A pair of headphones

Abstract

This application mainly relates to a headset. The movement housing is used to contact the user's skin. The transducer device causes the skin contact area of the movement housing to generate bone conduction sound under the action of the transducer device. The diaphragm divides the accommodation cavity into a front cavity and a rear cavity. The movement housing is provided with a sound outlet hole communicating with the rear cavity. The diaphragm generates air conduction sound transmitted to the human ear through the sound outlet hole during the relative movement between the transducer device and the movement housing, enabling the headset to output bone conduction sound and air conduction sound and improving the acoustic performance of the headset. The movement module includes a Helmholtz resonance cavity communicating with the front cavity and / or the rear cavity to absorb the sound energy of the front cavity and / or the rear cavity near its peak resonance frequency through the Helmholtz resonance cavity, thereby suppressing the sudden increase in the peak resonance intensity and making the frequency response curve of the air conduction sound output to the outside of the headset through the sound outlet hole flatter, improving the acoustic performance of the headset.

Description

Technical Field

[0001] The present application relates to the technical field of electronic devices, and more particularly to a headset. Background Art

[0002] With the continuous popularization of electronic devices, electronic devices have become an indispensable social and entertainment tool in people's daily lives, and people's requirements for electronic devices are also getting higher and higher. Taking electronic devices such as headsets as an example, there is an urgent need not only for excellent wearing comfort, but also for sound quality with deep bass and penetrating treble, as well as good battery life. Summary of the Invention

[0003] An embodiment of the present application provides a headset, which includes a movement module. The movement module includes a movement housing, a transducer, and a diaphragm. The movement housing is used to contact the user's skin and form an accommodation cavity. The transducer is disposed in the accommodation cavity and connected to the movement housing, so that the skin contact area of the movement housing generates bone conduction sound under the action of the transducer. The diaphragm is connected between the transducer and the movement housing to divide the accommodation cavity into a front cavity close to the skin contact area and a rear cavity far from the skin contact area. The movement housing is provided with a sound outlet hole communicating with the rear cavity. The diaphragm generates air conduction sound transmitted to the human ear through the sound outlet hole during the relative movement between the transducer and the movement housing; the movement module further includes a Helmholtz resonance cavity communicating with the front cavity and / or the rear cavity.

[0004] The beneficial effect of the present application is that the headset provided by the present application can output bone conduction sound and air conduction sound by arranging a diaphragm between the transducer and the movement housing, which can improve the acoustic performance of the headset. Further, the Helmholtz resonance cavity absorbs the sound energy near the peak resonance frequency of the front cavity and / or the rear cavity to suppress the sudden increase in the peak resonance intensity, so that the frequency response curve of the air conduction sound output to the outside of the headset through the sound outlet hole is flatter, thereby improving the acoustic performance of the headset. Brief Description of the Drawings

[0005] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0006] Figure 1 is a schematic structural diagram of an embodiment of the headset provided by the present application;

[0007] Figure 2 is a schematic cross-sectional structural diagram of an embodiment of the movement module provided by the present application;

[0008] Figure 3It is a schematic diagram for comparing the frequency response curves before and after the diaphragm is set in the earphone provided by this application;

[0009] Figure 4 It is a schematic cross-sectional structure diagram of an embodiment of the movement housing provided by this application;

[0010] Figure 5 It is a schematic cross-sectional structure diagram of an embodiment of the transducer provided by this application;

[0011] Figure 6 It is a schematic partial cross-sectional structure diagram of various embodiments of the diaphragm provided by this application;

[0012] Figure 7 It is a schematic partial cross-sectional structure diagram of the diaphragm provided by this application;

[0013] Figure 8 It is a schematic principle structure diagram of various embodiments of the sound guiding component provided by this application;

[0014] Figure 9 It is a schematic top view structure diagram of an embodiment of the sound resistance net provided by this application;

[0015] Figure 10 It is a schematic diagram of the frequency response curve of air conduction sound at the sound guiding component of an embodiment of the earphone provided by this application;

[0016] Figure 11 It is a schematic diagram of the frequency response curve of air conduction sound at the sound guiding component of an embodiment of the earphone provided by this application;

[0017] Figure 12 It is a schematic diagram of the frequency response curve of air conduction sound at the pressure relief hole of an embodiment of the earphone provided by this application;

[0018] Figure 13 It is a schematic comparison diagram of the sound pressure distribution in the rear cavity before and after the sound tuning hole is set in the movement module provided by this application;

[0019] Figure 14 It is a schematic diagram of the frequency response curve of air conduction sound at the sound guiding component of an embodiment of the earphone provided by this application;

[0020] Figure 15 It is a schematic diagram of the frequency response curve of air conduction sound at the sound guiding component of an embodiment of the earphone provided by this application;

[0021] Figure 16 It is a schematic diagram of the frequency response curve of sound leakage of the movement module provided by this application;

[0022] Figure 17 It is a schematic principle structure diagram of an embodiment of the movement module provided by this application;

[0023] Figure 18It is a schematic diagram of the principle structure of an embodiment of the movement module provided by the present application;

[0024] Figure 19 It is a schematic diagram of the comparison of the frequency response curves of air-conducted sound at the front and rear pressure relief holes of the movement module provided by the present application;

[0025] Figure 20 It is a schematic diagram of the structure of an embodiment of the coil bracket provided by the present application;

[0026] Figure 21 It is a schematic diagram of the principle structure of various embodiments of the movement module provided by the present application;

[0027] Figure 22 It is a schematic diagram of the frequency response curve of air-conducted sound at the sound guiding component of an embodiment of the earphone provided by the present application;

[0028] Figure 23 It is a schematic diagram of the frequency response curve of sound leakage of the movement module provided by the present application;

[0029] Figure 24 It is a schematic diagram of the frequency response curve of air-conducted sound at the sound guiding component of an embodiment of the earphone provided by the present application;

[0030] Figure 25 It is a schematic diagram of the principle structure of various embodiments of the movement module provided by the present application;

[0031] Figure 26 It is a schematic diagram of the frequency response curve of air-conducted sound at the sound guiding component of an embodiment of the earphone provided by the present application;

[0032] Figure 27 It is a schematic diagram of the frequency response curve of air-conducted sound at the sound guiding component of an embodiment of the earphone provided by the present application;

[0033] Figure 28 It is a schematic diagram of the structure of an embodiment of the earphone provided by the present application;

[0034] Figure 29 It is a schematic diagram of the principle structure of an embodiment of the movement module provided by the present application;

[0035] Figure 30 It is a schematic diagram of the frequency response curve of air-conducted sound at the sound guiding component of an embodiment of the earphone provided by the present application;

[0036] Figure 31 It is a schematic diagram of the principle structure of an embodiment of the earphone provided by the present application;

[0037] Figure 32 It is a schematic diagram of the exploded structure of an embodiment of the movement module provided by the present application;

[0038] Figure 33It is a schematic exploded view of an embodiment of the movement module provided by this application. Specific Embodiments

[0039] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be specifically noted that the following embodiments are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following embodiments are only partial embodiments of the present application rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0040] When the "embodiment" is mentioned in the present application, it means that the specific features, structures or characteristics described in combination with the embodiment may be included in the embodiments of the present application. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application may be combined with other embodiments.

[0041] In combination with Figure 1 , the earphone 100 may include two movement modules 10, two earhook assemblies 20 and a rear hook assembly 30. Among them, both ends of the rear hook assembly 30 are respectively connected to one end of the corresponding earhook assembly 20, and the other end of each earhook assembly 20 facing away from the rear hook assembly 30 is respectively connected to the corresponding movement module 10. Further, the rear hook assembly 30 may be arranged in a curved shape for winding around the back of the user's head, and the earhook assembly 20 may also be arranged in a curved shape for hanging between the user's ear and head, so as to facilitate the wearing requirement of the earphone 100; while the movement module 10 is used 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 a worn state, the two movement modules 10 are respectively located on the left and right sides of the user's head, and the two movement modules 10 also press the user's head under the cooperation of the two earhook assemblies 20 and the rear hook assembly 30, and the user can also hear the sound output by the earphone 100.

[0042] It should be noted that: the earphone 100 may also have other wearing methods. For example, the earhook assembly 20 covers or encloses the user's ear, and the rear hook assembly 30 straddles the user's head, which will not be listed one by one here.

[0043] In combination with Figure 1, the earphone 100 may further include a main control circuit board 40 and a battery 50. Among them, the main control circuit board 40 and the battery 50 may be arranged in the accommodation bin of the same earhook assembly 20, or may be respectively arranged in the accommodation bins of the two earhook assemblies 20. Further, both the main control circuit board 40 and the battery 50 may be electrically connected to the two movement modules 10 through corresponding wires. The former may be used to control the movement module 10 to convert an electrical signal into mechanical vibration, and the latter may be used to supply electrical energy to the earphone 100. Of course, the earphone 100 described in this application may further include microphones, pickups and other types of microphones and communication components such as Bluetooth and NFC. They may also be connected to the main control circuit board 40 and the battery 50 through corresponding wires to achieve corresponding functions.

[0044] It should be noted that: there are two movement modules 10 provided in the earphone 100 described in this application. Both of the two movement modules 10 can convert an electrical signal into movement vibration, mainly to facilitate the earphone 100 to achieve a stereo sound effect. Therefore, in some other application scenarios where the requirement for stereo is not particularly high, such as hearing aid for hearing-impaired patients, live teleprompter for hosts, etc., the earphone 100 may also be provided with only one movement module 10.

[0045] Based on the above related description, the movement module 10 is used to convert an electrical signal into mechanical vibration in the energized state, so that the user can hear sound through the earphone 100. Generally speaking, the aforementioned mechanical vibration may be based on the bone conduction principle and mainly act directly on the user's auditory nerve through the user's bones and tissues as a medium, or may be based on the air conduction principle and mainly act on the user's eardrum through the air as a medium, and then act 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 bone conduction sound, air conduction sound, or both bone conduction sound and air conduction sound at the same time.

[0046] Combined with Figure 2 and Figure 1 , the movement module 10 may include a movement housing 11 and a transducer 12. Among them, the movement housing 11 is connected to one end of the earhook assembly 20 and is used to contact the user's skin. Further, the movement housing 11 also forms an accommodation cavity (not marked in the figure), and the transducer 12 is arranged in the aforementioned accommodation cavity and is connected to the movement housing 11. Among them, the transducer 12 is used to convert an electrical signal into mechanical vibration in the energized state, so that the skin contact area of the movement housing 11 (such as Figure 4The front bottom plate 1161 shown in the figure can generate bone-conducted sound under the action of the transducer device 12. In this way, when the user wears the earphone 100, the transducer device 12 converts the electrical signal into the vibration of the movement to drive the aforementioned skin contact area to generate mechanical vibration together. The mechanical vibration then directly acts on the auditory nerve of the user through the user's bones and tissues as a medium, so that the user can hear the bone-conducted sound through the movement module 10.

[0047] Furthermore, the movement module 10 may further include a diaphragm 13 connected between the transducer device 12 and the movement housing 11. The diaphragm 13 is used to divide the internal space of the movement housing 11 (i.e., the aforementioned accommodation cavity) into a front cavity 111 close to the aforementioned skin contact area and a rear cavity 112 far from the aforementioned skin contact area. In other words, when the user wears the earphone 100, the front cavity 111 can be closer to the user than the rear cavity 112. Among them, the movement housing 11 is provided with a sound outlet hole 113 communicating with the rear cavity 112. The diaphragm 13 can generate air-conducted sound transmitted to the human ear through the sound outlet hole 113 during the relative movement of the transducer device 12 and the movement housing 11. In this way, the sound generated in the rear cavity 112 can be transmitted through the sound outlet hole 113 and then act on the eardrum of the user through the air as a medium, so that the user can also hear the air-conducted sound through the movement module 10.

[0048] It should be noted that: in combination with Figure 2, when the transducer device 12 moves the above-mentioned skin contact area towards the direction close to the user's face, it can be simply regarded as bone conduction sound enhancement. At the same time, the part of the movement mechanism housing 11 opposite to the aforementioned skin contact area moves towards the direction close to the user's face, and the transducer device 12 and the diaphragm 13 connected thereto move towards the direction away from the user's face due to the relationship of action and reaction, so that the air in the rear cavity 112 is squeezed. Corresponding to the increase in air pressure, as a result, the sound transmitted through the sound outlet hole 113 is enhanced, which can be simply regarded as air conduction sound enhancement. Correspondingly, when the bone conduction sound weakens, the air conduction sound also weakens. Based on this, the bone conduction sound and the air conduction sound generated by the movement module 10 in the present application have the characteristic of the same phase. Further, since the front cavity 111 and the rear cavity 112 are generally separated by structural components such as the diaphragm 13 and the transducer device 12, the change law of the air pressure in the front cavity 111 is exactly opposite to the change law of the air pressure in the rear cavity 112. Based on this, the movement mechanism housing 11 can also be provided with a pressure relief hole 114 communicating with the front cavity 111, and the pressure relief hole 114 enables the front cavity 111 to communicate with the external environment, that is, air can freely enter and exit the front cavity 111. In this way, the change of the air pressure in the rear cavity 112 can be blocked by the front cavity 111 as little as possible, which can effectively improve the acoustic performance of the air conduction sound generated by the movement module 10. Among them, the pressure relief hole 114 and the sound outlet hole 113 are staggered from each other, that is, the two are not adjacent, so as to avoid the sound cancellation phenomenon as much as possible due to the opposite phase.

[0049] As an example, the actual area of the outlet end of the sound outlet hole 113 can be greater than or equal to 8 mm 2 , so that the user can hear more air conduction sounds. Among them, the actual area of the inlet end of the sound outlet hole 113 can also be greater than or equal to the actual area of its outlet end.

[0050] It should be noted that: due to the fact that structural components such as the movement mechanism housing 11 have a certain thickness, the through holes such as the sound outlet hole 113 and the pressure relief hole 114 opened on the movement mechanism housing 11 have a certain depth. Further, with respect to the above-mentioned accommodation cavity, the aforementioned through holes have an inlet end close to the aforementioned accommodation cavity and an outlet end far from the aforementioned accommodation cavity. Further, the actual area of the outlet end described in the present application can be defined as the area size of the end face where the outlet end is located.

[0051] In the above manner, since the air-conducted sound and bone-conducted sound generated by the movement module 10 originate from the same vibration source (i.e., the transducer device 12) and have the same phase, the sound heard by the user through the earphone 100 can be stronger, and the earphone 100 can also be more power-saving, thereby extending the battery life of the earphone 100. In addition, by reasonably designing the structure of the movement module 10, the air-conducted sound and bone-conducted sound can also be made to cooperate with each other in the frequency bands of the frequency response curve, so that the earphone 100 can have excellent acoustic performance in specific frequency bands. For example, the air-conducted sound compensates for the low-frequency band of the bone-conducted sound, and for another example, the air-conducted sound strengthens the middle-frequency band and the mid-high frequency band of the bone-conducted sound.

[0052] It should be noted that in this application, the frequency range corresponding to the low-frequency band can be 20 - 150 Hz, the frequency range corresponding to the middle-frequency band can be 150 - 5 kHz, and the frequency range corresponding to the high-frequency band can be 5k - 20 kHz. Among them, the frequency range corresponding to the mid-low frequency band can be 150 - 500 Hz, and the frequency range corresponding to the mid-high frequency band can be 500 - 5 kHz.

[0053] Based on the above detailed description and combined with Figure 3 , the above skin contact area can generate bone-conducted sound under the action of the transducer device 12, and the foregoing bone-conducted sound correspondingly has a frequency response curve. Among them, the foregoing frequency response curve can have at least one resonance peak. Further, the peak resonance frequency of the foregoing resonance peak can satisfy the relational expression: |f1 - f2| / f1 ≤ 50%. In addition, the difference between the peak resonance intensity corresponding to f1 and the peak resonance intensity corresponding to f2 can be less than or equal to 5 dB. Among them, f1 is the peak resonance frequency of the foregoing resonance peak when the diaphragm 13 is connected to the transducer device 12 and the movement housing 11, and f2 is the peak resonance frequency of the foregoing resonance peak when the diaphragm 13 is disconnected from any one of the transducer device 12 and the movement housing 11. In other words, |f1 - f2| / f1 can be used to measure the influence of the diaphragm 13 on the transducer device 12 to drive the foregoing skin contact area; among them, the smaller the ratio, the smaller the influence. In this way, on the basis of not affecting the original resonance system of the movement module 10 as much as possible, by introducing the diaphragm 13, the movement module 10 can synchronously output bone-conducted sound and air-conducted sound with the same phase, thereby improving the acoustic performance of the movement module 10 and making it more power-saving.

[0054] As an example, combined with Figure 3, in this embodiment, the offset in the low-frequency band or the mid-low-frequency band of the frequency response curve can be mainly examined, that is, f1 ≤ 500 Hz, so that the low-frequency and mid-low-frequency of the bone-conducted sound are not affected as much as possible. Among them, the aforementioned offset can be less than or equal to 50 Hz, that is, |f1 - f2| ≤ 50 Hz, so that the diaphragm 13 does not affect the transducer device 12 to drive the above-mentioned skin contact area as much as possible. Further, the aforementioned offset can be greater than or equal to 5 Hz, that is, |f1 - f2| ≥ 5 Hz, so that the diaphragm 13 has a certain structural strength and elasticity, reduces fatigue deformation during use, and thus extends the service life of the diaphragm 13.

[0055] It should be noted that: in combination with Figure 3 , in this embodiment, the above-mentioned skin contact area can be defined to have a first frequency response curve when the diaphragm 13 is connected to the transducer device 12 and the movement housing 11 (for example Figure 3 shown as k1 + k2 in Figure 3 ), and the above-mentioned skin contact area has a second frequency response curve when the diaphragm 13 is disconnected from any one of the transducer device 12 and the movement housing 11 (for example

[0056] shown as k1 in Figure 4 ). Further, for the frequency response curve described in this application, the horizontal axis can represent frequency, and its unit is Hz; the vertical axis can represent intensity, and its unit is dB.

[0056] In combination with Figure 4 and Figure 2 , the movement housing 11 can include a rear housing 115 and a front housing 116 connected to the rear housing 115. Among them, the rear housing 115 and the front housing 116 can be snap-fitted and spliced together to jointly enclose a receiving cavity for accommodating structural components such as the transducer device 12 and the diaphragm 13. Further, the front housing 116 is used to contact the user's skin to form the skin contact area of the movement housing 11, that is, when the movement housing 11 contacts the user's skin, the front housing 116 is closer to the user than the rear housing 115. Based on this, the transducer device 12 can be connected to the front housing 116 so that the transducer device 12 drives the skin contact area of the movement housing 11 to generate mechanical vibration accordingly. Further, the sound outlet hole 113 can be provided on the rear housing 115, and the pressure relief hole 114 can be provided on the front housing 116. The diaphragm 13 can be connected to the rear housing 115, can also be connected to the front housing 116, or can be connected to the splicing part between the rear housing 115 and the front housing 116.

[0057] As an example, the rear housing 115 can include a rear bottom plate 1151 and a rear cylindrical side plate 1152 connected integrally, and one end of the rear cylindrical side plate 1152 facing away from the rear bottom plate 1151 is connected to the front housing 116. Among them, the sound outlet hole 113 can be provided on the rear cylindrical side plate 1152.

[0058] Furthermore, an annular bearing platform 1153 may be provided on the inner side surface of the movement housing 11. For example, the annular bearing platform 1153 is provided at one end of the rear cylindrical side plate 1152 facing away from the rear bottom plate 1151. Among them, in combination with Figure 4 , taking the rear bottom plate 1151 as a reference datum, the annular bearing platform 1153 may be slightly lower than the end surface of the rear cylindrical side plate 1152 facing away from the rear bottom plate 1151. In combination with Figure 2 , in the vibration direction of the transducer device 12, the sound outlet hole 113 may be located between the annular bearing platform 1153 and the rear bottom plate 1151. Based on this, the cross-sectional area of the sound outlet hole 113 may gradually decrease in the direction from the inlet end to the outlet end of the sound outlet hole 113 (that is, the direction in which the sound outlet hole 113 faces the sound outlet channel 141 mentioned hereinafter), so that the annular bearing platform 1153 has sufficient thickness in the vibration direction of the transducer device 12, thereby increasing the structural strength of the annular bearing platform 1153. In this way, when the rear housing 115 and the front housing 116 are buckled, the front housing 116 may press and fix the coil bracket 121 mentioned hereinafter on the annular bearing platform 1153. Further, the diaphragm 13 may be fixed on the annular bearing platform 1153, or be pressed by the coil bracket 121 on the annular bearing platform 1153, and then be connected to the movement housing 11.

[0059] Exemplarily, the front housing 116 may include a front bottom plate 1161 and a front cylindrical side plate 1162 that are integrally connected. One end of the front cylindrical side plate 1162 facing away from the front bottom plate 1161 is connected to the rear housing 115. Among them, the area where the front bottom plate 1161 is located may be simply regarded as the skin contact area described in the present application. Correspondingly, the pressure relief hole 114 may be provided on the front cylindrical side plate 1162.

[0060] In combination with Figure 5 and Figure 2 , the transducer device 12 may include a coil bracket 121, a magnetic circuit system 122, a coil 123, and a spring piece 124. Among them, the coil bracket 121 and the spring piece 124 are provided in the front cavity 111. The central region of the spring piece 124 may be connected to the magnetic circuit system 122, and the peripheral region of the spring piece 124 may be connected to the movement housing 11 through the coil bracket 121 to suspend the magnetic circuit system 122 in the movement housing 11. Further, the coil 123 may be connected to the coil bracket 121 and extend into the magnetic gap of the magnetic circuit system 122.

[0061] Exemplarily, the coil holder 121 may include an annular main body portion 1211 and a first cylindrical holder portion 1212, and one end of the first cylindrical holder portion 1212 is connected to the annular main body portion 1211. Among them, the annular main body portion 1211 may be connected to the peripheral area of the spring piece 124, and the two may form an integral structural member by means of metal insert injection molding process. At this time, the annular main body portion 1211 may be connected to the front bottom plate 1161 by one or a combination of connection methods such as gluing and clamping. Further, the coil 123 is connected to the other end of the first cylindrical holder portion 1222 facing away from the annular main body portion 1211, so as to facilitate the coil to extend into the magnetic circuit system 122. At this time, a part of the diaphragm 13 may be connected to the magnetic circuit system 122, and another part may be connected to at least one of the rear housing 115 and the front housing 116.

[0062] Further, the coil holder 121 may further include a second cylindrical holder portion 1213 connected to the annular main body portion 1211. The second cylindrical holder portion 1213 surrounds the first cylindrical holder portion 1212 and extends laterally toward the annular main body portion 1211 in the same direction as the first cylindrical holder portion 1212. Among them, the second cylindrical holder portion 1213 and the annular main body portion 1211 may be connected to the front housing 116 together to increase the connection strength between the coil holder 121 and the movement housing 11. For example: the annular main body portion 1211 is connected to the front bottom plate 1161, and at the same time, the second cylindrical holder portion 1213 is connected to the second annular side plate 1152. Correspondingly, the second cylindrical holder portion 1213 may be provided with an avoidance hole 1214 communicating with the pressure relief hole 114 to prevent the second cylindrical holder portion 1213 from blocking the communication between the pressure relief hole 114 and the front cavity 111. At this time, a part of the diaphragm 13 may be connected to the magnetic circuit system 122, and another part may be connected to the other end of the second cylindrical holder portion 1213 facing away from the annular main body portion 1211, and then connected to the movement housing 11. Based on this, after the movement module 10 is assembled, the other end of the second cylindrical holder portion 1213 facing away from the annular main body portion 1211 may press another part of the diaphragm 13 on the annular bearing platform 1153.

[0063] It should be noted that: the first cylindrical holder portion 1212 and / or the second cylindrical holder portion 1213 may be a continuous and complete structure in the circumferential direction of the coil holder 121 to increase the structural strength of the coil holder 121, or may be a locally discontinuous structure to avoid other structural members.

[0064] Exemplarily, the magnetic circuit system 122 may include a magnetic shield 1221 and a magnet 1222, which cooperate to form a magnetic field. Among them, the magnetic shield 1221 may include a bottom plate 1223 and a cylindrical side plate 1224 that are integrally connected. Further, the magnet 1222 is disposed inside the cylindrical side plate 1224 and fixed on the bottom plate 1223. One side of the magnet 1222 facing away from the bottom plate 1223 may be connected to the middle region of the spring piece 124 through a connecting member 1225, and the coil 123 is inserted into the 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 shield 1221.

[0065] It should be noted that: the magnet 1222 may be a magnet group formed by a plurality of sub-magnets. In addition, a magnetic guide plate (not marked in the figure) may be provided on the side of the magnet 1222 facing away from the bottom plate 1223.

[0066] Combined with Figure 6 、 Figure 5 and Figure 2 , the diaphragm 13 may include a diaphragm body 131, and the diaphragm body 131 may include a first connecting portion 132, a corrugated portion 133, and a second connecting portion 134 that are integrally connected. Among them, the first connecting portion 132 surrounds the transducer 12 and is connected to the transducer 12; the second connecting portion 134 is disposed around the periphery of the first connecting portion 132 and is spaced apart from the first connecting portion 132 in a direction perpendicular to the vibration direction of the transducer 12; the corrugated portion 133 is located in the spaced area between the first connecting portion 132 and the second connecting portion 134 and connects the first connecting portion 132 and the second connecting portion 134.

[0067] Exemplarily, the first connecting portion 132 may be provided in a cylindrical shape and may be connected to the magnetic shield 1221; the second connecting portion 134 may be provided in a ring shape and may be connected to the other end of the second cylindrical bracket portion 1213 facing away from the ring-shaped main body portion 1211, and then connected to the movement housing 11. Among them, combined with Figure 5 , the connection point between the corrugated portion 133 and the first connecting portion 132 may be lower than the end surface of the cylindrical side plate 1224 facing away from the bottom plate 1223.

[0068] Further, the corrugated portion 133 forms a recessed area 135 between the first connecting portion 132 and the second connecting portion 134, so that the first connecting portion 132 and the second connecting portion 134 can more easily perform relative movement in the vibration direction of the transducer 12, thereby reducing the influence of the diaphragm 13 on the transducer 12. Among them, combined with Figure 2 , the recessed area 135 may be recessed toward the rear cavity 112. Of course, the recessed area 135 may also be recessed toward the front cavity 111, that is, opposite to the recessed direction of the recessed area 135 shown in Figure 2 .

[0069] It should be noted that: the number of the recessed areas 135 can be multiple, such as two or three, and they are spaced apart in the direction perpendicular to the vibration direction of the transducer device 12; the depth of each recessed area 135 in the vibration direction of the transducer device 12 can also be different. Herein, this embodiment takes the number of the recessed areas 135 being one as an example for exemplary illustration.

[0070] Exemplarily, the material of the diaphragm body 131 can be any one or a combination of Polycarbonate (PC), Polyamides (PA), Acrylonitrile Butadiene Styrene (ABS), Polystyrene (PS), High Impact Polystyrene (HIPS), Polypropylene (PP), Polyethylene Terephthalate (PET), Polyvinyl Chloride (PVC), Polyurethanes (PU), Polyethylene (PE), Phenol Formaldehyde (PF), Urea-Formaldehyde (UF), Melamine-Formaldehyde (MF), Polyarylate (PAR), Polyetherimide (PEI), Polyimide (PI), Polyethylene Naphthalate two formic acid glycol ester (PEN), Polyetheretherketone (PEEK), silica gel, etc. Among them, PET is a thermoplastic polyester with good molding, and the diaphragm made of it is often called Mylar film; PC has strong impact resistance and stable dimensions after molding; PAR is an advanced version of PC, mainly for environmental protection considerations; PEI is softer than PET and has higher internal damping; PI is heat-resistant, has a higher molding temperature, and a longer processing time; PEN has high strength and is harder, and its characteristics are that it can be painted, dyed, and plated; PU is often used in the damping layer or surround of composite materials, has high elasticity and high internal damping; PEEK is a newer material, resistant to friction and fatigue. It should be noted that: composite materials generally can take into account the characteristics of multiple materials. Common ones include double-layer structures (generally hot-pressing PU to increase internal resistance), triple-layer structures (sandwich structures, with a damping layer of PU, acrylic glue, UV glue, and pressure-sensitive glue in the middle), and five-layer structures (two thin films are bonded by double-sided tape, and the double-sided tape has a base layer, usually PET).

[0071] Further, the diaphragm 13 may further include a reinforcing ring 136, and the hardness of the reinforcing ring 136 may be greater than that of the diaphragm body 131. Among them, the reinforcing ring 136 may be arranged in a ring shape, and its ring width may be greater than or equal to 0.4 mm, and its thickness may be less than or equal to 0.4 mm. Further, the reinforcing ring 136 is connected to the second connecting portion 134, so that the second connecting portion 134 is connected to the movement housing 11 through the reinforcing ring 136. In this way, the structural strength of the edge of the diaphragm 13 is increased, and further the connection strength between the diaphragm 13 and the movement housing 11 is increased.

[0072] It should be noted that: the reinforcing ring 136 is arranged in a ring shape mainly to facilitate the adaptation to the annular structure of the second connecting portion 134; however, the reinforcing ring 136 may be a continuous complete ring or a discontinuous segmented ring in terms of structure. Further, after the movement module 10 is assembled, the other end of the second cylindrical support portion 1213 facing away from the annular main body portion 1211 can press the reinforcing ring 136 against the annular bearing platform 1153.

[0073] As an example, the first connecting portion 132 may be injection-molded on the outer peripheral surface of the magnetic shield 1221, and the reinforcing ring 136 may also be injection-molded on the second connecting portion 134 to simplify the connection method between the two and increase the connection strength between the two. Among them, the first connecting portion 132 may cover the cylindrical side plate 1224 or may further cover the bottom plate 1223 to increase the contact area between the first connecting portion 132 and the magnetic circuit system 122, and further increase the bonding strength between the two. Similarly, the second connecting portion 134 may be connected to the inner ring surface and one end surface of the reinforcing ring 136 to increase the contact area between the second connecting portion 134 and the reinforcing ring 136, and further increase the bonding strength between the two.

[0074] Combined with Figure 6 , Figure 6 , (a) to (d) in mainly schematically show various structural deformations of the diaphragm body 131, and the main difference between them lies in the specific structure of the corrugated portion 133. Among them, for Figure 6 in (a), the corrugated portion 133 may be arranged in a symmetric structure, and the connection points formed by its two ends with the first connecting portion 132 and the second connecting portion 134 may also be coplanar. For example, the projections of the two connection points in the vibration direction of the transducer 12 coincide. For Figure 6 in (b), the corrugated portion 133 may also be mostly arranged in a symmetric structure, but the connection points formed by its two ends with the first connecting portion 132 and the second connecting portion 134 are not coplanar. For example, the projections of the two connection points in the vibration direction of the transducer 12 are staggered from each other. For Figure 6For the case of (c), the corrugated portion 133 can be arranged in an asymmetric structure, but the connection points formed by its two ends with the first connection portion 132 and the second connection portion 134 are coplanar. For Figure 6 For the case of (d), the corrugated portion 133 can be arranged in an asymmetric structure, and the connection points formed by its two ends with the first connection portion 132 and the second connection portion 134 are not coplanar.

[0075] Based on the above related descriptions, for the diaphragm 13, on the premise that the diaphragm body 131 has a certain structural strength to ensure its basic structure, fatigue resistance and other properties, the softer the diaphragm body 131 is, the easier it is to undergo elastic deformation, and the smaller the impact on the transducer device 12 is. Based on this, the thickness of the diaphragm body 131 can be less than or equal to 0.2 mm; preferably, the thickness of the diaphragm body 131 can be less than or equal to 0.1 mm. Among them, the elastic deformation of the diaphragm body 131 can mainly occur in the corrugated portion 133. Therefore, the thickness of the corrugated portion 133 can be smaller than the thickness of other parts of the diaphragm body 131. Based on this, the thickness of the corrugated portion 133 can be less than or equal to 0.2 mm; preferably, the thickness of the corrugated portion 133 can be less than or equal to 0.1 mm. In this embodiment, the diaphragm body 131 is taken as an example of an equal-thickness structure for exemplary illustration.

[0076] Combined with Figure 7 , in the vibration direction of the transducer device 12, the concave area 135 can have a depth H; in the direction perpendicular to the vibration direction of the transducer device 12, the concave area 135 can have a half-depth width W1, and there can be a spacing distance W2 between the first connection portion 132 and the second connection portion 134. Among them, 0.2 ≤ W1 / W2 ≤ 0.6, which can not only ensure the size of the deformable area on the corrugated portion 133, but also avoid structural interference between the corrugated portion 133 and the first connection portion 132 and / or the movement housing 11. Similarly, 0.2 ≤ H / W2 ≤ 1.4, which can not only ensure the size of the deformable area on the corrugated portion 133 to make it soft enough, but also avoid structural interference between the corrugated portion 133 and the first connection portion 132 and / or the movement housing 11, and avoid the corrugated portion 133 from being difficult to start vibrating due to excessive self-weight.

[0077] It should be noted that: the half-depth width W1 refers to the width of the concave area 135 at a depth of 1 / 2H.

[0078] Furthermore, the folded portion 133 may include a first transition section 1331, a second transition section 1332, a third transition section 1333, a fourth transition section 1334, and a fifth transition section 1335 that are integrally connected. One end of the first transition section 1331 and 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 the fourth transition section 1334 are respectively connected to the other ends of the first transition section 1331 and the second transition section 1332, and both ends of the fifth transition section 1335 are respectively connected to the other ends of the third transition section 1333 and the fourth transition section 1334. At this time, the foregoing respective transition sections together enclose a recessed area 135. Among them, in the direction from the connection point (such as point 7A) between the first transition section 1331 and the first connection portion 132 to the reference position point (such as point 7C) of the folded portion 133 that is farthest from the first connection portion 132, the angle between the tangent line (such as the dotted line TL1) on the side of the first transition section 1331 facing the recessed area 135 and the vibration direction of the transducer device 12 may gradually decrease; similarly, in the direction from the connection point (such as point 7B) between the second transition section 1332 and the second connection portion 134 to the foregoing reference position point, the angle between the tangent line (such as the dotted line TL2) on the side of the second transition section 1332 facing the recessed area 135 and the vibration direction of the transducer device 12 may gradually decrease, so that the recessed area 135 can be recessed toward the rear cavity 112. Further, the angle between the tangent line (such as the dotted line TL3) on the side of the third transition section 1333 facing the recessed area 135 and the vibration direction of the transducer device 12 may remain unchanged or gradually increase; similarly, the angle between the tangent line (such as the dotted line TL4) on the side of the fourth transition section 1334 facing the recessed area 135 and the vibration direction of the transducer device 12 may remain unchanged or gradually increase. At this time, the fifth transition section 1335 may be provided in an arc shape.

[0079] Exemplarily, the fifth transition section 1335 may be provided in a circular arc shape, and the radius of the circular arc may be greater than or equal to 0.2 mm. Among them, in combination with Figure 6 (a) or (b) in, the angle between the tangent line on the side of the third transition section 1333 facing the recessed area 135 and the vibration direction of the transducer device 12 may be zero; similarly, the angle between the tangent line on the side of the fourth transition section 1334 facing the recessed area 135 and the vibration direction of the transducer device 12 may be zero. At this time, the radius of the circular arc of the fifth transition section 1335 may be equal to half of the half-depth width W1 of the recessed area 135. Of course, in combination with Figure 6In (c) or (d), the angle between the tangent line of the third transition section 1333 facing the recessed area 135 and the vibration direction of the transducer device 12 can be zero; while the angle between the tangent line of the fourth transition section 1334 facing the recessed area 135 and the vibration direction of the transducer device 12 can be a fixed value greater than zero. At this time, the fourth transition section 1334 can be tangent to the fifth transition section 1335.

[0080] Furthermore, the projection length of the first transition section 1331 in the direction perpendicular to the vibration direction of the transducer device 12 can be defined as W3, the projection length of the second transition section 1332 in the aforementioned perpendicular direction can be defined as W4, and the projection length of the fifth transition section 1335 in the aforementioned perpendicular direction can be defined as W5, where 0.4 ≤ (W3 + W4) / W5 ≤ 2.5.

[0081] Exemplarily, the first transition section 1331 and the second transition section 1332 can be respectively arranged in an arc shape. Among them, the arc radius R1 of the first transition section 1331 can be greater than or equal to 0.2 mm, and the arc radius R2 of the second transition section 1332 can be greater than or equal to 0.3 mm to avoid excessive local bending of the folded portion 133, thereby increasing the reliability of the diaphragm 13. Of course, in some other embodiments, the first transition section 1331 can include an arc section and a flat section connected to each other, the aforementioned arc section is connected to the third transition section 1333, and the aforementioned flat section is connected to the first connecting portion 132; the second transition section 1332 can also be similar to the first transition section 1331.

[0082] Based on the above detailed description, and in combination with Figure 7 , the thickness of the diaphragm body 131 can be 0.1 mm. Among them, optionally W1 ≥ 0.9 mm, optionally 0.3 mm ≤ H ≤ 1.0 mm; optionally W3 + W4 ≥ 0.3 mm. Further, when 0.3 mm ≤ W3 + W4 ≤ 1.0 mm, optionally W2 or W5 ≥ 0.4 mm; when 0.4 mm ≤ W3 + W4 ≤ 0.7 mm, optionally W2 or W5 ≥ 0.5 mm. In a specific embodiment, W2 or W5 = 0.4 mm, W3 = 0.42 mm, W4 = 0.45 mm; H = 0.55 mm.

[0083] Combined with Figure 7 and Figure 5, in the vibration direction of the transducer device 12, the distance from the connection point (such as point 7A) between the corrugated portion 133 and the first connection portion 132 to the outer end face of the magnetic circuit system 122 away from the front cavity 111 can be defined as d1, and the distance from the central region of the spring piece 124 to the outer end face of the magnetic circuit system 122 away from the front cavity 111 can be defined as d2, where 0.3 ≤ d1 / d2 ≤ 0.8. At this time, since the magnitude of the distance d2 can be relatively determined, the magnitude of the distance d1 can be adjusted based on the distance d2, so as to facilitate the adjustment of the specific position where the corrugated portion 133 is connected to the first connection portion 132. Further, the distance from the geometric center (such as point G) of the magnet 1222 to the outer end face of the magnetic circuit system 122 away from the front cavity 111 can be defined as d3, where 0.7 ≤ d1 / d3 ≤ 2. At this time, since the magnitude of the distance d3 can be relatively determined, the magnitude of the distance d1 can also be adjusted based on the distance d3, so as to facilitate the adjustment of the specific position where the corrugated portion 133 is connected to the first connection portion 132. In this way, one end of the magnetic circuit system 122 can be connected to the movement housing 11 through the spring piece 124 and the coil bracket 121, and the other end can be connected to the movement housing 11 through the diaphragm 13, that is, the spring piece 124 and the diaphragm 13 can respectively fix both ends of the magnetic circuit system 122 on the movement housing 11 in the vibration direction of the transducer device 12, so that the stability of the magnetic circuit system 122 can be greatly improved.

[0084] Exemplarily, d1 ≥ d3, so that in the vibration direction of the transducer device 12, combined with Figure 2 , the sound outlet hole 113 can be at least partially located between the above connection point and the above outer end face. In this way, while increasing the stability of the magnetic circuit system 122 as much as possible, enough volume can be left for the rear cavity 112 as much as possible to increase the acoustic performance of the movement module 10, and enough design space can also be given to the position and size of the sound outlet hole 113 on the movement housing 11, so as to facilitate the flexible setting of the sound outlet hole 113.

[0085] Based on the above related description, and combined with Figure 5 , taking the side of the bottom plate 1223 facing away from the cylindrical side plate 1224 as a reference benchmark, the distance d1 can also be regarded as the distance between the second connection portion 134 and the bottom plate 1223, the distance d2 can also be regarded as the distance between the spring piece 124 and the bottom plate 1223, and the distance d3 can also be regarded as the distance between the geometric center of the magnet 1222 and the bottom plate 1223. In a specific embodiment, optionally d1 = 2.85 mm, d2 = 4.63 mm, d3 = 1.78 mm.

[0086] Further, the distance between the projections of the connection point between the first connection portion 132 and the corrugated portion 133 (such as point 7A) and the connection point between the second connection portion 134 and the corrugated portion 133 (such as point 7B) in the vibration direction of the transducer device 12 can be defined as d4, where 0 ≤ d4 / W2 ≤ 1.8. At this time, the specific position where the corrugated portion 133 is connected to the first connection portion 132 can also be adjusted. Among them, combining Figure 6 with (a) or (c) in [reference], the projections of the connection point between the first connection portion 132 and the corrugated portion 133 and the connection point between the second connection portion 134 and the corrugated portion 133 in the vibration direction of the transducer device 12 can coincide, that is, d4 = 0. Of course, combining Figure 6 with (b) or (d) in [reference], the projections of the connection point between the first connection portion 132 and the corrugated portion 133 (such as point 7A) and the connection point between the second connection portion 134 and the corrugated portion 133 (such as point 7B) in the vibration direction of the transducer device 12 can be offset from each other, that is, d4 > 0.

[0087] Combining Figure 8 and Figure 2 , the movement module 10 may further include an acoustic guiding component 14 connected to the movement housing 11. The acoustic guiding component 14 is provided with an acoustic guiding channel 141, and the acoustic guiding channel 141 communicates with the sound outlet hole 113 and is used to guide the above-mentioned air-conducted sound to the human ear. In other words, the acoustic guiding component 14 can be used to change the propagation path / direction of the aforementioned air-conducted sound, and thus change the directivity of the aforementioned air-conducted sound; and can be used to shorten the distance between the sound outlet hole 113 and the human ear, and thus increase the intensity of the aforementioned air-conducted sound. In addition, the acoustic guiding component 14 can also make the air-conducted sound deviate more from the rear end face (such as the area where the rear bottom plate 1151 is located) of the movement housing 11 opposite to the skin contact area, so as to improve the anti-phase cancellation of the sound at the sound outlet hole 113 caused by possible sound leakage at the rear bottom plate 1151. In this way, when the user wears the earphone 100, the user can better hear the aforementioned air-conducted sound.

[0088] Generally, in order to ensure the sound quality, the frequency response curve should be relatively flat in a relatively wide frequency band, that is, it is necessary to make the resonance peak be at a higher frequency position as much as possible. Among them, the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 has a resonance peak, and the peak resonance frequency of this resonance peak can be greater than or equal to 1 kHz; preferably, the peak resonance frequency can be greater than or equal to 2 kHz, so that the earphone 100 has a better voice output effect; more preferably, the peak resonance frequency can be greater than or equal to 3.5 kHz, so that the earphone 100 has a better music output effect; the peak resonance frequency can further be greater than or equal to 4.5 kHz.

[0089] Based on the above relevant descriptions, the sound guiding channel 141 is communicated with the rear cavity 112 through the sound outlet hole 113, and a typical Helmholtz resonance cavity structure can be formed. Among them, based on the Helmholtz resonance cavity model, the resonance frequency f and the volume V of the rear cavity 112, the cross-sectional area S of the sound guiding channel 141, the equivalent radius R and its length L can satisfy the relationship: f ∝ [S / (VL + 1.7VR)] 1 / 2 . Obviously, when the volume of the rear cavity 112 is certain, increasing the cross-sectional area of the sound guiding channel 141 and / or reducing the length of the sound guiding channel 141 are both beneficial to increasing the resonance frequency, and further making the above air-conducted sound move as much as possible towards the high frequency range.

[0090] Exemplarily, the length of the sound guiding channel 141 can be less than or equal to 7 mm. Preferably, the length of the sound guiding channel 141 can be between 2 mm and 5 mm. Among them, 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 face of the movement housing 11 departing from the above skin contact area can be greater than or equal to 3 mm, thereby avoiding the anti-phase cancellation of the leakage sound generated by the rear end face of the movement housing 11 to the air-conducted sound at the outlet end of the sound guiding channel 141.

[0091] Exemplarily, the cross-sectional area of the sound guiding channel 141 can be greater than or equal to 4.8 mm 2 . Preferably, the cross-sectional area of the sound guiding channel 141 can be greater than or equal to 8 mm 2 . Further, in combination with Figure 2 , the cross-sectional area of the sound guiding channel 141 can gradually increase along the transmission direction of the above air-conducted sound (that is, in the direction away from the sound outlet hole 113), so that the sound guiding channel 141 can be arranged in a horn shape; and can extend towards the front housing 116 to facilitate guiding the above air-conducted sound. Among them, the cross-sectional area of the inlet end of the sound guiding channel 141 can be greater than or equal to 10 mm 2 ; or, the cross-sectional area of the outlet end of the sound guiding channel 141 can be greater than or equal to 15 mm 2 .

[0092] Exemplarily, the ratio between the volume of the sound guiding channel 141 and the volume of the rear cavity 112 can be between 0.05 and 0.9. Among them, the volume of the rear cavity 112 can be less than or equal to 400 mm 3 . Preferably, the volume of the rear cavity 112 can be between 200 mm 3 and 400 mm 3 .

[0093] In a specific embodiment, the sound guiding channel 141 can be arranged in a horn shape. Among them, the length of the sound guiding channel 141 can be 2.5 mm, and the cross-sectional areas of the inlet end and the outlet end of the sound guiding channel 141 can be 15 mm 2 and 25.3 mm 2 . Further, the volume of the rear cavity 112 can be 350 mm 3 .

[0094] Combined with Figure 8 , Figure 8 , (a) to (e) in Figure 8 mainly show various structural deformations of the sound guiding component 14. The main difference between them lies in the specific structure of the sound guiding channel 141. Among them, for Figure 8 , (a) to (c) in

[0095] , the sound guiding channel 141 can be simply regarded as being arranged in a bent manner; while for Figure 8 , (d) to (e) in

[0096] , the sound guiding channel 141 can be simply regarded as being arranged in a straight-through manner. Obviously, the above-mentioned air-conducted sound will have certain differences with the structural differences of the sound guiding channel 141. Specifically: Figure 8 , for (a) in

[0097] , the sound emitting direction of the sound guiding channel 141 points to the user's face, and can increase the distance from the outlet end of the sound guiding channel 141 to the above-mentioned rear end face, thereby optimizing the directivity and intensity of the above-mentioned air-conducted sound. Figure 8 , for (b) in

[0098] , the sound emitting direction of the sound guiding channel 141 points to the user's auricle, making the above-mentioned air-conducted sound easier to be collected by the auricle and enter the ear canal, thereby optimizing the intensity of the aforementioned air-conducted sound. Figure 8 , for (c) in

[0099] , the sound emitting direction of the sound guiding channel 141 also points to the user's ear canal, and can also optimize the intensity of the aforementioned air-conducted sound. At the same time, the outlet end of the sound guiding channel 141 adopts an inclined outlet method. The inclined outlet makes the actual area of the outlet end of the sound guiding channel 141 not 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 above-mentioned air-conducted sound. Figure 8 , for (d) in

[0100] It should be noted that: the cross-sectional area at a certain point of the sound guiding channel 141 refers to the minimum area that can be intercepted when the sound guiding channel 141 is intercepted at this point. Further, a straight-through sound guiding channel means that the entire other end can be observed from either the inlet end or the outlet end of the sound guiding channel 141. At this time, for example Figure 8 For the straight-through sound guiding channel shown in (d) to (e) in, the length of the sound guiding channel 141 can be calculated in the following way: first determine the geometric center of the inlet end of the sound guiding channel 141 (such as point 8A) and the geometric center of its outlet end (such as point 8B); then connect the aforementioned geometric centers to form a line segment 8A-8B, and the length of this line segment can be simply regarded as the length of the sound guiding channel 141. Correspondingly, a bent sound guiding channel means that the other end cannot be observed from either the inlet end or the outlet end of the sound guiding channel 141, or only a part of the other end can be observed. At this time, for example Figure 8 For the bent sound guiding channel shown in (a) to (c) in, the bent sound guiding channel can be divided into two or more straight-through sub-guiding channels, and the sum of the lengths of the straight-through sub-guiding channels is used as the length of the bent sound guiding channel. For example: in Figure 8 In (a) to (c), further determine the geometric centers of the planes where the intermediate bends are located (such as points 8C1, 8C2), and then connect the aforementioned geometric centers to form a line segment 8A-8C1-8B (or 8A-8C1-8C2-8B), and the length of this line segment can be simply regarded as the length of the sound guiding channel 141.

[0101] Combined with Figure 2 , generally a sound resistance net 140 is provided at the outlet end of the sound guiding channel 141, which can be used to adjust the sound resistance of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113, so as to weaken the peak resonance frequency of the resonance peak of the aforementioned air-conducted sound in the mid-high frequency band or high frequency band, make the frequency response curve smoother, and the sound listening effect better; it can also separate the rear cavity 112 from the outside to a certain extent, so as to improve the waterproof and dustproof performance of the movement module 10. Among them, the sound resistance of the sound resistance net 140 can be less than or equal to 260 MKSrayls. Specifically, the porosity of the sound resistance net 140 can be greater than or equal to 13%; and / or, the pore size can be greater than or equal to 18 μm.

[0102] As an example, combined with Figure 9, the acoustic resistance net 140 can be woven from yarn wires. Factors such as the wire diameter and density of the yarn wires will affect the acoustic resistance of the acoustic resistance net 140. Based on this, every four mutually intersecting yarn wires among multiple longitudinally and transversely spaced yarn wires can enclose a pore. Among them, the area of the region enclosed by the centerlines of the yarn wires can be defined as S1, and the area of the region actually enclosed by the edges of the yarn wires (i.e., the pore) can be defined as S2; then the porosity can be defined as S2 / S1. Further, the pore size can be expressed as the spacing between any two adjacent yarn wires, such as the side length of the pore.

[0103] Further, the effective area of a certain specific through-hole or opening introduced hereinafter in this application can be defined as the product of its actual area and the porosity of the covered acoustic resistance net. For example: when the outlet end of the sound guiding channel 141 is covered with the acoustic resistance net 140, the effective area of the outlet end of the sound guiding channel 141 is the product of the actual area of the outlet end of the sound guiding channel 141 and the porosity of the acoustic resistance net 140; and when the outlet end of the sound guiding channel 141 is not covered with the acoustic resistance net 140, the effective area of the outlet end of the sound guiding channel 141 is the actual area of the outlet end of the sound guiding channel 141. Similarly, the effective areas of the outlet ends of through-holes such as the pressure relief hole and the sound adjustment hole mentioned hereinafter can also be respectively defined as the product of the actual area and the corresponding porosity, which will not be elaborated here.

[0104] Based on the above related descriptions, in addition to hearing the bone conduction sound, the user mainly hears the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113 and the sound guiding channel 141, rather than the air conduction sound output to the outside of the earphone 100 through the pressure relief hole 114. Therefore, the effective area of the outlet end of the sound guiding channel 141 can be designed to be larger than that of the pressure relief hole 114.

[0105] Further, the size of the pressure relief hole 114 will affect the smoothness of the exhaust of the front cavity 111, affect the ease of vibration of the diaphragm 13, and further affect the acoustic expressiveness of the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113. Therefore, when the effective area of the outlet end of the sound guiding channel 141 is certain, for example, the actual area of the outlet end of the sound guiding channel 141 and / or the porosity of the acoustic resistance net 140 is certain, combined with the following table, by adjusting the effective area of the outlet end of the pressure relief hole 114, such as the actual area of the outlet end of the pressure relief hole 114 and / or the acoustic resistance of the acoustic resistance net 1140 covered thereon, the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113 can be changed. Among them, in this application, an acoustic resistance of 0 can be simply regarded as not being covered with an acoustic resistance net.

[0106] Frequency response curve <![CDATA[Actual area / mm 2 > Acoustic resistance / MKS rayls Porosity 10-1 31.57 0 100％ 10-2 2.76 0 100％ 10-3 2.76 1000 3％

[0107] Combined with Figure 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, and the peak resonance intensity in the low-frequency band or the mid-low frequency band increases significantly; as a sound resistance 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, causing the mid-low frequency of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 to decrease, and the frequency response curve to be relatively flat.

[0108] Combined with the following table, by adjusting the actual area of the outlet end of the pressure relief hole 114 and the sound resistance of the sound resistance net 1140 provided on it, combinations of pressure relief holes 114 of different sizes and sound resistance nets 1140 of different sound resistances can be achieved, so that the frequency response curves of the air-conducted sounds output to the outside of the earphone 100 through the sound outlet hole 113 are generally the same. Among them, if the sound resistance net 1140 with a porosity of 14% can be simply regarded as a single-layer net, then the sound resistance net 1140 with a porosity of 7% can be simply regarded as a double-layer net.

[0109]

[0110] Combined with Figure 11 , the larger the actual area of the outlet end of the pressure relief hole 114, the greater the sound resistance of the corresponding sound resistance net should be, so that the effective area of the outlet end of the pressure relief hole 114 can be generally kept the same, making the exhaust smoothness of the front cavity 111 generally the same, and then making the frequency response curves of the air-conducted sounds output to the outside of the earphone 100 through the sound outlet hole 113 generally the same. However, combined with Figure 12 , although the frequency response curves of the air-conducted sounds output to the outside of the earphone 100 through the sound outlet hole 113 are generally the same, the frequency response curves of the air-conducted sounds output to the outside of the earphone 100 through the pressure relief hole 114 are different, that is, the sound leakage at the pressure relief hole 114 is different. Among them, as the actual area of the outlet end of the pressure relief hole 114 and the sound resistance of the sound resistance net 1140 increase, the overall frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the pressure relief hole 114 moves downward, that is, the sound leakage at the pressure relief hole 114 weakens accordingly. In other words, on the premise of ensuring that the frequency response curve of the air-conducted sound at the sound guiding component 14 remains generally unchanged, the size of the pressure relief hole 114 can be increased as much as possible, and at the same time, the sound resistance of the sound resistance net 1140 on the pressure relief hole 114 can be increased to make the sound leakage at the pressure relief hole 114 as small as possible. Thus, it can be seen that on the premise that the effective area of the outlet end of the pressure relief hole 114 is less than or equal to 2.76 mm 2 , the sound leakage at the pressure relief hole 114 can be reduced by increasing the actual area of the outlet end of the pressure relief hole 114 and the porosity of the sound resistance net 1140.

[0111] It should be noted that: due to the limited size of the movement housing 11, a single pressure relief hole 114 cannot be too large. Based on this, the pressure relief hole 114 can be set to at least one or at least two, for example, three described below.

[0112] Based on the above detailed description, the effective area of the outlet end of the sound guiding channel 141 can be greater than the effective area of the outlet end of each pressure relief hole 114, so that the user can hear the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113. Among them, based on the definition of the effective area, the actual area of the outlet end of the sound guiding channel 141 can be greater 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 guiding channel 141 can be greater than or equal to the sum of the effective areas of the outlet ends of all the pressure relief holes 114. Among them, 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 guiding channel 141 can be greater than or equal to 0.15. As an example, the effective area of the outlet end of the comprehensive pressure relief hole 114 can be greater than or equal to 2.5mm 2 . Thus, to ensure the smooth exhaust of the front cavity 111, and further facilitate improving the acoustic performance of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113, and reducing the sound leakage at the pressure relief hole 114.

[0113] As an example, the actual area of the outlet end of the sound guiding channel 141 can be greater than or equal to 4.8mm 2 . Preferably, the actual area of the outlet end of the sound guiding channel 141 can be greater than or equal to 8mm 2 . Correspondingly, the sum of the actual areas of the outlet ends of all the pressure relief holes 114 can be greater than or equal to 2.6mm 2 . Preferably, the sum of the actual areas of the outlet ends of all the pressure relief holes 114 can be greater than or equal to 10mm 2 . Among them, when the number of the pressure relief holes 114 is one, the sum of the actual areas of the outlet ends of all the pressure relief holes 114 is also the actual area of the outlet end of one pressure relief hole 114; the same applies to the sound tuning hole 117. In a specific embodiment, the actual area of the outlet end of the sound guiding channel 141 can be 25.3mm 2 ; three pressure relief holes 114 can be provided, such as the first pressure relief hole 1141, the second pressure relief hole 1142, and the third pressure relief hole 1143 mentioned later, and the actual areas of their outlet ends can be 11.4mm 2 , 8.4mm 2 , 5.8mm 2 .

[0114] Further, a sound resistance net 140 can be covered on the outlet end of the sound guiding channel 141, and a sound resistance net 1140 can be covered on the outlet ends of at least some of the pressure relief holes 114. Among them, the porosity of the sound resistance net 1140 can be less than or equal to the porosity of the sound resistance net 140. In a specific embodiment, the porosity of the sound resistance net 140 can be greater than or equal to 13%, and the porosity of the sound resistance net 1140 can be greater than or equal to 7%.

[0115] Based on the above related description, the sound guiding channel 141 communicates with the rear cavity 112 through the sound outlet hole 113, and can form a typical Helmholtz resonance cavity structure, and has a resonance peak. We can study the distribution of the sound pressure in the rear cavity 112 when the Helmholtz resonance cavity structure resonates. Among them, combined with Figure 13 in (a), a high-pressure area far from the sound outlet hole 113 and a low-pressure area close to the sound outlet hole 113 will be formed in the rear cavity 112. Further, when the Helmholtz resonance cavity structure resonates, it can be considered that standing waves appear in the rear cavity 112. Among them, 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 area and the high-pressure area, the longer the wavelength of the standing wave, resulting in a lower resonance frequency of the Helmholtz resonance cavity structure. Based on this, combined with Figure 13 in (b), by destroying the high-pressure area, for example, by providing a through hole communicating with the rear cavity 112 in the high-pressure area, the sound that was originally reflected in the high-pressure area cannot be reflected, and thus the aforementioned standing wave cannot be formed. At this time, when the Helmholtz resonance cavity structure resonates, the high-pressure area in the rear cavity 112 will move inward towards the low-pressure area, making the wavelength of the standing wave shorter, and thus increasing the resonance frequency of the Helmholtz resonance cavity structure.

[0116] Combined with Figure 2 , the movement mechanism housing 11 can also be provided with a sound tuning hole 117 communicating with the rear cavity 112. Among them, under the same conditions, setting the sound tuning hole 117 in the high-pressure area in the rear cavity 112 can most effectively destroy the high-pressure area. Of course, the sound tuning hole 117 can also be in any area between the high-pressure area and the low-pressure area in the rear cavity 112. As an example, the sound tuning hole 117 can be provided on the rear shell 115, and can be disposed opposite to the sound outlet hole 113 and its sound guiding component 14 on both sides of the transducer device 12.

[0117] Further, combined with Figure 14 , the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 has a resonance peak. Combining the following table, when the sound resistance net is not covered, by adjusting the actual area of the outlet end of the sound tuning hole 117, the degree of damage to the above high-pressure area by the sound tuning hole can be controlled, and thus the peak resonance frequency of the resonance peak can be adjusted. Among them, the actual area of the outlet end of the sound tuning hole 117 being 0 can be regarded as the sound tuning hole 117 being in a closed state.

[0118] Frequency response curve <![CDATA[Actual area / mm 2 > 14-1 0 14-2 1.7 14-3 2.8 14-4 28.44

[0119] Combined with Figure 14, the larger the actual area of the outlet end of the sound tuning hole 117, the more obvious the destructive effect on the above-mentioned high-pressure area, and the relatively higher the peak resonance frequency of the resonance peak. Among them, the peak resonance frequency of the resonance peak when the sound tuning hole 117 is in the open state is shifted to a higher frequency compared with the peak resonance frequency of the resonance peak when the sound tuning hole 117 is in the closed state, and the shift amount can be greater than or equal to 500 Hz. Preferably, the aforementioned shift amount is greater than or equal to 1 kHz. Further, the peak resonance frequency of the resonance peak when the sound tuning hole 117 is in the open state can be greater than or equal to 2 kHz, so that the earphone 100 has a better voice output effect. Preferably, the peak resonance frequency can be greater than or equal to 3.5 kHz, so that the earphone 100 has a better music output effect; the peak resonance frequency can further be greater than or equal to 4.5 kHz.

[0120] It should be noted that: due to the limited size of the movement housing 11, a single sound tuning hole 117 cannot be too large. Based on this, the sound tuning hole 117 can be set to at least one, for example, two as described below.

[0121] Similarly, in addition to hearing the bone conduction sound, the user mainly hears the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113, rather than the air conduction sound output to the outside of the earphone 100 through the sound tuning hole 117. Therefore, the effective area of the outlet end of the sound guiding channel 141 can be designed to be larger than that of the sound tuning hole 117.

[0122] Combined with Figure 14 and Figure 13 , since the sound tuning hole 117 is added to the rear cavity 112, part of the sound leaks out from the sound tuning hole 117, that is, sound leakage is formed at the sound tuning hole 117, resulting in the overall downward shift of the frequency response curve of the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113. For this reason, combined with Figure 2 , at least part of the outlet end of the sound tuning hole 117 can be covered with a sound resistance net 1170 to avoid sound leakage from the sound tuning hole 117 as much as possible while destroying the high-pressure area in the rear cavity 112. Among them, combined with the following table, adjusting the effective area of the outlet end of the sound tuning hole 117, such as the actual area of the outlet end of the sound tuning hole 117 and / or the sound resistance of the sound resistance net 1170 covered thereon, can make the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113 change.

[0123] Frequency response curve Acoustic resistance / MKS rayls 15-1 Un-tuned sound hole 15-2 0 15-3 145

[0124] Combined with Figure 15, a sound resistance net 1170 is added to the outlet end of the sound tuning hole 117, which can not only ensure that there is no significant reflected sound at the sound tuning hole 117 in the rear cavity 112 (that is, no standing wave and non-rigid sound field boundary), making the high-pressure area in the rear cavity 112 move inwards; but also can, to a certain extent, prevent sound from leaking out through the sound tuning hole 117, so that more sound can be output to the outside of the earphone 100 through the sound outlet hole 113. Further, the peak resonance intensity in the mid-low frequency band increases significantly, and the volume of the air-conducted sound increases; the peak resonance intensity in the high-frequency band also decreases to a certain extent, making the frequency response curve flatter in the high-frequency band and the high-frequency sound quality more balanced.

[0125] Based on the above detailed description, the effective area of the outlet end of the sound guiding channel 141 can be larger than the effective area of the outlet end of each sound tuning hole 117, so as to facilitate the user to hear the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113. Among them, based on the definition of the effective area, the actual area of the outlet end of the sound guiding channel 141 can be larger than the actual area of the outlet end of each sound tuning hole 117. Further, the effective area of the outlet end of the sound guiding channel 141 can be larger than the sum of the effective areas of the outlet ends of all the sound tuning holes 117. Among them, the ratio between the sum of the effective areas of the outlet ends of all the sound tuning holes 117 and the effective area of the outlet end of the sound guiding channel 141 can be greater than or equal to 0.08. As an example, the sum of the effective areas of the outlet ends of all the sound tuning holes 117 can be greater than or equal to 1.5mm 2 . Among them, when the number of the sound tuning holes 117 is one, the sum of the effective areas of the outlet ends of all the sound tuning holes 117 is also the effective area of the outlet end of one sound tuning hole 117; the same applies to the pressure relief hole 114. In this way, not only can the peak resonance frequency of the resonance peak of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 be shifted as much as possible to the high frequency, but also the sound leakage at the sound tuning hole 117 can be reduced.

[0126] As an example, the sum of the actual areas of the outlet ends of all the sound tuning holes 117 can be greater than or equal to 5.6mm 2 . In a specific embodiment, two sound tuning holes 117 can be provided, such as the first sound tuning hole 1171 and the second sound tuning hole 1172 mentioned later, and the actual areas of their outlet ends can be 7.6mm 2 、5.6mm 2 .

[0127] Further, the outlet end of the sound guiding channel 141 can be covered with a sound resistance net 140, and at least part of the outlet ends of the sound tuning holes 117 can be covered with a sound resistance net 1170. Among them, the porosity of the sound resistance net 1170 can be less than or equal to the porosity of the sound resistance net 140. In a specific embodiment, the porosity of the sound resistance net 140 can be greater than or equal to 13%, and the porosity of the sound resistance net 1170 can be less than or equal to 16%.

[0128] Based on the above related descriptions, for the pressure relief hole 114 and the sound outlet hole 113, the phases of the air-conducted sounds output to the outside of the earphone 100 through the two are opposite to each other, so that the pressure relief hole 114 and the sound outlet hole 113 should be staggered as much as possible in three-dimensional space to avoid the coherent cancellation of the air-conducted sounds output to the outside of the earphone 100 through the two. For this reason, the pressure relief hole 114 is as far away from the sound outlet hole 113 as possible. For the sound tuning hole 117 and the sound outlet hole 113, if the area where the sound outlet hole 113 is located can be simply regarded as a low-pressure area in the rear cavity 112, then the area farthest from the area where the sound outlet hole 113 is located in the rear cavity 112 can be simply regarded as a high-pressure area in the rear cavity 112; and the sound tuning hole 117 can be preferably arranged in the high-pressure area in the rear cavity 112 to destroy the original high-pressure area and make it move towards the low-pressure area. For this reason, the sound tuning hole 117 is as far away from the sound outlet hole 113 as possible.

[0129] Furthermore, since the pressure relief hole 114 communicates with the front cavity 111 and the sound tuning hole 117 communicates with the rear cavity 112, the phases of the air-conducted sounds output to the outside of the earphone 100 through the pressure relief hole 114 and the sound tuning hole 117 are opposite to each other. Therefore, the leakage sound from the pressure relief hole 114 and the sound tuning hole 117 can be reduced by means of coherent cancellation. Based on this, at least part of the pressure relief holes 114 and at least part of the sound tuning holes 117 can be arranged adjacent to each other respectively to create conditions for coherent cancellation. Among them, in order to better make the leakage sounds of the pressure relief hole 114 and the sound tuning hole 117 cancel each other coherently, the distance between the two should be as small as possible. For example, the minimum distance between the outlines of the outlet ends of the pressure relief hole 114 and the sound tuning hole 117 is less than or equal to 2 mm. In addition, the peak resonance frequency and / or peak resonance intensity of the resonance peaks of the air-conducted sounds output to the outside of the earphone 100 through the pressure relief hole 114 and the sound tuning hole 117 should also be as matched as possible. However, in the actual product design, affected by the specific structure and process tolerance, it is generally difficult to control the peak resonance frequency and / or peak resonance intensity of the resonance peaks of the above two paths of air-conducted sounds to be exactly the same. Therefore, in the design, it should be ensured as much as possible that the peak resonance frequency and / or peak resonance intensity of the resonance peaks of the above two paths of air-conducted sounds do not differ too much.

[0130] Combined with Figure 16, the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the pressure relief hole 114 has a first resonance peak f1, and the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the sound tuning hole 117 has a second resonance peak f2. Among them, combined with the following table, the peak resonance frequencies of the first resonance peak and the second resonance peak can be greater than or equal to 2 kHz respectively, and |f1 - f2| / f1 ≤ 60%. As the difference between the peak resonance frequencies of the first resonance peak and the second resonance peak gradually decreases, the wider the frequency bandwidth of leakage reduction can be achieved, that is, the frequency response curve becomes relatively flatter, indicating that the leakage of the earphone 100 is reduced more, that is, the effect of coherent cancellation of the air-conducted sounds output to the outside of the earphone 100 through the pressure relief hole 114 and the sound tuning hole 117 respectively is better. Preferably, the peak resonance frequencies of the first resonance peak and the second resonance peak can be greater than or equal to 3.5 kHz respectively, and |f1 - f2| ≤ 2 kHz. In this way, the air-conducted sounds output to the outside of the earphone 100 through the pressure relief hole 114 and the sound tuning hole 117 respectively can be coherently cancelled as much as possible in the high-frequency band.

[0131] Frequency response curve Peak resonance frequency of f1 / Hz Peak resonance frequency of f2 / Hz 16-1 3500 5600 16-2 4500 5600 16-3 5000 5600

[0132] Furthermore, since structural components such as the coil bracket 121 and the spring piece 124 are provided in the front cavity 111, the wavelength of the standing wave in the front cavity 111 is relatively long; the sound tuning hole 117 and the sound outlet hole 113 can destroy each other's high-pressure areas, making the wavelength of the standing wave in the rear cavity 112 relatively short. In this way, the peak resonance frequency of the first resonance peak is generally less than the peak resonance frequency of the second resonance peak. In order to make the air-conducted sounds output to the outside of the earphone 100 through the pressure relief hole 114 and the sound tuning hole 117 cancel each other out better, the peak resonance frequency of the first resonance peak should be shifted as much as possible to the high frequency to be as close as possible to the peak resonance frequency of the second resonance peak. For this purpose, based on the Helmholtz resonance cavity model, the effective area of the outlet end of the pressure relief hole 114 in the adjacent pressure relief hole 114 and sound tuning hole 117 can be larger than the effective area of the outlet end of the sound tuning hole 117. Among them, 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 tuning hole 117 in the adjacent pressure relief hole 114 and sound tuning hole 117 can 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 pressure relief hole 114 and sound tuning hole 117 can be larger than the actual area of the outlet end of the sound tuning hole 117. Further, the outlet ends of the adjacent pressure relief hole 114 and sound tuning hole 117 can be respectively covered with a sound resistance net 1140 and a sound resistance net 1170, and the porosity of the sound resistance net 1140 can be greater than the porosity of the sound resistance net 1170.

[0133] Combined with Figure 17In (a), the pressure relief hole 114 may include a first pressure relief hole 1141 and a second pressure relief hole 1142. Among them, the first pressure relief hole 1141 may be disposed farther from the sound outlet hole 113 than the second pressure relief hole 1142. At this time, the effective area of the outlet end of the first pressure relief hole 1141 may be larger than the effective area of the outlet end of the second pressure relief hole 1142. In this way, both the size of the movement housing 11 and the exhaust requirement of the front cavity 111 can be taken into account, and the first pressure relief hole 1141 with a relatively large exhaust volume can be made as far away from the sound outlet hole 113 as possible, thereby reducing the influence of sound leakage at the pressure relief hole 114 on the air-conducted sound at the sound outlet hole 113. Further, the pressure relief hole 114 may further include a third pressure relief hole 1143, and the first pressure relief hole 1141 may also be disposed farther from the sound outlet hole 113 than the third pressure relief hole 1143. Among them, 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 third pressure relief hole 1143.

[0134] Exemplarily, in combination with Figure 17 in (a) and Figure 2 , the sound outlet hole 113 and the first pressure relief hole 1141 may be located on opposite sides of the transducer device 12; while the second pressure relief hole 1142 and the third pressure relief hole 1143 may be disposed opposite to each other and may be located between the sound outlet hole 113 and the first pressure relief hole 1141.

[0135] Further, at least a part of the outlet ends of the pressure relief holes 114 may be covered with a sound resistance net 1140 to facilitate adjusting the effective area of the outlet ends of the pressure relief holes 114. Among them, in this embodiment, an example is given in which the outlet ends of the pressure relief holes 114 are respectively covered with sound resistance nets 1140 having the same sound resistance for exemplary illustration. In this way, not only the acoustic performance and the waterproof and dustproof performance of the earphone 100 can be improved, but also the mixing of the sound resistance nets 1140 due to too many specifications and types can be avoided. Based on this, the corresponding effective area can be obtained by adjusting the actual area of the outlet ends of the pressure relief holes 114. For example: the actual area of the outlet end of the first pressure relief hole 1141 may be larger than the actual area of the outlet end of the second pressure relief hole 1142, and the actual area of the outlet end of the second pressure relief hole 1142 may also be larger than the actual area of the outlet end of the third pressure relief hole 1143.

[0136] In combination with Figure 17In Figure (b), the sound adjustment hole 117 may include a first sound adjustment hole 1171 and a second sound adjustment hole 1172. Among them, the first sound adjustment hole 1171 may be arranged farther away from the sound outlet hole 113 than the second sound adjustment hole 1172. At this time, the effective area of the outlet end of the first sound adjustment hole 1171 may be larger than the effective area of the outlet end of the second sound adjustment hole 1172, so as to break the high-pressure area in the rear cavity 112. In this way, both the size of the movement housing 11 and the requirement of the sound adjustment hole 117 to break the high-pressure area in the rear cavity 112 can be taken into account, and the resonance frequency of the air-conducted sound at the sound outlet hole 113 can be made as high as possible. Moreover, the first sound adjustment hole 1171 with a relatively large degree of damage can be made as far away from the sound outlet hole 113 as possible.

[0137] As an example, in combination with Figure 17 Figure (b) and Figure 2 , the sound outlet hole 113 and the first sound adjustment hole 1171 may be located on opposite sides of the transducer device 12; and the second sound adjustment hole 1172 may be located between the sound outlet hole 113 and the first sound adjustment hole 1171.

[0138] Furthermore, at least part of the outlet end covers of the sound adjustment hole 117 may be provided with a sound resistance net 1170 to facilitate adjusting the effective area of the outlet end of the sound adjustment hole 117. Among them, in this embodiment, an example is given by taking the outlet ends of the sound adjustment hole 117 as being respectively covered with sound resistance nets 1170 having the same sound resistance. In this way, not only can the acoustic performance and the waterproof and dustproof performance of the earphone 100 be improved, but also the mixing of materials due to too many specifications and types of the sound resistance net 1170 can be avoided. Based on this, the corresponding effective area can be obtained by adjusting the actual area of the outlet end of the sound adjustment hole 117. For example: the actual area of the outlet end of the first sound adjustment hole 1171 may be larger than the actual area of the outlet end of the second sound adjustment hole 1172. Specifically, the actual area of the outlet end of the first sound adjustment hole 1171 may be greater than or equal to 3.8 mm 2 ; and / or, the actual area of the outlet end of the second sound adjustment hole 1172 may be greater than or equal to 2.8 mm 2 .

[0139] As an example, in combination with Figure 17 Figure (c) and (d), the first pressure relief hole 1141 and the first sound adjustment hole 1171 may be adjacently arranged, and the second pressure relief hole 1142 and the second sound adjustment hole 1172 may also be adjacently arranged. In this way, the air-conducted sounds respectively output to the outside of the earphone 100 through the first pressure relief hole 1141 and the first sound adjustment hole 1171 can be coherently cancelled out, and the air-conducted sounds respectively output to the outside of the earphone 100 through the second pressure relief hole 1142 and the second sound adjustment hole 1172 can also be coherently cancelled out.

[0140] Further, the effective area of the outlet end of the first pressure relief hole 1141 can be larger than the effective area of the outlet end of the first sound tuning hole 1171, so that the peak resonance frequency of the air-conducted sound output to the outside of the earphone 100 through the first pressure relief hole 1141 is shifted as much as possible towards the high frequency, so as to be as close as possible to the peak resonance frequency of the air-conducted sound output to the outside of the earphone 100 through the first sound tuning hole 1171, thereby enabling the air-conducted sounds output to the outside of the earphone 100 through the first pressure relief hole 1141 and the first sound tuning hole 1171 to cancel each other out better by interference. Similarly, the effective area of the outlet end of the second pressure relief hole 1142 can be larger than the effective area of the outlet end of the second sound tuning hole 1172, which will not be elaborated here.

[0141] Similar to the case where the sound tuning hole 117 destroys the high-pressure area in the rear cavity 112, the second pressure relief hole 1142 and the third pressure relief hole 1143 will destroy the high-pressure area in the front cavity 111, causing the wavelength of the standing wave in the front cavity 111 to decrease, and further enabling the peak resonance frequency of the air-conducted sound output to the outside of the earphone 100 through the first pressure relief hole 1141 to shift towards the high frequency, so as to cancel each other out better by interference with the air-conducted sound output to the outside of the earphone 100 through the first sound tuning hole 1171. Among them, the shift amount can be greater than or equal to 500 Hz, and the peak resonance frequency of the resonance peak can be greater than or equal to 2 kHz. Preferably, the shift amount is greater than or equal to 1 kHz. Similarly, the peak resonance frequency of the air-conducted sound output to the outside of the earphone 100 through the second pressure relief hole 1142 can also shift towards the high frequency. In short, the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the pressure relief hole 114 adjacent to the sound tuning hole 117 has a resonance peak, and the peak resonance frequency of the resonance peak when the other pressure relief holes 114 other than the pressure relief hole 114 adjacent to the sound tuning hole 117 are in the open state is shifted towards the high frequency compared to the peak resonance frequency of the resonance peak when the other pressure relief holes 114 are in the closed state. Among them, the peak resonance frequency of the resonance peak when the other pressure relief holes 114 are in the open state can be greater than or equal to 2 kHz.

[0142] Combined with Figure 17 and Figure 2, the movement housing 11 may include a first side wall 17A and a second side wall 17B located on opposite sides of the transducer device 12, and a third side wall 17C and a fourth side wall 17D that connect the first side wall 17A and the second side wall 17B and are spaced apart from each other. In short, the movement housing 11 can be simplified to a rectangular frame. Of course, the third side wall 17C and the fourth side wall 17D can also be arc-shaped, so that the movement housing 11 is integrally in a runway shape. Among them, 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 earhook assembly 20 than the fourth side wall 17D. Further, the sound outlet hole 113 can be provided on the first side wall 17A, so that the user can hear the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 and the sound guiding channel 141; the first pressure relief hole 1141 and the first sound tuning hole 1171 can be respectively provided on the second side wall 17B, making them respectively farther away from the sound outlet hole 113. Correspondingly, the second pressure relief hole 1142 and the second sound tuning hole 1172 can be respectively provided on one of the third side wall 17C and the fourth side wall 17D, and the third pressure relief hole 1143 can be provided on the other of the third side wall 17C and the fourth side wall 17D.

[0143] Based on the above related descriptions, and in combination with Figure 18 in (a), the discharge of the air in the front cavity 111 needs to bypass the coil assembly, and its path can be as shown by the dotted arrow in Figure 18 in (a), resulting in a relatively long wavelength of the standing wave in the front cavity 111, which is not conducive to the peak resonance frequency of the air-conducted sound output to the outside of the earphone 100 through the pressure relief hole 114 to shift to a higher frequency. For this reason, in this embodiment, a communication hole 1215 is opened on the coil assembly, so that the air in the front cavity 111 can directly pass through the coil assembly during the discharge process. Combining Figure 18 in (b), this can not only increase the discharge efficiency of the front cavity 111, but also reduce the wavelength of the standing wave in the front cavity 111, and further make the peak resonance frequency of the air-conducted sound output to the outside of the earphone 100 through the pressure relief hole 114 shift to a higher frequency.

[0144] Combining Figure 19 , the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the pressure relief hole 11 has a resonance peak. The peak resonance frequency of the resonance peak when the communication hole 1215 is in the open state is shifted to a higher frequency compared with the peak resonance frequency of the resonance peak when the communication hole 1215 is in the closed state, and the offset amount can be greater than or equal to 500 HZ. Among them, the peak resonance frequency of the resonance peak when the communication hole 1215 is in the open state can be greater than or equal to 2 kHz.

[0145] As an example, the coil assembly is arranged in the front cavity 111 and extends into the magnetic gap of the magnetic circuit system 122. The coil assembly can be arranged in a ring shape and provided with a connecting hole 1215 connecting the inside and the outside of the coil assembly. Preferably, the connecting hole 1215 can be located outside the magnetic gap of the magnetic circuit system 122 to shorten the path of the air discharge in the front cavity 111 as much as possible.

[0146] Based on the above description, combined with Figure 5 The coil assembly described in this embodiment may include a coil support 121 and a coil 123 connected to the coil support 121, wherein the coil support 121 is used to fix the coil 123 on the movement housing 11 and allow the coil 123 to extend into the magnetic gap of the magnetic circuit system 122. The connecting hole 1215 may be provided on the coil support 121. Further, the connecting hole 1215 may be located on the side of the spring sheet 124 away from the skin contact area, so as to shorten the path of the air discharged from the front cavity 111 as much as possible.

[0147] Combination Figure 20 The connecting hole 1215 can be located at the connection between the annular main body 1211 and the first cylindrical bracket part 1212. Of course, all the connecting holes 1215 can also be located at the annular main body 1211 or the first cylindrical bracket part 1212. Further, the number of connecting holes 1215 can be multiple, and they are arranged at intervals along the annular direction of the coil assembly. Among them, the cross-sectional area of each connecting hole 1215 can be greater than or equal to 2mm 2 As an example, the cross-sectional area of the connecting hole 1215 disposed adjacent to the first pressure relief hole 1141 may be greater than or equal to 3 mm. 2 The cross-sectional area of the connecting hole 1215 disposed adjacent to the second pressure relief hole 1142 and the third pressure relief hole 1143 may be greater than or equal to 2.5 mm 2 .

[0148] Based on the above description, the air vibrations in the front cavity 111 and the rear cavity 112 are in opposite phases. Based on this, the movement module 10 may further include a connecting channel connecting the front cavity 111 and the rear cavity 112, so as to destroy the high pressure area in the front cavity 111 and the rear cavity 112, increase the peak resonance frequency of the resonance peak, and thus improve the sound quality and sound leakage of the earphone 100.

[0149] As an example, in combination Figure 21In (a), the communication channel can be the micropore array 21A provided on the diaphragm 13. For example, the micropore array 21A is provided on the corrugated portion 133. Among them, at least some of the micropores in the micropore array 21A and the sound outlet hole 113 can be located on opposite sides of the transducer device 12 respectively. Of course, the micropore array 21A can also be provided on both sides of the sound outlet hole 113. Further, the actual area of each micropore in the micropore array 21A can be between 0.01 mm 2 and 0.04 mm 2 between.

[0150] Further, the micropore array 21A can also cooperate with the sound tuning hole 117 to facilitate the high-frequency shift of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113.

[0151] Combined with Figure 22 and the following table, the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 has a resonance peak, and the peak resonance frequency of the resonance peak can be greater than or equal to 2 kHz. Among them, when the communication channel is in the open state, the peak resonance frequency of the resonance peak shifts to a higher frequency compared with when the communication channel is in the closed state, and the shift amount can be greater than or equal to 500 Hz. Preferably, the shift amount can be greater than or equal to 1 kHz. At the same time, combined with Figure 23 , as the peak resonance frequency of the resonance peak shifts to a higher frequency, the leakage sound in the mid-low frequency band gradually decreases.

[0152]

[0153] Further, a sound resistance net 21D can be provided on the communication path defined by the communication channel. Among them, combined with Figure 24 and the following table, by setting the sound resistance net 21D, the high-frequency peak in the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 and the sound guiding channel 141 can be further weakened, making the frequency response curve flatter and the high-frequency sound quality more balanced. As an example, the porosity of the sound resistance net 21D can be less than or equal to 18%; and / or, the pore size can be less than or equal to 51 μm.

[0154] Frequency response curve Acoustic resistance / MKS rayls Porosity 24-1 No connected channels None 24-2 0 100％ 24-3 45 18％ 24-4 260 13％

[0155] As an example, combined with Figure 21 in (b), the communication channel can be the through hole 21B provided on the magnetic circuit system 122. Among them, the actual area of the through hole 21B can be less than or equal to 9 mm 2 .

[0156] As an example, combined with Figure 21In Fig. (c), the communication channel can be a communication pipe 21C provided outside the movement housing 11, and the communication pipe 21C is used to communicate the pressure relief hole 114 and the sound adjustment hole 117. Among them, the pressure relief hole 114 and the sound adjustment hole 117 can be arranged adjacent to each other.

[0157] Based on the above relevant descriptions, the front cavity 111 and the rear cavity 112 can be simply regarded as Helmholtz cavity structures, so that the air-conducted sounds output to the outside of the earphone 100 through the sound outlet hole 113, the pressure relief hole 114, and the sound adjustment hole 117 respectively have a resonance peak. Among them, any of the above embodiments is mainly to shift the peak resonance frequency of the resonance peak to a higher frequency to improve the sound quality and sound leakage of the earphone 100. Further, the peak resonance intensity of the air-conducted sound at the resonance peak will increase sharply, resulting in uneven sound quality. For this reason, the movement module 10 can further include a Helmholtz resonance cavity 25A communicated with the front cavity 111 and / or the rear cavity 112, so as to absorb the sound energy of the front cavity 111 and / or the rear cavity 112 near the peak resonance frequency, that is, to suppress the sudden increase of the peak resonance intensity, make the frequency response curve flatter, and thus make the sound quality more balanced.

[0158] As an example, in Figure 25 Fig. (a), the Helmholtz resonance cavity 25A can be arranged in the movement housing 11, for example, opposite to the skin contact area of the movement housing 11.

[0159] As an example, in Figure 25 Figs. (b) to (d), the Helmholtz resonance cavity 25A can be arranged in the magnetic circuit system 122, for example, arranged in the magnet 1222. Among them, since the mass of the magnetic circuit system 122 is larger than that of the movement housing 11, the amplitude of the magnetic circuit system 122 is smaller under the same driving force, especially in the medium and high frequency bands (for example, >1 kHz). In other words, during the actual operation of the earphone 100, the vibration of the magnetic circuit system 122 is significantly smaller than that of the movement housing 11. Based on this, arranging the Helmholtz resonance cavity 25A on the magnetic circuit system 122 can obtain a wall surface with smaller vibration, and its effect of absorbing sound energy and weakening the high-frequency peak is more significant.

[0160] Based on the Helmholtz cavity model, and in combination with Figure 26 , as the volume of the Helmholtz resonance cavity 25A (for example Figure 26 in Fig. C) increases, or the area of the opening through which the Helmholtz resonance cavity 25A communicates with the front cavity 111 (or the rear cavity 112) (for example Figure 26 in Fig. M) decreases, the frequency bandwidth of the Helmholtz resonance cavity 25A weakening the high-frequency resonance peak is wider, and the weakening effect is more significant.

[0161] As an example, in Figure 25In (b), the Helmholtz resonance cavity 25A can be configured to communicate with the rear cavity 112. Among them, the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 has a first resonance peak, and the Helmholtz resonance cavity 25A is configured to weaken the peak resonance intensity of the first resonance peak. Among them, the peak resonance frequency of the first resonance peak can be greater than or equal to 2 kHz. Further, in combination with Figure 26 , the difference between the peak resonance intensity of the first resonance peak when the opening of the Helmholtz resonance cavity 25A communicating with the rear cavity 112 is in the open state and the peak resonance intensity of the first resonance peak when the opening of the Helmholtz resonance cavity 25A communicating with the rear cavity 112 is in the closed state is greater than or equal to 3 dB.

[0162] As an example, in combination with Figure 25 In (c), the Helmholtz resonance cavity 25A can be configured to communicate with the front cavity 111. Among them, the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the pressure relief hole 114 has a second resonance peak, and the Helmholtz resonance cavity 25A is configured to weaken the peak resonance intensity of the second resonance peak. Among them, the peak resonance frequency of the second resonance peak can be greater than or equal to 2 kHz. Further, in combination with Figure 26 , the difference between the peak resonance intensity of the second resonance peak when the opening of the Helmholtz resonance cavity 25A communicating with the front cavity 111 is in the open state and the peak resonance intensity of the second resonance peak when the opening of the Helmholtz resonance cavity 25A communicating with the front cavity 111 is in the closed state is greater than or equal to 3 dB.

[0163] As an example, in combination with Figure 25 In (d), the Helmholtz resonance cavity 25A can be configured to communicate with both the front cavity 111 and the rear cavity 112 at the same time. Among them, the area of the opening communicating with the front cavity 111 can be greater than or equal to the area of the opening communicating with the rear cavity 112.

[0164] Further, a sound resistance net 25B can also be provided at the opening where the Helmholtz resonance cavity 25A communicates with the front cavity 111 (or the rear cavity 112). Among them, in combination with Figure 27 , as the sound resistance (such as Figure 27 R in ) of the sound resistance net 25B increases, the frequency response curve becomes flatter and the sound quality becomes more balanced. As an example, the porosity of the sound resistance net 25B can be greater than or equal to 3%.

[0165] In combination with Figure 28, the earphone 100 may include a processing circuit 28A, which may be integrated on the main control circuit board 40 and may be used to convert an audio file into a driving signal for the transducer device 12. Among them, the audio file may be transmitted to the processing circuit 28A in a wired / wireless manner. The processing circuit 28A may perform signal processing on the audio file, such as decoding, equalization, gain adjustment, etc.; the processed signal is further input to the speaker, and the speaker completes the conversion from the electrical signal to sound (such as bone conduction sound and / or air conduction sound), and then outputs the sound.

[0166] Based on the above related description, the front cavity 111 and the rear cavity 112 can be simply regarded as Helmholtz cavity structures, so that the air conduction sounds output to the outside of the earphone 100 through the sound outlet hole 113, the pressure relief hole 114, and the sound tuning hole 117 respectively have a resonance peak. Among them, any of the above embodiments is mainly to shift the peak resonance frequency of the resonance peak to a higher frequency to improve the sound quality and sound leakage of the earphone 100. Further, the peak resonance intensity of the air conduction sound at the resonance peak will increase sharply, resulting in uneven sound quality. For this reason, the processing circuit 28A may include at least one equalizer (Equalizer, EQ). The equalizer 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 weaken the signal amplitude of the relatively high frequency band, and then reduce the signal output of this frequency, weaken the sudden increase of the air conduction sound, and then make the sound quality more balanced. Of course, the sudden increase of the bone conduction sound can also be weakened to make it more balanced. Among them, when the equalizer performs gain processing on the audio file, the signal gain coefficient is represented by a positive number, and when the equalizer performs attenuation processing on the audio file, the signal gain coefficient is represented by a negative number. Further, the equalization function of the equalizer can be realized by a filter; the filter can be a single one or a module composed of multiple ones, and the filter can be an analog filter or a digital filter.

[0167] Exemplarily, the first frequency band may include at least 500 Hz.

[0168] Exemplarily, the second frequency band may include at least 3.5k or 4.5 kHz.

[0169] Exemplarily, the air conduction sound output to the outside of the earphone 100 through the sound outlet hole 113 has a resonance peak, and the peak resonance frequency of the resonance peak is within the second frequency band or higher than the second frequency band. In this way, the resonance peak is shifted as much as possible to a higher frequency, and the signal amplitude is weakened by the equalizer, thereby reducing the signal output of the second frequency, weakening the sudden increase of the air conduction sound, and making the high frequency of the sound quality more balanced.

[0170] Exemplarily, the equalizer can further set different signal gain coefficients for the first frequency band according to the volume of the earphone 100. Among them, the larger the volume, the smaller the signal gain coefficient of the first frequency band. For example, in the case of a small volume, the equalizer can make the signal gain coefficient of the low frequency larger, so that the low frequency is sufficient and full in the listening experience and the sound quality is better; while in the case of a large volume, the equalizer can make the signal gain coefficient of the low frequency smaller, so as to avoid the popping sound caused by the excessive amplitude of the speaker.

[0171] Combined with Figure 29 , the movement housing 11 can include a main housing 29A, a secondary housing 29B and an elastic connecting member 29C. Among them, the main housing 29A can be used to contact the user's skin and form a skin contact area. The transducer device 12 can be connected to the main housing 29A, and the diaphragm 13 can be connected between the transducer device 12 and the main housing 29A. At this time, the main housing 29A and the diaphragm 13 can cooperate to form a front cavity 111, and the secondary housing 29B can be connected to the main housing 29A through the elastic connecting member 29C and cooperate with the diaphragm 13 to form a rear cavity 112. Further, the vibration system formed by the secondary housing 29B and the elastic connecting member 29C has a natural frequency f0. At this time, the secondary housing 29B can be disposed opposite to the skin contact area. The magnitude of the natural frequency can be adjusted according to parameters such as the elastic coefficient of the secondary housing 29B and the elastic connecting member 29C, which is not limited here. Further, the natural frequency can be less than or equal to 2 kHz. Preferably, the natural frequency can be less than or equal to 1 kHz.

[0172] Exemplarily, combined with Figure 30 , when the vibration frequency of the main housing 29A is between 20 Hz and 150 Hz, the phase difference between the secondary housing 29B and the main housing 29A can be between -π / 3 and +π / 3. At this time, the followability of the secondary housing 29B relative to the main housing 29A is better, and the vibration of the secondary housing 29B and the skin contact area can even be in phase. The air in the rear cavity 112 can still be compressed or expanded, and thus can form an air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113. Further, when the vibration frequency of the main housing 29A is between 2 kHz and 4 kHz, the phase difference between the secondary housing 29B and the main housing 29A can be between 2π / 3 and 4π / 3. At this time, the followability of the secondary housing 29B relative to the main housing 29A is poor, and the vibration of the secondary housing 29B and the skin contact area can even be out of phase. The air in the rear cavity 112 is difficult to be compressed or expanded, and thus it is difficult to form an air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113.

[0173] In short, by reasonably designing the natural frequency of the auxiliary housing 29B, it is possible to control the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 in a certain specific frequency band (for example, <f0), and significantly reduce the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 in another frequency band (for example, >f0), so as to supplement a specific frequency band of the bone-conducted sound with the air-conducted sound.

[0174] Similarly, when the vibration frequency of the main housing 29A is between 20 Hz and 400 Hz, the phase difference between the auxiliary housing 29B and the main housing 29A can be between -π / 3 and +π / 3. Further, when the vibration frequency of the main housing 29A is between 1 kHz and 2 kHz, the phase difference between the auxiliary housing 29B and the main housing 29A can be between 2π / 3 and 4π / 3; however, this frequency band needs to avoid the natural frequency of the auxiliary housing 29B.

[0175] Based on the above related descriptions, the skin contact area of the movement housing 11 is used to contact the user's skin, so as to transmit the mechanical vibration generated by the movement module 10, and then form bone-conducted sound. Among them, when the earphone 100 generates bone-conducted sound, the transducer 12 and the movement housing 11 perform relative movement. Further, due to the presence of the diaphragm 13, in the process of the aforementioned relative movement, an air-conducted sound in the same phase as the bone-conducted sound transmitted to the human ear through the sound outlet hole 113 will also be generated in the rear cavity 112. Based on this, the mechanical properties (such as elasticity, damping, mass) of the user's skin will in turn affect the vibration state of the movement module 10. Specifically, the better and closer the movement housing 11 fits with the user's skin, the weaker the vibration of the movement housing 11 will be. Correspondingly, the weakening of the vibration of the movement housing 11 makes the relative movement between the movement housing 11, the transducer 12 and the diaphragm 13 weaker, and the air-conducted sound generated thereby also becomes smaller, ultimately affecting the listening effect of the air-conducted sound. However, the movement housing 11 cannot be completely separated from the user's skin either, because this will affect the transmission of the bone-conducted sound, and thus affect the listening effect of the bone-conducted sound. For this reason, when the earphone 100 is in a worn state, the first area 31A of the skin contact area is arranged to fit with the user's skin, while the second area 31B of the skin contact area is inclined and spaced relative to the user's skin, so as to balance the generation of the air-conducted sound and the transmission of the bone-conducted sound. Among them, the second area 31B can be farther away from the earhook assembly 20 than the first area 31A.

[0176] As an example, the inclination angle between the second area 31B and the user's skin can be between 0 degrees and 45 degrees. Preferably, the inclination angle can be between 10 degrees and 30 degrees.

[0177] Exemplarily, the first region 31A and the second region 31B can be arranged coplanarly to reduce the processing difficulty of the movement housing 11. Of course, the movement housing 11 can also be arranged in an arc shape so that the first region 31A is in contact with the user's skin while the second region 31B is inclined and spaced apart from the user's skin.

[0178] Exemplarily, the area of the second region 31B can be larger than the area of the first region 31A to ensure the generation of air-conducted sound.

[0179] Based on the above related descriptions and in combination with Figure 2 and Figure 17 , the pressure relief holes 114 can connect the front cavity 111 with the outside of the earphone 100, and the sound tuning holes 117 can connect the rear cavity 112 with the outside of the earphone 100; and at least some of the pressure relief holes 114 and at least some of the sound tuning holes 117 can also be adjacent to each other respectively, and the distance between the two can be less than or equal to 2 mm. For example, the first pressure relief hole 1141 is adjacent to the first sound tuning hole 1171, and the second pressure relief hole 1142 is adjacent to the second sound tuning hole 1172. Based on this, the movement module 10 can further include a protective cover 15, and the protective cover 15 can cover the periphery of the pressure relief holes 114 and the sound tuning holes 117. Among them, the protective cover 15 can be woven from metal wires, the wire diameter of the metal wires can be 0.1 mm, and the mesh number of the protective cover 15 can be 90 - 100, so that it has a certain structural strength and a good air permeability, which can not only prevent foreign objects from invading the inside of the movement module 10, but also not affect the acoustic performance of the earphone 100. In this way, the protective cover 15 can cover the adjacent pressure relief holes 114 and sound tuning holes 117 at the same time, that is, "one cover covers two holes", thereby greatly reducing the materials and improving the appearance quality of the earphone 100.

[0180] Exemplarily, in combination with Figure 32 , a receiving area 118 can be provided on the outer surface of the movement housing 11, and the receiving area 118 can communicate with the outlet ends of the adjacent pressure relief holes 114 and sound tuning holes 117. At this time, the protective cover 15 can be arranged in a plate shape and can be fixed in the receiving area 118 by one or a combination of connection methods such as clamping, gluing, welding, etc., for example, adhesively bonded or welded to the bottom of the receiving area 118 to cover the pressure relief holes 114 and the sound tuning holes 117. Among them, the outer surface of the protective cover 15 can be flush with the outer surface of the movement housing 11 or have an arc transition to improve the appearance quality of the earphone 100.

[0181] Further, a boss 1181 may be formed in the accommodation area 118. The boss 1181 is spaced from the side wall of the accommodation area 118 to form an accommodation groove 1182 surrounding the boss 1181. Wherein, the groove width of the accommodation groove 1182 may be less than or equal to 0.3 mm. At this time, the outlet ends of the pressure relief hole 114 and the sound adjustment hole 117 are located at the top of the boss 1181, that is, the accommodation groove 1182 can surround the pressure relief hole 114 and the sound adjustment hole 117. Correspondingly, the protective cover 15 may include a main cover plate 151 and an annular side plate 152. The annular side plate 152 is bent and connected to the edge of the main cover plate 151 to extend laterally to the main cover plate 151. Wherein, the height of the annular side plate 152 relative to the main cover plate 151 may be between 0.5 mm and 1.0 mm. Thus, when the protective cover 15 is fixed in the accommodation area 118, the annular side plate 152 can also be inserted and fixed in the accommodation groove 1182 to improve the connection strength between the protective cover 15 and the movement housing 11. For example, the annular side plate 152 is fixedly connected to the movement housing 11 through a colloid (not shown in the figure) in the accommodation groove 1182. Further, the main cover plate 151 may also be connected 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 movement housing 11. For example, the step difference between the two is approximately equal to the thickness of the main cover plate 151.

[0182] Based on the above related descriptions and in combination with Figure 32 and Figure 2, sound resistance meshes 1140 and 1170 can also be respectively provided at the outlet ends of the pressure relief hole 114 and the sound adjustment hole 117 to respectively adjust the effective areas of the outlet ends of the pressure relief hole 114 and the sound adjustment hole 117, thereby improving the acoustic performance of the earphone 100. At this time, the sound resistance meshes 1140 and 1170 can be first fixed to the top of the boss 1181 through the first annular film 1183, and then the protective cover 15 can be fixed in the accommodation area 118. Among them, the first annular film 1183 surrounds the pressure relief hole 114 and the sound adjustment hole 117 to expose the outlet ends of both. Further, the main cover plate 151 can also be fixed to the sound resistance meshes 1140 and 1170 through the second annular film 1184. Among them, the annular widths of the first annular film 1183 and the second annular film 1184 can be respectively between 0.4 mm and 0.5 mm, and the thicknesses can be respectively less than or equal to 0.1 mm. Of course, in some other embodiments, the sound resistance meshes 1140 and 1170 can also be fixed to the protective cover 15 in advance to form a structural component, and then the structural component can be fixed in the accommodation area 118. For example: the sound resistance meshes 1140 and 1170 are fixed to the same side of the main cover plate 151 through the second annular film 1184 and are surrounded by the annular side plate 152, so as to form a structural component with the protective cover 15. Among them, the sound resistance meshes 1140 and 1170 can be at least partially staggered from each other, so as to facilitate covering the outlet ends of the adjacent pressure relief hole 114 and the sound adjustment hole 117 respectively and to facilitate adapting to the interval distance between the two.

[0183] It should be noted that: in combination with Figure 2 , at the end of the sound guiding component 14 facing away from the movement housing 11, a sound resistance mesh 140 and its corresponding protective cover 15 can also be fixedly arranged in the same or similar manner as any of the above methods, so that the sound resistance mesh 140 is covered at the outlet end of the sound guiding channel 141 and is covered by the corresponding protective cover 15.

[0184] In combination with Figure 33 and Figure 2 , the coil bracket 121 can be exposed from the side of the front housing 116 in a direction perpendicular to the buckling direction of the rear housing 115 and the front housing 116. In other words, in combination with Figure 4 , for the front housing 116, at least a part of the side of its front cylindrical side plate 1162 adjacent to the sound outlet hole 113 or the sound guiding component 14 can be cut off to form an avoidance area for exposing the coil bracket 121. Further, the sound guiding component 14 can be buckled to the exposed part of the coil bracket 121 and the outside of the rear housing 115, and the sound outlet channel 141 is communicated with the sound outlet hole 113. In this way, the side of the front housing 116 adjacent to the sound guiding component 14 does not need to completely wrap the coil bracket 121, which can not only avoid local excessive thickness of the movement module 10, but also does not prevent the fixation between the sound guiding component 14 and the movement housing 11.

[0185] As an exemplary embodiment, the exposed portion of the coil support 121 and the outer side surface of the rear shell 115 can cooperate to form a boss 119. Among them, the boss 119 may include a first sub-boss portion 1191 located at the rear shell 115 and a second sub-boss portion 1192 located at the coil support 121. At this time, the sound outlet holes 113 can be entirely provided in the rear shell 115, and the outlet ends of the sound outlet holes 113 can be located at the top of the first sub-boss portion 1191. Correspondingly, a recessed area 142 may be provided on the side of the sound-conducting component 14 facing the coil support 121 and the rear shell 115. At this time, the inlet end of the sound-conducting channel 141 may be connected to the bottom of the recessed area 142. In this way, when the sound-conducting component 14 is assembled with the movement shell 11, the boss 119 may be embedded in the recessed area 142, and the sound outlet channel 141 is connected to the sound outlet hole 113. Among them, combined with Figure 2 The height of the boss 119 and the depth of the recessed area 142 can satisfy the following relationship: when the top of the boss 119 abuts against the bottom of the recessed area 142, the end surface of the sound guide component 14 is in contact with the movement housing 11, or there is a gap between the two, so as to improve the airtightness between the sound guide channel 141 and the sound outlet hole 113. Based on this, an annular seal (not shown in the figure) can also be set between the top of the boss 119 and the bottom of the recessed area 142.

[0186] Further, one of the rear housing 115 and the sound guide component 14 may be provided with a socket 1154; correspondingly, the other may be provided with a socket post 143. The socket post 143 may be inserted and fixed in the socket 1154 to improve the accuracy and reliability of the assembly of the sound guide component 14 and the movement housing 11. As an example, the socket 1154 is provided in the rear housing 115, specifically, it may be located in the first sub-boss portion 1191; the socket post 143 is provided in the sound guide component 14, specifically, it may be located in the recessed area 142.

[0187] It should be noted that: Figure 33 The sound guide component 14 and the movement housing 11 can be along Figure 33 Assemble in the direction shown by the dotted line.

[0188] In some embodiments, for example, the movement module 10 is not provided with a diaphragm 13, and the front housing 116 can press the coil support 121 on the annular support platform 1153 to improve the reliability of the assembly of the movement module 10. Specifically, the front housing 116 can press the other end of the second cylindrical support portion 1213 away from the annular main body portion 1211 on the annular support platform 1153.

[0189] In some other embodiments, for example, when the movement module 10 is provided with a diaphragm 13, the front housing 116 can press the coil holder 121 and the connected diaphragm 13 together onto the annular bearing platform 1153 to improve the assembly reliability of the movement module 10. Among them, the diaphragm 13 can be connected to the other end of the second cylindrical support portion 1213 away from the annular main body portion 1211 through its reinforcing ring 136. Specifically, the front housing 116 can press the reinforcing ring 136 onto the annular bearing platform 1153 through the second cylindrical support portion 1213.

[0190] As an example, in combination with Figure 33 and Figure 4 , the sound tuning hole 117 can be provided in the rear housing 115 in the form of a complete through hole; while the pressure relief hole 114 can be provided in the front housing 116 in the form of an incomplete notch, and a complete through hole is formed through the splicing and cooperation of the rear housing 115 and the front housing 116. In this way, it is not only convenient to reduce the interval distance between the adjacent pressure relief hole 114 and the sound tuning hole 117, but also convenient to make the actual area of the outlet end of the pressure relief hole 114 larger than the actual area of the outlet end of the sound tuning hole 117.

[0191] The above are only some embodiments of the present application, and thus do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. An earphone, characterized in that, The earphone includes an earhook assembly, a rear hook assembly and a movement module. One end of the rear hook assembly is connected to one end of the earhook assembly, and the other end of the earhook assembly away from the rear hook assembly is connected to the movement module. The movement module includes a movement housing, a transducer device and a diaphragm. The movement housing is used to contact the user's skin and form a receiving cavity. The transducer device is arranged in the receiving cavity and connected to the movement housing, so that the skin contact area of the movement housing generates bone conduction sound under the action of the transducer device. The diaphragm is connected between the transducer device and the movement housing to divide 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 housing is provided with a sound outlet hole communicating with the rear cavity. The diaphragm generates air conduction sound transmitted to the human ear through the sound outlet hole during the relative movement between the transducer device and the movement housing. The movement module further includes a Helmholtz resonance cavity communicating with the front cavity and / or the rear cavity.

2. The earphone according to claim 1, wherein The Helmholtz resonance cavity is arranged on the movement housing.

3. The earphone according to claim 1, wherein The transducer device includes a magnetic circuit system and a coil assembly. The magnetic circuit system forms a magnetic gap. The coil assembly is arranged in the front cavity and extends into the magnetic gap. The Helmholtz resonance cavity is arranged on the magnetic circuit system.

4. The earphone according to claim 1, wherein The frequency response curve of the air conduction sound output to the outside of the earphone through the sound outlet hole has a first resonance peak. The Helmholtz resonance cavity is arranged to communicate with the rear cavity and is arranged to weaken the peak resonance intensity of the first resonance peak.

5. The earphone according to claim 4, characterized in that, The difference between the peak resonance intensity of the first resonance peak when the opening of the Helmholtz resonance cavity communicating with the rear cavity is in the open state and the peak resonance intensity of the first resonance peak when the opening of the Helmholtz resonance cavity communicating with the rear cavity is in the closed state is greater than or equal to 3 dB.

6. The earphone according to claim 4, characterized in that, The movement housing is further provided with at least one sound tuning hole communicating with the rear cavity. The peak resonance frequency of the first resonance peak when the at least one sound tuning hole is in the open state is shifted to a higher frequency compared with the peak resonance frequency of the first resonance peak when the at least one sound tuning hole is in the closed state, and the shift amount is greater than or equal to 500 Hz.

7. The earphone according to claim 1, wherein The movement housing is further provided with a pressure relief hole communicating with the front cavity. The frequency response curve of the air conduction sound output to the outside of the earphone through the pressure relief hole has a second resonance peak. The Helmholtz resonance cavity is arranged to communicate with the front cavity and is arranged to weaken the peak resonance intensity of the second resonance peak.

8. The earphone according to claim 7, characterized in that, The difference between the peak resonance intensity of the second resonance peak when the opening of the Helmholtz resonance cavity communicating with the front cavity is in the open state and the peak resonance intensity of the second resonance peak when the opening of the Helmholtz resonance cavity communicating with the front cavity is in the closed state is greater than or equal to 3 dB.

9. The earphone according to claim 1, wherein The Helmholtz resonance cavity communicates with both the front cavity and the rear cavity at the same time, and the area of the opening communicating with the front cavity is greater than or equal to the area of the opening communicating with the rear cavity.

10. The earphone according to claim 1, wherein The opening of the Helmholtz resonance cavity is covered with a sound resistance net, and the porosity of the sound resistance net is greater than or equal to 3%.

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