Ear cuff type earphones

Abstract

An ear cuff-type earphone according to some embodiments of the present specification includes a housing having an accommodating cavity, a first audio driver and a second audio driver that are both accommodated in the accommodating cavity and that form a first audio transmission path between a first vibration membrane of the first audio driver and a second vibration membrane of the second audio driver, a sound emission hole located in the housing that is acoustically connected to the first audio transmission path and that emits audio generated by the first audio driver and the second audio driver, and includes an audio generation unit configured to be inserted into the cavity of the concha of the wearer when worn, a contact portion configured to contact the back of the wearer's ear when worn, and an ear hook configured to connect the audio generation unit and the contact portion by bypassing the wearer's antihelix and helix when worn.

Description

[Technical Field]

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

[0002] [Incorporated by reference] This application claims priority from Chinese Application No. 202311701969.7, filed on December 11, 2023, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] With the development of audio output technology, audio devices (e.g., earphones) have been widely applied in people's daily lives, and can be used in combination with electronic devices such as mobile phones and computers to provide hearing functions to the wearer. Ear cuff earphones are a novel type of earphone that typically have a small volume and can be clamped around the wearer's helix. When worn, the sound generating unit is inserted into the concha cavity and does not block the ear canal, ensuring safety in outdoor scenarios and providing greater wearing comfort than canal-type earphones. However, due to the limited volume of the concha cavity, there are many restrictions on the volume of the sound generating unit of ear cuff earphones, which leads to certain problems with ear cuff earphones, such as insufficient volume and poor sound quality.

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

[0005] An ear cuff-type earphone according to an embodiment of the present application includes a housing having an accommodating cavity, a first audio driver and a second audio driver that are both accommodated in the accommodating cavity and that form a first audio transmission path between a first vibration membrane of the first audio driver and a second vibration membrane of the second audio driver, a sound emission hole that is located in the housing and acoustically communicates with the first audio transmission path to emit sounds generated by the first audio driver and the second audio driver, and includes: a sound generation unit that is configured to be inserted into the cavity of the concha of a wearer when worn; a contact portion that is configured to contact the back of the wearer's ear when worn; and an ear hook that is configured to connect the sound generation unit and the contact portion by bypassing the wearer's antihelix and helix when worn.

[0006] In some embodiments, the ear hook has a first plane of symmetry, the first diaphragm and the second diaphragm are located on either side of the first plane of symmetry, and the first diaphragm and the second diaphragm are symmetrical with respect to the first plane of symmetry.

[0007] In some embodiments, the first plane of symmetry passes through the sound emission hole.

[0008] In some embodiments, the ear hook has a first plane of symmetry, the first diaphragm and the second diaphragm are symmetrical with respect to a second plane of symmetry, and an inclination angle of less than 45 degrees is formed between the first plane of symmetry and the second plane of symmetry.

[0009] In some embodiments, the sound emission hole is symmetrical with respect to a third plane of symmetry, the third plane of symmetry being perpendicular to the inner wall of the cavity of the concha, and an inclination angle of less than 45 degrees is formed between the first plane of symmetry and the third plane of symmetry.

[0010] In some embodiments, when the wearer wears the ear cuff type earphone, the sound emission hole is located entirely on the side of the first symmetry plane that is close to the wearer's earlobe.

[0011] In some embodiments, the ear hook has a first plane of symmetry, the first diaphragm and the second diaphragm are symmetrical with respect to a fourth plane of symmetry, and the fourth plane of symmetry is perpendicular to the first plane of symmetry.

[0012] In some embodiments, when the wearer wears the ear cuff type earphone, the sound emission hole is located entirely on the side of the first symmetry plane that is close to the wearer's earlobe.

[0013] In some embodiments, the central axis of the sound emitting hole overlaps with the central axis of the first sound transmission passage, the cross-sectional shape of the sound emitting hole taken along a direction perpendicular to its central axis is the same as the cross-sectional shape of the first sound transmission passage taken along a direction perpendicular to its central axis, and the inlet of the sound emitting hole is aligned with the opening of the first sound transmission passage.

[0014] In some embodiments, the first sound transmission passage is a common front cavity of the first diaphragm and the second diaphragm.

[0015] In some embodiments, the first audio driver includes a first magnet and a first magnetic flux conducting cover arranged in sequence apart from the first diaphragm, and a first frame supporting the first diaphragm, the first magnet, and the first magnetic flux conducting cover, and the second audio driver includes a second magnet and a second magnetic flux conducting cover arranged in sequence apart from the second diaphragm, and a second frame supporting the second diaphragm, the second magnet, and the second magnetic flux conducting cover.

[0016] In some embodiments, a second sound transmission passage is formed between the first frame and the second frame, the first frame includes a plurality of first air vents, the second frame includes a plurality of second air vents, the side of the first vibration membrane away from the first sound transmission passage communicates with the second sound transmission passage via the plurality of first air vents, and the side of the second vibration membrane away from the first sound transmission passage communicates with the second sound transmission passage via the plurality of second air vents.

[0017] In some embodiments, the audio generating unit further includes a mounting bracket, and the first audio driver and the second audio driver are both mounted to the mounting bracket.

[0018] In some embodiments, a protrusion is provided on the mounting bracket at a position corresponding to the sound emission hole, and the protrusion abuts against an inner wall of the housing.

[0019] In some embodiments, the protrusion has a through hole formed therein, a first cross-section of the through hole being flush with the end face of the first frame, and a second cross-section of the through hole being flush with the end face of the second frame.

[0020] In some embodiments, the mounting bracket includes the protrusion and an annular portion connected to the protrusion, the annular portion having only one positioning structure, the positioning structure configured to position the first frame and the second frame with the mounting bracket, and the positioning structure being a combination of a positioning protrusion and a positioning groove.

[0021] In some embodiments, a maximum axial distance of the structure formed by the first audio driver, the second audio driver, and the mounting bracket is a first dimension, a maximum radial distance of the structure formed by the first audio driver, the second audio driver, and the mounting bracket is a second dimension, and a ratio of the first dimension to the second dimension is in the range of 0.85 to 1.15.

[0022] In some embodiments, the housing is provided with a decompression hole in acoustic communication with the second sound transmission passage.

[0023] In some embodiments, a plurality of first pads are provided on an end surface of the first frame away from the first vibration membrane, and the minimum distance between at least some of the first pads and the decompression holes is a first minimum distance, and the minimum distance between at least some of the air vent holes and the decompression holes is a second minimum distance, and the first minimum distance is greater than the second minimum distance; a plurality of second pads are provided on an end surface of the second frame away from the second vibration membrane, and the minimum distance between at least some of the second pads and the decompression holes is a third minimum distance, and the maximum distance between at least some of the second air vent holes and the decompression holes is a fourth minimum distance, and the third minimum distance is greater than the fourth minimum distance.

[0024] In some embodiments, the ear hook has a first plane of symmetry, and the sound emission hole, the first sound transmission passage, and the decompression hole are all symmetrical with respect to the first plane of symmetry.

[0025] In some embodiments, when the ear cuff earphone is worn, the decompression hole and the sound emission hole are acoustically isolated by the inner wall of the cavity of the concha.

[0026] In some embodiments, the decompression hole includes a first end, a second end, and a connecting segment connecting the first end and the second end, the first end, the second end, and the connecting segment being disposed along the length of the decompression hole, and the minimum width of the first end and the second end being greater than the maximum width of the connecting segment.

[0027] In some embodiments, a first step structure and a second step structure are installed inside the housing, the first step structure abutting the first magnetic flux conducting cover or the first frame of the first audio driver, and the second step structure abutting the second magnetic flux conducting cover or the second frame of the second audio driver.

[0028] In some embodiments, the first step structure includes a first stopper and a second stopper, the first stopper abutting an end face of the first magnetic flux conducting cover remote from the first vibration membrane, and the second stopper abutting an outer wall of the first magnetic flux conducting cover; the second step structure includes a third stopper and a fourth stopper, the third stopper abutting an end face of the second magnetic flux conducting cover remote from the second vibration membrane, and the fourth stopper abutting an outer wall of the second magnetic flux conducting cover.

[0029] In some embodiments, a sealant is filled between the first frame, the second frame and the mounting bracket.

[0030] In some embodiments, the resonant frequency of the first vibrating membrane and the resonant frequency of the second vibrating membrane are both lower than 300 Hz, and the difference between the resonant frequency of the first vibrating membrane and the resonant frequency of the second vibrating membrane is less than 50 Hz.

[0031] In some embodiments, the first audio driver further includes a first coil arranged in the first frame, the first coil arranged to surround a side wall of the first magnet, and one end of the first coil connected to the first diaphragm; the second audio driver further includes a second coil arranged in the second frame, the second coil arranged to surround a side wall of the second magnet, and one end of the second coil connected to the second diaphragm; the earhook has a first plane of symmetry, the first frame and the second frame are identical and symmetrical with respect to the first plane of symmetry, the first magnetic flux conducting cover and the second magnetic flux conducting cover are identical and symmetrical with respect to the first plane of symmetry, and the first coil and the second coil are identical and symmetrical with respect to the first plane of symmetry.

[0032] In some embodiments, the housing includes a first rigid housing, a second rigid housing configured to be placed toward the wearer's concha cavity when worn, and a flexible body configured to contact the wearer's concha cavity when worn, wherein the first rigid housing and the second rigid housing surround the accommodating cavity, and the flexible body covers an outer wall of the second rigid housing.

[0033] In some embodiments, the plane on which the outermost circular line of the end surface of the flexible body is located is a first reference plane, and the midpoint of the line connecting the center of the first vibrating membrane and the center of the second vibrating membrane is located outside the first reference plane, or the plane on which the outermost circular line of the end surface of the second rigid housing is located is a second reference plane, and the midpoint of the line connecting the center of the first vibrating membrane and the center of the second vibrating membrane is located outside the second reference plane.

[0034] In some embodiments, the ear hook has a first plane of symmetry, a projection of the midpoint of a line connecting the center of the first vibrating membrane and the center of the second vibrating membrane onto the first plane of symmetry is a first projection point, an intersection line between the first reference plane and the first plane of symmetry is a first intersection line, and a distance between the first projection point and the first intersection line is in the range of 0.4 mm to 4 mm.

[0035] In some embodiments, the sound emission holes are located in the second rigid housing and the flexible body.

[0036] In some embodiments, a projection of the inner wall of the accommodating cavity onto the first plane of symmetry is a first projection, a projection of the first reference plane onto the first plane of symmetry is a second projection, the first projection and the second projection have a first intersection point and a second intersection point, a distance between the first intersection point and the second intersection point is an intersection distance, the first projection includes a first arc-shaped segment and a second arc-shaped segment, and a ratio of the first arc-shaped segment and the second arc-shaped segment to the intersection distance is both 1.4 to 1.7.

[0037] In some embodiments, the ear cuff earphone further includes a microphone assembly, the microphone assembly is installed in the ear hook, the microphone assembly forms a third sound transmission passage, a sound introduction hole is installed on the side of the ear hook close to the sound generation unit, the sound introduction hole is acoustically connected to the third sound transmission passage, the ear hook has a first symmetry plane, and the sound introduction hole is symmetrical with respect to the first symmetry plane.

[0038] The present application will be further illustrated by exemplary embodiments, which are not limiting and will be described in detail with reference to the drawings, in which like reference numerals indicate like structures. [Brief explanation of the drawings]

[0039] [Figure 1] 1 is a schematic diagram illustrating an example of a wearing of an ear cuff-type earphone according to some embodiments of the present disclosure. [Figure 2] 1 is a schematic diagram illustrating the configuration of an ear cuff-type earphone according to some embodiments of the present specification. [Figure 3] 1 is a schematic cross-sectional view of a sound generating unit in a direction perpendicular to the length direction of the ear hook according to some embodiments of the present disclosure. FIG. [Figure 4] 1 is a schematic cross-sectional view of an ear cuff-type earphone in a first plane of symmetry according to some embodiments of the present specification. [Figure 5] 1 is a schematic cross-sectional view of an ear cuff-type earphone in a horizontal plane according to some embodiments of the present disclosure. [Figure 6] 10A-10C are diagrams illustrating sound pressure curves received by a test microphone when a sound generating unit or sound generating assembly according to some embodiments of the present disclosure is positioned at different positions of the test microphone. [Figure 7A] FIG. 1 is a schematic diagram of the installation location of sound emission holes according to some embodiments of the present disclosure. [Figure 7B] 1 is a schematic diagram illustrating a wearing state of an ear cuff-type earphone according to some embodiments of the present specification. [Figure 8]1A-1C are schematic diagrams illustrating different mounting angles β according to some embodiments herein. [Figure 9] 1 is a schematic cross-sectional view of an ear cuff-type earphone in a first plane of symmetry according to some other embodiments of the present specification. [Figure 10] 10 is a schematic cross-sectional view of a sound generating unit in a first plane of symmetry according to some other embodiments of the present specification. FIG. [Figure 11] 10A-10C are schematic cross-sectional views of sound generating units in a first plane of symmetry according to further some embodiments of the present disclosure. [Figure 12] 1 is a schematic cross-sectional view of two audio drivers in an axial and radial plane of a first magnetic flux conducting cover according to some embodiments of the present disclosure; [Figure 13] 1 is a top view of a first audio driver, a second audio driver, and a mounting bracket when connected in accordance with some embodiments herein. FIG. [Figure 14] FIG. 1 is a front view of a first audio driver, a second audio driver, and a mounting bracket when connected in accordance with some embodiments herein. [Figure 15] FIG. 10 is a schematic diagram illustrating a first audio driver, a second audio driver, and a mounting bracket when connected together according to some other embodiments of the present disclosure. [Figure 16] 1 is an assembled schematic diagram of a first audio driver, a second audio driver, and a mounting bracket according to some embodiments herein. [Figure 17] 1 is a schematic cross-sectional view of another sound generating unit in an axial and radial plane according to some embodiments herein. FIG. [Figure 18] 1 is a schematic diagram illustrating the configuration of an ear cuff-type earphone according to some embodiments of the present specification. [Figure 19] 1 is a schematic cross-sectional view of an audio generating unit in a plane parallel to a first plane of symmetry according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0040] In order to more clearly describe the technical means of the embodiments of the present application, the drawings necessary for describing the embodiments will be briefly described below. Obviously, the drawings described below are only examples or parts of the embodiments of the present application, and those skilled in the art can apply the present application to other similar scenarios based on these drawings without any creative effort. Unless otherwise clear from the context or described otherwise, the same symbols in the drawings represent the same structures or operations.

[0041] It should be understood that the terms "system," "device," "unit," and / or "module" used herein are ways of distinguishing between various levels of assemblies, elements, components, parts, or structures. However, other terms may be used in place of the above terms if they achieve the same purpose.

[0042] As used herein and in the claims, unless the context clearly dictates otherwise, terms such as "a," "one," "one kind," and / or "the" do not specifically refer to the singular but may include the plural. In general, the terms "comprise" and "containing" merely indicate the inclusion of explicitly identified steps and elements, and these steps and elements are not an exclusive listing, and a method or apparatus may include other steps or elements.

[0043] It should be noted that in the description herein, the terms "first," "second," "third," "fourth," etc. are used for descriptive purposes only and should not be understood to denote or suggest relative importance or to implicitly denote the quantity of the depicted technical features. Therefore, a feature qualified by "first," "second," "third," or "fourth" can explicitly or implicitly denote the inclusion of at least one of the feature. In the description herein, unless otherwise clearly and specifically limited, "plurality" means at least two, e.g., two, three, etc.

[0044] In this specification, unless otherwise clearly specified or limited, the terms "connected," "fixed," etc. should be understood in a broad sense. For example, unless otherwise clearly limited, the term "connected" may mean a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in this specification according to specific circumstances.

[0045] FIG. 1 is an exemplary schematic diagram of an ear cuff earphone according to some embodiments of the present disclosure. FIG. 2 is a schematic structural diagram of an ear cuff earphone according to some embodiments of the present disclosure. In some embodiments, the ear cuff earphone 200 may include, but is not limited to, an air conduction earphone, a bone conduction earphone, or an earphone that combines air conduction and bone conduction. As shown in FIGS. 1 and 2 , the ear cuff earphone 200 may include a sound generating unit 21 (also called a sound generating assembly), a contact portion 26, and an ear hook 27 connecting the sound generating unit 21 and the contact portion 26. The ear cuff earphone 200 is held in the wearer's ear 100 by engagement between the ear hook 27, the sound generating unit 21, and the contact portion 26.

[0046] In some embodiments, when the ear cuff earphone 200 is in a worn state, the sound generating unit 21 is located within the wearer's concha 102 and fits to the inner wall of the concha 102. The abutting portion 26 abuts against the back of the wearer's ear, for example, against the back surface of the concha 102. Both ends of the ear hook 27 are connected to the abutting portion 26 and the sound generating unit 21, respectively, and intermediate regions between both ends of the ear hook 27 form extension segments with a certain arc so that the ear hook 27 can bypass the wearer's antihelix 104 and helix 106 when worn. The ear hook 27 may be elastic, which means that when the sound generating unit 21 moves away from the abutting portion 26, the ear hook 27 can provide an elastic force that moves the sound generating unit 21 closer to the abutting portion 26. When worn, the elastic force of the ear hook 27 can be converted into a clamping force that clamps the sound generating unit 21 and the contact unit 26 on both the front and rear sides of the cavity of the concha 102, ensuring stability when worn.

[0047] In some embodiments, in order to fit the shape of the cavity of the concha 102, the outer shape of the sound-generating unit 21 needs to be close to the shape of the cavity of the concha 102, for example, spherical, near-spherical, or fusiform, so that the sound-generating unit 21 can fully contact the inner wall of the cavity of the concha 102 and engage with the abutment portion 26 to be fastened to both the front and rear sides of the cavity of the concha 102. Due to the limited spatial dimensions of the cavity of the concha 102, the volume of the housing for the sound-generating unit 21 is small, and the size of the audio driver housed inside the housing is limited, resulting in low sound generation efficiency of the sound-generating unit 21.

[0048] Based on this, some embodiments of the present specification provide ear cuff-type earphones, in which two audio drivers are installed inside the housing of the sound generating unit of the ear cuff-type earphone, and a first audio transmission path is formed between the vibration membranes of the two audio drivers. By installing sound emission holes in the housing of the sound generating unit and acoustically communicating with the first audio transmission path, sounds generated by the two audio drivers can be simultaneously emitted, improving the user's listening volume. Furthermore, by optimizing the structure and arrangement of the two audio drivers, the overall structure formed by the two audio drivers can be well adapted to the internal space of the housing of the sound generating unit, making full use of the limited space in the housing of the sound generating unit and further improving the audio generation efficiency of the sound generating unit. When the sound generating unit is inserted into the cavity of the concha, the ear cuff-type earphone according to the present specification can fully and effectively utilize the internal space of the housing of the sound generating unit, improving the overall audio generation efficiency of the sound generating unit, thereby significantly improving the wearing comfort and sound quality of the ear cuff-type earphone.

[0049] FIG. 3 is a schematic cross-sectional view of the sound generating unit in a direction perpendicular to the length direction of the ear hook according to some embodiments of the present specification. FIG. 4 is a schematic cross-sectional view of an ear cuff-type earphone in a first plane of symmetry according to some embodiments of the present specification. FIG. 5 is a schematic cross-sectional view of an ear cuff-type earphone in a horizontal plane according to some embodiments of the present specification. As shown in FIGS. 1 to 5 , the ear hook 27 has a first plane of symmetry A1, which is a plane that divides the ear hook 27 into two symmetrical parts along the length direction of the ear hook 27. Since the first plane of symmetry A1 is parallel or approximately parallel to the length direction of the ear hook 27, the first plane of symmetry A1 is also referred to as the ear hook length direction symmetry plane. The length direction of the ear hook 27 is the direction in which one end of the ear hook 27 connected to the abutment portion 26 extends toward one end of the ear hook 27 connected to the sound generating unit 21. The length direction of the ear hook 27 may be indicated by arrow Z in FIG. 5.

[0050] In some embodiments, the ear hook 27 may include, but is not limited to, a hook structure, an elastic band, a metal wire, or a metal sheet, etc., to better secure the ear cuff earphone 200 to the wearer's body and prevent it from falling off when worn.

[0051] In some embodiments, as shown in FIGS. 1 to 4 , the abutting portion 26 abuts against the back of the wearer's ear and engages with the sound generating unit 21 to form a clamping configuration to clamp the ear portion 100. In some embodiments, the abutting portion 26 may have a second housing 261, and the abutting portion 26 is connected to the ear hook 27 via the second housing 261. The second housing 261 may form an accommodation space. In some embodiments, the accommodation space formed by the second housing 261 can be used as a battery storage space that accommodates a battery and / or other assemblies (e.g., a circuit board). In some embodiments, the battery can supply electrical energy to the ear cuff earphone 200; for example, the battery is electrically connected to the sound generating unit 21 and can supply electrical energy to the sound generating unit 21. In some embodiments, the circuit board may be electrically connected to the sound generating unit 21 (e.g., electrically connected via a lead wire or a flexible circuit board) to control sound generation by the sound generating unit 21. In some embodiments, the circuit board and the battery may both be installed in the accommodation space formed by the second housing 261. In some embodiments, the circuit board and the battery may be installed in the accommodation space formed by the second housing 261 and in the housing 210 of the sound generating unit 21, respectively, and the circuit board and the battery may be electrically connected to each other via corresponding conductors and further electrically connected to the sound generating unit via conductors. In some embodiments, the circuit board and the battery may both be installed in the housing 210 of the sound generating unit 21.

[0052] The sound generating unit 21 is a sound generating device of the ear cuff type earphone 200. As shown in Fig. 3, the sound generating unit 21 may include a housing 210, a first audio driver 220, a second audio driver 230, and a sound output hole 240. The housing 210 has an accommodating cavity 211. The first audio driver 220 and the second audio driver 230 are both accommodated in the accommodating cavity 211. The sound output hole 240 is located in the housing 210. The sound output hole 240 is used to emit sounds generated by the first audio driver 220 and the second audio driver 230.

[0053] In some embodiments, the housing 210 may be integrally molded. In some embodiments, the housing 210 may be composed of multiple parts. For example, the housing 210 may include a first hard housing 214 and a second hard housing 215, which enclose the housing 210 having the receiving cavity 211. One of the two hard housings (e.g., the second hard housing 215) faces the wearer's concha cavity and contacts the inner wall of the concha cavity. The other hard housing is connected to the ear hook 27. In some embodiments, the housing 210 may further include a flexible body 216. The outer surface of the hard housing (e.g., the second hard housing 215) that contacts the inner wall of the wearer's concha cavity may be covered with the flexible body 216.

[0054] An audio driver is a device that can receive an electrical signal, convert it into an audio signal, and output it. Examples of such devices include a speaker and a transducer. The audio driver may include a diaphragm and a magnetic circuit assembly. The magnetic circuit assembly is used to generate a magnetic field. In some embodiments, the magnetic circuit assembly may include a magnet, a magnetic flux conductive cover, a magnetic flux conductive plate, and a coil. The diaphragm vibrates due to the action of the magnetic field and the coil, causing the air around the diaphragm to vibrate. The cavity inside the housing 210 (i.e., the accommodating cavity 211) may be divided by the diaphragm into at least a front cavity and a rear cavity. The front cavity is an acoustic cavity formed on the side of the diaphragm away from the magnetic circuit assembly. The rear cavity is an acoustic cavity formed on the side of the diaphragm closer to the magnetic circuit assembly. Sound generated on the side of the diaphragm away from the magnetic circuit assembly is emitted to the outside of the housing 210 through a sound emission hole 240 coupled to the front cavity. Sound generated on the side of the diaphragm facing the magnetic circuit assembly is released to the outside of the housing 210 through a decompression hole (for example, decompression hole 217 shown in FIG. 18) acoustically coupled to the rear cavity.

[0055] In this embodiment, two audio drivers are installed inside the housing 210 of the audio generating unit 21, allowing sounds generated by the two audio drivers to be emitted simultaneously, improving the listening volume for the wearer. FIG. 6 exemplarily illustrates sound pressure curves received by a test microphone when the audio generating unit (e.g., the audio generating unit 21 in FIG. 1) and the audio generating assembly are located at different positions on the test microphone. The test microphone can receive an external audio signal. As shown in FIG. 6, the diagram illustrates a sound pressure curve 410 received by the test microphone when the audio generating unit is located to the left of the test microphone, a sound pressure curve 420 received by the test microphone when the audio generating unit is located to the right of the test microphone, a sound pressure curve 430 received by the test microphone when the audio generating assembly is located to the upper left of the test microphone, a sound pressure curve 440 received by the test microphone when the audio generating assembly is located to the lower left of the test microphone, a sound pressure curve 450 received by the test microphone when the audio generating assembly is located to the upper right of the test microphone, and a sound pressure curve 460 received by the test microphone when the audio generating assembly is located to the lower right of the test microphone. Here, in this embodiment, "up" and "down" respectively correspond to the opposing sides of the test microphone, and "left" and "right" also respectively correspond to the opposing sides of the test microphone, and the direction from top to bottom is different from the direction from left to right. Sound pressure curves 410 and 420 correspond to a sound generating unit having a double diaphragm structure (e.g., sound generating unit 21 in FIG. 1 ) in an embodiment of this specification, where the two diaphragms are connected in parallel at the same voltage. Sound pressure curves 430 to 460 correspond to a sound generating assembly having a single diaphragm structure. If the sound pressure at the sound output port of a sound generating assembly having a single diaphragm is P, the sound pressure at the sound output port of a sound generating unit having double diaphragms connected in parallel at the same voltage is 2P1, and the formula for the sound pressure level is as follows:

[0056]

number

[0057] Here, Pref is the reference sound pressure, and according to the formula, the difference between the sound pressure level of the sound generating assembly having a single membrane structure and the sound pressure level of the sound generating assembly having a double membrane structure is as follows:

[0058]

number

[0059] That is, by providing a double vibrating membrane structure, the sound pressure level of the sound generating unit can be effectively improved, thereby improving the listening volume for the wearer.

[0060] 3, the first audio driver 220 may include a first vibrating membrane 221 and a first magnetic circuit assembly (e.g., a first magnetic flux conductive plate 225, a first magnet 222, and a first magnetic flux conductive cover 223 spaced apart from the first vibrating membrane 221) disposed on one side of the first vibrating membrane 221 in the vibration direction. The second audio driver 230 may include a second vibrating membrane 231 and a second magnetic circuit assembly (e.g., a second magnetic flux conductive plate 235, a second magnet 232, and a second magnetic flux conductive cover 233 spaced apart from the second vibrating membrane 231) disposed on one side of the second vibrating membrane 231 in the vibration direction. A first audio transmission path 212 is formed between the first vibrating membrane 221 and the second vibrating membrane 231. The first audio transmission path 212 and the first magnetic circuit assembly are located on both sides of the first vibrating membrane 221 in the vibration direction, and the first audio transmission path 212 corresponds to a front cavity of the first audio driver 220. The second sound transmission passage 213 and the second magnetic circuit assembly are respectively located on both sides of the vibration direction of the second vibrating membrane 231, and the first sound transmission passage 212 also corresponds to the front cavity of the second sound driver 230. The first sound transmission passage 212 simultaneously functions as the front cavity of the first sound driver 220 and the second sound driver 230, and therefore the first sound transmission passage 212 is a shared front cavity of the first sound driver 220 and the second sound driver 230. The vibration direction of the vibrating membrane may be perpendicular to the plane in which the vibrating membrane is located, and may be indicated by arrow X in FIG. 3.

[0061] When the first audio driver 220 and the second audio driver 230 share a front cavity, sound waves in the front cavities of the two audio drivers can be emitted to the outside of the housing 210 through the same sound emission hole 240, thereby simplifying the overall structure of the sound generating unit 21 and reducing the manufacturing cost of the sound generating unit 21. In other words, when the first audio driver 220 and the second audio driver 230 share a front cavity, the number of openings in the housing 210 can be reduced. In addition, when the double vibrating membrane structure works together, it has a greater effect on the change in sound pressure in the first sound transmission path 212 than when the cross-sectional area of ​​the sound emission hole 240 does not change, and the two audio drivers work together to increase the volume of the sound emitted from the sound emission hole 240, thereby improving the acoustic effect.

[0062] In some alternative embodiments, the front cavity of the first audio driver 220 and the front cavity of the second audio driver 230 may be independent of each other and acoustically communicate with different sound outlets.

[0063] In some alternative embodiments, the rear cavity of the first audio driver 220 and the rear cavity of the second audio driver 230 may be independent of each other and acoustically communicate with different decompression holes (for example, the number of decompression holes 217 shown in FIG. 18 may be two, and the two decompression holes 217 communicate with the rear cavity of the first audio driver 220 and the rear cavity of the second audio driver 230, respectively). In some alternative embodiments, the rear cavity of the first audio driver 220 and the rear cavity of the second audio driver 230 may communicate with each other and radiate sound to the outside through the same decompression hole (for example, decompression hole 217 in FIG. 18). That is, the first audio driver 220 and the second audio driver 230 share a rear cavity.

[0064] In some embodiments, as shown in FIGS. 1 to 5 , the ear cuff earphone 200 may further include a microphone assembly (not shown), which is configured to convert a received audio signal into an electrical signal. In some embodiments, the microphone assembly may include a capacitor microphone, a piezoelectric microphone, a piezoresistive microphone, etc., based on the energy conversion principle. In some embodiments, the microphone assembly may include an air conduction microphone or a microphone combination combining air conduction and bone conduction, based on the audio collection method. In some embodiments, the microphone assembly may be installed within the ear hook 27, and the microphone assembly may form a third audio transmission path (not shown). A sound introduction hole (e.g., sound introduction hole 280 in FIG. 9 ) is installed on the side of the ear hook 27 close to the audio generating unit 21, and the sound introduction hole is acoustically connected to the third audio transmission path. The sound introduction hole may be symmetrical with respect to the first symmetry plane A1. In this embodiment, an audio signal (e.g., a signal generated when the wearer speaks) is transmitted to the third audio transmission path through the audio inlet, received by the microphone assembly through the third audio transmission path, and processed by the microphone assembly to obtain a corresponding electrical signal. By arranging the audio inlet symmetrically with respect to the first symmetry plane A1, whether the ear cuff type earphone 200 is worn on the wearer's left ear or right ear does not significantly affect the effectiveness of the microphone assembly in receiving the audio signal.

[0065] In some embodiments, first vibrating membrane 221 and second vibrating membrane 231 may be the same or similar. As a mere example, as can be seen from FIGS. 3 to 6 , sound pressure curves 410 and 420 corresponding to a sound generating unit having a double vibrating membrane structure each produce a peak value in the frequency range of 200 Hz to 300 Hz. This peak value is the frequency at which the corresponding sound generating unit produces a resonant peak, and corresponds to the resonant frequencies of first vibrating membrane 221 and second vibrating membrane 231 both being lower than 300 Hz and the difference between the resonant frequencies of first vibrating membrane 221 and second vibrating membrane 231 being less than 50 Hz. The resonant frequency is the first resonant peak that appears in order from low to high frequency when an electroacoustic sweep test is performed on the sound generating unit (e.g., a structure composed of an audio driver, a housing, an internal cavity of the housing, etc.). The position at which this resonant peak appears corresponds to the position at which the impedance curve of the sound generating unit abruptly increases. The resonant frequency of the diaphragm is the resonant frequency that appears after the diaphragm is assembled into the audio driver. In the embodiment of this specification, the resonant peak frequencies of the two diaphragms of the audio generating unit 21 are both lower than 300 Hz. For example, the resonant frequencies of the two diaphragms are both between 200 Hz and 300 Hz, which can better represent the low-frequency portion of the audio signal and thereby provide a better musical effect. In addition, if the first diaphragm 221 and the second diaphragm 231 are the same, there is no need to manufacture the first diaphragm 221 and the second diaphragm 231 separately, which reduces the number of materials required for manufacturing and reduces costs and production difficulty.

[0066] 3 to 5, first vibrating membrane 221 and second vibrating membrane 231 are located on either side of first plane of symmetry A1, and first vibrating membrane 221 and second vibrating membrane 231 are symmetrical with respect to first plane of symmetry A1. Here, "on either side of first plane of symmetry A1" refers to both sides in a direction perpendicular to first plane of symmetry A1. "Symmetrical with respect to first plane of symmetry A1" means that the two vibrating membranes are mirror-symmetrical with respect to first plane of symmetry A1.

[0067] In some cases, if the first vibrating membrane 221 and the second vibrating membrane 231 are identical and mirror-symmetric with respect to the first plane of symmetry A1, the cost and difficulty of production can be further reduced.

[0068] Furthermore, if the first vibrating membrane 221 and the second vibrating membrane 231 are mirror-symmetric with respect to the first plane of symmetry A1, the first magnetic circuit assembly (e.g., the first magnet 222, the first magnetic flux conductive cover 223, etc.) and the second magnetic circuit assembly (e.g., the second magnet 232, the second magnetic flux conductive cover 233, etc.) can be installed so as to be mirror-symmetric with respect to the first plane of symmetry A1, and further, the first audio driver 220 and the second audio driver 230 can be installed so as to be mirror-symmetric with respect to the first plane of symmetry A1, thereby reducing the types of materials used to manufacture the audio generating unit 21 and further reducing costs and production difficulty. Furthermore, when the first audio driver 220 and the second audio driver 230 are mirror-symmetric with respect to the first symmetry plane A1, the overall structure formed by the first audio driver 220 and the second audio driver 230 can be made closer to a sphere, a sphere-like body, or a spindle, and can be more adapted to the shape of the accommodating cavity 211, thereby achieving the purpose of fully utilizing the space of the accommodating cavity 211.

[0069] In some embodiments, first vibrating membrane 221 and second vibrating membrane 231 may be approximately symmetrical (i.e., not perfectly symmetrical) with respect to first plane of symmetry A1. By way of example only, if the angle between the plane on which first vibrating membrane 221 is located and first plane of symmetry A1 is a first angle, the angle between the plane on which second vibrating membrane 231 is located and first plane of symmetry A1 is a second angle, and the difference between the first angle and the second angle is between 0 degrees and 5 degrees, then first vibrating membrane 221 and second vibrating membrane 231 are considered to be approximately symmetrical with respect to first plane of symmetry A1.

[0070] In some alternative embodiments, the first vibrating membrane 221 and the second vibrating membrane 231 may be symmetrical with respect to a plane other than the first plane of symmetry A1. By way of example only, the first vibrating membrane 221 and the second vibrating membrane 231 may be located on either side of the first parallel plane of symmetry and symmetrical with respect to the first parallel plane of symmetry. The first parallel plane of symmetry may be parallel to the first plane of symmetry A1. However, the distance between the first vibrating membrane 221 and the first plane of symmetry A1 is different from the distance between the second vibrating membrane 231 and the first plane of symmetry A1.

[0071] In some embodiments, by making the angle between the central axis of the sound output hole 240 and the central axis of the first sound transmission passage 212 smaller than a certain value, the sound waves in the first sound transmission passage 212 can be more smoothly emitted from the sound output hole 240, thereby improving the quality of sound generation.

[0072] In some embodiments, the angle between the central axis of sound emitting hole 240 and the central axis of first sound transmission passage 212 may be less than 30 degrees. In some embodiments, the angle between the central axis of sound emitting hole 240 and the central axis of first sound transmission passage 212 may be less than 15 degrees. In some embodiments, the angle between the central axis of sound emitting hole 240 and the central axis of first sound transmission passage 212 may be less than 5 degrees. In some embodiments, the central axis of sound emitting hole 240 may be parallel to the central axis of first sound transmission passage 212. By way of example only, the central axis of sound emitting hole 240 is a first central axis. The central axis of first sound transmission passage 212 is a second central axis. The distance between the first central axis and the second central axis is a first distance. The distance between the surface on which first vibrating membrane 221 is located and the surface on which second vibrating membrane 231 is located is a second distance. The ratio of the first distance to the second distance is less than a predetermined distance ratio. Exemplary predetermined distance ratios may include 20%, 10%, 5%, and the like.

[0073] In some embodiments, the central axis of the sound emitting hole 240 overlaps with the central axis of the first sound transmission passage 212, the shape of the cross section of the sound emitting hole 240 taken along a direction perpendicular to its own central axis is the same as the shape of the cross section of the first sound transmission passage 212 taken along a direction perpendicular to its own central axis, and the entrance of the sound emitting hole 240 is aligned with the opening of the first sound transmission passage 212. Aligned means that the entrance edge of the sound emitting hole 240 is flush with the opening edge of the first sound transmission passage 212.

[0074] In some embodiments, as shown in FIGS. 1 to 5, sound emission hole 240 may be located on the side of housing 210 away from ear hook 27 so that sound emission hole 240 faces the wearer's ear canal when worn.

[0075] In some embodiments, the first plane of symmetry A1 may pass through the sound emitting hole 240. In some embodiments, the sound emitting hole 240 may be located in the middle of the housing 210 or may be offset. For example, the sound emitting hole 240 has an elongated shape. Along the length of the sound emitting hole 240, the first plane of symmetry A1 may divide the sound emitting hole 240 into two symmetrical parts. Also, for example, when the sound emitting hole 240 is located offset from the housing 210, the outer end surface of the sound emitting hole 240 is asymmetric with respect to the first plane of symmetry A1.

[0076] In some embodiments, the inner end surface of the sound emission hole 240 is flush with the inner wall surface of the housing 210, and the outer end surface of the sound emission hole 240 is flush with the outer wall surface of the housing 210. In some embodiments, the outer end surface of the sound emission hole 240 can be projected onto the first plane of symmetry A1 to form an arc-shaped segment. The projection of the housing 210 onto the first plane of symmetry A1 has an arc-shaped outer contour. At least a portion of the arc-shaped outer contour overlaps with the arc-shaped segment. For ease of explanation, hereinafter, the arc-shaped segment formed by projecting the outer end surface of the sound emission hole 240 onto the first plane of symmetry A1 will be simply referred to as the arc-shaped segment of the sound emission hole 240, and the arc-shaped outer contour of the projection of the housing 210 onto the first plane of symmetry A1 will be simply referred to as the arc-shaped outer contour of the housing 210. In some embodiments, the sound generating unit 21 (or the housing 210) may have a substantially spherical shape as a whole, and the projection of the housing 210 onto the first plane of symmetry A1 may have an arcuate outer contour. Because the sound emitting holes 240 are formed in the housing 210 of the sound generating unit 21, the outer end surfaces of the sound emitting holes 240 have an arcuate structure. Based on this, it can be seen that the projection of the outer end surfaces of the sound emitting holes 240 onto the first plane of symmetry A1 can form an arcuate segment. Furthermore, when the outer end surfaces of the sound emitting holes 240 are symmetrical with respect to the first plane of symmetry A1, the arcuate segment of the sound emitting holes 240 overlaps with at least a portion of the arcuate outer contour of the housing 210.

[0077] By designing the sound output hole 240 to be elongated and forming an arc-shaped segment with a constant arc length by projecting the long side of the elongated hole onto the first plane of symmetry A1, the ear cuff earphone 200 can accommodate people with different ear sizes and ear shapes. Specifically, as shown in Figures 1, 3, and 5, when the sound generating unit 21 is inserted into the cavum concha 102 of different depths or sizes, different areas of the sound generating unit 21 may be covered to different degrees by the inner wall of the cavum concha 102, or the area of ​​the housing 210 of the sound generating unit 21 that directly faces the ear canal may change. The elongated sound output hole 240, with the first plane of symmetry A1 as its plane of symmetry, ensures that the sound output hole 240 always has a constant area that directly faces the ear canal in most scenarios, thereby improving the sound quality of the earphone. Furthermore, by arranging the housing 210 so that at least a portion of the arcuate outer contour overlaps with the arcuate segment of the sound output hole 240, it is possible to ensure that the outer end surface of the sound output hole 240 is symmetrical with respect to the first plane of symmetry A1, thereby ensuring that a portion of the sound output hole 240 is covered by the wall of the concha cavity when worn, making the sound field of the sound emitted from the sound output hole 240 a reflected field, enhancing the reflection and thereby improving the volume heard by the wearer.

[0078] FIG. 7A is a schematic diagram of the installation position of a sound emission hole according to some embodiments of the present specification. FIG. 7B is a schematic diagram of a wearing state of an ear cuff type earphone according to some embodiments of the present specification. FIG. 8 is a schematic diagram of a wearing state at a different angle β according to some embodiments of the present specification. In some embodiments, as shown in FIGS. 3 to 8, the output volume of the ear cuff type earphone 200 in the wearer's ear canal may be adjusted by changing the position of the sound emission hole 240 in the sound generating unit 21. Typically, the greater the output volume of the ear cuff type earphone 200 toward the ear canal, the louder the sound the wearer can experience with the same output power. In this way, the energy consumption of the ear cuff type earphone 200 can be reduced and sound leakage can be reduced.

[0079] 2 to 5, 7A, 7B, and 8, it is necessary to adjust the positions of the first vibrating membrane 221 and the second vibrating membrane 231 in order to change the position of the sound output hole 240 in the sound generating unit 21. For example, the first vibrating membrane 221 and the second vibrating membrane 231 are adjusted to be symmetrical with respect to the second plane of symmetry A2, and an inclination angle of less than 45 degrees is formed between the first plane of symmetry A1 and the second plane of symmetry A2. In this case, when the central axis of the sound output hole 240 and the central axis of the first sound transmitting passage 212 overlap, the central axis of the sound output hole 240 and the first plane of symmetry A1 also form an inclination angle of less than 45 degrees. In other words, the sound output hole 240 is offset with respect to the first plane of symmetry A1. With this design, even if the ear hook 27 tilts against the pinna due to gravity during wearing (i.e., as shown in FIG. 7B, the central region of the ear hook 27 slides down toward the bottom end of the pinna relative to the sound generating unit 21), the sound emission hole 240 can still be directed toward the ear canal.

[0080] In other embodiments, as shown in FIGS. 2 to 5, 7A, 7B, and 8, the sound emitting holes 240 are symmetrical with respect to a third plane of symmetry (not shown). The third plane of symmetry is perpendicular to the contact area between the sound emitting holes 240 and the inner wall of the cavity of the concha 102, and an inclination angle of less than 45 degrees is formed between the first plane of symmetry A1 and the third plane of symmetry. The contact area is the contact portion between the outer end surface of the sound emitting holes 240 and the inner wall of the cavity of the concha 102. This embodiment illustrates the offset of the sound emitting holes 240 at a different angle, and explains that even if the earhook 27 is tilted relative to the pinna due to gravity during wearing (i.e., as shown in FIG. 7B, the central region of the earhook 27 slides down toward the bottom end of the pinna relative to the sound generating unit 21), the sound emitting holes 240 can still be directed toward the ear canal.

[0081] In some embodiments, as shown in FIGS. 1 and 3 to 8, the sound output hole 240 may be elongated, and the longitudinal direction of the sound output hole 240 is parallel to the first plane of symmetry A1. The angle between the normal line of the sound output hole 240 extending from the sound generating unit 21 to the outside (i.e., the central axis of the sound output hole 240) and the plane of symmetry in the ear hook length direction (i.e., the first plane of symmetry A1) is defined as α, and the angle between the first plane of symmetry A1 and the horizontal plane of the human body is defined as β. The horizontal plane of the human body is a plane that intersects an upright human body and is parallel to the ground. FIG. 8 shows the angles between the first plane of symmetry A1 and the horizontal plane of the human body for three earphone placement states, where β1 = -20°, β2 = 0°, and β3 = 45°. When α = 0°, the first plane of symmetry A1 passes through the central axis of the sound output hole 240. When β = 0°, the first plane of symmetry A1 is parallel to the horizontal plane of the human body. In this case, when α is within the range of 15° to 45°, the sound pressure level SPL of the frequency response curve of the ear cuff earphone 200 is the highest, that is, the output volume is the largest. When the ear cuff earphone 200 is worn, β is usually between 0° and 30° due to the influence of gravity, so when β=0° (i.e., the first symmetry plane A1 is parallel to the horizontal plane of the human body), the sound emitting hole 240 is installed so that the angle α between the normal to the sound emitting hole 240 and the first symmetry plane A1 is between 15° and 45°, and the listening volume can be increased in a wearing scenario where β is between 0° and 30°.

[0082] In some embodiments, when the wearer is wearing the ear cuff earphone 200, the sound emission hole 240 may be located entirely on the side of the first symmetry plane A1 that is closer to the wearer's earlobe, thereby further ensuring that the sound emission hole 240 of the ear cuff earphone 200 faces the ear canal even if the ear cuff earphone 200 is tilted due to factors such as gravity when worn, thereby ensuring the listening effect and listening volume.

[0083] 3 to 8 and the examples thereof are merely for describing an exemplary structure of the sound generating unit 21 and are not intended to limit the specific structure of the sound generating unit 21. After understanding the basic principles of the sound generating unit 21, the structure of the sound generating unit 21 can be adjusted according to actual conditions. FIGS. 9 to 11 each show, by way of example, the arrangement of two sound generating units in a housing. In some embodiments, as shown in FIGS. 9 to 10, the first diaphragm 221 and the second diaphragm 231 of the sound generating unit 21 are symmetrical with respect to a fourth plane of symmetry A4, which is perpendicular to the first plane of symmetry A1. In some embodiments, the positions of the first diaphragm 221 and the second diaphragm 231 need to be adjusted to change the position of the sound output hole 240 in the sound generating unit 21. 11 , the first diaphragm 221 and the second diaphragm 231 are adjusted to be symmetrical with respect to a fifth plane of symmetry A5, such that a tilt angle of less than 45 degrees is formed between the fifth plane of symmetry A5 and the fourth plane of symmetry A4, and the fifth plane of symmetry A5 is perpendicular to the first plane of symmetry A1. In some embodiments, when the first diaphragm 221 and the second diaphragm 231 are symmetrical with respect to the fourth plane of symmetry A4 or the fifth plane of symmetry A5, the central axis of the sound output hole 240 may overlap with the central axis of the first sound transmission passage 212, and the shape of the cross section of the sound output hole 240 taken along a direction perpendicular to its central axis is the same as the shape of the cross section of the first sound transmission passage 212 taken along a direction perpendicular to its central axis, and the inlet of the sound output hole 240 is aligned with the opening of the first sound transmission passage 212. In some other embodiments, to ensure that the sound emission hole 240 can face the ear canal when the ear cuff type earphone 200 tilts under the action of gravity, when the wearer is wearing the ear cuff type earphone 200, the sound emission hole 240 may be completely located on the side of the first symmetry plane A1 that is closer to the wearer's earlobe.

[0084] FIG. 12 is a schematic cross-sectional view of two audio drivers in a plane in the axial and radial directions of a first magnetic flux conducting cover according to some embodiments of the present specification. FIG. 13 is a plan view of the first audio driver, the second audio driver, and a mounting bracket when connected according to some embodiments of the present specification. As shown in FIGS. 3-4 and 12-13, the first audio driver 220 includes a first magnet 222 and a first magnetic flux conducting cover 223 spaced apart from a first vibrating membrane 221, and a first frame 224 supporting the first vibrating membrane 221, the first magnet 222, and the first magnetic flux conducting cover 223. The first frame 224 includes a plurality of first air vents 2241. The second audio driver 230 includes a second magnet 232 and a second magnetic flux conducting cover 233 spaced apart from a second vibrating membrane 231, and a second frame 234 supporting the second vibrating membrane 231, the second magnet 232, and the second magnetic flux conducting cover 233. The second frame 234 includes a plurality of second vent holes (not shown).

[0085] The first magnetic flux conducting cover 223 has an open end and a closed end, and the open end of the first magnetic flux conducting cover 223 is disposed facing the first vibrating membrane 221. The first magnet 222 is disposed within the first magnetic flux conducting cover 223, and one end of the first magnet 222 remote from the first vibrating membrane 221 is connected to the inner wall of the closed end of the first magnetic flux conducting cover 223. The first frame 224 surrounds the first vibrating membrane 221, and one end of the first frame 224 remote from the first vibrating membrane 221 is formed with a first mounting hole. The first magnetic flux conducting cover 223 passes through the first mounting hole, and the outer wall of the first magnetic flux conducting cover 223 is connected to the hole wall of the first mounting hole. The first frame 224, the first magnetic flux conducting cover 223, and the first vibrating membrane 221 together form a cavity, which is the rear cavity of the first audio driver 220. Similarly, the second magnetic flux conducting cover 233 has an open end and a closed end. The open end of the second magnetic flux conducting cover 233 is disposed facing the second diaphragm 231, the second magnet 232 is located within the second magnetic flux conducting cover 233, and one end of the second magnet 232 remote from the second diaphragm 231 is connected to the inner wall of the closed end of the second magnetic flux conducting cover 233. The second frame 234 surrounds the second diaphragm 231, and a second mounting hole is formed in the one end of the second frame 234 remote from the second diaphragm 231. The second magnetic flux conducting cover 233 passes through the second mounting hole, and the outer wall of the second magnetic flux conducting cover 233 is connected to the hole wall of the second mounting hole. The second frame 234, the second magnetic flux conducting cover 233, and the second diaphragm 231 together form a cavity, which is the rear cavity of the second audio driver 230.

[0086] The magnets (including the first magnet 222 and the second magnet 232) may be used to generate a magnetic field. When the strength of the magnetic field generated by the magnet changes, the corresponding diaphragm receives a force and changes, causing the corresponding diaphragm to vibrate. When the diaphragm vibrates, it vibrates the air in the first sound transmission passage 212, thereby generating sound waves. The magnetic flux conductive cover may be used to suppress magnetic leakage of the magnetic circuit assembly of the audio driver. The frame is mainly used to support and fix the magnetic circuit assembly of the audio driver.

[0087] In some embodiments, the materials for manufacturing the first magnetic flux conducting cover 223 and the second magnetic flux conducting cover 233 may include one or a combination of low carbon steel, silicon steel sheet, silicon steel sheet, and ferrite. In some embodiments, the first magnet 222, the first magnetic flux conducting cover 223, and the first frame 224 may be the same as or similar to the second magnet 232, the second magnetic flux conducting cover 233, and the second frame 234.

[0088] In some embodiments, the first frame 224 and the first magnetic flux conducting cover 223 may be connected by adhesive, snap connection, welding, rivet connection, etc. For example, in the embodiment shown in Fig. 12, the connection between the first frame 224 and the first magnetic flux conducting cover 223 may be connected and fixed with a sealant. The second frame 234 and the second magnetic flux conducting cover 233 may be connected by the same or similar connection method as in the above embodiments.

[0089] Note that the ventilation holes are not limited to being disposed on the frame. For example, the plurality of first ventilation holes 2241 may be disposed on the side wall of the first magnetic flux conducting cover 223, and the plurality of first ventilation holes 2241 may be disposed so as to surround the side wall of the first magnetic flux conducting cover 223. The plurality of second ventilation holes may be disposed on the side wall of the second magnetic flux conducting cover 233, and the plurality of second ventilation holes may be disposed so as to surround the side wall of the second magnetic flux conducting cover 233. In another example, the plurality of first ventilation holes 2241 may be disposed on the closed end of the first magnetic flux conducting cover 223, and the plurality of first ventilation holes 2241 may be disposed along the edge of the closed end of the first magnetic flux conducting cover 223. The plurality of second ventilation holes may be disposed on the closed end of the second magnetic flux conducting cover 233, and the plurality of second ventilation holes may be disposed along the edge of the closed end of the second magnetic flux conducting cover 233.

[0090] In some embodiments, the first audio driver 220 further includes a first magnetic flux conducting plate 225 mounted within the first frame 224, the first magnetic flux conducting plate 225 being connected to a side of the first magnet 222 that is closer to the first diaphragm 221 and used to adjust the distribution of the magnetic field generated by the first magnet 222. Similarly, the second audio driver 230 further includes a second magnetic flux conducting plate 235 mounted within the second frame 234, the second magnetic flux conducting plate 235 being connected to a side of the second magnet 232 that is closer to the second diaphragm 231 and used to adjust the distribution of the magnetic field generated by the second magnet 232. In some embodiments, the first magnetic flux conducting plate 225 and the second magnetic flux conducting plate 235 may be the same or similar.

[0091] In some embodiments, the first audio driver 220 further includes a first coil 226 disposed within the first frame 224, the first coil 226 disposed so as to surround a side wall of the first magnet 222, and one end of the first coil 226 connected to the first vibrating membrane 221. When a current is passed through the first coil 226 (for example, the first coil 226 is connected to a first pad 2242 of the first frame 224, and a current is passed through the first coil 226 via the first pad 2242), the first coil 226 vibrates due to the action of the magnetic field, thereby vibrating the first vibrating membrane 221. Similarly, the second audio driver 230 further includes a second coil 236 disposed within the second frame 234, the second coil 236 disposed so as to surround a side wall of the second magnet 232, and one end of the second coil 236 connected to the second vibrating membrane 231. When a current is passed through the second coil 236 (for example, the second coil 236 is connected to a second pad (not shown) of the second frame 234 and a current is passed through the second coil 236 via the second pad), the second coil 236 vibrates under the influence of the magnetic field, thereby vibrating the second vibrating membrane 231. In some embodiments, the first coil 226 and the second coil 236 may be the same or similar.

[0092] 5 and 12 , in some embodiments, the first frame 224 and the second frame 234 are identical and symmetrical with respect to the first plane of symmetry A1. The first magnetic flux conducting cover 223 and the second magnetic flux conducting cover 233 are identical and symmetrical with respect to the first plane of symmetry A1. The first coil 226 and the second coil 236 are identical and symmetrical with respect to the first plane of symmetry A1. Because the two frames, magnetic flux conducting covers, and coils of the sound generating unit 21 are identical and symmetrical, this effectively improves the reusability of each component of the sound generating unit 21, simplifies the types of materials required to manufacture the sound generating unit 21, and reduces costs and production difficulty. In some embodiments, the first magnetic flux conducting plate 225 and the second magnetic flux conducting plate 235 are identical and symmetrical about the first plane of symmetry A1, and the first magnet 222 and the second magnet 232 are identical and symmetrical about the first plane of symmetry A1, thereby further improving the reusability of each component of the sound generating unit 21, further simplifying the types of materials required to manufacture the sound generating unit 21, and further reducing costs and production difficulty.

[0093] 12 , the audio generating unit 21 further includes a mounting bracket 250, and the first audio driver 220 and the second audio driver 230 are both mounted on the mounting bracket 250. For example, the first frame 224 is connected to the mounting bracket 250. The first magnetic flux conductive plate 225, the first magnet 222, the first magnetic flux conductive cover 223, and the first diaphragm 221 of the first audio driver 220 are all connected to the mounting bracket 250 via the first frame 224, i.e., the first audio driver 220 is mounted to the mounting bracket 250 via the first frame 224. Similarly, the second frame 234 is connected to the mounting bracket 250. The second magnetic flux conductive plate 235, the second magnet 232, the second magnetic flux conductive cover 233 and the second vibrating membrane 231 of the second audio driver 230 are all connected to the mounting bracket 250 via the second frame 234, i.e., the second audio driver 230 is attached to the mounting bracket 250 via the second frame 234.

[0094] In some cases, both the first audio driver 220 and the second audio driver 230 are mounted on the same mounting bracket 250. For example, the mounting bracket 250 is mainly located between the first audio driver and the second audio driver, and the first transmission path cavity (i.e., the first audio transmission path 212) can be enclosed by some structures of the mounting bracket 250 and the first and second audio drivers. This simplifies the overall structure of the audio generating unit 21 and reduces the manufacturing cost of the audio generating unit 21. In addition, by simply designing the mounting bracket 250, the shared cavity of the first audio driver 220 and the second audio driver 230 can be adjusted, and the complex structure inside the housing 210 can be prevented from affecting the acoustic effect of the shared cavity.

[0095] In some embodiments, a sealant may be filled between the first frame 224, the second frame 234 and the mounting bracket 250 to ensure a tight connection between the mounting bracket 250 and the first frame 224, the second frame 234, and the sealant can provide a certain elastic buffer space when the entire structure consisting of the first audio driver 220, the second audio driver 230 and the mounting bracket 250 is assembled with the first rigid housing 214, thereby reducing the impact pressure between the parts.

[0096] In some embodiments, as shown in Figures 1 to 2 and 12, when the external shape of the housing 210 is a shape that fits into the concha cavity, such as a spindle, a sphere, or a spherical shape, the overall structure consisting of the first audio driver 220, the second audio driver 230, and the mounting bracket 250 can be designed to better fit the shape of the receiving cavity 211 of the housing 210, thereby ensuring the wearing comfort of the ear cuff type earphone 200 while improving the utilization efficiency of the receiving cavity 211 and further improving the sound generation efficiency of the sound generation unit 21.

[0097] 3 and 12 , the maximum distance in the axial direction of the structure formed by the first audio driver 220, the second audio driver 230, and the mounting bracket 250 is the first dimension. The maximum distance in the axial direction of the structure formed by the first audio driver 220, the second audio driver 230, and the mounting bracket 250 is the distance between the end face of the first magnetic flux conductive cover 223 remote from the first diaphragm 221 and the end face of the second magnetic flux conductive cover 233 remote from the second diaphragm 231, and this distance may be indicated as L1 in FIG. 12 . The maximum distance in the radial direction of the structure formed by the first audio driver 220, the second audio driver 230, and the mounting bracket 250 is the second dimension. In some embodiments, on the side remote from the opening of the first audio transmission passage 212, the outer peripheral wall of the mounting bracket 250 is flush with the outer side walls of the first frame 224 and the second frame 234. On the side closest to the opening of the first sound transmission passage 212, the protrusion 251 of the mounting bracket 250 protrudes from the outer walls of the first frame 224 and the second frame 234. Therefore, the maximum radial distance of the structure formed by the first sound driver 220, the second sound driver 230, and the mounting bracket 250 is the distance between the end face of the protrusion 251 of the mounting bracket 250 away from the first sound transmission passage 212 and the outer peripheral wall of the mounting bracket 250 away from the opening of the first sound transmission passage 212, and this distance may be indicated as L2 in FIG. 12 . In some embodiments, the ratio of the first dimension to the second dimension is in the range of 0.7 to 1.3. In some embodiments, the ratio of the first dimension to the second dimension is in the range of 0.85 to 1.15. In some embodiments, the ratio of the first dimension to the second dimension is in the range of 0.9 to 1.1. In some cases, the ratio between the first dimension and the second dimension may be reduced to allow the overall structure comprising the first audio driver 220, the second audio driver 230 and the mounting bracket 250 to better fit the shape of the receiving cavity 211.

[0098] In some application scenarios, the entire structure consisting of the first audio driver 220, the second audio driver 230, and the mounting bracket 250 may not be completely sealed to the inner wall of the housing 210, and in particular, there may be a certain gap between the outlet of the first audio transmission path 212 and the inlet of the sound output hole 240 (i.e., the end face of the sound output hole 240 close to the receiving cavity 211). In the process of sound entering the sound output hole 240 from the first audio transmission path 212, it may enter other audio transmission paths of the receiving cavity 211, such as the rear cavity of the audio driver, through the gap, and the corresponding vibrating membrane may not be able to generate effective vibrations, thereby degrading the sound quality emitted from the sound output hole 240. In this embodiment, a protrusion 251 is installed at a position corresponding to the sound emission hole 240 of the mounting bracket 250, and the protrusion 251 abuts against the inner wall of the housing 210, thereby isolating the first sound transmission passage 212 from other sound passages within the accommodating cavity 211, effectively preventing airflow leakage within the first sound transmission passage 212, and ensuring the sound quality emitted from the sound emission hole 240.

[0099] 12, the mounting bracket 250 has an annular structure. The first vibrating membrane 221 and the second vibrating membrane 231 are respectively installed on both sides of the mounting bracket 250 along the axial direction of the mounting bracket 250 to form the first audio transmission passage 212 with the mounting bracket 250, and the mounting bracket 250 can serve as the side wall of the first audio transmission passage 212. In addition, the first frame 224 and the second frame 234 are also respectively installed on both sides of the mounting bracket 250 to form rear cavities of the first audio driver 220 and the second audio driver 230, respectively. A protrusion 251 is provided at a position corresponding to the sound emission hole 240 of the mounting bracket 250 (i.e., the side of the mounting bracket 250 close to the sound emission hole 240), and the protrusion 251 protrudes from between the first frame 224 and the second frame 234 and abuts against the inner wall of the housing 210, isolating the first sound transmission passage 212 from other acoustic passages within the accommodating cavity 211 (e.g., the rear cavity of the audio driver).

[0100] FIG. 14 is a front view of a first audio driver, a second audio driver, and a mounting bracket when they are connected together according to some embodiments of the present specification. FIG. 15 is a schematic diagram of a first audio driver, a second audio driver, and a mounting bracket when they are connected together according to some other embodiments of the present specification. As shown in FIGS. 12 to 14 , a plurality of through holes 2511 are formed in a protrusion 251 of a mounting bracket 250. Reinforcing ribs 2512 are provided between adjacent through holes 2511. A first cross section of the through hole 2511 is flush with an end face of the first frame 224. A second cross section of the through hole 2511 is flush with an end face of the second frame 234. The first cross section of the through hole 2511 is an inner wall surface of the through hole 2511 that is close to the first frame 224. The second cross section of the through hole 2511 is an inner wall surface of the through hole 2511 that is close to the first frame 224. The end face of the first frame 224 is the end face of the first frame 224 that is closest to the second frame 234. The end face of the second frame 234 is the end face of the second frame 234 that is closest to the first frame 224.

[0101] For convenience of explanation, the overall structure composed of the first audio driver 220, the second audio driver 230, and the mounting bracket 250 is referred to as the first overall structure. When the first audio driver 220 and the second audio driver 230 are installed symmetrically, for example, symmetrically with respect to a first symmetry plane (for example, the first symmetry plane A1 in FIG. 3), after the first audio driver 220 is flipped 180 degrees with respect to the first symmetry plane, the end surface of the first frame 224 of the first audio driver 220 may be flush with the second cross section of the through-hole 2511. In this case, the overall structure (which may be referred to as the second overall structure) composed of the two first audio drivers 220 and the mounting bracket 250 remains unchanged compared to the first overall structure, which corresponds to the first audio driver 220 being reused as the second audio driver 230 in the second overall structure. Similarly, after the second audio driver 230 is flipped 180 degrees with respect to the first symmetry plane, the end surface of the second frame 234 of the second audio driver 230 may be flush with the first cross section of the through-hole 2511. In this case, the overall structure (which may be referred to as a third overall structure) formed by the two second audio drivers 230 and the mounting bracket 250 remains unchanged compared to the first overall structure, which corresponds to the second audio driver 230 being reused as the first audio driver 220 in the third overall structure. By installing in this manner, there is no need to separately produce and manufacture the first audio driver 220 and the second audio driver 230, and the first audio driver 220 and the second audio driver 230 can be reused with each other, which can effectively reduce manufacturing costs.

[0102] Furthermore, in this embodiment, the presence of the reinforcing rib 2512 effectively improves the structural strength of the protrusion 251 and prevents the mounting bracket 250 from being pressed and deformed. In some embodiments, the reinforcing rib 2512 is not an essential structure for the protrusion 251, and the purpose of providing the protrusion 251 is to isolate the first sound transmission passage 212 from other acoustic passages (e.g., the rear cavity of the audio driver) of the accommodating cavity (e.g., the accommodating cavity 211 in FIG. 3), so it is sufficient for the reinforcing rib 2512 to ensure acoustic communication between the first sound transmission passage 212 and the sound output hole 240 and isolate the first sound transmission passage 212 from other acoustic passages of the accommodating cavity. For example, in the embodiment shown in FIG. 15, the protrusion 251 may have an opening structure, and the side wall of the opening structure abuts against the inner wall of the housing (e.g., the housing 210 in FIG. 3).

[0103] FIG. 16 is a schematic assembly diagram of a first audio driver, a second audio driver, and a mounting bracket according to some embodiments of the present disclosure. As shown in FIGS. 14 to 16, the mounting bracket 250 may include the protrusion 251 of the above-described embodiments and a ring-shaped portion 252 connected to the protrusion 251, and the ring-shaped portion 252 has only one positioning structure. The positioning structure is configured to position the first frame 224, the second frame 234, and the mounting bracket 250 relative to each other, and is a combination of the positioning protrusion 253 and the positioning groove 254. By way of example only, the ring-shaped portion 252 may include a main body portion 2521, a first connecting portion 2522, and a second connecting portion 2523, and the first connecting portion 2522 is used to connect the main body portion 2521 and the first frame 224, and the second connecting portion 2523 is used to connect the main body portion 2521 and the second frame 234. The main body 2521 has two positioning protrusions 253, which are located on both sides of the main body 2521 along the axial direction of the annular portion 252 (as indicated by the arrows in FIG. 16 ). The first and second connecting portions 2522 and 2523 each have a positioning groove 254 that fits the positioning protrusions 253. When the two positioning protrusions 253 are fitted into the two positioning grooves 254, the first and second frames 224 and 234 and the mounting bracket 250 are aligned so that the first and second pads 2242 and 2342 correspond to each other, facilitating connection between the pads and external conductors and between the pads and coils. In other embodiments, the first and second frames 224 and 234 may be positioned relative to the mounting bracket 250 using other methods, such as a magnetic adsorption structure or a snap slot structure.

[0104] 3 and 12 to 13, a second sound transmission passage 213 is formed between the first frame 224 and the second frame 234. The side of the first vibrating membrane 221 remote from the first sound transmission passage 212 communicates with the second sound transmission passage 213 via a first air vent 2241. The side of the second vibrating membrane 231 remote from the first sound transmission passage 212 communicates with the second sound transmission passage 213 via a second air vent. For example only, an end face of first frame 224 remote from first diaphragm 221 and an end face of second frame 234 remote from second diaphragm 231 both have gaps with the inner wall of housing 210, so that a second audio transmission path 213 can be formed between first frame 224, second frame 234, and housing 210, and a cavity near the end face of first frame 224 remote from first diaphragm 221 can acoustically communicate with a cavity near the end face of second frame 234 remote from second diaphragm 231. A rear cavity of first audio driver 220 is formed between first diaphragm 221, first frame 224, and first magnetic flux conductive cover 223. A rear cavity of second audio driver 230 is formed between second diaphragm 231, second frame 234, and second magnetic flux conductive cover 233. The rear cavity of the first audio driver 220 and the rear cavity of the second audio driver 230 can be acoustically connected to the second audio transmission passage 213 through the first air vent 2241 and the second air vent, respectively. In this case, the rear cavity of the first audio driver 220, the rear cavity of the second audio driver 230 and the second audio transmission passage 213 can together form a single cavity, which can be the rear cavity of the audio generating unit 21, and corresponds to a shared rear cavity of the first audio driver 220 and the second audio driver 230.

[0105] In some cases, the rear cavity of the first audio driver 220 and the rear cavity of the second audio driver 230 are acoustically connected, and the airflow in the rear cavities of the two audio drivers can be released to the outside of the housing 210 through the same decompression hole (e.g., decompression hole 217 in Figure 18), thereby simplifying the overall structure of the audio generating unit 21 and reducing the manufacturing cost of the audio generating unit 21.

[0106] Fig. 17 is a schematic cross-sectional view of another audio generating unit in an axial and radial plane according to some embodiments of the present specification. The audio generating unit 31 differs from the audio generating unit 21 in Fig. 12 in that two audio drivers (a third audio driver 320 and a fourth audio driver 330) of the audio generating unit 31 in Fig. 17 share a rear cavity, and the rear cavities of the third audio driver 320 and the fourth audio driver 330 are acoustically connected to the sound output hole 340.

[0107] In some embodiments, the first audio driver 220 and the second audio driver 230 can share a front cavity and also a rear cavity, thereby further simplifying the overall structure of the audio generating unit 21 and reducing the manufacturing costs of the audio generating unit 21.

[0108] FIG. 18 is a schematic diagram of an ear cuff earphone according to some embodiments of the present disclosure. In some embodiments, as shown in FIG. 18, the ear cuff earphone 200 may further include a decompression hole 217. The decompression hole 217 is located in the housing 210 of the sound generating unit 21. As shown in FIGS. 1, 3, 16, and 18, when worn, the decompression hole 217 is located adjacent to the ear hook 27 of the housing 210 and at an opening facing the wearer's cavity of the concha 102. In some embodiments, the decompression hole 217 acoustically communicates with the second sound transmission passage 213 and also acoustically communicates with the rear cavities of the first sound driver 220 and the second sound driver 230, thereby discharging sound from the rear cavities to the outside, balancing the sound pressure within the rear cavities and allowing the diaphragm of the sound generating unit 21 to vibrate sufficiently at low frequencies and with large amplitudes, ensuring full low-frequency sound.

[0109] In some embodiments, as shown in FIGS. 16 and 18 , a plurality of first vent holes 2241 are provided on the end surface of the first frame 224 away from the first vibrating membrane 221, and the plurality of first vent holes 2241 are provided at intervals around the first magnetic flux conductive cover 223. A plurality of first pads 2242 are further provided on the end surface of the first frame 224 away from the first vibrating membrane 221. The first pads 2242 may be used to apply current to the first coil 226. The minimum distance between at least some of the first pads 2242 and the decompression holes 217 is a first minimum distance, and the minimum distance between at least some of the first vent holes 2241 and the decompression holes 217 is a second minimum distance, and the first minimum distance is greater than the second minimum distance. The distance between the first pads 2242 and the decompression holes 217 is the distance between the centroid of the first pads 2242 and the centroid of the decompression holes 217. The distance between first vent hole 2241 and decompression hole 217 is the distance between the centroid of first vent hole 2241 and the centroid of decompression hole 217 .

[0110] Similarly, a plurality of second vent holes (not shown) are provided on an end surface of second frame 234 remote from second vibrating membrane 231, and the plurality of second vent holes are provided at intervals around second magnetic flux conductive cover 233. A plurality of second pads (not shown) are further provided on an end surface of second frame 234 remote from second vibrating membrane 231. The second pads may be used to supply current to second coil 236. The minimum distance between at least some of the second pads and decompression holes 217 is a third minimum distance, and the maximum distance between at least some of the second vent holes and decompression holes 217 is a fourth minimum distance, and the third minimum distance is greater than the fourth minimum distance.

[0111] In some cases, by locating the first air vent 2241 and the second air vent closer to the decompression hole 217, the airflow in the rear cavities of the first audio driver 220 and the second audio driver 230 can be forced to exit through the decompression hole 217 via a shorter path, improving the efficiency of air pressure release in the rear cavities of the first audio driver 220 and the second audio driver 230 and improving the quality of sound generation.

[0112] In some other embodiments, the average distance from all of the first vent holes 2241 to the decompression holes 217 is a first average distance, and the average distance from all of the first pads 2242 to the decompression holes 217 is a second average distance, and the first average distance is smaller than the second average distance. The above two methods can also make the vent holes closer to the decompression holes 217 than the pads, so that the airflow in the rear cavity of the audio driver can be discharged through the decompression holes 217 via a shorter path, thereby improving the efficiency of decompression in the rear cavity.

[0113] In some embodiments, the first minimum distance may be less than 1.5 mm and the second minimum distance may be less than 0.8 mm. In some embodiments, the first minimum distance may be less than 1 mm and the second minimum distance may be less than 0.6 mm. Similarly, in some embodiments, the third minimum distance may be less than 1.5 mm and the fourth minimum distance may be less than 0.8 mm. In some embodiments, the third minimum distance may be less than 1 mm and the fourth minimum distance may be less than 0.6 mm.

[0114] In some embodiments, as shown in FIG. 18 , the decompression hole 217 may include a first end 2171, a second end 2172, and a connecting segment 2173 connecting the first end 2171 and the second end 2172, wherein the first end 2171, the second end 2172, and the connecting segment 2173 are disposed along the length of the decompression hole 217, and the minimum width of the first end 2171 and the second end 2172 is greater than the maximum width of the connecting segment 2173, such that the shape of the decompression hole 217 resembles a “bone shape.”

[0115] In some embodiments, the decompression holes 217 may be symmetrical with respect to the first plane of symmetry A1, as shown in Figures 1, 5, and 18. By arranging them in this manner, whether the ear cuff earphone 200 is worn on the wearer's left ear or right ear does not significantly affect the decompression effect of the decompression holes 217.

[0116] 1, 3, 16, and 18, when worn, the decompression hole 217 is located farther from the ear canal than the sound output hole 240, thereby reducing anti-phase cancellation at the ear canal between the sound output through the decompression hole 217 and the sound output through the sound output hole 240, and improving the volume of the sound heard by the wearer. In some embodiments, when the ear cuff earphone 200 is worn, the sound output hole 240 faces toward the ear canal and the decompression hole 217 faces away from the ear canal, and at the same time, the housing 210 of the sound generating unit 21 abuts against the inner wall of the cavity of the concha 102, thereby isolating the sound output hole 240 and the decompression hole 217, preventing sound waves emitted from the decompression hole 217 from interfering with sound waves emitted from the sound output hole 240, reducing sound short-circuiting, and improving sound generation quality.

[0117] 19 is a schematic cross-sectional view of the sound generating unit taken along a plane parallel to the first plane of symmetry according to some embodiments of the present specification. In some embodiments, as shown in FIGS. 5, 18, and 19, an arc-shaped recessed segment 271 is formed between the inner surface of the earhook 27 and the housing 210 of the sound generating unit 21 on the first plane of symmetry A1, and the projection of the decompression hole 217 onto the first plane of symmetry A1 is located on the arc-shaped recessed segment 271. The curvature of the arc-shaped recessed segment 271 is greater than a certain threshold, so that the inner contour of the vicinity of the connection position between the housing 210 and the earhook 27 corresponding to the arc-shaped recessed segment 271 has a sufficient recess, so that the decompression hole 217 located at this recessed position will not be covered by the auricle.

[0118] In some embodiments, the decompression hole 217 and the sound introduction hole 280 may be located on opposite sides of the ear hook 27. For example, when the ear cuff earphone 200 is worn, the decompression hole 217 may be located on the side of the ear hook facing the antihelix, and the sound introduction hole may be located on the side of the ear hook 27 facing the tragus, thereby improving the sound collection effect of the microphone assembly, and reducing mutual interference between the decompression hole 217 and the sound introduction hole 280 when they are located opposite each other.

[0119] Before connecting the first rigid housing 214 and the second rigid housing 215, it may be necessary to connect and fix the entire structure consisting of the two audio drivers and the mounting bracket 250 to the first rigid housing 214. To achieve the connection between the entire structure and the first rigid housing 214, in some embodiments, a first step structure 218 and a second step structure 219 are installed inside the housing 210, as shown in FIGS. 3 and 5 . The first step structure 218 abuts the first magnetic flux conducting cover 223 or the first frame 224. The second step structure 219 abuts the second magnetic flux conducting cover 233 or the second frame 234. By way of example only, the first step structure 218 and the second step structure 219 are installed on either side of a first plane of symmetry A1 on the inner wall of the first rigid housing 214, respectively, and the first step structure 218 and the second step structure 219 are symmetrical with respect to the first plane of symmetry A1. The first step structure 218 includes a first abutment stopper and a second abutment stopper. The first abutment stopper contacts the end face of the first magnetic flux conducting cover 223 that is remote from the first vibrating membrane 221. The second abutment stopper contacts the outer wall of the first magnetic flux conducting cover 223. The second step structure 219 includes a third abutment stopper and a fourth abutment stopper. The third abutment stopper contacts the end face of the second magnetic flux conducting cover 233 that is remote from the second vibrating membrane 231. The fourth abutment stopper contacts the outer wall of the second magnetic flux conducting cover 233.

[0120] The engagement between the first stopper and the third stopper can restrict the axial movement (direction parallel to the vibration of the diaphragm) of the entire structure made up of the two audio drivers and the mounting bracket 250. The engagement between the second stopper and the fourth stopper can restrict the radial movement (direction parallel to the radial direction of the first audio transmission path 212) of the entire structure made up of the two audio drivers and the mounting bracket 250 to one side of the ear hook 27. In addition, by providing a stepped structure to abut the first magnetic flux conducting cover 223 and the second magnetic flux conducting cover 233, the stepped structure can be prevented from covering the air vents, thereby improving the pressure reduction effect.

[0121] 3 are merely for illustrative purposes and do not limit the specific form of the structure that realizes the positioning of the audio driver and the housing 210. For example, the audio driver can be positioned with the housing 210 by a structure such as a magnetic attraction assembly, a snap slot assembly, a guide groove and guide rod assembly, etc.

[0122] In some embodiments, the housing 210 of the ear cuff earphone 200 is either made of a hard material (e.g., metal) or a flexible material (e.g., rubber). However, a housing 210 made of a hard material lacks wearing comfort, and a housing 210 made of a flexible material provides poor support and protection for the structure housed inside the housing 210, making it impossible to effectively meet the functional requirements of the ear cuff earphone 200. To solve the above problems, the internal cavity (i.e., the housing cavity 211) of the sound generating unit 21 of the ear cuff earphone 200 according to some embodiments of the present specification is formed by being surrounded by a hard material, and a flexible body 216 is provided on the surface of the housing 210 that comes into contact with the wearer's concha cavity, ensuring wearing comfort while improving support and protection for the components housed inside the housing 210 and further improving the sound quality of the ear cuff earphone 200.

[0123] 3 and 19, the housing 210 may include a first rigid housing 214, a second rigid housing 215, and a flexible body 216. The second rigid housing 215 is configured to be placed toward the wearer's concha cavity when worn. The flexible body 216 is configured to contact the wearer's concha cavity when worn. The first rigid housing 214 and the second rigid housing 215 surround the receiving cavity 211. The flexible body 216 covers the outer wall of the second rigid housing 215.

[0124] In this embodiment, the receiving cavity 211 is surrounded by the first hard housing 214 and the second hard housing 215, and since the first hard housing 214 and the second hard housing 215 are both made of a hard material, the first hard housing 214 and the second hard housing 215 can better support and fix the components (e.g., the first audio driver 220 and the second audio driver 230) within the receiving cavity 211, effectively preventing the receiving cavity 211 from being deformed due to external pressure and pressing against the components within the receiving cavity 211, thereby improving the structural strength of the sound generating unit 21 and sound quality. In addition, since the flexible body 216 covers the outer wall of the second hard housing 215, when the wearer is wearing the earphones, the flexible body 216 comes into contact with the wearer's concha, preventing the hard housings from directly contacting the concha and affecting the wearing feel, and effectively improving wearing comfort. Furthermore, since the flexible body 216 mainly covers the outer wall of the second hard housing 215, it has little effect on the external structure and internal space of the first hard housing 214, and the overall volume of the housing 210 can be reduced while ensuring comfortable wearing.

[0125] In some embodiments, the material from which first rigid housing 214 and second rigid housing 215 are fabricated may include plastic, metal, or other suitable material usable for earbud housing 210. In some embodiments, first rigid housing 214 and second rigid housing 215 may be fabricated from the same rigid material. In some embodiments, first rigid housing 214 and second rigid housing 215 may be fabricated from different rigid materials.

[0126] In some embodiments, the material from which the flexible body 216 is made may be, but is not limited to, silica gel, rubber, elastic resin, polyurethane material, polydimethylsiloxane, PVC, TPE, and the like.

[0127] 3 and 19 are for illustrative purposes only and do not limit the installation form of the flexible body 216 in the embodiments of this specification. In some embodiments, as shown in FIGS. 5 and 19, the flexible body 216 is installed on all exposed outer walls of the second rigid housing 215 except for the connection portion with the first rigid housing 214. In other embodiments, the flexible body 216 is installed on a partial area of ​​the exposed outer wall of the second rigid housing 215 except for the connection portion with the first rigid housing 214. As a mere example, the plane on which the outermost circular line of the end surface of flexible body 216 lies is first reference plane A6, and in a cross section perpendicular to first reference plane A6 and passing through the center of first reference plane A6 (for example, the cross section may be a cross section parallel to first symmetry plane A1, or the cross section may be first symmetry plane A1), the area of ​​second rigid housing 215 covered by flexible body 216 is 80% or more of the curved length segment of second rigid housing 215. In another example, the ear-hook symmetry plane (i.e., first symmetry plane A1) and the outermost circular line of the end surface of flexible body 216 have two intersection points, and in a cross section perpendicular to ear-hook symmetry plane A1 and passing through the two intersection points, the area of ​​second rigid housing 215 covered by flexible body 216 is 80% or more of the curved length segment of second rigid housing 215. The above two examples illustrate the proportion of the flexible body 216 in the second rigid housing 215 from two angles, respectively, and allow the flexible body 216 to cover a sufficiently large area of ​​the second rigid housing 215, thereby reducing or eliminating the possibility of the wearer coming into direct contact with the second rigid housing 215.

[0128] In some embodiments, the first rigid housing 214 and the second rigid housing 215 may be connected in a manner including bonding, welding, snap connection, magnetic attraction connection, etc. By way of example only, an end of the second rigid housing 215 is fixedly bonded to an end of the first rigid housing 214. The end of the second rigid housing 215 and the end of the first rigid housing 214 are fixed in a bonding manner, thereby forming a reliable and small-sized fixed relationship, and such a bonding manner is also convenient for assembly and reduces the assembly process.

[0129] 3 and 19, the flexible body 216 is installed on the outer wall of the second rigid housing 215, and therefore the thickness of the housing 210 in that portion is the sum of the thickness of the second rigid housing 215 and the thickness of the flexible body 216. The flexible body 216 is not installed on the outer wall of the first rigid housing 214, or the flexible body 216 is installed only on the portion of the outer wall of the first rigid housing 214 that is close to the second rigid housing 215 (for example, the connection portion between the first rigid housing 214 and the second rigid housing 215), and therefore the thickness of the housing 210 in that portion can be considered to be the same or approximately the same as the thickness of the first rigid housing 214. When the overall dimensions of the housing 210 are limited due to the small volume of the cavity of the concha, no flexible member is installed on the outer wall of the first hard housing 214, so the overall thickness of the housing 210 in that part can be reduced, which is equivalent to increasing the volume of the internal space of the first hard housing 214, and can accommodate a vibration membrane with a larger area, resulting in better acoustic effects.

[0130] Furthermore, since the internal space of the first rigid housing 214 is increased, the shape and size of the receiving cavity 211 are changed accordingly. In order to more fully utilize the internal space of the receiving cavity 211, it is necessary to adjust the arrangement of the first audio driver 220 and the second audio driver 230. The embodiments of this specification will describe the change in the arrangement of the first audio driver 220 and the second audio driver 230 with reference to Figures 10 and 19 and their embodiments.

[0131] In some embodiments, to fully utilize the internal space of the receiving cavity 211, the midpoint Q of the line connecting the center of the first vibrating membrane 221 and the center of the second vibrating membrane 231 may approximately overlap with the center of the receiving cavity 211. The center of the vibrating membrane is the centroid of the plane on which the vibrating membrane is located. "Almost overlapping" means that the distance between the two does not exceed a predetermined value, such as 5 mm, 3 mm, or 1 mm. For example, if the receiving cavity 211 is spherical and the axial and radial dimensions of the entire structure formed by the first audio driver 220, the second audio driver 230, and the mounting bracket 250 are close, the spatial dimensions of the receiving cavity 211 can be more fully utilized when the midpoint Q of the line connecting the center of the first vibrating membrane 221 and the center of the second vibrating membrane 231 overlaps with the center of the receiving cavity 211. If the flexible body 216 is not installed, the center of the housing 210 and the center of the receiving cavity 211 can be considered to essentially overlap. After flexible body 216 is installed on the outer wall of second rigid housing 215, the center position of the entire housing 210 changes, and therefore midpoint Q of the line connecting the centers of first vibrating membrane 221 and second vibrating membrane 231 also shifts from the center of the entire housing 210. Note that first vibrating membrane 221 and second vibrating membrane 231 do not have to be completely identical, and do not have to be completely symmetrical with respect to first plane of symmetry A1; for example, first vibrating membrane 221 and second vibrating membrane 231 may be almost identical. Also, for example, first vibrating membrane 221 and second vibrating membrane 231 are almost symmetrical with respect to first plane of symmetry A1 (i.e., not completely symmetrical).

[0132] In some embodiments, the plane on which the outermost annular line of the end surface of flexible body 216 is located is first reference plane A6, and midpoint Q of the line connecting the center of first vibrating membrane 221 and the center of second vibrating membrane 231 is located outside first reference plane A6. In the present embodiment, the plane on which the outermost annular line of the end surface of flexible body 216 is located corresponds to the boundary surface between the internal space of flexible body 216 and the internal space of first rigid housing 214. When the shape and dimensions of the internal space of flexible body 216 are the same or nearly the same as the shape and dimensions of the internal space of first rigid housing 214, midpoint Q of the line connecting the center of first vibrating membrane 221 and the center of second vibrating membrane 231 nearly overlaps with the center of accommodating cavity 211 and the center of housing 210, and midpoint Q of the line connecting the center of first vibrating membrane 221 and the center of second vibrating membrane 231 can be considered to be located on first reference plane A6 or have a small distance from first reference plane A6 in order to fully utilize the space of accommodating cavity 211. Because second rigid housing 215 is further installed within flexible body 216, the center of housing 210 is offset from the center of accommodating cavity 211, and therefore midpoint Q of the line connecting the center of first vibrating membrane 221 and the center of second vibrating membrane 231 is located outside first reference plane A6.

[0133] In some embodiments, the plane on which the outermost annular line of the end surface of second rigid housing 215 is located is a second reference plane (not shown), and midpoint Q of the line connecting the center of first vibrating membrane 221 and the center of second vibrating membrane 231 is located outside the second reference plane. The plane on which the outermost annular line of the end surface of second rigid housing 215 is located corresponds to the boundary surface between the internal space of second rigid housing 215 and the internal space of first rigid housing 214. When the shape and dimensions of the internal space of second rigid housing 215 are the same or nearly the same as the shape and dimensions of the internal space of first rigid housing 214 and flexible body 216 is not installed, midpoint Q of the line connecting the center of first vibrating membrane 221 and the center of second vibrating membrane 231 nearly overlaps with the center of accommodating cavity 211 and the center of housing 210, and therefore midpoint Q of the line connecting the center of first vibrating membrane 221 and the center of second vibrating membrane 231 can be considered to be located on the second reference plane or to be close to the second reference plane. After flexible body 216 covers the outer wall of second rigid housing 215, the center position of the entire housing 210 changes, and therefore midpoint Q of the line connecting the center of first vibrating membrane 221 and the center of second vibrating membrane 231 also shifts from the center of the entire housing 210. Therefore, midpoint Q of the line connecting the center of first vibrating membrane 221 and the center of second vibrating membrane 231 is located outside the second reference plane.

[0134] The above two embodiments respectively refer to the second rigid housing 215 and the flexible body 216 to explain the change in the position of the midpoint Q of the line connecting the center of the first vibrating membrane 221 and the center of the second vibrating membrane 231. This shows that the ear cuff type earphone 200 according to some embodiments of this specification can improve the utilization efficiency of the internal space of the housing 210 by rationally laying out the components inside the housing 210 of the sound generating unit 21 while ensuring wearing comfort.

[0135] As shown in Figures 5 and 19, in some embodiments, the projection onto the first plane of symmetry A1 of the midpoint of the line connecting the center of the first vibrating membrane 221 and the center of the second vibrating membrane 231 is a first projection point P1, the intersection line between the first reference plane A6 and the first plane of symmetry A1 is a first intersection line, and the distance between the first projection point P1 and the first intersection line is in the range of 0.4 mm to 4 mm.

[0136] In some embodiments, the projection of the inner wall of the receiving cavity 211 onto the first plane of symmetry A1 is a first projection, the projection of the first reference plane A6 onto the first plane of symmetry A1 is a second projection, the first projection and the second projection have a first intersection point P2 and a second intersection point P3, and the distance between the first intersection point P2 and the second intersection point P3 is an intersection distance. The first projection includes a first arc-shaped segment R1 and a second arc-shaped segment R2, and the ratio of the first arc-shaped segment R1 to the second arc-shaped segment R2 to the intersection distance is 1.4 to 1.7. Since the ratios of the first arc-shaped segment R1 and the second arc-shaped segment R2 to the intersection distance are all 1.4 to 1.7, the first arc-shaped segment R1 and the second arc-shaped segment R2 are both approximately semicircular, that is, the projection of the accommodating cavity 211 onto the first symmetry plane A1 is closer to a sphere, thereby making the overall shape of the sound generating unit 21 spherical or approximately spherical, which makes the sound generating unit 21 better fit the cavity of the concha and improves the wearing comfort of the ear cuff-type earphone 200.

[0137] In some embodiments, sound emission holes 240 may be located in first rigid housing 214. In some embodiments, sound emission holes 240 may be located in second rigid housing 215 and flexible body 216. In some embodiments, sound emission holes 240 may be located in first rigid housing 214, second rigid housing 215, and flexible body 216 simultaneously.

[0138] 2 and 3, the sound emitting hole 240 is located in the second rigid housing 215 and the flexible body 216. By locating it in this manner, the sound emitting hole 240 does not need to penetrate the first rigid housing 214 and the second rigid housing 215 at the same time, and it is possible to avoid an uneven surface of the sound emitting hole 240 affecting the attachment of the housing 210. Meanwhile, when the ear cuff type earphone 200 is worn, the sound emitting hole 240 is closer to the ear canal, which can effectively improve the quality of sound generation.

[0139] In another example, the sound emitting holes 240 may be located in the first rigid housing 214. In this way, the sound emitting holes 240 do not need to penetrate the first rigid housing 214 and the second rigid housing 215 at the same time, which can avoid the surface of the sound emitting holes 240 being uneven and affecting the installation of the housing 210. In addition, since the sound emitting holes 240 are located in the first rigid housing 214, there is no need to form holes in the flexible body 216, and there is no need to consider the effect of the flexible body 216 on the sound emitting holes 240, which can reduce design and production costs.

[0140] Although the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure above is merely illustrative and does not limit the present application. Although not expressly described herein, those skilled in the art may make various changes, improvements, and modifications to the present application. These changes, improvements, and modifications are intended to be suggested by the present application and therefore fall within the spirit and scope of the exemplary embodiments of the present application. [Explanation of symbols]

[0141] 21 Sound generation unit 26 Contact part 27 Ear hooks 200 Ear cuff type earphones 210 Housing 211 Storage Cavity 212 First Audio Transmission Channel 213 Second Audio Transmission Channel 214 First hard housing 215 Second hard housing 216 Flexible body 217 Decompression hole 220 1st Audio Driver 221 First diaphragm 222 First Magnet 223 First magnetic flux conduction cover 224 1st Frame 226 First Coil 230 Second Audio Driver 231 Second diaphragm 232 Second Magnet 233 Second magnetic flux conducting cover 234 2nd Frame 236 Second Coil 240 Sound emission hole 250 mounting bracket 280 Audio inlet

Claims

1. a housing having a receiving cavity; the first audio driver and the second audio driver, both housed in the housing cavity, with a first audio transmission path formed between a first diaphragm of the first audio driver and a second diaphragm of the second audio driver; a sound generating unit located in the housing, acoustically communicating with the first sound transmission passage and including a sound emitting hole for emitting sounds generated by the first sound driver and the second sound driver, the sound generating unit being configured to be inserted into the cavity of the concha of the wearer when worn; a contact portion configured to contact the back of the wearer's ear when worn; An ear cuff type earphone including an ear hook configured to connect the sound generating unit and the contact unit by bypassing the wearer's antihelix and helix when worn.

2. 2. The ear cuff type earphone according to claim 1, wherein the ear hook has a first plane of symmetry, the first diaphragm and the second diaphragm are respectively located on both sides of the first plane of symmetry, and the first diaphragm and the second diaphragm are symmetrical with respect to the first plane of symmetry.

3. The ear cuff type earphone according to claim 2 , wherein the first plane of symmetry passes through the sound emission hole.

4. 2. The ear cuff type earphone according to claim 1, wherein the ear hook has a first plane of symmetry, the first diaphragm and the second diaphragm are symmetrical with respect to a second plane of symmetry, and an inclination angle of less than 45 degrees is formed between the first plane of symmetry and the second plane of symmetry.

5. 2. The ear cuff type earphone according to claim 1, wherein the sound emission hole is symmetrical with respect to a third plane of symmetry, the third plane of symmetry being perpendicular to an inner wall of the cavity of the concha, and an inclination angle of less than 45 degrees is formed between the first plane of symmetry and the third plane of symmetry.

6. The ear cuff type earphone according to claim 4 or 5, wherein when the wearer is wearing the ear cuff type earphone, the sound emission hole is completely located on the side of the first symmetry plane that is closest to the wearer's earlobe.

7. 2. The ear cuff type earphone according to claim 1, wherein the ear hook has a first plane of symmetry, the first diaphragm and the second diaphragm are symmetrical with respect to a fourth plane of symmetry, and the fourth plane of symmetry is perpendicular to the first plane of symmetry.

8. The ear cuff type earphone according to claim 7, wherein when the wearer is wearing the ear cuff type earphone, the sound emission hole is completely located on the side of the first symmetry plane that is closest to the wearer's earlobe.

9. 8. The ear cuff type earphone according to claim 7, wherein a central axis of the sound emitting hole overlaps with a central axis of the first sound transmission passage, a cross-sectional shape of the sound emitting hole taken along a direction perpendicular to its central axis is the same as a cross-sectional shape of the first sound transmission passage taken along a direction perpendicular to its central axis, and an inlet of the sound emitting hole is aligned with an opening of the first sound transmission passage.

10. The ear cuff type earphone according to claim 1 , wherein the first sound transmission path is a front cavity shared by the first diaphragm and the second diaphragm.

11. the first audio driver includes a first magnet and a first magnetic flux conductive cover that are spaced apart from the first diaphragm in this order, and a first frame that supports the first diaphragm, the first magnet, and the first magnetic flux conductive cover; 11. The ear cuff earphone according to claim 10, wherein the second audio driver includes a second magnet and a second magnetic flux conductive cover arranged in sequence and spaced apart from the second diaphragm, and a second frame supporting the second diaphragm, the second magnet, and the second magnetic flux conductive cover.

12. 12. The ear cuff type earphone according to claim 11, wherein a second sound transmission passage is formed between the first frame and the second frame, the first frame including a plurality of first air vents, the second frame including a plurality of second air vents, the side of the first diaphragm remote from the first sound transmission passage communicating with the second sound transmission passage via the plurality of first air vents, and the side of the second diaphragm remote from the first sound transmission passage communicating with the second sound transmission passage via the plurality of second air vents.

13. The ear cuff earphone of claim 11 , wherein the audio generating unit further includes a mounting bracket, and the first audio driver and the second audio driver are both mounted to the mounting bracket.

14. The ear cuff type earphone according to claim 13, wherein a protrusion is provided on the mounting bracket at a position corresponding to the sound emission hole, and the protrusion abuts against an inner wall of the housing.

15. 15. The ear cuff type earphone according to claim 14, wherein a through hole is formed in the protrusion, a first cross section of the through hole is flush with an end face of the first frame, and a second cross section of the through hole is flush with an end face of the second frame.

16. 15. The ear cuff earphone of claim 14, wherein the mounting bracket includes the protrusion and a ring-shaped portion connected to the protrusion, the ring-shaped portion having only one positioning structure, the positioning structure being configured to position the first frame and the second frame with the mounting bracket, and the positioning structure being a combination of a positioning protrusion and a positioning groove.

17. 14. The ear cuff earphone of claim 13, wherein a maximum axial distance of a structure formed by the first audio driver, the second audio driver, and the mounting bracket is a first dimension, a maximum radial distance of a structure formed by the first audio driver, the second audio driver, and the mounting bracket is a second dimension, and a ratio of the first dimension to the second dimension is in a range of 0.85 to 1.

15.

18. The ear cuff type earphone according to claim 12, wherein the housing is provided with a decompression hole that is acoustically connected to the second sound transmission passage.

19. a plurality of first pads are installed on an end surface of the first frame away from the first vibration membrane, a minimum distance between at least some of the first pads and the decompression holes is a first minimum distance, a minimum distance between at least some of the air vents and the decompression holes is a second minimum distance, and the first minimum distance is greater than the second minimum distance; 19. The ear cuff type earphone according to claim 18, wherein a plurality of second pads are provided on an end surface of the second frame remote from the second diaphragm, the minimum distance between at least some of the second pads and the decompression holes is a third minimum distance, and the maximum distance between at least some of the second air vent holes and the decompression holes is a fourth minimum distance, and the third minimum distance is greater than the fourth minimum distance.

20. The ear cuff type earphone according to claim 18, wherein the ear hook has a first plane of symmetry, and the sound emission hole, the first sound transmission passage and the decompression hole are all symmetrical with respect to the first plane of symmetry.

21. The ear cuff earphone according to claim 18, wherein the decompression hole and the sound emission hole are acoustically isolated by the inner wall of the cavity of the concha when the ear cuff earphone is worn.

22. 19. The ear cuff type earphone according to claim 18, wherein the decompression hole includes a first end, a second end, and a connecting segment connecting the first end and the second end, the first end, the second end, and the connecting segment being arranged along the length of the decompression hole, and the minimum width of the first end and the second end is greater than the maximum width of the connecting segment.

23. The ear cuff earphone according to claim 11, wherein a first step structure and a second step structure are provided inside the housing, the first step structure abutting the first magnetic flux conducting cover or the first frame of the first audio driver, and the second step structure abutting the second magnetic flux conducting cover or the second frame of the second audio driver.

24. the first step structure includes a first abutment stopper and a second abutment stopper, the first abutment stopper being in contact with an end surface of the first magnetic flux conducting cover that is remote from the first vibration membrane, and the second abutment stopper being in contact with an outer wall of the first magnetic flux conducting cover; 24. The ear cuff type earphone according to claim 23, wherein the second step structure includes a third stopper and a fourth stopper, the third stopper abutting an end face of the second magnetic flux conducting cover away from the second diaphragm, and the fourth stopper abutting an outer wall of the second magnetic flux conducting cover.

25. The ear cuff earphone according to claim 13, wherein a sealant is filled between the first frame, the second frame and the mounting bracket.

26. 2. The ear cuff-type earphone according to claim 1, wherein the resonant frequency of the first vibrating membrane and the resonant frequency of the second vibrating membrane are both lower than 300 Hz, and the difference between the resonant frequency of the first vibrating membrane and the resonant frequency of the second vibrating membrane is smaller than 50 Hz.

27. the first audio driver further includes a first coil installed in the first frame, the first coil installed to surround a side wall of the first magnet, and one end of the first coil connected to the first diaphragm; the second audio driver further includes a second coil installed in the second frame, the second coil installed to surround a side wall of the second magnet, and one end of the second coil connected to the second diaphragm; 12. The ear cuff earphone according to claim 11, wherein the ear hook has a first plane of symmetry, the first frame and the second frame are identical and symmetrical with respect to the first plane of symmetry, the first magnetic flux conducting cover and the second magnetic flux conducting cover are identical and symmetrical with respect to the first plane of symmetry, and the first coil and the second coil are identical and symmetrical with respect to the first plane of symmetry.

28. The housing includes: a first rigid housing; a second hard housing configured to be placed toward the wearer's concha cavity when worn; and a flexible body configured to contact the cavity of the concha of the wearer when worn; The ear cuff type earphone according to claim 1 , wherein the first hard housing and the second hard housing surround the receiving cavity, and the flexible body covers an outer wall of the second hard housing.

29. 29. The ear cuff type earphone according to claim 28, wherein the plane on which the outermost annular line of the end surface of the flexible body is located is a first reference plane, and the midpoint of the line connecting the center of the first diaphragm and the center of the second diaphragm is located outside the first reference plane, or the plane on which the outermost annular line of the end surface of the second rigid housing is located is a second reference plane, and the midpoint of the line connecting the center of the first diaphragm and the center of the second diaphragm is located outside the second reference plane.

30. The ear hook has a first plane of symmetry, a projection of a midpoint of a line connecting the center of the first diaphragm and the center of the second diaphragm onto the first plane of symmetry is a first projection point, an intersection line between the first reference plane and the first plane of symmetry is a first intersection line, and a distance between the first projection point and the first intersection line is within a range of 0.4 mm to 4 mm.

31. 29. The ear cuff type earphone according to claim 28, wherein the sound emission holes are located in the second rigid housing and the flexible body.

32. 30. The ear cuff type earphone of claim 29, wherein a projection of the inner wall of the receiving cavity onto the first plane of symmetry is a first projection, a projection of the first reference surface onto the first plane of symmetry is a second projection, the first projection and the second projection have a first intersection point and a second intersection point, a distance between the first intersection point and the second intersection point is an intersection distance, the first projection includes a first arc-shaped segment and a second arc-shaped segment, and a ratio of the first arc-shaped segment to the intersection distance and the second arc-shaped segment to the intersection distance is both 1.4 to 1.

7.

33. 2. The ear cuff type earphone according to claim 1, further comprising a microphone assembly, the microphone assembly being installed within the ear hook, the microphone assembly forming a third sound transmission passage, a sound introduction hole being installed on the side of the ear hook that is close to the sound generating unit, the sound introduction hole acoustically communicating with the third sound transmission passage, the ear hook having a first symmetry plane, and the sound introduction hole being symmetrical with respect to the first symmetry plane.

Images