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, and the sound outlet hole is configured to lead out the sound generated by the sound production assembly; the abutting part is configured to abut against the back of the ear of the wearer; 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, and the ear hook is provided with a first symmetric surface; the shell is provided with a feature point which is in contact with the abutting part or is closest to the abutting part, the feature point is projected on the first symmetric plane to form a first projection point, and the ear clip type earphone further comprises a pressure relief hole; 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 within the range of 7.5 mm-9.5 mm.

Description

[0001] This application is a divisional application of a Chinese patent application with the application number 202410172094.4, filed on February 6, 2024, and the invention title of "A Clamp-on Earphone". This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on December 11, 2023, with the application number CN202311701969.7 and the invention title of "Clamp-on Earphone". Technical Field This application relates to the field of sound generating devices, and more particularly to a clamp-on earphone.

[0002] Background Art

[0003] With the development of acoustic output technology, acoustic devices (such as earphones) have been widely used in people's daily lives and can be used in conjunction with electronic devices such as mobile phones and computers to provide sound playback for users. Clamp-on earphones are a new type of earphone. They are usually small in size, can be clamped on the wearer's ear helix for use, and do not block the ear canal. They can not only ensure safety in outdoor scenarios but also provide better wearing comfort compared to in-ear earphones. However, due to their small size, clamp-on earphones have problems such as insufficient volume and room for improvement in sound quality.

[0004] Therefore, it is necessary to propose a clamp-on earphone to improve the output performance of clamp-on earphones.

[0005] Summary of the Invention Embodiments of this specification provide a clamp-on earphone, including: a sound generating part configured to be located in the wearer's concha and in contact with the inner wall of the concha. The sound generating part includes: a housing forming a receiving cavity; a sound generating component received in the receiving cavity; a sound outlet hole located on the housing, and the sound outlet hole is configured to conduct the sound generated by the sound generating component; a contact part configured to contact the back of the wearer's ear; and an ear hook configured to bypass the wearer's antitragus and helix to connect the sound generating part and the contact part. The ear hook has a first symmetry plane; there is a feature point on the housing that is in contact with the contact part or is the closest to the contact part. The feature point forms a first projection point when projected onto the first symmetry plane. The clamp-on earphone further 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 7.5 mm - 9.5 mm. In some embodiments, the pressure relief hole extends in a direction perpendicular to the first symmetry plane.

[0006] ​​​​​​​​​

[0007] In some embodiments, the outer end face of the pressure relief hole is symmetric about the first symmetry plane.

[0008] In some embodiments, the housing includes a first rigid housing and a second rigid housing. The first rigid housing and the second rigid housing enclose to form a receiving cavity. The first rigid housing is connected to the earhook. The second rigid housing faces the wearer's concha cavity. The sound outlet hole is provided on the first rigid housing, and the sound outlet hole does not extend to the second rigid housing.

[0009] In some embodiments, the sound outlet hole has an oblong outer end face. The outer end face has a second symmetry plane parallel to the length extension direction of the outer end face. The second symmetry plane is perpendicular or nearly perpendicular to the first symmetry plane.

[0010] In some embodiments, the sound outlet hole is located on one side of the first symmetry plane.

[0011] In some embodiments, the sound outlet hole has a central axis, and the central axis deviates from the first symmetry plane.

[0012] In some embodiments, in the worn state, the included angle formed between the first symmetry plane and the wearer's human horizontal plane is between 0° - 30°.

[0013] In some embodiments, the earhook forms a third projection on the first symmetry plane. 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 characteristic point. The distance between the first projection point and the second characteristic point is 15 mm - 20 mm.

[0014] In some embodiments, the outer end face of the sound outlet hole can form an arc segment when projected on the first symmetry plane. The arc length of the arc segment is in the range of 5.2 mm - 16.7 mm, and the width of the sound outlet hole is in the range of 1.4 mm - 2.2 mm.

[0015] In some embodiments, the sound generating assembly includes two sound drivers. A first sound transmission channel is formed between the diaphragms of the two sound drivers. The sound outlet hole is acoustically connected to the first sound transmission channel. The first sound transmission channel forms the front cavity of the two sound drivers or a part of the front cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This specification will be further described by way of exemplary embodiments, and these exemplary embodiments will be described in detail through the drawings. These embodiments are not restrictive. In these embodiments, the same numbers represent the same structures, where: In these embodiments, the same reference numerals are used to denote the same components, and:

[0017] Figure 1Ais a schematic diagram of an exemplary ear according to some embodiments of the present specification;

[0018] Figure 1B is a schematic diagram of the wearing of an earclip-type earphone according to some embodiments of the present specification;

[0019] Figure 2 is an exemplary structural diagram of an earclip-type earphone according to some embodiments of the present specification;

[0020] Figure 3 is an exemplary structural diagram of an earclip-type earphone from another angle according to some embodiments of the present specification;

[0021] Figure 4A is a schematic diagram of the projection of an earclip-type earphone on the first symmetry plane according to some embodiments of the present specification;

[0022] Figure 4B is a schematic diagram of the projection of an earclip-type earphone on the first symmetry plane according to some embodiments of the present specification;

[0023] Figure 5 is an exemplary structural diagram of a sound generating part according to some embodiments of the present specification;

[0024] Figure 6 is an exemplary structural diagram of a pressure relief hole according to some embodiments of the present specification;

[0025] Figure 7 is the corresponding frequency response curve of the rear cavity when the pressure relief hole has different areas according to some embodiments of the present specification;

[0026] Figure 8 is the corresponding frequency response curve of the front cavity when the sound outlet hole has different areas according to some embodiments of the present specification;

[0027] Figure 9 is an exemplary structural diagram of a housing according to some embodiments of the present specification;

[0028] Figure 10A is a schematic diagram of the sound field of a free field according to some embodiments of the present specification;

[0029] Figure 10B is a schematic diagram of the sound field of a reflection field according to some embodiments of the present specification;

[0030] Figure 10C is a sound pressure level curve graph of a free field and a reflection field according to some embodiments of the present specification;

[0031] Figure 11A is a schematic diagram of the positional relationship between a sound generating part and a reflection wall surface according to some embodiments of the present specification;

[0032] Figure 11B is the sound pressure level curve graph of the reflection field corresponding to different distances h shown in some embodiments of this specification;

[0033] Figure 11C is the sound pressure level curve graph of the reflection field corresponding to different included angles θ shown in some embodiments of this specification;

[0034] Figure 12 The sound pressure level curve graph of the reflection field corresponding to different distances h shown in some embodiments of this specification;

[0035] Figure 13 is the sound pressure level curve graph corresponding to the same frequency, the same distance h, and different included angles θ shown in some embodiments of this specification;

[0036] Figure 14 is an exemplary structural diagram of another earclip-type earphone shown in some embodiments of this specification;

[0037] Figure 15 is an exemplary structural diagram of the sound generating part shown in some embodiments of this specification;

[0038] Figure 16 is a schematic diagram of the position of the sound outlet hole and the wearing state shown in some embodiments of this specification;

[0039] Figure 17 is a schematic diagram of the wearing state at different β angles shown in some embodiments of this specification;

[0040] Figure 18 is the frequency response curve graph at the ear canal opening corresponding to different β angles when α is 0 shown in some embodiments of this specification;

[0041] Figure 19 is the frequency response curve graph at the ear canal opening corresponding to different α angles when β is 0 shown in some embodiments of this specification. Detailed implementation manners

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required in the description of the embodiments. Obviously, the drawings in the following description are only some examples or embodiments of this application. For those of ordinary skill in the art, without creative efforts, this application can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation. For those of ordinary skill in the art, without creative efforts, this application can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0043] It should be understood that the terms “system”, “device”, “unit” and / or “module” used herein are used to distinguish between different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0044] As used in this application and claims, “a,” “an,” or “an” are used herein unless the context clearly indicates an exception. The words "kind" and / or "the" do not refer to the singular but also include the plural. Generally speaking, the terms "include" and "comprise" only Tips include clearly identified steps and elements, which do not constitute an exclusive list, method or device. The preparation may also include other steps or elements.

[0045] In the description of this specification, it should be understood that the terms "first", "second", "third", "fourth", etc. It is for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features specified as "first", "second", "third", and "fourth" may explicitly or implicitly include at least In the description of this specification, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In this specification, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, the term "connection" can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, it can refer to the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this specification can be understood according to the specific circumstances.

[0047] Figure 1A is a schematic diagram of an exemplary ear according to some embodiments of the present specification. Figure 1A, the ear part 100 (which can also be referred to as the auricle) may include the external auditory canal 101, the concha 102, the cymba conchae 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, the helix 107, the lobule 108, the tragus 109, and the helix crus 1071. In some embodiments, the stable wearing of the acoustic device can be achieved by means of the support of one or more parts of the ear part 100. In some embodiments, parts such as the external auditory canal 101, the concha 102, the cymba conchae 103, and the triangular fossa 104 have a certain depth and volume in three-dimensional space and can be used to meet the wearing requirements of the acoustic device. For example, an acoustic device (such as an in-ear headphone) can be worn in the external auditory canal 101. In some embodiments, the wearing of the acoustic device can be achieved by means of other parts of the ear part 100 except the external auditory canal 101. For example, the wearing of the acoustic device can be achieved by means of parts such as the cymba conchae 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, the helix 107, or a combination thereof. In some embodiments, in order to improve the comfort and reliability of the acoustic device in terms of wearing, parts such as the user's lobule 108 can be further utilized. By means of other parts of the ear part 100 except the external auditory canal 101, the wearing of the acoustic device and the transmission of sound can be achieved, which can "liberate" the user's external auditory canal 101. When the user wears the acoustic device, the acoustic device does not block the user's external auditory canal 101 (or ear canal or ear opening), and the user can receive both the sound from the acoustic device and the sound from the environment (such as the sound of a whistle, a bicycle bell, surrounding voices, traffic command sounds, etc.), thereby being able to reduce the probability of traffic accidents. In some embodiments, according to the structure of the ear part 100, the acoustic device can be designed into a structure adapted to the ear part 100 to achieve the wearing of the sound-emitting part of the acoustic device at various different positions of the ear. For example, when the acoustic device is an ear clip-type headphone, the ear clip-type headphone may include a sound-emitting part, a contact part, and an ear hook. The ear hook has an arc-shaped structure and can bypass the wearer's antihelix 105 and helix 107 to connect the sound-emitting part and the contact part, so that the sound-emitting part is located in the wearer's concha 102 and contacts the concha 102 wall, and the contact part abuts against the back of the wearer's ear.

[0048] Different users may have individual differences, resulting in different shapes, sizes, etc. of the ears. For the convenience 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 the wearing methods of the acoustic devices in different embodiments on this ear model. For example, a simulator including a head and its (left and right) ears can be made based on the ANSI:S3.36, S3.25 and IEC:60318-7 standards, such as GRAS45BC KEMAR, as a reference for wearing the acoustic device, so as to present the scenario of most users wearing the acoustic device normally. Merely as an example, the ear used as a reference can have the following relevant characteristics: the size of the projection of the auricle on the sagittal plane in the vertical axis direction can be in the range of 49.5mm - 74.3mm, and the size of the projection of the auricle on the sagittal plane in the sagittal axis direction can be in the range of 36.6mm - 55mm. Therefore, in this application, descriptions such as "the wearer wears", "in the wearing state" and "in the wearing state" can refer to the acoustic device described in this application being worn on the ear of the aforementioned simulator. Of course, considering the individual differences of different users, the structure, shape, size, thickness, etc. of one or more parts of the ear 100 can have certain differences. To meet the needs of different users, the acoustic device can be designed differently, and these different designs can be manifested as the characteristic parameters of one or more structures in the acoustic device (for example, the sound generating part, ear hook, etc. in the following text) can have different ranges of values to adapt to different ears.

[0049] It should be noted that: in the fields of medicine, anatomy, etc., three basic sections of the human body, namely the sagittal plane, coronal plane and horizontal plane, and three basic axes, namely the sagittal axis, coronal axis and vertical axis, can be defined. Among them, the sagittal plane is a vertical section made along the front-back direction of the body (such as from the front of the chest to the back) and divides the human body into left and right parts; the coronal plane is a vertical section made along the left-right direction of the body (such as from the left shoulder to the right shoulder) and divides the human body into front and back parts; the horizontal plane is a horizontal section made along the up-down direction perpendicular to the body (such as from the top of the head to the soles of the feet) and divides the human body into upper and lower parts. Correspondingly, the sagittal axis is an axis along the front-back direction of the body and perpendicular to the coronal plane, the coronal axis is an axis along the left-right direction of the body and perpendicular to the sagittal plane, and the vertical axis is an axis along the up-down direction of the body and perpendicular to the horizontal plane. Among them, observing the ear of the aforementioned simulator along the direction of the human coronal axis, the schematic diagram of the front contour of the ear shown in Figure 1 can be obtained.

[0050] Figure 1BIt is a schematic diagram of the wearing state of an earclip-type earphone shown in some embodiments of this specification. In some embodiments, the earclip-type earphone may include, but is not limited to, an air conduction earphone, a bone conduction earphone, and an earphone that combines air conduction and bone conduction, etc. As Figure 1B shown, the earclip-type earphone 100-1 may include a sound generating part 100-11, a contact part 100-12, and an ear hook 100-13 that connects the sound generating part 100-11 and the contact part 100-12. The earclip-type earphone 100-1 can be clamped on the ear 100 of the wearer through the cooperation of the ear hook 100-13, the sound generating part 100-11, and the contact part 100-12.

[0051] In some embodiments, when the earclip-type earphone 100-1 is in the wearing state, the sound generating part 100-11 is located within the concha of the wearer (such as the concha 102) and is in contact with the concha wall. The contact part 100-12 abuts against the back of the wearer's ear, for example, against the back of the concha. Both ends of the ear hook 100-13 are respectively connected to the contact part 100-12 and the sound generating part 100-11, and a middle region between both ends of the ear hook 100-13 forms an extension section with a certain curvature, so that the ear hook 100-13 can bypass the antihelix (such as the antihelix 105) and the helix (such as the helix 107) of the wearer when worn. The ear hook 100-13 can have elasticity, which is manifested as when the sound generating part 100-11 moves away from the contact part 100-12, the ear hook 100-13 can provide an elastic force that drives the sound generating part 100-11 to approach the contact part 100-12. In the wearing state, the elastic force of the ear hook 100-13 can be converted into a clamping force that clamps the sound generating part 100-11 and the contact part 100-12 on both sides of the concha, ensuring the stability of wearing.

[0052] In some embodiments, in order to match the shape of the concha, the outer shape of the housing of the sound generating part 100-11 needs to be close to the shape of the concha, being spherical, spheroid-like, or spindle-shaped, so that the sound generating part 100-11 can fully contact the concha wall and cooperate with the contact part 100-12 to clamp on both sides of the concha. Limited by the spatial size of the concha, the volume of the housing of the sound generating part 100-11 is small, which limits the size of the sound generating component located inside the housing, resulting in a low sound generating efficiency of the sound generating part 100-11.

[0053] Based on this, an embodiment of this specification proposes an earclip-type earphone, which includes: a sound generating part, a contact part, and an ear hook for connecting the sound generating part and the contact part. An acoustic hole is provided on the housing of the sound generating part. In the wearing state, a part of the area of the acoustic hole is blocked by the concha wall, and the unblocked area of the acoustic hole faces the ear canal opening of the wearer. By setting that a part of the area of the acoustic hole is blocked by the concha wall, in the vicinity of the sound propagation direction, the concha wall constitutes a reflecting wall surface in the sound propagation direction, and the reflecting wall surface will reflect the sound, thereby enabling the sound field of the sound derived from the acoustic hole to form a reflection field. In the reflection field, the reflected sound wave and the source sound wave (i.e., the original sound wave derived from the acoustic hole) interfere and diffract with each other to form a sound enhancement area, thereby enhancing the sound volume transmitted to the ear canal opening of the wearer.

[0054] Figure 2 is an exemplary structural diagram of an earclip-type earphone shown according to some embodiments of this specification. Figure 3 is an exemplary structural diagram of another angle of the earclip-type earphone shown according to some embodiments of this specification. Among them, Figure 2 is a front view when the earclip-type earphone is placed upright on a horizontal plane (such as a desktop), Figure 3 is a front view when the earclip-type earphone is placed horizontally on a horizontal plane (such as a desktop). Combining Figure 2 and Figure 3 , in some embodiments, the earclip-type earphone 200 may include a sound generating part 210, a contact part 220, and an ear hook 230 for connecting the sound generating part 210 and the contact part 220. The ear hook 230 is integrally in an arc structure. Combining the above, when the earclip-type earphone 200 is in the wearing state, the ear hook 230 can bypass the antihelix (such as the antihelix 105) and helix (such as the helix 107) of the wearer, so that the sound generating part 210 is located in the concha (such as the concha 102) of the wearer and contacts the concha wall, and the contact part 220 abuts against the back of the wearer's ear. The sound generating part 210 and the contact part 220 form a clamping shape to clamp the ear, thereby clamping and wearing the earclip-type earphone 200 on the helix of the wearer to achieve stable wearing of the earclip-type earphone 200.

[0055] The sound generating part 210 is a sound playing device. The sound generating part 210 is used to convert an electrical signal into a sound signal and play the sound signal to the wearer. For example, the sound signal generated by the sound generating part 210 can be transmitted to the ear canal opening of the wearer through the acoustic hole 213 of the sound generating part 210.

[0056] In some embodiments, as Figure 3 shown, the sound generating part 210 may include a housing 211, a sound generating component (for example, Figure 5The sound - generating component 212) and the sound outlet hole 213 in it. The housing 211 can be a frame body with a hollow structure. The earhook 230 is connected to the housing 211. The housing 211 can form an accommodation cavity for accommodating other components of the sound - generating part 210 (for example, the sound - generating component). In some embodiments, the housing 211 may include a first rigid housing (for example, Figure 9 the first rigid housing 2111 in it) and a second rigid housing (for example, Figure 9 the second rigid housing 2112 in it). The first rigid housing and the second rigid housing enclose to form an accommodation cavity. One of the two rigid housings (for example, the second rigid housing) faces the wearer's concha cavity and contacts the concha cavity wall. The other rigid housing is connected to the earhook 230. In some embodiments, the material of the rigid housing can be plastic, metal, or other support materials that can be used as a headphone housing to provide better support and stability for the internal structure of the housing 211 (such as the sound - generating component). In some embodiments, the housing 211 may further include a flexible housing (for example, Figure 9 the first flexible body 2113 in it). The outer surface of one of the two rigid housings that contacts the wearer's concha cavity wall (such as the second rigid housing) can be covered with a flexible housing, and the flexible housing can improve the comfort when the ear - clip type headphone 200 is worn and the matching degree of the ear - clip type headphone 200 with the user's ear (such as the concha cavity). For more content about the housing 211, reference can be made to other parts of this specification, for example, Figure 9 and its related descriptions.

[0057] The sound generating component is a module capable of converting an electrical signal into a sound signal. The sound generating component is located in the accommodation cavity formed by the housing 211. In some embodiments, the sound generating component may include a sound driver (also referred to as a speaker). The sound driver can convert an electrical signal into a sound signal and output it. Exemplarily, the sound driver may have a diaphragm, and a coil and a magnetic circuit component (e.g., a magnet, a magnetic shield) capable of driving the diaphragm to vibrate. The diaphragm can divide 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 may be the side where the diaphragm faces away from the magnetic circuit component, and the rear side of the sound driver may be the side where the diaphragm faces the magnetic circuit component or the side where the magnetic circuit component faces away from the diaphragm. During vibration, the side of the diaphragm facing away from the magnetic circuit component and the side facing the magnetic circuit component will generate sounds respectively. The sound generated on the side of the diaphragm facing away from the magnetic circuit component radiates outward through the front cavity, and the sound generated on the side of the diaphragm facing the magnetic circuit component radiates outward through the rear cavity. In some embodiments, the sound generating component may include two sound drivers. The two sound drivers are arranged oppositely (i.e., the diaphragms of the two sound drivers are arranged oppositely), and a sound transmission channel (also referred to as the 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 hole 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 successively away from its corresponding diaphragm, and a chassis for support. Another sound transmission channel (also referred to as the second sound transmission channel) may be formed between the two chassis, and the backs of the two diaphragms are acoustically connected through the ventilation holes on the chassis and the second sound transmission channel. The second sound transmission channel forms the rear cavity of the two sound drivers or a part of the rear cavity (it can also be understood that the two sound drivers share the rear cavity). For more descriptions of the sound generating component, see other parts of this specification. For example, Figure 5 , and its related descriptions.

[0058] Such as Figure 3As shown, the sound outlet hole 213 is located on the housing 211, and the sound outlet hole 213 can conduct the sound generated by the sound generating component. In some embodiments, the shape structure of the outer end surface of the sound outlet hole 213 may be a strip structure (for example, a long strip). In some embodiments, the sound outlet hole 213 may be disposed in the center of the housing 211. In this case, the outer end surface of the sound outlet hole 213 is symmetric about the bisecting plane of the bottom surface of the housing 211. The bottom surface of the housing 211 refers to the surface opposite to the end surface where the housing 211 is connected to the ear hook 230. In the wearing state, the bottom surface of the housing 211 faces the wearer's ear canal (such as the external auditory canal 101). The bisecting plane of the bottom surface is a plane parallel to the extending direction of the ear hook 230 (or, it may also be a plane parallel or coincident with the first symmetry plane 300 of the ear hook 230 described later), and this plane divides the bottom surface of the housing 211 into two symmetric (or approximately symmetric) parts. In some embodiments, the sound outlet hole 213 may also be offset on the housing 211. In this case, the outer end surface of the sound outlet hole 213 is asymmetric about the bisecting plane of the bottom surface of the housing 211. For example, the sound outlet hole 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 hole 213 may face the wearer's ear canal opening, the sound outlet hole 213 is not blocked by the concha wall, and the sound field of the sound conducted by the sound outlet hole 213 is a free field. The volume of the sound in the free field is small, which results in a small volume of the sound transmitted to the wearer's ear canal opening. To increase the volume of the sound conducted by the sound outlet hole 213 transmitted to the ear canal opening, in some embodiments, by designing the position of the sound generating part 210 in the concha and the position of the sound outlet hole 213 on the housing 211, a part of the area of the sound outlet hole 213 can be blocked by the concha wall, and the unblocked area of the sound outlet hole 213 faces the wearer's ear canal opening. By setting that a part of the area of the sound outlet hole 213 is blocked by the concha wall, the sound field of the sound conducted by the sound outlet hole 213 can form a reflection field, thereby enhancing the volume of the sound transmitted to the ear canal opening. Specifically, when a part of the area of the sound outlet hole 213 is blocked by the concha wall, in the vicinity of the sound propagation direction, the concha wall constitutes a reflection wall surface in the sound propagation direction, and this reflection wall surface will reflect the sound. The interference and diffraction between the reflected sound wave and the source sound wave (that is, the original sound wave conducted by the sound outlet hole 213) can form a sound enhancement area, thereby increasing the volume of the sound. In some embodiments, by setting parameters such as the sound outlet hole 213 and / or the housing 211, a part of the area of the sound outlet hole 213 can be blocked by the concha wall to form reflection enhancement, and a part of the area of the sound outlet hole 213 is not blocked, and the unblocked area of the sound outlet hole 213 faces the ear canal, so that the sound can be transmitted to the wearer's ear canal in a timely and accurate manner, thereby improving the listening effect and listening volume. For more descriptions of the free field and the reflection field, reference can be made to Figures 10A - 13 F and its related descriptions. For more descriptions of the parameter settings of the sound outlet hole 213 and / or the housing 211, etc., reference can be made to other parts of this specification. For example,Figure 4A and its related descriptions.

[0059] The abutting part 220 abuts against the back of the wearer's ear. The abutting part 220 and the sound generating part 210 cooperate to form a clamping shape to clamp the ear. In some embodiments, the abutting part 220 may have an abutting housing, and the abutting part 220 is connected to the ear hook 230 through the abutting housing. The abutting housing may form an accommodation space. In some embodiments, the accommodation space formed by the abutting housing may be used as a battery compartment for accommodating a battery and / or other components (such as a circuit board). In some embodiments, the battery may supply electrical energy to the ear clip-type earphone 200. For example, the battery may be electrically connected to the sound generating component of the sound generating part 210 so that the battery can supply electrical energy for the sound generation of the sound generating component. In some embodiments, the circuit board may be electrically connected to the sound generating component of the sound generating part 210 (for example, through a wire or a flexible circuit board) so that the circuit board can control the sound generation of the sound generating component. In some embodiments, both the circuit board and the battery may be disposed in the accommodation space formed by the abutting housing. In some embodiments, the circuit board and the battery may also be respectively disposed in the accommodation space formed by the abutting housing and the accommodation cavity formed by the housing 211 of the sound generating part 210, and the circuit board and the battery may be electrically connected to each other through corresponding conductors and further electrically connected to the sound generating component of the sound generating part 210 through the conductors.

[0060] In combination with the above, in the worn state, the ear hook 230 can bypass the wearer's antihelix (such as antihelix 105) and helix (such as helix 107), so that the sound generating part 210 is located in the wearer's concha and contacts the concha wall, and the abutting part 220 abuts against the back of the wearer's ear. In some embodiments, a titanium wire may be provided in the ear hook 230, and the titanium wire extends along the extending direction of the ear hook 230. Compared with other materials, the titanium wire has excellent properties such as high mechanical strength, high toughness, and light weight, so as to ensure the stability and comfort of wearing the ear clip-type earphone 200. In some embodiments, a titanium sheet may be provided in the ear hook 230. The titanium sheet has a sheet-like structure, and the titanium sheet extends along the extending direction of the ear hook 230. The surface of the titanium sheet is perpendicular to the symmetry plane (i.e., the first symmetry plane 300) of the ear hook 230 along its extending direction. During the wearing process or in the worn state, the titanium sheet can reduce or avoid the torsion of the ear hook 230, thereby further improving the stability and comfort of wearing the ear clip-type earphone 200. In some embodiments, the ear hook 230 may include a first connecting section, an extending section, and a second connecting section that are connected in sequence. The first connecting section, the extending section, and the second connecting section are all arc-shaped structures. The first connecting section refers to a partial area where the ear hook 230 is connected to the sound generating part 210, the second connecting section refers to a partial area where the ear hook 230 is connected to the abutting part 220, and the extending section refers to the area between the first connecting section and the second connecting section. In some embodiments, by setting the parameters of the first connecting section (such as arc length, curvature, etc.), it can be ensured that the sound generating part 210 does not touch the tragus and does not block the wearer's ear canal, thereby improving the wearing comfort and safety of the ear clip-type earphone 200. In some embodiments, the curvature of the second connecting section can be set to be relatively large (i.e., the bending degree of the second connecting section is relatively high), so that the overall layout of the ear clip-type earphone 200 is more compact, reducing the space volume occupied by the ear clip-type earphone 200 and improving the convenience of storage or carrying. The curvature of the second connecting section may refer to the curvature of the arc segment of the inner contour or outer contour of the projection of the second connecting section on the symmetry plane (i.e., the first symmetry plane 300) of the ear hook 230 along its extending direction. In some embodiments, the extending length of the extending section can be set to be relatively large (for example, greater than a length threshold), so as to ensure that the ear clip-type earphone 200 can adapt to the ear sizes of different people. The extending length refers to the length of the extending section along the extending direction.

[0061] In some embodiments, the ear hook 230 may have a first symmetry plane. Refer to Figure 3 , in some embodiments, the ear hook 230 has a first symmetry plane 300 along its extending direction. The first symmetry plane 300 is parallel or substantially parallel to the extending direction of the ear hook 230. The first symmetry plane 300 divides the ear hook 230 into two symmetric or approximately symmetric parts. The extending direction of the ear hook 230 refers to the direction from the end where the ear hook 230 is connected to the abutting part 220 to the end where the ear hook 230 is connected to the sound generating part 210.

[0062] In some embodiments, the outer end face shape of the sound outlet hole 213 can be a curved strip structure. As described above, the sound outlet hole 213 can be disposed in the center or offset on the housing 211. Combining Figure 3 , when the sound outlet hole 213 is disposed in the center of the housing 211, the outer end face of the sound outlet hole 213 can be symmetric about the first symmetry plane 300; when it is offset and disposed on the housing 211, the outer end face of the sound outlet hole 213 is asymmetric about the first symmetry plane 300. It can be understood that since the housing 211 of the sound generating part 210 has a certain thickness, the sound outlet hole 213 is opened on the housing 211 to export the sound output by the sound generating component to the outside of the earclip-type earphone 200. Therefore, the sound outlet hole 213 also has a certain depth. Based on this, the outer end face of the sound outlet hole 213 can refer to the end face of the sound outlet hole 213 located on the outer wall surface of the housing 211.

[0063] In some embodiments, the projection of the outer end face of the sound outlet hole 213 on the first symmetry plane 300 can form an arc segment, and the projection of the housing 211 on the first symmetry plane 300 has an arc-shaped outer contour, and at least part of the arc-shaped outer contour overlaps with the arc segment. For the convenience of description, hereinafter, the arc segment formed by the projection of the outer end face of the sound outlet hole 213 on the first symmetry plane 300 will be simply denoted as the arc segment of the sound outlet hole 213; the arc-shaped outer contour of the projection of the housing 211 on the first symmetry plane 300 will be simply denoted as the arc-shaped outer contour of the housing 211. In some embodiments, the sound generating part 210 (or the housing 211) as a whole can be approximately spherical, and the projection of the housing 211 on the first symmetry plane 300 can have an arc-shaped outer contour. Since the sound outlet hole 213 is opened on the housing 211 of the sound generating part 210, therefore, the outer end face of the sound outlet hole 213 is an arc-shaped structure. Based on this, it can be known that the projection of the outer end face of the sound outlet hole 213 on the first symmetry plane 300 can form an arc segment. Further, when the outer end face of the sound outlet hole 213 is symmetric about the first symmetry plane 300, at least part of the arc segment of the sound outlet hole 213 overlaps with the arc-shaped outer contour of the housing 211.

[0064] By setting at least part of the arc-shaped outer contour of the housing 211 to overlap with the arc segment of the sound outlet hole 213, it can be ensured that the outer end face of the sound outlet hole 213 is symmetric about the first symmetry plane 300, so as to ensure that part of the area of the sound outlet hole 213 can be blocked by the concha wall in the wearing state, so that the sound field of the sound exported by the sound outlet hole 213 is a reflection field, forming emission enhancement, thereby increasing the volume heard by the wearer.

[0065] Figure 4AIt is a schematic diagram of the projection of the earclip-type earphone shown in some embodiments of this specification on the first symmetry plane. In some embodiments, there are feature points on the housing 211 that are in contact with the abutting portion 220 or are closest to the abutting portion 220 in terms of distance. In some embodiments, when the earclip-type earphone 200 is in a natural state (i.e., in an un-worn state), the housing 211 of the sound-emitting portion 210 and the abutting portion 220 may be in contact. When the contact mode between the housing 211 and the abutting portion 220 is point contact, at this time, the point on the housing 211 that is in contact with the abutting portion 220 is the feature point. Here, the point contact may mean that the place on the housing 211 that is in contact with the abutting portion 220 is a point, or the area of the contact region on the housing 211 that is in contact with the abutting portion 220 is small and can be approximated as a point. When the contact mode between the housing 211 and the abutting portion 220 is surface contact, at this time, the centroid of the contact surface of the housing 211 that is in contact with the abutting portion 220 is the feature point. In some embodiments, when the earclip-type earphone 200 is in a natural state, the housing 211 of the sound-emitting portion 210 and the abutting portion 220 may also not be in contact, and there is a certain distance between the two. At this time, the point on the housing 211 that is closest to the abutting portion 220 is the feature point. The point on the housing 211 that is closest to the abutting portion 220 refers to the end point on the housing 211 where the shortest connection line between the housing 211 and the abutting portion 220 is located. In some embodiments, as Figure 4A shown, the feature point on the housing 211 projects onto the first symmetry plane 300 to form the first projection point A.

[0066] Continue to refer to Figure 4A , the sound outlet hole 213 in the foregoing text projects onto the first symmetry plane 300 to form an arc segment, and this arc segment can correspond to Figure 4A the arc BC formed by the midpoint B and the point C. The arc segment includes two end points, a first end point B and a second end point C. The first end point B is the end point among the two end points of the arc segment that is closer to the first projection point A. The second end point C is the end point among the two end points of the arc segment that is farther from the first projection point A.

[0067] Since the feature points on the housing 211 are located in the area on the housing 211 that is closest to the abutting portion 220, when the earclip-type earphone 200 is in a worn state, the housing 211 and the abutting portion 220 form a clamping inside and outside the concha cavity, so the feature points on the housing 211 will be blocked by the concha cavity. Based on this, a partial area of the sound outlet hole 213 that is closer to the feature points on the housing 211 can be blocked by the concha cavity wall, and a partial area of the sound outlet hole 213 that is farther from the feature points on the housing 211 is not blocked by the concha cavity wall. Corresponding to the projection curve or projection point, the area of the arc segment of the sound outlet hole 213 that is close to the first projection point A is blocked by the concha cavity wall, and the area of the arc segment that is far from the first projection point A is not blocked. This means that when a partial area of the sound outlet hole 213 can be blocked by the concha cavity wall, the first partial area to be blocked is the first end point B of the arc segment and the partial area close to the first end point B; the unblocked area of the sound outlet hole 213 is the second end point C of the arc segment and the partial area close to the second end point C. Compared with the first end point B, the second end point C is closer to the ear hole. Therefore, the distance (such as arc length) between the first end point B and / or the second end point C of the arc segment and the first projection point A can affect the position of the sound outlet hole 213 relative to the concha cavity during wearing, thereby affecting whether the concha cavity wall can block or not block a partial area of the sound outlet hole 213.

[0068] In some embodiments, in order to ensure that a partial area of the sound outlet hole 213 can be blocked by the concha cavity wall, the arc length between the first end point B of the arc segment and the first projection point A is in the range of 1.7 mm - 4.5 mm. In some embodiments, in order to ensure that a partial area of the sound outlet hole 213 can be blocked by the concha cavity wall, the arc length between the first end point B of the arc segment and the first projection point A is in the range of 2 mm - 4 mm.

[0069] In some embodiments, in order to ensure that a partial area of the sound outlet hole 213 is not blocked by the concha cavity wall, the arc length between the second end point C of the arc segment and the first projection point A is in the range of 12 mm - 15.5 mm. In some embodiments, in order to ensure that a partial area of the sound outlet hole 213 is not blocked by the concha cavity wall, the arc length between the second end point C of the arc segment and the first projection point A is in the range of 13 mm - 15 mm.

[0070] It can be understood that the arc segment of the sound outlet hole 213 overlaps at least partially with the arc-shaped outer contour of the housing 211. Therefore, both the first end point B and the second end point C of the arc segment are on the arc-shaped outer contour of the housing 211. The feature point is a "point" on the outer wall surface of the housing 211. Therefore, the first projection point A of the feature point is also on the arc-shaped outer contour of the housing 211. Therefore, the arc between the first end point B / second end point C and the first projection point A is a partial arc of the arc-shaped outer contour of the housing 211.

[0071] In some embodiments, the housing 211 projects onto the first symmetry plane 300 to form a first projection 211', and the abutting portion 220 projects onto the first symmetry plane 300 to form a second projection 220'. The first projection 211' and the second projection 220' have a common tangent line L. The common tangent line L is a tangent line that is tangent to both the lower endpoint of the first projection 211' and the lower endpoint of the second projection 220'. It should be noted that when the earclip-type earphone 200 is placed upright on a horizontal plane (such as a tabletop), the sound-emitting portion 210 and the abutting portion 220 face the horizontal plane and are in contact with the horizontal plane, and the earhook 230 is not in contact with the horizontal plane. The earclip-type earphone 200 can be placed stably without tipping over. Based on this, the lower endpoint of the first projection 211' refers to the projection point formed by the intersection of the sound-emitting portion 210 and the horizontal plane (or the centroid of the contact surface where the sound-emitting portion 210 contacts the horizontal plane) when the earclip-type earphone 200 is placed upright on the horizontal plane and projected onto the first symmetry plane 300. The lower endpoint of the second projection 220' refers to the projection point formed by the intersection of the abutting portion 220 and the horizontal plane (or the centroid of the contact surface where the abutting portion 220 contacts the horizontal plane) when the earclip-type earphone 200 is placed upright on the horizontal plane and projected onto the first symmetry plane 300.

[0072] In some embodiments, the common tangent line L is tangent to the first projection 211' at the lower endpoint of the first projection 211', and the tangent point is denoted as the first tangent point D. When the earclip-type earphone 200 is in a worn state, the first tangent point D approximately corresponds to the position directly opposite the ear canal opening. In some embodiments, the first tangent point D of the common tangent line L and the first projection 211' can be located on the arc segment of the sound outlet hole 213 (as Figure 4A shown, the first tangent point D is located on the arc BC). Combining the above, when a partial area of the sound outlet hole 213 can be blocked by the inner wall of the concha, the first blocked partial area is the first endpoint B of the arc segment and the partial area near the first endpoint B; the unblocked area of the sound outlet hole 213 is the second endpoint C of the arc segment and the partial area near the second endpoint C. Therefore, most of the area of the arc segment of the sound outlet hole 213 between the first tangent point D and the first endpoint B can be blocked by the concha wall, and the area of the arc segment of the sound outlet hole 213 between the first tangent point D and the second endpoint C is hardly blocked by the concha wall.

[0073] Since most of the area on the arc segment of the sound outlet hole 213 between the first tangent point D and the first end point B can be blocked by the concha wall, and the area on the arc segment of the sound outlet hole 213 between the first tangent point D and the second end point C is hardly 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 outlet hole 213 blocked by the concha wall or the unblocked area. For example, when the first tangent point D is closer to the first end point B, the blocked area of the sound outlet hole 213 is smaller and the unblocked area is larger; when the first tangent point D is closer to the second end point C, the blocked area of the sound outlet hole 213 is larger and the unblocked area is smaller.

[0074] In some embodiments, in order to ensure that the blocked area and / or the unblocked area of the sound outlet hole 213 has appropriate dimensions to enhance the sound enhancement effect of the reflection field, the ratio of the arc length between the first end point B and the first tangent point D of the arc segment to the arc length between the second end point C and the first tangent point D of the arc segment is in the range of 0.5 - 0.85. In some embodiments, in order to ensure that the blocked area and / or the unblocked area of the sound outlet hole 213 has appropriate dimensions, the ratio of the arc length between the first end point B and the first tangent point D of the arc segment to the arc length between the second end point C and the first tangent point D of the arc segment is in the range of 0.6 - 0.75.

[0075] In some embodiments, the normal line at the first tangent point D intersects the normal line at the first end point B or the normal line at the second end point C of the arc segment at the center point O. In some embodiments, when the first tangent point D, the first end point B, and the second end point C are concyclic, the normal lines at the first tangent point D, the first end point B, and the second end point C intersect at one point, and this point is the center point O. In some embodiments, when the first tangent point D, the first end point B, and the second end point C are not concyclic, the center point can be the intersection point of the normal line at the first tangent point D and the normal line at the first end point B; or, the center point can also be the intersection point of the normal line at the first tangent point D and the normal line at the second end point C.

[0076] In some embodiments, the line connecting the first endpoint B and the center point O and the line connecting the first tangent point D and the center point O form a first included angle (such as ∠BOD), and the line connecting the second endpoint C and the center point O and the line connecting the first tangent point D and the center point O form a second included angle (such as ∠COD). The magnitude of the first included angle can reflect the arc length between the first tangent point D and the first endpoint B of the arc segment. Specifically, the larger the first included angle, the longer the arc length between the first tangent point D and the first endpoint B of the arc segment; the smaller the first included angle, the shorter the arc length between the first tangent point D and the first endpoint B of the arc segment. Similarly, the magnitude of the second included angle can reflect the arc length between the first tangent point D and the second endpoint C of the arc segment. Specifically, the larger the second included angle, the longer the arc length between the first tangent point D and the second endpoint C of the arc segment; the smaller the second included angle, the shorter the arc length between the first tangent point D and the second endpoint C of the arc segment. The ratio of the first included angle to the second included angle can reflect the position of the first tangent point D on the arc segment. For example, the larger the ratio of the first included angle to the second included angle, the closer the first tangent point D is to the second endpoint C of the arc segment. At this time, the blocked area of the sound outlet hole 213 is larger. The smaller the ratio of the first included angle to the second included angle, the closer the first tangent point D is to the first endpoint B of the arc segment. At this time, the blocked area of the sound outlet hole 213 is smaller.

[0077] In some embodiments, in order to ensure that the blocked area and / or the unblocked area of the sound outlet hole 213 has a suitable size to enhance the effect of the reflection field on sound reinforcement, the ratio of the first included angle to the second included angle can be in the range of 0.2 - 1.3. In some embodiments, in order to ensure that the blocked area and / or the unblocked area of the sound outlet hole 213 has a suitable size, the ratio of the first included angle to the second included angle is in the range of 0.5 - 1.0.

[0078] In some embodiments, in order to ensure that the arc length between the first tangent point D and the first endpoint B of the arc segment has a suitable size, the first included angle can be in the range of 15° - 55°. In some embodiments, in order to ensure that the arc length between the first tangent point D and the first endpoint B of the arc segment has a suitable size, the first included angle can be in the range of 25° - 45°.

[0079] In some embodiments, in order to ensure that the arc length between the first tangent point D and the second endpoint C of the arc segment has a suitable size, the second included angle is in the range of 40° - 80°. In some embodiments, in order to ensure that the arc length between the first tangent point D and the second endpoint C of the arc segment has a suitable size, the second included angle is in the range of 50° - 70°.

[0080] In some embodiments, the arc length of the arc segment of the sound outlet hole 213 (i.e., the arc length of arc BC) can affect whether a partial area of the sound outlet hole 213 can be blocked or unblocked by the concha wall, as well as the size of the blocked area or the unblocked area.

[0081] In some embodiments, if the arc length of the arc segment is too small, it may cause the blocked area of the sound outlet hole 213 to be too small or even unable to be blocked. For example, when the arc length of the arc segment is too small and the arc length between the first endpoint B of the arc segment and the first projection point A is large, it will cause the first tangent point D to 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 too small a blocked area of the sound outlet hole 213; even more, it may cause the first tangent point D not to 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 hole 213 not being blocked.

[0082] In some embodiments, if the arc length of the arc segment is too small, it may also cause the unblocked area of the sound outlet hole 213 to be too small or even completely blocked. 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, it will cause the first tangent point D to 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 too small an unblocked area of the sound outlet hole 213; even more, it may cause the first tangent point D not to 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 hole 213 being completely blocked.

[0083] In some embodiments, if the arc length of the arc segment is too long, the area of the outer end face of the sound outlet hole 213 occupying the outer wall surface of the housing 211 will be larger, which may affect the arrangement of other structures on the housing 211. For example, a pressure relief hole (such as the pressure relief hole 214) may also be provided on the housing 211. To ensure the acoustic performance of the earclip-type earphone 200, the pressure relief hole may be far from the sound outlet hole 213. If the area occupied by the sound outlet hole 213 is large, it may affect the setting of the pressure relief hole or result in a small distance between the pressure relief hole and the sound outlet hole 213. In addition, if the arc length of the sound outlet hole 213 is too long, the area of the sound outlet hole 213 will be large, which will affect the range of the resonance frequency of the front cavity of the earclip-type earphone 200. For more information about the sound outlet hole 213 and the front cavity resonance frequency, reference can be made to other parts of this specification, for example, Figures 7 - 8 , and its related descriptions.

[0084] In some embodiments, to ensure that part of the sound outlet hole 213 is blocked by the concha wall and part is not blocked, the arc length of the arc segment of the sound outlet hole 213 can be greater than 5.2 mm. In some embodiments, to ensure the acoustic performance of the earclip-type earphone 200 and facilitate the arrangement of other structures on the housing 211, the arc length of the arc segment of the sound outlet hole 213 can be less than 16.7 mm.

[0085] In some embodiments, to balance the situation where part of the sound outlet hole 213 is blocked by the concha wall and part is not blocked, and to ensure the acoustic performance of the earclip-type earphone 200, the arc length of the arc segment of the sound outlet hole 213 can be in the range of 5.2 mm - 16.7 mm. In some embodiments, to balance the situation where part of the sound outlet hole 213 is blocked by the concha wall and part is not blocked, and to ensure the acoustic performance of the earclip-type earphone 200, the arc length of the arc segment of the sound outlet hole 213 can be in the range of 7 mm - 15 mm. In some embodiments, the width of the sound outlet hole 213 can be in the range of 1.4 mm - 2.2 mm to ensure that the sound outlet hole 213 has a suitable area range. The width of the sound outlet hole 213 refers to the dimension of the outer end face of the sound outlet hole 213 in the direction perpendicular to the first symmetry plane 300. For more descriptions about the area of the sound outlet hole 213, reference can be made to Figures 7 - 8 , and its related content.

[0086] In some embodiments, the ratio of the arc length of the arc segment of the sound outlet hole 213 to the length of the straight line segment between the first end point B and the second end point C of the arc segment (for ease of description, simply denoted as the arc-chord ratio of the arc segment) can reflect the curvature of the arc segment. In some embodiments, the arc-chord ratio of the arc segment affects the degree of fit between the sound generating part 210 and the concha, thereby affecting whether the concha wall can partially block the sound outlet hole 213 to form reflection enhancement. For example, when the arc-chord ratio of the arc segment is too small and the arc length of the arc segment is relatively large, it may be difficult for the sound generating part 210 to extend into the concha and contact the concha wall, resulting in the inability to form reflection enhancement. In some embodiments, the arc-chord ratio of the arc segment affects the degree of fit between the sound generating part 210 and the concha, thereby affecting the wearing stability of the earclip-type earphone. For example, when the arc-chord ratio of the arc segment is too large, the ear structure may not be able to provide a good limiting effect on the sound generating part 210, resulting in the displacement or rotation of the sound generating part 210 during the wearer's movement, affecting the stability. Based on this, in some embodiments, to improve the degree of fit between the sound generating part 210 and the concha to form reflection enhancement and to improve the wearing stability, the arc-chord ratio of the arc segment can be in the range of 1.05 - 1.4.

[0087] Figure 2 The outer end face of the sound outlet hole 213 of the earclip-type earphone 200 shown inFigure 2 The setting method of the position of the sound outlet hole 213. In some embodiments, the sound outlet hole 213 of the earclip-type earphone 200 can be offset and arranged on the housing 211, that is, the outer end surface of the sound outlet hole 213 is asymmetric with respect to the first symmetry plane 300. For example, the sound outlet hole 213 is arranged on one side of the first symmetry plane 300. When wearing the earclip-type earphone 200, due to factors such as the gravity of the earclip-type earphone 200 or unstable wearing, the earclip-type earphone 200 may be tilted. By offsetting the sound outlet hole 213 on the housing 211, the tilt of the earclip-type earphone 200 caused by factors such as gravity during wearing can be compensated, so that the unobstructed area on the sound outlet hole 213 of the tilted earclip-type earphone 200 can point to the ear canal, thereby ensuring the sound listening effect and volume.

[0088] In some embodiments, the sound outlet hole 213 can have an elongated outer end surface, and the outer end surface has a second symmetry plane parallel to its length extension direction. An included angle can be formed between the second symmetry plane of the sound outlet hole 213 and the first symmetry plane 300 of the earhook 230. The size of this included angle can affect the orientation of the sound outlet hole 213 relative to the ear canal opening in the wearing state. By setting the angle of this included angle, when the earclip-type earphone 200 is tilted, the unobstructed area on the sound outlet hole 213 can point to the ear canal. In some embodiments, when the earclip-type earphone 200 is in the wearing state, due to factors such as gravity, the earclip-type earphone 200 is tilted, and the tilt angle is usually between 0° and 30°. The tilt angle refers to the included angle between the first symmetry plane 300 of the earhook and the human horizontal plane. In some embodiments, in order to ensure that when the earclip-type earphone 200 is tilted, the unobstructed area on the sound outlet hole 213 can point to the ear canal, the included angle between the second symmetry plane of the sound outlet hole 213 and the first symmetry plane 300 of the earhook 230 can be in the range of 15° - 45°.

[0089] In some embodiments, referring to Figure 2 , the earclip-type earphone 200 may further include a pressure relief hole 214. The pressure relief hole 214 is located on the housing 211 of the sound generating part 210. As Figure 2 shown, the pressure relief hole 214 is located on the side of the housing 211 close to the earhook 230 and facing the wearer's ear. In some embodiments, the pressure relief hole 214 is acoustically communicated with the rear cavity of the sound generating component, and the pressure relief hole 214 can lead the sound in the rear cavity to the outside of the housing 211. The pressure relief hole 214 can be used to balance the pressure in the rear cavity, so that the diaphragm of the sound generating component can vibrate fully at low frequencies with large amplitudes, so that the sound can have a bass diving and treble penetration sound quality as much as possible.

[0090] In some embodiments, the sound generated on the front side of the sound driver radiates outward through the sound outlet hole, and the sound generated on the rear side of the sound driver radiates outward through the pressure relief hole. Since the amplitudes of the sound generated on the front side of the sound driver and the sound generated on the rear side of the sound driver are equal and the phases are opposite, the sound radiated through the sound outlet hole and the sound radiated through the pressure relief hole are also approximately equal in amplitude and opposite in phase. When the two sounds are transmitted to the ear canal position, they will cancel each other out in antiphase, 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 hole 213 to weaken the antiphase cancellation between the sound output through the pressure relief hole 214 and the sound output through the sound outlet hole 213 at the ear canal position, thereby increasing the volume of the sound heard by the wearer.

[0091] See Figure 4A , the projection of the center of the pressure relief hole 214 on the first symmetry plane 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 end point 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.

[0092] 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 in the range of 8.1 mm - 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 in the range of 8.5 mm - 10.5 mm.

[0093] 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 far away from the sound outlet hole 213, so as to reduce the influence of the pressure relief hole 214 on the sound output from the sound outlet hole 213, thereby avoiding the sound waves emitted by the pressure relief hole 214 and the sound waves emitted by the sound outlet hole 213 from canceling each other out in the near field and affecting the user's listening volume. In addition, by setting the range of the shortest straight-line distance between the second projection point E and the arc segment, it can also be ensured that the sound outlet hole 213 and the pressure relief hole 214 can be separated by the helix during the wearing state, and the sound output from the pressure relief hole 214 needs to bypass the helix to reach the ear canal opening, thereby further reducing the influence of the pressure relief hole 214 on the sound output from the sound outlet hole 213 and at the same time avoiding sound short circuit.

[0094] It should be noted that since the sound outlet hole 213 and the pressure relief hole 214 are provided on the housing 211, and each side wall of the housing 211 has a certain thickness, the sound outlet hole 213 and the pressure relief hole 214 are both 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 embodiments of this specification, the outer end face of the above-mentioned and following sound outlet hole 213 may refer to the end face of the outer opening of the sound outlet hole 213, and the center of the above-mentioned and following pressure relief hole 214 may refer to the centroid of the outer opening of the pressure relief hole 214. For the convenience of description, in the embodiments of this specification, the area of the sound outlet hole 213 in the following text may refer to the area of the outer opening of the sound outlet 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 outlet hole 213 or the pressure relief hole 214 may also refer to other cross-sectional areas of the sound outlet hole 213 or the pressure relief hole 214, such as the area of the inner opening of the sound outlet hole 213 or the pressure relief hole 214, or the average value of the inner opening area and the outer opening area of the sound outlet hole 213 or the pressure relief hole 214, etc.

[0095] In some embodiments, when the earclip-type earphone 200 is in a worn state, the feature points on the housing 211 and the areas near them will be blocked by the wall of the concha. If the pressure relief hole 214 is close to the feature point, it may cause the pressure relief hole 214 to be blocked by the concha, resulting in the sound in the rear cavity of the sound generating component not being able to be exported outward through the pressure relief hole 214, thereby affecting the sound listening effect of the earclip-type earphone 200. In some embodiments, in order to ensure that the pressure relief hole 214 is not blocked by the concha, 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 feature point is not less than 7.5 mm.

[0096] In some embodiments, if the pressure relief hole 214 is far from the feature point, on the one hand, it may cause the volume of the housing 211 to be relatively large, which is not convenient for carrying and storing; on the other hand, it may also cause the pressure relief hole 214 to be too close to the connection position between the housing 211 and the earhook 230, and the structural design at this connection position is relatively complex or more, which is not convenient for arranging the pressure relief hole 214. In order to ensure that it is convenient to arrange the pressure relief hole 214 on the housing 211 and / or the volume of the earclip-type 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 feature point is not greater than 9.5 mm.

[0097] In some embodiments, in order to take into account that the pressure relief hole 214 is not blocked by the concha and it is convenient to arrange the pressure relief hole 214 on the housing 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 feature point is in the range of 7.5 mm - 9.5 mm.

[0098] In some embodiments, the pressure relief hole 214 may be provided on the inner side of the earhook 230 (i.e., the side facing the ear in the wearing state). The curvature of the arc structure near the position where the pressure relief hole 214 is located is relatively large, and this section of the arc structure will form a "concave pit", so as to ensure that the pressure relief hole 214 will not be blocked by the ear in the wearing state, and further ensure the pressure relief effect of the pressure relief hole 214. In some embodiments, a microphone hole may also be provided on the side of the earhook 230 opposite to the pressure relief hole 214. In this setting mode, when the earclip-type earphone 200 is in the wearing state, the microphone hole is located on the side of the earhook 230 facing the tragus, thereby improving the sound collection effect of the earclip-type earphone 200; at the same time, setting the pressure relief hole 214 and the microphone hole opposite to each other can also reduce the mutual interference between the pressure relief hole 214 and the microphone hole.

[0099] Figure 4B is a schematic diagram of the projection of the earclip-type earphone shown in some embodiments of this specification on the first symmetry plane. Refer to Figure 4B In some embodiments, in the first symmetry plane 300, the earhook 230 forms a third projection 230'. In some embodiments, the third projection 230' includes an inner contour curve and an outer contour curve. Among them, the inner contour curve corresponds to the contour of the earhook 230 on the side close to the helix in the wearing state, and the outer contour curve corresponds to the contour of the earhook 230 on the side far from the helix in the wearing state. In some embodiments, there is at least one point F on the inner contour curve of the third projection 230' that is the farthest from the first projection point A. In some embodiments, when there are multiple points that are the farthest from the first projection point A, at this time, the point among these farthest points that is closest to the second projection 220' of the abutting portion 220 can be used as the second feature point F. The second feature point F can be determined by tools, programs, etc. For example, by inputting the contour curve parameters of the earclip-type earphone 200 (such as the simulated curve function of the inner contour of the earclip-type earphone 200, the simulated curve function of the outer contour of the earclip-type earphone 200, etc.), the corresponding tools, programs, etc. can determine the information of the first projection point A, so as to output the information of the second feature point F (such as position, etc.).

[0100] In some embodiments, in the wearing state, point A is located near the contact point between the sound generating part 210 and the concha, the helix is located within the area enclosed by the inner contour of the earhook 230, and is basically located in the area of the inner contour of the earhook 230 that is the farthest from point A. In order to enable the earclip-type earphone 200 to bypass the user's tragus without squeezing or interfering with the tragus, by designing the first projection point A and the second feature point F, it can be ensured that the earhook 230 of the earclip-type earphone 200 can bypass a large proportion of users' ears in the wearing state, making the earclip-type earphone 200 applicable to more people.

[0101] If the distance between the first projection point A and the second feature point F is too small, the ear hook 230 may squeeze and interfere with the helix of a large number of user groups during the wearing state, affecting the wearing comfort and the clamping effect. If the distance between the first projection point A and the second feature point F is too large, the overall size of the ear hook 230 will be too large, and the earclip-type earphone 200 is likely to have a problem of unstable clamping.

[0102] In some embodiments, in order to enable the ear hook 230 to bypass the ears of a large proportion of user groups, and at the same time enable the ear hook 230 to have a suitable size and avoid the problem of unstable clamping, the distance between the first projection point A and the second feature point F (that is, Figure 4B the length of the line segment AF shown) can be 15 mm - 20 mm.

[0103] Define the connection line between the first projection point A and the second feature point F as the first connection line. Draw a first auxiliary line L4 from the second feature point F to the side deviating from the first projection 210'. The first included angle between the first auxiliary line L4 and the first connection line (that is, the connection 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 feature point. The connection line FG between the fourth feature point G and the second feature point F is the second connection line. The second connection line (that is, the connection line FG) is collinear with the first auxiliary line L4. The part of the ear hook 230 corresponding to the second connection line FG (for example, the part corresponding to the arc FG segment) is arranged on the side of the second connection line FG away from the abutting part 220 to avoid interference between the ear hook 230 and the antihelix and helix.

[0104] In some embodiments, if the included angle (that is, ∠AFG) between the second connection line FG and the first connection line AF is too small, it may cause interference and extrusion between the inner contour of the part of the ear hook 230 corresponding to the second connection line FG and the part from the helix to the concha of the user's ear. If the included angle between the second connection line FG and the first connection line AF is too large, it may cause the size of the ear hook 230 to be too large, resulting in interference between the sound generating part 210 and the tragus of the user or blocking the user's ear canal opening.

[0105] In some embodiments, in order to avoid the sound generating part 210 blocking the user's ear canal opening and avoid interference between the sound generating part 210 and the tragus or the antihelix and helix, the first preset value range can be 30° - 40°, that is, the first included angle between the second connection line FG and the first connection line AF can be 30° - 41°.

[0106] In some embodiments, the inner contour curve portion (i.e., arc FG) of the third projection 230' corresponding to the second connection line FG has a first arc length, and the ratio between the first arc length and the length of the second connection line FG can be defined as the first arc-chord ratio. The first arc-chord ratio can reflect the smoothness of the arc FG corresponding to the second connection line FG. The larger the first arc-chord ratio, the greater the convexity of the arc FG corresponding to the second connection line FG, the larger the area of the region within the arc FG, and the less likely the corresponding part of the earhook 230 is to interfere with the part of the ear from the helix to the concha. The smaller the first arc-chord ratio, the smoother the arc FG corresponding to the second connection line FG, the smaller the area of the region within the arc FG, and the corresponding part of the earhook 230 may interfere with the part of the ear from the helix to the concha (such as the helix and the antihelix). In some embodiments, in order to avoid interference between the earhook 230 and the helix and the antihelix, the first arc-chord ratio can be greater than 1.05.

[0107] If the first arc-chord ratio is too large, it may cause the size of the earhook 230 to be too large, resulting in an overly large overall size of the earclip-type earphone 200, affecting the wearing effect and reducing portability. In some embodiments, in order to make the overall size of the earclip-type earphone 200 appropriate, the first arc-chord ratio can be less than 1.25. In some embodiments, in order to balance the overall size and wearing effect of the earclip-type earphone 200, the first arc-chord ratio is 1.05 - 1.25.

[0108] On the inner contour curve of the third projection 230' and the contour of the first projection 211', with the fourth feature point G as the center, a second arc segment (such as arc GP1) and a third arc segment (such as arc GP2) are respectively determined on both sides of the G point. 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 preset arc length range. The connection line (i.e., connection line P1P2) between the end (i.e., point P1) of the second arc segment (i.e., arc GP1) far from the fourth feature point G and the end (i.e., point P2) of the third arc segment (i.e., arc GP2) far from the fourth feature point E is defined as the third connection line. In some embodiments, the projection of the pressure relief hole 214 on the first symmetry plane 300 can be arranged on the arc segment (i.e., arc P1P2) corresponding to the third connection line P1P2. In some embodiments, the ratio of the second arc length of the arc P1P2 corresponding to the third connection line P1P2 to the length of the third connection line P1P2 is defined as the second arc-chord ratio. The larger the second arc-chord ratio, the greater the bending degree of the corresponding arc P1P2, and the higher the depression degree of the inner contour near the connection position between the sound generating part 210 corresponding to the arc P1P2 and the earhook 230. The smaller the second arc-chord ratio, the smoother the corresponding arc P1P2, and the lower the depression degree of the inner contour near the connection position between the sound generating part 210 corresponding to the arc P1P2 and the earhook 230.

[0109] 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 prevent the pressure relief hole 214 from being blocked by the auricle in the wearing state, 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 generating part 210 corresponding to the arc P1P2 and the ear hook 230 has sufficient depression, so that the pressure relief hole 214 provided at this depression position can be unblocked by the auricle.

[0110] In some embodiments, in order 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, in order to prevent the connection between the sound generating part 210 and the ear hook 230 from being too thin and affecting the connection strength, the depression position should not be too deep, and the second arc chord ratio can be less than 1.44, that is, the second arc chord ratio can be 1.26 - 1.44.

[0111] 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 (such as 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 (such as 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 both sides of the first diaphragm along its vibration direction, and the first sound transmission channel is equivalent to the front cavity of the first sound driver. At the same time, the first sound transmission channel and the second magnetic circuit assembly are also respectively located on both sides of the second diaphragm along its vibration direction, and the first sound transmission channel is also equivalent to the front cavity of the second sound driver. The first sound transmission channel serves as the front cavity of both the first sound driver and the second sound driver at the same time. Therefore, the first sound transmission channel is a common front cavity for the first sound driver and the second sound driver.

[0112] Figure 5 is an exemplary structural diagram of the sound generating part shown in some embodiments of this specification. Refer to Figure 5 In some embodiments, the sound generating assembly 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 assembly (for example, a first magnet 21212 and a first magnetic shield 21213 that are successively 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 assembly (for example, a second magnet 21222 and a second magnetic shield 21223 that are successively away from the second diaphragm 21221) disposed on one side of the second diaphragm 21211 along its vibration direction.

[0113] In some embodiments, the first sound driver 2121 and the second sound driver 2122 are disposed opposite to each other. The two sound drivers being disposed opposite to each other means that the first diaphragm 21211 of the first sound driver 2121 and the second diaphragm 21221 of the second sound driver 2122 are disposed opposite to each other. In some embodiments, the front sides of the first diaphragm 21211 of the first sound driver 2121 and the second diaphragm 21221 of the second sound driver 2122 are disposed opposite to each other. At this time, a first sound transmission channel 400 may be formed between the first diaphragm 21211 and the second diaphragm 21221. The first sound transmission 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), and 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). At this time, the first sound transmission channel 400 is equivalent to the front cavity of the first sound 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). At this time, the first sound transmission channel 400 is also equivalent to the front cavity of the second sound driver 2122. The first sound transmission channel 400 serves as the front cavity of both the first sound driver 2121 and the second sound driver 2122. Therefore, the first sound transmission channel 400 is a common front cavity for the first sound driver 2121 and the second sound driver 2122.

[0114] In some embodiments, the sound outlet hole 213 may be acoustically communicated with the first sound transmission channel 400. The sound generated on the front side of the first diaphragm 21211 and the sound generated on the front side of the second diaphragm 21221 are radiated to the outside through the first sound transmission channel 400 and the sound outlet hole 213. When the two sound drivers share a common front cavity, the sound waves in the front cavities of the two sound drivers can be led out of the housing of the sound generating part through the same sound outlet hole, thereby simplifying the overall structure of the sound generating part and reducing the manufacturing cost of the sound generating part. In some embodiments, since the sound generating assembly 212 includes two sound drivers, this may cause the volume of the accommodation cavity occupied by the two sound drivers to be relatively large. By providing the first sound driver 2121 and the second sound driver 2122 to share a common front cavity, the volume occupied by the two sound drivers can be reduced, facilitating the arrangement of other structures (such as a battery) in the accommodation cavity. In addition, when the two diaphragms work together, the influence on the sound pressure change in the first sound transmission channel is greater. With the cross-sectional area of the sound outlet hole remaining unchanged, the two sound drivers working together can increase the volume of the sound led out through the sound outlet hole, thereby improving the sound effect.

[0115] In some embodiments, the first sound driver 2121 may include a first magnet 21212, a first magnetic shield 21213, and a first chassis for support, which are sequentially arranged away from the first diaphragm 21211. The first chassis 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 chassis for support, which are sequentially arranged away from the second diaphragm 21221. The second chassis is provided with a plurality of ventilation holes.

[0116] The first magnetic shield 21213 has an open end and a closed end, and the open end of the first magnetic shield 21213 faces the first diaphragm 21211. The first magnet 21212 is located inside the first magnetic shield 21213, and one end of the first magnet 21212 facing away from the first diaphragm 21211 is connected to the inner wall of the closed end of the first magnetic shield 21213. The first chassis surrounds the first diaphragm 21211, and a first mounting hole is formed at one end of the first chassis facing away from the first diaphragm 21211. The first magnetic shield 21213 passes through the first mounting hole, and the outer sidewall of the first magnetic shield 21213 is connected to the hole wall of the first mounting hole. The first chassis, the first magnetic shield 21213, and the first diaphragm 21211 together form a cavity as the rear 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 faces the second diaphragm 21221. The second magnet 21222 is located inside the second magnetic shield 21223, and one 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. The second chassis surrounds the second diaphragm 21221, and a second mounting hole is formed at one end of the second chassis facing away from the second diaphragm 21221. The second magnetic shield 21223 passes through the second mounting hole, and the outer sidewall of the second magnetic shield 21223 is connected to the hole wall of the second mounting hole. The second chassis, the second magnetic shield 21223, and the second diaphragm 21221 together form a cavity as the rear cavity of the second sound driver 2122.

[0117] Magnets (including the first magnet 21212 and the second magnet 21222) can be used to generate a magnetic field. When the magnetic field strength generated by the magnets changes, the corresponding diaphragm will be subjected to a force change, resulting in the vibration of the corresponding diaphragm. 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 magnetic leakage of the magnetic circuit components (such as magnets, etc.) of the sound driver. The chassis is mainly used to support and fix the components of the sound driver (such as magnets and magnetic shields).

[0118] In some embodiments, the materials for manufacturing the first magnetic shield 21213 and the second magnetic shield 21223 may include one or a combination of low-carbon steel, silicon steel sheets, ferrosilicon sheets, and ferrite. In some embodiments, the first magnet 21212, the first magnetic shield 21213, and the first chassis may be the same as or similar to the second magnet 21222, the second magnetic shield 21223, and the second chassis.

[0119] In some embodiments, the first chassis and the first magnetic shield 21213 may be connected by means such as bonding, snap connection, welding, riveting, etc. For example, the connection between the first chassis and the first magnetic shield 21213 may be fixedly connected by a sealant. The second chassis and the second magnetic shield 21223 may also be connected by the same or similar connection means as in the foregoing embodiments.

[0120] In some embodiments, the first sound driver 2121 further includes a first magnetic guide plate 21214 disposed within the first chassis. The first magnetic guide plate 21214 is connected to the side of the first magnet 21212 close to the first diaphragm 21211 and is used 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 guide plate 21224 disposed within the second chassis. The second magnetic guide plate 21224 is connected to the side of the second magnet 21222 close to the second diaphragm 21221 and is used to adjust the distribution of the magnetic field generated by the second magnet 21222. In some embodiments, the first magnetic guide plate 21214 and the second magnetic guide plate 21224 may be the same as or similar to each other.

[0121] In some embodiments, the first sound driver 2121 further includes a first coil 21215 disposed within the first chassis. The first coil 21215 is disposed around the side wall of the first magnet 21212. When an electric current is passed through the first coil 21215 (for example, an electric current is passed through the first coil 21215 via a pad on the first chassis), the first coil 21215 can vibrate under the action of the magnetic field and drive the first diaphragm 21211 to vibrate. Similarly, the second sound driver 2122 further includes a second coil 21225 disposed within the second chassis. The second coil 21225 is disposed around the side wall of the second magnet 21222. When an electric current is passed through the second coil 21225 (for example, an electric current is passed through the second coil 21225 via a pad on the second chassis), the second coil 21225 can vibrate under the action of the magnetic field and drive the second diaphragm 21221 to vibrate. In some embodiments, the first coil 21215 and the second coil 21225 may be the same as or similar to each other.

[0122] In some embodiments, a second sound transmission channel may be formed between the first basin frame and the second basin frame. The side of the first diaphragm 21211 away from the first sound transmission channel 400 communicates with the second sound transmission channel through the air vents on the first basin frame. The side of the second diaphragm 21221 away from the first sound transmission channel 400 communicates with the second sound transmission channel through the air vents on the second basin frame. Only as an example, there are gaps between the end face of the first basin frame facing away from the first diaphragm 21211 and the inner wall of the housing 211, and between the end face of the second basin frame facing away from the second diaphragm 21221 and the inner wall of the housing 211. Therefore, a second sound transmission channel can be formed between the first basin frame, the second basin frame, and the housing 211, and the cavities near the end face of the first basin frame facing away from the first diaphragm 21211 and the cavities near the end face of the second basin frame facing away from the second diaphragm 21221 can be acoustically connected. The side of the first diaphragm 21211 away from the first sound transmission channel 400, the first basin frame, and the first magnetic shield 21213 form the rear cavity of the first sound driver 2121. The side of the second diaphragm 21221 away from the first sound transmission channel 400, the second basin frame, and the second magnetic shield 21223 form the rear cavity of the second sound driver 2122. The rear cavity of the first sound driver 2121 and the rear cavity of the second sound driver 2122 can be acoustically connected to the second sound transmission channel through the air vents on the first basin frame and the air vents on the second basin frame respectively, which is equivalent to a common rear cavity for the first sound driver 2121 and the second sound driver 2122. In some embodiments, the air vents may also be provided on the magnetic shield. The first magnetic shield 21213 and the second magnetic shield 21223 are respectively provided with a plurality of air vents. The rear cavity of the first sound driver 2121 is acoustically connected to the second sound transmission channel through the air vents on 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 air vents on the second magnetic shield 21223. In this setting, an effect the same as or approximately the same as that of setting the air vents on the basin frame can also be achieved.

[0123] In some embodiments, the ventilation holes on the two speaker frames are acoustically communicated with the pressure relief holes 214 on the housing 211. The rear cavities of the first sound driver 2121 and the second sound driver 2122 are acoustically communicated. The air flow in the rear cavities of the two sound drivers can be led out to the same pressure relief hole (for example, the pressure relief hole 214) through the corresponding ventilation holes, and then led out of the housing 211 through the same pressure relief hole, so as to simplify the overall structure of the sound generating part 210 and reduce the manufacturing cost of the sound generating part 210. In some embodiments, since the sound generating assembly 212 includes two sound drivers, this may cause the volume of the accommodation cavity occupied by the two sound drivers to be relatively large. By arranging 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, facilitating the arrangement of other structures (such as a battery) in the accommodation 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 arranged on the sound outlet hole 213 and / or the second sound transmission channel. The waterproof and breathable membrane can play a role in waterproofing and dustproofing while ensuring the sound quality of the earclip-type earphone 200, increasing the reliability of the earclip-type earphone 200.

[0124] In some embodiments, when the sound generating part 210 (or the sound generating part 1410 in the following text) includes two sound drivers, the diaphragms of the two sound drivers can 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 resonance frequencies of the first diaphragm 21211 and the second diaphragm 21221 can both be lower than 300 Hz, and the difference between the resonance frequencies of the first diaphragm 21211 and the second diaphragm 21221 is less than 50 Hz. The resonance frequency of the diaphragm refers to the first resonance peak that appears in the order of increasing frequency when the diaphragm is subjected to frequency sweeping processing, corresponding to the position where the diaphragm impedance curve increases. It should be noted that considering the acoustic characteristics of the double diaphragms, the resonance peak frequencies of the two diaphragms in the embodiments of this specification are both lower than 300 Hz, for example, 200 Hz to 300 Hz, which can better display the low-frequency part of the sound signal, thereby providing a better music effect. In addition, when the first diaphragm 21211 and the second diaphragm 21221 are the same, there is no need to separately manufacture the first diaphragm 21211 and the second diaphragm 21221, which can reduce the types of manufacturing materials, reduce costs and production difficulties.

[0125] Figure 6 is an exemplary structural diagram of a pressure relief hole shown in some embodiments of this specification. Refer to Figure 6, in some embodiments, the pressure relief hole 214 may extend along a direction perpendicular to the first symmetry plane 300. For example, the outer end face of the pressure relief hole 214 may be a strip-shaped structure that extends along 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 face of the pressure relief hole 214). In some embodiments, the ventilation holes on the first speaker frame and the ventilation holes on the second speaker frame may be located on both sides of the first symmetry plane 300 respectively. For example, the ventilation holes on the first speaker frame are located on one side of the first symmetry plane 300, and the ventilation holes on the second speaker frame are located on the other side of the first symmetry plane 300.

[0126] In some embodiments, the two ends of the pressure relief hole 214 may extend to the ventilation holes on the two speaker frames respectively. Specifically, it can be understood that the end of the pressure relief hole 214 extends to the position where the distance between the center of the end and the center of the nearest ventilation hole is the shortest. This setting method can enable the sound coming out of the ventilation hole to reach the pressure relief hole 214 through the shortest path, and then be led out to the outside of the housing 211.

[0127] In some embodiments, the outer end face of the pressure relief hole 214 may be symmetric about the first symmetry plane 300. As can be seen from the above, the sound generating assembly 212 includes two sound drivers, and the sound generating assembly 212 as a whole is a symmetric structure. For example, ventilation holes are provided on both the first speaker frame and the second speaker frame, and the sound in the rear cavity of the first sound driver and the sound in the rear cavity of the second sound driver are respectively led out to the pressure relief hole 214 through the corresponding ventilation holes. By setting the outer end face of the pressure relief hole 214 to be symmetric about the first symmetry plane 300, the path for the sound in the rear cavity of the first sound driver to be led out to the pressure relief hole 214 through the ventilation hole on the first speaker frame can be made equal to or approximately equal to the path for the sound in the rear cavity of the second sound driver to be led out to the pressure relief hole 214 through the ventilation hole on the second speaker frame, so as to ensure that the amplitude or phase of the sound in the rear cavity of the first sound driver and the sound in the rear cavity of the second sound driver led out to the outside of the housing 211 through the pressure relief hole 214 are the same or substantially the same (or the changes in the amplitude and phase of the two sounds are substantially the same).

[0128] 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".

[0129] In some embodiments, the sound generating component 212 may include a mounting bracket, and a first sound driver 2121 and a second sound driver 2122 are mounted on the mounting bracket. For example, the first speaker frame is connected to the mounting bracket. The first magnetic conductive plate 21214, the first magnet 21212, the first magnetic conductive cover 21213, and the first diaphragm 21211 of the first sound driver 2121 are all connected to the mounting bracket through the first speaker frame. That is, the first sound driver 2121 is mounted on the mounting bracket through the first speaker frame. Similarly, the second speaker frame is connected to the mounting bracket. The second magnetic conductive plate 21224, the second magnet 21222, the second magnetic conductive cover 21223, and the second diaphragm 21221 of the second sound driver 2122 are all connected to the mounting bracket through the second speaker frame. That is, the second sound driver 2122 is mounted on the mounting bracket through the second speaker frame. In some cases, since both the first sound driver 2121 and the second sound driver 2122 are 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 some structures on the mounting bracket can jointly enclose a first transmission channel cavity with the first acoustic driver 2121 and the second acoustic driver 2122. In this way, the overall structure of the sound generating part 210 can be simplified, and the manufacturing cost of the sound generating part 210 can be reduced. Moreover, only by designing the mounting bracket can the common cavity of the first sound driver 2121 and the second sound driver 2122 be adjusted, avoiding the influence of the complex structure in the housing 211 on the acoustic effect of the common cavity. Based on the above setting method of the mounting bracket, in some embodiments, the mounting bracket will block a partial area of the middle section of the pressure relief hole 214 (that is, the area on the pressure relief hole 214 except for the two end portions) (the area shown by the dotted line frame M in the figure), and the area of the pressure relief hole 214 blocked by the mounting bracket cannot conduct sound to the outside. By setting the two end portions of the pressure relief hole 214 to have a larger opening size than the middle section, the end portions of the pressure relief hole 214 have a larger opening size, so that the sound coming out of the vent hole can be more smoothly conducted to the outside through the end portions of the pressure relief hole 214.

[0130] In some embodiments, the first maximum distance between the pressure relief hole 214 and the ventilation holes on the first basin frame (or the first magnetic conductive cover 21213) may be the same as or approximately the same as the second maximum distance between the pressure relief hole 214 and the ventilation holes on the second basin frame (or the second magnetic conductive cover 21223). For example, the ratio of the difference between the first maximum distance and the second maximum distance to the first maximum distance is less than 10%. In this setting, it can effectively prevent the distance between the ventilation holes of one of the sound drivers and the pressure relief hole 214 from being too large, thereby affecting the overall sound quality of the sound generating part 210. In some embodiments, the maximum distance (the first maximum distance or the second maximum distance) between the pressure relief hole 214 and the ventilation holes (the ventilation holes of the first sound driver 2121 or the ventilation holes of the second sound driver 2122) may be less than 0.5 mm.

[0131] In some embodiments, the rear cavity (the rear cavity of the first sound driver or the rear cavity of the second sound driver) of the sound generating part 210 has a first resonance frequency. By adjusting the area of the pressure relief hole 214, the adjustment of the first resonance frequency can be achieved. The front cavity (the front cavity of the first sound driver or the front cavity of the second sound driver) of the sound generating part 210 has a second resonance frequency. By adjusting the area of the sound outlet hole 213, the adjustment of the second resonance frequency can be achieved.

[0132] Figure 7 is the frequency response curve of the rear cavity corresponding to different areas of the pressure relief hole shown in some embodiments of this specification. Among them, the horizontal axis represents frequency, with the unit of Hz; the vertical axis represents sound pressure level, with the unit of dB. Figure 7 The different curves in represent, under the condition that the area of the sound outlet hole (such as the sound outlet hole 213) remains unchanged (as an example, the area of the sound outlet hole is 6 mm 2 ), the frequency response curves of the rear cavity corresponding to different areas of the pressure relief hole (such as the pressure relief hole 214). Curve 810 represents the frequency response curve of the rear cavity when the area of the pressure relief hole is 1.5 mm 2 ; Curve 820 represents the frequency response curve of the rear cavity when the area of the pressure relief hole is 3 mm 2 ; Curve 830 represents the frequency response curve of the rear cavity when the area of the pressure relief hole is 4.5 mm 2 ; Curve 840 represents the frequency response curve of the rear cavity when the area of the pressure relief hole is 6 mm 2 ; Curve 850 represents the frequency response curve of the rear cavity when the area of the pressure relief hole is 7.5 mm 2 . From Figure 7As can be seen, each curve has two resonance peaks, and the two resonance peaks correspond to different resonance frequencies respectively. Taking curve 810 as an example, curve 810 has a first resonance peak and a second resonance peak. The first resonance frequency f1 corresponding to the first resonance peak is approximately 3000 Hz, and the second resonance frequency f2 corresponding to the second resonance peak is approximately 5900 Hz. By comparing each curve, it can be known that the second resonance frequencies corresponding to the second resonance peaks of each curve are basically the same (about 5900 Hz), which is because the areas of the sound outlet holes are the same. When the areas of the sound outlet holes are the same, the second resonance frequencies of the front cavities are basically the same. By comparing each curve, the magnitude relationship of the first resonance frequencies corresponding to the first resonance peaks of each curve is that 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 from this 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.

[0133] Figure 8 are the frequency response curves of the front cavity corresponding to different areas of the sound outlet hole shown in some embodiments of this specification. Among them, the horizontal axis represents frequency, with the unit of Hz; the vertical axis represents sound pressure level, with the unit of dB. Figure 8 The different curves in show respectively that, under the condition that the area of the pressure relief hole (such as the pressure relief hole 214) remains unchanged (as an example, the area of the pressure relief hole is 6 mm 2 ), the frequency response curves of the front cavity corresponding to different areas of the sound outlet hole (such as the sound outlet hole 213). Curve 910 represents the frequency response curve of the front cavity when the area of the sound outlet hole is 3 mm 2 ; curve 920 represents the frequency response curve of the front cavity when the area of the sound outlet hole is 4.5 mm 2 ; curve 930 represents the frequency response curve of the front cavity when the area of the sound outlet hole is 6 mm 2 ; curve 940 represents the frequency response curve of the front cavity when the area of the sound outlet hole is 7.5 mm 2 ; curve 950 represents the frequency response curve of the front cavity when the area of the sound outlet hole is 9 mm 2 . From Figure 8As can be seen, each curve has two resonance peaks, and the two resonance peaks correspond to different resonance frequencies respectively. Taking curve 910 as an example, curve 910 has a first resonance peak and a second resonance peak. The first resonance frequency f1 corresponding to the first resonance peak is about 4400 Hz, and the second resonance frequency f2 corresponding to the second resonance peak is about 4600 Hz. By comparing each curve, it can be known that the first resonance frequencies corresponding to the first resonance peaks of each curve are basically the same (about 4200 Hz), which is because the areas of the pressure relief holes are the same. With the same area of the pressure relief holes, the first resonance frequencies of the rear cavity are basically the same. By comparing each curve, the magnitude relationship of the second resonance frequencies corresponding to the second resonance peaks of each curve is that 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 from this that within a certain range, as the area of the sound outlet hole increases, the second resonance frequency corresponding to the second resonance peak of the curve gradually increases.

[0134] In some embodiments, the second resonance frequency of the front cavity is greater than the first resonance frequency of the rear cavity. When the gap between the second resonance frequency of the front cavity and the first resonance frequency of the rear cavity is large, a trough will be formed between the corresponding second resonance peak and the first resonance peak, resulting in unsatisfactory sound in the mid-high frequency range (for example, 3000 Hz - 5000 Hz). Taking Figure 7 curve 810 in it as an example, the first resonance frequency f1 corresponding to the first resonance peak is about 3000 Hz, the second resonance frequency f2 corresponding to the second resonance peak is about 5900 Hz, the difference between the second resonance frequency and the first resonance frequency is about 1900 Hz, and a large trough is formed between the two resonance peaks, resulting in a small sound pressure level in the frequency range near 4000 Hz and unsatisfactory sound. When the gap between the second resonance frequency of the front cavity and the first resonance frequency of the rear cavity is small, the distance between the corresponding second resonance peak and the first resonance peak is too small or even overlaps, which causes the falling speed of the frequency response curve in the high frequency to be too fast, resulting in weak high frequency response. Taking Figure 8Taking the curve 910 in [description] as an example, the first resonance frequency f1 corresponding to the first resonance peak is approximately 4400 Hz, the second resonance frequency f2 corresponding to the second resonance peak is approximately 4600 Hz, the difference between the second resonance frequency and the first resonance frequency is approximately 200 Hz, and the distance between the two resonance peaks is too small. In the frequency band higher than 4600 Hz, the descent speed of the curve 910 is too fast, resulting in a weak high-frequency response of the curve 910. Based on this, in some embodiments, the area of the sound outlet hole and / or the pressure relief hole can be adjusted so that the difference between the second resonance frequency of the front cavity and the first resonance frequency of the rear cavity is within a suitable range to improve the output effect of the earclip-type earphone 200 in the mid-high frequency range. In some embodiments, the difference between the second resonance frequency of the front cavity and the first resonance frequency of the rear cavity can be within the range of 0.5 KHz - 1.5 KHz. In some embodiments, the area of the sound outlet hole and / or the pressure relief hole can be adjusted so that the difference between the second resonance frequency of the front cavity and the first resonance frequency of the rear cavity is within the range of 0.7 KHz - 1.3 KHz. In some embodiments, the area of the sound outlet hole and / or the pressure relief hole can be adjusted so that the difference between the second resonance frequency of the front cavity and the first resonance frequency of the rear cavity is within the range of 0.9 KHz - 1.1 KHz.

[0135] In some embodiments, by adjusting the area of the pressure relief hole, the first resonance frequency of the rear cavity can be made higher than 4.5 KHz. In this setting, on the one hand, it can ensure that the difference between the second resonance frequency of the front cavity and the first resonance frequency of the rear cavity is within a suitable 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 interval of the frequency response curve is larger), so that the phase and amplitude of the sound derived from the front cavity through the sound outlet hole 213 and the sound derived from the rear cavity through the pressure relief hole 214 are relatively stable in the mid-low frequency range, such as the phases are approximately opposite and the amplitudes are approximately equal, thereby strengthening the interference cancellation in the far field of the sound output through the pressure relief hole 214 and the sound output through the sound outlet hole 213 and reducing the far-field sound leakage of the earclip-type earphone 200.

[0136] In some embodiments, by adjusting the area of the sound outlet hole, the second resonance frequency of the front cavity can be made lower than 6 KHz. In this setting, on the one hand, it can ensure that the difference between the second resonance frequency of the front cavity and the first resonance frequency of the rear cavity is within a suitable range; on the other hand, it can also ensure that the earclip-type earphone 200 has better performance in the mid-high frequency range.

[0137] In some embodiments, in order to ensure that the second resonance frequency of the front cavity is lower than 6 KHz, the area of the sound outlet hole can be no more than 18 mm 2 . In some embodiments, in order to ensure that the low-frequency volume is large enough, the area of the sound outlet hole can be no less than 5 mm 2。In some embodiments, to balance the second resonance frequency and the low-frequency volume, the area of the sound outlet hole can be in the range of 5 mm 2 -18 mm 2 。In some embodiments, to balance the second resonance frequency and the low-frequency volume, the area of the sound outlet hole can be in the range of 8 mm 2 -16 mm 2 。

[0138] In some embodiments, the volume of the front cavity can affect the second resonance frequency. When the area of the sound outlet hole is the same, the second resonance frequency is negatively correlated with the volume of the front cavity. Specifically, the larger the volume of the front cavity, the lower the second resonance frequency; the smaller the volume of the front cavity, the higher the second resonance frequency. In some embodiments, to ensure that the second resonance frequency can be within a suitable range, the volume of the front cavity can be in the range of 60 mm 3 -120 mm 3 。In some embodiments, to ensure that the second resonance frequency can be within a suitable range and to make the sound generating part 210 have a suitable size, the volume of the front cavity can be in the range of 80 mm 3 -100 mm 3 。

[0139] In some embodiments, to ensure that the first resonance frequency of the rear cavity is higher than 4.5 KHz, the area of the pressure relief hole can be in the range of 6 mm 2 -15 mm 2 。In some embodiments, the volume of the rear cavity can affect the first resonance frequency. When the area of the pressure relief hole is the same, the first resonance frequency is negatively correlated with the volume of the rear cavity. Specifically, the larger the volume of the rear cavity, the lower the first resonance frequency; the smaller the volume of the rear cavity, the higher the first resonance frequency. In some embodiments, to ensure that the first resonance frequency can be within a suitable range, the volume of the rear cavity can be in the range of 80 mm 3 -180 mm 3 。In some embodiments, to ensure that the first resonance frequency can be within a suitable range and to make the sound generating part 210 have a suitable size, the volume of the rear cavity can be in the range of 100 mm 3 -160 mm 3 。It should be noted that the area of the pressure relief hole here can refer to the equivalent total area of the pressure relief holes. For example, when the number of pressure relief holes is one, the area of the pressure relief hole here is the area of one pressure relief hole; when the number of pressure relief holes is multiple, the area of the pressure relief hole here is the sum of the areas of multiple pressure relief holes.

[0140] Figure 9 is an exemplary structural diagram of the housing shown in some embodiments of this specification. Refer to Figure 9, the housing 211 may include a first rigid housing 2111, a second rigid housing 2112 configured to face the concha of the wearer when worn, and a first flexible body 2113 configured to contact the concha of the wearer. In some embodiments, the rigid material may be plastic, metal, or other support materials that can be used as the headphone housing to provide better support and stability for the internal structure (such as the sound generating component) of the housing 211. In some embodiments, the first rigid housing 2111 and the second rigid housing 2112 enclose a receiving cavity 2114, and the sound generating component is disposed in the receiving cavity 2114. The first flexible body 2113 covers the outer wall of the second rigid housing 2112, and the first flexible body 2113 may be made of silicone or other skin-friendly flexible materials to improve the comfort when the sound generating part 211 contacts the wearer.

[0141] In some embodiments, the first rigid housing 2111 and the second rigid housing 2112 can provide better support to support the internal structure. In the worn state, the second rigid housing 2112 can face the concha of the wearer and will contact the wearer. In the embodiments of this specification, covering the first flexible body 2113 on the outer wall of the second rigid housing 2112 can improve the comfort of wearing the headphones.

[0142] In some embodiments, the first flexible body 2113 covers the outer wall of the second rigid housing 2112, and the first flexible body 2113 basically does not affect the external structure and internal space of the first rigid housing 2111, ensuring the utilization rate of the internal space of the first rigid housing 2111. Specifically, the first flexible body 2113 is coated on the outer wall of the second rigid housing 2112, so the second rigid housing 2112 has a double-layer wall thickness in part. The outer wall of the housing 211 is not coated with the first flexible body 2113 or only a part close to the first rigid housing 2111 is coated with the first flexible body 2113. Therefore, the first rigid housing 2111 only needs a single-layer wall thickness, making the first rigid housing 2111 occupy a small volume of the receiving cavity 2114 and leaving a large space for the sound generating component, and a sound generating component with a larger oscillator (for example, a sound generating component including two sound drivers) can be placed to form a better acoustic effect.

[0143] In some embodiments, the end of the second rigid housing 2112 and the end of the first rigid housing 2111 can be spliced and fixed. The end of the second rigid housing 2112 and the end of the first rigid housing 2111 are fixed by splicing to form a reliable and small-sized fixing, and this splicing method is also convenient for assembly and reduces the assembly process.

[0144] In some embodiments, the sound outlet 213 may be located on the second hard shell 2112 and the first flexible body 2113. By arranging the sound outlet 213 on the second hard shell 2112 and the first flexible body 2113, the sound outlet 213 does not extend to the first hard shell 2111, which facilitates the splicing and fixing of the ends of the first hard shell 2111 and the second hard shell 2112, thereby improving the accuracy. In addition, under this arrangement, the sound outlet 213 can be prevented from being misaligned, and it is also convenient to install a steel mesh and a sound tuning mesh on the sound outlet 213.

[0145] Figure 10A It is a schematic diagram of the sound field in a free field according to some embodiments of the present specification. Figure 10B It is a schematic diagram of the sound field of the reflection field shown in some embodiments of this specification. Figure 10A and Figure 10B The depth of the medium gray area represents the magnitude of the sound pressure level. The greater the grayscale, the greater the sound pressure level; the lighter the grayscale, the smaller the sound pressure level. In some embodiments, when the sound outlet is not blocked by the concha cavity, the sound field of the sound derived from the sound outlet is a free field, such as Figure 10A In some embodiments, when a portion of the sound outlet (such as the sound outlet 213) is blocked by the concha cavity wall, the concha cavity wall forms a reflective wall surface in the direction of sound propagation near the sound propagation direction, and the reflective wall surface reflects the sound. The sound field of the sound derived from the sound outlet is a reflection field, such as Figure 10B The reflected sound waves in the reflection field and the sound source sound waves (ie, the original sound waves derived from the sound outlet 213) will interfere with each other and diffract to form a sound enhancement area, thereby increasing the sound pressure level of the sound.

[0146] Figure 10C It is a graph of the sound pressure levels of the free field and the reflected field shown in some embodiments of this specification. Among them, 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".

[0147] Figure 11A Schematic diagram of the positional relationship between the sound-emitting part and the reflective wall surface according to some embodiments of this specification. Figure 11A, in some embodiments, the linear distance from the center of the sound - generating part (such as the sound - generating part 210) to the reflecting wall surface can be defined as h, and the included angle between the normal straight line from the center of the sound - emitting hole pointing to the outside and the straight line from the center of the sound - generating part to the reflecting wall surface is θ. Among them, the distance h reflects the distance between the sound - generating part and the concha wall in the wearing state, and the included angle θ reflects the orientation of the sound - emitting hole of the sound - generating part relative to the inner wall of the concha in the wearing state. Different values of the distance h / included angle θ result in different sound - pressure distributions in the reflection field.

[0148] Figure 11B is the sound - pressure level curve graph of the reflection field corresponding to different distances h shown in some embodiments of this specification. Figure 11B The different curves in it respectively represent that, under the condition of the included angle θ = 0°, the sound - pressure level curves corresponding to the distances h being 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm, and 20mm respectively. By comparing each curve, it can be seen that the smaller the distance h (that is, the closer the sound - generating part is to the reflecting wall surface), the greater the sound - pressure level at high frequencies. Corresponding to the structure of the ear - clip type earphone 200 in the previous text, when the ear - clip type earphone 200 is in the wearing state, the outer surface of the housing 211 of the sound - generating part 210 fits on the concha wall, and at least part of the sound - emitting hole 213 is blocked by the concha wall. Therefore, the volume of the ear - clip type earphone 200 led out through the sound - emitting hole 213 and transmitted to the wearer's ear canal entrance can be increased.

[0149] Figure 11C is the sound - pressure level curve graph of the reflection field corresponding to different included angles θ shown in some embodiments of this specification. Figure 11C The different curves in it respectively represent that, under the condition of the distance h = 7.5mm, the sound - pressure level curves corresponding to the included angles θ being 0°, 30°, 60°, 90°, 120°, 150°, 180°, 210°, 240°, 270°, 300°, and 330° respectively. By comparing each curve, it can be seen that when the sound - emitting hole points to the listening point (such as the ear canal entrance) and the reflecting wall surface (in the wearing state), the sound - pressure level of the sound transmitted to the listening point is relatively large.

[0150] Figure 12 is the sound - pressure level curve graph of the reflection field corresponding to different distances h shown in some embodiments of this specification. Figure 12 The different curves in it respectively represent that, under the condition of the included angle θ = 300°, the sound - pressure level curves corresponding to the distances h being 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm, and 20mm respectively. In some embodiments, when the included angle θ is the same, when the sound - generating part is in contact with the reflecting wall surface and the sound - emitting hole is on one side of the contact point (for example, the feature point on the housing 211 in the previous text), the sound - pressure level is the largest. As Figure 12As shown by the solid line curve, when the distance h = 5 mm and the included angle θ = 300°, the sound generating part is in contact with the reflecting wall surface and the sound outlet hole is completely on one side of the contact point. At this time, the sound pressure level is the largest. Corresponding to the structure of the earclip-type earphone 200 in the previous text, when the earclip-type earphone 200 is in the wearing state, the outer surface of the housing 211 of the sound generating part 210 fits on the wall of the concha, and the characteristic points (and the nearby areas) on the housing 211 will be blocked by the wall of the concha. When the sound outlet hole 213 is completely on one side of the characteristic point (for example, Figure 4A the middle arc BC is completely on one side of the first projection point A), it can be ensured that part of the area of the sound outlet hole 213 is blocked by the wall of the concha, and the unblocked area faces the ear canal opening of the wearer, so that the listening volume heard by the wearer is relatively large.

[0151] Figure 13 is a sound pressure level curve diagram corresponding to the same frequency, the same distance h and different included angles θ shown in some embodiments of this specification. Figure 13 In (a)-(f) in Figure 13 respectively represent the sound pressure level curves corresponding to the change of the included angle θ under the condition that the frequency is 2000 Hz and the distance h = 5 mm (that is, the sound generating part is in contact with the reflecting wall surface). Figure 13 The included angles θ corresponding to (a)-(f) in

[0152] Combined with Figures 11A - 13 , the distance h reflects the distance between the sound generating part and the wall of the concha in the wearing state, and the included angle θ reflects the orientation of the sound outlet hole of the sound generating part relative to the wall of the concha in the wearing state. When the distance h and / or the included angle θ are different, the sound pressure distribution of the reflection field is different. Corresponding to the earclip-type earphone 200 in the previous text, in the wearing state, when the distance between the sound generating part 210 of the earclip-type earphone 200 and the wall of the concha, and / or the orientation of the sound outlet hole 213 of the sound generating part 210 relative to the wall of the concha are different, the volume of the sound output by the earclip-type earphone 200 through the sound outlet hole 213 and transmitted to the ear canal opening of the wearer is different. When the outer surface of the housing 211 of the sound generating part 210 fits on the wall of the concha, part of the area of the sound outlet hole 213 is blocked by the wall of the concha, and the sound outlet hole 213 is completely on one side of the characteristic point on the housing 211, it can make the reflection field formed by the sound field of the sound derived through the sound outlet hole 213 stronger, so as to increase the volume of the sound output by the earclip-type earphone 200 through the sound outlet hole 213 and transmitted to the ear canal opening of the wearer.

[0153] Figure 14It is an exemplary structural diagram of another earclip-type earphone shown according to some embodiments of this specification. Figure 14 The structure of the earclip-type earphone 1400 shown in Figure 14 is substantially the same as the structure of the earclip-type earphone 200. For example, the structures of the sound generating part 1410, the abutting part 1420, the ear hook 1430, the housing 1411, and the sound generating assembly 1412 (e.g., the first sound driver 14121, the first diaphragm 141211, the first magnet 141212, the first magnetic shield 141213, and the second sound driver 14122, the second diaphragm 141221, the second magnet 141222, the second magnetic shield 141223) of the earclip-type earphone 1400 are respectively substantially the same as the corresponding structures (such as the sound generating part 210, the abutting part 220, the ear hook 230, the housing 211, and the sound generating assembly 212) in the earclip-type earphone 200. The difference between the structure of the earclip-type earphone 1400 and the structure of the earclip-type earphone 200 lies in the different arrangement ways of the sound outlet holes 1413 and 213. It should be noted that in this embodiment, the sound generating assembly 1412 is described by taking it as including two sound drivers as an example. In other embodiments, the sound generating assembly 1412 may also include only one sound driver.

[0154] In some embodiments, the outer end surface of the sound outlet hole 1413 of the earclip-type earphone 1400 may be strip-shaped, and this outer end surface has a second symmetry plane parallel to the length extension direction of the strip. In some embodiments, the second symmetry plane may be perpendicular to the first symmetry plane 300 of the ear hook 1430. In this arrangement, when the earclip-type earphone 1400 is in a worn state, the sound outlet hole 1413 is not easily blocked by the concha wall, so that the sound derived through the sound outlet hole 1413 can be more transmitted to the wearer's ear canal, improving the listening volume and listening effect.

[0155] In some embodiments, the sound outlet hole 1413 is acoustically connected to the front cavity of the sound generating part 1410, and the sound outlet hole 1413 guides the sound in the front cavity of the sound generating part 1410 to the housing 1411. For example, when the sound generating assembly 1412 includes two sound drivers, a first sound transmission 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 sound transmission channel 1440 forms the front cavity of the two sound drivers or a part of the front cavity. The sound outlet hole 1413 is acoustically connected to the first acoustic channel 1440, and the sound generated on the front sides of the two diaphragms is both guided to the outside of the housing 1411 through the first sound transmission channel 1440 and the sound outlet hole 1413, and is further transmitted to the listening position. Thus, it can be known that whether the sound outlet hole 1413 will be blocked by the concha wall in the wearing state will affect the listening volume heard by the wearer. For example, when the sound outlet hole 1413 is blocked by the concha wall, the sound guided to the outside of the housing 1411 through the sound outlet hole 1413 is small, and the listening volume heard by the wearer is small; when the sound outlet hole 1413 is not blocked by the concha wall, the sound guided to the outside of the housing 1411 through the sound outlet hole 1413 is large, and the listening volume heard by the wearer is large.

[0156] To ensure that the sound outlet hole 1413 is not blocked by the concha wall in the wearing state and improve the listening volume of the wearer, in some embodiments, the position of the sound outlet hole 1413 on the housing 1411 can be set. Combining the foregoing description, a partial area of the housing 1411 that is relatively close to the feature point of the housing 1411 can be blocked by the concha wall, and a partial area of the housing 1411 that is relatively far from the feature point of the housing 1411 is not blocked by the concha wall. Based on this, in order to ensure that the sound outlet hole 1413 is not blocked by the concha wall, the linear distance between the center of the projection of the outer end surface of the sound outlet hole 1413 on the first symmetry plane 300 and the first projection point (for example, the first projection point A) formed by the projection of the feature point on the housing 1411 on the first symmetry plane 300 can be within the range of 7.0 mm - 8.5 mm. The center of the projection of the outer end surface of the sound outlet hole 1413 on the first symmetry plane 300 refers to the centroid of the projection shape formed by the projection of the outer end surface of the sound outlet hole 1413 on the first symmetry plane 300.

[0157] Figure 15 is an exemplary structural diagram of the sound generating part shown in some embodiments of this specification. In some embodiments, such as Figure 15As shown, when the linear distance between the center of the outer end surface of the sound outlet hole 1413 projected onto the first symmetry plane 300 and the first projection point (e.g., the first projection point A) is the shortest, the sound outlet hole 1413 can be located at the first limit position 1413b on the housing 1411. When the linear distance between the center of the outer end surface of the sound outlet hole 1413 projected onto the first symmetry plane 300 and the first projection point (e.g., the first projection point A) is the longest, the sound outlet hole 1413 can be located at the second limit position 1413a on the housing 1411.

[0158] In some embodiments, when the sound generating assembly 1412 includes two sound drivers, since the sound outlet hole 1413 is acoustically connected to the first sound transmission channel 1440, when the position of the sound outlet hole 1413 on the housing 1411 is different, the extending direction of the first sound transmission channel 1440 is different, which means that the direction / angle of the sound generating assembly 1412 (or the diaphragm) in the accommodating cavity is different. In some embodiments, the direction / angle of the sound generating assembly 1412 arranged in the accommodating cavity can be adjusted (it can also be understood that the sound generating assembly 1412 is rotatable relative to the housing 1411). As an example, the way to represent the direction / angle of the sound generating assembly 1412 arranged in the accommodating cavity can be, in the wearing state, the included angle between the symmetry plane of the sound generating assembly 1412 and the horizontal plane. The symmetry plane of the sound generating 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 respectively located on both sides of the symmetry plane of the sound generating assembly 1412. It should be noted that no matter how the direction / angle of the sound generating assembly 1412 arranged in the accommodating cavity changes, the symmetry plane of the sound generating assembly 1412 is always perpendicular to the first symmetry plane 300 of the earhook 1430.

[0159] By adjusting the direction / angle of the sound generating assembly 1412 arranged in the accommodating cavity, the position of the sound outlet hole 1413 on the housing 1411 can be adjusted, so as to ensure that the sound outlet hole 1413 in the wearing state is not blocked by the concha wall, and improve the sound volume heard by the wearer.

[0160] In some embodiments, the sound outlet hole 1413 has a central axis. When the outer end surface of the sound outlet hole 1413 is strip-shaped, the outer end surface has four vertices, forming two diagonals. The axis passing through the intersection point of the two diagonals of the strip-shaped outer end surface and perpendicular to the outer end surface is the central axis of the sound outlet hole 1413. In some embodiments, when the sound generating assembly 1412 includes two sound drivers, the central axis of the sound outlet hole 1413 is located on the symmetry plane between the first diaphragm 141211 and the second diaphragm 141221.

[0161] In some embodiments, the central axis of the sound outlet hole 1413 may be located on the first symmetry plane 300 of the ear hook 1430. At this time, along the length extension direction of the outer end surface of the sound outlet hole 1413, the first symmetry plane 300 divides the outer end surface of the sound outlet hole 1413 into two symmetric or approximately symmetric parts. In this setting mode, the sound outlet hole 1413 can be disposed exactly in the middle of the bottom surface of the housing 1411, so that the sound outlet hole 1413 in the wearing state can point to the ear canal opening of the wearer.

[0162] In some embodiments, the central axis of the sound outlet hole 1413 may also deviate from the first symmetry plane 300. At this time, along the length extension direction of the outer end surface of the sound outlet hole 1413, the outer end surface of the sound outlet hole 1413 is asymmetric with respect to the first symmetry plane. When wearing the earclip-type earphone 1400, due to factors such as the gravity of the earclip-type earphone 1400 or unstable wearing, the earclip-type earphone 1400 may be tilted. By setting the central axis of the sound outlet hole 1413 to deviate from the first symmetry plane 300, the tilt of the earclip-type earphone 1400 caused by factors such as gravity during wearing can be compensated, so that the sound outlet hole 1413 of the tilted earclip-type earphone 1400 can point to the ear canal, thereby ensuring the sound listening effect and volume.

[0163] In some embodiments, when the earclip-type earphone 1400 is in the wearing state, the tilt of the earclip-type earphone 1400 caused by factors such as gravity, the tilt angle (that is, the included angle β in the following text) is usually between 0° and 30°. In some embodiments, in order to ensure that the sound outlet hole 1413 can point to the ear canal when the earclip-type earphone 1400 is tilted, the included angle (i.e., the included angle α in the following text) formed between the central axis of the sound outlet hole 1413 and the first symmetry plane 300 can be in the range of 15° to 45°.

[0164] In some embodiments, the sound outlet hole 1413 may be located on the first rigid housing 2111. By disposing the sound outlet hole 1413 on the first rigid housing 2111, the sound outlet hole 1413 does not extend to the second rigid housing 2112, which is convenient for splicing and fixing the end of the first rigid housing 2111 and the end of the second rigid housing 2112, and improves the accuracy. In addition, in this setting mode, it can also avoid the misalignment of the sound outlet hole 1413, and at the same time, it is convenient to install a steel mesh and a sound adjustment mesh on the sound outlet hole 1413.

[0165] In some embodiments, the clip-on earphone 1400 may include two pressure relief holes (not shown in the figures), and both of the two pressure relief holes are located on the housing 1411 of the sound generating portion 1410. In some embodiments, both of the two pressure relief holes may be provided on the first rigid housing of the housing 1411. In this setting manner, it can be ensured that the distances between the two pressure relief holes and the sound outlet hole 1413 are relatively far, so as to reduce the influence of the sounds output from the two pressure relief holes on the volume of the sound output from the sound outlet hole 1413 at the listening position. In other alternative embodiments, the two pressure relief holes may also be respectively provided on the first rigid housing and the second rigid housing.

[0166] In some embodiments, the acoustic holes (such as sound outlet holes, pressure relief holes, microphone holes, ventilation holes, etc.) provided on the clip-on earphone (such as the clip-on earphone 200, the clip-on earphone 1400) may be fully symmetric. Taking the structure of the clip-on earphone 1400 as an example, the central axis of the sound outlet hole 1413 of the clip-on earphone 1400 may be located on the first symmetry plane 300 of the ear hook 1430. At this time, along the length extension direction of the outer end surface of the sound outlet hole 1413, the first symmetry plane 300 divides the outer end surface of the sound outlet hole 1413 into two symmetric or approximately symmetric parts. When the clip-on earphone 1400 includes two pressure relief holes, the two pressure relief holes may be symmetrically arranged with respect to the first symmetry plane 300. On the one hand, by isolating the rear cavity of the first sound driver 2121 and the rear cavity of the second sound driver 2122, the sound signals output by the two sound drivers can be made not completely the same, so that the clip-on earphone 1400 has a certain frequency division function; on the other hand, by isolating the rear cavity of the first sound driver 2121 and the rear cavity of the second sound driver 2122, the mutual interference between the two sound drivers can also be reduced. In addition, other acoustic holes provided on the clip-on earphone 1400, such as ventilation holes, microphone holes, etc., may also be symmetrically arranged with respect to the first symmetry plane 300 to ensure that the acoustic holes on the clip-on earphone 1400 are fully symmetrically arranged.

[0167] As can be seen from the above, when the second symmetry plane of the sound outlet hole 1413 is perpendicular to the first symmetry plane 300 of the ear hook 1430, by adjusting the position of the sound outlet hole 1413 on the housing 1411, the output volume of the clip-on earphone 1400 at the ear canal opening of the wearer can be adjusted.

[0168] Figure 16 is a schematic diagram of the sound outlet hole setting position and wearing state shown according to some embodiments of this specification. Figure 17 is a schematic diagram of the wearing state at different β angles shown according to some embodiments of this specification. Figure 18 is a frequency response curve graph at the ear canal opening corresponding to different β angles when α is 0 shown according to some embodiments of this specification. Figure 19It is a frequency response curve at the ear canal opening corresponding to different α angles when β is 0 as shown in some embodiments of this specification.

[0169] Referring to Figure 16 and Figure 17 , when the second symmetry plane of the sound outlet (e.g., sound outlet 1413) is perpendicular to the first symmetry plane of the earhook (e.g., earhook 1430) (such as the first symmetry plane 300), the angle between the normal line W from the sound generating part to the outside of the sound outlet and the first symmetry plane 300 of the earhook can be defined as α, and the angle between the first symmetry plane 300 of the earhook and the human horizontal plane is β. As Figure 18 shown, the abscissa represents the frequency (Hz) of the earclip-type earphone, and the ordinate is the measured sound pressure level (dB). Fix α = 0° (i.e., the central axis of the sound outlet is located in the first symmetry plane of the earhook), and adjust the β angle to -20°, 0°, 45° respectively, and measure the frequency response curve of the sound output by the earclip-type earphone at the ear canal opening. From Figure 18 it can be seen that when α = 0°, and β is -20°, the sound pressure level of the measured frequency response curve of the earclip-type earphone is the highest.

[0170] Furthermore, referring to Figure 19 , fix β = 0° (i.e., the wearing state where the first symmetry plane of the earhook is parallel to the human horizontal plane), and adjust the α angle to -30°, -15°, 0°, 15°, 30°, 45°, 60° respectively, and measure the frequency response curve of the sound output by the earphone at the ear canal opening. From Figure 19 it can be seen that when α is in the range of 15° - 45°, the sound pressure level of the measured frequency response curve of the earclip-type earphone is the highest, that is, the output volume is the largest.

[0171] In addition, when the earclip-type earphone is in the wearing state, affected by gravity, β is usually between 0° and 30°. Therefore, when the sound outlet is set such that when β = 0° (i.e., the wearing state where the first symmetry plane of the earhook is parallel to the human horizontal plane), the angle α between the normal line of the sound outlet and the first symmetry plane of the earhook is in the range of 15° - 45°, the listening volume in the wearing scenario where β is between 0° and 30° can be increased. Corresponding to the structure of the earclip-type earphone 1400 in the previous text, that is, the sound outlet 1413 is offset and arranged on the housing 1411, which can compensate for the tilt of the earclip-type earphone 1400 caused by factors such as gravity during wearing, so that the sound outlet 1413 of the tilted earclip-type earphone 1400 can point to the ear canal, thereby ensuring the listening effect and listening volume.

[0172] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

Claims

1. An earclip-type earphone, comprising: a sound generating part, configured to be located in the concha of the wearer and in contact with the inner wall of the concha, the sound generating part comprising: a housing, which forms a receiving cavity; a sound generating component, received in the receiving cavity; a sound outlet hole, located on the housing, the sound outlet hole being configured to conduct the sound generated by the sound generating component; a contact part, configured to contact the back of the wearer's ear; and an ear hook, configured to bypass the antihelix and helix of the wearer and connect the sound generating part and the contact part, the ear hook having a first symmetry plane; There is a feature point on the housing that is in contact with or closest to the contact part, the feature point forms a first projection point in the projection on the first symmetry plane, and the earclip-type earphone further comprises a pressure relief hole, and the arc length of the projection point of the center of the pressure relief hole on the first symmetry plane between the first projection point is in the range of 7.5 mm - 9.5 mm.

2. The earclip-type earphone according to claim 1, wherein, The pressure relief hole extends along a direction perpendicular to the first symmetry plane.

3. The earclip-type earphone according to claim 1, wherein, The outer end surface of the pressure relief hole is symmetric about the first symmetry plane.

4. The earclip-type earphone according to claim 1, wherein The housing comprises a first rigid housing and a second rigid housing, the first rigid housing and the second rigid housing enclose to form the receiving cavity, the first rigid housing is connected to the ear hook, the second rigid housing faces the concha of the wearer, the sound outlet hole is arranged on the first rigid housing, and the sound outlet hole does not extend to the second rigid housing.

5. The earclip-type earphone according to claim 4, wherein, The sound outlet hole has an oblong 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 second symmetry plane is perpendicular to the first symmetry plane.

6. The earclip-type earphone according to claim 1, wherein, The sound outlet hole is located on one side of the first symmetry plane.

7. The earclip-type earphone according to claim 6, wherein The sound outlet hole has a central axis, and the central axis deviates from the first symmetry plane.

8. The earclip-type earphone according to claim 6, wherein, In the wearing state, the included angle formed between the first symmetry plane and the horizontal plane of the wearer's body is between 0° - 30°.

9. The earclip-type earphone according to claim 1, characterized in that, The ear hook forms a third projection in the projection on the first symmetry plane, the third projection includes an inner contour curve, and the point on the inner contour curve that is farthest from the first projection point is used as a second feature point, and the distance between the first projection point and the second feature point is 15 mm - 20 mm.

10. The earclip-type earphone according to claim 1, characterized in that, The projection of the outer end surface of the sound outlet hole on the first symmetry plane can form an arc segment, the arc length of the arc segment is in the range of 5.2 mm - 16.7 mm, and the width of the sound outlet hole is in the range of 1.4 mm - 2.2 mm.

11. The earclip-type earphone according to claim 1, wherein, The sound generating component comprises two sound drivers, a first sound transmission channel is formed between the diaphragms of the two sound drivers, the sound outlet hole is acoustically communicated with the first sound transmission channel, and the first sound transmission channel forms the front cavity of the two sound drivers or a part of the front cavity.

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