the sound outlet 213 closer to the first projection point A is obstructed by the concha cavity wall, while the area farther from the first projection point A is not obstructed. This means that when a portion of the sound outlet 213 is obstructed by the concha cavity wall, the first obstructed area is the first endpoint B of the arc segment and the area near the first endpoint B; the unobstructed area of ​​the sound outlet 213 is the second endpoint C of the arc segment and the area near the second endpoint C. The second endpoint C is closer to the ear canal than the first endpoint B. Therefore, the distance (e.g., arc length) between the first endpoint B and / or the second endpoint C of the arc segment and the first projection point A can affect the position of the sound outlet 213 relative to the cavum concha when worn, thereby affecting whether the cavum concha wall can partially block or not block the sound outlet 213.

[0097] In some embodiments, to ensure that a portion of the sound outlet 213 is shielded by the concha wall, the arc length between the first endpoint B of the arc segment and the first projection point A is within a range of 1.7 mm to 4.5 mm. In some embodiments, to ensure that a portion of the sound outlet 213 is shielded by the concha wall, the arc length between the first endpoint B of the arc segment and the first projection point A is within a range of 2 mm to 4 mm.

[0098] In some embodiments, to ensure that a portion of the sound outlet 213 is not blocked by the concha wall, the arc length between the second endpoint C of the arc segment and the first projection point A is within a range of 12 mm to 15.5 mm. In some embodiments, to ensure that a portion of the sound outlet 213 is not blocked by the concha wall, the arc length between the second endpoint C of the arc segment and the first projection point A is within a range of 13 mm to 15 mm.

[0099] It is understood that the arc segment of the sound outlet 213 overlaps at least partially with the arc-shaped outer contour of the housing 211. Therefore, the first endpoint B and the second endpoint C of the arc segment are both on the arc-shaped outer contour of the housing 211. A characteristic point is a "point" on the outer wall of the housing 211. Therefore, the first projection point A of the characteristic point is also on the arc-shaped outer contour of the housing 211. Therefore, the arc line between the first endpoint B / second endpoint C and the first projection point A is a partial arc line of the arc-shaped outer contour of the housing 211.

[0100] In some embodiments, the housing 211 is projected onto the first symmetry plane 300 to form a first projection 211', and the abutment portion 220 is projected onto the first symmetry plane 300 to form a second projection 220'. The first projection 211' and the second projection 220' share a common tangent line L. The common tangent line L is a tangent line that is tangent to both the lower endpoints of the first projection 211' and the lower endpoints of the second projection 220'. It should be noted that when the ear clip-on headphone 200 is placed upright on a horizontal surface (e.g., a tabletop), the sound-emitting portion 210 and the abutment portion 220 face and contact the horizontal surface, while the ear hook 230 does not. This allows the ear clip-on headphone 200 to remain stable and prevent tipping. Therefore, the lower endpoint of the first projection 211' refers to the projection point formed on the first symmetry plane 300 by the intersection of the sound-emitting portion 210 and the horizontal surface (or the centroid of the contact surface between the sound-emitting portion 210 and the horizontal surface) when the ear clip-on headphone 200 is placed upright on the horizontal surface. The lower endpoint of the second projection 220 ′ refers to a projection point formed by projecting the intersection of the abutting portion 220 and the horizontal plane (or the centroid of the contact surface between the abutting portion 220 and the horizontal plane) onto the first symmetry plane 300 when the ear clip earphone 200 is placed upright on the horizontal plane.

[0101] In some embodiments, the common tangent line L is tangent to the first projection 211' at its lower endpoint, with the point of tangency being referred to as the first tangent point D. When the ear clip earphone 200 is worn, the first tangent point D corresponds approximately to a position directly opposite the ear canal opening. In some embodiments, the first tangent point D between the common tangent line L and the first projection 211' can be located on the arc segment of the sound outlet 213 (as shown in FIG4A , the first tangent point D is located on arc BC). In conjunction with the above, when a portion of the sound outlet 213 is obscured by the inner wall of the cavum concha, the first portion to be obscured is the first endpoint B of the arc segment and the portion near the first endpoint B. The portion of the sound outlet 213 that is not obscured is the second endpoint C of the arc segment and the portion near the second endpoint C. Therefore, the majority of the area of ​​the arc segment of the sound outlet 213 between the first tangent point D and the first endpoint B is obscured by the cavum concha wall, while the area of ​​the arc segment of the sound outlet 213 between the first tangent point D and the second endpoint C is virtually unobstructed by the cavum concha wall.

[0102] Since most of the area between the first tangent point D and the first endpoint B on the arc segment of the sound output hole 213 can be blocked by the concha wall, the area between the first tangent point D and the second endpoint C on the arc segment of the sound output hole 213 is almost never blocked by the concha wall. Therefore, the position of the first tangent point D on the arc segment can affect the size of the area of ​​the sound output hole 213 that is blocked or not blocked by the concha wall. For example, when the first tangent point D is closer to the first endpoint B, the area of ​​the sound output hole 213 that is blocked is smaller and the area that is not blocked is larger; when the first tangent point D is closer to the second endpoint C, the area of ​​the sound output hole 213 that is blocked is larger and the area that is not blocked is smaller.

[0103] In some embodiments, to ensure that the obstructed area and / or the unobstructed area of ​​the sound outlet 213 are of appropriate size to enhance the effect of the reflected field on sound reinforcement, the ratio of the arc length between the first endpoint B of the arc segment and the first tangent point D to the arc length between the second endpoint C of the arc segment and the first tangent point D is within the range of 0.5-0.85. In some embodiments, to ensure that the obstructed area and / or the unobstructed area of ​​the sound outlet 213 are of appropriate size, the ratio of the arc length between the first endpoint B of the arc segment and the first tangent point D to the arc length between the second endpoint C of the arc segment and the first tangent point D is within the range of 0.6-0.75.

[0104] In some embodiments, the normal at the first tangent point D intersects the normal at the first endpoint B or the normal at the second endpoint C of the arc segment at a center point O. In some embodiments, when the first tangent point D, the first endpoint B, and the second endpoint C are cocircular, the normal at the first tangent point D, the normal at the first endpoint B, and the normal at the second endpoint C intersect at a 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 cocircular, the center point may be the intersection of the normal at the first tangent point D and the normal at the first endpoint B; alternatively, the center point may be the intersection of the normal at the first tangent point D and the normal at the second endpoint C.

[0105] In some embodiments, the line connecting the first endpoint B and the center point O forms a first angle (e.g., ∠BOD) with the line connecting the first tangent point D and the center point O, and the line connecting the second endpoint C and the center point O forms a second angle (e.g., ∠COD) with the line connecting the first tangent point D and the center point O. The magnitude of the first angle can reflect the arc length between the first tangent point D and the first endpoint B of the arc segment. Specifically, a larger first angle indicates a longer arc length between the first tangent point D and the first endpoint B of the arc segment; a smaller first angle indicates a shorter arc length between the first tangent point D and the first endpoint B of the arc segment. Similarly, the magnitude of the second angle can reflect the arc length between the first tangent point D and the second endpoint C of the arc segment. Specifically, a larger second angle indicates a longer arc length between the first tangent point D and the second endpoint C of the arc segment; a smaller second angle indicates a shorter arc length between the first tangent point D and the second endpoint C of the arc segment. The ratio of the first angle to the second angle can reflect the position of the first tangent point D on the arc segment. For example, a larger ratio of the first angle to the second angle indicates that the first tangent point D is closer to the second endpoint C of the arc segment, and in this case, the area of ​​the sound outlet 213 that is blocked is larger. A smaller ratio of the first angle to the second angle indicates that the first tangent point D is closer to the first endpoint B of the arc segment, and in this case, the area of ​​the sound outlet 213 that is blocked is smaller.

[0106] In some embodiments, to ensure that the obstructed and / or unobstructed areas of the sound outlet 213 are of appropriate size to enhance the effect of the reflected field on sound reinforcement, the ratio of the first angle to the second angle can be within a range of 0.2-1.3. In some embodiments, to ensure that the obstructed and / or unobstructed areas of the sound outlet 213 are of appropriate size, the ratio of the first angle to the second angle is within a range of 0.5-1.0.

[0107] In some embodiments, to ensure that the arc length between the first tangent point D and the first endpoint B of the arc segment has an appropriate size, the first angle may be within a range of 15°-55°. In some embodiments, to ensure that the arc length between the first tangent point D and the first endpoint B of the arc segment has an appropriate size, the first angle may be within a range of 25°-45°.

[0108] In some embodiments, to ensure that the arc length between the first tangent point D and the second endpoint C of the arc segment has an appropriate size, the second angle is within a range of 40°-80°. In some embodiments, to ensure that the arc length between the first tangent point D and the second endpoint C of the arc segment has an appropriate size, the second angle is within a range of 50°-70°.

[0109] In some embodiments, the arc length of the arc segment of the sound outlet 213 (i.e., the arc length of arc BC) can affect whether a partial area of ​​the sound outlet 213 can be blocked or not blocked by the concha cavity wall, and the size of the blocked area or not blocked area.

[0110] In some embodiments, if the arc length of the arc segment is too small, the area blocked by the sound outlet 213 may be too small, or even not blocked at all. For example, when the arc length of the arc segment is too small, and the arc length between the first endpoint B and the first projection point A of the arc segment is large, the first tangent point D may be too close to the first endpoint B (i.e., the arc length between the first tangent point D and the first endpoint B is too small), resulting in the area blocked by the sound outlet 213 being too small; even worse, the first tangent point D may not be on the arc segment (e.g., the first tangent point D is located between the first endpoint B and the first projection point A), resulting in the sound outlet 213 not being blocked.

[0111] In some embodiments, if the arc length of the arc segment is too small, the unobstructed area of ​​the sound outlet 213 may be too small, or even completely obstructed. For example, when the arc length of the arc segment is too small, and the arc length between the second endpoint C of the arc segment and the first projection point A is small, the first tangent point D may be too close to the second endpoint C (i.e., the arc length between the first tangent point D and the second endpoint C is too small), resulting in the unobstructed area of ​​the sound outlet 213 being too small; even worse, the first tangent point D may not be on the arc segment (e.g., the first tangent point D is located on the side of the second endpoint C away from the first projection point A), resulting in the sound outlet 213 being completely obstructed.

[0112] In some embodiments, if the arc length of the arc segment is too long, the outer end surface of the sound outlet 213 will occupy a larger area of ​​the outer wall surface of the shell 211, which may affect the arrangement of other structures on the shell 211. For example, the shell 211 may also be provided with a pressure relief hole (such as the pressure relief hole 214). To ensure the acoustic performance of the ear clip-on headphone 200, the pressure relief hole may be away from the sound outlet 213. If the area occupied by the sound outlet 213 is large, it may affect the arrangement of the pressure relief hole or cause the distance between the pressure relief hole and the sound outlet 213 to be smaller. In addition, if the arc length of the sound outlet 213 is too long, the area of ​​the sound outlet 213 will be larger, which will affect the range of the resonant frequency of the front cavity of the ear clip-on headphone 200. For more information about the sound outlet 213 and the resonant frequency of the front cavity, please refer to other places in this specification, for example, Figures 7-8 and their related descriptions.

[0113] In some embodiments, to ensure that part of the sound hole 213 is blocked by the concha wall and part of it is not blocked, the arc length of the arc segment of the sound hole 213 can be greater than 5.2 mm. In some embodiments, to ensure the acoustic performance of the ear clip earphone 200 and to facilitate the arrangement of other structures on the housing 211, the arc length of the arc segment of the sound hole 213 can be less than 16.7 mm.

[0114] In some embodiments, to balance the need for the sound hole 213 to be partially obstructed by the concha wall and partially unobstructed, while ensuring the acoustic performance of the ear clip-on earphone 200, the arc length of the arc segment of the sound hole 213 can be within the range of 5.2 mm to 16.7 mm. In some embodiments, to balance the need for the sound hole 213 to be partially obstructed by the concha wall and partially unobstructed, while ensuring the acoustic performance of the ear clip-on earphone 200, the arc length of the arc segment of the sound hole 213 can be within the range of 7 mm to 15 mm. In some embodiments, the width of the sound hole 213 can be within the range of 1.4 mm to 2.2 mm to ensure that the sound hole 213 has an appropriate area range. The width of the sound hole 213 refers to the dimension of the outer end surface of the sound hole 213 in a direction perpendicular to the first plane of symmetry 300. For more information on the area of ​​the sound hole 213, please refer to Figures 7-8 and their related content.

[0115] In some embodiments, the ratio of the arc length of the arc segment of the sound outlet 213 to the length of the straight line segment between the first endpoint B and the second endpoint C of the arc segment (for ease of description, simply referred to as the arc segment's arc-chord ratio) can reflect the curvature of the arc segment. In some embodiments, the arc segment's arc-chord ratio affects the fit of the sound-emitting portion 210 and the cavum concha, thereby influencing whether the cavum concha wall can partially block the sound outlet 213 to enhance reflections. For example, if the arc segment's arc-chord ratio is too small and the arc segment's arc length is too large, it may be difficult for the sound-emitting portion 210 to reach the cavum concha and contact the cavum concha wall, resulting in a failure to enhance reflections. In some embodiments, the arc segment's arc-chord ratio affects the fit of the sound-emitting portion 210 and the cavum concha, thereby affecting the wearing stability of the ear clip earphone. For example, if the arc segment's arc segment's arc-chord ratio is too large, the ear structure may not effectively limit the sound-emitting portion 210, causing the sound-emitting portion 210 to shift or rotate during movement, affecting stability. Based on this, in some embodiments, in order to improve the degree of adaptation between the sound-emitting portion 210 and the concha cavity to form reflection enhancement, and to improve stability during wearing, the arc-to-chord ratio of the arc segment can be in the range of 1.05-1.4.

[0116] The outer end surface of the sound outlet 213 of the ear clip earphone 200 shown in FIG2 is symmetrical about the first plane of symmetry 300, that is, the sound outlet 213 is located centered on the housing 211. Unlike the arrangement of the sound outlet 213 in FIG2 , in some embodiments, the sound outlet 213 of the ear clip earphone 200 can be offset on the housing 211, that is, the outer end surface of the sound outlet 213 is asymmetrical about the first plane of symmetry 300. For example, the sound outlet 213 can be located on one side of the first plane of symmetry 300. When the ear clip earphone 200 is worn, the ear clip earphone 200 may tilt due to factors such as gravity or unstable wearing. By offsetting the sound outlet 213 on the housing 211, the tilt caused by gravity and other factors can be compensated for. This allows the unobstructed area of ​​the sound outlet 213 of the tilted ear clip earphone 200 to point toward the ear canal, thereby ensuring the best listening experience and volume.

[0117] In some embodiments, the sound outlet 213 may have an elongated outer end surface, which has a second symmetry plane parallel to the length extension direction of the sound outlet 213. An angle may be formed between the second symmetry plane of the sound outlet 213 and the first symmetry plane 300 of the ear hook 230. The size of this angle can affect the orientation of the sound outlet 213 relative to the ear canal opening in the wearing state. By setting the angle of this angle, the unobstructed area on the sound outlet 213 can point to the ear canal when the ear clip-type earphone 200 is tilted. In some embodiments, when the ear clip-type earphone 200 is in the wearing state, the ear clip-type earphone 200 is tilted due to factors such as gravity, and the tilt angle is generally between 0° and 30°. The tilt angle refers to the angle between the first symmetry plane 300 of the ear hook and the horizontal plane of the human body. In some embodiments, in order to ensure that the unobstructed area on the sound hole 213 can point to the ear canal when the ear clip earphone 200 is tilted, the angle between the second symmetry plane of the sound hole 213 and the first symmetry plane 300 of the ear hook 230 can be in the range of 15°-45°.

[0118] In some embodiments, referring to FIG2 , the ear clip-on earphone 200 may further include a pressure relief hole 214. The pressure relief hole 214 is located on the shell 211 of the sound-emitting portion 210. As shown in FIG2 , the pressure relief hole 214 is located on the side of the shell 211 near the ear hook 230 and facing the wearer's ear. In some embodiments, the pressure relief hole 214 is acoustically connected to the back cavity of the sound-emitting component, and the pressure relief hole 214 can guide the sound in the back cavity to the outside of the shell 211. The pressure relief hole 214 can be used to balance the pressure in the back cavity, so that the diaphragm of the sound-emitting component can fully vibrate at low frequencies and large amplitudes, thereby making the sound sound as good as possible with bass diving and treble penetrating.

[0119] In some embodiments, the sound generated by the front side of the sound driver radiates outward through the sound outlet, and the sound generated by the rear side of the sound driver radiates outward through the pressure relief hole. Since the sound generated by the front side of the sound driver and the sound generated by the rear side of the sound driver are equal in amplitude and opposite in phase, the sound radiated through the sound outlet and the sound radiated through the pressure relief hole are also roughly equal in amplitude and opposite in phase. When the two sounds are transmitted to the ear canal, they will cancel each other out in phase, reducing the volume heard by the wearer. In some embodiments, the pressure relief hole 214 can be farther away from the ear canal than the sound outlet 213 to reduce the anti-phase cancellation between the sound output through the pressure relief hole 214 and the sound output through the sound outlet 213 at the ear canal, thereby increasing the volume of the sound heard by the wearer.

[0120] Referring to FIG4A , the projection of the center of the pressure relief hole 214 onto the first plane of symmetry 300 forms a second projection point E. The distance between the second projection point E and the arc segment of the sound outlet hole 213 can reflect the distance between the pressure relief hole 214 and the sound outlet hole 213. The straight-line distance between the second projection point E and the first endpoint B of the arc segment is the shortest straight-line distance between the second projection point E and the arc segment. The shortest straight-line distance between the second projection point E and the arc segment can be used to measure the distance between the pressure relief hole 214 and the sound outlet hole 213.

[0121] In some embodiments, to ensure that the pressure relief hole 214 is as far away from the sound outlet hole 213 as possible, the shortest straight-line distance between the second projection point E of the center of the pressure relief hole 214 on the first symmetry plane 300 and the arc segment is within a range of 8.1 mm to 11 mm. In some embodiments, to ensure that the pressure relief hole 214 is as far away from the sound outlet hole 213 as possible, the shortest straight-line distance between the second projection point E of the center of the pressure relief hole 214 on the first symmetry plane 300 and the arc segment is within a range of 8.5 mm to 10.5 mm.

[0122] By setting the range of the shortest straight-line distance between the second projection point E and the arc segment, the pressure relief hole 214 can be positioned away from the sound outlet 213, thereby reducing the impact of the pressure relief hole 214 on the sound output of the sound outlet 213. This prevents the sound waves emitted by the pressure relief hole 214 from canceling out with the sound waves emitted by the sound outlet 213 in the near field, thereby affecting the user's listening volume. Furthermore, by setting the range of the shortest straight-line distance between the second projection point E and the arc segment, the sound outlet 213 and the pressure relief hole 214 can be separated by the helix when worn. The sound output from the pressure relief hole 214 needs to bypass the helix to reach the ear canal opening, further reducing the impact of the pressure relief hole 214 on the sound output of the sound outlet 213 and preventing sound short-circuiting.

[0123] It should be noted that since the sound outlet hole 213 and the pressure relief hole 214 are provided on the shell 211, each side wall of the shell 211 has a certain thickness. Therefore, the sound outlet hole 213 and the pressure relief hole 214 are holes with a certain depth. At this time, the sound outlet hole 213 and the pressure relief hole 214 may both have an inner opening and an outer opening. For the convenience of description, in the embodiment of this specification, the outer end face of the sound outlet hole 213 mentioned above and below may refer to the end face of the outer opening of the sound hole 213, and the center of the pressure relief hole 214 mentioned above and below may refer to the centroid of the outer opening of the pressure relief hole 214. For the convenience of description, in the embodiment of this specification, the area of ​​the sound outlet hole 213 hereinafter may refer to the area of ​​the outer opening of the sound hole 213, and the area of ​​the pressure relief hole 214 may refer to the area of ​​the outer opening of the pressure relief hole 214. It should be noted that, in some other embodiments, the area of ​​the sound hole 213 or the pressure relief hole 214 may also indicate other cross-sectional areas of the sound hole 213 or the pressure relief hole 214, such as the area of ​​the inner opening of the sound hole 213 or the pressure relief hole 214, or the average of the inner opening area and the outer opening area of ​​the sound hole 213 or the pressure relief hole 214.

[0124] In some embodiments, when the ear clip earphone 200 is worn, the characteristic point on the housing 211 and its surrounding area may be obscured by the concha wall. If the pressure relief hole 214 is close to the characteristic point, the concha may also obstruct the pressure relief hole 214, preventing the sound from the rear cavity of the sound-emitting component from being discharged outward through the pressure relief hole 214, thereby affecting the listening experience of the ear clip earphone 200. In some embodiments, to ensure that the pressure relief hole 214 is not obscured by the concha, the arc length between the second projection point E of the center of the pressure relief hole 214 on the first plane of symmetry 300 and the first projection point A of the characteristic point is no less than 7.5 mm.

[0125] In some embodiments, if the pressure relief hole 214 is far from the characteristic point, on the one hand, it may make the housing 211 larger, making it inconvenient to carry and store. On the other hand, it may also cause the pressure relief hole 214 to be too close to the connection between the housing 211 and the ear hook 230, where the structural design is relatively complex or complicated, making it inconvenient to install the pressure relief hole 214. To ensure that the pressure relief hole 214 is conveniently installed on the housing 211 and / or the size of the ear clip-on earphone 200 is appropriate, the arc length between the second projection point E of the center of the pressure relief hole 214 on the first symmetry plane 300 and the first projection point A of the characteristic point is no greater than 9.5 mm.

[0126] In some embodiments, in order to ensure that the pressure relief hole 214 is not blocked by the concha cavity and to facilitate the arrangement of the pressure relief hole 214 on the shell 211, the arc length between the second projection point E of the center of the pressure relief hole 214 on the first symmetry plane 300 and the first projection point A of the characteristic point is in the range of 7.5 mm-9.5 mm.

[0127] In some embodiments, the pressure relief hole 214 can be provided on the inner side of the ear hook 230 (i.e., the side facing the ear when worn). The arc structure near the location of the pressure relief hole 214 has a larger curvature, and this arc structure forms a "concave pit", thereby ensuring that the pressure relief hole 214 is not blocked by the ear when worn, thereby ensuring the pressure relief effect of the pressure relief hole 214. In some embodiments, a microphone hole can be provided on the side of the ear hook 230 opposite to the pressure relief hole 214. With this arrangement, when the ear clip-on earphone 200 is in the worn state, the microphone hole is located on the side of the ear hook 230 facing the tragus, thereby improving the sound reception effect of the ear clip-on earphone 200. At the same time, arranging the pressure relief hole 214 opposite to the microphone hole can also reduce mutual interference between the pressure relief hole 214 and the microphone hole.

[0128] Figure 4B is a schematic diagram of a projection of an ear clip-on headphone on a first symmetry plane according to some embodiments of this specification. Referring to Figure 4B , in some embodiments, the ear hook 230 forms a third projection 230' on the first symmetry plane 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 one side, which is closer to the helix when worn, and the outer contour curve corresponds to the contour of the ear hook 230 on the other side, which is farther away from the helix when worn. In some embodiments, the inner contour curve of the third projection 230' includes at least one point F that is farthest from the first projection point A. In some embodiments, when 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 used as the second feature point F. The second feature point F can be determined using tools, programs, etc. For example, by inputting the contour curve parameters of the ear-clip earphone 200 (such as the simulated curve function of the inner contour of the ear-clip earphone 200, the simulated curve function of the outer contour of the ear-clip earphone 200, etc.), the corresponding tools, programs, etc. can determine the information of the first projection point A, thereby outputting the information of the second feature point F (such as the position, etc.).

[0129] In some embodiments, when worn, point A is located near the contact point between the sound-producing portion 210 and the cavum conchae, and the helix is ​​located within the area enclosed by the inner contour of the earhook 230, substantially located in the area of ​​the inner contour of the earhook 230 farthest from point A. To ensure that the ear clip-on headphone 200 can bypass the user's tragus without squeezing or interfering with the tragus, the design of the first projection point A and the second feature point F allows the earhook 230 of the ear clip-on headphone 200 to bypass the ears of a larger proportion of users when worn, making the ear clip-on headphone 200 suitable for a wider range of users.

[0130] If the distance between the first projection point A and the second characteristic point F is too small, the ear hook 230 will squeeze and interfere with the ear helix of many users when worn, affecting wearing comfort and clamping effectiveness. If the distance between the first projection point A and the second characteristic point F is too large, the overall size of the ear hook 230 will be too large, and the ear clip-on earphone 200 may become unstable.

[0131] In some embodiments, in order to enable the ear hook 230 to bypass the ears of a larger proportion of users, and at the same time make the ear hook 230 of an appropriate size to avoid the problem of unstable clamping, 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 Figure 4B) can be 15mm-20mm.

[0132] The line connecting the first projection point A and the second characteristic point F is defined as the first line. A first auxiliary line L4 is drawn through the second characteristic point F toward the side of the first projection 211'. The first angle between the first auxiliary line L4 and the first line (i.e., line AF) has a first preset value range. The intersection point G of the inner contour curve of the third projection 230' and the first auxiliary line L4 can be defined as the fourth characteristic point. The line FG connecting the fourth characteristic point G and the second characteristic point F is the second line. The second line (i.e., line FG) is collinear with the first auxiliary line L4. The portion of the ear hook 230 corresponding to the second line FG (e.g., the portion corresponding to the arc FG segment) is disposed on the side of the second line FG away from the abutment portion 220 to prevent interference between the ear hook 230 and the antihelix and the helix.

[0133] In some embodiments, if the angle between the second line FG and the first line AF (i.e., ∠AFG) is too small, the inner contour of the ear hook 230 corresponding to the second line FG may interfere with the portion between the helix and the concha of the user's ear. If the angle between the second line FG and the first line AF is too large, the ear hook 230 may be too large, causing the sound-emitting portion 210 to interfere with the user's tragus or block the user's ear canal.

[0134] In some embodiments, in order to prevent the sound-emitting part 210 from blocking the user's ear canal opening and to prevent the sound-emitting part 210 from interfering with the tragus or antihelix or helix, the first preset value range can be 30°-40°, that is, the first angle between the second line FG and the first line AF can be 30°-41°.

[0135] In some embodiments, the inner contour curve portion of the third projection 230' corresponding to the second line FG (i.e., arc FG) has a first arc length. The ratio of the first arc length to the length of the second line FG can be defined as a first arc-chord ratio. The first arc-chord ratio can reflect the flatness of the arc FG corresponding to the second line FG. A larger first arc-chord ratio indicates a greater convexity of the arc FG corresponding to the second line FG, a larger area within the arc FG, and a lesser likelihood that the corresponding portion of the ear hook 230 will interfere with the portion of the ear extending from the helix to the cavum concha. A smaller first arc-chord ratio indicates a flatter arc FG corresponding to the second line FG, a smaller area within the arc FG, and a greater likelihood that the corresponding portion of the ear hook 230 will interfere with the portion of the ear extending from the helix to the cavum concha (e.g., the helix or anti-helix). In some embodiments, to prevent interference between the ear hook 230 and the helix or anti-helix, the first arc-chord ratio can be greater than 1.05.

[0136] If the first arc-chord ratio is too large, the ear hook 230 may be too large, resulting in an oversized ear clip headphone 200, which may affect the fit and reduce portability. In some embodiments, to ensure a suitable overall size for the ear clip headphone 200, the first arc-chord ratio may be less than 1.25. In some embodiments, to balance the overall size and fit of the ear clip headphone 200, the first arc-chord ratio is between 1.05 and 1.25.

[0137] On the inner contour curve of the third projection 230' and the contour of the first projection 211', with the fourth characteristic point G as the center, a second arc segment (e.g., arc GP1) and a third arc segment (e.g., arc GP2) are respectively determined on either side of point G. The arc lengths of the second arc segment (i.e., arc GP1) and the third arc segment (i.e., arc GP2) are both within a predetermined arc length range. The line connecting the end of the second arc segment (i.e., arc GP1) away from the fourth characteristic point G (i.e., point P1) and the end of the third arc segment (i.e., arc GP2) away from the fourth characteristic point E (i.e., point P2) (i.e., line P1P2) is defined as the third line. In some embodiments, the projection of the pressure relief hole 214 on the first plane of symmetry 300 can be located on the arc segment (i.e., arc P1P2) corresponding to the third line P1P2. In some embodiments, the ratio of the second arc length of arc P1P2 corresponding to the third line P1P2 to the length of the third line P1P2 is defined as the second arc-chord ratio. The larger the second arc-chord ratio, the greater the curvature of the corresponding arc P1P2, and the more concave the inner contour of the arc P1P2 near the connection between the sound-emitting portion 210 and the earhook 230. The smaller the second arc-chord ratio, the flatter the corresponding arc P1P2, and the less concave the inner contour of the arc P1P2 near the connection between the sound-emitting portion 210 and the earhook 230.

[0138] In some embodiments, since the projection of the pressure relief hole 214 on the first symmetry plane 300 is located on the arc P1P2, in order to avoid the pressure relief hole 214 being blocked by the auricle when worn, the curvature of the arc P1P2 should be greater than a certain threshold value, so that the inner contour near the connection position between the sound-emitting part 210 corresponding to the arc P1P2 and the ear hook 230 has a sufficient depression, so that the pressure relief hole 214 set at the depressed position can not be blocked by the auricle.

[0139] In some embodiments, to prevent the pressure relief hole 214 from being blocked by the auricle, the second arc-chord ratio is greater than 1.26. In some embodiments, to prevent the connection between the sound-emitting portion 210 and the ear hook 230 from being too thin, thereby affecting the connection strength, the recessed position should not be too deep. The second arc-chord ratio can be less than 1.44, that is, the second arc-chord ratio can be between 1.26 and 1.44.

[0140] 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 shield) disposed on one side of the first diaphragm along its 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 shield) disposed on one side of the second diaphragm along its vibration direction. A first sound transmission channel may be formed between the first diaphragm and the second diaphragm. The first sound transmission channel and the first magnetic circuit assembly are respectively located on either side of the first diaphragm along its vibration direction, with the first sound transmission channel acting as a front chamber of the first sound driver. Simultaneously, the first sound transmission channel and the second magnetic circuit assembly are also respectively located on either side of the second diaphragm along its vibration direction, with the first sound transmission channel also acting as a front chamber of the second sound driver. The first sound transmission channel serves as the front chamber of both the first and second sound drivers, and thus, the first sound transmission channel is a shared front chamber of the first and second sound drivers.

[0141] FIG5 is an exemplary structural diagram of a sound-emitting portion according to some embodiments of the present specification. Referring to FIG5 , in some embodiments, the sound-emitting component 212 may include a first sound driver 2121 and a second sound driver 2122. The first sound driver 2121 includes a first diaphragm 21211 and a first magnetic circuit component (e.g., a first magnet 21212 and a first magnetic conductive cover 21213 that are sequentially away from the first diaphragm 21211) disposed on one side of the first diaphragm 21211 along its vibration direction. The second sound driver 2122 includes a second diaphragm 21221 and a second magnetic circuit component (e.g., a second magnet 21222 and a second magnetic conductive cover 21223 that are sequentially away from the second diaphragm 21221) disposed on one side of the second diaphragm 21211 along its vibration direction.

[0142] In some embodiments, the first acoustic driver 2121 and the second acoustic driver 2122 are positioned opposite each other. This refers to the first diaphragm 21211 of the first acoustic driver 2121 and the second diaphragm 21221 of the second acoustic driver 2122 being positioned opposite each other. In some embodiments, the front side of the first diaphragm 21211 of the first acoustic driver 2121 and the front side of the second diaphragm 21221 of the second acoustic driver 2122 are positioned opposite each other. In this case, a first acoustic channel 400 can be formed between the first diaphragm 21211 and the second diaphragm 21221. The first acoustic channel 400 is located on the front side of the first diaphragm 21211 along its vibration direction (i.e., the side of the first diaphragm 21211 facing away from the first magnetic circuit assembly). The first magnetic circuit assembly is located on the rear side of the first diaphragm 21211 along its vibration direction (i.e., the side of the first diaphragm 21211 facing the first magnetic circuit assembly). In this case, the first acoustic channel 400 corresponds to the front cavity of the first acoustic driver 2121. At the same time, the first sound transmission channel 400 is located on the front side of the second diaphragm 21221 along its vibration direction (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 of the second diaphragm 21221 along its vibration direction (i.e., the side of the second diaphragm 21221 facing the second magnetic circuit assembly). In this case, the first sound transmission channel 400 also acts as the front cavity of the second acoustic driver 2122. The first sound transmission channel 400 serves as the front cavity of both the first acoustic driver 2121 and the second acoustic driver 2122. Therefore, the first sound transmission channel 400 is a shared front cavity for the first acoustic driver 2121 and the second acoustic driver 2122.

[0143] In some embodiments, the sound outlet 213 can be acoustically connected to the first sound transmission channel 400. The sound generated by the front side of the first diaphragm 21211 and the sound generated by the front side of the second diaphragm 21221 are radiated to the outside through the first sound transmission channel 400 and the sound outlet 213. When two sound drivers share a front cavity, the sound waves from the front cavities of the two sound drivers can be guided out of the housing of the sound-emitting unit through the same sound outlet, thereby simplifying the overall structure of the sound-emitting unit and reducing the manufacturing cost of the sound-emitting unit. In some embodiments, since the sound-emitting assembly 212 includes two sound drivers, the volume of the housing occupied by the two sound drivers may be larger. By providing a shared front cavity for the first sound driver 2121 and the second sound driver 2122, the volume occupied by the two sound drivers can be reduced, making it easier to install other structures (such as a battery) in the housing. In addition, when the two diaphragms work together, they have a greater impact on the sound pressure changes in the first sound transmission channel. When the cross-sectional area of ​​the sound outlet remains unchanged, the two sound drivers working together can increase the volume of the sound emitted from the sound outlet, thereby improving the sound quality.

[0144] In some embodiments, the first sound driver 2121 may include a first magnet 21212, a first magnetic shield 21213, and a first support frame for supporting the first diaphragm 21211. The first support frame is provided with a plurality of ventilation holes. The second sound driver 2122 includes a second magnet 21222, a second magnetic shield 21223, and a second support frame for supporting the second diaphragm 21221. The second support frame is provided with a plurality of ventilation holes.

[0145] The first magnetic shield 21213 has an open end and a closed end, with the open end of the first magnetic shield 21213 facing the first diaphragm 21211. The first magnet 21212 is located within the first magnetic shield 21213, and the 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 shield 21213. A first frame surrounds the first diaphragm 21211, and a first mounting hole is defined at the end of the first frame facing away from the first diaphragm 21211. The first magnetic shield 21213 passes through the first mounting hole, and the outer wall of the first magnetic shield 21213 is connected to the wall of the first mounting hole. The first frame, the first magnetic shield 21213, and the first diaphragm 21211 together form a cavity that serves as the back cavity of the first sound driver 2121. Similarly, the second magnetic shield 21223 has an open end and a closed end. The open end of the second magnetic shield 21223 is positioned toward the second diaphragm 21221. The second magnet 21222 is located within the second magnetic shield 21223, and the end of the second magnet 21222 facing away from the second diaphragm 21221 is connected to the inner wall of the closed end of the second magnetic shield 21223. A second frame surrounds the second diaphragm 21221. A second mounting hole is defined at the end of the second frame facing away from the second diaphragm 21221. The second magnetic shield 21223 passes through the second mounting hole, and the outer wall of the second magnetic shield 21223 is connected to the wall of the second mounting hole. The second frame, the second magnetic shield 21223, and the second diaphragm 21221 collectively form a cavity that serves as the back cavity of the second sound driver 2122.

[0146] Magnets (including the first magnet 21212 and the second magnet 21222) can be used to generate a magnetic field. When the intensity of the magnetic field generated by the magnet changes, the force on the corresponding diaphragm will change, causing the corresponding diaphragm to vibrate. When the diaphragm vibrates, it will drive the air in the first sound transmission channel 400 to vibrate, thereby generating sound waves. The magnetic shield can be used to suppress the leakage of magnetic circuit components (for example, magnets, etc.) of the sound driver. The basin frame is mainly used to support and fix the components of the sound driver (for example, magnets, magnetic shields).

[0147] In some embodiments, the materials used to make the first magnetic shield 21213 and the second magnetic shield 21223 may include one or a combination of low-carbon steel, silicon steel sheet, silicon steel sheet, and ferrite. In some embodiments, the first magnet 21212, the first magnetic shield 21213, and the first frame may be the same or similar to the second magnet 21222, the second magnetic shield 21223, and the second frame.

[0148] In some embodiments, the first frame and the first magnetic conductive cover 21213 can be connected by bonding, snap-fit ​​connection, welding, riveting, or the like. For example, the connection between the first frame and the first magnetic conductive cover 21213 can be secured with a sealant. The second frame and the second magnetic conductive cover 21223 can also be connected by the same or similar connection method as in the aforementioned embodiments.

[0149] In some embodiments, the first sound driver 2121 further includes a first magnetic conductive plate 21214 disposed within the first frame. The first magnetic conductive plate 21214 is connected to the side of the first magnet 21212 proximal to the first diaphragm 21211 and is configured to adjust the distribution of the magnetic field generated by the first magnet 21212. Similarly, the second sound driver 2122 further includes a second magnetic conductive plate 21224 disposed within the second frame. The second magnetic conductive plate 21224 is connected to the side of the second magnet 21222 proximal to the second diaphragm 21221 and is configured to adjust the distribution of the magnetic field generated by the second magnet 21222. In some embodiments, the first magnetic conductive plate 21214 and the second magnetic conductive plate 21224 can be identical or similar.

[0150] In some embodiments, the first sound driver 2121 further includes a first coil 21215 disposed within a first frame, the first coil 21215 being positioned around the sidewalls of the first magnet 21212. When current is applied to the first coil 21215 (e.g., via a solder pad on the first frame), the first coil 21215 can vibrate under the influence of the magnetic field, thereby driving the first diaphragm 21211 to vibrate. Similarly, the second sound driver 2122 further includes a second coil 21225 disposed within a second frame, the second coil 21225 being positioned around the sidewalls of the second magnet 21222. When current is applied to the second coil 21225 (e.g., via a solder pad on the second frame), the second coil 21225 can vibrate under the influence of the magnetic field, thereby driving the second diaphragm 2122 to vibrate. In some embodiments, the first coil 21215 and the second coil 21225 can be identical or similar.

[0151] In some embodiments, a second sound transmission channel can be formed between the first and second frames. The side of the first diaphragm 21211 facing away from the first sound transmission channel 400 communicates with the second sound transmission channel through an air vent in the first frame. The side of the second diaphragm 21221 facing away from the first sound transmission channel 400 communicates with the second sound transmission channel through an air vent in the second frame. By way of example only, 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 both have gaps with the inner wall of the housing 211. This allows a second sound transmission channel to be formed between the first and second frames, and the housing 211. The cavity near the end face of the first frame facing away from the first diaphragm 21211 and the cavity near the end face of the second frame facing away from the second diaphragm 21221 are acoustically connected. The side of the first diaphragm 21211 facing away from the first sound transmission channel 400, the first frame, and the first magnetic shield 21213 form the back cavity of the first sound driver 2121. The side of the second diaphragm 21221 facing away from the first sound transmission channel 400, the second frame, and the second magnetic shield 21223 form the rear cavity of the second sound driver 2122. The rear cavities of the first and second sound drivers 2121, 2122 can be acoustically connected to the second sound transmission channel through the ventilation holes in the first and second frames, respectively, effectively sharing the rear cavity of the first and second sound drivers 2121, 2122. In some embodiments, ventilation holes can also be provided on the magnetic shield. The first and second magnetic shields 21213, 21223 are each provided with multiple ventilation holes. The rear cavity of the first sound driver 2121 is acoustically connected to the second sound transmission channel through the ventilation holes in the first magnetic shield 21213, and the rear cavity of the second sound driver 2122 is acoustically connected to the second sound transmission channel through the ventilation holes in the second magnetic shield 21223. This arrangement can also achieve the same or similar effects as providing ventilation holes on the frame.

[0152] In some embodiments, the air vents on the two basins are acoustically connected to the pressure relief hole 214 on the shell 211. The rear cavity of the first sound driver 2121 and the rear cavity of the second sound driver 2122 are acoustically connected. The airflow in the rear cavities of the two sound drivers can be guided to the same pressure relief hole (for example, pressure relief hole 214) through the corresponding air vents, and then guided out of the shell 211 through the same pressure relief hole, thereby simplifying the overall structure of the sound-emitting part 210 and reducing the manufacturing cost of the sound-emitting part 210. In some embodiments, since the sound-emitting component 212 includes two sound drivers, this may cause the volume of the accommodating cavity occupied by the two sound drivers to be larger. By setting the first sound driver 2121 and the second sound driver 2122 to share the rear cavity, the volume occupied by the two sound drivers can be further reduced, making it easier to set other structures (such as batteries) in the accommodating cavity. In some embodiments, when the first sound driver 2121 and the second sound driver 2122 share the rear cavity, a waterproof and breathable membrane can be set on the sound outlet 213 and / or the second sound transmission channel. The waterproof and breathable membrane can ensure the sound quality of the ear clip type earphone 200 while playing the role of waterproof and dustproof, thereby increasing the reliability of the ear clip type earphone 200.

[0153] In some embodiments, when the sound-emitting portion 210 (or the sound-emitting portion 1410 hereinafter) includes two sound drivers, the diaphragms of the two sound drivers may be the same or similar. That is, the first diaphragm 21211 of the first sound driver 2121 and the second diaphragm 21221 of the second sound driver 2122 are the same or similar. The resonant frequency of the first diaphragm 21211 and the resonant frequency of the second diaphragm 21221 may both be lower than 300 Hz, and the difference between the resonant frequency of the first diaphragm 21211 and the resonant frequency of the second diaphragm 21221 may be less than 50 Hz. The resonant frequency of the diaphragm refers to the first resonant peak that appears in order from low to high frequency when the diaphragm is subjected to a frequency sweep process, corresponding to the position where the impedance curve of the diaphragm increases. It should be noted that, considering the acoustic characteristics of the dual diaphragms, the frequencies of the resonant peaks of the two diaphragms in the embodiment of this specification are both lower than 300 Hz, for example, 200 Hz to 300 Hz, which can better show the low-frequency part of the sound signal, thereby providing a better musical effect. In addition, when 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 can reduce the types of manufacturing materials, reduce costs and production difficulty.

[0154] Figure 6 is an exemplary structural diagram of the pressure relief hole shown in some embodiments of the present specification. Referring to Figure 6, in some embodiments, the pressure relief hole 214 can extend in a direction perpendicular to the first symmetry plane 300. For example, the outer end surface of the pressure relief hole 214 can be a strip structure, and the strip structure extends in a direction perpendicular to the first symmetry plane 300 (the direction perpendicular to the first symmetry plane 300 can be regarded as the length direction of the outer end surface of the pressure relief hole 214). In some embodiments, the air holes on the first basin frame and the air holes on the second basin frame can be respectively located on both sides of the first symmetry plane 300. For example, the air holes on the first basin frame are located on one side of the first symmetry plane 300, and the air holes on the second basin frame are located on the other side of the first symmetry plane 300.

[0155] In some embodiments, the two ends of the pressure relief hole 214 can extend to the air holes on the two basin frames. Specifically, the ends of the pressure relief hole 214 extend to the position where the center of the end is closest to the center of the nearest air hole. This arrangement ensures that the sound emitted from the air holes reaches the pressure relief hole 214 via the shortest path, and is then discharged to the outside of the housing 211.

[0156] In some embodiments, the outer end surface of the pressure relief hole 214 can be symmetrical about the first symmetry plane 300. As can be seen above, the sound-generating assembly 212 includes two sound drivers, and the sound-generating assembly 212 is symmetrically structured as a whole. For example, the first and second frames are both provided with air vents, and the sound in the rear chamber of the first sound driver and the sound in the rear chamber of the second sound driver are respectively directed to the pressure relief hole 214 through the corresponding air vents. By setting the outer end surface of the pressure relief hole 214 to be symmetrical about the first symmetry plane 300, the path of the sound in the rear chamber of the first sound driver through the air vents on the first frame to the pressure relief hole 214 can be equal or approximately equal to the path of the sound in the rear chamber of the second sound driver through the air vents on the second frame to the pressure relief hole 214, thereby ensuring that the amplitude or phase of the sound in the rear chamber of the first sound driver and the sound in the rear chamber of the second sound driver directed to the outside of the housing 211 through the pressure relief hole 214 are the same or substantially the same (or the amplitude and phase changes of the two sounds are substantially consistent).

[0157] In some embodiments, the two ends of the pressure relief hole 214 may have a larger opening size than the middle section of the pressure relief hole 214. When the two ends of the pressure relief hole 214 have a larger opening size than the middle section, the shape of the pressure relief hole 214 is similar to a "bone shape".

[0158] In some embodiments, the sound-emitting component 212 may include a mounting bracket, and the first sound driver 2121 and the second sound driver 2122 are mounted on the mounting bracket. For example, the first bracket is connected to the mounting bracket. The first magnetic plate 21214, the first magnet 21212, the first magnetic cover 21213, and the first diaphragm 21211 of the first sound driver 2121 are all connected to the mounting bracket via the first bracket. That is, the first sound driver 2121 is mounted on the mounting bracket via the first bracket. Similarly, the second bracket is connected to the mounting bracket. The second magnetic plate 21224, the second magnet 21222, the second magnetic cover 21223, and the second diaphragm 21221 of the second sound driver 2122 are all connected to the mounting bracket via the second bracket. That is, the second sound driver 2122 is mounted on the mounting bracket via the second bracket. In some cases, the first sound driver 2121 and the second sound driver 2122 are both mounted on the same mounting bracket. For example, the mounting bracket is mainly located between the first acoustic driver 2121 and the second acoustic driver 2122, and part of the structure on the mounting bracket can be enclosed together with the first acoustic driver 2121 and the second acoustic driver 2122 to form a first transmission channel cavity. In this way, the overall structure of the sound-emitting part 210 can be simplified and the manufacturing cost of the sound-emitting part 210 can be reduced. Moreover, the shared cavity of the first sound driver 2121 and the second sound driver 2122 can be adjusted only by designing the mounting bracket, thereby avoiding the influence of the complex structure in the shell 211 on the acoustic effect of the shared cavity. Based on the above-mentioned setting method of the mounting bracket, in some embodiments, the mounting bracket will block part of the middle section of the pressure relief hole 214 (i.e., the area on the pressure relief hole 214 except the two ends) (such as the area shown in the dotted box M in the figure), and the area on the pressure relief hole 214 blocked by the mounting bracket cannot output sound to the outside. By setting the two ends of the pressure relief hole 214 to have larger opening sizes than the middle section, the ends of the pressure relief hole 214 have larger opening sizes, so that the sound coming out of the air vent can be more smoothly discharged to the outside through the ends of the pressure relief hole 214.

[0159] In some embodiments, the first maximum distance between the pressure relief hole 214 and the air vent on the first basin frame (or the first magnetic cover 21213) and the second maximum distance between the pressure relief hole 214 and the air vent on the second basin frame (or the second magnetic cover 21223) can be the same or approximately the same. 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%. Under this setting, it can effectively avoid the distance between the air vent of one of the sound drivers and the pressure relief hole 214 being too large, thereby affecting the overall sound quality of the sound-emitting part 210. In some embodiments, the maximum distance (first maximum distance or second maximum distance) between the pressure relief hole 214 and the air vent (the air vent of the first sound driver 2121 or the air vent of the second sound driver 2122) can be less than 0.5 mm.

[0160] In some embodiments, the rear cavity of the sound-emitting portion 210 (the rear cavity of the first sound driver or the rear cavity of the second sound driver) has a first resonant frequency. Adjusting the area of ​​the pressure relief hole 214 can adjust the first resonant frequency. The front cavity of the sound-emitting portion 210 (the front cavity of the first sound driver or the front cavity of the second sound driver) has a second resonant frequency. Adjusting the area of ​​the sound outlet hole 213 can adjust the second resonant frequency.

[0161] FIG7 is a frequency response curve of the back cavity when the pressure relief holes have different areas according to some embodiments of this specification. The horizontal axis represents the frequency in Hz, and the vertical axis represents the sound pressure level in dB. The different curves in FIG7 represent the following conditions: under the condition that the area of ​​the sound outlet hole (such as the sound outlet hole 213) remains unchanged (for example, the area of ​​the sound outlet hole is 6mm). 2 ), the pressure relief hole (such as pressure relief hole 214) has different areas of the corresponding frequency response curve of the rear cavity. Curve 810 represents the pressure relief hole area of ​​1.5mm 2 Frequency response curve of the rear cavity; Curve 820 indicates that the pressure relief hole area is 3mm 2 Frequency response curve of the rear cavity; Curve 830 indicates that the pressure relief hole area is 4.5mm 2 Frequency response curve of the rear cavity; Curve 840 indicates that the pressure relief hole area is 6mm 2 Frequency response curve of the rear cavity; Curve 850 indicates that the pressure relief hole area is 7.5mm 2Frequency response curve of the rear cavity. As can be seen from Figure 7, each curve has two resonance peaks, and the two resonance peaks correspond to different resonance frequencies. Taking curve 810 as an example, curve 810 has a first resonance peak and a second resonance peak. The first resonance peak corresponds to a first resonance frequency f1 of approximately 3000Hz, and the second resonance peak corresponds to a second resonance frequency f2 of approximately 5900Hz. Comparing the various curves, it can be seen that the second resonance frequency corresponding to the second resonance peak of each curve is basically the same (approximately 5900Hz). This is because the area of ​​the sound outlet is the same. The area of ​​the sound outlet is the same, and the second resonance frequency of the front cavity is basically the same. Comparing the various curves, the magnitude relationship of the first resonance frequency corresponding to the first resonance peak of each curve is: the first resonance frequency of curve 810 < the first resonance frequency of curve 820 < the first resonance frequency of curve 830 < the first resonance frequency of curve 840 < the first resonance frequency of curve 850. It can be seen that within a certain range, as the area of ​​the pressure relief hole increases, the first resonance frequency corresponding to the first resonance peak of the curve gradually increases.

[0162] FIG8 is a frequency response curve corresponding to the front cavity when the sound outlet holes have different areas according to some embodiments of this specification. The horizontal axis represents the frequency in Hz; the vertical axis represents the sound pressure level in dB. The different curves in FIG8 represent the following conditions: under the condition that the area of ​​the pressure relief hole (such as the pressure relief hole 214) remains unchanged (for example, the area of ​​the pressure relief hole is 6mm). 2 ), the frequency response curve of the front cavity when the sound outlet (such as the sound outlet 213) has different areas. Curve 910 represents the sound outlet area of ​​3mm 2 Frequency response curve of the front cavity; Curve 920 indicates that the sound hole area is 4.5mm 2 Frequency response curve of the front cavity; Curve 930 indicates that the sound hole area is 6mm 2 Frequency response curve of the front cavity; Curve 940 indicates that the sound hole area is 7.5mm 2 Frequency response curve of the front cavity; Curve 950 indicates that the sound hole area is 9mm 2Frequency response curve of the front cavity. As can be seen from Figure 8, each curve has two resonance peaks, and the two resonance peaks correspond to different resonance frequencies. Taking curve 910 as an example, curve 910 has a first resonance peak and a second resonance peak. The first resonance peak corresponds to a first resonance frequency f1 of approximately 4400Hz, and the second resonance peak corresponds to a second resonance frequency f2 of approximately 4600Hz. Comparing the various curves, it can be seen that the first resonance frequency corresponding to the first resonance peak of each curve is basically the same (approximately 4200Hz). This is because the area of ​​the pressure relief hole is the same. The area of ​​the pressure relief hole is the same, and the first resonance frequency of the rear cavity is basically the same. Comparing the various curves, the magnitude relationship of the second resonance frequency corresponding to the second resonance peak of each curve is: the second resonance frequency of curve 910 < the second resonance frequency of curve 920 < the second resonance frequency of curve 930 < the second resonance frequency of curve 940 < the second resonance frequency of curve 950. It can be seen that within a certain range, as the area of ​​the sound outlet increases, the second resonance frequency corresponding to the second resonance peak of the curve gradually increases.

[0163] In some embodiments, the second resonant frequency of the front cavity is greater than the first resonant frequency of the rear cavity. When the second resonant frequency of the front cavity is significantly different from the first resonant frequency of the rear cavity, a trough will be formed between the corresponding second resonant peak and the first resonant peak, resulting in unsatisfactory sound in the mid- and high-frequency bands (for example, 3000Hz-5000Hz). Taking curve 810 in Figure 7 as an example, the first resonant frequency f1 corresponding to the first resonant peak is approximately 3000Hz, and the second resonant frequency f2 corresponding to the second resonant peak is approximately 5900Hz. The difference between the second resonant frequency and the first resonant frequency is approximately 1900Hz, and a large trough is formed between the two resonant peaks, resulting in a small sound pressure level in the frequency range around 4000Hz and unsatisfactory sound. When the second resonant frequency of the front cavity is significantly different from the first resonant frequency of the rear cavity, the distance between the corresponding second resonant peak and the first resonant peak is too small, or even overlaps, which causes the frequency response curve to drop too fast at high frequencies, resulting in a weak high-frequency response. Taking curve 910 in FIG8 as an example, 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. The difference between the second resonant frequency and the first resonant frequency is approximately 200 Hz. The distance between the two resonant peaks is too small, and in the frequency range above 4600 Hz, the rate of decline of curve 910 is too rapid, resulting in a weak high-frequency response of curve 910. Based on this, in some embodiments, the area of ​​the sound outlet and / or pressure relief vents can be adjusted to 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, thereby improving the output performance of the ear clip headphone 200 in the mid- and high-frequency ranges. 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 within the range of 0.5 kHz to 1.5 kHz. In some embodiments, the area of ​​the sound outlet and / or pressure relief vents can be adjusted to ensure that the difference between the second resonant frequency of the front cavity and the first resonant frequency of the rear cavity is within the range of 0.7 kHz to 1.3 kHz. In some embodiments, the area of ​​the sound outlet and / or the pressure relief hole can be adjusted so that the difference between the second resonant frequency of the front cavity and the first resonant frequency of the rear cavity is within the range of 0.9 KHz-1.1 KHz.

[0164] In some embodiments, by adjusting the area of ​​the pressure relief hole, the first resonant frequency of the rear cavity can be made higher than 4.5 kHz. Under this setting, on the one hand, it 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; on the other hand, it can also ensure that the frequency response curve is relatively smooth in the mid-low frequency range (such as 300 Hz-4.5 kHz) (or the smooth range of the frequency response curve is relatively large), so that the phase and amplitude of the sound output from the front cavity through the sound outlet 213 and the sound output from the rear cavity through the pressure relief hole 214 are relatively stable in the mid-low frequency range, such as the phase is approximately opposite and the amplitude is approximately equal, thereby strengthening the interference cancellation of the sound output through the pressure relief hole 214 and the sound output through the sound outlet 213 in the far field, and reducing the far-field sound leakage of the ear clip-on earphone 200.

[0165] In some embodiments, by adjusting the area of ​​the sound outlet, the second resonant frequency of the front cavity can be lowered to below 6 kHz. This arrangement ensures 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, while also ensuring that the earclip headphone 200 has good performance in the mid- and high-frequency ranges.

[0166] In some embodiments, in order to ensure that the second resonance frequency of the front cavity is lower than 6KHz, the area of ​​the sound outlet may not exceed 18mm. 2 In some embodiments, in order to ensure that the low-frequency volume is large enough, the area of ​​the sound hole can be no less than 5mm 2 In some embodiments, in order to take into account the second resonant frequency and low-frequency volume, the area of ​​the sound outlet can be located at 5mm 2 -18mm 2 In some embodiments, in order to take into account the second resonant frequency and low-frequency volume, the area of ​​the sound outlet can be located at 8mm 2 -16mm 2 within the range.

[0167] In some embodiments, the volume of the front cavity can affect the second resonant frequency. When the area of ​​the sound outlet is the same, the second resonant frequency is negatively correlated with the volume of the front cavity. Specifically, the larger the volume of the front cavity, the lower the second resonant frequency; the smaller the volume of the front cavity, the higher the second resonant frequency. In some embodiments, in order to ensure that the second resonant frequency is within an appropriate range, the volume of the front cavity can be within 60mm 3 -120mm 3 In some embodiments, in order to ensure that the second resonant frequency is within a suitable range and that the sound-emitting portion 210 has a suitable size, the volume of the front cavity can be within 80 mm. 3 -100mm 3 within the range.

[0168] In some embodiments, in order to ensure that the first resonant frequency of the rear cavity is higher than 4.5KHz, the area of ​​the pressure relief hole can be located at 6mm 2 -15mm 2 In some embodiments, the volume of the rear cavity can affect the first resonant frequency. When the area of ​​the pressure relief hole is the same, the first resonant frequency is negatively correlated with the volume of the rear cavity. Specifically, the larger the volume of the rear cavity, the lower the first resonant frequency; the smaller the volume of the rear cavity, the higher the first resonant frequency. In some embodiments, in order to ensure that the first resonant frequency is within a suitable range, the volume of the rear cavity can be within 80mm 3 -180mm 3 In some embodiments, in order to ensure that the first resonant frequency is within a suitable range and that the sound-emitting portion 210 has a suitable size, the volume of the back cavity can be within 100 mm. 3 -160mm 3 It should be noted that the area of ​​the pressure relief hole here may refer to the equivalent total area of ​​the pressure relief holes. For example, when there is only one pressure relief hole, the area of ​​the pressure relief hole here is the area of ​​one pressure relief hole; when there are multiple pressure relief holes, the area of ​​the pressure relief hole here is the sum of the areas of the multiple pressure relief holes.

[0169] Figure 9 is an exemplary structural diagram of a housing according to some embodiments of this specification. Referring to Figure 9 , the housing 211 may include a first rigid housing 2111, a second rigid housing 2112 positioned toward the wearer's cavum concha when worn, and a first flexible body 2113 configured to contact the wearer's cavum concha. In some embodiments, the rigid material may be plastic, metal, or other materials that can be used as support for an earphone housing to provide better support and stability for the internal structures of the housing 211 (such as the sound-producing components). In some embodiments, the first rigid housing 2111 and the second rigid housing 2112 enclose a housing 2114, within which the sound-producing components are located. The first flexible body 2113 covers the outer wall of the second rigid housing 2112. The first flexible body 2113 may be made of silicone or other skin-friendly, flexible materials to enhance the comfort of the sound-producing portion 211 when in contact with the wearer.

[0170] In some embodiments, the first hard shell 2111 and the second hard shell 2112 can provide better support to the internal structure. When worn, the second hard shell 2112 can face the wearer's cavum concha and come into contact with the wearer. In the embodiment of this specification, the first flexible body 2113 is covered on the outer wall of the second hard shell 2112 to improve wearing comfort of the earphones.

[0171] In some embodiments, the first flexible body 2113 covers the outer wall of the second rigid shell 2112. The first flexible body 2113 does not substantially affect the external structure and internal space of the first rigid shell 2111, thereby ensuring efficient utilization of the internal space of the first rigid shell 2111. Specifically, the first flexible body 2113 covers the outer wall of the second rigid shell 2112, so that the second rigid shell 2112 portion has a double-layer wall thickness. The outer wall of the shell 211 is not covered with the first flexible body 2113, or only a portion close to the first rigid shell 2111 is covered with the first flexible body 2113. Therefore, the first rigid shell 2111 only needs a single-layer wall thickness, which reduces the volume of the accommodating cavity 2114 occupied by the first rigid shell 2111, leaving more space for the sound-generating component, allowing for a sound-generating component with a larger vibrator (for example, a sound-generating component including two sound drivers) to achieve a better acoustic effect.

[0172] In some embodiments, the end of the second hard shell 2112 can be spliced ​​and fixed to the end of the first hard shell 2111. The end of the second hard shell 2112 is fixed to the end of the first hard shell 2111 by splicing to form a reliable and small-sized fixation. This splicing method also facilitates assembly and reduces the assembly process.

[0173] In some embodiments, the sound hole 213 can be located on the second rigid shell 2112 and the first flexible body 2113. By locating the sound hole 213 on the second rigid shell 2112 and the first flexible body 2113, the sound hole 213 does not extend into the first rigid shell 2111, facilitating the connection and fixation between the ends of the first rigid shell 2111 and the second rigid shell 2112, thereby improving precision. Furthermore, this arrangement prevents misalignment of the sound hole 213 and facilitates the installation of a steel mesh and a sound-tuning mesh over the sound hole 213.

[0174] Figure 10A is a schematic diagram of a free-field sound field according to some embodiments of the present disclosure. Figure 10B is a schematic diagram of a reflected-field sound field according to some embodiments of the present disclosure. The shades of gray in Figures 10A and 10B represent the sound pressure level. The greater the grayscale, the greater the sound pressure level; the lighter the grayscale, the lower the sound pressure level. In some embodiments, when the sound outlet is not blocked by the cavum concha, the sound field of the sound emitted by the sound outlet is a free-field sound field, as shown in Figure 10A. In some embodiments, when a sound outlet (such as sound outlet 213) is partially blocked by the cavum concha wall, the cavum concha wall forms a reflective surface in the direction of sound propagation near the sound propagation direction. This reflective surface reflects the sound, and the sound field of the sound emitted by the sound outlet is a reflected field sound field, as shown in Figure 10B. The reflected sound waves in the reflected field interfere with the source sound waves (i.e., the original sound waves emitted by sound outlet 213) and diffract to form a sound enhancement zone, thereby increasing the sound pressure level.

[0175] Figure 10C is a graph of the sound pressure levels of the free field and the reflected field according to some embodiments of the present specification. The horizontal axis represents the frequency in Hz, and the vertical axis represents the sound pressure level of the sound field in dB. Curve 1010 represents the sound pressure level curve of the free field, and curve 1020 represents the sound pressure level curve of the reflected field. By comparing curve 1010 and curve 1020, it can be seen that the sound pressure level of the reflected field is higher than the sound pressure level of the free field as a whole (it can also be understood that the average sound pressure level of the reflected field is higher than the average sound pressure level of the free field), especially in the low and medium frequency bands (for example, less than 4000Hz) and high frequency bands (for example, higher than 8000Hz). This phenomenon is also called the "horn effect".

[0176] FIG11A is a schematic diagram of the positional relationship between the sound-emitting part and the reflective wall surface according to some embodiments of the present specification. Referring to FIG11A , in some embodiments, the straight-line distance from the center of the sound-emitting part (such as the sound-emitting part 210) to the reflective wall surface can be defined as h, and the angle between the normal line from the center of the sound-emitting part to the outside and the straight line from the center of the sound-emitting part to the reflective wall surface is θ. The distance h reflects the distance between the sound-emitting part and the wall of the concha cavity in the wearing state, and the angle θ reflects the orientation of the sound-emitting hole of the sound-emitting part relative to the inner wall of the concha cavity in the wearing state. Different values ​​of the distance h / angle θ result in different sound pressure distributions in the reflected field.

[0177] Figure 11B is a graph of the sound pressure levels of the reflected field corresponding to different distances h, according to some embodiments of this specification. The different curves in Figure 11B represent the corresponding sound pressure level curves for distances h (denoted by h_gap in the figure) of 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm, and 20mm, respectively, under the condition of angle θ = 0°. Comparing the various curves, it can be seen that the smaller the distance h (i.e., the closer the sound-emitting portion is to the reflecting wall), the greater the sound pressure level at high frequencies. Corresponding to the structure of the ear clip earphone 200 described above, when the ear clip earphone 200 is worn, the outer surface of the housing 211 of the sound-emitting portion 210 abuts against the wall of the concha cavity, and the sound outlet 213 is at least partially obscured by the wall. This improves the volume of sound emitted by the ear clip earphone 200 through the sound outlet 213 and transmitted to the wearer's ear canal.

[0178] Figure 11C is a graph showing the sound pressure level of the reflected field corresponding to different angles θ according to some embodiments of this specification. The different curves in Figure 11C represent the sound pressure level curves corresponding to angles θ (denoted by 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 various curves, it can be seen that when the sound outlet points to the listening point (such as the ear canal opening) and the reflective wall (when worn), the sound pressure level of the sound transmitted to the listening point is higher.

[0179] Figure 12 is a graph of the sound pressure level of the reflection field corresponding to different distances h shown in some embodiments of this specification. The different curves in Figure 12 respectively represent the sound pressure level curves corresponding to the distances h of 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm and 20mm under the condition of an angle θ=300°. In some embodiments, when the angle θ is the same, the sound pressure level is maximum when the sound-emitting part is in contact with the reflection wall surface and the sound outlet is located on one side of the contact point (for example, the characteristic point on the shell 211 mentioned above). As shown in the solid line curve in Figure 12, when the distance h=5mm and the angle θ=300°, the sound-emitting part is in contact with the reflection wall surface and the sound outlet is completely located on one side of the contact point, and the sound pressure level is maximum at this time. Corresponding to the structure of the ear clip earphone 200 mentioned above, when the ear clip earphone 200 is in the wearing state, the outer surface of the shell 211 of the sound-emitting part 210 is in contact with the wall of the concha cavity, and the characteristic point (and its surrounding area) on the shell 211 will be blocked by the wall of the concha cavity. When the sound outlet 213 is completely located on one side of the characteristic point (for example, the arc BC in Figure 4A is completely located on one side of the first projection point A), it can be ensured that part of the sound outlet 213 is blocked by the wall of the concha cavity, and the unblocked area faces the wearer's ear canal opening, so that the wearer hears a louder volume of sound.

[0180] FIG13 is a graph of sound pressure level curves corresponding to the same frequency, the same distance h and different angles θ according to some embodiments of this specification. FIG13 (a)-(f) respectively represent the sound pressure level curves corresponding to the change of angle θ under the conditions of a frequency of 2000 Hz and a distance h = 5 mm (i.e., the sound-emitting part is in contact with the reflective wall). The angles θ corresponding to FIG13 (a)-(f) are 0°, 60°, 120°, 180°, 240°, and 300°, respectively. By comparing FIG13 (a)-(f), it can be seen that when the normal straight line pointing from the center of the sound-emitting part to the outside is obliquely pointed to the reflective wall (e.g., the angle θ is 60° or 300°), the maximum sound pressure level (the area of ​​the loud sound pressure level region is the largest) can be generated on one side, and the loud sound pressure level region on this side can be regarded as the listening position.

[0181] In conjunction with Figures 11A-13 , the distance h reflects the distance between the sound-emitting portion and the concha wall when worn, and the angle θ reflects the orientation of the sound-emitting portion's sound outlet relative to the concha wall when worn. Different distances h and / or angles θ result in different sound pressure distributions in the reflected field. Corresponding to the ear clip-on earphone 200 described above, when worn, different distances between the sound-emitting portion 210 of the ear clip-on earphone 200 and the concha wall, and / or different orientations of the sound outlet 213 of the sound-emitting portion 210 relative to the concha wall, result in different volumes of sound outputted from the ear clip-on earphone 200 through the sound outlet 213 and transmitted to the wearer's ear canal opening. When the outer surface of the shell 211 of the sound-emitting part 210 is in contact with the wall of the concha cavity, part of the sound outlet 213 is blocked by the wall of the concha cavity, and the sound outlet 213 is completely located on one side of the characteristic point on the shell 211, the reflection field formed by the sound field output through the sound outlet 213 can be stronger, thereby increasing the volume of the ear clip earphone 200 output through the sound outlet 213 and transmitted to the wearer's ear canal opening.

[0182] FIG14 is an exemplary structural diagram of another ear clip headphone according to some embodiments of the present disclosure. The structure of the ear clip headphone 1400 shown in FIG14 is substantially the same as that of the ear clip headphone 200. For example, the structures of the sound-emitting portion 1410, the abutting portion 1420, the ear hook 1430, the housing 1411, and the sound-emitting component 1412 (e.g., the first sound driver 14121, the first diaphragm 141211, the first magnet 141212, the first magnetic shield 141213, and the second sound driver 14122, the second diaphragm 141221, the second magnet 141222, and the second magnetic shield 141223) of the ear clip headphone 1400 are substantially the same as the corresponding structures of the ear clip headphone 200 (e.g., the sound-emitting portion 210, the abutting portion 220, the ear hook 230, the housing 211, and the sound-emitting component 212). The structure of the ear clip earphone 1400 differs from that of the ear clip earphone 200 in that the sound outlet 1413 is arranged differently from the sound outlet 213. It should be noted that this embodiment is described as an example in which the sound component 1412 includes two sound drivers. In other embodiments, the sound component 1412 may also include only one sound driver.

[0183] In some embodiments, the sound outlet 1413 of the ear clip earphone 1400 can have an elongated outer end surface with a second symmetry plane parallel to the longitudinal extension of the elongated shape. In some embodiments, the second symmetry plane can be perpendicular to the first symmetry plane 300 of the ear hook 1430. With this arrangement, when the ear clip earphone 1400 is worn, the sound outlet 1413 is less likely to be blocked by the concha cavity wall, thereby allowing more sound emitted through the sound outlet 1413 to reach the wearer's ear canal, improving the listening volume and listening experience.

[0184] In some embodiments, the sound outlet 1413 is acoustically connected to the front cavity of the sound-emitting portion 1410, directing the sound in the front cavity of the sound-emitting portion 1410 to the housing 1411. For example, when the sound-emitting assembly 1412 includes two sound drivers, a first acoustic channel 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. The first acoustic channel 1440 forms the front cavity, or a portion of the front cavity, of both sound drivers. The sound outlet 1413 is acoustically connected to the first acoustic channel 1440, and the sound generated by the front sides of both diaphragms is directed to the exterior of the housing 1411 through the first acoustic channel 1440 and the sound outlet 1413, and further transmitted to the listening position. Therefore, whether the sound outlet 1413 is blocked by the concha wall when worn can affect the volume heard by the wearer. For example, when the sound outlet 1413 is blocked by the wall of the concha cavity, the sound output through the sound outlet 1413 to the outside of the shell 1411 is smaller, and the listening volume heard by the wearer is smaller; when the sound outlet 1413 is not blocked by the wall of the concha cavity, the sound output through the sound outlet 1413 to the outside of the shell 1411 is larger, and the listening volume heard by the wearer is larger.

[0185] To ensure that the sound outlet 1413 is not blocked by the concha wall when worn, thereby improving the wearer's listening volume, in some embodiments, the position of the sound outlet 1413 on the housing 1411 can be adjusted. In conjunction with the foregoing description, portions of the housing 1411 closer to a characteristic point on the housing 1411 can be blocked by the concha wall, while portions of the housing 1411 farther from the characteristic point on the housing 1411 are not blocked by the concha wall. Therefore, to ensure that the sound outlet 1413 is not blocked by the concha wall, the straight-line distance between the center of the projection of the outer end surface of the sound outlet 1413 onto the first symmetry plane 300 and the first projection point (e.g., first projection point A) formed by the projection of the characteristic point on the housing 1411 onto the first symmetry plane 300 can 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 outlet 1413 onto the first symmetry plane 300 refers to the centroid of the projection shape formed by the outer end surface of the sound outlet 1413 onto the first symmetry plane 300.

[0186] Figure 15 is an exemplary structural diagram of a sound-emitting portion according to some embodiments of the present specification. In some embodiments, as shown in Figure 15 , when the straight-line distance between the center of the projection of the outer end surface of the sound outlet 1413 on the first symmetry plane 300 and the first projection point (e.g., first projection point A) is shortest, the sound outlet 1413 may be located at the first extreme position 1413b on the housing 1411. When the straight-line distance between the center of the projection of the outer end surface of the sound outlet 1413 on the first symmetry plane 300 and the first projection point (e.g., first projection point A) is longest, the sound outlet 1413 may be located at the second extreme position 1413a on the housing 1411.

[0187] In some embodiments, when the sound-emitting assembly 1412 includes two sound drivers, since the sound outlet 1413 is acoustically connected to the first sound transmission channel 1440, the extension direction of the first sound transmission channel 1440 varies depending on the position of the sound outlet 1413 on the housing 1411. This means that the orientation / angle of the sound-emitting assembly 1412 (or diaphragm) within the housing cavity varies. In some embodiments, the orientation / angle of the sound-emitting assembly 1412 within the housing cavity is adjustable (which can also be understood as the sound-emitting assembly 1412 being rotatable relative to the housing 1411). As an example, the orientation / angle of the sound-emitting assembly 1412 within the housing cavity can be represented by the angle between the symmetry plane of the sound-emitting assembly 1412 and the horizontal plane when worn. The symmetry plane of the sound-emitting assembly 1412 refers to the symmetry plane between the first diaphragm 141211 and the second diaphragm 141221. The first sound driver 14121 and the second sound driver 14122 are located on either side of the symmetry plane of the sound-emitting assembly 1412, respectively. It should be noted that no matter how the direction / angle of the sound-emitting component 1412 in the accommodating cavity changes, the symmetry plane of the sound-emitting component 1412 and the first symmetry plane 300 of the ear hook 1430 are always perpendicular.

[0188] By adjusting the direction / angle of the sound-emitting component 1412 in the accommodating cavity, the position of the sound hole 1413 on the shell 1411 can be adjusted, thereby ensuring that the sound hole 1413 is not blocked by the wall of the concha cavity when worn, thereby increasing the listening volume heard by the wearer.

[0189] In some embodiments, the sound hole 1413 has a central axis. When the outer end surface of the sound hole 1413 is elongated, the outer end surface has four vertices, forming two diagonal lines. The axis passing through the intersection of the two diagonal lines of the elongated outer end surface and perpendicular to the outer end surface is the central axis of the sound hole 1413. In some embodiments, when the sound-emitting assembly 1412 includes two sound drivers, the central axis of the sound hole 1413 is located on the symmetric plane between the first diaphragm 141211 and the second diaphragm 141221.

[0190] In some embodiments, the central axis of the sound outlet 1413 can be located on the first symmetry plane 300 of the ear hook 1430. In this case, along the length of the outer end surface of the sound outlet 1413, the first symmetry plane 300 divides the outer end surface of the sound outlet 1413 into two symmetrical or nearly symmetrical parts. With this arrangement, the sound outlet 1413 can be centrally located on the bottom surface of the housing 1411, so that the sound outlet 1413 can point toward the wearer's ear canal when worn.

[0191] In some embodiments, the central axis of the sound outlet 1413 may also deviate from the first symmetry plane 300. In this case, along the length extension direction of the outer end surface of the sound outlet 1413, the outer end surface of the sound outlet 1413 is asymmetric with respect to the first symmetry plane. When the ear clip-on earphone 1400 is worn, the ear clip-on earphone 1400 may be tilted due to factors such as gravity or unstable wearing. By setting the central axis of the sound outlet 1413 to deviate from the first symmetry plane 300, the tilt of the ear clip-on earphone 1400 caused by factors such as gravity when worn can be compensated, so that the sound outlet 1413 of the tilted ear clip-on earphone 1400 can point to the ear canal, thereby ensuring the listening effect and listening volume.

[0192] In some embodiments, when the ear clip earphone 1400 is worn, the tilt angle (hereinafter referred to as angle β) caused by factors such as gravity causes the ear clip earphone 1400 to tilt, typically ranging from 0° to 30°. In some embodiments, to ensure that the sound outlet 1413 points toward the ear canal when the ear clip earphone 1400 is tilted, the angle formed between the central axis of the sound outlet 1413 and the first plane of symmetry 300 (hereinafter referred to as angle α) can be within a range of 15° to 45°.

[0193] In some embodiments, the sound hole 1413 can be located on the first hard shell 2111. By placing the sound hole 1413 on the first hard shell 2111, the sound hole 1413 does not extend to the second hard shell 2112, facilitating the connection and fixation between the ends of the first hard shell 2111 and the second hard shell 2112, thereby improving precision. Furthermore, this arrangement prevents misalignment of the sound hole 1413 and facilitates the installation of a steel mesh and a sound-tuning mesh over the sound hole 1413.

[0194] In some embodiments, the ear clip-on headphone 1400 may include two pressure relief holes (not shown), both located on the housing 1411 of the sound-emitting portion 1410. In some embodiments, both pressure relief holes may be located on the first hard shell of the housing 1411. This arrangement ensures that the two pressure relief holes are farther away from the sound outlet 1413, thereby reducing the impact of the sound output from the two pressure relief holes on the volume of the sound output from the sound outlet 1413 at the listening position. In other alternative embodiments, the two pressure relief holes may also be located on the first hard shell and the second hard shell, respectively.

[0195] In some embodiments, the acoustic holes (e.g., sound holes, pressure relief holes, microphone holes, ventilation holes, etc.) provided on an ear clip-on headset (e.g., ear clip-on headset 200, ear clip-on headset 1400) can be fully symmetrical. Taking the structure of ear clip-on headset 1400 as an example, the central axis of the sound hole 1413 of ear clip-on headset 1400 can be located on the first symmetry plane 300 of the ear hook 1430. In this case, along the length of the outer end surface of the sound hole 1413, the first symmetry plane 300 divides the outer end surface of the sound hole 1413 into two symmetrical or nearly symmetrical parts. When the ear clip headphone 1400 includes two pressure relief holes, the two pressure relief holes can be symmetrically arranged about the first symmetry plane 300. On the one hand, by isolating the back cavity of the first sound driver 2121 from the back cavity of the second sound driver 2122, the sound signals output by the two sound drivers can be made inconsistent, thereby enabling the ear clip headphone 1400 to have a certain frequency division function. On the other hand, by isolating the back cavity of the first sound driver 2121 from the back cavity of the second sound driver 2122, mutual interference between the two sound drivers can be reduced. In addition, other acoustic holes provided on the ear clip headphone 1400, such as the air vents and the microphone hole, can also be symmetrically arranged about the first symmetry plane 300 to ensure that the acoustic holes on the ear clip headphone 1400 are fully symmetrical.

[0196] As can be seen from the above, when the second symmetry plane of the sound hole 1413 is perpendicular to the first symmetry plane 300 of the ear hook 1430, the output volume of the ear clip earphone 1400 at the wearer's ear canal opening can be adjusted by adjusting the position of the sound hole 1413 on the shell 1411.

[0197] Figure 16 is a schematic diagram of the sound hole placement and wearing state according to some embodiments of this specification. Figure 17 is a schematic diagram of the wearing state at different β angles according to some embodiments of this specification. Figure 18 is a frequency response curve at the ear canal opening corresponding to different β angles when α is 0 according to some embodiments of this specification. Figure 19 is a frequency response curve at the ear canal opening corresponding to different α angles when β is 0 according to some embodiments of this specification.

[0198] Referring to Figures 16 and 17 , when the second symmetry plane of the sound outlet (e.g., sound outlet 1413) is perpendicular to the first symmetry plane (e.g., first symmetry plane 300) of the ear hook (e.g., ear hook 1430), the angle between the normal line W of the sound outlet pointing outward from the sound-emitting portion and the first symmetry plane 300 of the ear hook can be defined as α, and the angle between the first symmetry plane 300 of the ear hook and the horizontal plane of the human body can be defined as β. As shown in Figure 18 , the abscissa represents the frequency (Hz) of the ear clip headphone, and the ordinate represents the measured sound pressure level (dB). By fixing α (denoted by alpha in the figure) to 0° (i.e., the center axis of the sound outlet is located on the first symmetry plane of the ear hook), and adjusting β (denoted by beta in the figure) to -20°, 0°, and 45°, the frequency response curve of the sound output from the ear clip headphone at the ear canal opening was measured. As shown in Figure 18 , when α = 0° and β is -20°, the sound pressure level of the measured frequency response curve of the ear clip headphone is the highest.

[0199] Further, referring to Figure 19 , with β fixed at 0° (i.e., the earhook's first plane of symmetry is parallel to the body's horizontal plane), the α angle was adjusted to -30°, -15°, 0°, 15°, 30°, 45°, and 60°, respectively, to measure the frequency response curve of the earphone output sound at the ear canal opening. As can be seen from Figure 19 , when α is within the range of 15°-45°, the measured sound pressure level of the earclip headphone frequency response curve is the highest, indicating the maximum output volume.

[0200] In addition, when the ear clip earphones are worn, the angle β is usually between 0° and 30° due to the influence of gravity. Therefore, when the sound outlet is set to β = 0° (i.e., the wearing state in which the first symmetry plane of the ear hook is parallel to the horizontal plane of the human body), the angle α between the normal line of the sound outlet and the first symmetry plane of the ear hook is in the range of 15°-45°. This can increase the listening volume in the wearing scenario in which β is between 0° and 30°. Corresponding to the structure of the ear clip earphones 1400 mentioned above, that is, the sound outlet 1413 is offset on the shell 1411, which can compensate for the tilt of the ear clip earphones 1400 caused by factors such as gravity when worn, so that the sound outlet 1413 of the tilted ear clip earphones 1400 can point to the ear canal, thereby ensuring the listening effect and listening volume.

[0201] The basic concepts have been described above. It will be apparent to those skilled in the art that the detailed disclosure above is merely illustrative and does not limit the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to the present application. Such modifications, improvements, and amendments are suggested in the present application and remain within the spirit and scope of the exemplary embodiments of the present application.

Claims

1. An ear clip type earphone, comprising: The sound-generating part is configured to be located in the concha cavity of the wearer and to contact the inner wall of the concha cavity, and the sound-generating part includes: A housing, wherein the housing forms a receiving cavity; A sound-generating component, contained in the accommodating cavity; a sound outlet hole, located on the housing, the sound outlet hole being configured to guide out the sound generated by the sound-generating component, wherein a portion of the sound outlet hole is blocked by the concha cavity wall; an abutment portion configured to abut behind an ear of the wearer; and The ear hook is configured to bypass the anti-helix and the auricle of the wearer and connect the sound-emitting part and the abutting part.

2. The ear-clip headphone according to claim 1, wherein: The ear hook has a first symmetric plane, the outer end surface of the sound outlet is projected on the first symmetric plane to form an arc segment, the projection of the shell on the first symmetric plane has an arc-shaped outer contour, and at least part of the arc-shaped outer contour overlaps with the arc segment.

3. The ear-clip headphone according to claim 2, wherein: The shell has a characteristic point that is in contact with the abutting portion or is closest to the abutting portion, and the characteristic point is projected on the first symmetry plane to form a first projection point. The arc length between the endpoint of the two endpoints of the arc segment that is closer to the first projection point and the first projection point is in the range of 1.7mm-4.5mm.

4. The ear-clip headphone according to claim 3, wherein: The arc length between the first projection point and the endpoint of the arc segment that is farther from the first projection point is within the range of 12 mm to 15.5 mm.

5. The ear-clip headphone according to claim 2, wherein: The shell is projected on the first symmetry plane to form a first projection, and the abutment portion is projected on the first symmetry plane to form a second projection. The tangent line tangent to the lower end point of the first projection and the lower end point of the second projection is a common tangent line, and the first tangent point of the common tangent line and the first projection is located on the arc segment.

6. The ear-clip headphone according to claim 5, wherein: The ratio of the arc length between the first endpoint of the arc segment and the first tangent point to the arc length between the second endpoint of the arc segment and the first tangent point is in the range of 0.5-0.85, the first endpoint is the endpoint of the two endpoints of the arc segment that is closer to the first projection point, and the second endpoint is the endpoint of the two endpoints of the arc segment that is farther from the first projection point, wherein the second endpoint of the arc segment is closer to the ear hole.

7. The ear-clip headphone according to claim 5, wherein: The normal at the first tangent point intersects with the normal at the first endpoint or the second endpoint of the arc segment at the center point, the line connecting the first endpoint and the center point forms a first angle with the line connecting the first tangent point and the center point, the line connecting the second endpoint and the center point forms a second angle with the line connecting the first tangent point and the center point, and the ratio of the first angle to the second angle is in the range of 0.2-1.

3.

8. The ear clip type earphone according to claim 7, wherein: The first angle is in the range of 15°-55°.

9. The ear clip type earphone according to claim 7, wherein: The second angle is in the range of 40°-80°.

10. The ear clip type earphone according to claim 2, wherein: The arc length of the arc segment is in the range of 5.2 mm to 16.7 mm, and the width of the sound outlet hole is in the range of 1.4 mm to 2.2 mm.

11. The ear-clip headphone 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 1.05-1.

4.

12. The ear clip type earphone according to claim 1, wherein: The ear hook has a first symmetric plane, and the sound outlet is located on one side of the first symmetric plane.

13. The ear clip type earphone according to claim 12, wherein: The sound outlet has an elongated outer end surface, the outer end surface has a second symmetry plane parallel to the length extension direction of the outer end surface, and the angle between the first symmetry plane and the second symmetry plane is in the range of 15°-45°.

14. The ear clip type earphone according to claim 2 or 12, wherein: The outer end surface of the sound outlet is projected onto the first symmetry plane to form an arc segment. The ear clip earphone also includes a pressure relief hole. The shortest straight-line distance between the projection point of the center of the pressure relief hole on the first symmetry plane and the arc segment is in the range of 8.1mm-11mm.

15. The ear clip type earphone according to claim 2 or 12, wherein: The shell has a feature point that is in contact with the abutting portion or is closest to the abutting portion, and the feature point is projected on the first symmetry plane to form a first projection point. The ear-clip earphone also includes a pressure relief hole, and the arc length between the projection point of the center of the pressure relief hole on the first symmetry plane and the first projection point is in the range of 7.5mm-9.5mm.

16. The ear clip type headphone according to claim 1, wherein: The ear hook has a first symmetric plane, the sound outlet has an elongated outer end surface, the outer end surface has a second symmetric plane parallel to the length extension direction of the outer end surface, and the second symmetric plane is perpendicular to the first symmetric plane.

17. The ear clip type earphone according to claim 16, wherein: The sound outlet has a central axis, and the central axis is located on the first symmetry plane.

18. The ear clip type earphone according to claim 17, wherein: The ear-clip earphone further includes two pressure relief holes, and the two pressure relief holes are symmetrically arranged with respect to the first symmetry plane.

19. The ear clip type earphone according to claim 16, wherein: The sound outlet hole has a central axis, and the central axis deviates from the first symmetry plane.

20. The ear clip type headphone according to claim 16, wherein: The shell has a characteristic point that is in contact with the abutting portion or is closest to the abutting portion, and the characteristic point is projected on the first symmetry plane to form a first projection point; the straight-line distance between the center of the projection of the outer end surface of the sound outlet on the first symmetry plane and the first projection point is in the range of 7.0mm-8.5mm.

21. The ear clip type earphone according to any one of claims 14 to 16, wherein: The sound-emitting component includes two sound drivers, a first sound transmission channel is formed between the diaphragms of the two sound drivers, the sound outlet is acoustically connected to the first sound transmission channel, and the first sound transmission channel forms the front cavity or a part of the front cavity of the two sound drivers.

22. The ear-clip headphone according to claim 21, wherein: Each of the sound drivers includes a magnet and a magnetic cover that are sequentially away from its corresponding diaphragm, and a basin for support; the basin and / or the magnetic cover are provided with a plurality of air holes, and a second sound transmission channel is formed between the two basins, and the back sides of the two diaphragms are acoustically connected to the second sound transmission channel through the air holes on the basin, and the second sound transmission channel forms the back cavity or a part of the back cavity of the two sound drivers.

23. The ear-clip headphone according to claim 22, wherein: The difference between the resonance frequency of the front cavity and the resonance frequency of the rear cavity is in the range of 0.5 KHz-1.5 KHz.

24. The ear clip headphone according to claim 23, wherein: The resonant frequency of the front cavity is lower than 6KHz.

25. The ear clip headphone according to claim 23, wherein: The resonant frequency of the rear cavity is higher than 4.5 KHz.

26. The ear clip headphone according to claim 23, wherein: The area of ​​the sound outlet is 5mm 2 -18mm 2 within the range.

27. The ear clip headphone according to claim 26, wherein: The volume of the front cavity is located at 60mm 3 -120mm 3 within the range.

28. The ear clip headphone according to claim 23, wherein: The area of ​​the pressure relief hole is 6mm 2 -15mm 2 within the range.

29. The ear-clip headphone according to claim 28, wherein: The volume of the rear cavity is located at 80mm 3 -180mm 3 within the range.

30. The ear clip headphone according to claim 22, wherein: The air holes on the two basin frames are respectively located on both sides of the first symmetry plane, and the pressure relief holes extend in a direction perpendicular to the first symmetry plane.

31. The ear-clip headphone according to claim 30, wherein: The two ends of the pressure relief hole extend to the air holes on the two basin frames respectively.

32. The ear-clip headphone according to claim 31, wherein: The two ends of the pressure relief hole have larger opening sizes than the middle section of the pressure relief hole.

33. The ear clip headphone according to claim 1, wherein: The shell includes a first hard shell, a second hard shell and a first flexible body for contacting the wearer's concha cavity, the first hard shell and the second hard shell enclose the accommodating cavity; the first flexible body covers the outer wall of the second hard shell; the sound outlet is located on the second hard shell and the first flexible body.

34. The ear clip headphone according to claim 1, wherein: The ear hook has a first symmetry plane, and the shell has a feature point that is in contact with the abutting portion or is closest to the abutting portion. The feature point is projected on the first symmetry plane to form a first projection point. The ear hook is projected on the first symmetry plane to form a third projection, and the third projection includes an inner contour curve. The point on the inner contour curve that is farthest from the first projection point is used as the second feature point. The distance between the first projection point and the second feature point is 15mm-20mm.

35. The ear-clip headphone according to claim 34, wherein: The shell is projected on the first symmetry plane to form a first projection, and the line connecting the first projection point and the second feature point is defined as a first line. A first auxiliary line is made through the second feature point to the side biased towards the first projection, and the angle between the first auxiliary line and the first line has a first preset value range. The intersection of the curve segment on the inner contour curve connected to the first projection and the first auxiliary line is defined as a fourth feature point, and the line connecting the fourth feature point and the second feature point is defined as a second line. The first preset value range is 30°-41°.

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

25.

37. The ear clip headphone according to claim 35, wherein: With the fourth characteristic point as the center, the second arc segment and the third arc segment are respectively determined on both sides of the fourth characteristic point, the arc length of the second arc segment and the arc length of the third arc segment are both within a preset arc length range, the line connecting the end of the second arc segment away from the fourth characteristic point and the end of the third arc segment away from the fourth characteristic point is defined as a third line, the arc segment corresponding to the third line has a second arc length, the preset arc length range is 2.5mm-3.5mm, the ratio of the second arc length to the length of the third line is defined as a second arc chord ratio, and the second arc chord ratio is 1.26-1.

44.

38. The ear clip headphone according to claim 37, wherein: The ear-clip earphone further includes a pressure relief hole, and a projection of the pressure relief hole on the first symmetry plane is located on an arc segment corresponding to the third connecting line.

Images