CN115209281B

CN115209281B - A headset

Info

Publication number: CN115209281B
Application number: CN202110383311.0A
Authority: CN
Inventors: 张磊; 王真; 王力维; 童珮耕
Original assignee: Shenzhen Voxtech Co Ltd
Current assignee: Shenzhen Voxtech Co Ltd
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2025-03-07
Anticipated expiration: 2041-04-09
Also published as: CN115209281A

Abstract

The application mainly relates to an earphone, wherein a core shell is used for being contacted with the skin of a user, a transduction device enables a skin contact area of the core shell to generate bone conduction sound under the action of the transduction device, a vibrating diaphragm divides a containing cavity into a front cavity and a rear cavity, the core shell is provided with a sound outlet communicated with the rear cavity, the vibrating diaphragm generates air conduction sound transmitted to a human ear through the sound outlet in the process of relative movement of the transduction device and the core shell, the core shell is provided with a sound regulating hole communicated with the rear cavity, a high-pressure area of the rear cavity can be destroyed, the wavelength of standing waves in the rear cavity is reduced, the peak resonance frequency of a resonance peak in a frequency response curve of the air conduction sound is shifted to a high frequency offset, the core shell is connected with a sound guiding component for guiding the air conduction sound to the human ear, the distance between the sound outlet and the human ear is shortened, the effective area of an outlet end of a sound guiding channel is larger than that of the sound outlet end of the sound regulating hole, and the user can conveniently hear the air conduction sound output by the sound guiding channel more.

Description

Earphone

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, the electronic devices have become indispensable social and entertainment tools in daily life, and the requirements of people on the electronic devices are also increasing. Taking an electronic device such as an earphone as an example, not only is excellent wearing comfort required, but also sound quality with bass diving and treble penetration and good cruising ability are required.

Disclosure of Invention

The embodiment of the application provides an earphone, which comprises a core module, wherein the core module comprises a core shell, a transduction device and a vibrating diaphragm, the core shell is used for being in contact with the skin of a user and forming a containing cavity, the transduction device is arranged in the containing cavity and is connected with the core shell, so that a skin contact area of the core shell generates bone sound under the action of the transduction device, the vibrating diaphragm is connected between the transduction device and the core shell to divide the containing 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, the vibrating diaphragm generates air sound transmitted to a human ear through the sound outlet in the process of relative movement of the transduction device and the core shell, the core module further comprises at least one sound guide hole communicated with the rear cavity, the sound guide part is provided with a sound guide channel, the sound guide channel is communicated with the sound outlet and is used for guiding the air sound to the human ear, and the effective area of the outlet end of the sound guide channel is larger than that of the outlet end of each sound guide hole.

The earphone has the beneficial effects that the vibrating diaphragm is arranged between the transduction device and the core shell, so that the earphone can output bone conduction sound and air conduction sound, and the acoustic expressive force of the earphone can be improved. Furthermore, the sound guide component is used for guiding the air guide sound to the human ear, so that the directivity of the air guide sound can be changed, the distance between the sound guide hole and the human ear can be shortened, and the strength of the air guide sound can be further improved. Further, through the sound adjusting holes communicated with the rear cavity, the high-voltage area of the rear cavity can be damaged, and then the wavelength of standing waves in the rear cavity is reduced, so that the peak resonance frequency of air guiding sound output to the outside of the earphone through the sound outlet holes is shifted to high frequency, the acoustic expressive force of the earphone is improved, and the effective area of the outlet end of the sound guiding channel is larger than that of the outlet end of each sound adjusting hole, so that a user can hear the air guiding sound output to the outside of the earphone through the sound outlet holes and the sound guiding channel more.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an embodiment of an earphone according to the present application;

FIG. 2 is a schematic cross-sectional view of an embodiment of a deck module according to the present application;

fig. 3 is a schematic diagram showing a comparison of frequency response curves of the earphone provided by the application before and after a vibrating diaphragm is arranged;

FIG. 4 is a schematic cross-sectional view of an embodiment of a cartridge case according to the present application;

FIG. 5 is a schematic cross-sectional view of an embodiment of a transducer device according to the present application;

FIG. 6 is a schematic view of a partial cross-sectional structure of various embodiments of a diaphragm provided by the present application;

FIG. 7 is a schematic view of a partial cross-sectional structure of a diaphragm according to the present application;

FIG. 8 is a schematic structural diagram of various embodiments of an acoustic guide member provided by the present application;

FIG. 9 is a schematic top view of an embodiment of an acoustically resistive mesh provided by the present application;

FIG. 10 is a schematic diagram of the frequency response of the air conduction sound at the sound guide part of an embodiment of the earphone provided by the application;

FIG. 11 is a schematic diagram of the frequency response of the air conduction sound at the sound guide part of an embodiment of the earphone according to the present application;

FIG. 12 is a schematic diagram of the frequency response of the air conduction sound at the pressure release hole of an earphone according to an embodiment of the present application;

FIG. 13 is a schematic diagram showing the comparison of sound pressure distribution of the front and rear chambers of the movement module provided with the sound adjusting holes;

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

FIG. 15 is a schematic diagram of the frequency response of the air conduction sound at the sound guide member of an embodiment of the earphone provided by the application;

FIG. 16 is a schematic diagram of a sound leakage curve of a movement module according to the present application;

FIG. 17 is a schematic diagram of a movement module according to an embodiment of the present application;

FIG. 18 is a schematic diagram of a movement module according to an embodiment of the present application;

FIG. 19 is a graph showing the comparison of the frequency response curves of the air guide sound at the front and rear pressure release holes of the communication hole of the movement module provided by the application;

FIG. 20 is a schematic view of an embodiment of a coil support according to the present application;

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

FIG. 22 is a schematic diagram of the frequency response of the air conduction sound at the sound guide member of an embodiment of the earphone provided by the present application;

FIG. 23 is a schematic diagram of an audio response curve of a movement module according to the present application;

FIG. 24 is a schematic diagram of the frequency response of the air conduction sound at the sound guide member of an embodiment of the earphone provided by the present application;

FIG. 25 is a schematic diagram of the schematic structure of various embodiments of a movement module provided by the present application;

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

FIG. 27 is a schematic diagram of the frequency response of the air conduction sound at the sound guide of an embodiment of the earphone provided by the application;

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

FIG. 29 is a schematic diagram of a movement module according to an embodiment of the present application;

FIG. 30 is a schematic diagram of the frequency response of the air conduction sound at the sound guide member of an embodiment of the earphone provided by the present application;

FIG. 31 is a schematic diagram of an earphone according to an embodiment of the present application;

FIG. 32 is a schematic diagram of an exploded view of an embodiment of a deck module provided by the present application;

fig. 33 is an exploded view of an embodiment of a deck module according to the present application.

Detailed Description

The application is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present application, but do not limit the scope of the present application. Likewise, the following examples are only some, but not all, of the examples of the present application, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the 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 may be included in the embodiment of the application. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.

Referring to fig. 1, headset 100 may include two deck modules 10, two ear-hook assemblies 20, and a rear-hook assembly 30. Wherein, two ends of the back hanging component 30 are respectively connected with one end of a corresponding one of the ear hanging components 20, and the other end of each of the ear hanging components 20, which is away from the back hanging component 30, is respectively connected with a corresponding one of the movement modules 10. Further, the rear hanging assembly 30 may be configured to be bent for being wound around the back side of the user's head, the ear hanging assembly 20 may also be configured to be bent for being hung between the user's ear and the head, so as to facilitate the wearing requirement of the earphone 100, and the deck module 10 is configured to convert the electrical signal into mechanical vibration, so that the user can hear the sound through the earphone 100. In this way, when the earphone 100 is in the wearing state, the two core modules 10 are respectively located on the left side and the right side of the head of the user, the two core modules 10 also press the head of the user under the cooperation of the two ear-hook assemblies 20 and the rear-hook assembly 30, and the user can also hear the sound output by the earphone 100.

It should be noted that the earphone 100 may be worn by other ways, such as the ear-hook assembly 20 covering or wrapping around the ear of the user, and the back-hook assembly 30 straddling the top of the head of the user, which are not shown here.

Referring to fig. 1, the earphone 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 accommodating chambers of the same ear-hook assembly 20, or may be disposed in the accommodating chambers of the two ear-hook assemblies 20, respectively. Further, the main control circuit board 40 and the battery 50 can be electrically connected with the two deck modules 10 through corresponding wires, the former can be used for controlling the deck modules 10 to convert electrical signals into mechanical vibrations, and the latter can be used for providing electrical energy to the earphone 100. Of course, the earphone 100 of the present application may further include a microphone, such as a microphone, and a communication element, 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 two movement modules 10 are provided in the present application, and both movement modules 10 can convert electric signals into movement vibrations, mainly for facilitating the earphone 100 to realize stereo sound effects. Therefore, in other application scenarios where the stereo requirement is not particularly high, such as hearing assistance for a hearing patient, live-broadcast word-improving for a host, the earphone 100 may be provided with only one movement module 10.

Based on the above-described related description, the deck module 10 is configured to convert an electrical signal into mechanical vibration in an energized state so that a user can hear sound through the earphone 100. In general, the aforementioned mechanical vibration may directly act on the user's auditory nerve based on the principle of bone conduction and mainly via the user's bones and tissues, or may act on the user's tympanic membrane based on the principle of air conduction and mainly via air, thereby acting on the auditory nerve. For the sound heard by the user, the former may be simply referred to as "bone conduction sound", and the latter may be simply referred to as "air conduction sound". Based on this, the movement module 10 can form both bone conduction and air conduction, and can also form both bone conduction and air conduction.

Referring to fig. 2 and 1, the deck module 10 may include a deck housing 11 and a transducer device 12. Wherein the deck housing 11 is connected to one end of the ear-hook assembly 20 and is adapted to contact the skin of the user. Further, the movement housing 11 further forms a receiving chamber (not shown), and the transducer 12 is disposed in the receiving chamber and connected to the movement housing 11. The transducer device 12 is configured to convert an electrical signal into mechanical vibration in an energized state, such that a skin contact area of the cartridge case 11 (e.g., the front chassis 1161 shown in fig. 4) is capable of generating bone conduction under the influence of the transducer device 12. In this way, when the user wears the earphone 100, the transducer 12 converts the electrical signal into the movement vibration to drive the skin contact area to generate the mechanical vibration together therewith, and the mechanical vibration then directly acts on the acoustic nerve of the user through the bone and tissue of the user as a medium, so that the user can hear the bone conduction sound through the movement module 10.

Further, the cartridge module 10 may further include a diaphragm 13 connected between the transducer 12 and the cartridge housing 11, where the diaphragm 13 is configured to partition an inner space of the cartridge housing 11 (i.e., the accommodating cavity) into a front cavity 111 near the skin contact area and a rear cavity 112 far from the skin contact area. In other words, when the user wears the earphone 100, the front cavity 111 may be closer to the user than the rear cavity 112. Wherein, the core shell 11 is provided with an acoustic hole 113 communicated with the rear cavity 112, and the vibrating diaphragm 13 can generate air guide sound transmitted to the human ear through the acoustic hole 113 in the process of the relative movement of the transducer 12 and the core shell 11. In this way, the sound generated in the rear cavity 112 can be transmitted through the sound outlet 113 and then act on the tympanic membrane of the user through the air as a medium, so that the user can also hear the air guide sound through the deck module 10.

It should be noted that when the transducing device 12 moves the skin contact area in a direction approaching the face of the user, it can be simply regarded as bone conduction enhancement, in conjunction with fig. 2. At the same time, the portion of the movement housing 11 opposite to the aforementioned skin contact area moves in a direction approaching the face of the user, and the transducer 12 and the diaphragm 13 connected thereto move in a direction away from the face of the user due to the relationship between the force and the reaction force, so that the air in the rear chamber 112 is pressed corresponding to the increase in air pressure, with the result that the sound transmitted through the sound output hole 113 is enhanced, which can be simply regarded as air conduction sound enhancement. Accordingly, when bone conduction sound is reduced, air conduction sound is also reduced. Based on this, the bone conduction sound and the air conduction sound generated by the movement module 10 in the present application have the same phase. Further, since the front cavity 111 and the rear cavity 112 are generally separated by the diaphragm 13 and the transducer 12, the air pressure in the front cavity 111 is exactly opposite to the air pressure in the rear cavity 112. Based on this, the deck housing 11 may be further provided with a pressure relief hole 114 communicating with the front cavity 111, the pressure relief hole 114 enabling the front cavity 111 to communicate with the external environment, i.e. air can freely enter and exit the front cavity 111. In this way, the change in air pressure in the rear chamber 112 can be prevented from being retarded by the front chamber 111 as much as possible, so that the acoustic expressive force of the air guide sound generated by the deck module 10 can be effectively improved. The pressure relief hole 114 and the sound outlet hole 113 are staggered, i.e. are not adjacent, so as to avoid noise reduction caused by opposite phases.

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 in order for the user to hear more air-guide sound. Wherein the actual area of the inlet end of the sound outlet 113 may also be greater than or equal to the actual area of the outlet end thereof.

It should be noted that, because the structural members such as the cartridge case 11 have a certain thickness, the through holes such as the sound outlet 113 and the pressure relief hole 114 formed in the cartridge case 11 have a certain depth, and further, the through holes have an inlet end close to the accommodating cavity and an outlet end far from the accommodating cavity, relative to the accommodating cavity. Further, the actual area of the outlet end according to the present application may be defined as the area of the end face where the outlet end is located.

In this way, since the air conduction sound and the bone conduction sound generated by the core module 10 are in the same vibration source (i.e. the transducer 12), and the phases of the air conduction sound and the bone conduction sound are the same, the sound heard by the user through the earphone 100 can be stronger, the earphone 100 can save more electricity, and the cruising ability of the earphone 100 is further prolonged. In addition, by reasonably designing the structure of the deck module 10, it is also possible to make the air guide sound and the bone guide sound cooperate with each other on the frequency band of the frequency response curve, so that the earphone 100 can have excellent acoustic expressive force in a specific frequency band. For example, the low frequency band of the bone conduction sound is compensated by the air conduction sound, and then the middle frequency band and the middle and high frequency bands of the bone conduction sound are reinforced by the air conduction sound.

In the application, the frequency range corresponding to the low frequency band can be 20-150Hz, the frequency range corresponding to the medium frequency band can be 150-5kHz, and the frequency range corresponding to the high frequency band can be 5k-20kHz. The frequency range corresponding to the middle and low frequency bands can be 150-500Hz, and the frequency range corresponding to the middle and high frequency bands can be 500-5kHz.

Based on the detailed description above, and in connection with fig. 3, the skin contact area is capable of generating bone conduction sounds under the influence of the transducer means 12, which bone conduction sounds then have a frequency response curve accordingly. Wherein the aforementioned frequency response curve may have at least one resonance peak. Further, the peak resonance frequency of the resonance peak can satisfy the relation of |f1-f2|/f1 is less than or equal to 50%. In addition, the difference between the peak resonance intensity corresponding to f1 and the peak resonance intensity corresponding to f2 may be less than or equal to 5db. Wherein f1 is the peak resonance frequency of the resonance peak when the diaphragm 13 is connected with the transducer 12 and the cartridge case 11, and f2 is the peak resonance frequency of the resonance peak when the diaphragm 13 is disconnected with any one of the transducer 12 and the cartridge case 11. In other words, |f1-f2|/f1 may be used to measure the magnitude of the effect of the diaphragm 13 on the aforementioned skin contact area of the transducer means 12, wherein a smaller ratio indicates a smaller effect. Therefore, on the basis of not affecting the original resonance system of the core module 10 as much as possible, the core module 10 can synchronously output bone conduction sound and air conduction sound with the same phase by introducing the vibrating diaphragm 13, so that the acoustic expressive force of the core module 10 is improved, and more electricity is saved.

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

It should be noted that, in conjunction with fig. 3, this embodiment may define that the skin contact area has a first frequency response curve (e.g., k1+k2 in fig. 3) when the diaphragm 13 is connected to the transducer 12 and the cartridge case 11, and that the skin contact area has a second frequency response curve (e.g., k1 in fig. 3) when the diaphragm 13 is disconnected from either of the transducer 12 and the cartridge case 11. Further, for the frequency response curve of the present application, the horizontal axis may represent frequency in Hz and the vertical axis may represent intensity in dB.

Referring to fig. 4 and 2, the deck 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 spliced together to form a receiving cavity for accommodating structural components such as the transducer 12 and the diaphragm 13. Further, the front case 116 is for contact with the skin of the user to form a skin contact area of the cartridge case 11, that is, when the cartridge case 11 is in contact with the skin of the user, the front case 116 is closer to the user than the rear case 115. Based on this, the transduction device 12 may be connected to the front case 116 so that the transduction device 12 brings the skin contact area of the cartridge case 11 with it to generate mechanical vibrations. Further, the sound outlet 113 may be provided in the rear case 115, and the pressure release hole 114 may be provided in the front case 116. The diaphragm 13 may be connected to the rear housing 115, may be connected to the front housing 116, and may be connected to a junction between the rear housing 115 and the front housing 116.

As an example, the rear housing 115 may include a rear bottom plate 1151 and a rear cylindrical side plate 1152 integrally connected, with an end of the rear cylindrical side plate 1152 facing away from the rear bottom plate 1151 being connected to the front housing 116. The sound emission hole 113 may be provided in the rear cylindrical side plate 1152.

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

As an example, 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 with the rear housing 115. The area of the front panel 1161 may be simply referred to as the skin contact area of the present application. Accordingly, relief holes 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 piece 124 are disposed within the front cavity 111. The central region of the spring plate 124 may be connected to the magnetic circuit 122, and the peripheral region of the spring plate 124 may be connected to the deck housing 11 through the coil bracket 121 to suspend the magnetic circuit 122 within the deck housing 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 body portion 1211 and a first cylindrical holder portion 1212, one end of the first cylindrical holder portion 1212 being connected to the annular body portion 1211. The annular body 1211 may be connected to a peripheral region of the spring plate 124, and the two may be formed into an integral structure by a metal insert injection molding process. At this time, the annular body 1211 may be connected to the front bottom plate 1161 by one or a combination of connection methods such as adhesive bonding and clamping. Further, the coil 123 is connected to the other end of the first cylindrical holder portion 1212 facing away from the annular main body portion 1211 so that the coil extends into the magnetic circuit 122. At this time, a part of the diaphragm 13 may be connected to the magnetic circuit 122, and another part 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 body portion 1211, the second cylindrical holder portion 1213 surrounding the first cylindrical holder portion 1212 and extending in a lateral direction of the annular body portion 1211 in the same direction as the first cylindrical holder portion 1212. Wherein the second cylindrical holder portion 1213 and the annular body portion 1211 may be connected together with the front case 116 to increase the connection strength between the coil holder 121 and the cartridge 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 1213 is connected to the rear cylindrical side plate 1152. Accordingly, the second cylindrical holder portion 1213 may be provided with a relief hole 1214 in communication with the relief hole 114 to avoid the second cylindrical holder portion 1213 blocking connectivity between the relief hole 114 and the front cavity 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 bracket 1213 facing away from the annular main body 1211, and further connected to the deck housing 11. Based on this, after the deck module 10 is assembled, the other end of the second cylindrical holder portion 1213 facing away from the annular body portion 1211 may press another portion of the diaphragm 13 against the annular mount 1153.

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

As an example, the magnetic circuit 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 integrally connected. Further, the magnet 1222 is disposed in the cylindrical side plate 1224 and fixed to the bottom plate 1223, and a side of the magnet 1222 facing away from the bottom plate 1223 may be connected to an intermediate region of the spring plate 124 by a connector 1225, such that the coil 123 extends into a magnetic gap between the magnet 1222 and the magnetic shield 1221. At this time, a part of the diaphragm 13 may be connected to the magnetic cover 1221.

It should be noted that the magnet 1222 may be a magnet group formed by a plurality of sub-magnets. Furthermore, a magnetic conductive plate (not shown) may be provided on the side of the magnet 1222 facing away from the base plate 1223.

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 integrally connected. The first connection portion 132 surrounds the transducer 12 and is connected to the transducer 12, the second connection portion 134 surrounds 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 12, and the fold portion 133 is located in a spaced region 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.

The first connection portion 132 may be provided in a cylindrical shape and may be connected to the magnetically conductive cover 1221, and the second connection portion 134 may be provided in a ring shape and may be connected to the other end of the second cylindrical holder portion 1213 facing away from the annular body portion 1211 and further connected to the deck housing 11. In conjunction with fig. 5, the connection point between the fold portion 133 and the first connection portion 132 may be lower than the end surface of the cylindrical side plate 1224 facing away from the bottom plate 1223.

Further, the fold portion 133 forms a recess 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 perform a relative movement in the vibration direction of the transducer 12, thereby reducing the influence of the diaphragm 13 on the transducer 12. Wherein, in conjunction with fig. 2, the recessed region 135 may be recessed toward the rear cavity 112. Of course, the recessed area 135 may also be recessed toward the front cavity 111, i.e., in the opposite direction to the recessed area 135 shown in fig. 2.

It should be noted that the number of the concave regions 135 may be plural, for example, two or three, and may be distributed at intervals in a direction perpendicular to the vibration direction of the transducer 12, and the depth of each concave region 135 in the vibration direction of the transducer 12 may be different. The present embodiment is exemplified by taking the number of the concave regions 135 as one example.

As an example, the material of the diaphragm body 131 may be any one of Polycarbonate (PC), polyamide (Polyamides, PA), acrylonitrile-butadiene-styrene copolymer (Acrylonitrile Butadiene Styrene, ABS), polystyrene (Polystyrene, PS), high impact polystyrene (HIGH IMPACT Polystyrene, HIPS), polypropylene (PP), polyethylene terephthalate (Polyethylene Terephthalate, PET), polyvinyl chloride (Polyvinyl Chloride, PVC), polyurethane (PU), polyethylene (PE), phenolic resin (Phenol Formaldehyde, PF), urea-formaldehyde resin (Urea-Formaldehyde, UF), melamine-formaldehyde resin (Melamine-Formaldehyde, MF), polyarylate (PAR), polyetherimide (PEI), polyimide (PI), polyethylene naphthalate (Polyethylene Naphthalate two formic acid glycol ester, PEN), polyetheretherketone (PEEK), silicone gel, and the like, or a combination thereof. The PET is thermoplastic polyester, the diaphragm made of the PET is often called Mylar (Mylar) film, the PC has strong shock resistance and stable size after being molded, the PAR is a advanced version of the PC mainly for environmental protection, the PEI is softer than the PET, the internal damping is higher, the PI is high-temperature resistant, the molding temperature is higher, the processing time is long, the PEN strength is high, the PEN strength is harder, the PEN is characterized by being capable of being coated with color, dyed and plated, the PU is commonly used for a damping layer or a folding ring of a composite material, the elasticity is high, the internal damping is high, and the PEEK is a novel material and is friction resistant and fatigue resistant. It is noted that the composite material can generally take account of the characteristics of various materials, such as a double-layer structure (generally hot-pressed PU to increase internal resistance), a three-layer structure (sandwich structure, sandwich damping layer PU, acrylic adhesive, UV adhesive, pressure-sensitive adhesive), and a five-layer structure (two films are bonded by double-sided adhesive, and double-sided adhesive has a base layer, generally PET).

Further, the diaphragm 13 may further include a reinforcing ring 136, and the reinforcing ring 136 may have a hardness greater than that of the diaphragm body 131. Wherein, the reinforcing ring 136 may be provided in a ring shape, and the ring width thereof may be greater than or equal to 0.4mm, and the thickness thereof may be less than or equal to 0.4mm. Further, the reinforcing ring 136 is connected to the second connecting portion 134 such that the second connecting portion 134 is connected to the deck housing 11 through the reinforcing ring 136. In this way, the structural strength of the edge of the diaphragm 13 is increased, and the connection strength between the diaphragm 13 and the cartridge housing 11 is further increased.

It should be noted that the reinforcing ring 136 is provided in a ring shape, mainly for the purpose of adapting to the annular structure of the second connecting portion 134, but the reinforcing ring 136 may be a continuous complete ring or a discontinuous segment ring in structure. Further, after the movement module 10 is assembled, the other end of the second cylindrical bracket portion 1213 facing away from the annular main body portion 1211 may press the reinforcing ring 136 against the annular cap 1153.

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

Referring to fig. 6, various structural modifications of the diaphragm body 131 are mainly illustrated in fig. 6 (a) to (d), and the main difference therebetween is the specific structure of the corrugated portion 133. In fig. 6 (a), the fold portion 133 may be symmetrically disposed, and two ends thereof may be 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 may coincide. In fig. 6 (b), the fold portion 133 may be mostly formed 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 (c) of fig. 6, the pleat 133 may be provided 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. In fig. 6 (d), the fold portion 133 may be provided in an asymmetric structure, and both ends thereof are not coplanar with the connection points formed by the first connection portion 132 and the second connection portion 134, respectively.

Based on the above-described related description, for the diaphragm 13, the softer the diaphragm body 131, the more easily the elastic deformation occurs, and the less the influence on the transducer 12 is exerted, on the premise that the diaphragm body 131 has 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, and preferably, the thickness of the diaphragm body 131 may be less than or equal to 0.1mm. Here, the elastic deformation of the diaphragm body 131 may mainly occur at the corrugation 133. Therefore, the thickness of the corrugated portion 133 may be smaller than the thickness of the other portions of the diaphragm body 131. Based on this, the thickness of the corrugated portion 133 may be less than or equal to 0.2mm, and preferably, the thickness of the corrugated portion 133 may be less than or equal to 0.1mm. In this embodiment, the diaphragm body 131 is exemplified as an equal-thickness structure.

Referring to fig. 7, the recess 135 may have a depth H in the vibration direction of the transducer 12, and the recess 135 may have a half-depth width W1 in the perpendicular direction to the vibration direction of the transducer 12, and a separation distance W2 between the first connection portion 132 and the second connection portion 134. Wherein, W1/W2 is more than or equal to 0.2 and less than or equal to 0.6, which not only can ensure the size of the deformable area on the fold part 133, but also can avoid the structural interference between the fold part 133 and the first connecting part 132 and/or the movement shell 11. Similarly, 0.2.ltoreq.H/W2.ltoreq.1.4, which ensures the size of the deformable region on the folded portion 133 so as to be sufficiently soft, and also prevents structural interference between the folded portion 133 and the first connecting portion 132 and/or the deck housing 11, and prevents the folded portion 133 from being hard to vibrate due to excessive self weight.

The half-depth width W1 refers to the width of the recess 135 at a depth of 1/2H.

Further, the pleat 133 may include a first transition 1331, a second transition 1332, a third transition 1333, a fourth transition 1334, and a fifth transition 1335 that are integrally connected. One end of the first transition section 1331 and one end of the second transition section 1332 may be connected to the first connection portion 132 and the second connection portion 134, respectively, and extend toward each other, one end of the third transition section 1333 and one end of the fourth transition section 1334 are connected to the other end of the first transition section 1331 and the other end of the second transition section 1332, and two ends of the fifth transition section 1335 are connected to the other end of the third transition section 1333 and the other end of the fourth transition section 1334, respectively. At this time, the transition sections are collectively surrounded to form a concave region 135. Wherein an angle between a tangent line (e.g., a broken line TL 1) of the first transition 1331 toward the recess 135 side and the vibration direction of the transducer 12 may gradually decrease in a direction from a connection point (e.g., a point 7A) between the first transition 1331 and the first connection portion 132 to a reference position point (e.g., a point 7C) of the bellows 133 farthest from the first connection portion 132, and similarly, an angle between a tangent line (e.g., a broken line TL 2) of the second transition 1332 toward the recess 135 side and the vibration direction of the transducer 12 may gradually decrease in a direction from a connection point (e.g., a point 7B) between the second transition 1332 and the second connection portion 134 to the aforementioned reference position point, so that the recess 135 may be recessed toward the rear cavity 112. Further, the angle between the tangent line of the third transition 1333 (e.g., the broken line TL 3) toward the side of the recessed region 135 and the vibration direction of the transducer 12 may be maintained constant or gradually increased, and similarly, the angle between the tangent line of the fourth transition 1334 (e.g., the broken line TL 4) toward the side of the recessed region 135 and the vibration direction of the transducer 12 may be maintained constant or gradually increased. At this time, the fifth transition 1335 may be provided in an arc shape.

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

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

As an example, the first and second transition sections 1331 and 1332 may be provided in a circular arc shape, respectively. 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 local excessive bending degree of the fold portion 133, and further increase the reliability of the diaphragm 13. Of course, in other embodiments, the first transition 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 1333, the flat section being connected to the first connection portion 132, and the second transition 1332 may be similar to the first transition 1331.

Based on the above detailed description, and with reference to fig. 7, the thickness of the diaphragm body 131 may be 0.1mm. Wherein, the W1 is more than or equal to 0.9mm, the H is more than or equal to 0.3mm and less than or equal to 1.0mm, and the W3+W4 is more than or equal to 0.3mm. Further, when 0.3 mm.ltoreq.W3+W4.ltoreq.1.0 mm, W2 or W5 is optionally larger than or equal to 0.4mm, and when 0.4 mm.ltoreq.W3+W4.ltoreq.0.7 mm, W2 or W5 is optionally larger than or equal to 0.5mm. In a specific embodiment, W2 or w5=0.4 mm, w3=0.42 mm, w4=0.45 mm, h=0.55 mm.

Referring to fig. 7 and 5, in the vibration direction of the transducer 12, a distance from a connection point (e.g., point 7A) between the fold portion 133 and the first connection portion 132 to an outer end surface of the magnetic circuit 122 away from the front cavity 111 may be defined as d1, and a distance from a central region of the spring piece 124 to an outer end surface of the magnetic circuit 122 away from the front cavity 111 may be defined as d2, where 0.3+.d1/d2+.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 pleat 133 is connected to the first connection 132. Further, the distance from the geometric center of the magnet 1222 (e.g., point G) to the outer end surface of the magnetic circuit 122 remote from the front cavity 111 may be defined as d3, where 0.7.ltoreq.d1/d3.ltoreq.2. At this time, since the size of the distance d3 may be relatively determined, the size of the distance d1 may also be adjusted based on the distance d3 so as to adjust a specific position where the pleat 133 is connected to the first connection 132. Thus, one end of the magnetic circuit 122 may be connected to the core housing 11 through the spring plate 124 and the coil support 121, and the other end may be connected to the core housing 11 through the diaphragm 13, that is, the spring plate 124 and the diaphragm 13 may fix the two ends of the magnetic circuit 122 on the core housing 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 to combine with FIG. 2 in the vibration direction of the transducer assembly 12, the sound outlet 113 may be located at least partially between the connection point and the outer end face. In this way, while the stability of the magnetic circuit 122 is increased as much as possible, a sufficient size can be set for the volume of the rear cavity 112 as much as possible to increase the acoustic expressive force of the deck module 10, and a sufficient design space can be set for the position of the sound hole 113 on the deck housing 11 and the size thereof as much as possible, so as to flexibly set the sound hole 113.

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

Further, the distance between the projections of 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, respectively, in the vibration direction of the transducer 12 may be defined as d4, where 0.ltoreq.d4/w2.ltoreq.1.8. At this time, the specific position where the fold portion 133 is connected to the first connection portion 132 can be adjusted as well. In fig. 6 (a) or (c), the connection point between the first connection portion 132 and the fold portion 133 and the connection point between the second connection portion 134 and the fold portion 133 may overlap in projection in the vibration direction of the transducer 12, that is, d4=0. Of course, in connection with fig. 6 (B) or (d), the connection point between the first connection portion 132 and the folded portion 133 (e.g., point 7A) and the connection point between the second connection portion 134 and the folded portion 133 (e.g., point 7B) may be offset from each other in projection in the vibration direction of the transducer 12, that is, d4>0, respectively.

Referring to fig. 8 and 2, the deck module 10 may further include an acoustic guide member 14 connected to the deck housing 11. Wherein the sound guide member 14 is provided with a sound guide passage 141, and the sound guide passage 141 communicates with the sound outlet 113 and guides the air sound to the human ear. In other words, the sound guide member 14 may be used to change the propagation path/direction of the air guide sound and thus the directivity of the air guide sound, and may be used to shorten the distance between the sound outlet 113 and the human ear and thus increase the strength of the air guide sound. In addition, the sound guiding member 14 may further deviate the sound guiding from the actual output position of the earphone 100 from the rear end surface of the deck 11 opposite to the skin contact area thereof (for example, the area where the rear bottom plate 1151 is located), so as to improve the anti-phase cancellation of the sound at the sound outlet 113 caused by the possible leakage sound at the rear bottom plate 1151. In this way, so that the user can better hear the aforementioned air guide sound when the user wears the earphone 100.

Generally, to ensure sound quality, the response of the frequency response is relatively flat over a wide frequency band, i.e. the resonance peak is required to be as high as possible. The frequency response curve of the air-guide 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 1kHz, preferably, the peak resonance frequency may be greater than or equal to 2kHz, so that the earphone 100 has a better sound output effect, more preferably, the peak resonance frequency may be greater than or equal to 3.5kHz, so that the earphone 100 has a better music output effect, and further, the peak resonance frequency may be 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 113, and may constitute a typical helmholtz resonator structure. Based on the Helmholtz resonant cavity model, the relation formula of f-oc [ S/(VL+1.7VR) ] ^1/2 can be satisfied between the resonant frequency f and the volume V of the rear cavity 112, the sectional area S of the sound guide channel 141, the equivalent radius R and the length L thereof. It is apparent that in the case that the volume of the rear cavity 112 is constant, increasing the cross-sectional area of the sound guide channel 141 and/or decreasing the length of the sound guide channel 141 are advantageous to increase the resonance frequency, thereby moving the above-mentioned sound guide as high frequency as possible.

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 guiding channel 141 may be between 2mm and 5 mm. Wherein, in the vibration direction of the transducer device 12, the distance between the outlet end of the sound guiding channel 141 and the rear end surface of the cartridge case 11 facing away from the skin contact area may be greater than or equal to 3mm, whereby the anti-phase cancellation of the air guiding sound of the outlet end of the sound guiding channel 141 by the leakage sound generated by the rear end surface of the cartridge case 11 can be avoided.

As an example, the cross-sectional area of the sound guiding channel 141 may be greater than or equal to 4.8mm ². Preferably, the cross-sectional area of the sound guiding channel 141 may be greater than or equal to 8mm ². Further, in connection with fig. 2, the cross-sectional area of the sound guiding channel 141 may be gradually increased in the transmission direction of the air-guide sound (i.e., in a direction away from the sound outlet 113), so that the sound guiding channel 141 may be provided in a horn shape and may extend toward the front case 116 in order to guide the air-guide 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, or the cross-sectional area of the outlet end of the sound guiding channel 141 may be greater than or equal to 15mm ².

As an example, the ratio between the volume of the sound guiding channel 141 and the volume of the 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 and 400mm ³.

In a specific embodiment, the sound guide channel 141 may be configured to have a horn shape. The length of the sound guiding channel 141 may be 2.5mm, and the cross-sectional areas of the inlet end and the outlet end of the sound guiding channel 141 may be 15mm ²、25.3mm², respectively. Further, the volume of the rear cavity 112 may be 350mm ³.

Referring to fig. 8, various structural modifications of the sound guide 14 are mainly illustrated in fig. 8 (a) to (e), and the main difference therebetween is the specific structure of the sound guide channel 141. The sound guiding channels 141 can be simply considered as a bent arrangement for fig. 8 (a) to (c), and the sound guiding channels 141 can be simply considered as a straight-through arrangement for fig. 8 (d) to (e). Obviously, the above-mentioned air guide sound may have a certain difference according to the structural difference of the sound guide channel 141, specifically:

in fig. 8 (a), the sound emission 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 emission direction of the sound guide channel 141 is directed to the auricle of the user, so that the above-mentioned air guide sound is more easily collected by the auricle into the auditory canal, thereby optimizing the intensity of the above-mentioned air guide sound.

In fig. 8 (c), the sound emission direction of the sound guide channel 141 is also directed to the auditory canal of the user, and the intensity of the air guide sound can be optimized. Meanwhile, the outlet end of the sound guiding channel 141 adopts an inclined outlet mode, and the inclined outlet enables the actual area of the outlet end of the sound guiding channel 141 not to be limited by the cross-sectional area of the sound guiding channel 141, which is equivalent to increasing the cross-sectional area of the sound guiding channel 141, thereby being beneficial to the output of the air sound.

In fig. 8 (d), the wall surface of the sound guiding channel 141 is a plane, which is convenient for demolding during the manufacturing process.

In fig. 8 (e), the wall surface of the sound guiding channel 141 is curved, which is advantageous for realizing acoustic impedance matching between the sound guiding channel 141 and the atmosphere, and thus for outputting the air-guided sound.

The cross-sectional area of a certain point of the sound guiding channel 141 refers to the smallest area that can be intercepted when the sound guiding channel 141 is intercepted by the certain point. Further, the through-type sound guide channel means that all of the other can be observed from either one of the inlet end and the outlet end of the sound guide channel 141. At this time, for the through-type sound guide channel shown in, for example, fig. 8 (d) to (e), the length of the sound guide channel 141 can be calculated by determining the geometric center of the inlet end of the sound guide channel 141 (e.g., point 8A) and the geometric center of the outlet end thereof (e.g., point 8B) and then connecting the geometric centers to form the line segments 8A-8B, the length of which can be simply regarded as the length of the sound guide channel 141. Accordingly, the folded sound guide channel means that the other one is not observed or only a part of the other one can be observed from either one of the inlet end and the outlet end of the sound guide channel 141. At this time, for example, as for the folded sound guide channels shown in fig. 8 (a) to (c), it is possible to divide the folded sound guide channel into two or more through sub-guide channels, and take the sum of the lengths of the through sub-guide channels as the length of the folded sound guide channel. For example, in fig. 8 (a) to (C), the geometric center (e.g., points 8C1, 8C 2) of the face where the middle bend is located is 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.

Referring 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 regulate the acoustic resistance of the air-guiding sound output to the exterior of the earphone 100 through the sound outlet 113, so as to weaken the peak resonance frequency of the resonance peak of the air-guiding sound in the middle-high frequency band or the high frequency band, so that the frequency response curve is smoother, the listening effect is better, and the rear cavity 112 can be separated from the exterior to a certain extent, so as to increase the waterproof and dustproof performances of the movement module 10. Wherein the acoustic resistance of the acoustic resistance mesh 140 may be less than or equal to 260MKSrayls. Specifically, the porosity of the acoustic resistive mesh 140 may be greater than or equal to 13%, and/or the pore size may be greater than or equal to 18 μm.

Illustratively, in connection with fig. 9, the acoustic resistive mesh 140 may be woven from mesh strands, with the wire diameter, degree of density, etc. of the mesh strands affecting the acoustic resistance of the acoustic resistive mesh 140. Based on the above, every four mutually intersected gauze wires in the plurality of gauze wires which are longitudinally and transversely arranged at intervals can be surrounded to form a pore. The area of the area surrounded by the central line of the gauze can be defined as S1, the area of the area (namely the pore) practically surrounded by the edge of the gauze can be defined as S2, and then the porosity can be defined as S2/S1. Further, the pore size may be expressed as the spacing between any two adjacent strands, such as the side length of the pore.

Further, the effective area of a particular through-hole or opening introduced below in the present application may be defined as the product of its actual area and the porosity of the covered acoustic resistive mesh. For example, when the outlet end cap of the sound guide channel 141 is provided with the acoustic resistive 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 resistive mesh 140, and when the outlet end of the sound guide channel 141 is not covered with the acoustic resistive mesh 140, the effective area of the outlet end of the sound guide channel 141 is the actual area of the outlet end of the sound guide channel 141. Similarly, the effective areas of the outlet ends of the through holes such as the pressure relief holes and the sound adjusting holes can be defined as the product of the actual area and the corresponding porosity, and will not be described herein.

Based on the above-described related description, the user mainly hears the air guide sound outputted to the outside of the earphone 100 through the sound outlet 113 and the sound guide channel 141, in addition to the bone guide sound, instead of the air guide sound outputted to the outside of the earphone 100 through the pressure release hole 114. Accordingly, the effective area of the outlet end of the sound guide channel 141 may be designed to be larger than that of the pressure release hole 114.

Further, the size of the pressure release hole 114 affects the smoothness of the exhaust of the front cavity 111, affects the difficulty of the vibration of the diaphragm 13, and further affects the acoustic expressive force of the air guide sound output to the outside of the earphone 100 through the sound output hole 113. Therefore, in the case where the effective area of the outlet end of the sound guide channel 141 is fixed, for example, the actual area of the outlet end of the sound guide channel 141 and/or the porosity of the acoustic resistive mesh 140 is fixed, in combination with the following table, adjusting the effective area of the outlet end of the pressure relief hole 114, for example, the actual area of the outlet end of the pressure relief hole 114 and/or the acoustic resistance of the acoustic resistive mesh 1140 overlaid thereon, can change the air sound guide output to the outside of the earphone 100 through the sound outlet hole 113. Wherein, the acoustic resistance of the application is 0, which can be simply regarded as that an acoustic resistance net is arranged without a cover.

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

With reference to fig. 10, as the actual area of the outlet end of the pressure relief hole 114 increases, the exhaust of the front cavity 111 becomes smoother, the peak resonance intensity of the low frequency band or the middle-low frequency band increases significantly, and as the acoustic resistive net 1140 is added to 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 guide sound output to the outside of the earphone 100 through the sound output hole 113 decreases, and the frequency response curve is relatively flat.

By combining the following table, the combination of the pressure relief holes 114 with the acoustic resistance nets 1140 with different acoustic resistances can be realized by adjusting the actual area of the outlet end of the pressure relief hole 114 and the acoustic resistance net 1140 covered on the pressure relief hole, so that the frequency response curve of the air sound output to the outside of the earphone 100 through the sound outlet hole 113 is substantially consistent. Wherein if the acoustic resistive mesh 1140 with a porosity of 14% can be simply considered a single layer mesh, the acoustic resistive mesh 1140 with 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, the larger the acoustic resistance of the acoustic resistance mesh corresponding to the actual area of the outlet end of the pressure relief hole 114 should be, so that the effective area of the outlet end of the pressure relief hole 114 can be kept substantially uniform, the exhaust smoothness of the front cavity 111 is substantially the same, and the frequency response curve of the air sound output to the outside of the earphone 100 through the sound output hole 113 is further substantially uniform. However, in connection with fig. 12, although the frequency response curve of the air-guide sound outputted to the outside of the earphone 100 through the sound outlet 113 is substantially uniform, the frequency response curve of the air-guide sound outputted to the outside of the earphone 100 through the pressure release hole 114 is different, that is, the leakage sound at the pressure release 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 leakage sound at the pressure relief hole 114 is weakened. In other words, while ensuring that the frequency response curve of the air conduction sound at the sound conduction member 14 is substantially unchanged, the size of the pressure relief hole 114 can be increased as much as possible, and at the same time, the acoustic resistance of the acoustic resistive mesh 1140 on the pressure relief hole 114 can be increased so that the leakage sound at the pressure relief hole 114 is as small as possible. It can be seen that the leakage sound at the pressure relief holes 114 can be reduced by increasing the actual area of the outlet ends of the pressure relief holes 114 and the porosity of the acoustic resistive mesh 1140, while ensuring that the effective area of the outlet ends of the pressure relief holes 114 is less than or equal to 2.76mm ².

It should be noted that, due to the limited size of the deck housing 11, the single pressure relief hole 114 cannot be too large. Based on this, the pressure relief holes 114 may be provided in at least one or at least two, for example, three as described below.

Based on the above detailed description, the effective area of the outlet end of the sound guide channel 141 may be larger than that of the outlet end of each pressure release hole 114, so that the user hears the air guide sound outputted to the outside of the earphone 100 through the sound output hole 113. Wherein, based on the definition of the effective area, the actual area of the outlet end of the sound guiding 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 the sound guide channel 141 may be greater than or equal to the sum of the effective areas of the outlet ends of all the pressure relief holes 114. Wherein the ratio between the sum of the effective areas of the outlet ends of all the pressure relief holes 114 and the effective area of the outlet end of the sound guide channel 141 may be greater than or equal to 0.15. As an example, the effective area of the outlet end of the full pressure relief aperture 114 may be greater than or equal to 2.5mm ². In this way, the exhaust of the front cavity 111 is ensured to be smooth, so that the acoustic expressive force of the air guide sound output to the outside of the earphone 100 through the sound outlet 113 is improved, and the leakage sound at the pressure release hole 114 is reduced.

As an example, the actual area of the outlet end of the sound guiding channel 141 may be greater than or equal to 4.8mm ². Preferably, the actual area of the outlet end of the 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 relief holes 114 may be greater than or equal to 2.6mm ². Preferably, the actual area of the outlet ends of all of the 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 the actual area of the outlet end of one pressure relief hole 114, and the sound adjusting holes 117 are similar. In a specific embodiment, the actual area of the outlet end of the sound guiding channel 141 may be 25.3mm ², and the three pressure relief holes 114 may be provided, for example, the first pressure relief hole 1141, the second pressure relief hole 1142, and the third pressure relief hole 1143 mentioned later, and the actual area of the outlet end may be 11.4mm ²、8.4mm²、5.8mm², respectively.

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

Based on the above description, the sound guide channel 141 communicates with the rear cavity 112 through the sound outlet 113, and may form a typical helmholtz resonator structure and have a resonance peak. We can study the distribution of sound pressure in the back volume 112 as the helmholtz resonator structure resonates. In fig. 13 (a), a high-pressure area far from the sound outlet 113 and a low-pressure area near the sound outlet 113 are formed in the rear cavity 112. Further, when the helmholtz resonator structure resonates, it can be considered that a standing wave occurs in the rear chamber 112. The wavelength of the standing wave corresponds to the size of the rear cavity 112, for example, the deeper the rear cavity 112, that is, 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 resonator structure. In view of this, in fig. 13 (b), by destroying the high-voltage region, for example, by providing a through hole communicating with the rear cavity 112 in the high-voltage region, the sound originally reflected in the high-voltage region cannot be reflected, and the standing wave cannot be formed. At this time, when the helmholtz resonator structure resonates, the high pressure area in the rear cavity 112 moves inward toward the direction close to the low pressure area, so that the wavelength of the standing wave becomes short, and the resonance frequency of the helmholtz resonator structure is improved.

Referring to fig. 2, deck housing 11 may also be provided with a sound adjustment aperture 117 in communication with rear cavity 112. Under the same conditions, the sound adjusting hole 117 is arranged in the high-pressure area in the rear cavity 112, so that the high-pressure area can be damaged most effectively. Of course, the tuning hole 117 may be located in any region between the high pressure region and the low pressure region in the rear chamber 112. As an example, the sound adjusting hole 117 may be provided in the rear housing 115, and may be provided at both sides of the transducer device 12 opposite to the sound outlet hole 113 and the sound guiding member 14 thereof.

Further, referring to fig. 14, the frequency response curve of the air-guide sound outputted to the outside of the earphone 100 through the sound outlet 113 has a resonance peak. By combining the following table, the actual area of the outlet end of the sound adjusting hole 117 is adjusted without covering the acoustic resistive net, so that the damage degree of the sound adjusting hole to the high-voltage area can be controlled, and the peak resonance frequency of the resonance peak can be adjusted. Wherein an actual area of 0 at the outlet end of the tuning hole 117 may be regarded as the tuning hole 117 being in a closed state.

Referring to fig. 14, the larger the actual area of the outlet end of the tuning hole 117, the more remarkable the damage effect on the high-voltage region is, and the higher the peak resonance frequency of the resonance peak is. Wherein, the peak resonance frequency of the resonance peak when the tuning hole 117 is in the open state is shifted to a higher frequency than the peak resonance frequency of the resonance peak when the tuning 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 sound adjusting hole 117 is in the open state may be greater than or equal to 2kHz, so that the earphone 100 has a better voice output effect. Preferably, the peak resonance frequency may be greater than or equal to 3.5kHz, so that the earphone 100 has a better music output effect, and the peak resonance frequency may be further greater than or equal to 4.5kHz.

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

Similarly, the user hears not only bone conduction but also air conduction output to the outside of the earphone 100 through the sound outlet 113, not air conduction output to the outside of the earphone 100 through the sound outlet 117. Accordingly, the effective area of the outlet end of the sound guide channel 141 may be designed to be larger than that of the sound adjusting hole 117.

Referring to fig. 14 and 13, since the sound adjusting hole 117 is added to the rear cavity 112, a part of sound leaks from the sound adjusting hole 117, that is, a leakage sound is formed at the sound adjusting hole 117, so that the frequency response curve of the air-guide sound outputted to the outside of the earphone 100 through the sound outlet 113 moves down as a whole. To this end, in connection with fig. 2, at least part of the outlet end of the tuning orifice 117 may be capped with an acoustically resistive mesh 1170 to avoid leakage of sound from the tuning orifice 117 as much as possible while destroying the high pressure region within the back volume 112. Wherein, in combination with the following table, adjusting the effective area of the outlet end of the sound adjusting hole 117, for example, the actual area of the outlet end of the sound adjusting hole 117 and/or the acoustic resistance of the acoustic resistance net 1170 covered thereon, can change the air sound outputted to the outside of the earphone 100 through the sound outlet 113.

Frequency response curve	Acoustic resistance/MKSrayls
		15-1	Sound hole without tone
15-2	0
		15-3	145

With reference to fig. 15, the acoustic resistance net 1170 is added at the outlet end of the sound adjusting hole 117, so that it can be ensured that no significant reflected sound (i.e. no standing wave or non-hard sound field boundary) exists in the rear cavity 112 at the sound adjusting hole 117, so that the high-pressure area in the rear cavity 112 is moved inwards, and the sound can be prevented from leaking out from the sound adjusting hole 117 to a certain extent, so that the sound can be output to the outside of the earphone 100 through the sound outlet 113. Further, the peak resonance intensity of the middle-low frequency band is obviously increased, the volume of the air guide sound is increased, and the peak resonance intensity of the high frequency band is also reduced to a certain extent, so that the frequency response curve is flatter in the high frequency band, and the tone quality of the high frequency is more balanced.

Based on the above detailed description, the effective area of the outlet end of the sound guide channel 141 may be larger than that of the outlet end of each sound adjusting hole 117 so that the user hears 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 guiding channel 141 may be larger than the actual area of the outlet end of each sound adjusting hole 117. Further, the effective area of the outlet end of the sound guide channel 141 may be larger than the sum of the effective areas of the outlet ends of all the sound adjusting holes 117. Wherein the ratio between the sum of the effective areas of the outlet ends of all the sound adjusting 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. As an example, the sum of the effective areas of the outlet ends of all sound-tuning holes 117 may be greater than or equal to 1.5mm ². When the number of the sound adjusting holes 117 is one, the sum of the effective areas of the outlet ends of all the sound adjusting holes 117 is the effective area of the outlet end of one sound adjusting hole 117, and the pressure release holes 114 are similar. In this way, the peak resonance frequency of the resonance peak of the air-guide sound outputted to the outside of the earphone 100 through the sound outlet 113 can be shifted to a high frequency as much as possible, and the leakage sound at the sound adjusting hole 117 can be reduced.

As an example, the sum of the actual areas of the outlet ends of all sound-tuning holes 117 may be greater than or equal to 5.6mm ². In a specific embodiment, two sound adjusting holes 117 may be provided, for example, a first sound adjusting hole 1171 and a second sound adjusting hole 1172 mentioned later, and the actual area of the outlet ends may be 7.6mm ²、5.6mm² respectively.

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

Based on the above-mentioned related description, for the pressure release hole 114 and the sound outlet hole 113, the phases of the air conduction sounds respectively output to the outside of the earphone 100 through the two are opposite, so that the pressure release hole 114 and the sound outlet hole 113 should be staggered as much as possible in the three-dimensional space, so as to avoid coherent cancellation of the air conduction sounds respectively output to the outside of the earphone 100 through the two. For this reason, the pressure release hole 114 is as far away from the sound outlet hole 113 as possible. For the sound adjusting hole 117 and the sound outlet 113, if the area of the sound outlet 113 can be simply regarded as a low pressure area in the rear cavity 112, the area of the rear cavity 112 farthest from the area of the sound outlet 113 can be simply regarded as a high pressure area in the rear cavity 112, and the sound adjusting hole 117 may be preferably arranged in the high pressure area in the rear cavity 112 to destroy the original high pressure area and move it toward the low pressure area. For this reason, the tuning hole 117 is as far away from the sound outlet 113 as possible.

Further, since the pressure release hole 114 communicates with the front cavity 111 and the sound adjusting hole 117 communicates with the rear cavity 112, the phases of the air-guide sounds output to the outside of the earphone 100 through the pressure release hole 114 and the sound adjusting hole 117 are opposite, respectively, so that the leakage sounds from the pressure release hole 114 and the sound adjusting hole 117 can be reduced by coherent cancellation. Based on this, at least a portion of the pressure relief holes 114 and at least a portion of the sound tuning holes 117 may be disposed adjacent to each other, respectively, to provide for coherent cancellation. Wherein, in order to better make the leakage sound coherence of the pressure relief hole 114 and the sound adjusting hole 117 cancel, 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 peak resonance intensity of the resonance peak of the air conduction sound outputted to the outside of the earphone 100 through the pressure release hole 114 and the sound adjusting hole 117, respectively, should be matched as much as possible. However, in practical product design, it is generally difficult to control the peak resonance frequencies and/or peak resonance intensities of the resonance peaks of the two air conduction sounds to be exactly the same under the influence of specific structures and process tolerances, so that the peak resonance frequencies and/or peak resonance intensities of the resonance peaks of the two air conduction sounds should be ensured not to be excessively different in design.

Referring to fig. 16, the frequency response curve of the air-guide sound outputted to the outside of the earphone 100 through the pressure release hole 114 has a first resonance peak f1, and the frequency response curve of the air-guide sound outputted to the outside of the earphone 100 through the sound adjustment hole 117 has a second resonance peak f2. Wherein, in combination with the following table, the peak resonance frequency of the first resonance peak and the peak resonance frequency of the second resonance peak may be greater than or equal to 2kHz, respectively, and |f1-f2|/f1 is less than or equal to 60%. As the difference between the peak resonance frequency of the first resonance peak and the peak resonance frequency of the second resonance peak gradually decreases, the wider the bandwidth capable of reducing the leakage sound, that is, the flatter the frequency response curve becomes, the smaller the leakage sound of the earphone 100 becomes, that is, the better the effect of air conduction acoustic coherence cancellation output to the outside of the earphone 100 through the pressure release hole 114 and the acoustic adjustment hole 117 respectively becomes. Preferably, the peak resonance frequency of the first resonance peak and the peak resonance frequency of the second resonance peak may be greater than or equal to 3.5k, respectively, and |f1-f2|+.2kHz. In this way, the air conduction sound output to the outside of the earphone 100 through the pressure release hole 114 and the sound adjustment hole 117 is coherently cancelled as much as possible in the high frequency band.

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 the front cavity 111 is provided with the coil support 121, the spring piece 124 and other structural members, the wavelength of the standing wave in the front cavity 111 is relatively longer, and the sound adjusting hole 117 and the sound outlet 113 can destroy the high-voltage area, so that the wavelength of the standing wave in the rear cavity 112 is relatively shorter. 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 enable better coherent cancellation of the air conduction sound output to the outside of the earphone 100 via the pressure relief hole 114 and the sound adjusting hole 117, respectively, the peak resonance frequency of the first resonance peak should be shifted as much as possible towards a high frequency to be 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 in the adjacently disposed pressure relief hole 114 and sound adjusting hole 117 may be larger than the effective area of the outlet end of the sound adjusting hole 117. Wherein, the ratio between the effective area of the outlet end of the pressure relief hole 114 and 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 adjacent disposed pressure relief hole 114 and sound adjusting hole 117 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 vent 114 may include a first pressure relief vent 1141 and a second pressure relief vent 1142. The first pressure release hole 1141 may be disposed further from the sound outlet 113 than the second pressure release hole 1142. At this time, 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 second pressure relief hole 1142. In this way, the size of the movement housing 11 and the exhaust requirement of the front cavity 111 can be considered, and the first pressure release hole 1141 with relatively large exhaust capacity can be far away from the sound outlet 113 as far as possible, so as to reduce the influence of the sound leakage at the pressure release hole 114 on the air sound guide at the sound outlet 113. Further, the pressure relief hole 114 may further include a third pressure relief hole 1143, and the first pressure relief hole 1141 may be further away from the sound emitting hole 113 than the third pressure relief hole 1143. The effective area of the outlet end of the second pressure release hole 1142 may be greater than the effective area of the outlet end of the third pressure release hole 1143.

As an example, referring to fig. 17 (a) and 2, the sound outlet 113 and the first pressure release hole 1141 may be located at opposite sides of the transducer 12, and the second pressure release hole 1142 and the third pressure release hole 1143 may be located opposite to each other and may be located between the sound outlet 113 and the first pressure release hole 1141.

Further, at least a portion of the outlet end of the pressure relief vent 114 may be covered with an acoustically resistive mesh 1140 to facilitate adjusting the effective area of the outlet end of the pressure relief vent 114. In this embodiment, the outlet ends of the pressure relief holes 114 are respectively covered with an acoustic resistive net 1140 with the same acoustic resistance. Thus, not only the acoustic performance and the waterproof and dustproof performance of the earphone 100 can be improved, but also the mixing of the acoustic resistive mesh 1140 due to the excessive 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 a 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 be larger than the actual area of the outlet end of the third pressure relief hole 1143.

Referring to fig. 17 (b), the tuning holes 117 may include a first tuning hole 1171 and a second tuning hole 1172. Wherein the first tuning hole 1171 may be disposed further from the sound outlet 113 than the second tuning hole 1172. At this time, the effective area of the outlet end of the first sound adjusting hole 1171 may be larger than the effective area of the outlet end of the second sound adjusting hole 1172 so as to destroy the high pressure region in the rear chamber 112. In this way, the size of the deck housing 11 and the requirement of the sound adjusting hole 117 to destroy the high-pressure area of the rear cavity 112 can be both considered, and the resonance frequency of the air guide sound at the sound outlet 113 can be as high as possible, and the first sound adjusting hole 1171 with relatively large destruction degree can be far away from the sound outlet 113 as far as possible.

As an example, in connection with fig. 17 (b) and 2, the sound outlet 113 and the first sound regulating hole 1171 may be located at opposite sides of the transduction device 12, and the second sound regulating hole 1172 may be located between the sound outlet 113 and the first sound regulating hole 1171.

Further, at least a portion of the outlet end cap of the tuning orifice 117 may be provided with an acoustically resistive mesh 1170 to facilitate adjusting the effective area of the outlet end of the tuning orifice 117. In this embodiment, the acoustic resistance net 1170 with the same acoustic resistance is respectively covered at the outlet end of the sound adjusting hole 117. Thus, not only the acoustic performance and the waterproof and dustproof performance of the earphone 100 can be improved, but also the mixing of the acoustic resistive net 1170 due to the excessive specification types can be avoided. Based on this, the actual area of the outlet end of the sound adjusting hole 117 is adjusted to obtain a corresponding effective area. For example, the actual area of the outlet end of the first tuning orifice 1171 may be greater than the actual area of the outlet end of the second tuning orifice 1172. Specifically, the actual area of the outlet end of the first tuning orifice 1171 may be greater than or equal to 3.8mm ², and/or the actual area of the outlet end of the second tuning orifice 1172 may be greater than or equal to 2.8mm ².

As an example, in conjunction with (c) and (d) in fig. 17, 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 release hole 1141 and the first sound adjusting hole 1171 can be coherently cancelled, and the air conduction sound output to the outside of the earphone 100 through the second pressure release hole 1142 and the second sound adjusting hole 1172 can be coherently cancelled.

Further, the effective area of the outlet end of the first pressure release hole 1141 may be larger than the effective area of the outlet end of the first sound adjusting hole 1171, so that the peak resonance frequency of the air conduction sound output to the outside of the earphone 100 through the first pressure release hole 1141 is shifted to a high frequency as much as possible, so as to be as close to the peak resonance frequency of the air conduction sound output to the outside of the earphone 100 through the first sound adjusting hole 1171 as much as possible, and further, the air conduction sound output to the outside of the earphone 100 through the first pressure release hole 1141 and the first sound adjusting 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 adjusting hole 1172, which is not described herein.

Similar to the destruction of the high-voltage region in the rear cavity 112 by the sound adjusting hole 117, the second pressure relief hole 1142 and the third pressure relief hole 1143 destroy the high-voltage 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 resonance frequency of the air conduction sound output to the outside of the earphone 100 through the first pressure relief hole 1141 can shift to the high-frequency offset, so as to better coherently cancel the air conduction sound output to the outside of the earphone 100 through the first sound adjusting hole 1171. Wherein the offset may be greater than or equal to 500Hz and the peak resonance frequency of the resonance peak may 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 guide sound output to the outside of the earphone 100 via the second pressure release hole 1142 can also be shifted toward a high frequency. In short, the frequency response curve of the air-guide sound outputted to the outside of the earphone 100 through the pressure release hole 114 provided adjacent to the sound adjustment hole 117 has a resonance peak, and the peak resonance frequency of the resonance peak when the pressure release hole 114 other than the pressure release hole 114 provided adjacent to the sound adjustment hole 117 is in the open state is shifted to a higher frequency than the peak resonance frequency of the resonance peak when the pressure release hole 114 other than the pressure release hole 114 is in the closed state. Wherein the peak resonance frequency of the resonance 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, cartridge case 11 may include first and second sidewalls 17A and 17B at opposite sides of transduction device 12, and third and fourth sidewalls 17C and 17D connecting first and second sidewalls 17A and 17B and spaced apart from each other. In short, the deck 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 case 11 is disposed in a racetrack shape as a whole. Wherein the first side wall 17A is closer to the human ear than the second side wall 17B, and the third side wall 17C is closer to the ear-hook component 20 than the fourth side wall 17D. Further, the sound outlet 113 may be disposed on the first side wall 17A, so that the user can hear the air sound outputted to the outside of the earphone 100 through the sound outlet 113 and the sound guiding channel 141, and the first pressure release hole 1141 and the first sound adjusting hole 1171 may 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 sound adjusting hole 1172 may be respectively disposed on one of the third side wall 17C and the fourth side wall 17D, and the third pressure relief hole 1143 may be disposed on the other of the third side wall 17C and the fourth side wall 17D.

Based on the above-described related description, and in conjunction with fig. 18 (a), the air in the front cavity 111 needs to be exhausted by-passing the coil assembly, and its path may be as indicated by the dotted arrow in fig. 18 (a), resulting in a relatively long wavelength of the standing wave in the front cavity 111, which is disadvantageous in that the peak resonance frequency of the air guide sound output to the outside of the earphone 100 through the pressure relief hole 114 is shifted to a high frequency. For this reason, the communication hole 1215 is formed on the coil assembly in this embodiment, so that the air in the front cavity 111 can directly pass through the coil assembly during the exhausting process, and in combination with fig. 18 (b), not only the exhausting efficiency of 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 resonance frequency of the air guiding sound outputted to the outside of the earphone 100 through the pressure release hole 114 is shifted to high frequency.

Referring to fig. 19, the frequency response curve of the air-guide sound outputted to the outside of the earphone 100 through the pressure release hole 114 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 higher frequency than 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, the peak resonance frequency of the resonance peak when the communication hole 1215 is in the open state may be greater than or equal to 2kHz.

Illustratively, the coil assembly is disposed within the front cavity 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 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-described related description, and with reference to fig. 5, the coil assembly according to the present embodiment may include a coil bracket 121 and a coil 123 connected to the coil bracket 121, where the coil bracket 121 is used to fix the coil 123 to the deck housing 11, and make the coil 123 extend into a magnetic gap of the magnetic circuit 122. Here, the communication hole 1215 may be provided to the coil bracket 121. Further, the communication hole 1215 may be located at a side of the spring piece 124 facing away from the above-described skin contact area to shorten the path of air discharge in the front cavity 111 as much as possible.

Referring to fig. 20, a communication hole 1215 may be located at a junction between the annular main body portion 1211 and the first cylindrical holder portion 1212. Of course, all of the communication holes 1215 may be located in the annular main body portion 1211 or the first cylindrical holder portion 1212. Further, the number of the communication holes 1215 may be plural, and disposed at intervals in the circumferential direction of the coil assembly. Wherein the cross-sectional area of each communication hole 1215 may be greater than or equal to 2mm ². As an example, the cross-sectional area of the communication hole 1215 disposed adjacent to the first pressure release hole 1141 may be greater than or equal to 3mm ², and the cross-sectional area of the communication hole 1215 disposed adjacent to the second pressure release hole 1142 and the third pressure release hole 1143, respectively, may be greater than or equal to 2.5mm ².

Based on the above-described related description, the air vibration in the front and rear chambers 111 and 112 is reversed. Based on this, the deck module 10 may further include a communication channel that communicates the front cavity 111 and the rear cavity 112, so as to destroy the high-voltage areas in the front cavity 111 and the rear cavity 112, and improve the peak resonance frequency of the resonance peak, thereby improving the sound quality and the leakage of the earphone 100.

As an example, in connection with fig. 21 (a), the communication passage may be a micropore array 21A provided to the diaphragm 13, for example, the micropore array 21A is provided to the wrinkle part 133. Wherein at least some of the micro-holes in the array of micro-holes 21A and the sound outlet 113 may be located on opposite sides of the transducer means 12, respectively. Of course, the micropore array 21A may be provided on both sides of the sound emitting hole 113. Further, the actual area of each microwell in microwell array 21A may be between 0.01mm ² and 0.04mm ².

Further, the micropore array 21A may also cooperate with the sound adjusting holes 117 so as to shift the air-guide sound output to the outside of the earphone 100 via the sound outlet holes 113 toward a high frequency.

Referring to fig. 22 and the table below, the frequency response curve of the air-guide 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. The peak resonance frequency of the resonance peak when the communication channel is in the open state is shifted to a higher frequency than the peak resonance 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, as the peak resonance frequency of the resonance peak shifts to a high frequency, the leakage sound in the middle and low frequency bands is gradually reduced, as shown in fig. 23.

Further, an acoustic resistance mesh 21D may be provided on the communication path defined by the communication passage. In addition, with reference to fig. 24 and the table below, by providing the acoustic resistive screen 21D, the high frequency peak in the air-guide sound outputted to the outside of the earphone 100 through the sound outlet 113 and the sound guide channel 141 can be further weakened, so that the frequency response curve is flatter and the high frequency sound quality is more balanced. Illustratively, the acoustic resistive mesh 21D may have a porosity of less than or equal to 18%, and/or a pore size of less than or equal to 51 μm.

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

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

As an example, in connection with fig. 21 (C), the communication passage may be a communication pipe 21C provided outside the deck housing 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 disposed adjacently.

Based on the above-described related description, the front cavity 111 and the rear cavity 112 may 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 114, and the sound adjusting 117 has a resonance peak, respectively. Any of the above embodiments mainly shifts the peak resonance frequency of the resonance peak to a high frequency so as to improve the sound quality and leakage of the earphone 100. Further, the peak resonance intensity of the air guide sound at the resonance peak increases drastically, resulting in an unbalanced sound quality. To this end, movement module 10 may further include a helmholtz resonator 25A in communication with front and/or rear chambers 111, 112 to facilitate absorption of acoustic energy of front and/or rear chambers 111, 112 near the peak resonance frequency, i.e., to suppress sudden increases in peak resonance intensity, resulting in a flatter frequency response curve and, in turn, a more balanced sound quality.

As an example, in connection with fig. 25 (a), the helmholtz resonator 25A may be provided to the cartridge case 11, for example, opposite to the skin contact area of the cartridge case 11.

As an example, in conjunction with (b) to (d) in fig. 25, the helmholtz resonator 25A may be provided to the magnetic circuit 122, for example, to the magnet 1222. The mass of the magnetic circuit 122 is larger than that of the cartridge case 11, so that the amplitude of the magnetic circuit 122 is smaller under the same driving force, especially in the middle-high frequency band (e.g., >1 kHz). In other words, during actual operation of the earphone 100, the vibration of the magnetic circuit 122 is significantly smaller than that of the deck 11. Based on this, the helmholtz resonator 25A is provided in the magnetic circuit 122, so that a wall surface with smaller vibration can be obtained, which absorbs acoustic energy and has a more remarkable effect of attenuating high frequency peaks.

Based on the helmholtz cavity model, and in conjunction with fig. 26, as the volume of the helmholtz resonator 25A (e.g., C in fig. 26) increases, or the area of an opening (e.g., M in fig. 26) through which the helmholtz resonator 25A communicates with the front chamber 111 (or rear chamber 112) decreases, the wider the bandwidth of the helmholtz resonator 25A that attenuates the high frequency resonance peak, the more remarkable the attenuation effect.

As an example, in conjunction with (b) in fig. 25, the helmholtz resonator chamber 25A may be provided in communication with the rear chamber 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 arranged to attenuate the peak resonance intensity of the first resonance peak. Wherein, the peak resonance frequency of the first resonance peak may be greater than or equal to 2kHz. Further, with reference to fig. 26, the difference between the peak resonance intensity of the first resonance peak when the opening of the helmholtz resonator cavity 25A communicating rear cavity 112 is in an open state and the peak resonance intensity of the first resonance peak when the opening of the helmholtz resonator cavity 25A communicating rear cavity 112 is in a closed state is greater than or equal to 3dB.

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

As an example, in conjunction with (d) in fig. 25, the helmholtz resonator chamber 25A may be provided to communicate the front chamber 111 and the rear chamber 112 at the same time. Wherein the area of the opening communicating with the front chamber 111 may be greater than or equal to the area of the opening communicating with the rear chamber 112.

Further, an opening of the helmholtz resonator chamber 25A communicating with the front chamber 111 (or the rear chamber 112) may also be provided with an acoustic resistive mesh 25B. In addition, with reference to fig. 27, as the acoustic resistance of the acoustic resistance mesh 25B (e.g., R in fig. 27) increases, the frequency response curve is flatter and the sound quality is more uniform. Illustratively, the porosity of the acoustic resistive mesh 25B may be greater than or equal to 3%.

In connection with fig. 28, the earphone 100 may include a processing circuit 28A, and the 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 transducer device 12. The audio file may be transmitted to the processing circuit 28A in a wired/wireless manner, the processing circuit 28A may perform signal processing such as decoding, equalization, gain adjustment, etc. on the audio file, and the processed signal is further input to a speaker, where the speaker performs conversion from an electrical signal to sound (e.g., bone conduction and/or air conduction), and further outputs the sound.

Based on the above-described related description, the front cavity 111 and the rear cavity 112 may 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 114, and the sound adjusting 117 has a resonance peak, respectively. Any of the above embodiments mainly shifts the peak resonance frequency of the resonance peak to a high frequency so as to improve the sound quality and leakage of the earphone 100. Further, the peak resonance intensity of the air guide sound at the resonance peak increases drastically, resulting in an unbalanced sound quality. To this end, the processing circuit 28A may include at least one Equalizer (EQ) that may set the signal gain coefficient of the first frequency band of the audio file to be greater than the signal gain coefficient of the second frequency band, and the second frequency band is higher than the first frequency band, so as to attenuate the signal amplitude of the relatively high frequency band, thereby reducing the signal output of the frequency, attenuate the sudden increase of the air guide sound, and thereby make the sound quality more balanced. Of course, the sudden increase in bone conduction can also be attenuated to increase the balance. Wherein the signal gain coefficient is represented by a positive number when the equalizer performs gain processing on the audio file, and by a negative number when the equalizer performs attenuation processing on the audio file. Furthermore, the equalizing function of the equalizer can be realized through a filter, the filter can be a single module or a plurality of modules, and the filter can be an analog filter or a digital filter.

As an example, the first frequency band may include at least 500Hz.

As an example, the second frequency band may comprise at least 3.5k or 4.5kHz.

As an example, 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 is located in the second frequency band or higher than the second frequency band. Therefore, the resonance peak is offset towards a 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 further reduced, the sudden increase of the air conduction sound is weakened, and the high frequency of the tone quality is further 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 earphone 100. The larger the volume is, the smaller the signal gain coefficient of the first frequency band is. For example, the equalizer can make the gain coefficient of the low frequency signal larger under the condition of smaller volume, so that the low frequency is sufficient and full in hearing and the tone quality is better, and the equalizer can make the gain coefficient of the low frequency signal smaller under the condition of larger volume, so as to avoid sound breaking caused by overlarge amplitude of the loudspeaker.

Referring to fig. 29, the deck housing 11 may include a main housing 29A, an auxiliary housing 29B, and an elastic connection member 29C. Wherein the main housing 29A may be adapted to contact the skin of a user and form a skin contact area. The transducer assembly 12 may be coupled to the main housing 29A and the diaphragm 13 may be coupled between the transducer assembly 12 and the main housing 29A. At this time, the main housing 29A may form a front cavity 111 in cooperation with the diaphragm 13, and the auxiliary housing 29B may be connected to the main housing 29A through the elastic connection member 29C and may form a rear cavity 112 in cooperation with the diaphragm 13. Further, the vibration system formed by the auxiliary housing 29B and the elastic connection member 29C has a natural frequency f0. At this time, the auxiliary housing 29B may be disposed opposite to the skin contact area. The natural frequency can be adjusted according to parameters such as the elastic coefficients of the auxiliary housing 29B and the elastic connector 29C, and 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.

As an example, in connection with fig. 30, when the vibration frequency of the main casing 29A is between 20Hz and 150Hz, the phase difference between the sub casing 29B and the main casing 29A may be between-pi/3 and +pi/3. At this time, the auxiliary housing 29B has good follow-up performance with respect to the main housing 29A, and even the vibration of the contact area between the auxiliary housing 29B and the skin can be in phase, the air in the rear chamber 112 can be compressed or expanded, and further, the air guide sound outputted to the outside of the earphone 100 through the sound output hole 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 follow-up property of the sub-housing 29B with respect to the main housing 29A is poor, and even the vibration of the contact area of the sub-housing 29B with the skin can be reversed, the air in the rear chamber 112 is hard to be compressed or expanded, and thus it is difficult to form the air guide sound to be outputted to the outside of the earphone 100 through the sound outlet 113.

In short, by reasonably designing the natural frequency of the auxiliary housing 29B, it is possible to control the earphone 100 to form the air conduction sound outputted to the outside of the earphone 100 through the sound output hole 113 in a certain 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 output hole 113 in another frequency band (for example, > f 0), thereby supplementing the specific frequency band of the bone conduction sound with the air conduction sound.

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

Based on the above-described related description, the skin contact area of the cartridge case 11 is used to contact the skin of the user so as to transmit mechanical vibration generated by the cartridge module 10, thereby forming bone conduction sound. Wherein, the earphone 100 generates bone conduction sound and simultaneously the transducer device 12 and the core shell 11 move relatively. Further, because of the diaphragm 13, the rear cavity 112 generates the air-guide sound which is in-phase with the bone-guide sound and is transmitted to the human ear through the sound outlet 113 during the above-mentioned relative movement. Based on this, mechanical properties of the user's skin (e.g., elasticity, damping, mass) can adversely affect the vibration state of cartridge module 10. Specifically, the closer the cartridge case 11 is to the skin of the user, the more closely the vibration of the cartridge case 11 becomes weakened. Accordingly, the vibration of the movement housing 11 is weakened, so that the relative movement between the movement housing 11, the transducer 12 and the diaphragm 13 is weakened, and thus the air guide sound is reduced, and finally the listening effect of the air guide sound is affected. However, the movement case 11 cannot be completely separated from the skin of the user, because this affects the transmission of bone conduction sounds, and thus the listening effect of the bone conduction sounds. For this reason, in the wearing state of the earphone 100, the first region 31A of the skin contact region is disposed to be in contact with the skin of the user, and the second region 31B of the skin contact region is disposed to be inclined 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 may be remote from the ear-hook component 20 as 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 degrees 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 deck housing 11. Of course, the movement case 11 may be provided with an arc surface so that the first region 31A is provided to be fitted to the skin of the user while the second region 31B is provided to be inclined to the skin of the user at an interval.

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 guide sound.

Based on the above description, and referring to fig. 2 and 17, the pressure relief hole 114 may enable the front cavity 111 to communicate with the exterior of the earphone 100, the sound adjusting hole 117 may enable the rear cavity 112 to communicate with the exterior of the earphone 100, and at least a portion of the pressure relief hole 114 and at least a portion of the sound adjusting hole 117 may also be disposed adjacent to each other, and a distance therebetween may be less than or equal to 2mm, for example, the first pressure relief hole 1141 is disposed adjacent to the first sound adjusting hole 1171, and the second pressure relief hole 1142 is disposed adjacent to the second sound adjusting hole 1172. Based on this, the deck module 10 may further include a protection cover 15, and the protection cover 15 may be covered on the peripheries of the pressure release hole 114 and the sound adjusting hole 117. The protective cover 15 may be woven from metal wires, the wire diameter of the metal wires may be 0.1mm, and the mesh number of the protective cover 15 may be 90-100, so that the protective cover has a certain structural strength and good air permeability, and thus, foreign objects can be prevented from invading the interior of the core module 10, and acoustic expressive force of the earphone 100 can be not affected. Thus, the protection cover 15 can cover the pressure release hole 114 and the sound adjusting hole 117 which are adjacently arranged at the same time, namely, a cover two holes, thereby greatly reducing materials and improving the appearance quality of the earphone 100.

As an example, in connection with fig. 32, the outer surface of the deck housing 11 may be provided with a receiving area 118, and the receiving area 118 may be in communication with the outlet ends of the adjacently disposed pressure release hole 114 and sound adjustment hole 117. At this time, the protection cover 15 may be configured to have a plate shape, and may be fixed in the accommodating area 118 by one of or a combination of fastening, bonding, welding, etc., for example, bonding or welding with the bottom of the accommodating area 118 to cover the pressure relief hole 114 and the sound adjusting hole 117. The outer surface of the protective cover 15 may be flush with the outer surface of the deck housing 11 or may be in arc transition to improve the appearance quality of the earphone 100.

Further, a boss 1181 may be formed in the accommodating area 118, where the boss 1181 is spaced from a sidewall of the accommodating area 118 to form an accommodating groove 1182 surrounding the boss 1181. The groove width of the accommodating groove 1182 may be less than or equal to 0.3mm. At this time, the 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 accommodating groove 1182 may surround the pressure relief hole 114 and the sound adjusting hole 117. Accordingly, the protection cover 15 may include a main cap plate 151 and an annular side plate 152, and the annular side plate 152 is bent and connected with an edge of the main cap plate 151 to extend laterally of the main cap plate 151. Wherein the height of the annular side plate 152 with respect to the main cap plate 151 may be between 0.5mm and 1.0 mm. Thus, when the protection cover 15 is fixed in the accommodating area 118, the annular side plate 152 can be inserted and fixed in the accommodating groove 1182, so as to improve the connection strength between the protection cover 15 and the movement housing 11. For example, the annular side plate 152 is fixedly connected to the deck housing 11 through a gel (not shown) in the accommodating groove 1182. Further, the main cap plate 151 may be coupled to the top of the boss 1181 by welding. Wherein the top of the boss 1181 may be slightly lower than the outer surface of the deck housing 11, for example, the step difference therebetween is about equal to the thickness of the main cap plate 151.

Based on the above-mentioned related description, and referring to fig. 32 and fig. 2, the outlet ends of the pressure relief hole 114 and the sound adjusting hole 117 may be further covered with an acoustic resistance net 1140 and an acoustic resistance net 1170, respectively, so as to adjust the effective areas of the outlet ends of the pressure relief hole 114 and the sound adjusting hole 117, respectively, thereby improving the acoustic expressive force of the earphone 100. At this time, the acoustic resistive mesh 1140 and the acoustic resistive mesh 1170 may be first fixed to the top of the boss 1181 by the first annular film 1183, and then the protective cover 15 may be fixed to the receiving area 118. Wherein, the first annular film 1183 surrounds the pressure relief hole 114 and the sound adjusting hole 117 to expose the outlet ends of the two. Further, the main cover plate 151 may be fixed to the acoustic resistive mesh 1140 and the acoustic resistive mesh 1170 by a second annular film 1184. Wherein, the loop widths of the first loop film 1183 and the second loop film 1184 can be between 0.4mm and 0.5mm, and the thicknesses can be less than or equal to 0.1mm, respectively. Of course, in other embodiments, the acoustically resistive mesh 1140 and the acoustically resistive mesh 1170 can be pre-attached to the housing 15 to form a structural assembly that is then attached within the receiving area 118. For example, the acoustic resistive mesh 1140 and the acoustic resistive mesh 1170 are fixed to the same side of the main cover plate 151 by a second annular film 1184 and are surrounded by the annular side plate 152 to form a structural assembly with the shield 15. Wherein the acoustically resistive mesh 1140 and the acoustically resistive mesh 1170 may be at least partially offset from each other to facilitate covering the exit ends of the adjacently disposed pressure relief holes 114 and acoustic tuning holes 117, respectively, and to facilitate adapting the separation distance therebetween.

It should be noted that, in connection with fig. 2, the end of the sound guide member 14 facing away from the movement housing 11 may also be fixedly provided with the acoustic resistive mesh 140 and the corresponding protection cover 15 in the same or similar manner as in any of the above-mentioned modes, so that the acoustic resistive mesh 140 is disposed at the outlet end of the sound guide channel 141 and covered by the corresponding protection cover 15.

Referring to fig. 33 and 2, the coil bracket 121 may be exposed from the side of the front case 116 in a direction perpendicular to the fastening direction of the rear case 115 and the front case 116. In other words, with reference to fig. 4, for the front case 116, the side of the front cylindrical side plate 1162 adjacent to the sound outlet 113 or the sound guiding member 14 may be at least partially cut away to form a relief area for exposing the coil support 121. Further, the sound guide member 14 may be fastened to the exposed portion of the coil support 121 and the outside of the rear case 115, and the sound guide passage 141 is made to communicate with the sound outlet 113. In this way, the side of the front case 116 adjacent to the sound guide member 14 may not need to completely wrap the coil support 121, so that the core module 10 may not be partially too thick, and the fixation between the sound guide member 14 and the core case 11 may not be hindered.

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. Wherein the boss 119 may include a first sub-boss portion 1191 located at the rear housing 115 and a second sub-boss portion 1192 located at the coil support 121. At this time, the sound outlet 113 may be entirely provided to the rear housing 115, and an outlet end of the sound outlet 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 recess area 142. At this time, the inlet end of the sound guide channel 141 may communicate with the bottom of the recess 142. Thus, when the sound guide member 14 is assembled with the deck housing 11, the boss 119 may be embedded in the recessed area 142, and the sound guide passage 141 is made to communicate with the sound outlet 113. In connection with fig. 2, the relationship between the height of the boss 119 and the depth of the recess 142 may be such that, when the top of the boss 119 abuts against the bottom of the recess 142, the end surface of the sound guide member 14 just contacts the deck housing 11, or a gap is left between them, so as to improve the air tightness between the sound guide channel 141 and the sound outlet 113. Based on this, an annular seal (not shown) or the like may also be provided between the top of the boss 119 and the bottom of the recessed area 142.

Further, one of the rear housing 115 and the sound guide member 14 may be provided with a receiving hole 1154, and correspondingly, the other may be provided with a receiving post 143. The receiving post 143 may be inserted and fixed into the receiving hole 1154, so as to improve the accuracy and reliability of assembling the sound guide member 14 and the movement housing 11. Illustratively, the receiving hole 1154 is disposed in the rear housing 115, and may be disposed in the first sub-boss portion 1191, and the receiving post 143 is disposed in the sound guide member 14, and may be disposed in the recessed region 142.

It should be noted that, in connection with fig. 33, the sound guide member 14 and the deck housing 11 may be assembled in the direction indicated by the broken line in fig. 33.

In some embodiments, for example, the deck module 10 is not provided with the diaphragm 13, and the front housing 116 may press the coil support 121 against the annular bearing platform 1153 to improve the reliability of the assembly of the deck module 10. Specifically, the front case 116 may press the other end of the second cylindrical holder portion 1213 facing away from the annular body portion 1211 against the annular mount 1153.

In other embodiments, for example, the cartridge module 10 is provided with the diaphragm 13, and the front housing 116 can hold the coil support 121 and the diaphragm 13 connected thereto together on the annular bearing platform 1153, so as to improve the reliability of assembling the cartridge module 10. Wherein the diaphragm 13 may be connected to the other end of the second cylindrical holder portion 1213 facing away from the annular body portion 1211 through its reinforcing ring 136. Specifically, the front case 116 can press the reinforcing ring 136 against the annular mount 1153 through the second cylindrical holder portion 1213.

As an example, referring to fig. 33 and 4, the sound adjusting hole 117 may be formed as a complete through hole in the rear housing 115, and the pressure releasing hole 114 may be formed as an incomplete notch in the front housing 116, and form a complete through hole by splicing the rear housing 115 and the front housing 116. In this way, the spacing distance between the pressure release hole 114 and the sound adjusting hole 117 which are adjacently arranged is conveniently reduced, and the actual area of the outlet end of the pressure release hole 114 is conveniently larger than that of the outlet end of the sound adjusting hole 117.

The foregoing description is only a partial embodiment of the present application, and is not intended to limit the scope of the present application, and all equivalent devices or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.

Claims

1. An earphone, characterized in that the earphone comprises a movement module, the movement module comprises a movement shell, a transducer and a diaphragm, the movement shell is used to contact with the user's skin and form a receiving cavity, the movement shell comprises a rear shell and a front shell surrounding the receiving cavity, the transducer is arranged in the receiving cavity and connected to the movement shell, so that the skin contact area of the movement shell generates bone conduction sound under the action of the transducer, the diaphragm is connected between the transducer and the movement shell, so as to separate the receiving cavity into a front cavity close to the skin contact area and a rear cavity away from the skin contact area, the movement shell is provided with a sound outlet hole connected to the rear cavity, and the diaphragm generates air conduction sound transmitted to the human ear through the sound outlet hole during the relative movement of the transducer and the movement shell;

The movement shell is also provided with at least one sound tuning hole connected to the rear cavity, and the movement module also includes a sound guiding component connected to the movement shell, and the sound guiding component is provided with a sound guiding channel, which is connected to the sound outlet hole and is used to guide the air-conducted sound to the human ear, and the effective area of the outlet end of the sound guiding channel is larger than the effective area of the outlet end of each of the sound tuning holes.

2 . The earphone according to claim 1 , wherein the effective area of the outlet end of the sound guiding channel is larger than the sum of the effective areas of the outlet ends of all the sound tuning holes.

3. The earphone according to claim 2, characterized in that the ratio of the sum of the effective areas of the outlet ends of all the sound tuning holes to the effective area of the outlet end of the sound guiding channel is greater than or equal to 0.08.

4 . The earphone according to claim 3 , wherein the sum of the effective areas of the outlet ends of all the sound tuning holes is greater than or equal to 1.5 mm ² .

5. The earphone according to claim 2 is characterized in that the outlet end cover of the sound guiding channel is provided with a first acoustic resistance net, and the outlet end covers of at least part of the sound tuning holes are provided with a second acoustic resistance net, and the porosity of the second acoustic resistance net is smaller than the porosity of the first acoustic resistance net.

6 . The earphone according to claim 2 , wherein the actual area of the outlet end of the sound guiding channel is larger than the actual area of the outlet end of each of the sound tuning holes.

7 . The earphone according to claim 6 , wherein the actual area of the outlet end of the sound guiding channel is greater than or equal to 4.8 mm ² .

8. The earphone according to claim 1 is characterized in that the frequency response curve of the air-conducted sound output to the outside of the earphone through the sound outlet has a resonance peak, and the peak resonance frequency of the resonance peak when the at least one tuning hole is in an open state is shifted toward a high frequency compared to the peak resonance frequency of the resonance peak when the at least one tuning hole is in a closed state, and the offset is greater than or equal to 500 Hz.

9 . The earphone according to claim 8 , wherein the peak resonance frequency of the resonance peak when the at least one tuning hole is in an open state is greater than or equal to 2 kHz.

10. The earphone according to claim 9 is characterized in that the movement shell is also provided with at least one pressure relief hole connected to the front cavity, and at least part of the pressure relief holes and at least part of the sound adjustment holes are respectively arranged adjacent to each other, and the spacing distance is less than or equal to 2 mm.