CN115209267A

CN115209267A - Earphone set

Info

Publication number: CN115209267A
Application number: CN202110382254.4A
Authority: CN
Inventors: 张磊; 王真; 王力维; 童珮耕; 廖风云; 齐心
Original assignee: Shenzhen Voxtech Co Ltd
Current assignee: Shenzhen Voxtech Co Ltd
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2022-10-18

Abstract

The application mainly relates to an earphone, a movement shell is used for contacting with the skin of a user, an energy conversion device enables the skin contact area of the movement shell to generate bone conduction sound under the action of the energy conversion device, a vibration film divides an accommodating cavity into a front cavity and a rear cavity, the movement shell is provided with a sound outlet communicated with the rear cavity, and the vibration film generates air conduction sound transmitted to human ears through the sound outlet in the relative movement process of the energy conversion device and the movement shell; the machine core shell is provided with a pressure relief hole communicated with the front cavity and a sound adjusting hole communicated with the rear cavity, the pressure relief hole enables the front cavity to be communicated with the external environment so as to reduce the retardation of the front cavity to the rear cavity, and the sound adjusting hole can damage a high-pressure area of the rear cavity and reduce the wavelength of standing waves in the rear cavity; the pressure relief hole and the sound adjusting hole are arranged adjacently, and the effective area of the outlet end of the pressure relief hole is larger than that of the sound adjusting hole, so that the peak resonant frequency of the sound leakage output by the pressure relief hole is as close as possible to the peak resonant frequency of the sound leakage output by the sound adjusting hole, and the two sound leakage are better coherently cancelled.

Description

Earphone set

Technical Field

The application relates to the technical field of electronic equipment, in particular to an earphone.

Background

With the continuous popularization of electronic devices, electronic devices have become indispensable social and entertainment tools in people's daily life, and people have higher and higher requirements for electronic devices. Taking an electronic device such as an earphone as an example, it is demanded to have not only excellent wearing comfort but also bass dive, high-pitched sound quality, and good cruising ability.

Disclosure of Invention

The embodiment of the application provides an earphone, which comprises a core module, wherein the core module comprises a core shell, an energy conversion device and a vibrating diaphragm, the core shell is used for contacting with the skin of a user and forming an accommodating cavity, the energy conversion device is arranged in the accommodating cavity and connected with the core shell, so that a skin contact area of the core shell generates bone conduction sound under the action of the energy conversion device, the vibrating diaphragm is connected between the energy conversion device and the core shell to divide the accommodating cavity into a front cavity close to the skin contact area and a rear cavity far away from the skin contact area, the core shell is provided with a sound outlet communicated with the rear cavity, and the vibrating diaphragm generates air conduction sound transmitted to human ears through the sound outlet in the relative movement process of the energy conversion device and the core shell; the movement shell is also provided with a pressure relief hole communicated with the front cavity and a sound adjusting hole communicated with the rear cavity, the sound adjusting hole is arranged adjacent to the pressure relief hole, and the effective area of the outlet end of the sound adjusting hole is smaller than that of the outlet end of the pressure relief hole.

The beneficial effect of this application is: the application provides an earphone is through setting up the vibrating diaphragm between transducer and core casing for the earphone can export bone conduction sound and air conduction sound, can improve the acoustics performance of earphone. Furthermore, the front cavity is communicated with the external environment through the pressure relief hole, so that the retardation of the front cavity to the rear cavity is reduced, and the acoustic expressive force of the air conduction sound can be improved; through the accent sound hole with the back chamber intercommunication, can destroy the high nip of back chamber, and then reduce the wavelength of the interior standing wave of back chamber for export the peak value resonant frequency of the outside air conduction sound of earphone to the high frequency skew through the sound outlet, with the acoustics expressive force that improves the earphone. Furthermore, the pressure relief hole and the sound adjusting hole are arranged adjacently, and the effective area of the outlet end of the pressure relief hole is larger than that of the outlet end of the sound adjusting hole, so that the peak resonant frequency of sound leakage output to the outside of the earphone through the pressure relief hole is as close as possible to the peak resonant frequency of sound leakage output to the outside of the earphone through the sound adjusting hole, the sound leakage output to the outside of the earphone through the pressure relief hole and the sound adjusting hole is coherent and cancelled better, and the sound leakage problem of the earphone is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a headset provided in the present application;

fig. 2 is a schematic cross-sectional view of an embodiment of a movement module provided in the present application;

fig. 3 is a schematic diagram comparing frequency response curves before and after a diaphragm is arranged in the earphone provided by the present application;

fig. 4 is a schematic cross-sectional view of an embodiment of a cartridge housing provided herein;

FIG. 5 is a cross-sectional schematic view of an embodiment of a transducer apparatus provided herein;

FIG. 6 is a schematic view of a partial cross-sectional structure of various embodiments of a diaphragm provided herein;

FIG. 7 is a schematic view of a partial cross-sectional structure of a diaphragm provided herein;

FIG. 8 is a schematic structural diagram of various embodiments of sound directing components provided herein;

fig. 9 is a schematic top view of an embodiment of an acoustic resistance network provided in the present application;

FIG. 10 is a graphical representation of the frequency response of the air conduction at the sound guide of an embodiment of the earphone provided by the present application;

FIG. 11 is a graphical representation of the frequency response of an air conduction sound at the sound guide of an embodiment of the earphone as provided herein;

FIG. 12 is a graphical representation of the frequency response of the air conduction at the pressure relief vent of an embodiment of the earphone of the present application;

fig. 13 is a schematic view showing a comparison of sound pressure distribution of the front and rear cavities of the movement module provided with the tone tuning holes;

FIG. 14 is a graphical representation of the frequency response of the air conduction at the sound guide of an embodiment of the earphone provided by the present application;

FIG. 15 is a graphical representation of the frequency response of the air conduction at the sound guide of an embodiment of the earphone provided by the present application;

fig. 16 is a schematic diagram of a frequency response curve of a leakage sound of the movement module provided by the present application;

fig. 17 is a schematic structural diagram of an embodiment of a movement module provided in the present application;

fig. 18 is a schematic structural diagram of an embodiment of a movement module provided in the present application;

fig. 19 is a schematic diagram comparing frequency response curves of air conduction sound at front and rear pressure release holes of a communication hole of a movement module provided by the present application;

FIG. 20 is a schematic structural diagram of one embodiment of a coil support provided herein;

fig. 21 is a schematic structural diagram of various embodiments of a movement module provided by the present application;

FIG. 22 is a graphical representation of the frequency response of the air conduction at the sound guide of an embodiment of the earphone as provided herein;

fig. 23 is a schematic diagram of a frequency response curve of a leakage sound of the movement module provided by the present application;

FIG. 24 is a graphical representation of the frequency response of the air conduction at the sound guide of an embodiment of the earphone as provided herein;

figure 25 is a schematic structural view of various embodiments of a cartridge module provided herein;

FIG. 26 is a graphical representation of the frequency response of the air conduction at the sound guide of an embodiment of the earphone provided by the present application;

FIG. 27 is a graphical representation of the frequency response of the air conduction at the sound guide of an embodiment of the earphone as provided herein;

fig. 28 is a schematic structural diagram of an embodiment of a headset provided by the present application;

fig. 29 is a schematic structural diagram of an embodiment of a movement module provided in the present application;

FIG. 30 is a graphical representation of the frequency response of the air conduction at the sound guide of an embodiment of the earphone as provided herein;

FIG. 31 is a schematic diagram of the principle structure of an embodiment of the headset provided by the present application;

fig. 32 is an exploded view of an embodiment of the movement module provided in the present application;

fig. 33 is an exploded view of an embodiment of the movement module according to the present disclosure.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples, not all examples, and all other examples obtained by a person of ordinary skill in the art without making any creative effort fall within the protection scope of the present application.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in an embodiment of the specification. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, the headset 100 may include two movement modules 10, two ear hook assemblies 20, and a rear hook assembly 30. Two ends of the rear hanging component 30 are respectively connected with one end of a corresponding ear hanging component 20, and the other end of each ear hanging component 20 departing from the rear hanging component 30 is respectively connected with a corresponding movement module 10. Further, the rear hanging component 30 may be disposed in a curved shape to be wound around the back side of the head of the user, and the ear hanging component 20 may also be disposed in a curved shape to be hung between the ear and the head of the user, so as to facilitate the wearing requirement of the earphone 100; and the movement module 10 is used for converting the electrical signal into mechanical vibration so that the user can hear the sound through the earphone 100. Thus, when the earphone 100 is in a wearing state, the two movement modules 10 are respectively located on the left side and the right side of the head of the user, the two movement modules 10 also press and hold the head of the user under the matching action of the two ear-hang assemblies 20 and the rear-hang assembly 30, and the user can also hear the sound output by the earphone 100.

It should be noted that: the headset 100 may also be worn in other ways, such as: the ear hook assembly 20 covers or wraps around the user's ear and the rear hook assembly 30 straddles the top of the user's head, not to mention.

In conjunction with fig. 1, the headset 100 may further include a main control circuit board 40 and a battery 50. The main control circuit board 40 and the battery 50 may be disposed in the same accommodating compartment of the ear hook assembly 20, or disposed in the accommodating compartments of the two ear hook assemblies 20 respectively. Further, the main control circuit board 40 and the battery 50 may be electrically connected to the two movement modules 10 through corresponding wires, the former may be used to control the movement modules 10 to convert the electrical signals into mechanical vibrations, and the latter may be used to provide the electric energy to the earphone 100. Of course, the earphone 100 described herein may also include microphones such as a microphone and a sound collector, and communication elements such as bluetooth and NFC, which may also be connected to the main control circuit board 40 and the battery 50 through corresponding wires to achieve corresponding functions.

It should be noted that: this application core module 10 be provided with two, two core modules 10 all can change the core vibration into with the signal of telecommunication, mainly are for the ease of earphone 100 realizes the stereo audio. Therefore, in other application scenarios where the requirement for stereo is not particularly high, such as hearing assistance of hearing patients, live prompt of a host, etc., the headset 100 may be provided with only one core module 10.

Based on the above description, the movement module 10 is used to convert the electrical signal into mechanical vibration in the power-on state, so that the user can hear the sound through the earphone 100. In general, the mechanical vibration may be applied directly to the auditory nerve of the user through bone conduction principles mainly mediated by the bone and tissue of the user, or may be applied to the eardrum of the user through air conduction principles mainly mediated by the air, thereby acting on the auditory nerve. The former may be simply referred to as "bone conduction sound" and the latter may be simply referred to as "air conduction sound" for the sound heard by the user. Based on this, the movement module 10 can form bone conduction sound, air conduction sound, bone conduction sound and air conduction sound at the same time.

With reference to fig. 2 and 1, the movement module 10 may include a movement housing 11 and a transducer device 12. Wherein, the movement housing 11 is connected with one end of the ear-hang component 20 and is used for contacting with the skin of the user. Furthermore, the movement housing 11 also forms an accommodating cavity (not labeled in the figure), and the transducer 12 is disposed in the accommodating cavity and connected to the movement housing 11. The transducer 12 is used to convert an electrical signal into mechanical vibration in an energized state, so that a skin contact area (e.g., a front bottom plate 1161 shown in fig. 4) of the movement housing 11 can generate bone conduction sound under the action of the transducer 12. Thus, when the user wears the earphone 100, the transducer 12 converts the electrical signal into a movement vibration to drive the skin contact area to generate a mechanical vibration, and the mechanical vibration directly acts on the auditory nerve of the user through the bone and tissue of the user as media, so that the user can hear the bone conduction sound through the movement module 10.

Further, the movement module 10 may further include a diaphragm 13 connected between the transducer 12 and the movement housing 11, where the diaphragm 13 is configured to divide an inner space (i.e., the accommodating chamber) of the movement housing 11 into a front chamber 111 close to the skin contact area and a rear chamber 112 far from the skin contact area. In other words, when the user wears the headset 100, the front cavity 111 may be closer to the user than the rear cavity 112. The movement housing 11 is provided with a sound outlet 113 communicated with the rear cavity 112, and the diaphragm 13 can generate an air conduction sound transmitted to the human ear through the sound outlet 113 in the process of the relative movement between the transducer 12 and the movement housing 11. In this way, the sound generated in the rear cavity 112 can be emitted through the sound outlet 113 and then act on the eardrum of the user through the air as a medium, so that the user can hear the air conduction sound through the movement module 10.

It should be noted that: in connection with fig. 2, when the transducer means 12 moves the skin contact area towards a direction close to the user's face, this may simply be regarded as bone conduction sound enhancement. At the same time, the part of the movement housing 11 opposite to the aforementioned skin contact area is moved with it in a direction towards the face of the user, and the transducer means 12 and the diaphragm 13 connected thereto are moved in a direction away from the face of the user as a function of the force and the reaction force, so that the air in the rear chamber 112 is compressed, corresponding to an increase in the air pressure, as a result of which the sound emitted through the sound outlet openings 113 is enhanced, which can be regarded simply as an air-borne sound enhancement. Accordingly, when bone conduction is weakened, air conduction is also weakened. Based on this, bone conduction sound and air conduction sound that core module 10 produced in this application have the same characteristics of phase place. Further, since the front cavity 111 and the back cavity 112 are substantially separated by the diaphragm 13 and the transducer 12, the air pressure in the front cavity 111 changes in a manner just opposite to that in the back cavity 112. Based on this, the movement housing 11 may further be provided with a pressure relief hole 114 communicating with the front cavity 111, and the pressure relief hole 114 enables the front cavity 111 to communicate with the external environment, that is, air can freely enter and exit the front cavity 111. In this way, the change of the air pressure in the rear cavity 112 can be prevented as much as possible by the front cavity 111, which can effectively improve the acoustic performance of the air conduction sound generated by the movement module 10. The pressure relief hole 114 and the sound outlet hole 113 are staggered with each other, that is, they are not adjacent to each other, so as to avoid the noise reduction phenomenon caused by the opposite phase of the two as much as possible.

As an example, the actual area of the outlet end of the sound outlet hole 113 may be greater than or equal to 8mm ² So that the user hears more air conduction sound. Wherein, the actual area of the inlet end of the sound outlet hole 113 may also be larger than or equal to the actual area of the outlet end thereof.

It should be noted that: because the core housing 11 and other structural members have a certain thickness, the through holes formed in the core housing 11, such as the sound outlet 113 and the pressure relief hole 114, have a certain depth, and further, for the accommodating cavity, the through holes have an inlet end close to the accommodating cavity and an outlet end far away from the accommodating cavity. Further, the actual area of the outlet end described herein may be defined as the area of the end surface where the outlet end is located.

In this way, because the air conduction sound and the bone conduction sound generated by the movement module 10 are in the same vibration source (i.e. the transducer 12), and the phases of the two are also the same, the sound heard by the user through the earphone 100 can be stronger, the earphone 100 can also save more power, and the cruising ability of the earphone 100 can be further prolonged. In addition, through the structure of rationally designing core module 10, can also make air conduction sound and bone conduction sound mutually support on the frequency channel of frequency response curve to make earphone 100 can have excellent acoustics performance in specific frequency channel. For example, the low frequency band of the bone conduction sound is compensated by the air conduction sound, and the middle frequency band of the bone conduction sound are strengthened by the air conduction sound.

It should be noted that: in the present application, the frequency range corresponding to the low frequency band may be 20 to 150Hz, the frequency range corresponding to the middle frequency band may be 150 to 5kHz, and the frequency range corresponding to the high frequency band may be 5k to 20kHz. Wherein, the frequency range corresponding to the middle-low frequency band can be 150-500Hz, and the frequency range corresponding to the middle-high frequency band can be 500-5kHz.

Based on the above detailed description, in conjunction with fig. 3, the skin contact area is capable of generating bone conduction sound under the influence of the transducer means 12, which bone conduction sound accordingly has a frequency response curve. Wherein the frequency response curve may have at least one resonance peak. Further, the peak resonant frequency of the aforementioned resonant peak may satisfy the relation: the | f1-f2|/f1 is less than or equal to 50 percent. In addition, the difference between the peak resonant intensity corresponding to f1 and the peak resonant intensity corresponding to f2 may be less than or equal to 5db. Wherein, f1 is the peak value resonance frequency of the aforementioned resonance peak when the diaphragm 13 is connected with the transducer device 12 and the movement housing 11, and f2 is the peak value resonance frequency of the aforementioned resonance peak when the diaphragm 13 is disconnected with any one of the transducer device 12 and the movement housing 11. In other words, | f1-f2|/f1 can be used to measure the influence of the diaphragm 13 on the skin contact area driven by the transducer 12; wherein a smaller ratio indicates a smaller influence. Thus, on the basis of not influencing the original resonance system of the movement module 10 as much as possible, the vibration diaphragm 13 is introduced to enable the movement module 10 to synchronously output bone conduction sound and air conduction sound with the same phase, so that the acoustic performance of the movement module 10 is improved, and electricity is saved.

For example, referring to fig. 3, the present embodiment may mainly consider the offset of the low frequency band or the middle and low frequency band in the frequency response curve, that is, f1 is less than or equal to 500Hz, so that the low frequency and the middle and low frequency of the bone conduction sound are not affected as much as possible. The offset may be less than or equal to 50Hz, i.e., | f1-f2| ≦ 50Hz, so that the diaphragm 13 may not affect the skin contact area driven by the transducer 12 as much as possible. Further, the offset may be greater than or equal to 5Hz, that is, | f1-f2| ≧ 5Hz, so that the diaphragm 13 has certain structural strength and elasticity, fatigue deformation in the use process is reduced, and the service life of the diaphragm 13 is further prolonged.

It should be noted that: in connection with fig. 3, this embodiment may define that the skin contact area has a first frequency response curve (for example, indicated by k1+ k2 in fig. 3) when the diaphragm 13 is connected to the transducer device 12 and the movement housing 11, and the skin contact area has a second frequency response curve (for example, indicated by k1 in fig. 3) when the diaphragm 13 is disconnected from any one of the transducer device 12 and the movement housing 11. Further, for the frequency response curves described herein, the horizontal axis may represent frequency in Hz; the vertical axis may represent intensity, which is in dB.

Referring to fig. 4 and 2, the movement case 11 may include a rear case 115 and a front case 116 connected to the rear case 115. The rear housing 115 and the front housing 116 may be fastened and joined together to form a receiving cavity for receiving structural members such as the transducer 12 and the diaphragm 13. Further, the front case 116 is adapted to contact the skin of the user to form a skin contact area of the movement case 11, that is, when the movement case 11 contacts the skin of the user, the front case 116 is closer to the user than the rear case 115. In this regard, the transducer device 12 may be coupled to the front housing 116 such that the transducer device 12 causes mechanical vibration to be imparted to the skin contact area of the cartridge housing 11. Further, the sound outlet hole 113 may be provided in the rear case 115, and the pressure relief hole 114 may be provided in the front case 116. The diaphragm 13 may be connected to the rear housing 115, or may be connected to the front housing 116, or may be connected to a joint between the rear housing 115 and the front housing 116.

Illustratively, the rear case 115 may include a rear bottom plate 1151 and a rear barrel-shaped side plate 1152 that are integrally connected, and an end of the rear barrel-shaped side plate 1152 facing away from the rear bottom plate 1151 is connected to the front case 116. The sound outlet 113 may be provided in the rear cylindrical side plate 1152.

Further, the inner side surface of the movement housing 11 may be provided with an annular platform 1153, for example, the annular platform 1153 is provided at an end of the rear cylindrical side plate 1152 facing away from the rear bottom plate 1151. With reference to fig. 4, the rear base plate 1151 may be used as a reference, and the annular platform 1153 may be slightly lower than the end surface of the rear cylindrical side plate 1152 facing away from the rear base plate 1151. Referring to fig. 2, the sound outlet 113 may be located between the annular platform 1153 and the rear base plate 1151 in the vibration direction of the transducer device 12. Based on this, the cross-sectional area of the sound outlet hole 113 may be gradually decreased in the direction from the inlet end to the outlet end of the sound outlet hole 113 (i.e., the direction of the sound outlet hole 113 toward the sound outlet channel 141 mentioned later) so that the annular platform 1153 has a sufficient thickness in the vibration direction of the transducer device 12, thereby increasing the structural strength of the annular platform 1153. In this way, when the rear case 115 is engaged with the front case 116, the front case 116 can press and fix the coil holder 121, which will be described later, to the annular receiving base 1153. Further, the diaphragm 13 may be fixed to the annular platform 1153, or may be pressed against the annular platform 1153 by the coil support 121, and is further connected to the movement housing 11.

Illustratively, the front housing 116 may include a front bottom plate 1161 and a front cylindrical side plate 1162 integrally connected, and an end of the front cylindrical side plate 1162 facing away from the front bottom plate 1161 is connected to the rear housing 115. Wherein the area of front substrate 1161 may be simply considered the skin contact area as described herein. Accordingly, a pressure relief hole 114 may be provided in the front barrel side plate 1162.

Referring to fig. 5 and 2, the transducer 12 may include a coil support 121, a magnetic circuit 122, a coil 123, and a spring plate 124. Wherein the coil support 121 and the spring plate 124 are disposed within the front cavity 111. A central region of the spring plate 124 may be connected to the magnetic circuit system 122, and a peripheral region of the spring plate 124 may be connected to the movement case 11 through the coil support 121 to suspend the magnetic circuit system 122 within the movement case 11. Further, the coil 123 may be connected to the coil support 121 and extend into the magnetic gap of the magnetic circuit 122.

As an example, the coil holder 121 may include an annular main body portion 1211 and a first cylindrical holder portion 1212, and one end of the first cylindrical holder portion 1212 is connected to the annular main body portion 1211. The annular body 1211 may be connected to a peripheral region of the spring plate 124, and may be formed as an integral structure by a metal insert molding process. At this time, the annular body 1211 may be connected to the front bottom plate 1161 by one or a combination of bonding, clamping, and the like. Further, the coil 123 is connected to the other end of the first cylindrical holder portion 1222 facing away from the annular body portion 1211, so that the coil protrudes into the magnetic circuit system 122. At this time, a portion of the diaphragm 13 may be connected to the magnetic circuit 122, and another portion may be connected to at least one of the rear case 115 and the front case 116.

Further, the coil holder 121 may further include a second cylindrical holder portion 1213 connected to the annular main body portion 1211, the second cylindrical holder portion 1213 surrounding the first cylindrical holder portion 1212 and extending in the same direction as the first cylindrical holder portion 1212 toward the side of the annular main body portion 1211. Here, the second cylindrical bracket portion 1213 and the annular main body portion 1211 may be connected together with the front case 116 to increase the connection strength between the coil bracket 121 and the movement case 11. For example: the annular main body 1211 is connected to the front bottom plate 1161, and at the same time, the second cylindrical bracket portion 1213 is connected to the second annular side plate 1152. Accordingly, the second cylindrical holder portion 1213 may be provided with an escape hole 1214 communicating with the pressure relief hole 114 to avoid the second cylindrical holder portion 1213 from obstructing the communication between the pressure relief hole 114 and the front chamber 111. At this time, a part of the diaphragm 13 may be connected to the magnetic circuit 122, and another part may be connected to the other end of the second cylindrical holder portion 1213 away from the annular main body portion 1211, and further connected to the movement case 11. Based on this, after the core mold set 10 is assembled, the other end of the second cylindrical support portion 1213, which is away from the annular main body portion 1211, can press and hold the other part of the diaphragm 13 on the annular receiving base 1153.

It should be noted that: the first cylindrical holder portion 1212 and/or the second cylindrical holder portion 1213 may be a continuous complete structure in the circumferential direction of the coil holder 121 to increase the structural strength of the coil holder 121, or may be a partially discontinuous structure to avoid other structural members.

By way of example, the magnetic circuit system 122 may include a magnetically permeable cover 1221 and a magnet 1222 that cooperate to form a magnetic field. The magnetic conductive cover 1221 may include a bottom plate 1223 and a cylindrical side plate 1224, which are integrally connected. Further, the magnet 1222 is disposed in the cylindrical side plate 1224 and fixed on the bottom plate 1223, and the side of the magnet 1222 facing away from the bottom plate 1223 may be connected to the middle region of the spring plate 124 through a connecting member 1225, and the coil 123 is extended into the magnetic gap between the magnet 1222 and the magnetic conductive cover 1221. At this time, a portion of the diaphragm 13 may be connected to the magnetically permeable cover 1221.

It should be noted that: the magnet 1222 may be a magnet group formed of a plurality of sub-magnets. In addition, a side of the magnet 1222 facing away from the bottom plate 1223 may be further provided with a magnetic conductive plate (not labeled).

Referring to fig. 6, 5 and 2, the diaphragm 13 may include a diaphragm body 131, and the diaphragm body 131 may include a first connection portion 132, a corrugated portion 133 and a second connection portion 134 which are integrally connected. Wherein the first connecting part 132 surrounds the transducer 12 and is connected with the transducer 12; the second connection portion 134 is circumferentially disposed on the periphery of the first connection portion 132, and is spaced apart from the first connection portion 132 in a direction perpendicular to the vibration direction of the transducer device 12; the corrugated portion 133 is located in a spaced area between the first connection portion 132 and the second connection portion 134, and connects the first connection portion 132 and the second connection portion 134.

As an example, the first connecting portion 132 may be provided in a cylindrical shape, and may be connected to the magnetic conductive cover 1221; the second connecting portion 134 may be provided in an annular shape, and may be connected to the other end of the second tubular bracket portion 1213 away from the annular main body portion 1211, and further connected to the movement case 11. In conjunction with fig. 5, the connection point between the corrugated portion 133 and the first connection portion 132 may be lower than the end surface of the cylindrical side plate 1224 that faces away from the bottom plate 1223.

Further, the corrugated portion 133 forms a recessed area 135 between the first connecting portion 132 and the second connecting portion 134, so that the first connecting portion 132 and the second connecting portion 134 can more easily move relative to each other in the vibration direction of the transducer 12, thereby reducing the influence of the diaphragm 13 on the transducer 12. Wherein, in connection with fig. 2, the recessed area 135 may be recessed towards the rear cavity 112. Of course, the recessed region 135 may also be recessed toward the front cavity 111, i.e., in a direction opposite to the recessed region 135 shown in FIG. 2.

It should be noted that: the number of the recessed regions 135 may be plural, for example, two or three, and are spaced in a direction perpendicular to the vibration direction of the transducer device 12; the depth of each recessed region 135 in the direction of vibration of the transducer assembly 12 may also vary. The number of the recessed regions 135 is taken as one example for the exemplary illustration in this embodiment.

As an example, the diaphragm body 131 may be made of Polycarbonate (PC), polyamide (PA), acrylonitrile Butadiene Styrene (ABS), polystyrene (Polystyrene, PS), high Impact Polystyrene (High Impact Polystyrene, HIPS), polypropylene (PP), polyethylene Terephthalate (PET), polyvinyl Chloride (PVC), polyurethane (Polyurethanes, PU), polyethylene (PE), phenol Formaldehyde (phenolic resin, PF), urea Formaldehyde (Urea Formaldehyde, melamine), melamine Formaldehyde (Melamine UF), melamine Formaldehyde (Melamine-Formaldehyde, UF), polyether ketone (PEN), polyether imide (PEN), polyethylene Naphthalate (poly ether ketone, PAR), polyethylene Naphthalate (polyether imide, poly ether ketone, or any combination thereof. Among them, PET is a thermoplastic polyester, and a diaphragm made of it is often called Mylar (Mylar) film; the PC has stronger shock resistance and stable size after being formed; PAR is an advanced version of PC, mainly for environmental considerations; PEI is softer than PET and has higher internal damping; PI is high temperature resistant, the forming temperature is higher, and the processing time is long; PEN has high strength and is hard and characterized by being capable of being painted, dyed and plated; PU is commonly used for damping layers or folding rings of composite materials, and has high elasticity and high internal damping; PEEK is a more novel material, and is friction-resistant and fatigue-resistant. It is worth noting that: the composite material can generally take into account the characteristics of multiple materials, common such as bilayer structure (general hot pressing PU increases internal resistance), three-layer structure (sandwich structure, sandwich damping layer PU, acrylic glue, UV glue, pressure sensitive adhesive), five-layer structure (two-layer film passes through the double faced adhesive tape bonding, and the double faced adhesive tape has the basic unit, usually PET).

Further, the diaphragm 13 may further include a reinforcement ring 136, and the hardness of the reinforcement ring 136 may be greater than that of the diaphragm body 131. The reinforcing ring 136 may be annular, and the width of the ring may be greater than or equal to 0.4mm, and the thickness of the ring may be less than or equal to 0.4mm. Further, the reinforcement ring 136 is connected to the second connecting portion 134, so that the second connecting portion 134 is connected to the movement case 11 through the reinforcement ring 136. Thus, the structural strength of the edge of the diaphragm 13 is increased, and the connection strength between the diaphragm 13 and the movement housing 11 is further increased.

It should be noted that: the reinforcement ring 136 is disposed in a ring shape, mainly for facilitating the adaptation to the ring structure of the second connection portion 134; the stiffening ring 136 may be a continuous, complete ring or a discontinuous, segmented ring in configuration. Further, after the core module 10 is assembled, the other end of the second cylindrical bracket portion 1213 facing away from the annular main body portion 1211 can press the reinforcement ring 136 against the annular shelf 1153.

For example, the first connecting portion 132 may be injection-molded on the outer circumferential surface of the magnetic conducting cover 1221, and the reinforcement ring 136 may also be injection-molded on the second connecting portion 134, so as to simplify the connection manner between the two and increase the connection strength between the two. The first connecting portion 132 may cover the cylindrical side plate 1224, or further cover the bottom plate 1223, so as to increase a contact area between the first connecting portion 132 and the magnetic circuit 122, and further increase a bonding strength therebetween. Similarly, the second connecting portion 134 may be connected to the inner annular surface and an end surface of the reinforcement ring 136 to increase the contact area between the second connecting portion 134 and the reinforcement ring 136, thereby increasing the bonding strength therebetween.

Referring to fig. 6, (a) to (d) in fig. 6 mainly illustrate various structural modifications of the diaphragm main body 131, and the main difference therebetween is the specific structure of the wrinkle part 133. In fig. 6 (a), the corrugated portion 133 may be disposed in a symmetrical structure, and connection points formed by two ends of the corrugated portion and the first connection portion 132 and the second connection portion 134 may also be coplanar, for example, projections of the two connection points in the vibration direction of the transducer 12 coincide. In fig. 6 (b), the corrugated portion 133 may be disposed in a symmetrical structure, but its two ends are not coplanar with the connection points formed by the first connection portion 132 and the second connection portion 134, for example, the projections of the two connection points in the vibration direction of the transducer 12 are offset from each other. For fig. 6 (c), the corrugated portion 133 may be disposed in an asymmetric structure, but both ends thereof are coplanar with the connection points formed by the first connection portion 132 and the second connection portion 134, respectively. For fig. 6 (d), the corrugated portion 133 may be disposed in an asymmetric structure, and the connection points formed by the two ends of the corrugated portion and the first connection portion 132 and the second connection portion 134 are not coplanar.

Based on the above description, for the diaphragm 13, the softer the diaphragm body 131, the more easily the diaphragm body is elastically deformed, the less the diaphragm body 131 has an influence on the transducer 12, in advance of having a certain structural strength to ensure its basic structure, fatigue resistance, and the like. Based on this, the thickness of the diaphragm body 131 may be less than or equal to 0.2mm; preferably, the thickness of the diaphragm body 131 may be less than or equal to 0.1mm. Wherein the elastic deformation of the diaphragm body 131 may mainly occur at the wrinkle part 133. Therefore, the thickness of the corrugated portion 133 may be smaller than the thickness of other portions of the diaphragm body 131. Based on this, the thickness of the wrinkle part 133 may be less than or equal to 0.2mm; preferably, the thickness of the wrinkle part 133 may be less than or equal to 0.1mm. In the embodiment, the diaphragm main body 131 is taken as an example of an equal-thickness structure for exemplary description.

Referring to FIG. 7, in the direction of vibration of the transducer 12, the recessed region 135 may have a depth H; in a direction perpendicular to the vibration direction of the transducer device 12, the recessed region 135 may have a half-depth width W1, and the first connection portion 132 and the second connection portion 134 may have a spacing distance W2 therebetween. Wherein, W1/W2 is more than or equal to 0.2 and less than or equal to 0.6, thus not only ensuring the size of the deformable area on the folded part 133, but also avoiding the structural interference between the folded part 133 and the first connecting part 132 and/or the movement shell 11. Similarly, H/W2 is greater than or equal to 0.2 and less than or equal to 1.4, so that the size of the deformable area on the folded part 133 can be ensured to be soft enough, structural interference between the folded part 133 and the first connecting part 132 and/or the movement shell 11 can be avoided, and the folded part 133 is prevented from being difficult to start oscillation due to excessive self weight.

It should be noted that: the half-depth width W1 refers to the width of the recessed region 135 at a depth of 1/2H.

Further, the corrugated portion 133 may include first, second, third, fourth, and

fifth transition sections

1331, 1332, 1333, 1334, and 1335 integrally connected. Wherein, one end of the first transition section 1331 and the second transition section 1332 may be connected with the first connection portion 132 and the second connection portion 134, respectively, and extend toward each other; one ends of the third transition section 1333 and the fourth transition section 1334 are connected to the other ends of the first transition section 1331 and the second transition section 1332, respectively, and both ends of the fifth transition section 1335 are connected to the other ends of the third transition section 1333 and the fourth transition section 1334, respectively. At this time, the aforementioned transition sections together enclose to form a recessed area 135. Wherein, in a direction from a connection point (e.g., point 7A) between the first transition section 1331 and the first connection portion 132 to a reference position point (e.g., point 7C) of the wrinkle portion 133 farthest from the first connection portion 132, an angle between a tangent line (e.g., a dotted line TL 1) of the first transition section 1331 toward the side of the recessed region 135 and the vibration direction of the transducer device 12 may gradually decrease; similarly, in a direction from a connection point (e.g., point 7B) between the second transition section 1332 and the second connection portion 134 to the aforementioned reference position point, an angle between a tangent line (e.g., the imaginary line TL 2) of the second transition section 1332 toward the side of the recessed region 135 and the vibration direction of the transducer device 12 may gradually decrease to enable the recessed region 135 to be recessed toward the rear cavity 112. Further, the angle between the tangent to the side of the third transition section 1333 facing the recessed region 135 (e.g., the dashed line TL 3) and the direction of vibration of the transducer device 12 may remain constant or gradually increase; similarly, the angle between a tangent to the side of the fourth transition section 1334 facing the recessed region 135 (e.g., the dashed line TL 4) and the direction of vibration of the transducer device 12 may remain constant or increase gradually. At this time, the fifth transition section 1335 may be provided in an arc shape.

As an example, the fifth transition section 1335 may be provided in a circular arc shape, and the circular arc radius may be greater than or equal to 0.2mm. Wherein, in conjunction with fig. 6 (a) or (b), an angle between a tangent line of the third transition section 1333 toward the side of the recessed region 135 and the vibration direction of the transducer device 12 may be zero; similarly, the tangent to the side of the fourth transition section 1334 facing the recessed region 135 may have a zero angle with the direction of vibration of the transducer device 12. At this time, the arc radius of the fifth transition section 1335 may be equal to half of the half-depth width W1 of the depression region 135. Of course, in conjunction with fig. 6 (c) or (d), the tangent to the side of the third transition section 1333 facing the recessed region 135 may have a zero angle with the vibration direction of the transducer apparatus 12; and the angle between the tangent to the side of the fourth transition section 1334 facing the recessed region 135 and the direction of vibration of the transducer apparatus 12 may be a constant value greater than zero. At this point, fourth transition section 1334 may be tangent to fifth transition section 1335.

Further, the projected length of the first transition section 1331 in the direction perpendicular to the direction of vibration of the transducer device 12 may be defined as W3, the projected length of the second transition section 1332 in the aforementioned perpendicular direction may be defined as W4, and the projected length of the fifth transition section 1335 in the aforementioned perpendicular direction may be defined as W5, wherein 0.4 ≦ (W3 + W4)/W5 ≦ 2.5.

As an example, the first transition section 1331 and the second transition section 1332 may be respectively provided in a circular arc shape. The arc radius R1 of the first transition section 1331 may be greater than or equal to 0.2mm, and the arc radius R2 of the second transition section 1332 may be greater than or equal to 0.3mm, so as to avoid the bending degree of the fold portion 133 being too large, and further increase the reliability of the diaphragm 13. Of course, in other embodiments, the first transition section 1331 may include a circular arc section and a flat section connected to each other, the circular arc section being connected to the third transition section 1333, and the flat section being connected to the first connection portion 132; the second transition section 1332 may also be similar to the first transition section 1331.

Based on the above detailed description, and in conjunction with fig. 7, the thickness of the diaphragm body 131 may be 0.1mm. Wherein, W1 is optionally more than or equal to 0.9mm, and H is optionally more than or equal to 0.3mm and less than or equal to 1.0mm; optionally W3+ W4 is more than or equal to 0.3mm. Further, when the thickness of W3+ W4 is more than or equal to 0.3mm and less than or equal to 1.0mm, optionally W2 or W5 is more than or equal to 0.4mm; when the sum of W3 and W4 is less than or equal to 0.4mm and less than or equal to 0.7mm, optionally W2 or W5 is more than or equal to 0.5mm. In a specific embodiment, W2 or W5=0.4mm, W3=0.42mm, W4=0.45mm; h =0.55mm.

With reference to fig. 7 and 5, in the vibration direction of the transducer device 12, the distance from the connection point (e.g., point 7A) between the corrugated portion 133 and the first connection portion 132 to the outer end surface of the magnetic circuit system 122 away from the front cavity 111 may be defined as d1, and the distance from the central region of the spring plate 124 to the outer end surface of the magnetic circuit system 122 away from the front cavity 111 may be defined as d2, where d1/d2 is greater than or equal to 0.3 and less than or equal to 0.8. At this time, since the size of the distance d2 may be relatively determined, the size of the distance d1 may be adjusted based on the distance d2 so as to adjust a specific position where the wrinkle part 133 is connected to the first connection part 132. Further, the distance from the geometric center (e.g., point G) of the magnet 1222 to the outer end face of the magnetic circuit system 122 away from the front cavity 111 can be defined as d3, where 0.7 ≦ d1/d3 ≦ 2. At this time, since the distance d3 may be relatively determined, the distance d1 may also be adjusted based on the distance d3, so as to adjust the specific position where the wrinkle part 133 is connected to the first connection part 132. Thus, one end of the magnetic circuit 122 may be connected to the core case 11 through the spring plate 124 and the coil support 121, and the other end may be connected to the core case 11 through the diaphragm 13, that is, the spring plate 124 and the diaphragm 13 may respectively fix two ends of the magnetic circuit 122 to the core case 11 in the vibration direction of the transducer 12, so that the stability of the magnetic circuit 122 may be greatly improved.

Illustratively, d1 ≧ d3, such that in the direction of vibration of the transducer device 12, in conjunction with FIG. 2, the sound outlet 113 may be at least partially located between the aforementioned attachment point and the aforementioned outer end face. In this way, while the stability of the magnetic circuit system 122 is increased as much as possible, the volume of the rear cavity 112 may be left as large as possible to increase the acoustic performance of the movement module 10, and the position and size of the sound hole 113 on the movement housing 11 may be given as large as possible to provide a sufficient design space for flexibly disposing the sound hole 113.

Based on the above description, with reference to fig. 5, with the surface of the bottom plate 1223 facing away from the cylindrical side plate 1224 as a reference, the distance d1 may be regarded as a distance between the second connecting portion 134 and the bottom plate 1223, the distance d2 may be regarded as a distance between the spring piece 124 and the bottom plate 1223, and the distance d3 may be regarded as a distance between the geometric center of the magnet 1222 and the bottom plate 1223. In a specific embodiment, optionally d1=2.85mm, d2=4.63mm, d3=1.78mm.

Further, the distance between the projection of the connection point (e.g., point 7A) between the first connection portion 132 and the corrugated portion 133 and the projection of the connection point (e.g., point 7B) between the second connection portion 134 and the corrugated portion 133 in the vibration direction of the transducer 12, respectively, may be defined as d4, where 0 ≦ d4/W2 ≦ 1.8. At this time, a specific position where the wrinkle part 133 is connected to the first connection part 132 may also be adjusted. With reference to (a) or (c) in fig. 6, the projection of the connection point between the first connection portion 132 and the folded portion 133 and the projection of the connection point between the second connection portion 134 and the folded portion 133 in the vibration direction of the transducer 12 may coincide, that is, d4=0. Of course, in conjunction with fig. 6 (B) or (d), the connection point (e.g., point 7A) between the first connection portion 132 and the corrugated portion 133 and the connection point (e.g., point 7B) between the second connection portion 134 and the corrugated portion 133 may be respectively offset from each other in projection in the vibration direction of the transducer device 12, that is, d4 > 0.

With reference to fig. 8 and 2, the movement module 10 may further include a sound guide member 14 connected to the movement housing 11. The sound guide member 14 is provided with a sound guide channel 141, and the sound guide channel 141 communicates with the sound outlet hole 113 and guides the air guide sound to the human ear. In other words, the sound guide 14 may be used to change the propagation path/direction of the air guide sound, and further change the directivity of the air guide sound; and can be used to shorten the distance between the sound outlet holes 113 and the human ear, thereby increasing the strength of the aforementioned air conduction sound. In addition, the sound guide member 14 can make the air-guide sound to be more deviated from the actual output position of the earphone 100 from the rear end surface of the deck case 11 opposite to the skin contact area thereof (e.g., the area where the rear bottom plate 1151 is located), so as to improve the phase-opposite cancellation of the sound at the sound outlet hole 113 by the possible sound leakage at the rear bottom plate 1151. In this way, the user can better hear the aforementioned air conduction sound when the user wears the earphone 100.

Generally, in order to ensure the sound quality, the frequency response curve should be relatively flat over a wide frequency band, that is, the resonance peak needs to be located at a higher frequency as much as possible. Wherein, the frequency response curve of the air conduction sound output to the outside of the earphone 100 through the sound outlet 113 has a resonance peak, and the peak value resonance frequency of the resonance peak can be greater than or equal to 1kHz; preferably, the peak resonance frequency may be greater than or equal to 2kHz, so that the headset 100 has a good voice output effect; more preferably, the peak resonance frequency may be greater than or equal to 3.5kHz, so that the earphone 100 has a good music output effect; the peak resonant frequency may be further greater than or equal to 4.5kHz.

Based on the above description, the sound guide channel 141 communicates with the rear cavity 112 through the sound outlet hole 113, and may form a typical helmholtz resonant cavity structure. Based on the helmholtz resonant cavity model, the resonant frequency f, the volume V of the rear cavity 112, the sectional area S of the sound guiding channel 141, the equivalent radius R, and the length L thereof may satisfy the following relation: f-] ^1/2 . It is obvious that increasing the cross-sectional area of sound guiding channel 141 and/or decreasing the length of sound guiding channel 141 is advantageous to increase the resonance frequency and thus to shift the air-guide sound to as high a frequency as possible, given a certain volume of rear cavity 112.

As an example, the length of the sound guiding channel 141 may be less than or equal to 7mm. Preferably, the length of the sound guide channel 141 may be between 2mm and 5mm. In the vibration direction of the transducer 12, the distance between the outlet end of the sound guide channel 141 and the rear end face of the movement housing 11 away from the skin contact area may be greater than or equal to 3mm, so that the cancellation of the sound leakage generated by the rear end face of the movement housing 11 in phase opposition to the air conduction sound at the outlet end of the sound guide channel 141 can be avoided.

Illustratively, the cross-sectional area of sound guiding channel 141 may be greater than or equal to 4.8mm ² . Preferably, the cross-sectional area of the sound guide channel 141 may be greater than or equal to 8mm ² . Further, referring to fig. 2, the cross-sectional area of sound guide channel 141 may gradually increase along the transmission direction of the air guide (i.e. in the direction away from sound outlet 113), so that sound guide channel 141 may be configured to be trumpet-shaped; and may extend toward the front housing 116 to facilitate the channeling of the aforementioned air-borne sound. Wherein the cross-sectional area of the inlet end of the sound guiding channel 141 may be greater than or equal to 10mm ² (ii) a Alternatively, the cross-sectional area of the outlet end of sound guiding channel 141 may be greater than or equal to 15mm ² 。

As an example, the ratio between the volume of sound guiding channel 141 and the volume of rear cavity 112 may be between 0.05 and 0.9. Wherein the volume of the rear cavity 112 may be less than or equal to 400mm ³ . Preferably, the volume of the rear cavity 112 may be between 200mm ³ To 400mm ³ In between.

In one embodiment, sound guide channel 141 may be configured as a trumpet. Wherein the length of the sound guide channel 141 may be 2.5mm, and the cross-sectional areas of the inlet end and the outlet end of the sound guide channel 141 may be 15mm, respectively ² 、25.3mm ² . Further, the volume of the rear cavity 112 may be 350mm ³ 。

Referring to fig. 8, (a) to (e) in fig. 8 mainly illustrate various structural modifications of the sound guide 14, and the main difference therebetween is the specific structure of the sound guide channel 141. Among them, for (a) to (c) in fig. 8, the sound guide channel 141 can be simply regarded as a bending type arrangement; whereas for fig. 8 (d) to (e) the sound guiding channel 141 can simply be seen as a straight-through arrangement. Obviously, the above-mentioned air conduction sound has certain differences with the structural differences of the sound conduction channel 141, specifically:

in fig. 8 (a), the sound emitting direction of the sound guide channel 141 is directed to the face of the user, and the distance from the outlet end of the sound guide channel 141 to the rear end surface can be increased, thereby optimizing the directivity and intensity of the air guide sound.

For fig. 8 (b), the sound emitting direction of the sound guiding channel 141 is directed to the auricle of the user, so that the above-mentioned air-guided sound is more easily collected by the auricle into the ear canal, thereby optimizing the intensity of the above-mentioned air-guided sound.

For fig. 8 (c), the sound emitting direction of the sound guiding channel 141 is also directed to the ear canal of the user, so that the strength of the aforementioned air guiding sound can be optimized. Meanwhile, the outlet end of the sound guide channel 141 adopts an inclined outlet mode, and the inclined outlet enables the actual area of the outlet end of the sound guide channel 141 not to be limited by the cross-sectional area of the sound guide channel 141, namely, the cross-sectional area of the sound guide channel 141 is increased, so that the output of the air guide sound is facilitated.

As for (d) in fig. 8, the wall surface of the sound guide channel 141 is a plane surface, which facilitates the mold stripping during the manufacturing process.

As for (e) in fig. 8, the wall surface of the sound guide channel 141 is a curved surface, which is beneficial to realize acoustic impedance matching between the sound guide channel 141 and the atmosphere, and is further beneficial to the output of the air guide sound.

It should be noted that: the cross-sectional area of a point of sound guiding channel 141 is the smallest area that can be intercepted when sound guiding channel 141 is intercepted through the point. Further, the through-type sound guiding channel means that all of the inlet end and the outlet end of the sound guiding channel 141 can be observed from either one of the other. At this time, for the through type sound guiding channel such as shown in fig. 8 (d) to (e), the length of the sound guiding channel 141 can be calculated as follows: determining the geometric center of the inlet end of sound guiding channel 141 (e.g. point 8A) and the geometric center of its outlet end (e.g. point 8B); the geometric centers are connected to form a line segment 8A-8B whose length can be simply taken as the length of sound conduction channel 141. Accordingly, the bending type sound guide channel means that the other is not observed or only a part of the other is observed from either one of the inlet end and the outlet end of the sound guide channel 141. At this time, for example, in the bending type sound guiding channel shown in fig. 8 (a) to (c), the bending type sound guiding channel may be divided into two or more through type sub-guiding channels, and the sum of the lengths of the through type sub-guiding channels may be taken as the length of the bending type sound guiding channel. For example: in fig. 8 (a) to (C), the geometric centers (e.g., points 8C1 and 8C 2) of the planes where the middle bends are located are further determined, and the geometric centers are connected to form a line segment 8A-8C1-8B (or 8A-8C1-8C 2-8B), and the length of the line segment can be simply regarded as the length of the sound guiding channel 141.

With reference to fig. 2, the outlet end of the sound guiding channel 141 is generally covered with an acoustic resistance net 140, which can be used to adjust the acoustic resistance of the air conduction sound output to the outside of the earphone 100 through the sound outlet 113, so as to weaken the peak resonant frequency of the resonant peak of the air conduction sound in the middle-high frequency band or the high frequency band, so that the frequency response curve is smoother, and the listening effect is better; the rear cavity 112 may also be spaced from the outside to some extent so as to increase the waterproof and dustproof performance of the movement module 10. Wherein, the acoustic resistance of the acoustic resistance network 140 may be less than or equal to 260 mksaryls. Specifically, the porosity of the acoustically resistive mesh 140 can be greater than or equal to 13%; and/or, the pore size may be greater than or equal to 18 μm.

Illustratively, in conjunction with fig. 9, the acoustic resistance mesh 140 may be woven from yarn mesh threads, and factors such as the thread diameter and the density of the yarn mesh threads may affect the acoustic resistance of the acoustic resistance mesh 140. Based on the structure, every four crossed gauze wires in the gauze wires which are arranged at intervals in the longitudinal direction and the transverse direction can be surrounded to form a pore space. The area of the area surrounded by the central lines of the gauze threads can be defined as S1, and the area of the area (namely, the pore space) actually surrounded by the edges of the gauze threads can be defined as S2; the porosity can be defined as S2/S1. Further, the aperture size may be expressed as the spacing between any two adjacent screen threads, such as the length of the edge of the aperture.

Further, the effective area of a particular via or opening, as introduced herein below, may be defined as the product of its actual area and the porosity of the covered acoustically resistive mesh. For example: when the outlet end cover of the sound guide channel 141 is provided with the acoustic resistance mesh 140, the effective area of the outlet end of the sound guide channel 141 is the product of the actual area of the outlet end of the sound guide channel 141 and the porosity of the acoustic resistance mesh 140; when the outlet end of the sound guiding channel 141 is not covered with the acoustic resistance mesh 140, the effective area of the outlet end of the sound guiding channel 141 is the actual area of the outlet end of the sound guiding channel 141. Similarly, the effective areas of the outlet ends of the through holes such as the pressure relief hole and the tuning hole mentioned later can also be defined as the product of the actual area and the corresponding porosity respectively, and are not described herein again.

Based on the above description, the user mainly hears the air conduction sound output to the outside of the earphone 100 through the sound outlet 113 and the sound conduction channel 141, rather than the air conduction sound output to the outside of the earphone 100 through the pressure relief hole 114, in addition to the bone conduction sound. Therefore, the effective area of the outlet end of the sound-guiding channel 141 can be designed to be larger than that of the pressure relief hole 114.

Further, the size of the pressure relief hole 114 affects the smoothness of the air exhaust of the front cavity 111, the vibration difficulty of the diaphragm 13, and the acoustic performance of the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113. Therefore, in the case that the effective area of the outlet end of the sound guiding channel 141 is constant, for example, the actual area of the outlet end of the sound guiding channel 141 and/or the porosity of the acoustic resistance mesh 140 is constant, the effective area of the outlet end of the pressure releasing hole 114, for example, the actual area of the outlet end of the pressure releasing hole 114 and/or the acoustic resistance of the acoustic resistance mesh 1140 covering the pressure releasing hole 114, is adjusted according to the following table, so that the air conduction sound outputted to the outside of the earphone 100 through the sound outlet hole 113 can be changed. In the application, the acoustic resistance of 0 can be simply regarded as that the acoustic resistance net is not covered.

Frequency response curve	Actual area/mm ²	Acoustic resistance/MKSrayls	Porosity factor
				10-1	31.57	0	100％
10-2	2.76	0	100％
				10-3	2.76	1000	3％

Referring to fig. 10, as the actual area of the outlet end of the pressure relief hole 114 increases, the front cavity 111 exhausts more smoothly, and the peak resonance strength of the low frequency band or the middle and low frequency bands increases significantly; with the addition of the acoustic resistance net 1140 at the outlet end of the pressure relief hole 114, the exhaust of the front cavity 111 is affected to a certain extent, so that the middle-low frequency of the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113 is reduced, and the frequency response curve is relatively flat.

By combining the following table, the actual area of the outlet end of the pressure relief hole 114 and the acoustic resistance of the acoustic resistance net 1140 covered thereon are adjusted, so that the combination of the pressure relief hole 114 with different sizes and the acoustic resistance net 1140 with different acoustic resistances can be realized, and the frequency response curves of the air conduction sound outputted to the outside of the earphone 100 through the sound outlet 113 are substantially consistent. Where an acoustically resistive mesh 1140 having a porosity of 14% can be simply considered a single layer mesh, an acoustically resistive mesh 1140 having a porosity of 7% can be simply considered a double layer mesh.

With reference to fig. 11, the larger the actual area of the outlet end of the pressure relief hole 114 is, the larger the acoustic resistance of the corresponding acoustic resistance net is, so that the effective area of the outlet end of the pressure relief hole 114 can be substantially kept consistent, the unobstructed degree of exhaust of the front cavity 111 is substantially the same, and the frequency response curves of the air-guide sound output to the outside of the earphone 100 through the sound outlet 113 are substantially consistent. However, referring to fig. 12, although the frequency response curves of the air-guided sound outputted to the outside of the earphone 100 through the sound outlet 113 are substantially the same, the frequency response curves of the air-guided sound outputted to the outside of the earphone 100 through the pressure relief hole 114 are different, that is, the sound leakage at the pressure relief hole 114 is different. With the increase of the actual area of the outlet end of the pressure relief hole 114 and the increase of the acoustic resistance net 1140, the frequency response curve of the air conduction sound output to the outside of the earphone 100 through the pressure relief hole 114 moves down as a whole, that is, the sound leakage at the pressure relief hole 114 is reduced. In other words, while the frequency response curve of the air conduction sound at the sound guide 14 is substantially unchanged, the size of the pressure relief hole 114 can be increased as much as possible, and the acoustic resistance of the acoustic resistance net 1140 on the pressure relief hole 114 can be increased at the same time, so that the sound leakage at the pressure relief hole 114 is as small as possible. It can be seen that the effective area at the outlet end of the pressure relief vent 114 is guaranteed to be less than or equal to 2.76mm ² And the actual area of the outlet end of the pressure relief hole 114 and the porosity of the acoustic resistance net 1140 can be increased to reduce the sound leakage at the pressure relief hole 114.

It should be noted that: the single pressure relief vent 114 is unlikely to be too large due to the limited size of the cartridge housing 11. Based on this, the pressure relief holes 114 may be provided in at least one or at least two, for example three, described below.

Based on the above detailed description, the effective area of the outlet end of the sound guiding channel 141 may be larger than the effective area of the outlet end of each pressure relief hole 114, so that the user can hear the air-guide sound outputted to the outside of the earphone 100 through the sound outlet hole 113. Wherein, based on the definition of the effective area, the actual area of the outlet end of the sound guide channel 141 may be larger than the actual area of the outlet end of each pressure relief hole 114. Further, the effective area of the outlet end of sound guiding channel 141 may be greater than or equal to the total pressure relief hole114, the sum of the effective areas of the outlet ends. Wherein, the ratio of the sum of the effective areas of the outlet ends of all the pressure relief holes 114 to the effective area of the outlet end of the sound guide channel 141 may be greater than or equal to 0.15. Illustratively, the effective area of the outlet end of the full face pressure relief vent 114 may be greater than or equal to 2.5mm ² . Thus, smooth air exhaust of the front cavity 111 is ensured, so that the acoustic performance of the air conduction sound output to the outside of the earphone 100 through the sound outlet 113 is improved, and the sound leakage at the pressure relief hole 114 is reduced.

Illustratively, the actual area of the outlet end of sound guiding channel 141 may be greater than or equal to 4.8mm ² . Preferably, the actual area of the outlet end of sound guiding channel 141 may be greater than or equal to 8mm ² . Accordingly, the sum of the actual areas of the outlet ends of all of the pressure relief holes 114 may be greater than or equal to 2.6mm ² . Preferably, the actual area of the outlet end of all the pressure relief holes 114 may be greater than or equal to 10mm ² . When the number of the pressure relief holes 114 is one, the sum of the actual areas of the outlet ends of all the pressure relief holes 114 is also the actual area of the outlet end of one pressure relief hole 114; the tuning holes 117 are similar. In one embodiment, the actual area of the outlet end of sound guiding channel 141 may be 25.3mm ² (ii) a Three pressure relief holes 114 may be provided, such as a first pressure relief hole 1141, a second pressure relief hole 1142, and a third pressure relief hole 1143 mentioned later, and the actual areas of the outlet ends thereof may be 11.4mm respectively ² 、8.4mm ² 、5.8mm ² 。

Further, the outlet end of sound guide channel 141 may be covered with acoustic resistance mesh 140, and the outlet end of at least a portion of pressure relief hole 114 may be covered with acoustic resistance mesh 1140. Wherein the porosity of the acoustically resistive mesh 1140 may be less than or equal to the porosity of the acoustically resistive mesh 140. In one embodiment, the porosity of the acoustically resistive mesh 140 can be greater than or equal to 13% and the porosity of the acoustically resistive mesh 1140 can be greater than or equal to 7%.

Based on the above description, the sound guiding channel 141 communicates with the rear cavity 112 through the sound outlet hole 113, and may form a typical helmholtz resonant cavity structure and have a resonant peak. We can study the distribution of sound pressure in the back cavity 112 when the helmholtz resonant cavity structure resonates. In conjunction with fig. 13 (a), a high pressure region far from the sound outlet 113 and a low pressure region near the sound outlet 113 are formed in the rear chamber 112. Further, when the helmholtz resonant cavity structure resonates, it can be considered that a standing wave occurs in the rear cavity 112. Wherein the wavelength of the standing wave corresponds to the size of the rear cavity 112, for example, the deeper the rear cavity 112, i.e. the longer the distance between the low-pressure region and the high-pressure region, the longer the wavelength of the standing wave, resulting in a lower resonance frequency of the helmholtz resonant cavity structure. Accordingly, in conjunction with fig. 13 (b), by breaking the high pressure region, for example, by providing a through hole in the high pressure region, which is communicated with the rear cavity 112, the sound originally reflected in the high pressure region cannot be reflected, and thus the standing wave cannot be formed. At this time, when the helmholtz resonant cavity structure resonates, the high pressure region in the rear cavity 112 may move inward toward the low pressure region, so that the wavelength of the standing wave is shortened, and the resonant frequency of the helmholtz resonant cavity structure is increased.

Referring to fig. 2, the movement housing 11 may also be provided with a tuning hole 117 communicating with the rear chamber 112. Wherein, equally, the high pressure zone in the rear chamber 112 in which the tuning hole 117 is provided can most effectively destroy the high pressure zone. Of course, tuning holes 117 may be located in any region between the high pressure region and the low pressure region within rear volume 112. Illustratively, the sound adjusting hole 117 may be provided in the rear case 115, and may be disposed on both sides of the transducer device 12 opposite to the sound outlet hole 113 and the sound guide member 14 thereof.

Further, referring to fig. 14, the frequency response curve of the air conduction sound outputted to the outside of the earphone 100 through the sound outlet 113 has a resonance peak. By combining the following table, the damage degree of the tuning hole to the high-pressure area can be controlled by adjusting the actual area of the outlet end of the tuning hole 117 without covering the acoustic resistance net, so as to adjust the peak resonant frequency of the resonant peak. Here, the actual area of the outlet end of the sound-adjusting hole 117 being 0 may be regarded as the sound-adjusting hole 117 being in the closed state.

Referring to fig. 14, the larger the actual area of the outlet end of the tone tuning hole 117, the more significant the destructive effect on the high-pressure region described above, and the relatively higher the peak resonance frequency of the resonance peak. The peak resonant frequency of the resonance peak when the sound adjustment hole 117 is in the open state is shifted to a high frequency compared with the peak resonant frequency of the resonance peak when the sound adjustment hole 117 is in the closed state, and the shift amount may be greater than or equal to 500Hz. Preferably, the aforementioned offset is greater than or equal to 1kHz. Further, the peak resonance frequency of the resonance peak when the tuning hole 117 is in the open state may be greater than or equal to 2kHz, so that the earphone 100 has a good voice output effect. Preferably, the peak resonance frequency may be greater than or equal to 3.5kHz, so that the earphone 100 has a good music output effect; the peak resonant frequency may be further greater than or equal to 4.5kHz.

It should be noted that: the single tuning hole 117 cannot be too large due to the limited size of the deck housing 11. Based on this, the tone holes 117 may be provided in at least one, for example, two as described below.

Similarly, the user mainly hears the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113, rather than the air conduction sound output to the outside of the earphone 100 through the sound adjustment hole 117, in addition to the bone conduction sound. Therefore, the effective area of the outlet end of the sound guide passage 141 can be designed to be larger than that of the tuning hole 117.

With reference to fig. 14 and 13, since the tuning hole 117 is additionally provided in the rear cavity 112, a part of sound leaks from the tuning hole 117, that is, a sound leak is formed at the tuning hole 117, so that the frequency response curve of the air guide sound output to the outside of the earphone 100 through the sound outlet 113 is entirely shifted down. To this end, in conjunction with fig. 2, the outlet end of at least part of the tuning hole 117 may be covered with an acoustic resistance mesh 1170 to prevent sound from leaking out of the tuning hole 117 as much as possible while breaking the high pressure region in the rear chamber 112. In combination with the following table, adjusting the effective area of the outlet end of the tone adjusting hole 117, for example, the actual area of the outlet end of the tone adjusting hole 117 and/or the acoustic resistance of the acoustic resistance net 1170 covering the tone adjusting hole, can change the air conduction sound outputted to the outside of the earphone 100 through the sound outlet 113.

Frequency response curve	Acoustical resistance/MKSrayls
		15-1	Non-sound adjusting hole
15-2	0
		15-3	145

With reference to fig. 15, the acoustic resistance mesh 1170 is additionally arranged at the outlet end of the tuning hole 117, so that it can be ensured that there is no significant reflected sound (i.e., no standing wave, non-hard sound field boundary) at the tuning hole 117 in the rear cavity 112, and the high-pressure region in the rear cavity 112 moves inward; and can prevent sound from leaking out of the tuning hole 117 to some extent, so that sound can be output to the outside of the headphone 100 through the sound hole 113 more. Furthermore, the peak value resonance intensity of the medium and low frequency band is obviously increased, and the volume of the air conduction sound is increased; the peak value resonance intensity of the high frequency band is reduced to a certain extent, so that the frequency response curve is flatter in the high frequency band, and the high frequency tone quality is more balanced.

Based on the above detailed description, the effective area of the outlet end of the sound guiding channel 141 may be larger than the effective area of the outlet end of each of the tuning holes 117, so that the user can hear the air-guide sound outputted to the outside of the earphone 100 through the sound outlet hole 113. Wherein, based on the definition of the effective area, the output of the sound guide channel 141The actual area of the mouth end may be greater than the actual area of the exit end of each toning hole 117. Further, the effective area of the outlet end of the sound guiding channel 141 may be larger than the sum of the effective areas of the outlet ends of all the tuning holes 117. Wherein the ratio between the sum of the effective areas of the outlet ends of all the tuning holes 117 and the effective area of the outlet end of the sound guiding channel 141 may be greater than or equal to 0.08. Illustratively, the sum of the effective areas of the outlet ends of all of the tone holes 117 may be greater than or equal to 1.5mm ² . When the number of the tone holes 117 is one, the sum of the effective areas of the outlet ends of all the tone holes 117 is also the effective area of the outlet end of one tone hole 117; the pressure relief vent 114 is similar. In this way, the peak resonant frequency of the resonant peak of the air conduction sound output to the outside of the headphone 100 through the sound outlet 113 can be shifted to a high frequency as much as possible, and the sound leakage at the tuning hole 117 can be reduced.

Illustratively, the sum of the actual areas of the exit ends of all of the tuning holes 117 may be greater than or equal to 5.6mm ² . In one embodiment, two tuning holes 117 may be provided, such as a first tuning hole 1171 and a second tuning hole 1172 mentioned later, and the actual area of the outlet ends thereof may be 7.6mm each ² 、5.6mm ² 。

Further, the outlet end of the sound guide channel 141 may be covered with an acoustic resistance mesh 140, and the outlet end of at least a part of the tuning hole 117 may be covered with an acoustic resistance mesh 1170. Wherein the porosity of the acoustically resistive mesh 1170 may be less than or equal to the porosity of the acoustically resistive mesh 140. In a particular embodiment, the porosity of the acoustic resistive mesh 140 can be greater than or equal to 13% and the porosity of the acoustic resistive mesh 1170 can be less than or equal to 16%.

Based on the above description, the phases of the air conduction sound outputted to the outside of the earphone 100 through the pressure relief hole 114 and the sound outlet hole 113 are opposite, so that the pressure relief hole 114 and the sound outlet hole 113 should be staggered as much as possible in three-dimensional space to avoid the coherent cancellation of the air conduction sound outputted to the outside of the earphone 100 through the pressure relief hole 114 and the sound outlet hole 113. For this reason, the pressure relief hole 114 is as far away from the sound outlet hole 113 as possible. For the tuning holes 117 and the sound outlet holes 113, if the area of the sound outlet holes 113 can be simply regarded as a low pressure area in the rear cavity 112, the area of the rear cavity 112 furthest from the area of the sound outlet holes 113 can be simply regarded as a high pressure area in the rear cavity 112; while the tuning holes 117 may preferably be placed in the high pressure region in the rear chamber 112 to break the original high pressure region and move it towards the low pressure region. For this reason, the tuning hole 117 is as far away from the sound outlet hole 113 as possible.

Further, since the pressure relief hole 114 communicates with the front cavity 111 and the tone tuning hole 117 communicates with the rear cavity 112, so that the phases of the air conduction sounds output to the outside of the earphone 100 through the pressure relief hole 114 and the tone tuning hole 117, respectively, are opposite, it is possible to reduce the leakage sound from the pressure relief hole 114 and the tone tuning hole 117 by means of coherent cancellation. Based on this, at least part of the pressure relief holes 114 and at least part of the tone holes 117 may be arranged adjacent to each other to create conditions for coherent cancellation. In order to better cancel the sound leakage of the pressure relief hole 114 and the sound adjusting hole 117, the distance between the two should be as small as possible, for example, the minimum distance between the profiles of the outlet ends of the pressure relief hole 114 and the sound adjusting hole 117 is less than or equal to 2mm. In addition, the peak resonance frequency and/or the peak resonance intensity of the resonance peak of the air conduction sound output to the outside of the earphone 100 through the pressure relief hole 114 and the sound adjustment hole 117, respectively, should also be matched as much as possible. However, in the actual product design, it is generally difficult to control the peak resonant frequencies and/or peak resonant intensities of the resonant peaks of the two air conduction sounds to be exactly the same due to the influence of specific structure and process tolerance, so that the peak resonant frequencies and/or peak resonant intensities of the resonant peaks of the two air conduction sounds should be ensured not to be excessively different in the design as much as possible.

Referring to fig. 16, a frequency response curve of the air conduction sound outputted to the outside of the earphone 100 through the pressure release hole 114 has a first harmonic peak f1, and a frequency response curve of the air conduction sound outputted to the outside of the earphone 100 through the tuning hole 117 has a second harmonic peak f2. The following table is combined, the peak resonant frequency of the first resonant peak and the peak resonant frequency of the second resonant peak may be greater than or equal to 2kHz, and | f1-f2|/f1 is less than or equal to 60%. As the difference between the peak resonant frequency of the first resonant peak and the peak resonant frequency of the second resonant peak is gradually decreased, the wider the frequency width of the leakage sound can be reduced, i.e. the frequency response curve is relatively flat, which means that the leakage sound of the earphone 100 is reduced more and more, i.e. the effect of coherent cancellation of the air conduction sound output to the outside of the earphone 100 through the pressure relief hole 114 and the sound adjusting hole 117 is better. Preferably, the peak resonant frequency of the first resonant peak and the peak resonant frequency of the second resonant peak can be respectively greater than or equal to 3.5k, and | f1-f2| ≦ 2kHz. This is so that the air conduction sound outputted to the outside of the earphone 100 through the pressure relief hole 114 and the sound adjustment hole 117, respectively, is destructively cancelled as much as possible at high frequency.

Frequency response curve	Peak resonant frequency/Hz of f1	Peak resonant frequency/Hz of f2
			16-1	3500	5600
16-2	4500	5600
			16-3	5000	5600

Further, because structural members such as the coil support 121 and the spring piece 124 are arranged in the front cavity 111, the wavelength of the standing wave in the front cavity 111 is relatively long; the tuning holes 117 and the sound outlet holes 113 may disrupt the high-pressure region from each other so that the wavelength of the standing wave in the back cavity 112 is relatively short. As such, the peak resonant frequency of the first resonant peak is generally less than the peak resonant frequency of the second resonant peak. In order to allow better coherent cancellation of the air conduction sound output to the outside of the earphone 100 through the pressure relief hole 114 and the sound adjustment hole 117, respectively, the peak resonance frequency of the first resonance peak should be shifted as close as possible to the peak resonance frequency of the second resonance peak. For this reason, based on the helmholtz resonator model, the effective area of the outlet end of the pressure relief hole 114 and the sound-adjusting hole 117 which are adjacently disposed may be larger than the effective area of the outlet end of the sound-adjusting hole 117. Wherein, the ratio of the effective area of the outlet end of the pressure relief hole 114 to the effective area of the outlet end of the sound adjusting hole 117 in the pressure relief hole 114 and the sound adjusting hole 117 which are adjacently arranged may be less than or equal to 2. As an example, the actual area of the outlet end of the pressure relief hole 114 in the pressure relief hole 114 and the sound-adjusting hole 117 which are adjacently disposed may be larger than the actual area of the outlet end of the sound-adjusting hole 117. Further, the outlet ends of the pressure relief hole 114 and the sound adjusting hole 117 which are adjacently arranged can be respectively covered with an acoustic resistance net 1140 and an acoustic resistance net 1170, and the porosity of the acoustic resistance net 1140 can be larger than that of the acoustic resistance net 1170.

Referring to fig. 17 (a), the pressure relief hole 114 may include a first pressure relief hole 1141 and a second pressure relief hole 1142. The first pressure relief hole 1141 may be disposed far from the sound outlet 113 compared to the second pressure relief hole 1142. At this time, the effective area of the outlet end of the first pressure relief hole 1141 may be larger than that of the outlet end of the second pressure relief hole 1142. Therefore, the size of the movement shell 11 and the exhaust requirement of the front cavity 111 can be considered, and the first pressure release hole 1141 with relatively large exhaust volume can be kept away from the sound outlet 113 as far as possible, so that the influence of sound leakage at the pressure release hole 114 on air conduction at the sound outlet 113 is reduced. Further, the pressure relief holes 114 may further include a third pressure relief hole 1143, and the first pressure relief hole 1141 may be further disposed away from the sound outlet 113 than the third pressure relief hole 1143. An effective area of an outlet end of the second pressure relief hole 1142 may be larger than an effective area of an outlet end of the third pressure relief hole 1143.

Illustratively, in conjunction with fig. 17 (a) and 2, the sound outlet 113 and the first pressure relief vent 1141 may be located on opposite sides of the transducer device 12; and the second and third

pressure relief holes

1142 and 1143 may be disposed opposite to each other and may be located between the sound outlet 113 and the first pressure relief hole 1141.

Further, at least a portion of the outlet end of the pressure relief hole 114 may be covered with an acoustic resistance net 1140 so as to adjust the effective area of the outlet end of the pressure relief hole 114. In this embodiment, the outlet ends of the pressure relief holes 114 are covered with the acoustic resistance nets 1140 with the same acoustic resistance respectively for exemplary explanation. Thus, not only can the acoustic expressive force and the waterproof and dustproof performance of the earphone 100 be improved, but also the mixing of the acoustic resistance net 1140 caused by too many specification types can be avoided. Based on this, the actual area of the outlet end of the pressure relief hole 114 is adjusted to obtain the corresponding effective area. For example: the actual area of the outlet end of the first pressure relief hole 1141 may be larger than the actual area of the outlet end of the second pressure relief hole 1142, and the actual area of the outlet end of the second pressure relief hole 1142 may also be larger than the actual area of the outlet end of the third pressure relief hole 1143.

Referring to fig. 17 (b), tuning holes 117 may include a first tuning hole 1171 and a second tuning hole 1172. Wherein the first sound-adjusting hole 1171 may be disposed farther from the sound outlet hole 113 than the second sound-adjusting hole 1172. At this time, the effective area of the outlet end of the first tuning hole 1171 may be larger than the effective area of the outlet end of the second tuning hole 1172 in order to break the high pressure zone in the rear chamber 112. Thus, the size of the movement housing 11 and the requirement that the sound adjusting hole 117 damages the high-pressure area of the rear cavity 112 can be both considered, the resonance frequency of the air conduction sound at the sound outlet 113 is made as high as possible, and the first sound adjusting hole 1171 with relatively large damage degree can be made as far away from the sound outlet 113 as possible.

Illustratively, in conjunction with fig. 17 (b) and fig. 2, the sound outlet hole 113 and the first sound adjusting hole 1171 may be located on opposite sides of the transducer apparatus 12; and the second tuning hole 1172 may be located between the sound outlet hole 113 and the first tuning hole 1171.

Further, at least a portion of the outlet end cap in the tuning hole 117 may be provided with an acoustic resistance mesh 1170 to facilitate adjusting the effective area of the outlet end of the tuning hole 117. In this embodiment, the outlet ends of the tone tuning holes 117 are exemplarily illustrated by covering the acoustic resistance nets 1170 with the same acoustic resistance. Thus, not only can improveThe acoustic expressive force and the waterproof and dustproof performance of the earphone 100 can also prevent the material mixing of the acoustic resistance net 1170 due to too many specification types. Based on this, the actual area of the outlet end of the tone tuning hole 117 is adjusted to obtain the corresponding effective area. For example: the actual area of the outlet end of the first tuning hole 1171 may be greater than the actual area of the outlet end of the second tuning hole 1172. Specifically, the actual area of the outlet end of the first tuning hole 1171 may be greater than or equal to 3.8mm ² (ii) a And/or the actual area of the outlet end of the second tuning hole 1172 may be greater than or equal to 2.8mm ² 。

For example, referring to fig. 17 (c) and (d), the first pressure relief hole 1141 and the first sound-adjusting hole 1171 may be disposed adjacent to each other, and the second pressure relief hole 1142 and the second sound-adjusting hole 1172 may be disposed adjacent to each other. In this way, the air conduction sound output to the outside of the earphone 100 through the first pressure relief hole 1141 and the first sound modulation hole 1171 can be coherently cancelled, and the air conduction sound output to the outside of the earphone 100 through the second pressure relief hole 1142 and the second sound modulation hole 1172 can be coherently cancelled.

Further, the effective area of the outlet end of the first pressure relief hole 1141 may be larger than the effective area of the outlet end of the first sound modulation hole 1171, so that the peak resonant frequency of the air conduction sound output to the outside of the earphone 100 through the first pressure relief hole 1141 is shifted to a high frequency as much as possible, so as to be close to the peak resonant frequency of the air conduction sound output to the outside of the earphone 100 through the first sound modulation hole 1171 as much as possible, and further, the air conduction sound output to the outside of the earphone 100 through the first pressure relief hole 1141 and the first sound modulation hole 1171 can be better coherently cancelled. Similarly, the effective area of the outlet end of the second pressure relief hole 1142 may be larger than the effective area of the outlet end of the second sound tuning hole 1172, and the description thereof is omitted.

Similar to the sound tuning hole 117 destroying the high pressure region in the rear cavity 112, the second pressure relief hole 1142 and the third pressure relief hole 1143 destroy the high pressure region in the front cavity 111, so that the wavelength of the standing wave in the front cavity 111 is reduced, and further, the peak resonant frequency of the air conduction sound outputted to the outside of the earphone 100 through the first pressure relief hole 1141 can be shifted to a high frequency, so as to be better coherently cancelled with the air conduction sound outputted to the outside of the earphone 100 through the first sound tuning hole 1171. Wherein, the offset can be greater than or equal to 500Hz, and the peak resonance frequency of the resonance peak can be greater than or equal to 2kHz. Preferably, the offset is greater than or equal to 1kHz. Similarly, the peak resonant frequency of the air conduction sound output to the outside of the earphone 100 through the second pressure relief hole 1142 can also be shifted to a high frequency. In short, the frequency response curve of the air guide sound output to the outside of the earphone 100 through the pressure relief hole 114 disposed adjacent to the sound adjustment hole 117 has a resonance peak, and the peak resonance frequency of the resonance peak when the other pressure relief holes 114 other than the pressure relief hole 114 disposed adjacent to the sound adjustment hole 117 are in the open state is shifted to a high frequency compared to the peak resonance frequency of the resonance peak when the other pressure relief holes 114 are in the closed state. Wherein, the peak resonant frequency of the resonant peak when the other pressure relief holes 114 are in the open state may be greater than or equal to 2kHz.

Referring to fig. 17 and 2, the deck housing 11 may include first and

second sidewalls

17A and 17B on opposite sides of the transducer 12, and third and

fourth sidewalls

17C and 17D connecting the first and

second sidewalls

17A and 17B and spaced apart from each other. In short, the movement housing 11 can be simplified to a rectangular frame. Of course, the third side wall 17C and the fourth side wall 17D may also be disposed in an arc shape, so that the movement housing 11 is disposed in a track shape as a whole. The first sidewall 17A is closer to the human ear than the second sidewall 17B, and the third sidewall 17C is closer to the ear-hook assembly 20 than the fourth sidewall 17D. Further, the sound outlet hole 113 may be disposed on the first side wall 17A, so that the user can hear the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113 and the sound conduction channel 141; the first pressure relief hole 1141 and the first tuning hole 1171 can be disposed on the second side wall 17B respectively, so as to be further away from the sound outlet 113. Accordingly, the second pressure relief hole 1142 and the second tuning hole 1172 can be respectively disposed on one of the third side wall 17C and the fourth side wall 17D, and the third pressure relief hole 1143 can be disposed on the other of the third side wall 17C and the fourth side wall 17D.

Based on the above description, in conjunction with fig. 18 (a), the air in the front cavity 111 needs to bypass the coil assembly, and the path thereof can be as shown by the dotted arrow in fig. 18 (a), which results in relatively long wavelength of standing wave in the front cavity 111, and is not favorable for shifting the peak resonant frequency of the air guide sound outputted to the outside of the earphone 100 through the pressure relief hole 114 to a high frequency. For this reason, in the present embodiment, the communication hole 1215 is formed in the coil assembly, so that the air in the front cavity 111 can directly pass through the coil assembly in the process of being discharged, and in combination with fig. 18 (b), not only the efficiency of discharging the air from the front cavity 111 can be increased, but also the wavelength of the standing wave in the front cavity 111 can be reduced, and further, the peak resonant frequency of the air guide sound output to the outside of the earphone 100 through the pressure discharge hole 114 is shifted to a high frequency.

Referring to fig. 19, the frequency response curve of the air conduction sound outputted to the outside of the earphone 100 through the pressure relief hole 11 has a resonance peak, and the peak resonance frequency of the resonance peak when the communication hole 1215 is in the open state is shifted to a high frequency compared to the peak resonance frequency of the resonance peak when the communication hole 1215 is in the closed state, and the shift amount may be greater than or equal to 500HZ. Wherein a peak resonant frequency of a resonant peak when the communication hole 1215 is in an open state may be greater than or equal to 2kHz.

Illustratively, the coil assembly is disposed within the front volume 111 and extends into the magnetic gap of the magnetic circuit 122. Wherein the coil block may be provided in a ring shape and provided with a communication hole 1215 for communicating the inside and outside of the coil block. Preferably, the communication hole 1215 may be located outside the magnetic gap of the magnetic circuit 122 to shorten the path of air discharge in the front chamber 111 as much as possible.

Based on the above-mentioned description, and with reference to fig. 5, the coil assembly according to the present embodiment may include a coil holder 121 and a coil 123 connected to the coil holder 121, where the coil holder 121 is used to fix the coil 123 on the movement housing 11, and enable the coil 123 to extend into the magnetic gap of the magnetic circuit 122. Wherein the communication hole 1215 may be provided to the coil support 121. Further, the communication hole 1215 may be located on the side of the spring plate 124 facing away from the skin contact area to shorten the path for air to escape from the front chamber 111 as much as possible.

Referring to fig. 20, the communication hole 1215 may be located at a connection between the annular body portion 1211 and the first cylindrical holder portion 1212. Of course, the communication hole 1215 may be entirely located in the annular body portion 1211 or the first cylindrical holder portion 1212. Further, the number of the communication holes 1215 may be plural and be arranged along the coil groupThe rings of the pieces are arranged at intervals. Wherein a cross-sectional area of each of the communication holes 1215 may be greater than or equal to 2mm ² . Illustratively, the cross-sectional area of the communication hole 1215 provided adjacent to the first relief hole 1141 may be greater than or equal to 3mm ² The cross-sectional area of the communication hole 1215 provided adjacent to the second and

third relief holes

1142 and 1143, respectively, may be greater than or equal to 2.5mm ² 。

Based on the above-described correlation, the air vibrations in the front chamber 111 and the rear chamber 112 are in opposite phases. Based on this, the movement module 10 may further include a communication passage for communicating the front cavity 111 and the rear cavity 112, so as to destroy the high-pressure region in the front cavity 111 and the rear cavity 112, increase the peak resonant frequency of the resonant peak, and further improve the sound quality and sound leakage of the earphone 100.

As an example, referring to fig. 21 (a), the communication channel may be a micro-pore array 21A provided on the diaphragm 13, for example, the micro-pore array 21A is provided on the corrugated portion 133. Wherein at least some of the micro-holes in the micro-hole array 21A and the sound outlet holes 113 may be located at opposite sides of the transducer 12, respectively. Of course, the micro hole array 21A may be provided on both sides of the sound outlet hole 113. Further, the actual area of each microwell in microwell array 21A may be between 0.01mm ² To 0.04mm ² In the meantime.

Further, the micro hole array 21A may also cooperate with the sound adjusting hole 117 so as to shift the air conduction sound outputted to the outside of the earphone 100 through the sound outlet hole 113 to a high frequency.

Referring to fig. 22 and the following table, the frequency response curve of the air conduction sound outputted to the outside of the earphone 100 through the sound outlet 113 has a resonance peak, and the peak resonance frequency of the resonance peak may be greater than or equal to 2kHz. Wherein, the peak resonant frequency of the resonance peak when the communication channel is in the open state is shifted to a high frequency compared with the peak resonant frequency of the resonance peak when the communication channel is in the closed state, and the shift amount may be greater than or equal to 500Hz. Preferably, the offset may be greater than or equal to 1kHz. Meanwhile, referring to fig. 23, as the peak resonant frequency of the resonant peak shifts to a high frequency, the leakage sound in the middle and low frequency bands is gradually reduced.

Further, an acoustic resistance mesh 21D may be provided on the communication path defined by the communication passage. In combination with fig. 24 and the following table, by setting the acoustic resistance network 21D, the high frequency peak in the air conduction sound output to the outside of the earphone 100 through the sound outlet 113 and the sound conduction channel 141 can be further weakened, so that the frequency response curve is flatter, and the high frequency sound quality is more balanced. As an example, the porosity of the acoustically resistive mesh 21D may be less than or equal to 18%; and/or, the pore size may be less than or equal to 51 μm.

Frequency response curve	Acoustic resistance/MKSrayls	Porosity of the material
			24-1	Without communicating channels	Is composed of
24-2	0	100％
			24-3	45	18％
24-4	260	13％

As an example, in conjunction with fig. 21 (B), the communication passage may be a through hole 21B provided in the magnetic circuit system 122. Wherein the actual area of the through hole 21B may be less than or equal to 9mm ² 。

As an example, referring to fig. 21 (C), the communication passage may be a communication pipe 21C provided outside the movement case 11, the communication pipe 21C being for communicating the pressure release hole 114 and the sound adjustment hole 117. Wherein the pressure relief hole 114 and the sound adjusting hole 117 may be adjacently disposed.

Based on the above description, the front cavity 111 and the rear cavity 112 can be simply regarded as a helmholtz cavity structure, so that the air conduction sound outputted to the outside of the earphone 100 through the sound outlet 113, the pressure relief hole 114 and the sound adjusting hole 117 respectively has a resonance peak. In any of the above embodiments, the peak resonant frequency of the resonant peak is shifted to a high frequency, so as to improve the sound quality and the sound leakage of the earphone 100. Further, the peak resonance strength of the air conduction sound at the resonance peak may increase sharply, resulting in insufficient balance of sound quality. To this end, the movement module 10 may further include a helmholtz resonator 25A communicating with the front cavity 111 and/or the rear cavity 112, so as to absorb the sound energy of the front cavity 111 and/or the rear cavity 112 near the peak resonance frequency, i.e., suppress the sudden increase of the peak resonance strength, so that the frequency response curve is flatter, and the sound quality is more balanced.

As an example, referring to fig. 25 (a), a helmholtz resonator 25A may be provided in the movement housing 11, for example, opposite to a skin contact area of the movement housing 11.

As an example, referring to fig. 25 (b) to (d), the helmholtz resonator 25A may be provided in the magnetic circuit 122, for example, in the magnet 1222. The mass of the magnetic circuit 122 is larger than that of the movement housing 11, so that the amplitude of the magnetic circuit 122 is smaller under the same driving force, especially in the middle and high frequency range (for example, > 1 kHz). In other words, during the actual operation of the earphone 100, the magnetic circuit 122 vibrates significantly less than the movement case 11. Therefore, the helmholtz resonant cavity 25A is disposed on the magnetic circuit system 122, so that a wall surface with smaller vibration can be obtained, and the effect of absorbing sound energy and weakening high-frequency peaks is more remarkable.

Based on the helmholtz-chamber model, in conjunction with fig. 26, as the volume of the helmholtz resonator 25A (e.g., C in fig. 26) increases, or the area of the opening (e.g., M in fig. 26) of the helmholtz resonator 25A communicating with the front cavity 111 (or the rear cavity 112) decreases, the wider the bandwidth of the helmholtz resonator 25A attenuating the high-frequency resonance peak, the more significant the attenuation effect.

Illustratively, in connection with fig. 25 (b), a helmholtz resonator 25A may be provided in communication with the rear cavity 112. Wherein the frequency response curve of the air-guide sound outputted to the outside of the earphone 100 through the sound outlet 113 has a first resonance peak, and the helmholtz resonator 25A is configured to weaken the peak resonance strength of the first resonance peak. Wherein the peak resonant frequency of the first resonant peak may be greater than or equal to 2kHz. Further, referring to fig. 26, the difference between the peak resonance strength of the first resonance peak when the opening of the helmholtz resonator cavity 25A communicating rear cavity 112 is in the open state and the peak resonance strength of the first resonance peak when the opening of the helmholtz resonator cavity 25A communicating rear cavity 112 is in the closed state is greater than or equal to 3dB.

As an example, in connection with fig. 25 (c), a helmholtz resonance chamber 25A may be provided in communication with the front chamber 111. Wherein the frequency response curve of the air conduction sound outputted to the outside of the earphone 100 through the pressure relief hole 114 has a second resonance peak, and the helmholtz resonator 25A is configured to weaken the peak resonance strength of the second resonance peak. Wherein the peak resonant frequency of the second resonant peak may be greater than or equal to 2kHz. Further, referring to fig. 26, the difference between the peak resonance strength of the second resonance peak when the opening of the helmholtz resonator cavity 25A communicating front cavity 111 is in the open state and the peak resonance strength of the second resonance peak when the opening of the helmholtz resonator cavity 25A communicating front cavity 111 is in the closed state is greater than or equal to 3dB.

As an example, in conjunction with fig. 25 (d), a helmholtz resonance chamber 25A may be provided to communicate the front chamber 111 and the rear chamber 112 simultaneously. Wherein, the area of the opening of the communication front cavity 111 may be larger than or equal to the area of the opening of the communication rear cavity 112.

Further, the opening of the helmholtz resonator 25A communicating with the front cavity 111 (or the rear cavity 112) may also be provided with an acoustic resistance mesh 25B. With reference to fig. 27, as the acoustic resistance (for example, R in fig. 27) of the acoustic resistance network 25B increases, the frequency response curve becomes flatter and the sound quality becomes more balanced. As an example, the porosity of the acoustically resistive mesh 25B may be greater than or equal to 3%.

In connection with fig. 28, the headset 100 may include a processing circuit 28A, which processing circuit 28A may be integrated on the main control circuit board 40 and may be used to convert audio files into drive signals for the transducing device 12. The audio file may be transmitted to the processing circuit 28A in a wired/wireless manner, and the processing circuit 28A may perform signal processing such as decoding, equalization, gain adjustment, and the like on the audio file; the processed signal is further input to a speaker, which performs a conversion from an electrical signal to sound (e.g. bone conduction sound and/or air conduction sound) and outputs the sound.

Based on the above description, the front cavity 111 and the rear cavity 112 can be simply regarded as a helmholtz cavity structure, so that the air conduction sound output to the outside of the earphone 100 through the sound outlet 113, the pressure relief hole 114 and the sound adjusting hole 117 respectively has a resonance peak. In any of the above embodiments, the peak resonant frequency of the resonant peak is shifted to a high frequency, so as to improve the sound quality and the sound leakage of the earphone 100. Further, the peak resonance intensity of the air conduction sound at the resonance peak may increase sharply, resulting in an insufficient balance of sound quality. To this end, the processing circuit 28A may include at least one Equalizer (EQ), and the Equalizer may set a signal gain coefficient of a first frequency band of the audio file to be greater than a signal gain coefficient of a second frequency band, where the second frequency band is higher than the first frequency band, so as to weaken a signal amplitude of a relatively high frequency band, further reduce signal output of the frequency, weaken sudden increase of air conduction sound, and further make sound quality more balanced. Of course, the sudden increase of the bone conduction sound can also be attenuated to equalize the increase. Wherein, when the equalizer performs gain processing on the audio file, the signal gain coefficient is expressed by a positive number, and when the equalizer performs attenuation processing on the audio file, the signal gain coefficient is expressed by a negative number. Further, the equalization function of the equalizer may be implemented by a filter; the filter may be a single or a plurality of modules, and may be an analog filter or a digital filter.

Illustratively, the first frequency band may include at least 500Hz.

Illustratively, the second frequency band may include at least 3.5k or 4.5kHz.

Illustratively, the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113 has a resonance peak, and the peak resonance frequency of the resonance peak is within the second frequency band or higher than the second frequency band. Therefore, the resonance peak shifts to high frequency as much as possible, the signal amplitude of the resonance peak is weakened through the equalizer, the signal output of the second frequency is reduced, sudden increase of air conduction sound is weakened, and the high frequency of the tone quality is balanced.

As an example, the equalizer may further set a different signal gain coefficient for the first frequency band according to the volume of the headset 100. Wherein, the larger the volume is, the smaller the signal gain coefficient of the first frequency band is. For example: under the condition of small volume, the equalizer can enable the gain coefficient of a low-frequency signal to be larger, so that the hearing sense is sufficient and full in low frequency, and the tone quality is better; and under the condition of large volume, the equalizer can make the gain coefficient of the low-frequency signal smaller, thereby avoiding the sound breaking caused by the overlarge amplitude of the loudspeaker.

Referring to fig. 29, the movement housing 11 may include a main housing 29A, an auxiliary housing 29B, and an elastic connection member 29C. The main housing 29A may be used to contact the skin of a user and form a skin contact area, among other things. The transducer device 12 may be coupled to the main housing 29A, and the diaphragm 13 may be coupled between the transducer device 12 and the main housing 29A. At this time, the main housing 29A may form a front chamber 111 in cooperation with the diaphragm 13, and the sub-housing 29B may be connected to the main housing 29A by an elastic connection member 29C and may form a rear chamber 112 in cooperation with the diaphragm 13. Further, the vibration system formed by the sub-housing 29B and the elastic connection member 29C has a natural frequency f0. At this time, the sub-housing 29B may be disposed opposite to the skin contact area. The magnitude of the natural frequency can be adjusted according to parameters such as the elastic coefficient of the auxiliary housing 29B and the elastic connecting member 29C, and the like, which is not limited herein. Further, the natural frequency may be less than or equal to 2kHz. Preferably, the natural frequency may be less than or equal to 1kHz.

Illustratively, in conjunction with fig. 30, when the vibration frequency of the main casing 29A is between 20Hz and 150Hz, the phase difference between the auxiliary casing 29B and the main casing 29A may be between-pi/3 to + pi/3. In this case, the auxiliary case 29B has good follow-up properties with respect to the main case 29A, and the vibration of the auxiliary case 29B and the skin contact area may be even in phase, so that the air in the rear cavity 112 can be compressed or expanded, and further, air conduction sound output to the outside of the earphone 100 through the sound outlet 113 can be formed. Further, when the vibration frequency of the main casing 29A is between 2kHz and 4kHz, the phase difference between the sub casing 29B and the main casing 29A may be between 2 pi/3 and 4 pi/3. At this time, the sub-housing 29B is inferior in following property with respect to the main housing 29A, and the vibration of the skin contact area of the sub-housing 29B may even be in opposite phase, and the air in the rear cavity 112 is difficult to be compressed or expanded, and thus it is difficult to form the air conduction sound outputted to the outside of the earphone 100 through the sound outlet 113.

In short, by properly designing the natural frequency of the auxiliary casing 29B, it is possible to control the earphone 100 to generate the air conduction sound outputted to the outside of the earphone 100 through the sound outlet hole 113 in a specific frequency band (for example, < f 0), and to significantly reduce the air conduction sound outputted to the outside of the earphone 100 through the sound outlet hole 113 in another frequency band (for example, > f 0), so as to supplement the specific frequency band of the bone conduction sound with the air conduction sound.

Similarly, when the vibration frequency of the main casing 29A is between 20Hz and 400Hz, the phase difference between the auxiliary casing 29B and the main casing 29A may be between-pi/3 and + pi/3. Further, when the vibration frequency of the main casing 29A is between 1kHz and 2kHz, the phase difference between the auxiliary casing 29B and the main casing 29A may be between 2 pi/3 and 4 pi/3; but this frequency band needs to avoid the natural frequency of the sub-housing 29B.

Based on the above-described related description, the skin contact area of the deck case 11 is used to contact the skin of the user so as to transmit the mechanical vibration generated by the deck module 10, thereby forming the bone conduction sound. The earphone 100 generates bone conduction sound, and the transducer 12 and the movement housing 11 move relatively. Further, due to the presence of the diaphragm 13, the relative movement also causes the back cavity 112 to generate an air conduction sound transmitted to the human ear through the sound outlet hole 113 in phase with the bone conduction sound. Based on this, the mechanical properties (e.g., elasticity, damping, mass) of the user's skin can adversely affect the vibration state of the movement module 10. Specifically, the closer the cartridge case 11 is attached to the skin of the user, the less the vibration of the cartridge case 11 becomes. Accordingly, the vibration of the movement housing 11 becomes weaker, so that the relative movement between the movement housing 11 and the transducer 12 and the diaphragm 13 becomes weaker, and the generated air-guide sound also becomes smaller, and the listening effect of the air-guide sound is finally affected. However, the movement housing 11 cannot be completely separated from the skin of the user, because this affects the transmission of the bone conduction sound, and thus affects the listening effect of the bone conduction sound. For this reason, when the earphone 100 is worn, the first region 31A of the skin contact area is disposed in close contact with the skin of the user, and the second region 31B of the skin contact area is disposed at an angle and spaced from the skin of the user, so as to achieve both the generation of the air conduction sound and the transmission of the bone conduction sound. Wherein the second region 31B can be remote from the earhook component 20 compared to the first region 31A.

As an example, the inclination angle between the second area 31B and the skin of the user may be between 0 degrees and 45 degrees. Preferably, the inclination angle may be between 10 and 30 degrees.

As an example, the first region 31A and the second region 31B may be disposed coplanar to reduce the difficulty of processing the movement housing 11. Of course, the movement housing 11 may be configured to have a curved surface, so that the first region 31A is configured to be attached to the skin of the user, and the second region 31B is configured to be inclined and spaced from the skin of the user.

As an example, the area of the second region 31B may be larger than that of the first region 31A to ensure generation of the air conduction sound.

Based on the above description, with reference to fig. 2 and 17, the pressure relief hole 114 may enable the front cavity 111 to communicate with the outside of the earphone 100, and the sound adjusting hole 117 may enable the rear cavity 112 to communicate with the outside of the earphone 100; and at least part of pressure relief vent 114 and at least part of sound control vent 117 may be disposed adjacent to each other, and the distance between them may be less than or equal to 2mm, for example, first pressure relief vent 1141 is disposed adjacent to first sound control vent 1171, and second pressure relief vent 1142 is disposed adjacent to second sound control vent 1172. Based on this, the movement module 10 may further include a protective cover 15, and the protective cover 15 may cover the periphery of the pressure relief hole 114 and the sound adjusting hole 117. The protective cover 15 can be woven by metal wires, the wire diameter of the metal wires can be 0.1mm, and the mesh number of the protective cover 15 can be 90-100, so that the protective cover has certain structural strength and good air permeability, and therefore foreign objects can be prevented from invading into the inner part of the movement module 10, and the acoustic expressive force of the earphone 100 can not be influenced. In this way, the protection cover 15 can cover the pressure relief hole 114 and the sound adjusting hole 117 which are adjacently arranged, i.e., "one cover covers two holes", so as to greatly reduce materials and improve the appearance quality of the earphone 100.

As an example, in conjunction with fig. 32, the outer surface of the movement housing 11 may be provided with a housing area 118, and the housing area 118 may communicate with outlet ends of the pressure relief hole 114 and the sound adjusting hole 117 which are adjacently provided. At this time, the protective cover 15 may be disposed in a plate shape, and may be fixed in the accommodating area 118 through one or a combination of clamping, bonding, welding, and the like, for example, bonded or welded to the bottom of the accommodating area 118 to cover the pressure relief hole 114 and the sound adjustment hole 117. Wherein, the outer surface of the protection cover 15 can be flush with or in arc transition with the outer surface of the movement housing 11, so as to improve the appearance quality of the earphone 100.

Further, a boss 1181 may be formed in the accommodating area 118, and the boss 1181 and a side wall of the accommodating area 118 are spaced apart to form an accommodating groove 1182 surrounding the boss 1181. The width of the receiving groove 1182 may be less than or equal to 0.3mm. At this time, outlet ends of the pressure relief hole 114 and the sound adjusting hole 117 are located at the top of the boss 1181, that is, the container 1182 may surround the pressure relief hole 114 and the sound adjusting hole 117. Accordingly, the shield 15 may include a main cover plate 151 and an annular side plate 152, and the annular side plate 152 is bent and connected to an edge of the main cover plate 151 to extend laterally of the main cover plate 151. Wherein, the height of the annular side plate 152 relative to the main cover plate 151 may be between 0.5mm and 1.0 mm. In this way, when the shield 15 is fixed in the containing area 118, the annular side plate 152 can be inserted into and fixed in the containing groove 1182, so as to improve the connection strength between the shield 15 and the movement housing 11. For example, the annular side plate 152 is fixedly connected to the movement housing 11 through a glue (not shown) in the containing groove 1182. Further, the main cover 151 may also be connected to the top of the boss 1181 by welding. The top of the boss 1181 may be slightly lower than the outer surface of the movement housing 11, for example, the difference between the two may be approximately equal to the thickness of the main cover 151.

Based on the above description, with reference to fig. 32 and fig. 2, the outlet ends of the pressure release hole 114 and the sound adjusting hole 117 may be covered with an acoustic resistance net 1140 and an acoustic resistance net 1170, respectively, to adjust the effective areas of the outlet ends of the pressure release hole 114 and the sound adjusting hole 117, respectively, so as to improve the acoustic performance of the earphone 100. At this point, the acoustically resistive mesh 1140 and the acoustically resistive mesh 1170 may be first secured to the top of the boss 1181 by a first annular strip 1183, and the mask 15 may then be secured within the containment region 118. Wherein, the first annular rubber piece 1183 surrounds the pressure relief vent 114 and the sound adjusting vent 117 to expose the outlet ends of the two. Further, the main cover 151 may also be fixed to the acoustic resistive mesh 1140 and the acoustic resistive mesh 1170 by a second ring-shaped rubber 1184. The widths of the first and second

annular rubber pieces

1183 and 1184 may be between 0.4mm and 0.5mm, and the thicknesses may be less than or equal to 0.1mm. Of course, in other embodiments, the acoustic resistive mesh 1140 and the acoustic resistive mesh 1170 may be pre-attached to the enclosure 15 to form a structural assembly, which is then attached to the receiving area 118. For example: the acoustically resistive mesh 1140 and the acoustically resistive mesh 1170 are secured to the same side of the main cover 151 by a second annular strip 1184 and are surrounded by annular skirt 152 to form a structural assembly with the mask 15. The acoustic resistance net 1140 and the acoustic resistance net 1170 may be at least partially staggered from each other, so as to cover the outlet ends of the pressure relief hole 114 and the sound adjusting hole 117, which are adjacently disposed, respectively, and to adapt to the spacing distance therebetween.

It should be noted that: referring to fig. 2, the end of the sound guide 14 away from the movement housing 11 may also be fixedly provided with the acoustic resistance mesh 140 and the corresponding protective cover 15 in a manner similar to or the same as any of the above manners, so that the acoustic resistance mesh 140 covers the outlet end of the sound guide channel 141 and is covered by the corresponding protective cover 15.

Referring to fig. 33 and 2, the coil support 121 may be exposed from a side of the front case 116 in a direction perpendicular to a fastening direction of the rear case 115 and the front case 116. In other words, referring to fig. 4, for the front housing 116, a side of the front cylindrical side plate 1162 adjacent to the sound outlet hole 113 or the sound guide member 14 may be at least partially cut away to form an escape area for exposing the coil support 121. Further, the sound guide 14 may be fastened to the exposed portion of the coil support 121 and the outside of the rear case 115, and may allow the sound outlet channel 141 to communicate with the sound outlet hole 113. In this way, the side of the front housing 116 adjacent to the sound guide component 14 does not need to completely wrap the coil support 121, which can avoid the core module 10 from being too thick locally and does not hinder the fixing between the sound guide component 14 and the core housing 11.

Illustratively, the exposed portion of the coil support 121 and the outer side of the rear housing 115 may cooperate to form a boss 119. Among them, the boss 119 may include a first sub-boss portion 1191 located at the rear case 115 and a second sub-boss portion 1192 located at the coil support 121. At this time, the sound outlet holes 113 may be entirely provided in the rear case 115, and the outlet ends of the sound outlet holes 113 may be located at the top of the first sub-boss portion 1191. Accordingly, the side of the sound guide member 14 facing the coil support 121 and the rear case 115 may be provided with a recessed area 142. At this time, the inlet end of the sound guide channel 141 may communicate with the bottom of the depression 142. In this manner, when the sound guide 14 is assembled with the deck case 11, the boss 119 may be embedded in the recessed area 142, and the sound emission channel 141 and the sound emission hole 113 are made to communicate. In conjunction with fig. 2, the height of the projection 119 and the depth of the recessed region 142 may satisfy the following relationship: when the top of the boss 119 abuts against the bottom of the recessed area 142, the end face of the sound guide 14 is in contact with the movement case 11, or a gap is left between the two, to improve the airtightness between the sound guide passage 141 and the sound outlet hole 113. Based on this, an annular sealing member (not shown) or the like may be further provided between the top of the boss 119 and the bottom of the recessed region 142.

Further, one of the rear housing 115 and the sound guide member 14 may be provided with a patch hole 1154 thereon; accordingly, the other may be provided with a socket post 143. The plug posts 143 can be inserted and fixed in the plug holes 1154, so as to improve the accuracy and reliability of assembling the sound guide member 14 with the movement housing 11. As an example, a patch jack 1154 is provided in the rear housing 115, which may be located in the first sub-boss portion 1191; the receiving posts 143 are disposed on the sound guide assembly 14 and may be located in the recessed area 142.

It should be noted that: referring to fig. 33, the sound guide member 14 and the deck case 11 may be assembled in a direction indicated by a broken line in fig. 33.

In some embodiments, for example, the movement module 10 is not provided with the diaphragm 13, the front housing 116 may press the coil support 121 against the annular platform 1153, so as to improve the reliability of the assembly of the movement module 10. Specifically, the front housing 116 may press the other end of the second cylindrical holder portion 1213, which is away from the annular main body portion 1211, against the annular receiving base 1153.

In other embodiments, such as the movement module 10 is provided with the diaphragm 13, the front housing 116 can press the coil support 121 and the diaphragm 13 connected thereto on the annular platform 1153 together, so as to improve the reliability of the assembly of the movement module 10. The diaphragm 13 may be connected to the other end of the second cylindrical holder portion 1213 away from the annular main body portion 1211 through the reinforcing ring 136 thereof. Specifically, the front housing 116 can press the reinforcement ring 136 against the annular base 1153 via the second cylindrical bracket portion 1213.

As an example, in conjunction with fig. 33 and 4, the tuning hole 117 may be provided in the form of a complete through hole in the rear case 115; the pressure relief hole 114 may be provided in the front housing 116 in the form of an incomplete notch, and a complete through hole is formed by splicing and matching the rear housing 115 and the front housing 116. Thus, the spacing distance between the pressure relief hole 114 and the sound adjusting hole 117 which are adjacently arranged is reduced, and the actual area of the outlet end of the pressure relief hole 114 is larger than that of the outlet end of the sound adjusting hole 117.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes performed by the content of the present application and the attached drawings, or directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. The earphone is characterized by comprising a core module, wherein the core module comprises a core shell, a transduction device and a vibrating diaphragm, the core shell is used for contacting with the skin of a user and forming an accommodating cavity, the transduction device is arranged in the accommodating cavity and connected with the core shell, so that a skin contact area of the core shell generates bone conduction sound under the action of the transduction device, the vibrating diaphragm is connected between the transduction device and the core shell to divide the accommodating cavity into a front cavity close to the skin contact area and a rear cavity far away from the skin contact area, the core shell is provided with a sound outlet communicated with the rear cavity, and the vibrating diaphragm generates air conduction sound transmitted to human ears through the sound outlet in the relative movement process of the transduction device and the core shell;

the movement shell is further provided with a pressure release hole communicated with the front cavity and a tone adjusting hole communicated with the rear cavity, the tone adjusting hole is adjacent to the pressure release hole, and the effective area of the outlet end of the tone adjusting hole is smaller than that of the outlet end of the pressure release hole.

2. The earphone according to claim 1, wherein a ratio between an effective area of an outlet end of the pressure relief hole and an effective area of an outlet end of the tone tuning hole is less than or equal to 2.

3. The earpiece of claim 2, wherein an effective area of an outlet end of the toning aperture is greater than or equal to 1.5mm2.

4. The earphone of claim 1, wherein the actual area of the outlet end of the tone tuning hole is smaller than the actual area of the outlet end of the pressure relief hole.

5. The earphone according to claim 4, wherein the actual area of the outlet end of the pressure relief hole is greater than or equal to 2.6mm2.

6. The earphone according to claim 4, wherein the outlet end cap of the pressure relief hole is provided with a first acoustic resistance net, the outlet end cap of the tone tuning hole is provided with a second acoustic resistance net, and the porosity of the second acoustic resistance net is smaller than that of the first acoustic resistance net.

7. The earphone according to claim 1, wherein a frequency response curve of the air conduction sound outputted to the outside of the earphone through the sound outlet hole has a resonance peak, a peak resonance frequency of the resonance peak when the tuning hole is in an open state is shifted to a high frequency compared with a peak resonance frequency of the resonance peak when the tuning hole is in a closed state, and the shift amount is greater than or equal to 500Hz.

8. The earpiece of claim 7, wherein the peak resonant frequency of the resonant peak when the tuning hole is in the open state is greater than or equal to 2kHz.

9. The earphone according to claim 1, wherein the core module further comprises a sound guide member connected to the core housing, the sound guide member being provided with a sound guide channel, the sound guide channel being in communication with the sound outlet hole and being configured to guide the air-guided sound to the human ear, an effective area of an outlet end of the sound guide channel being larger than an effective area of an outlet end of the sound adjustment hole.

10. The earphone of claim 9, wherein the effective area of the outlet end of the sound guide channel is larger than the effective area of the outlet end of the pressure relief vent.