Earphone

Abstract

The utility model provides an earphone, and relates to the technical field of sound production instruments. The earphone comprises a shell and an electro-acoustic transducer arranged in the shell, wherein the electro-acoustic transducer is provided with a hollow channel which is through along the axial direction of the electro-acoustic transducer; the shell is provided with a first sound outlet hole and an end face hole, the first sound outlet hole and the end face hole are located on the two sides of the hollow channel respectively, the first sound outlet hole is communicated with the hollow channel, and the end face hole is connected with the hollow channel and communicated with the external environment. A first resonant cavity communicated with the first sound outlet hole is formed in the earphone; the first resonant cavity, the hollow channel and the end face hole form a first Helmholtz resonant system; a second resonant cavity is formed in the shell, the shell is provided with a second sound outlet hole, the second resonant cavity is communicated with the rear tuning hole and the second sound outlet hole, and the second resonant cavity and the second sound outlet hole form a second Helmholtz resonance system; the end face hole and the second sound outlet hole form a dipole sound source in a preset frequency range. Sound leakage of the earphone can be prevented, and the privacy of the earphone is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of sound-generating instruments, and in particular to an earphone. Background Art

[0002] Headphones have been widely used in people's daily life. They can be used with mobile phones, computers and other electronic devices. According to the way users wear headphones, they can generally be divided into headphones and in-ear headphones. Among them, headphones can be divided into earmuff headphones or on-ear headphones. Earmuff headphones or on-ear headphones can provide better sound quality than in-ear headphones, but long-term wearing will keep the ears and ear canals in a closed environment for a long time, and the wearing experience is poor.

[0003] In the related art, air holes are usually provided on the earphone to form an open earphone to prevent the ear and the ear canal from being in a closed environment for a long time. However, this solution may cause the earphone to leak sound and the privacy is poor. Utility Model Content

[0004] An embodiment of the present application provides an earphone that can prevent sound leakage from the earphone and improve the privacy of the earphone.

[0005] The embodiment of the present application provides an earphone, comprising a shell and an electroacoustic transducer, wherein the electroacoustic transducer is arranged in the shell, and the electroacoustic transducer is provided with a hollow channel penetrating along its own axis;

[0006] The shell has a first sound outlet hole and an end hole, the first sound outlet hole is located on a side of the shell facing the ear, the first sound outlet hole is connected to the hollow channel, and the end hole is located on a side of the shell facing away from the ear and is connected to the external environment and the hollow channel respectively;

[0007] A first resonance cavity is formed on a side of the earphone facing the ear, the first resonance cavity is connected to the first sound outlet hole, and when the earphone is worn, the first resonance cavity covers the ear; the first resonance cavity is connected to the end surface hole through the hollow channel, so that the first resonance cavity, the hollow channel and the end surface hole form a first Helmholtz resonance system;

[0008] A second resonance cavity is also formed in the shell, and a second sound outlet hole is provided on a side of the shell away from the ear, the second resonance cavity is connected to the rear tuning hole of the electroacoustic transducer and the second sound outlet hole, and the second resonance cavity and the second sound outlet hole form a second Helmholtz resonance system;

[0009] Wherein, the end surface hole and the second sound outlet hole constitute a dipole sound source within a preset frequency range.

[0010] The earphones provided in the embodiment of the present application are provided with a hollow channel connected to the first sound outlet hole on the electroacoustic transducer, and an end surface hole connected to the hollow channel is provided on the shell. In this way, the first sound outlet hole is connected to the end surface hole through the hollow channel, thereby realizing the connection between the first sound outlet hole and the external environment. This can not only provide an open listening environment for the ear, allowing the user to listen to music while monitoring external sounds, thereby meeting the different listening needs of the user, but also dissipate the heat inside the earphone to keep the ear comfortable.

[0011] Furthermore, by setting a first resonance cavity, a hollow channel and an end hole to form a first Helmholtz resonance system, and by setting a second resonance cavity and a second sound outlet hole to form a second Helmholtz resonance system, the sound emitted in front of the diaphragm of the electroacoustic transducer can be radiated through the end hole of the first Helmholtz resonance system, and the sound emitted behind the diaphragm of the electroacoustic transducer can be radiated through the second sound outlet hole of the second Helmholtz resonance system. In this way, the end hole and the second sound outlet hole can form a dipole sound source within a preset frequency range, so that the sound in the far sound field is smaller, thereby preventing the sound of the earphones from leaking out, improving the privacy of the earphones, and protecting the privacy of the user.

[0012] In addition, by providing a hollow channel in the electroacoustic transducer, the path length of the airflow or sound flowing between the first sound outlet and the end hole can be minimized, thereby effectively improving the transparency of the earphone.

[0013] In a possible implementation, the first Helmholtz resonance system has a first Helmholtz resonance frequency f1, and the second Helmholtz resonance system has a second Helmholtz resonance frequency f2; wherein |f1-f2|≤300 Hz.

[0014] When the absolute value of the difference between the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 is less than or equal to 300 Hz, the sound emitted approximately satisfies a dipole sound source, so that the sound emitted by the end hole and the second sound outlet produces an anti-phase sound field superposition in the far field of the earphone, reducing the loudness and clarity of the sound, so that other people who are far away from the earphone cannot hear the sound emitted by the earphone clearly, thereby preventing the sound of the earphone from leaking out and protecting the privacy of the user.

[0015] In a possible implementation, the first Helmholtz resonance system has a first Helmholtz resonance frequency f1, and the second Helmholtz resonance system has a second Helmholtz resonance frequency f2, wherein f1≥5000 Hz and f2≥5000 Hz.

[0016] Such an arrangement can ensure that the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 are large enough, so that the frequency response curve of the end surface hole of the resonance frequency and the frequency response curve of the second sound outlet hole are approximately the same, so that the two frequency response curves have similar amplitudes and opposite phases, and then the sound emitted by the end surface hole and the second sound outlet hole approximately meets the conditions of a dipole sound source.

[0017] In a possible implementation, a communication channel is formed in the shell, and the communication through hole communicates the hollow channel and the end hole.

[0018] By setting a connecting channel between the hollow channel and the end hole, the first resonance cavity, the hollow channel, the connecting channel and the end hole form a first Helmholtz resonance system. The resonance frequency f1 of the first Helmholtz resonance system can be conveniently and reasonably adjusted so that f1 is as close to the high frequency as possible. In a possible implementation, the shell also includes an outer side wall arranged opposite to the electroacoustic transducer, the end hole is arranged on the outer side wall, and the outer side wall is formed with a first annular protrusion surrounding the end hole and protruding toward the hollow channel, and the first annular protrusion defines the connecting channel.

[0019] By defining the connecting channel through the first annular protrusion on the outer wall, the position and area of ​​the connecting channel can be defined more accurately, thereby achieving air flow conduction between the end hole and the hollow channel, dissipating the heat inside the earphone, and keeping the ear comfortable.

[0020] In a possible implementation, the shell further includes an outer side wall arranged opposite to the electroacoustic transducer, the end hole is arranged on the outer side wall, the earphone further includes a middle shell, the middle shell cover is arranged on the electroacoustic transducer to define a middle shell channel and the second resonance cavity that are not connected to each other, the middle shell channel is connected to the hollow channel, the middle shell is provided with a connecting hole connected to the middle shell channel, the connecting hole is connected to the end hole, and the middle shell channel and the connecting hole define the connecting channel.

[0021] By additionally arranging a middle shell, and using the middle shell channel and the connecting hole of the middle shell to define the connecting channel, the shape of the middle shell can be adjusted according to actual needs, and then the area of ​​the connecting channel can be adjusted, which is equivalent to reasonably adjusting the area of ​​the connecting channel in the first Helmholtz resonance system; when the sound emitted from the front of the diaphragm of the electroacoustic transducer is radiated through the end surface of the first Helmholtz resonance system, the standing wave frequency and the resonance frequency generated by the end surface can be optimized, and then the frequency response curve of the sound signal generated by the earphone can be optimized, so that the sound in the far sound field is smaller, which prevents the sound of the earphone from leaking out, improves the privacy of the earphone, and protects the privacy of the user.

[0022] In a possible implementation, the middle shell includes a middle shell bottom wall arranged opposite to the electroacoustic transducer, the communicating hole is arranged on the middle shell bottom wall, the middle shell bottom wall is formed with a second annular protrusion surrounding the communicating hole and protruding toward the hollow channel, and the second annular protrusion defines the middle shell channel.

[0023] The inner cavity of the middle shell is divided into two parts by the second annular convex portion, wherein the part arranged opposite to the hollow channel is the middle shell channel. Such an arrangement can shorten the middle shell channel in a direction perpendicular to the axis of the electroacoustic transducer, thereby shortening the length of the transmission path between the hollow channel and the end hole, and can allow the heat in the shell to diffuse to the external environment through the end hole as quickly as possible, which can not only avoid heat accumulation in the earphone and improve the service life of various parts of the earphone; but also keep the ear in a comfortable state.

[0024] In a possible implementation manner, the middle shell is provided with a sound outlet communication hole communicating with the second resonance cavity, and the sound outlet communication hole is communicated with the second sound outlet hole.

[0025] This embodiment can shorten the length of the transmission channel in the second Helmholtz resonance system. When the sound emitted from the rear of the diaphragm of the electroacoustic transducer is radiated through the second sound outlet of the second Helmholtz resonance system, the standing wave frequency and the resonance frequency generated by the second sound outlet can be optimized, thereby optimizing the frequency response curve of the sound signal generated by the earphone, making the sound in the far sound field smaller, thereby preventing the sound of the earphone from leaking out, improving the privacy of the earphone, and protecting the privacy of the user.

[0026] In a possible implementation, the sound outlet communication hole is arranged on the bottom wall of the middle shell, and the second sound outlet hole is arranged in a region of the outer side wall opposite to the sound outlet communication hole.

[0027] Such an arrangement can not only shorten the length of the transmission channel in the second Helmholtz resonance system as much as possible, but also facilitate the preparation of the sound outlet connecting hole and the second sound outlet hole.

[0028] In a possible implementation manner, the bottom wall of the middle shell is in contact with the outer side wall.

[0029] In the embodiment of the present application, the bottom wall of the middle shell is fitted with the outer wall so that there is no gap between the bottom wall of the middle shell and the outer wall; on the one hand, when the heat in the shell is transmitted to the connecting hole, it can be diffused to the external environment through the end hole as quickly as possible, thereby shortening the length of the transmission path between the hollow channel and the end hole, avoiding heat accumulation in the earphone, and improving the service life of each part of the earphone and the comfort of the user's ears.

[0030] On the other hand, the bottom wall of the middle shell fits with the outer wall, and the outer wall can also be used to provide support for the bottom wall of the middle shell, which can increase the contact area between the bottom wall of the middle shell and the outer wall, thereby increasing the connection strength between the middle shell and the shell.

[0031] In a possible implementation, the hollow channel, the connecting channel and the end hole together define a second channel, and the length of the second channel is less than or equal to 43 mm.

[0032] By shortening the length of the second channel, on the one hand, the resonance frequency f1 of the first Helmholtz resonance system and the resonance frequency f2 of the second Helmholtz resonance system can be as large as possible, and then f1 and f2 can be as close to the high frequency as possible, so as to ensure that the sound signal radiated by the end hole and the second sound outlet hole meets the conditions of a dipole sound source in a wider frequency band. On the other hand, the conductivity between the first resonance cavity and the external environment can be improved, and the comfort of the user's ears can be improved.

[0033] In a possible implementation manner, a volume of the first resonance cavity is less than or equal to 55 cubic centimeters.

[0034] The resonance frequency f1 of the first Helmholtz resonance system is inversely proportional to the volume of the first resonance cavity. Based on this, the volume of the first resonance cavity is set in this embodiment to ensure that the volume of the first resonance cavity is small enough so that the resonance frequency f1 of the first Helmholtz resonance system is as close to high frequency as possible.

[0035] In a possible implementation, a volume of the second resonance cavity is between 6 cubic centimeters and 55 cubic centimeters.

[0036] Such a setting can ensure that the second Helmholtz resonance frequency f2 is as close to the high frequency as possible, and is more convenient to adjust to be approximately the same as the first Helmholtz resonance frequency f1, so that the sound in the far sound field is smaller, which prevents the sound of the earphone from leaking out and protects the privacy of the user. It can also prevent the volume of the second resonance cavity 140 from being too small, ensuring the compactness of the earphone.

[0037] In a possible implementation manner, an opening area of ​​the second sound outlet hole is greater than or equal to 15 square millimeters.

[0038] In a possible implementation manner, along the axial direction of the electroacoustic transducer, a length of the second sound outlet hole is between 1 mm and 55 mm.

[0039] Such an arrangement can ensure that the second Helmholtz resonance frequency f2 is as close to the high frequency as possible, and is more convenient to adjust to be approximately the same as the first Helmholtz resonance frequency f1.

[0040] In a possible implementation manner, a minimum distance between the end surface hole and the second sound outlet hole in a radial direction of the electroacoustic transducer is between 7 mm and 28 mm.

[0041] This spacing can not only ensure that the sounds emitted by the end hole and the second sound outlet are well offset in the far sound field, reducing sound leakage of the earphone to the outside; it can also avoid increasing the size of the shell, making it easier to carry.

[0042] In a possible implementation, the earphone further includes an opening and closing component, which is disposed on the electroacoustic transducer and is used to open or close the hollow channel.

[0043] When the opening and closing component is closed, a closed listening environment can be provided for the ear, meeting the user's needs for an immersive experience; when the opening and closing component is opened, the first sound outlet is connected to the end surface hole through the hollow channel, so that the first sound outlet is connected to the external environment, thereby providing an open listening environment for the ear, allowing the user to listen to music while monitoring external sounds, meeting the user's different listening needs, and also dissipating the heat inside the earphone to keep the ear comfortable. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0045] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0046] Figure 1 A stereoscopic diagram of the earphone in an open state according to an embodiment of the present application;

[0047] Figure 2 A cross-sectional view of the earphone provided in the embodiment of the present application Figure 1 ;

[0048] Figure 3 A frequency response curve diagram of the sound emitted by the front face portion without adjusting the parameters and a frequency response curve diagram of the sound emitted by the second sound outlet are provided for this embodiment;

[0049] Figure 4 A frequency response curve diagram of the sound emitted by the rear end face and a frequency response curve diagram of the sound emitted by the second sound outlet hole are provided for this embodiment;

[0050] Figure 5A cross-sectional view of the earphone provided in the embodiment of the present application Figure 2 ;

[0051] Figure 6 A cross-sectional view of the earphone provided in the embodiment of the present application Figure 3 ;

[0052] Figure 7 A cross-sectional view of the earphone provided in the embodiment of the present application Figure 4 ;

[0053] Figure 8 A stereoscopic diagram of the earphone in a closed state according to an embodiment of the present application;

[0054] Fig. 9 A cross-sectional view of the earphone provided in the embodiment of the present application Figure 5 ;

[0055] Fig.10 A schematic diagram of a plastic bracket provided in an embodiment of the present application.

[0056] Description of reference numerals:

[0057] 10: Ear;

[0058] 100: housing; 110: first sound outlet; 120: end hole; 130: communication channel; 140: second resonance cavity; 150: second sound outlet; 160: outer wall; 161: first annular protrusion; 170: base; 171: third annular protrusion; 180: housing;

[0059] 200: electroacoustic transducer; 210: hollow channel; 220: rear tuning hole;

[0060] 300: First resonance cavity;

[0061] 400: middle shell; 410: middle shell channel; 420: communication hole; 430: middle shell bottom wall; 440: middle shell side wall; 450: second annular protrusion; 460: sound outlet communication hole;

[0062] 500: second channel;

[0063] 600: opening and closing components;

[0064] 700: ear pads;

[0065] 800: plastic bracket; 810: through hole. DETAILED DESCRIPTION

[0066] As described in the background technology, the earphones in the related art have the problem of sound leakage and poor privacy. The inventors have found that the reason for this problem is to prevent the ears and ear canals from being in a closed environment for a long time, thereby preventing the ear area from sweating or being infected by bacteria, causing ear diseases. Usually, air holes are set on the earphones; on the one hand, the air in the external environment will enter the earphones through the air holes, and affect the sound exchange effect of the electroacoustic transducer, thereby reducing the sound quality of the earphones; on the other hand, the sound in the earphones can also be transmitted to the outside space through the air holes, causing the earphones to leak sound, thereby reducing the privacy of the earphones. Therefore, the earphones in the related art cannot take into account the two major problems of ventilation and sound leakage at the same time.

[0067] In response to the above-mentioned technical problems, an embodiment of the present application provides an earphone, which provides a hollow channel connected to the first sound outlet hole on the electroacoustic transducer, and provides an end hole connected to the hollow channel on the shell. In this way, the first sound outlet hole is connected to the end hole through the hollow channel, thereby realizing the connection between the first sound outlet hole and the external environment, thereby not only providing an open listening environment for the ear, allowing the user to listen to music while monitoring external sounds, thereby meeting the different listening needs of the user, but also dissipating the heat inside the earphone to keep the ear comfortable.

[0068] In addition, by providing a first resonance cavity, a hollow channel, and an end hole to form a first Helmholtz resonance system, and by providing a second resonance cavity and a second sound outlet to form a second Helmholtz resonance system, the sound emitted from the front of the diaphragm of the electroacoustic transducer can be radiated through the end hole of the first Helmholtz resonance system, and the sound emitted from the rear of the diaphragm of the electroacoustic transducer can be radiated through the second sound outlet of the second Helmholtz resonance system. In this way, the end hole and the second sound outlet can form a dipole sound source within a preset frequency range, so that the sound in the far sound field is smaller, which prevents the sound of the earphone from leaking out, improves the privacy of the earphone, and protects the privacy of the user. In this way, the earphone provided in the embodiment of the present application can take into account the problem of air permeability and solve the problem of sound leakage from the earphone.

[0069] In addition, by providing a hollow channel in the electroacoustic transducer, the path length of the airflow or sound flowing between the first sound outlet and the end hole can be minimized, thereby effectively improving the transparency of the earphone.

[0070] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0071] Please refer to the attached Figure 1 To Attachment Figure 8 The present application provides an earphone in an embodiment, which may be an earmuff-type earphone or an on-ear earphone. In order to facilitate a detailed description of the structure of the earphone, the following embodiments are all described by taking the earmuff-type earphone as an example.

[0072] Please continue to refer to the attached Figure 1 and 2 The earphone includes a shell 100, which serves as the main body of the earphone and is used to carry various components of the earphone and facilitate the earphone cover to be placed on the user's ear so that the entire ear cover is placed in a cavity formed by the earphone and the head.

[0073] The earphone further includes an electroacoustic transducer 200 , which can convert the electrical signal output by the sound source into sound that can be heard by human ears. The electroacoustic transducer 200 is arranged in the housing 100 , that is, the housing 100 is covered on the electroacoustic transducer 200 .

[0074] The electroacoustic transducer 200 is provided with a hollow channel 210 that penetrates along its own axial direction; that is, the hollow channel penetrates two oppositely arranged wall surfaces of the electroacoustic transducer 200 along its own axis, so that the electroacoustic transducer 200 generally presents a ring structure. It should be noted that the shape of the hollow channel can be a regular shape or an irregular shape. For example, the cross section perpendicular to the axial direction of the electroacoustic transducer 200 is a longitudinal cross section, and the longitudinal cross section of the hollow channel can be circular, square or other regular shapes.

[0075] In this example, the electroacoustic transducer 200 includes a vibration system and a magnetic circuit system, wherein the vibration system includes a diaphragm, a first voice coil and a second voice coil, the diaphragm surrounds the hollow channel 210, that is, the hollow channel 210 runs through the diaphragm; the first voice coil is connected to the diaphragm and surrounds the hollow channel, the second voice coil is connected to the diaphragm and surrounds the outer periphery of the first voice coil; the magnetic circuit system is used to drive the first voice coil and the second voice coil to move so that the diaphragm vibrates and produces sound. It should be noted that the structure of the magnetic circuit system is in the prior art, and this embodiment will not be described in detail here.

[0076] Please continue to refer to the attached Figure 2 The housing 100 has a first sound outlet 110, and the first sound outlet 110 is located on the side of the housing 100 facing the ear. The orthographic projection of the first sound outlet 110 on the electroacoustic transducer 200 at least partially overlaps with the hollow channel 210, so that the first sound outlet 110 is connected to the electroacoustic transducer 200. It can be understood that when the earphone is worn on the ear, when the diaphragm of the electroacoustic transducer 200 vibrates, the diaphragm can radiate sound to the front cavity, so that the emitted sound signal can be transmitted to the ear hole of the human ear through the first sound outlet 110, and then enter the ear canal.

[0077] The housing 100 also has an end hole 120, which is located on the side of the housing 100 away from the ear. In order to facilitate a detailed description of the positions of the first sound outlet hole 110 and the end hole 120, the wall surface of the housing 100 close to the ear is referred to as the inner wall, and the wall surface of the housing 100 away from the ear and opposite to the inner wall surface is referred to as the outer wall 160. Among them, the first sound outlet hole 110 is arranged on the inner wall of the housing 100, which penetrates the inner wall of the housing 100 and is connected to the hollow channel 210 of the electroacoustic transducer 200. The end hole 120 is arranged on the outer wall 160 of the housing 100 and penetrates the outer wall 160 of the housing 100 to achieve communication between the end hole 120 and the external environment.

[0078] It should be understood that in order to allow the gas in the chamber formed by the shell 100 and the ear to diffuse into the external environment, so as to dissipate the heat inside the earphone and keep the ear comfortable, the end hole 120 needs to be connected with the hollow channel 210, thereby achieving the sequential connection between the first sound hole 110, the hollow channel 210 and the end hole 120.

[0079] The connection between the hollow channel 210 and the end hole 120 can be understood as direct connection or indirect connection. In one example, the connection between the hollow channel 210 and the end hole 120 is direct connection, that is, at least the portion of the housing 100 where the end hole 120 is provided is arranged in close contact with the electroacoustic transducer 200, so that the end hole 120 is connected to the hollow channel 210. It should be noted that the area of ​​the housing 100 that is opposite to the rear tuning hole 220 of the electroacoustic transducer 200 has a certain gap with the rear tuning hole 220 to prevent the rear tuning hole 220 from being blocked. In another example, the hollow channel 210 is indirectly connected to the end hole 120. For example, a connecting channel 130 is formed in the housing 100, and the connecting channel 130 at least overlaps with the hollow channel 210 and the end hole 120, so that the connecting channel 130 connects the hollow channel 210 and the end hole 120, thereby realizing that the first sound outlet 110, the hollow channel 210 and the end hole 120 are sequentially connected in the axial direction parallel to the electroacoustic transducer 200. It can be understood that the airflow conduction between the hollow channel 210 and the end hole 120 is realized through the connecting channel 130, so the shorter the channel path between the end hole 120 and the hollow channel 210, the better, that is, the shorter the length of the connecting channel 130, the better, so as to improve the permeability of the earphone.

[0080] It should be noted that, for ease of understanding, a plane perpendicular to the axial direction of the electroacoustic transducer 20 can be taken as the first reference plane, that is, Figure 2The plane shown in is the first reference plane. The connecting channel 130 at least overlaps with the hollow channel 210. It can be understood that the size of the connecting channel 130 in the axial direction perpendicular to the electroacoustic transducer 200 is greater than or equal to the size of the hollow channel 210 in the axial direction perpendicular to the electroacoustic transducer 200, that is, the cross-sectional area of ​​the connecting channel 130 is greater than or equal to the cross-sectional area of ​​the hollow channel 210. Such a configuration can improve the airflow conduction function of the connecting channel 130, thereby effectively improving the permeability of the earphone. Accordingly, the connecting channel 130 at least overlaps with the end hole 120, which is the same as the above description, and this embodiment will not be repeated here.

[0081] In this embodiment, by setting the hollow channel 210, the end hole 120 and the connecting channel 130, the first sound hole 110 can be connected with the end hole 120 through the hollow channel 210 and the connecting channel 130, thereby realizing the connection between the first sound hole 110 and the external environment, thereby not only providing an open listening environment for the ear, allowing the user to listen to music while monitoring external sounds to meet the different listening needs of the user, but also dissipating the heat inside the earphone to keep the ear in a comfortable state.

[0082] In addition, by providing a hollow channel 210 in the electroacoustic transducer 200, the path length of the airflow or sound flowing between the first sound outlet 110 and the end hole 120 can be minimized, thereby effectively improving the transparency of the earphone.

[0083] Please continue to refer to the attached Figure 2 , a first resonance cavity 300 is formed on the side of the earphone facing the ear 10, and the first resonance cavity 300 is connected to the first sound outlet 110. When the earphone is worn, the first resonance cavity 300 covers the ear 10. It should be understood that the first resonance cavity 300 can be formed by the shell 100 itself, or other components can be formed together with the shell 100. For example, an ear pad 700 is provided on the side of the shell 100 facing the ear 10, that is, the ear pad 700 is arranged on the inner side wall of the shell 100; the ear pad 700 and the inner side wall of the shell 100 enclose the first resonance cavity 300, and the first resonance cavity 300 is connected to the inner cavity of the shell 100 through the first sound outlet 110. When the earphone is worn, the ear pad 700 fits the head, so that the ear 10 is covered by the ear pad 700. Among them, the ear pad 700 can be made of flexible material, so as to improve the wearing comfort.

[0084] Since the ear pad 700 is covered on the ear 10, the first resonance cavity 300 forms a relatively closed cavity, and the first resonance cavity 300 is connected in sequence through the first sound outlet hole 110, the hollow channel 210, the connecting channel 130 and the end hole 120, so that the above-mentioned components form a cavity structure with one end closed and the other end open, and then the first resonance cavity 300, the first sound outlet hole 110, the hollow channel 210, the connecting channel 130 and the end hole 120 form a first Helmholtz resonance system.

[0085] Please continue to refer to the attached Figure 2 A second resonance cavity 140 is also formed in the housing 100, and a second sound outlet hole 150 is provided on the side of the housing 100 away from the ear, and is spaced apart from the end hole 120. In other words, the second sound outlet hole 150 is provided on the outer side wall of the housing 100, and is distributed on the side wall of the housing 100 opposite to the first sound outlet hole 110.

[0086] The second resonance cavity 140 is connected to the rear tuning hole 220 and the second sound outlet hole 150 of the electroacoustic transducer 200. It can be understood that the rear tuning hole 220 is arranged on the electroacoustic transducer 200, one end of the rear tuning hole 220 is used to communicate with the magnetic gap of the magnetic circuit system of the electroacoustic transducer 200, and the other end of the rear tuning hole 220 is connected to the second resonance cavity 140. Among them, the second resonance cavity 140 can be roughly annular in structure, and the second resonance cavity 140 is arranged around the electroacoustic transducer 200. Such an arrangement can reduce the difficulty of selecting the setting position of the rear tuning hole 220, and facilitate the mutual communication between the rear tuning hole 220 and the second resonance cavity 140.

[0087] The rear tuning hole 220 of the electroacoustic transducer 200 is connected to the second sound outlet hole 150 through the second resonance cavity 140, so that the above-mentioned components form a cavity structure with one end closed and the other end open, thereby forming a second Helmholtz resonance system with the second resonance cavity 140 and the second sound outlet hole 150. In addition, the rear tuning hole 220 is connected to the second sound outlet hole 150 and cooperates with each other to achieve the function of tuning.

[0088] When the diaphragm of the electroacoustic transducer 200 vibrates, the diaphragm can also radiate sound to the second resonance cavity 140, so that the sound is radiated outward through the tuning hole 220, the second resonance cavity 140 and the second sound outlet hole 150 in sequence. According to the sound-generating principle of the electroacoustic transducer 200, the sound emitted from the front of the diaphragm and the sound emitted from the back of the diaphragm are opposite in phase; and in this embodiment, the sound emitted from the front of the diaphragm of the electroacoustic transducer 200 can be radiated through the end hole 120 of the first Helmholtz resonance system, and the sound emitted from the back of the diaphragm of the electroacoustic transducer 200 can be radiated through the second sound outlet hole 150 of the second Helmholtz resonance system. By adjusting the parameters of the first resonance cavity, the second resonance cavity, the first sound outlet hole, the end hole, the second sound outlet hole, the first resonance cavity and the end hole channel, the second resonance cavity and the sound outlet hole channel, etc., the sound signals emitted from the end hole 120 and the second sound outlet hole 150 are opposite in phase.

[0089] Based on the above theory, the end hole 120 and the second sound outlet 150 form a dipole sound source within a preset frequency range. By setting the dipole sound source, the sound in the far sound field can be made smaller, which prevents the sound of the earphone from leaking out, improves the privacy of the earphone, and protects the privacy of the user. In this way, the earphone provided in the embodiment of the present application can take into account the problem of ventilation and solve the problem of sound leakage of the earphone.

[0090] It should be understood that since the end hole 120 is connected to the first resonance cavity 300 through the communication channel 130, the sound emitted by the end hole 120 is called the sound emitted from the front of the diaphragm of the electroacoustic transducer 200. At the same time, the second sound outlet hole 150 is connected to the second resonance cavity 140 located behind the diaphragm of the electroacoustic transducer 200, so the sound emitted by the second sound outlet hole 150 is called the sound emitted from the rear of the diaphragm of the electroacoustic transducer 200.

[0091] In this embodiment, the shapes of the first sound hole 110, the end hole 120 and the second sound hole 150 may be circular, but are not limited to a circle, and may also include one or more of an ellipse, a racetrack, a triangle, a rectangle, a polygon or other complex shapes with decorative properties, and the present application does not make any limitation thereto.

[0092] Please continue to refer to the attached Figure 2 , the end hole 120 and the second sound outlet hole 150 are arranged at intervals. For example, the minimum spacing between the end hole 120 and the second sound outlet hole 150 in the radial direction of the electroacoustic transducer 200 is between 7 mm and 28 mm. That is, the spacing between the end hole 120 and the second sound outlet hole 150 refers to the spacing between the end hole 120 and the second sound outlet hole 150. Figure 2The minimum distance between the end hole 120 and the second sound outlet hole 150 in the radial direction of the electroacoustic transducer 200 is 8 mm, 10 mm, 15 mm, 20 mm or 28 mm.

[0093] If the minimum spacing between the end hole 120 and the second sound outlet hole 150 in the radial direction of the electroacoustic transducer 200 is less than 7 millimeters (mm), the distance between the end hole 120 and the second sound outlet hole 150 will be too small, and the sound emitted by the second sound outlet hole 150 will affect the sound emitted by the first sound outlet hole 110, especially the low-frequency sound, so that the human ear hears less low-frequency sound, affecting the sound quality; if the minimum spacing between the end hole 120 and the second sound outlet hole 150 in the radial direction of the electroacoustic transducer 200 is greater than 28 millimeters (mm), the distance between the end hole 120 and the second sound outlet hole 150 will be too large, which will in turn cause the size of the shell 100 to be too large, that is, the distance between the two similar dipole sound sources will become larger, thereby affecting the cancellation of far-field sound and reducing the effect of preventing sound leakage.

[0094] Therefore, in this embodiment, the minimum distance between the end hole 120 and the second sound outlet hole 150 in the radial direction of the electroacoustic transducer 200 is between 7 mm and 28 mm, which can ensure that the sounds emitted by the end hole 120 and the second sound outlet hole 150 are well offset in the far sound field and reduce the sound leakage of the earphone to the outside; it can also avoid increasing the size of the shell and facilitate carrying.

[0095] It should be understood that the housing 100 may be a split structure. Figure 1 The housing 100 may include a base 170 and a shell 180 . The shell 180 is covered on the base 170 and is detachably connected to the base 170 , so that an installation cavity is formed in the housing 100 .

[0096] Please continue to attach Figure 1 and attached Figure 2, the end hole 120 is arranged on the wall surface of the housing 180 away from the base 170, the first sound outlet 110 is arranged on the wall surface of the base 170 away from the housing 180, and the electroacoustic transducer 200 is arranged on the base 170 and arranged opposite to the first sound outlet 110. In this embodiment, a third annular protrusion 171 is formed on the wall surface of the base 170 facing the housing 180, and the third annular protrusion 171 surrounds the first sound outlet 110; the electroacoustic transducer 200 is arranged in the area surrounded by the third annular protrusion 171 and is fixedly connected to the third annular protrusion 171 to improve the stability of the electroacoustic transducer 200. It should be noted that when the housing 100 includes the base 170 and the housing 180, the ear pad 700 is arranged on the base 170, and the ear pad 700, the base 170, the electroacoustic transducer 200 and the head form a first resonance cavity 300.

[0097] In order to make the first Helmholtz resonance frequency f1 as large as possible and to maximize the openness of the earphone, the area of ​​the first sound hole 110 is larger than the area of ​​the electroacoustic transducer 200 in the plane direction of the diaphragm. This will result in a larger area of ​​the first sound hole 110, and the diaphragm of the electroacoustic transducer 200 may be touched by the user.

[0098] In view of this, a metal mesh, foam, mesh or plastic bracket is usually provided at the first sound outlet 110, or a combination of multiple solutions is used to protect the diaphragm; in one example, the metal mesh, foam, mesh or plastic bracket is fixedly connected to the base 170 by gluing, hot melting, ultrasound or other processes; in another example, the metal mesh, mesh is fixedly connected to the base 170 by injection molding; in another example, please refer to the attached Fig. 9 and attached Fig.10 , a plastic bracket 800 may be formed on the inner wall of the first sound outlet hole 110, and the plastic bracket 800 extends in a direction away from the electric transducer 200; or, a plastic bracket 800 may be formed on the base, and the plastic bracket 800 extends in a direction away from the electric transducer 200 and surrounds the first sound outlet hole 110. Among them, the plastic bracket 800 is provided with a through hole 810 arranged opposite to the first sound outlet hole 110, the through hole 810 is interconnected with the first sound outlet hole 110, and the diameter of the through hole 810 is smaller than the diameter of the first sound outlet hole 110. In this way, the diaphragm can be protected while ensuring the sound effect of the earphone. When the plastic bracket 800 is arranged on the base, the plastic bracket 800 can be injection molded together with the base through an injection molding process to form a complete component, which can simplify the preparation process of the earphone.

[0099] In addition, the first sound hole 110 can be divided into parts, that is, a plurality of holes are provided on the shell 100, and the plurality of holes constitute the first sound hole 110. In this way, the size of each hole is smaller than the first sound hole 110, which can prevent scratches by external devices.

[0100] In a possible implementation, in order to enable the end hole 120 and the second sound outlet hole 150 to form a dipole sound source within a preset frequency range, the present embodiment further sets various parameters of the first Helmholtz resonance system and the second Helmholtz resonance system. The first Helmholtz resonance system has a first Helmholtz resonance frequency f1, and the first Helmholtz resonance frequency f1 meets the following formula (1):

[0101]

[0102] Among them, c 0 is the speed of sound in air;

[0103] S 1 is the cross-sectional area of ​​the second channel; wherein the hollow channel, the connecting channel and the end hole together define the second channel;

[0104] V 1 is the volume of the first resonance cavity;

[0105] L 1 is the axial length of the second channel;

[0106] r 1 is the equivalent radius of the cross-sectional area of ​​the second channel.

[0107] It should be noted that the selection of the cross-sectional area of ​​the second channel 500 needs to be determined based on the numerical values ​​of the cross-sectional area of ​​the hollow channel 210, the cross-sectional area of ​​the connecting channel 130, and the cross-sectional area of ​​the end hole 120. For example, if the cross-sectional area of ​​the hollow channel 210, the cross-sectional area of ​​the connecting channel 130, and the cross-sectional area of ​​the end hole 120 are approximately equal, the cross-sectional area of ​​the second channel 500 may be the average value of the cross-sectional area of ​​the hollow channel 210, the cross-sectional area of ​​the connecting channel 130, and the cross-sectional area of ​​the end hole 120; for another example, if the difference between any two of the cross-sectional areas of the hollow channel 210, the cross-sectional area of ​​the connecting channel 130, and the cross-sectional area of ​​the end hole 120 is large, the cross-sectional area with a smaller cross-sectional area may be selected as the cross-sectional area of ​​the second channel 500; it should be understood that, as can be clearly seen from formula (1), the cross-sectional area S1 is equal to the first Helmholtz joint area S2. The resonance frequency f1 is proportional to the first Helmholtz resonance frequency f1, and in this example, the smaller cross-sectional area is selected as the cross-sectional area of ​​the second channel 500. The reason is that in actual products, the second channel 500 varies according to the product model. If the smallest cross-sectional area is used for simulation judgment, the result shows that the first Helmholtz resonance frequency f1 can meet the condition of being as large as possible and approximately equal to the second Helmholtz resonance frequency f2. Then, the cross-sectional area of ​​the second channel 500 can be adjusted according to the simulation result. For another example, when the length of the connecting channel 130 is large, the cross-sectional area of ​​the hollow channel 210 is selected as the cross-sectional area of ​​the second channel 500.

[0108] At the same time, the second Helmholtz resonance system has a second Helmholtz resonance frequency f2, and the second Helmholtz resonance frequency f2 meets the following formula (2):

[0109]

[0110] Among them, c 0 is the speed of sound in air;

[0111] S 2 is the opening area of ​​the second sound outlet;

[0112] V 2 is the volume of the second resonance cavity;

[0113] L 2 The axial length of the second sound hole

[0114] r 2 is the equivalent radius of the cross-sectional area of ​​the second sound outlet.

[0115] It can be concluded from formula (1) and formula (2) that the first Helmholtz resonance frequency f1 is related to the cross-sectional area and length of the second channel and the volume of the first resonance cavity; the second Helmholtz resonance frequency f2 is related to the opening area and length of the second sound outlet and the volume of the second resonance cavity.

[0116] In order to ensure that the sound signals radiated by the end hole 120 and the second sound outlet 150 meet the condition of a dipole sound source in a wider frequency band, the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 need to be as close to the high frequency as possible. Exemplarily, the first Helmholtz resonance frequency f1 ≥ 5000 Hz, and the second Helmholtz resonance frequency f2 ≥ 5000 Hz. For example, the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 are approximately 6000 Hz, so that the frequency response curve of the end hole 120 and the frequency response curve of the second sound outlet 150 at the resonance frequency are approximately the same, so that the two frequency response curves have similar amplitudes and opposite phases, and then the sound emitted by the end hole 120 and the second sound outlet 150 approximately meets the condition of a dipole sound source, further making the sound in the far sound field smaller, thereby preventing the sound of the earphones from leaking out and protecting the privacy of the user.

[0117] In order to make the first Helmholtz resonance frequency f1 as close to high frequency as possible, the embodiment of the present application reasonably sets the cross-sectional area and length of the second channel 500 and the volume of the first resonance cavity. Figure 2 The hollow channel 210, the connecting channel 130 and the end hole 120 together define a second channel 500, and the length of the second channel 500 is less than or equal to 43 mm. For example, the length of the second channel 500 is 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 40 mm or 43 mm. It can be understood that the length of the second channel 500 refers to the size of the second channel 500 along the axial direction of the electroacoustic transducer 200.

[0118] In order to ensure that the sound signal radiated by the end hole 120 and the second sound outlet 150 meets the condition of a dipole sound source in a wider frequency band, the resonance frequency f1 of the first Helmholtz resonance system and the resonance frequency f2 of the second Helmholtz resonance system should be as large as possible, so that f1 and f2 are as close to the high frequency as possible, therefore, the length of the second channel 500 needs to be designed to be as short as possible. In addition, the shorter second channel 500 can also improve the conductivity between the first resonance cavity 300 and the external environment, and improve the comfort of the user's ears.

[0119] The volume of the first resonant cavity 300 is less than or equal to 55 cubic centimeters (cm 3 For example, the volume of the first resonant cavity 300 is 55 cubic centimeters (cm 3 ), 53 cubic centimeters (cm 3 ), 50 cubic centimeters (cm 3 ) or 45 cubic centimeters (cm 3), it can be concluded from formula (1) that the resonance frequency f1 of the first Helmholtz resonance system is inversely proportional to the volume of the first resonance cavity 300. Therefore, the smaller the volume of the first resonance cavity 300 is, the closer the resonance frequency f1 of the first Helmholtz resonance system is to high frequency as much as possible.

[0120] The minimum cross-section of the hollow channel 210 of the electroacoustic transducer 200 needs to be large enough, wherein the minimum cross-sectional area of ​​the hollow channel 210 is not less than 5 square millimeters (mm2), further preferably, the minimum cross-sectional area of ​​the hollow channel 210 is not less than 10 square millimeters (mm2), and further preferably, the minimum cross-sectional area of ​​the hollow channel 210 is not less than 20 square millimeters (mm2).

[0121] The minimum cross-sectional area of ​​the communication channel 130 is not less than 5 square millimeters (mm2), and further preferably, the minimum cross-sectional area of ​​the communication channel 130 is not less than 10 square millimeters (mm2), and further preferably, the minimum cross-sectional area of ​​the communication channel 130 is not less than 20 square millimeters (mm2);

[0122] The minimum area of ​​the end hole 120 is not less than 15 square millimeters (mm2), further preferably, the minimum area of ​​the end hole 120 is not less than 25 square millimeters (mm2), and further preferably, the minimum area of ​​the end hole 120 is not less than 40 square millimeters (mm2).

[0123] In this embodiment, the cross-sectional areas of the hollow channel 210 , the connecting channel 130 , and the end hole 120 of the electroacoustic transducer 200 provided above can be reasonably selected and adjusted so that the first Helmholtz resonance frequency f1 is as close to the high frequency as possible.

[0124] At the same time, in order to make the second Helmholtz resonance frequency f2 as close to high frequency as possible, the embodiment of the present application reasonably limits the volume of the second resonance cavity 140 , the opening area of ​​the second sound outlet hole 150 , and the length of the second sound outlet hole 150 .

[0125] For example, the volume of the second resonant cavity 140 is 6 cubic centimeters (cm 3 ) to 55 cubic centimeters (cm 3 ), for example, the volume of the second resonant cavity 140 is 6 cubic centimeters (cm 3 ), 10 cubic centimeters (cm 3 ), 15 cubic centimeters (cm 3 ), 20 cubic centimeters (cm 3 ), 25 cubic centimeters (cm 3 ), 30 cubic centimeters (cm 3 ), 35 cubic centimeters (cm 3 ), 40 cubic centimeters (cm 3), 45 cubic centimeters (cm 3 ), 50 cubic centimeters (cm 3 ) or 55 cubic centimeters (cm 3 Preferably, the volume of the second resonant cavity 140 is 40 cubic centimeters (cm 3 ), such a setting can ensure that the second Helmholtz resonance frequency f2 is as close to the high frequency as possible, and is more convenient to adjust to be approximately the same as the first Helmholtz resonance frequency f1, so that the sound in the far sound field is smaller, which prevents the sound of the earphone from leaking out and protects the privacy of the user. It can also avoid the volume of the second resonance cavity 140 being too large, ensuring the compactness of the earphone.

[0126] The opening area of ​​the second sound outlet 150 is greater than or equal to 15 square millimeters (mm2). Along the axial direction of the electroacoustic transducer 200, the length of the second sound outlet is between 1 millimeter (mm) and 55 millimeters (mm). The opening area of ​​the second sound outlet 150 is proportional to the second Helmholtz resonance frequency f2, and the length of the second sound outlet 150 is inversely proportional to the second Helmholtz resonance frequency f2. The larger the opening area of ​​the second sound outlet 150 and the smaller the length of the second sound outlet 150, the closer the second Helmholtz resonance frequency f2 is to the high frequency as much as possible, and it is easier to adjust to be approximately the same as the first Helmholtz resonance frequency f1, so that the anti-phase sound field superposition is generated in the far field of the earphone, reducing the sound loudness and clarity, so that other people far away from the earphone cannot hear the sound emitted by the earphone clearly, thereby preventing the sound of the earphone from leaking out and protecting the privacy of the user.

[0127] According to the above parameter settings, the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 can be approximately equal, wherein |f1-f2|≤300 Hz. For example, the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 are approximately 1000 Hz.

[0128] In order to better explain why the present embodiment needs to adjust various parameters in the first Helmholtz resonance system and the second Helmholtz resonance system, a detailed explanation will be given below in conjunction with two frequency response curves.

[0129] Attached Figure 3 The frequency response curves of the sound emitted by the end hole 120 and the second sound outlet 150 before the parameters are adjusted. Figure 3It can be clearly seen that the first Helmholtz resonance frequency f1 is about 1000Hz, and the second Helmholtz resonance frequency f2 is about 2200Hz. It can be seen that within the frequency response bandwidth with f1 and f2 as the center frequency, such as the frequency response with f1 as the center frequency bandwidth of 600Hz-1600Hz (a0-a1) and the frequency response with f2 as the center frequency bandwidth of 1000Hz-4000Hz (b0-b1), the amplitudes are very different. Therefore, the frequency response curves of the end hole 120 and the second sound outlet 150 cannot meet the conditions of approximately the same amplitude and opposite phase in some frequency bands, resulting in the end hole 120 and the second sound outlet 150 being unable to form a dipole sound source within the preset frequency range.

[0130] Attached Figure 4 The frequency response curve of the sound emitted by the end hole 120 and the frequency response curve of the sound emitted by the second sound outlet 150 after the parameters are adjusted. After the adjustment, the second Helmholtz resonance frequency f2 in the frequency response curve emitted by the second sound outlet is close to 1000Hz, so that the frequency response of the frequency response bandwidth 600Hz-1600Hz (b0'-b1') with f2 as the center frequency is close in amplitude to the frequency response amplitude of the frequency response bandwidth 600Hz-1600Hz (a0-a1) with f1 as the center frequency, thereby forming a dipole sound source. Considering that the frequency response amplitudes of the frequency response bandwidths with frequencies f1 and f2 as the center frequencies are closer, the difference between f1 and f2 is limited to be smaller, that is, |f1-f2|≤300Hz.

[0131] Therefore, after adjusting various parameters in the first Helmholtz resonance system and the second Helmholtz resonance system, the first Helmholtz resonance frequency f1 and the second Helmholtz resonance frequency f2 can be made to be approximately the same; thereby making the end hole 120 and the second sound outlet hole 150 form a dipole sound source within the frequency range of 200-10000 Hz, so as to reduce the sound generated in the far field of the earphone and improve the ability of the earphone to prevent sound leakage.

[0132] As a possible implementation of the communication channel 130, please continue to refer to the attached Figure 2 The housing 100 further includes an outer wall 160, which is disposed opposite to the electroacoustic transducer 200. It should be noted that the outer wall 160 is a wall surface disposed opposite to the electroacoustic transducer 200, and the specific wall surface needs to be understood according to the shape of the electroacoustic transducer 200. For example, the shape of the electroacoustic transducer 200 is cylindrical, and the outer wall 160 can be a wall surface opposite to the bottom surface and the top surface of the electroacoustic transducer 200, or can be a wall surface opposite to the outer peripheral surface of the electroacoustic transducer 200. In order to facilitate a detailed description of the outer wall 160, the following embodiments are described by taking the outer wall 160 as a wall surface opposite to the bottom surface and the top surface of the electroacoustic transducer 200 as an example.

[0133] The end hole 120 is disposed on the outer wall 160 and penetrates the outer wall 160 along the thickness direction of the outer wall 160. The outer wall 160 is formed with a first annular protrusion 161 surrounding the end hole 120 and protruding toward the hollow passage 210, and the first annular protrusion 161 defines the communication passage 130, that is, one end of the first annular protrusion 161 away from the outer wall 160 is connected to the electroacoustic transducer 200 so that the area enclosed by the inner wall of the first annular protrusion 161 is the communication passage 130, and the remaining area of ​​the first annular protrusion 161, the electroacoustic transducer 200 and the outer wall 160 encloses the second resonance cavity 140. It should be noted that the first annular protrusion 161 can be sealed and connected to the electroacoustic transducer 200 away from the outer wall by materials such as double-sided tape, glue or a sealing ring, so that the connecting channel 130 and the hollow channel 210 of the electroacoustic transducer 200 are at least partially opposite to each other, so as to realize the connection between the end hole 120 and the hollow channel 210 through the connecting channel 130, thereby realizing the air connection between the hollow channel 210 and the external environment.

[0134] In this embodiment, the first annular protrusion 161 and the outer side wall 160 may be integrally formed or may be a separate structure. When the first annular protrusion 161 and the outer side wall 160 are integrally formed, not only can the connection strength between the outer side wall 160 and the first annular protrusion 161 be improved, thereby improving the structural strength of the housing 100; the manufacturing process of the housing 100 can also be simplified. When the first annular protrusion 161 and the outer side wall 160 are a separate structure, the position of the first annular protrusion 161 can be set according to requirements, and the space size of the connecting channel 130 and the second resonance cavity 140 can be reasonably adjusted.

[0135] In this embodiment, the connecting channel 130 is defined by the first annular protrusion 161 on the outer wall 160, so that the position and area of ​​the connecting channel can be more accurately defined, thereby achieving air flow conduction between the end hole 120 and the hollow channel 210, dissipating the heat inside the earphone, and keeping the ear in a comfortable state.

[0136] It should be understood that in order to make the resonance frequency f1 of the first Helmholtz as large as possible, the second channel 500 is as short as possible. For example, the height of the first annular protrusion is 0 millimeters (mm), that is, at least the area where the outer side wall 160 of the housing 100 is opposite to the electro-acoustic transducer 200 is arranged in close contact with the electro-acoustic transducer 200, but it should be understood that this part of the side wall cannot block the rear tuning hole 220 of the electro-acoustic transducer 200.

[0137] As another possible implementation of the communication channel 130, please refer to the attached Figure 5 The housing 100 further includes an outer side wall 160 disposed opposite to the electroacoustic transducer 200 , and the end hole 120 is disposed on the outer side wall 160 .

[0138] The earphone further includes a middle shell 400, which is disposed on the electroacoustic transducer 200 to define a middle shell channel 410 and a second resonance cavity 140 that are not connected to each other. It can be understood that the middle shell 400 is located between the electroacoustic transducer 200 and the outer wall 160, and is disposed on the electroacoustic transducer 200. As a possible example of the middle shell 400, please continue to refer to the attached Figure 5 , the middle shell 400 may be a cylindrical body with one end open, so that the electroacoustic transducer 200 may be arranged in the inner cavity of the middle shell 400. Exemplarily, the middle shell 400 includes a middle shell bottom wall 430 and an annular middle shell side wall 440, wherein the middle shell side wall 440 is arranged on the side of the middle shell bottom wall 430 facing the electroacoustic transducer 200, and encloses the middle shell channel 410 with the middle shell bottom wall 430. Among them, the end of the middle shell side wall 440 away from the middle shell bottom wall 430 may be connected to the inner side wall of the shell 100, or may be connected to the electroacoustic transducer 200. Exemplarily, the end of the middle shell side wall 440 away from the middle shell bottom wall 430 may be connected to the inner side wall of the shell 100, so that the middle shell channel 410 can be completely covered on the electroacoustic transducer 200, thereby increasing the area of ​​the middle shell channel 410.

[0139] In order to achieve communication between the middle shell channel 410 and the end hole 120, the middle shell 400 is provided with a communication hole 420 communicating with the middle shell channel 410. Exemplarily, the middle shell bottom wall 430 is provided with a communication hole 420, and the communication hole 420 penetrates the middle shell bottom wall 430 along the thickness direction of the middle shell bottom wall 430, so that one end of the communication hole 420 is communicated with the middle shell channel 410, and the other end of the communication hole 420 is communicated with the end hole 120.

[0140] The middle shell channel 410 and the connecting hole 420 define the connecting channel 130. In this example, by additionally setting the middle shell 400, and using the middle shell channel 410 and the connecting hole 420 of the middle shell 400 to define the connecting channel 130, the shape of the middle shell 400 can be adjusted according to actual needs, and then the area of ​​the connecting channel 130 can be adjusted, which is equivalent to reasonably adjusting the area of ​​the second channel in the first Helmholtz resonance system; when the sound emitted from the front of the diaphragm of the electroacoustic transducer 200 is radiated through the end hole 120 of the first Helmholtz resonance system, the standing wave frequency and the resonance frequency generated by the end hole 120 can be optimized, and then the frequency response curve of the sound signal generated by the earphone can be optimized, so that the sound in the far sound field is smaller, which prevents the sound of the earphone from leaking out, improves the privacy of the earphone, and protects the privacy of the user.

[0141] It should be noted that the middle shell channel 410 may be the entire inner cavity of the middle shell 400 or a portion of the inner cavity. Figure 5 , Attachment Figure 6 and attached Figure 7 The middle shell 400 includes a middle shell bottom wall 430 arranged opposite to the electroacoustic transducer 200. It can be understood that the middle shell bottom wall 430 is arranged opposite to the outer wall 160, wherein the middle shell bottom wall 430 and the outer wall 160 can be arranged in close contact or spaced apart. Exemplarily, the middle shell bottom wall 430 is in close contact with the outer wall 160, so that there is no gap between the middle shell bottom wall 430 and the outer wall 160. With such an arrangement, when the heat in the housing 100 is transmitted to the connecting hole 420, it can be diffused to the external environment through the end hole 120 as soon as possible, thereby shortening the length of the transmission path between the hollow channel 210 and the end hole 120, avoiding heat accumulation in the earphone, and improving the service life of each part of the earphone and the comfortable state of the user's ear.

[0142] In addition, the middle shell bottom wall 430 fits with the outer wall 160 , and the outer wall 160 can also be used to provide support for the middle shell bottom wall 430 , which can increase the contact area between the middle shell bottom wall 430 and the outer wall 160 , thereby increasing the connection strength between the middle shell 400 and the shell 100 .

[0143] The middle shell bottom wall 430 is formed with a second annular protrusion 450 surrounding the connecting hole 420 and protruding toward the hollow channel 210, and the second annular protrusion 450 defines the middle shell channel 410. In other words, the second annular protrusion 450 is equivalent to a partition, dividing the area surrounded by the middle shell bottom wall 430 and the middle shell side wall 440 into two parts, wherein the part arranged opposite to the hollow channel 210 is the middle shell channel 410, so that the middle shell channel 410 can be shortened in the direction perpendicular to the axis of the electroacoustic transducer 200, that is, the middle shell channel 410 is located at the bottom of the middle shell 430. Figure 6 The dimensions in the upper and lower directions shorten the length of the transmission path between the hollow channel 210 and the end hole 120, so that the heat in the shell 100 can be diffused to the external environment through the end hole 120 as quickly as possible. On the one hand, it can avoid heat accumulation in the earphone and increase the service life of each part of the earphone; on the other hand, it can dissipate the heat inside the earphone as quickly as possible to keep the ear in a comfortable state.

[0144] Please continue to refer to the attached Figure 6 and attached Figure 7, the end of the second annular protrusion 450 facing the electroacoustic transducer 200 is connected to the electroacoustic transducer 200. For example, the end of the second annular protrusion 450 facing the electroacoustic transducer 200 can be sealed and connected to the electroacoustic transducer 200 by materials such as double-sided tape, glue or sealing ring. Among them, the connection position of the second annular protrusion 450 and the electroacoustic transducer 200 can be close to the hollow channel 210 of the electroacoustic transducer 200, or there can be a preset distance between the second annular protrusion 450 and the hollow channel 210 of the electroacoustic transducer 200, so as to reasonably adjust the size of the middle shell channel 410 in the direction perpendicular to the axis of the electroacoustic transducer 200, thereby changing the area of ​​the middle shell channel 410. In order to make the second Helmholtz resonance frequency f2 as large as possible, the height of the second annular protrusion 450 should be low enough, for example, the height of the second annular protrusion 450 is 0 mm.

[0145] Please refer to the attached Figure 5 and attached Figure 6 When the middle shell 400 is arranged in the shell 100, a relatively closed space is formed between the middle shell 400, the electroacoustic transducer 200 and the shell. In order to realize the connection between the rear tuning hole 220 of the electroacoustic transducer 200 and the second sound outlet hole 150, a sound outlet communication hole 460 is usually arranged on the middle shell 400, and the connection between the rear tuning hole 220 and the second sound outlet hole 150 is realized through the sound outlet communication hole 460.

[0146] As for the location of the sound outlet communication hole 460 , it can be reasonably designed according to the locations of the second resonance cavity 140 and the second sound outlet hole 150 .

[0147] For an example, see the attached Figure 7 The second resonance cavity 140 is formed by a part of the inner cavity of the middle shell 400. For example, the second resonance cavity 140 is formed by the second annular protrusion 450 and the middle shell side wall 440 and the middle shell bottom wall 430 of the middle shell 400, and the second sound outlet 150 is arranged on the area where the outer wall 160 of the housing 100 is opposite to the second resonance cavity 140. Accordingly, the middle shell bottom wall 430 is provided with a sound outlet communication hole 460 communicating with the second resonance cavity 140, and the sound outlet communication hole 460 is communicated with the second sound outlet 150. It can be understood that one end of the sound outlet connecting hole 460 is connected to the rear tuning hole 220 through the second resonance cavity 140, and the other end of the sound outlet connecting hole 460 is connected to the second sound outlet hole 150, so as to ensure that the rear tuning hole 220 of the electroacoustic transducer 200 is connected to the second sound outlet hole 150 through the second resonance cavity 140 and the sound outlet connecting hole 460, so that the above-mentioned components form a cavity structure with one end closed and the other end open, thereby making the second resonance cavity 140 and the second sound outlet hole 150 form a second Helmholtz resonance system.

[0148] This embodiment can shorten the length of the transmission channel in the second Helmholtz resonance system. When the sound emitted from the rear of the diaphragm of the electroacoustic transducer 200 is radiated through the second sound outlet 150 of the second Helmholtz resonance system, the standing wave frequency and the resonance frequency generated by the second sound outlet 150 can be optimized, thereby optimizing the frequency response curve of the sound signal generated by the earphone, making the sound in the far sound field smaller, thereby preventing the sound of the earphone from leaking out, improving the privacy of the earphone, and protecting the privacy of the user.

[0149] For another example, see the attached Figure 5 and attached Figure 6 , the second resonance cavity 140 may be formed by a part of the inner cavity of the middle shell 400 and a part of the inner cavity of the shell 100. Exemplarily, a part of the outer wall of the shell 100 is arranged opposite to the electroacoustic transducer 200 in the axial direction thereof. In other words, the outer wall of the shell 100 includes a first part arranged opposite to the electroacoustic transducer 200 in the axial direction thereof and a second part connected to the first part, the second part is arranged obliquely with respect to the first part, and the angle between the second part and the first part is an obtuse angle.

[0150] At this time, when the second sound outlet hole 150 is disposed on the second portion, the sound outlet communication hole 460 is correspondingly opened on the middle shell side wall 440 , so that the sound outlet communication hole 460 connects the two portions of the second resonance cavity 140 .

[0151] When the second sound outlet hole 150 is disposed on the first portion, the sound outlet communication hole 460 is correspondingly disposed on the middle shell bottom wall 430, and the sound outlet communication hole 460 is disposed opposite to the second sound outlet hole 150 and at least partially overlaps. In this embodiment, the sound outlet communication hole 460 and the second sound outlet hole 150 share the same central axis, thereby minimizing the channel size from the middle shell channel 410 to the external environment.

[0152] In this embodiment, the cross-sectional area of ​​the region enclosed by the second annular protrusion 450 is greater than or equal to the cross-sectional area of ​​the hollow channel 210. By increasing the cross-sectional area of ​​the region enclosed by the second annular protrusion 450, the cross-sectional area of ​​the second channel 500 is increased, thereby increasing the first Helmholtz resonance frequency f1 as much as possible.

[0153] The smaller the distance between the center point of the end hole 120 and the center axis of the hollow channel 210 of the electroacoustic transducer 200, the better, so that the length of the second channel 500 can be reduced. Preferably, the distance between the center point of the end hole 120 and the center axis of the hollow channel 210 of the electroacoustic transducer 200 is 0mm-36mm, further preferably, the above distance is 0-20mm, and further preferably, the above distance is 0-5mm, so that the end hole 120 and the hollow channel 210 are at a closer distance.

[0154] In one possible implementation, please refer to the attached Figure 8 The earphone further includes an opening and closing component 600, which is disposed on the electroacoustic transducer 200 and is used to open or close the hollow channel 210. It is understandable that the opening and closing component 600 is used to open or close the hollow channel 210. It is understandable that when the opening and closing component 600 is in a closed state, the first sound outlet hole 110 and the end hole 120 are not connected. When the opening and closing component 600 is in an open state, the first sound outlet hole 110 can be connected to the end hole 120 through the hollow channel 210, thereby realizing the connection between the first sound outlet hole 110 and the external environment.

[0155] It should be noted that the opening and closing component 600 can be arranged not only on the electroacoustic transducer 200, but also at other positions. Exemplarily, the opening and closing component 600 can also be arranged on the housing 100. For example, the opening and closing component 600 can be arranged on one side of the first sound outlet hole 110, for opening or closing the first sound outlet hole 110. In this way, the connection between the first sound outlet hole 110 and the external environment can be opened or closed by opening and closing the first sound outlet hole 110. For example, the opening and closing component 600 can also be arranged on one side of the end hole 120, for opening or closing the end hole 120, so that the connection between the first sound outlet hole 110 and the external environment can be opened or closed by opening and closing the end hole 120.

[0156] In order to realize the opening and closing function of the opening and closing component 600, a linkage mechanism (not shown) is further provided on the housing 100. One end of the linkage structure is located outside the housing 100, and the other end of the linkage mechanism is connected to the opening and closing component 600, such as connected to the blades of the opening and closing component 600. The user drives the linkage mechanism to open or close the opening and closing component 600, so as to switch the earphone between the open state and the sealed state.

[0157] In other embodiments, the linkage mechanism can be connected to a motor, and the motor is used to drive the linkage mechanism to realize the opening or closing of the opening and closing component 600. For example, the motor can receive instructions from the headphone main control chip to control the opening or closing of the opening and closing component 600.

[0158] The earphones provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technicians in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A headset, characterized in that: It comprises a shell and an electroacoustic transducer, wherein the electroacoustic transducer is arranged in the shell, and the electroacoustic transducer is provided with a hollow passage penetrating along its own axial direction; The shell has a first sound outlet hole and an end hole, the first sound outlet hole is located on a side of the shell facing the ear, the first sound outlet hole is connected to the hollow channel, and the end hole is located on a side of the shell facing away from the ear and is connected to the external environment and the hollow channel respectively; A first resonance cavity is formed on a side of the earphone facing the ear, the first resonance cavity is connected to the first sound outlet hole, and when the earphone is worn, the first resonance cavity covers the ear; the first resonance cavity is connected to the end surface hole through the hollow channel, so that the first resonance cavity, the hollow channel and the end surface hole form a first Helmholtz resonance system; A second resonance cavity is also formed in the shell, and a second sound outlet hole is provided on a side of the shell away from the ear, the second resonance cavity is connected to the rear tuning hole of the electroacoustic transducer and the second sound outlet hole, and the second resonance cavity and the second sound outlet hole form a second Helmholtz resonance system; Wherein, the end surface hole and the second sound outlet hole constitute a dipole sound source within a preset frequency range.

2. The earphone according to claim 1, characterized in that The first Helmholtz resonance system has a first Helmholtz resonance frequency f1, and the second Helmholtz resonance system has a second Helmholtz resonance frequency f2; Among them, |f1-f2|≤300Hz.

3. The earphone according to claim 1, characterized in that The first Helmholtz resonance system has a first Helmholtz resonance frequency f1, and the second Helmholtz resonance system has a second Helmholtz resonance frequency f2, wherein f1≥5000 Hz and f2≥5000 Hz.

4. The earphone according to any one of claims 1 to 3, characterized in that: A communication passage is formed in the shell, and the communication passage communicates the hollow passage and the end hole.

5. The earphone according to claim 4, characterized in that: The shell also includes an outer side wall arranged opposite to the electroacoustic transducer, the end hole is arranged on the outer side wall, the outer side wall is formed with a first annular protrusion surrounding the end hole and protruding toward the hollow channel, and the first annular protrusion defines the connecting channel.

6. The earphone according to claim 4, characterized in that The shell further includes an outer side wall arranged opposite to the electroacoustic transducer, the end hole being arranged on the outer side wall, the earphone further includes a middle shell, the middle shell cover being arranged on the electroacoustic transducer to define a middle shell channel and the second resonance cavity which are not connected to each other, the middle shell channel being connected to the hollow channel, the middle shell being provided with a connecting hole connected to the middle shell channel, the connecting hole being connected to the end hole, and the middle shell channel and the connecting hole defining the connecting channel.

7. The earphone according to claim 6, characterized in that The middle shell includes a middle shell bottom wall arranged opposite to the electroacoustic transducer, the communicating hole is arranged on the middle shell bottom wall, the middle shell bottom wall is formed with a second annular protrusion surrounding the communicating hole and protruding toward the hollow channel, and the second annular protrusion defines the middle shell channel.

8. The earphone according to claim 7, characterized in that: The middle shell is provided with a sound outlet communication hole communicating with the second resonance cavity, and the sound outlet communication hole is communicated with the second sound outlet hole.

9. The earphone according to claim 8, characterized in that The sound outlet communicating hole is arranged on the bottom wall of the middle shell, and the second sound outlet hole is arranged in a region of the outer side wall opposite to the sound outlet communicating hole.

10. The earphone according to claim 7, characterized in that The bottom wall of the middle shell is in contact with the outer side wall.

11. The earphone according to any one of claims 5 to 10, characterized in that: The hollow channel, the connecting channel and the end hole together define a second channel, and the length of the second channel is less than or equal to 43 mm.

12. The earphone according to any one of claims 1 to 3, characterized in that: The volume of the first resonance cavity is less than or equal to 55 cubic centimeters.

13. The earphone according to claim 12, characterized in that The volume of the second resonance cavity is between 6 cubic centimeters and 55 cubic centimeters.

14. The earphone according to claim 11, characterized in that An opening area of ​​the second sound outlet hole is greater than or equal to 15 square millimeters.

15. The earphone according to claim 12, characterized in that: Along the axial direction of the electroacoustic transducer, the length of the second sound outlet hole is between 1 mm and 55 mm.

16. The earphone according to any one of claims 1 to 3, characterized in that: A minimum distance between the end surface hole and the second sound outlet hole in a radial direction of the electroacoustic transducer is between 7 mm and 28 mm.

17. The earphone according to any one of claims 1 to 3, characterized in that: The earphone also includes an opening and closing component, which is arranged on the electroacoustic transducer and is used to open or close the hollow channel.

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