Earphone and rear-hanging assembly thereof

Abstract

This application primarily relates to headphones and their rear-hook assembly. The rear-hook assembly includes an elastic metal wire and metal connectors. The metal connectors are respectively sleeved and fixed to both ends of the elastic metal wire. The deformation of the first part of the elastic metal wire located inside the metal connector is less than or equal to 10% compared to the deformation of the second part of the elastic metal wire located outside the metal connector. The rear-hook assembly provided by this application replaces the plastic connectors fixed to both ends of the elastic metal wire in related technologies with metal connectors. This can reduce or even eliminate the need for pre-treatment such as flattening the ends of the elastic metal wire, thereby preventing the elastic metal wire from becoming brittle due to deformation, increasing the reliability of the rear-hook assembly. Moreover, the metal connectors themselves have superior structural strength compared to the plastic connectors.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, specifically to headphones and their rear-mounted components. Background Technology

[0002] With the increasing popularity of electronic devices, they have become indispensable social and entertainment tools in people's daily lives, and people's demands for electronic devices are also getting higher and higher. Taking electronic devices such as headphones as an example, they not only need excellent wearing comfort, but also sound quality with deep bass, penetrating treble, and good battery life. Summary of the Invention

[0003] This application provides a rear-hook assembly for headphones. The rear-hook assembly includes an elastic metal wire and metal connectors. The metal connectors are respectively sleeved and fixed to both ends of the elastic metal wire. The deformation of the first part of the elastic metal wire inside the metal connector is less than or equal to 10% compared to the deformation of the second part of the elastic metal wire outside the metal connector.

[0004] This application embodiment also provides an earphone, which includes a mechanism module, an ear hook assembly, and a back hook assembly as described in the above embodiment. The two ends of the back hook assembly are respectively connected to one end of the ear hook assembly through their respective metal connectors, and the other end of the ear hook assembly, which is away from the back hook assembly, is connected to the mechanism module.

[0005] The beneficial effects of this application are: the rear-mounted assembly provided by this application replaces the plastic connectors fixed to both ends of the elastic metal wire in the related technology with metal connectors, which can reduce or even avoid the pre-treatment of the ends of the elastic metal wire such as flattening, thereby avoiding the elastic metal wire from becoming brittle due to deformation, increasing the reliability of the rear-mounted assembly, and the metal connector itself has better structural strength than the plastic connector. Attached Figure Description

[0006] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0007] Figure 1 This is a schematic diagram of the structure of an embodiment of the headphones provided in this application;

[0008] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the movement module provided in this application;

[0009] Figure 3 This is a schematic diagram comparing the frequency response curves of the headphones before and after the diaphragm is installed, as provided in this application.

[0010] Figure 4 This is a cross-sectional structural schematic diagram of an embodiment of the movement housing provided in this application;

[0011] Figure 5 This is a cross-sectional structural schematic diagram of an embodiment of the transducer provided in this application;

[0012] Figure 6 These are schematic diagrams of partial cross-sectional structures of various embodiments of the diaphragm provided in this application;

[0013] Figure 7 This is a schematic diagram of a partial cross-sectional structure of the diaphragm provided in this application;

[0014] Figure 8 These are schematic diagrams illustrating the principle structure of various embodiments of the sound guiding component provided in this application;

[0015] Figure 9 This is a top view of an embodiment of the acoustic barrier provided in this application.

[0016] Figure 10 This is a schematic diagram of the frequency response curve of the air-conducting sound component in an embodiment of the earphone provided in this application;

[0017] Figure 11 This is a schematic diagram of the frequency response curve of the air-conducting sound component in an embodiment of the earphone provided in this application;

[0018] Figure 12 This is a schematic diagram of the frequency response curve of air conduction sound at the pressure relief hole of an embodiment of the headphones provided in this application;

[0019] Figure 13 This is a schematic diagram showing the sound pressure distribution of the front and rear cavities of the mechanism module with the sound adjustment hole provided in this application;

[0020] Figure 14 This is a schematic diagram of the frequency response curve of the air-conducting sound component in an embodiment of the earphone provided in this application;

[0021] Figure 15 This is a schematic diagram of the frequency response curve of the air-conducting sound component in an embodiment of the earphone provided in this application;

[0022] Figure 16 This is a schematic diagram of the frequency response curve of the sound leakage of the movement module provided in this application;

[0023] Figure 17 This is a schematic diagram of the principle structure of an embodiment of the movement module provided in this application;

[0024] Figure 18 This is an exploded structural diagram of an embodiment of the movement module provided in this application;

[0025] Figure 19 This is an exploded structural diagram of an embodiment of the movement module provided in this application;

[0026] Figure 20 This is a cross-sectional structural schematic diagram of an embodiment of the movement module provided in this application;

[0027] Figure 21 This is a cross-sectional structural schematic diagram of an embodiment of the movement module provided in this application;

[0028] Figure 22 This is an exploded structural diagram of an embodiment of the ear hook assembly provided in this application;

[0029] Figure 23 yes Figure 22 A partial cross-sectional schematic diagram of the middle ear hook assembly;

[0030] Figure 24 yes Figure 23 A magnified schematic diagram of a portion of region A in the middle;

[0031] Figure 25 This is an exploded structural diagram of an embodiment of the rear-mounted component provided in this application;

[0032] Figure 26 yes Figure 25 A magnified schematic diagram of a portion of region B in the middle;

[0033] Figure 27 yes Figure 25 A schematic diagram of the structure of the metal connector in contact with the wire;

[0034] Figure 28 yes Figure 25 A partial cross-sectional schematic diagram of the mid-rear suspension assembly;

[0035] Figure 29 This is a schematic diagram of the structure of an embodiment of the coil support provided in this application. Detailed Implementation

[0036] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0037] The reference to "embodiment" in this application means that specific features, structures, or characteristics described in connection with the embodiments may be included in the embodiments of this application. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0038] Combination Figure 1 The earphone 100 may include two mechanism modules 10, two ear hook assemblies 20, and a back hook assembly 30. Each end of the back hook assembly 30 is connected to one end of a corresponding ear hook assembly 20, and the other end of each ear hook assembly 20, facing away from the back hook assembly 30, is connected to a corresponding mechanism module 10. Furthermore, the back hook assembly 30 may be curved to wrap around the back of the user's head, and the ear hook assemblies 20 may also be curved to hang between the user's ears and head, thus facilitating the wearing of the earphone 100. The mechanism modules 10 convert electrical signals into mechanical vibrations so that the user can hear sound through the earphone 100. Thus, when the earphone 100 is worn, the two mechanism modules 10 are located on the left and right sides of the user's head, respectively, and the two mechanism modules 10, in conjunction with the ear hook assemblies 20 and the back hook assembly 30, hold the user's head, allowing the user to hear the sound output from the earphone 100.

[0039] It should be noted that the headphones 100 can also be worn in other ways, such as the ear hook component 20 covering or wrapping around the user's ears, and the back hook component 30 crossing over the user's head, which will not be listed here.

[0040] Combination Figure 1 The earphone 100 may also include a main control circuit board 40 and a battery 50. The main control circuit board 40 and the battery 50 can be housed within the same ear hook assembly 20's receiving compartment, or they can be housed separately within the receiving compartments of two different ear hook assemblies 20. Furthermore, both the main control circuit board 40 and the battery 50 can be electrically connected to two mechanism modules 10 via corresponding wires. The former can be used to control the mechanism module 10 to convert electrical signals into mechanical vibrations, while the latter can be used to provide power to the earphone 100. Of course, the earphone 100 described in this application may also include microphones, pickups, and other transducers, as well as communication components such as Bluetooth and NFC. These components can also be connected to the main control circuit board 40 and the battery 50 via corresponding wires to achieve their respective functions.

[0041] It should be noted that there are two mechanism modules 10 described in this application. Both mechanism modules 10 can convert electrical signals into mechanism vibrations, mainly to facilitate the stereo sound effect of the earphone 100. Therefore, in some other application scenarios where the stereo requirements are not particularly high, such as hearing aids for hearing-impaired patients and prompting for live broadcasts, the earphone 100 may only have one mechanism module 10.

[0042] Based on the above description, the mechanism module 10 is used to convert electrical signals into mechanical vibrations when powered on, so that the user can hear sound through the headphones 100. Generally, the aforementioned mechanical vibrations can act directly on the user's auditory nerve based on the principle of bone conduction, mainly through the user's bones and tissues as a medium, or they can act on the user's eardrum based on the principle of air conduction, mainly through air as a medium, and thus act on the auditory nerve. For the sound heard by the user, the former can be simply referred to as "bone conduction sound," and the latter can be simply referred to as "air conduction sound." Based on this, the mechanism module 10 can generate both bone conduction sound and air conduction sound, or it can generate both simultaneously.

[0043] Combination Figure 2 and Figure 1 The mechanism module 10 may include a mechanism housing 11 and a transducer 12. The mechanism housing 11 is connected to one end of the ear hook assembly 20 and is used for contact with the user's skin. Further, the mechanism housing 11 also forms a receiving cavity (not shown in the figure), and the transducer 12 is disposed within the aforementioned receiving cavity and connected to the mechanism housing 11. The transducer 12 is used to convert electrical signals into mechanical vibrations when energized, so that the skin contact area of ​​the mechanism housing 11 (e.g., ...) Figure 4 The front base plate 1161 shown can generate bone conduction sound under the action of the transducer 12. Thus, when the user wears the headphones 100, the transducer 12 converts electrical signals into core vibrations, causing the aforementioned skin contact area to generate mechanical vibrations. These mechanical vibrations then act directly on the user's auditory nerve through the user's bones and tissues, thereby enabling the user to hear bone conduction sound through the core module 10.

[0044] Furthermore, the mechanism module 10 may also include a diaphragm 13 connected between the transducer 12 and the mechanism housing 11. The diaphragm 13 is used to divide the internal space of the mechanism housing 11 (i.e., the aforementioned accommodating cavity) into a front cavity 111 closer to the skin contact area and a rear cavity 112 farther away from the 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. The mechanism housing 11 is provided with a sound outlet 113 communicating with the rear cavity 112. During the relative movement between the transducer 12 and the mechanism housing 11, the diaphragm 13 can generate air-conducted sound that is transmitted to the ear through the sound outlet 113. Thus, the sound generated in the rear cavity 112 can be transmitted through the sound outlet 113 and then act on the user's eardrum through the air, allowing the user to hear the air-conducted sound through the mechanism module 10.

[0045] It should be noted that: combination Figure 2When the transducer 12 moves the skin contact area toward the user's face, it can be simply considered as bone conduction sound enhancement. Simultaneously, the portion of the mechanism housing 11 opposite the skin contact area moves toward the user's face, while the transducer 12 and its connected diaphragm 13 move away from the user's face due to the action and reaction forces. This compresses the air in the rear cavity 112, resulting in increased air pressure. Consequently, the sound transmitted through the sound outlet 113 is enhanced, which can be simply considered as air conduction sound enhancement. Correspondingly, when bone conduction sound weakens, air conduction sound also weakens. Therefore, the bone conduction sound and air conduction sound generated by the mechanism module 10 in this application have the characteristic of being in phase. Furthermore, since the front cavity 111 and rear cavity 112 are largely separated by structural components such as the diaphragm 13 and the transducer 12, the change pattern of air pressure in the front cavity 111 is exactly opposite to the change pattern of air pressure in the rear cavity 112. Based on this, the movement housing 11 can also be provided with a pressure relief hole 114 communicating with the front cavity 111. The pressure relief hole 114 allows 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 in air pressure in the rear cavity 112 can be minimized by the front cavity 111, which can effectively improve the acoustic performance of the air-conducted sound generated by the movement module 10. Among them, the pressure relief hole 114 and the sound outlet hole 113 are staggered, that is, they are not adjacent to each other, so as to avoid the silencing phenomenon caused by their opposite phase.

[0046] As an example, the actual area of ​​the outlet end of the sound outlet 113 can be greater than or equal to 8 mm². 2 This allows users to hear more air-conducted sound. The actual area of ​​the inlet end of the sound outlet 113 can also be greater than or equal to the actual area of ​​its outlet end.

[0047] It should be noted that: due to the thickness of structural components such as the movement housing 11, the through holes such as the sound outlet 113 and pressure relief hole 114 opened on the movement housing 11 have a certain depth. Therefore, relative to the aforementioned accommodating cavity, the aforementioned through holes have an inlet end close to the aforementioned accommodating cavity and an outlet end far from the aforementioned accommodating cavity. Furthermore, the actual area of ​​the outlet end described in this application can be defined as the area of ​​the end face where the outlet end is located.

[0048] Through the above methods, since the air-conducted sound and bone-conducted sound generated by the mechanism module 10 originate from the same vibration source (i.e., the transducer 12) and are in phase, the sound heard by the user through the headphones 100 is stronger, and the headphones 100 is more energy-efficient, thereby extending the battery life of the headphones 100. Furthermore, by rationally designing the structure of the mechanism module 10, the air-conducted sound and bone-conducted sound can also cooperate in the frequency bands of the frequency response curve, enabling the headphones 100 to have excellent acoustic performance in specific frequency bands. For example, air-conducted sound can compensate for the low-frequency range of bone-conducted sound, and air-conducted sound can enhance the mid-frequency and mid-high-frequency ranges of bone-conducted sound.

[0049] It should be noted that in this application, the low-frequency band corresponds to a frequency range of 20-150Hz, the mid-frequency band corresponds to a frequency range of 150-5kHz, and the high-frequency band corresponds to a frequency range of 5kHz-20kHz. Specifically, the mid-low frequency band corresponds to a frequency range of 150-500Hz, and the mid-high frequency band corresponds to a frequency range of 500-5kHz.

[0050] Based on the above detailed description, and in conjunction with Figure 3 The aforementioned skin contact area can generate bone conduction sound under the action of the transducer 12, and the aforementioned bone conduction sound correspondingly has a frequency response curve. The aforementioned frequency response curve may have at least one resonant peak. Further, the peak resonant frequency of the aforementioned resonant peak can satisfy the relationship: |f1-f2| / f1≤50%. Additionally, the difference between the peak resonant intensity corresponding to f1 and the peak resonant intensity corresponding to f2 can be less than or equal to 5dB. Here, f1 is the peak resonant frequency of the aforementioned resonant peak when the diaphragm 13 is connected to the transducer 12 and the core housing 11, and f2 is the peak resonant frequency of the aforementioned resonant peak when the diaphragm 13 is disconnected from either the transducer 12 or the core housing 11. In other words, |f1-f2| / f1 can be used to measure the magnitude of the influence of the diaphragm 13 on the transducer 12 driving the aforementioned skin contact area; the smaller this ratio, the smaller the influence. Thus, without affecting the original resonant system of the mechanism module 10 as much as possible, the introduction of the diaphragm 13 enables the mechanism module 10 to synchronously output bone conduction sound and air conduction sound with the same phase, thereby improving the acoustic performance of the mechanism module 10 and making it more energy-efficient.

[0051] As an example, combined Figure 3In this embodiment, the primary focus can be on the offset in the low-frequency or mid-low-frequency range of the frequency response curve, i.e., f1 ≤ 500Hz, to minimize the impact on the low-frequency and mid-low-frequency ranges of bone conduction sound. Specifically, the offset can be less than or equal to 50Hz, i.e., |f1-f2| ≤ 50Hz, to ensure that the diaphragm 13 does not significantly affect the transducer 12's operation of the skin contact area. Furthermore, the offset can be greater than or equal to 5Hz, i.e., |f1-f2| ≥ 5Hz, to ensure that the diaphragm 13 possesses sufficient structural strength and elasticity, reducing fatigue deformation during use and thus extending the service life of the diaphragm 13.

[0052] It should be noted that: combination Figure 3 In this embodiment, the skin contact area can be defined to have a first frequency response curve (e.g., when the diaphragm 13 is connected to the transducer 12 and the core housing 11). Figure 3 As shown in k1+k2), the aforementioned skin contact area has a second frequency response curve (e.g., when the diaphragm 13 is disconnected from any one of the transducer 12 and the core housing 11). Figure 3 (As shown in k1). Furthermore, for the frequency response curve described in this application, the horizontal axis can represent frequency, with the unit being Hz; the vertical axis can represent intensity, with the unit being dB.

[0053] Combination Figure 4 and Figure 2 The mechanism housing 11 may include a rear housing 115 and a front housing 116 connected to the rear housing 115. The rear housing 115 and the front housing 116 are interlocked to form a cavity for accommodating structural components such as the transducer 12 and the diaphragm 13. Furthermore, the front housing 116 is for contact with the user's skin, forming a skin contact area of ​​the mechanism housing 11; that is, when the mechanism housing 11 is in contact with the user's skin, the front housing 116 is closer to the user than the rear housing 115. Based on this, the transducer 12 can be connected to the front housing 116 so that the transducer 12 can drive the skin contact area of ​​the mechanism housing 11 to generate mechanical vibration. Furthermore, the sound outlet 113 can be located in the rear housing 115, and the pressure relief hole 114 can be located in the front housing 116. The diaphragm 13 can be connected to the rear housing 115, the front housing 116, or at the joint between the rear housing 115 and the front housing 116.

[0054] As an example, the rear housing 115 may include an integrally connected rear bottom plate 1151 and a rear cylindrical side plate 1152, with one end of the rear cylindrical side plate 1152 facing away from the rear bottom plate 1151 connected to the front housing 116. A sound outlet 113 may be provided on the rear cylindrical side plate 1152.

[0055] Furthermore, the inner side of the movement housing 11 may also be provided with an annular support 1153, for example, the annular support 1153 is located at one end of the rear cylindrical side plate 1152 away from the rear bottom plate 1151. Wherein, combined with Figure 4 Using the base plate 1151 as a reference, the annular bearing platform 1153 can be slightly lower than the end face of the rear cylindrical side plate 1152 that faces away from the rear base plate 1151. Figure 2 In the vibration direction of the transducer 12, the sound outlet 113 can be located between the annular base 1153 and the rear base plate 1151. Based on this, the cross-sectional area of ​​the sound outlet 113 can gradually decrease from its inlet end to its outlet end (i.e., the direction from the sound outlet 113 toward the sound outlet channel 141 mentioned later), so that the annular base 1153 has sufficient thickness in the vibration direction of the transducer 12, thereby increasing the structural strength of the annular base 1153. Thus, when the rear housing 115 and the front housing 116 are fastened together, the front housing 116 can press and fix the coil support 121 mentioned later onto the annular base 1153. Furthermore, the diaphragm 13 can be fixed onto the annular base 1153, or pressed onto the annular base 1153 by the coil support 121, and thus connected to the mechanism housing 11.

[0056] As an example, the front housing 116 may include an integrally connected front bottom plate 1161 and a front cylindrical side plate 1162, with one end of the front cylindrical side plate 1162 facing away from the front bottom plate 1161 connected to the rear housing 115. The area where the front bottom plate 1161 is located can be simply considered as the skin contact area described in this application. Accordingly, a pressure relief hole 114 may be provided on the front cylindrical side plate 1162.

[0057] Combination Figure 5 and Figure 2 The transducer 12 may include a coil support 121, a magnetic circuit system 122, a coil 123, and a spring plate 124. The coil support 121 and the spring plate 124 are disposed within the front cavity 111. The central region of the spring plate 124 can be connected to the magnetic circuit system 122, and the peripheral region of the spring plate 124 can be connected to the movement housing 11 via the coil support 121 to suspend the magnetic circuit system 122 within the movement housing 11. Furthermore, the coil 123 can be connected to the coil support 121 and extend into the magnetic gap of the magnetic circuit system 122.

[0058] As an example, the coil support 121 may include an annular main body portion 1211 and a first cylindrical support portion 1212, one end of the first cylindrical support portion 1212 being connected to the annular main body portion 1211. The annular main body portion 1211 may be connected to the peripheral area of ​​the spring sheet 124, and the two may be formed as an integral structural component using a metal insert injection molding process. In this case, the annular main body portion 1211 may be connected to the front base plate 1161 by one or a combination of methods such as adhesive bonding or snap-fit. Further, the coil 123 is connected to the other end of the first cylindrical support portion 122 away from the annular main body portion 1211, so that the coil can extend into the magnetic circuit system 122. In this case, a portion of the diaphragm 13 may be connected to the magnetic circuit system 122, and another portion may be connected to at least one of the rear housing 115 and the front housing 116.

[0059] Furthermore, the coil support 121 may also include a second cylindrical support portion 1213 connected to the annular main body portion 1211. The second cylindrical support portion 1213 surrounds the first cylindrical support portion 1212 and extends laterally toward the annular main body portion 1211 in the same direction as the first cylindrical support portion 1212. The second cylindrical support portion 1213 and the annular main body portion 1211 can be connected together to the front housing 116 to increase the connection strength between the coil support 121 and the movement housing 11. For example, the annular main body portion 1211 is connected to the front base plate 1161, while the second cylindrical support portion 1213 is connected to the second annular side plate 1152. Accordingly, the second cylindrical support portion 1213 may be provided with a clearance hole 1214 communicating with the pressure relief hole 114 to prevent the second cylindrical support portion 1213 from blocking the communication between the pressure relief hole 114 and the front cavity 111. At this time, a portion of the diaphragm 13 can be connected to the magnetic circuit system 122, and another portion can be connected to the other end of the second cylindrical support portion 1213 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 support portion 1213 away from the annular main body portion 1211 can press the other portion of the diaphragm 13 onto the annular support 1153.

[0060] It should be noted that the first cylindrical support portion 1212 and / or the second cylindrical support portion 1213 can be a continuous and complete structure in the circumferential direction of the coil support 121 to increase the structural strength of the coil support 121, or they can be a partially discontinuous structure to avoid other structural components.

[0061] As an example, the magnetic circuit system 122 may include a magnetic shield 1221 and a magnet 1222, which cooperate to form a magnetic field. The magnetic shield 1221 may include an integrally connected base plate 1223 and a cylindrical side plate 1224. Further, the magnet 1222 is disposed within the cylindrical side plate 1224 and fixed to the base plate 1223. The side of the magnet 1222 facing away from the base plate 1223 can be connected to the middle region of the spring sheet 124 via a connector 1225, allowing the coil 123 to extend into the magnetic gap between the magnet 1222 and the magnetic shield 1221. At this time, a portion of the diaphragm 13 can be connected to the magnetic shield 1221.

[0062] It should be noted that magnet 1222 can be a magnet group formed by multiple sub-magnets. In addition, a magnetic guide plate (not shown in the figure) can also be provided on the side of magnet 1222 that is away from the base plate 1223.

[0063] Combination Figure 6 , Figure 5 and Figure 2 The diaphragm 13 may include a diaphragm body 131, which may include an integrally connected first connecting portion 132, a pleated portion 133, and a second connecting portion 134. The first connecting portion 132 surrounds 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 pleated 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.

[0064] As an example, the first connecting portion 132 can be cylindrical and connected to the magnetic shield 1221; the second connecting portion 134 can be annular and connected to the other end of the second cylindrical support portion 1213 opposite to the annular main body portion 1211, and then connected to the movement housing 11. Wherein, combined with Figure 5 The connection point between the pleated portion 133 and the first connecting portion 132 can be lower than the end face of the cylindrical side plate 1224 away from the bottom plate 1223.

[0065] Furthermore, the pleated portion 133 forms a recessed area 135 between the first connecting portion 132 and the second connecting portion 134, so that the first connecting portion 132 and the second connecting portion 134 can more easily move relative to each other in the vibration direction of the transducer 12, thereby reducing the influence of the diaphragm 13 on the transducer 12. Wherein, combined with Figure 2 The recessed area 135 can be recessed towards the rear cavity 112. Of course, the recessed area 135 can also be recessed towards the front cavity 111, that is, towards... Figure 2 The depressions in the recessed area 135 shown are in opposite directions.

[0066] It should be noted that the number of recessed areas 135 can be multiple, such as two or three, and they are distributed at intervals in the direction perpendicular to the vibration direction of the transducer 12; the depth of each recessed area 135 in the vibration direction of the transducer 12 can also be different. In this embodiment, one recessed area 135 is used as an example for illustrative purposes.

[0067] As an example, the diaphragm body 131 can be made of polycarbonate (PC), polyamides (PA), acrylonitrile butadiene styrene copolymer (ABS), polystyrene (PS), high impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyurethanes (PU), polyethylene (PE), or phenolic resin. Formaldehyde (PF), urea-formaldehyde (UF), melamine-formaldehyde (MF), polyarylate (PAR), polyetherimide (PEI), polyimide (PI), polyethylene naphthalate dicarboxylate (PEN), polyetheretherketone (PEEK), silicone, or any combination thereof. Among them, PET is a thermoplastic polyester with good molding properties, and diaphragms made from it are often called Mylar films; PC has strong impact resistance and dimensional stability 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 resistant to high temperatures, has a higher molding temperature, and a longer processing time; PEN has high strength and is relatively hard, and its characteristics include the ability to be painted, dyed, and plated; PU is often used as a damping layer or folding ring in composite materials, with high elasticity and high internal damping; PEEK is a newer material that is resistant to friction and fatigue. It is worth noting that composite materials can generally combine the characteristics of multiple materials. Common examples include double-layer structures (generally hot-pressed PU to increase internal resistance), three-layer structures (sandwich structure with a damping layer of PU, acrylic adhesive, UV adhesive, or pressure-sensitive adhesive in the middle), and five-layer structures (two thin films are bonded together with double-sided adhesive, which has a base layer, usually PET).

[0068] Furthermore, the diaphragm 13 may also include a reinforcing ring 136, the stiffness of which may be greater than that of the diaphragm body 131. The reinforcing ring 136 may be annular, with a width greater than or equal to 0.4 mm and a thickness less than or equal to 0.4 mm. Furthermore, the reinforcing ring 136 is connected to the second connecting portion 134, so that the second connecting portion 134 is connected to the mechanism housing 11 via the reinforcing ring 136. This increases the structural strength of the edge of the diaphragm 13, thereby increasing the connection strength between the diaphragm 13 and the mechanism housing 11.

[0069] It should be noted that the reinforcing ring 136 is ring-shaped, mainly to facilitate adaptation to the annular structure of the second connecting part 134; however, the reinforcing ring 136 can be either a continuous complete ring or a discontinuous segmented ring. Furthermore, after the movement module 10 is assembled, the other end of the second cylindrical support part 1213 away from the annular main body part 1211 can press the reinforcing ring 136 onto the annular support 1153.

[0070] As an example, the first connecting portion 132 can be injection molded onto the outer peripheral surface of the magnetic shield 1221, and the reinforcing ring 136 can also be injection molded onto the second connecting portion 134 to simplify the connection method between the two and increase the connection strength between them. The first connecting portion 132 can cover the cylindrical side plate 1224, and may further cover the bottom plate 1223, to increase the contact area between the first connecting portion 132 and the magnetic circuit system 122, thereby increasing the bonding strength between them. Similarly, the second connecting portion 134 can be connected to the inner ring surface and one end face of the reinforcing ring 136 to increase the contact area between the second connecting portion 134 and the reinforcing ring 136, thereby increasing the bonding strength between them.

[0071] Combination Figure 6 , Figure 6 Images (a) to (d) primarily illustrate various structural deformations of the diaphragm body 131, with the main difference between them lying in the specific structure of the folds 133. Specifically, for... Figure 6 In (a), the pleated portion 133 can be configured with a symmetrical structure, and the connection points formed by its two ends with the first connecting portion 132 and the second connecting portion 134 can 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 pleated portion 133 can also be mostly configured as a symmetrical 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 offset from each other. Figure 6In (c), the pleated portion 133 can be configured with an asymmetrical structure, but its two ends are coplanar with the connection points formed by the first connecting portion 132 and the second connecting portion 134, respectively. Figure 6 In the case of (d), the pleated portion 133 can be configured as an asymmetrical structure, and the connection points formed by its two ends with the first connecting portion 132 and the second connecting portion 134 are not coplanar.

[0072] Based on the above description, for the diaphragm 13, while ensuring sufficient structural strength to guarantee its basic structure, fatigue resistance, and other performance, the more flexible and easily elastically deformable the diaphragm body 131 is, the smaller the impact on the transducer 12. Therefore, the thickness of the diaphragm body 131 can be less than or equal to 0.2 mm; preferably, the thickness can be less than or equal to 0.1 mm. The elastic deformation of the diaphragm body 131 can mainly occur in the folded portion 133. Therefore, the thickness of the folded portion 133 can be smaller than the thickness of other parts of the diaphragm body 131. Therefore, the thickness of the folded portion 133 can be less than or equal to 0.2 mm; preferably, the thickness can be less than or equal to 0.1 mm. This embodiment uses a diaphragm body 131 with a uniform thickness structure as an example for illustrative purposes.

[0073] Combination Figure 7 In the vibration direction of the transducer 12, the recessed area 135 may have a depth H; in the direction perpendicular to the vibration direction of the transducer 12, the recessed area 135 may have a width W1 equal to half its depth, and there may be a gap W2 between the first connecting part 132 and the second connecting part 134. Wherein, 0.2 ≤ W1 / W2 ≤ 0.6, this ensures the size of the deformable area on the pleated part 133 while avoiding structural interference between the pleated part 133 and the first connecting part 132 and / or the mechanism housing 11. Similarly, 0.2 ≤ H / W2 ≤ 1.4, this ensures the size of the deformable area on the pleated part 133, making it sufficiently flexible, while also avoiding structural interference between the pleated part 133 and the first connecting part 132 and / or the mechanism housing 11, and preventing the pleated part 133 from being too heavy to vibrate.

[0074] It should be noted that: the half-depth width W1 refers to the width of the recessed area 135 at a depth of 1 / 2H.

[0075] Furthermore, the folded portion 133 may include a first transition segment 1331, a second transition segment 1332, a third transition segment 1333, a fourth transition segment 1334, and a fifth transition segment 1335 integrally connected. One end of the first transition segment 1331 and the second transition segment 1332 may be connected to the first connecting portion 132 and the second connecting portion 134 respectively, and they extend toward each other. One end of the third transition segment 1333 and the fourth transition segment 1334 are connected to the other ends of the first transition segment 1331 and the second transition segment 1332 respectively, and both ends of the fifth transition segment 1335 are connected to the other ends of the third transition segment 1333 and the fourth transition segment 1334 respectively. In this case, the aforementioned transition segments together enclose and form a recessed area 135. In the direction from the connection point (e.g., point 7A) between the first transition section 1331 and the first connecting portion 132 to the reference position point (e.g., point 7C) of the folded portion 133 furthest from the first connecting portion 132, the angle between the tangent (e.g., dashed line TL1) of the first transition section 1331 toward the recessed area 135 and the vibration direction of the transducer 12 can gradually decrease; similarly, in the direction from the connection point (e.g., point 7B) between the second transition section 1332 and the second connecting portion 134 to the aforementioned reference position point, the angle between the tangent (e.g., dashed line TL2) of the second transition section 1332 toward the recessed area 135 and the vibration direction of the transducer 12 can gradually decrease, so that the recessed area 135 can be recessed toward the rear cavity 112. Furthermore, the angle between the tangent (e.g., dashed line TL3) of the third transition section 1333 facing the recessed region 135 and the vibration direction of the transducer 12 can remain constant or gradually increase; similarly, the angle between the tangent (e.g., dashed line TL4) of the fourth transition section 1334 facing the recessed region 135 and the vibration direction of the transducer 12 can remain constant or gradually increase. In this case, the fifth transition section 1335 can be arranged in an arc shape.

[0076] As an example, the fifth transition segment 1335 can be configured in an arc shape, and the radius of the arc can be greater than or equal to 0.2 mm. Wherein, combined with Figure 6 In (a) or (b), the angle between the tangent of the third transition segment 1333 towards the recessed region 135 and the vibration direction of the transducer 12 can be zero; similarly, the angle between the tangent of the fourth transition segment 1334 towards the recessed region 135 and the vibration direction of the transducer 12 can be zero. In this case, the radius of the arc of the fifth transition segment 1335 can be equal to half the half-depth width W1 of the recessed region 135. Of course, in conjunction with... Figure 6In (c) or (d), the angle between the tangent of the third transition section 1333 towards the recessed region 135 and the vibration direction of the transducer 12 can be zero; while the angle between the tangent of the fourth transition section 1334 towards the recessed region 135 and the vibration direction of the transducer 12 can be a constant value greater than zero. In this case, the fourth transition section 1334 can be tangent to the fifth transition section 1335.

[0077] Furthermore, the projection length of the first transition segment 1331 in the direction perpendicular to the vibration direction of the transducer 12 can be defined as W3, the projection length of the second transition segment 1332 in the aforementioned vertical direction can be defined as W4, and the projection length of the fifth transition segment 1335 in the aforementioned vertical direction can be defined as W5, where 0.4≤(W3+W4) / W5≤2.5.

[0078] As an example, the first transition segment 1331 and the second transition segment 1332 can each be configured in an arc shape. Specifically, the arc radius R1 of the first transition segment 1331 can be greater than or equal to 0.2 mm, and the arc radius R2 of the second transition segment 1332 can be greater than or equal to 0.3 mm, to avoid excessive bending in the local area of ​​the wrinkled portion 133, thereby increasing the reliability of the diaphragm 13. Of course, in other embodiments, the first transition segment 1331 may include an arc segment and a flat segment connected to each other, with the arc segment connected to the third transition segment 1333 and the flat segment connected to the first connecting portion 132; the second transition segment 1332 may also be similar to the first transition segment 1331.

[0079] Based on the above detailed description, and in conjunction with Figure 7 The thickness of the diaphragm body 131 can be 0.1 mm. Optionally, W1 ≥ 0.9 mm, and 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, and H = 0.55 mm.

[0080] Combination Figure 7 and Figure 5In the vibration direction of the transducer 12, the distance from the connection point (e.g., point 7A) between the pleated portion 133 and the first connecting 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 sheet 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. Since the magnitude of distance d2 is relatively fixed, the magnitude of distance d1 can be adjusted based on distance d2 to adjust the specific connection position between the pleated portion 133 and the first connecting portion 132. Further, the distance from the geometric center of the magnet 1222 (e.g., point G) 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. Since the magnitude of distance d3 is relatively fixed, the magnitude of distance d1 can also be adjusted based on distance d3 to adjust the specific connection position between the pleated portion 133 and the first connecting portion 132. Thus, one end of the magnetic circuit system 122 can be connected to the core housing 11 via the spring plate 124 and the coil support 121, while the other end can be connected to the core housing 11 via the diaphragm 13. In other words, the spring plate 124 and the diaphragm 13 can fix both ends of the magnetic circuit system 122 to the core housing 11 in the vibration direction of the transducer 12, thereby greatly improving the stability of the magnetic circuit system 122.

[0081] As an example, d1 ≥ d3, so that in the vibration direction of the transducer 12, combined Figure 2 The sound outlet 113 can be located at least partially between the aforementioned connection point and the aforementioned outer end face. In this way, while maximizing the stability of the magnetic circuit system 122, sufficient space can be provided for the volume of the rear cavity 112 to increase the acoustic performance of the mechanism module 10. It also provides sufficient design space for the position and size of the sound outlet 113 on the mechanism housing 11, so as to flexibly set the sound outlet 113.

[0082] Based on the above descriptions, and in conjunction with Figure 5 Using the side of the base plate 1223 facing away from the cylindrical side plate 1224 as a reference, distance d1 can also be considered as the distance between the second connecting part 134 and the base plate 1223, distance d2 can also be considered as the distance between the spring sheet 124 and the base plate 1223, and distance d3 can also be considered as the distance between the geometric center of the magnet 1222 and the base plate 1223. In one specific embodiment, d1 can optionally be 2.85mm, d2 can be 4.63mm, and d3 can be 1.78mm.

[0083] Furthermore, the distance between the projections of the connection point (e.g., point 7A) between the first connecting part 132 and the pleated part 133, and the connection point (e.g., point 7B) between the second connecting part 134 and the pleated part 133, onto the vibration direction of the transducer 12 can be defined as d4, where 0 ≤ d4 / W2 ≤ 1.8. At this time, the specific position of the connection between the pleated part 133 and the first connecting part 132 can also be adjusted. In conjunction with... Figure 6 In (a) or (c), the connection point between the first connecting part 132 and the pleated part 133, and the connection point between the second connecting part 134 and the pleated part 133, can respectively coincide in the projection of their respective points on the vibration direction of the transducer 12, that is, d4 = 0. Of course, combined with Figure 6 In (b) or (d), the connection point between the first connecting part 132 and the pleated part 133 (e.g., point 7A) and the connection point between the second connecting part 134 and the pleated part 133 (e.g., point 7B) can be offset from each other in the vibration direction of the transducer 12, that is, d4 > 0.

[0084] Combination Figure 8 and Figure 2 The mechanism module 10 may further include a sound-guiding component 14 connected to the mechanism housing 11. The sound-guiding component 14 has a sound-guiding channel 141 that communicates with the sound outlet 113 and guides the air-guided sound towards the ear. In other words, the sound-guiding component 14 can change the propagation path / direction of the air-guided sound, thereby altering its directivity; and can shorten the distance between the sound outlet 113 and the ear, thereby increasing the intensity of the air-guided sound. Furthermore, the sound-guiding component 14 can also allow the air-guided sound to be further away from the actual output position of the earphone 100 from the rear surface of the mechanism housing 11 opposite to its skin contact area (e.g., the area where the rear bottom plate 1151 is located), thus mitigating the potential sound leakage at the rear bottom plate 1151 that could cause phase cancellation on the sound at the sound outlet 113. This allows the user to hear the air-guided sound better when wearing the earphone 100.

[0085] Generally, to ensure sound quality, the frequency response curve should be relatively flat over a wide frequency range, meaning the resonant peak should be located at a higher frequency as much as possible. Specifically, the frequency response curve of the air-conducted sound output through the sound outlet 113 to the outside of the earphone 100 has a resonant peak, the peak resonant frequency of which can be greater than or equal to 1kHz; preferably, the peak resonant frequency can be greater than or equal to 2kHz, giving the earphone 100 better voice output performance; more preferably, the peak resonant frequency can be greater than or equal to 3.5kHz, giving the earphone 100 better music output performance; the peak resonant frequency can further be greater than or equal to 4.5kHz.

[0086] Based on the above description, the sound guide channel 141 is connected to the rear cavity 112 through the sound outlet 113, forming a typical Helmholtz resonant cavity structure. Specifically, based on the Helmholtz resonant cavity model, its resonant frequency f satisfies the following relationship with the volume V of the rear cavity 112, the cross-sectional area S of the sound guide channel 141, its equivalent radius R, and its length L: f∝[S / (VL+1.7VR)] 1 / 2 Obviously, with a fixed volume of the rear cavity 112, increasing the cross-sectional area of ​​the sound-conducting channel 141 and / or decreasing the length of the sound-conducting channel 141 are both beneficial to increasing the resonant frequency, thereby allowing the aforementioned air-conducted sound to move as high a frequency as possible.

[0087] As an example, 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. In the vibration direction of the transducer 12, the distance between the outlet end of the sound guiding channel 141 and the rear end face of the mechanism housing 11 away from the skin contact area can be greater than or equal to 3 mm, thereby avoiding the cancellation of the air-guided sound at the outlet end of the sound guiding channel 141 by the sound leakage generated at the rear end face of the mechanism housing 11.

[0088] As an example, the cross-sectional area of ​​the sound guide 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 Furthermore, combining Figure 2 The cross-sectional area of ​​the sound-guiding channel 141 can gradually increase along the transmission direction of the air-guided sound (i.e., in the direction away from the sound outlet 113), so that the sound-guiding channel 141 can be configured in a trumpet shape; and can extend towards the front housing 116 to facilitate the guidance of the air-guided sound. The cross-sectional area of ​​the inlet end of the sound-guiding channel 141 can be greater than or equal to 10 mm². 2 Alternatively, the cross-sectional area of ​​the outlet end of the sound guide channel 141 can be greater than or equal to 15 mm². 2 .

[0089] As an example, 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. The volume of the rear cavity 112 can be less than or equal to 400 mm². 3 Preferably, the volume of the rear cavity 112 can be between 200 mm. 3 Up to 400mm 3 between.

[0090] In one specific embodiment, the sound guiding channel 141 can be configured in a horn shape. The length of the sound guiding channel 141 can be 2.5 mm, and the cross-sectional areas of its inlet and outlet ends can each be 15 mm². 2 25.3mm 2 Furthermore, the volume of the rear cavity 112 can be 350 mm². 3 .

[0091] Combination Figure 8 , Figure 8 Images (a) to (e) primarily illustrate various structural variations of the sound-guiding component 14, with the main difference lying in the specific structure of the sound-guiding channel 141. Specifically, for... Figure 8 In terms of (a) to (c), the sound guide channel 141 can be simply regarded as a bent arrangement; while for Figure 8 In sections (d) to (e), the sound-conducting channel 141 can be simply considered as a straight-through configuration. Clearly, the aforementioned air-conducting sound will differ to some extent depending on the structural differences of the sound-conducting channel 141, specifically:

[0092] for Figure 8 In (a), the sound output direction of the sound guide channel 141 is directed toward the user's face, and the distance from the outlet end of the sound guide channel 141 to the rear end face can be increased, thereby optimizing the directivity and intensity of the air-guided sound.

[0093] for Figure 8 In (b), the sound output direction of the sound channel 141 is directed toward the user's auricle, making it easier for the aforementioned air-conducted sound to be collected by the auricle and enter the ear canal, thereby optimizing the intensity of the aforementioned air-conducted sound.

[0094] for Figure 8 In the case of (c), the sound output direction of the sound guide channel 141 also points towards the user's ear canal, which can also optimize the intensity of the aforementioned air-conducted sound. At the same time, the outlet end of the sound guide channel 141 adopts an oblique outlet method. The oblique outlet means that the actual area of ​​the outlet end of the sound guide channel 141 is not limited by the cross-sectional area of ​​the sound guide channel 141, which is equivalent to increasing the cross-sectional area of ​​the sound guide channel 141, thereby facilitating the output of the aforementioned air-conducted sound.

[0095] for Figure 8 In the case of (d), the wall of the sound guide channel 141 is flat, which facilitates demolding during the manufacturing process.

[0096] for Figure 8 In the case of (e), the wall of the sound-conducting channel 141 is curved, which is conducive to achieving acoustic impedance matching between the sound-conducting channel 141 and the atmosphere, and thus facilitates the output of the aforementioned air-conducted sound.

[0097] It should be noted that the cross-sectional area of ​​a point in the sound guide channel 141 refers to the minimum area that can be captured when the sound guide channel 141 is cut off at that point. Furthermore, a straight-through sound guide channel means that the entirety of the other can be observed from either the inlet or outlet end of the sound guide channel 141. In this case, for example... Figure 8 For the straight-through sound guide channel shown in (d) to (e), the length of the sound guide channel 141 can be calculated as follows: First, determine the geometric center of the entrance end of the sound guide channel 141 (e.g., point 8A) and the geometric center of its exit end (e.g., point 8B); then connect the aforementioned geometric centers to form line segment 8A-8B, and the length of this line segment can be simply regarded as the length of the sound guide channel 141. Correspondingly, a bent sound guide channel refers to a sound guide channel 141 where the other is not observable from either the entrance end or the exit end, or only a portion of the other can be observed. In this case, for example... Figure 8 For the bent sound guide channel shown in (a) to (c), the bent sound guide channel can be divided into two or more straight sub-guide channels, and the sum of the lengths of the straight sub-guide channels is taken as the length of the bent sound guide channel. For example: in Figure 8 In (a) to (c), the geometric center of the surface where the intermediate bend is located (e.g., points 8C1 and 8C2) is further determined, and the aforementioned geometric centers are then connected to form a line segment 8A-8C1-8B (or 8A-8C1-8C2-8B). The length of this line segment can be simply regarded as the length of the sound guide channel 141.

[0098] Combination Figure 2 The outlet end of the sound guide channel 141 is generally covered with an acoustic barrier mesh 140. This mesh serves two purposes: firstly, it adjusts the acoustic resistance of the air-conducted sound output through the sound outlet 113 to the outside of the earphone 100, thereby reducing the peak resonant frequency of the aforementioned air-conducted sound in the mid-to-high frequency or high frequency ranges, resulting in a smoother frequency response curve and better sound quality; secondly, it also isolates the rear cavity 112 from the outside to a certain extent, thereby increasing the waterproof and dustproof performance of the mechanism module 10. The acoustic resistance of the acoustic barrier mesh 140 can be less than or equal to 260 MKSrayls. Specifically, the porosity of the acoustic barrier mesh 140 can be greater than or equal to 13%; and / or, the pore size can be greater than or equal to 18 μm.

[0099] As an example, combined Figure 9The acoustic barrier 140 can be woven from yarn, and factors such as the yarn diameter and density affect the acoustic resistance of the acoustic barrier 140. Based on this, every four intersecting yarns arranged longitudinally and laterally can form a pore. The area enclosed by the center line of the yarn can be defined as S1, and the area actually enclosed by the edges of the yarn (i.e., the pore) can be defined as S2; therefore, the porosity can be defined as S2 / S1. Furthermore, the pore size can be expressed as the spacing between any two adjacent yarns, such as the side length of the pore.

[0100] Furthermore, the effective area of ​​a specific through-hole or opening introduced below in this application can be defined as the product of its actual area and the porosity of the covering acoustic barrier. For example, when the outlet end of the sound guiding channel 141 is covered with an acoustic barrier 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 barrier 140; while when the outlet end of the sound guiding channel 141 is not covered with an acoustic barrier 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 area of ​​the outlet end of through-holes such as pressure relief holes and sound adjustment holes mentioned later can also be defined as the product of the actual area and the corresponding porosity, which will not be elaborated here.

[0101] Based on the above description, in addition to bone conduction sound, users mainly hear air conduction sound output to the outside of the earphone 100 through the sound outlet 113 and the sound guide channel 141, rather than 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 guide channel 141 can be designed to be larger than that of the pressure relief hole 114.

[0102] Furthermore, the size of the pressure relief hole 114 affects the smoothness of exhaust from the front cavity 111, the ease with which the diaphragm 13 vibrates, and consequently the acoustic performance of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113. Therefore, given a fixed effective area at the outlet end of the sound guide channel 141, such as a fixed actual area at the outlet end of the sound guide channel 141 and / or a fixed porosity of the acoustic barrier mesh 140, by adjusting the effective area at the outlet end of the pressure relief hole 114 (e.g., the actual area at the outlet end of the pressure relief hole 114 and / or the acoustic resistance of the acoustic barrier mesh 1140 covering it), the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 can be varied, in accordance with the table below. In this application, an acoustic resistance of 0 can be simply considered as the absence of an acoustic barrier mesh.

[0103] Frequency response curve <![CDATA[Actual area / mm 2 > Acoustic Resistance / MKSrayls Porosity 10-1 31.57 0 100％ 10-2 2.76 0 100％ 10-3 2.76 1000 3％

[0104] Combination Figure 10As 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 or mid-low-frequency range increases significantly. As the acoustic barrier 1140 is added to the outlet end of the pressure relief hole 114, the exhaust of the front cavity 111 is affected to some extent, causing the mid-low frequency of the air-conducted sound output to the outside of the headphone 100 through the sound outlet 113 to decrease, and the frequency response curve becomes relatively flat.

[0105] Referring to the table below, by adjusting the actual area of ​​the outlet end of the pressure relief hole 114 and the acoustic resistance of the acoustic barrier mesh 1140 covering it, combinations of pressure relief holes 114 of different sizes and acoustic barrier meshes 1140 of different acoustic resistances can be achieved, thereby making the frequency response curves of the air-conducted sound output to the outside of the earphone 100 through the sound outlet hole 113 approximately consistent. Wherein, if the acoustic barrier mesh 1140 with a porosity of 14% can be simply regarded as a single-layer mesh, then the acoustic barrier mesh 1140 with a porosity of 7% can be simply regarded as a double-layer mesh.

[0106]

[0107] Combination Figure 11 The larger the actual area of ​​the outlet end of the pressure relief hole 114, the greater the acoustic resistance of the corresponding acoustic barrier should be, so that the effective area of ​​the outlet end of the pressure relief hole 114 can be kept roughly the same, so that the exhaust flow of the front cavity 111 is roughly the same, and thus the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the sound outlet 113 is roughly the same. However, combined with Figure 12 Although the frequency response curves of the air-conducted sound output through the sound outlet 113 to the outside of the earphone 100 are generally consistent, the frequency response curves of the air-conducted sound output through the pressure relief hole 114 to the outside of the earphone 100 are different, meaning the sound leakage at the pressure relief hole 114 is different. Specifically, as the actual area of ​​the outlet end of the pressure relief hole 114 increases and the acoustic resistance of the acoustic barrier 1140 increases, the frequency response curve of the air-conducted sound output through the pressure relief hole 114 to the outside of the earphone 100 shifts downward overall, meaning the sound leakage at the pressure relief hole 114 decreases accordingly. In other words, while ensuring that the frequency response curve of the air-conducted sound at the sound-conducting component 14 remains roughly unchanged, the size of the pressure relief hole 114 can be increased as much as possible, and the acoustic resistance of the acoustic barrier 1140 on the pressure relief hole 114 can be increased simultaneously to minimize the sound leakage at the pressure relief hole 114. Therefore, it can be seen that ensuring the effective area of ​​the outlet end of the pressure relief hole 114 is less than or equal to 2.76 mm² is crucial. 2 Under the premise that the actual area of ​​the outlet end of the pressure relief hole 114 and the porosity of the acoustic barrier 1140 can be increased, the sound leakage at the pressure relief hole 114 can be reduced.

[0108] 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. Therefore, the pressure relief hole 114 can be configured as at least one or at least two, such as the three described below.

[0109] Based on the detailed description above, the effective area of ​​the outlet end of the sound guide channel 141 can be larger 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 headphone 100 through the sound outlet 113. Specifically, based on the definition of effective area, the actual area of ​​the outlet end of the sound guide channel 141 can be larger than the actual area of ​​the outlet end of each pressure relief hole 114. Further, the effective area of ​​the outlet end of the sound guide channel 141 can be greater than or equal to the sum of the effective areas of the outlet ends of all pressure relief holes 114. The ratio between the sum of the effective areas of the outlet ends of all pressure relief holes 114 and the effective area of ​​the outlet end of the sound guide channel 141 can be greater than or equal to 0.15. As an example, the effective area of ​​the outlet end of all pressure relief holes 114 can be greater than or equal to 2.5 mm. 2 This ensures smooth exhaust from the front chamber 111, thereby improving the acoustic performance of the air-conducted sound output to the outside of the headphones 100 via the sound outlet 113, and reducing sound leakage at the pressure relief hole 114.

[0110] As an example, the actual area of ​​the outlet end of the sound guide channel 141 can be greater than or equal to 4.8 mm. 2 Preferably, the actual area of ​​the outlet end of the sound guide channel 141 can be greater than or equal to 8 mm². 2 Accordingly, the sum of the actual areas of the outlet ends of all pressure relief holes 114 can be greater than or equal to 2.6 mm. 2 Preferably, the actual area of ​​the outlet end of all pressure relief holes 114 can be greater than or equal to 10 mm². 2 When there is only one pressure relief hole 114, the sum of the actual areas of the outlet ends of all pressure relief holes 114 is equal to the actual area of ​​the outlet end of one pressure relief hole 114; the same applies to the sound tuning hole 117. In one specific embodiment, the actual area of ​​the outlet end of the sound guiding channel 141 can be 25.3 mm². 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. The actual area of ​​their outlet ends can be 11.4 mm², respectively. 2 8.4mm 2 5.8mm 2 .

[0111] Furthermore, the outlet end of the sound guiding channel 141 may be covered with an acoustic barrier mesh 140, and at least part of the outlet end of the pressure relief hole 114 may be covered with an acoustic barrier mesh 1140. The porosity of the acoustic barrier mesh 1140 may be less than or equal to its porosity. In one specific embodiment, the porosity of the acoustic barrier mesh 140 may be greater than or equal to 13%, and the porosity of the acoustic barrier mesh 1140 may be greater than or equal to 7%.

[0112] Based on the above description, the sound guide channel 141 is connected to the rear cavity 112 through the sound outlet 113, forming a typical Helmholtz resonant cavity structure with a resonance peak. We can study the sound pressure distribution in the rear cavity 112 when the Helmholtz resonant cavity structure resonates. Specifically, combining... Figure 13 In (a), a high-pressure region far from the sound outlet 113 and a low-pressure region close to the sound outlet 113 are formed within the rear cavity 112. Furthermore, when the Helmholtz resonant cavity structure resonates, a standing wave can be considered to appear within the rear cavity 112. The wavelength of the standing wave corresponds to the size of the rear cavity 112; for example, the deeper the rear cavity 112, that is, the longer the distance between the low-pressure and high-pressure regions, the longer the wavelength of the standing wave, resulting in a lower resonant frequency of the Helmholtz resonant cavity structure. Based on this, combined with... Figure 13 In (b), by disrupting the high-voltage region, for example by creating a through-hole in the high-voltage region that connects to the rear cavity 112, the sound that would normally be reflected in the high-voltage region cannot be reflected, thus preventing the formation of the aforementioned standing wave. At this time, when the Helmholtz resonant cavity structure resonates, the high-voltage region within the rear cavity 112 shifts inward toward the low-voltage region, shortening the wavelength of the standing wave and thereby increasing the resonant frequency of the Helmholtz resonant cavity structure.

[0113] Combination Figure 2 The housing 11 of the mechanism may also be provided with a tuning hole 117 communicating with the rear cavity 112. Under the same conditions, the tuning hole 117 located in the high-voltage zone within the rear cavity 112 can most effectively disrupt the high-voltage zone. Of course, the tuning hole 117 can also be located in any region between the high-voltage zone and the low-voltage zone within the rear cavity 112. As an example, the tuning hole 117 can be located in the rear shell 115 and can be arranged opposite to the sound outlet 113 and its sound guiding component 14 on both sides of the transducer 12.

[0114] Furthermore, combined Figure 14 The frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the sound outlet 113 has a resonant peak. Referring to the table below, without an acoustic barrier, adjusting the actual area of ​​the outlet end of the tuning hole 117 can control the degree of disruption to the high-voltage region caused by the tuning hole, thereby adjusting the peak resonant frequency of the resonant peak. Where the actual area of ​​the outlet end of the tuning hole 117 is 0, it can be considered that the tuning hole 117 is in a closed state.

[0115] Frequency response curve <![CDATA[Actual area / mm 2 > 14-1 0 14-2 1.7 14-3 2.8 14-4 28.44

[0116] Combination Figure 14The larger the actual area of ​​the outlet end of the tuning hole 117, the more significant the destructive effect on the aforementioned high-voltage region, and the higher the peak resonant frequency of the resonance peak. Specifically, the peak resonant frequency of the resonance peak when the tuning hole 117 is in the open state is shifted to a higher frequency compared to the peak resonant frequency when the tuning hole 117 is in the closed state, and the shift can be greater than or equal to 500Hz. Preferably, the aforementioned shift is greater than or equal to 1kHz. Further, the peak resonant frequency of the resonance peak when the tuning hole 117 is in the open state can be greater than or equal to 2kHz, resulting in better voice output performance for the headphones 100. Preferably, the peak resonant frequency can be greater than or equal to 3.5kHz, resulting in better music output performance for the headphones 100; the peak resonant frequency can also be further greater than or equal to 4.5kHz.

[0117] It should be noted that due to the limited size of the movement housing 11, the individual tuning hole 117 cannot be too large. Therefore, the tuning hole 117 can be configured as at least one, such as the two described below.

[0118] Similarly, in addition to bone conduction sound, users mainly hear air conduction sound output to the outside of the earphone 100 through the sound outlet 113, rather than air conduction sound output to the outside of the earphone 100 through the tuning hole 117. Therefore, the effective area of ​​the outlet end of the sound channel 141 can be designed to be larger than that of the tuning hole 117.

[0119] Combination Figure 14 and Figure 13 Because a tuning port 117 is added to the rear cavity 112, some sound leaks out through the tuning port 117, resulting in sound leakage at the tuning port 117. This causes the frequency response curve of the air-conducted sound output to the outside of the earphone 100 via the sound outlet 113 to shift downwards overall. Therefore, in conjunction with... Figure 2 At least part of the outlet end of the tuning hole 117 can be covered with a sound-blocking mesh 1170 to minimize sound leakage from the tuning hole 117 while disrupting the high-voltage zone within the rear cavity 112. Referring to the table below, adjusting the effective area of ​​the outlet end of the tuning hole 117, such as the actual area of ​​the outlet end of the tuning hole 117 and / or the sound resistance of the sound-blocking mesh 1170 covering it, can change the air-conducted sound output to the outside of the headphone 100 via the sound outlet 113.

[0120] Frequency response curve Acoustic Resistance / MKSrayls 15-1 No tuning port 15-2 0 15-3 145

[0121] Combination Figure 15An acoustic barrier 1170 is added to the outlet end of the tuning hole 117. This ensures that there is no significant reflected sound at the tuning hole 117 within the rear cavity 112 (i.e., no standing waves, no hard sound field boundary), causing the high-voltage zone within the rear cavity 112 to shift inward. It also prevents sound leakage from the tuning hole 117 to a certain extent, allowing more sound to be output to the outside of the earphone 100 through the outlet hole 113. Furthermore, the peak resonance intensity in the mid-low frequency range increases significantly, increasing the volume of air-conducted sound; the peak resonance intensity in the high frequency range also decreases to some extent, making the frequency response curve flatter in the high-frequency range and resulting in a more balanced high-frequency sound quality.

[0122] Based on the detailed description above, the effective area of ​​the outlet end of the sound guide channel 141 can be larger than the effective area of ​​the outlet end of each tuning hole 117, so that the user can hear the air-conducted sound output to the outside of the headphone 100 through the sound outlet 113. Specifically, based on the definition of effective area, the actual area of ​​the outlet end of the sound guide channel 141 can be larger than the actual area of ​​the outlet end of each tuning hole 117. Further, the effective area of ​​the outlet end of the sound guide channel 141 can be larger than the sum of the effective areas of the outlet ends of all tuning holes 117. The ratio between the sum of the effective areas of the outlet ends of all tuning holes 117 and the effective area of ​​the outlet end of the sound guide channel 141 can be greater than or equal to 0.08. For example, the sum of the effective areas of the outlet ends of all tuning holes 117 can be greater than or equal to 1.5 mm. 2 When there is only one tuning hole 117, the sum of the effective areas of the outlet ends of all tuning holes 117 is equal to the effective area of ​​the outlet end of one tuning hole 117; the pressure relief hole 114 is similar. In this way, the peak resonant frequency of the air-conducted sound output to the outside of the headphone 100 through the sound outlet 113 can be shifted as high as possible, and sound leakage at the tuning hole 117 can also be reduced.

[0123] As an example, the sum of the actual areas of the outlet ends of all the tuning holes 117 can be greater than or equal to 5.6 mm. 2 In one specific embodiment, two tuning holes 117 can be provided, such as the first tuning hole 1171 and the second tuning hole 1172 mentioned later, whose actual outlet area can be 7.6 mm² respectively. 2 5.6mm 2 .

[0124] Furthermore, the outlet end of the sound guiding channel 141 may be covered with an acoustic barrier mesh 140, and at least part of the outlet end of the sound tuning hole 117 may be covered with an acoustic barrier mesh 1170. The porosity of the acoustic barrier mesh 1170 may be less than or equal to the porosity of the acoustic barrier mesh 140. In one specific embodiment, the porosity of the acoustic barrier mesh 140 may be greater than or equal to 13%, and the porosity of the acoustic barrier mesh 1170 may be less than or equal to 16%.

[0125] Based on the above description, for the pressure relief hole 114 and the sound outlet hole 113, the phases of the air-conducted sound output to the outside of the headphone 100 through them are opposite. Therefore, the pressure relief hole 114 and the sound outlet hole 113 should be staggered as much as possible in three-dimensional space to avoid coherent cancellation of the air-conducted sound output to the outside of the headphone 100 through them. For this purpose, the pressure relief hole 114 should be as far away from the sound outlet hole 113 as possible. For the tuning hole 117 and the sound outlet hole 113, if the area where the sound outlet hole 113 is located can be simply considered as a low-pressure area within the rear cavity 112, then the area within the rear cavity 112 farthest from the area where the sound outlet hole 113 is located can be simply considered as a high-pressure area within the rear cavity 112. The tuning hole 117 can preferably be located within the high-pressure area of ​​the rear cavity 112 to disrupt the original high-pressure area and move it towards a low-pressure area. Therefore, the tuning hole 117 should be as far away from the sound outlet hole 113 as possible.

[0126] Furthermore, since the pressure relief hole 114 is connected to the front cavity 111 and the tuning hole 117 is connected to the rear cavity 112, the air-conducted sound output to the outside of the headphone 100 through the pressure relief hole 114 and the tuning hole 117 respectively has opposite phases. Therefore, sound leakage from the pressure relief hole 114 and the tuning hole 117 can be reduced through coherent cancellation. Based on this, at least a portion of the pressure relief hole 114 and at least a portion of the tuning hole 117 can be arranged adjacent to each other to create conditions for coherent cancellation. In order to better achieve coherent cancellation of sound leakage from the pressure relief hole 114 and the tuning hole 117, the distance between them should be as small as possible. For example, the minimum distance between the contours of the outlet ends of the pressure relief hole 114 and the tuning hole 117 should be less than or equal to 2 mm. In addition, the peak resonant frequencies and / or peak resonant intensities of the air-conducted sound output to the outside of the headphone 100 through the pressure relief hole 114 and the tuning hole 117 respectively should also be matched as much as possible. However, in actual product design, due to the influence of specific structure and process tolerances, it is generally difficult to control the peak resonant frequency and / or peak resonant intensity of the resonant peaks of the two air-conducting sound paths to be exactly the same. Therefore, in the design, we should try to ensure that the peak resonant frequency and / or peak resonant intensity of the resonant peaks of the two air-conducting sound paths are not too different.

[0127] Combination Figure 16The 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 resonant peak f1, and the frequency response curve of the air-conducted sound output to the outside of the earphone 100 through the tuning hole 117 has a second resonant peak f2. Referring to the table below, the peak resonant frequencies of the first and second resonant peaks can each be greater than or equal to 2kHz, and |f1-f2| / f1≤60%. As the difference between the peak resonant frequencies of the first and second resonant peaks gradually decreases, the bandwidth for reducing sound leakage becomes wider, meaning the frequency response curve becomes relatively flatter, resulting in a further reduction in sound leakage from the earphone 100. This also means a better effect of coherent cancellation of the air-conducted sound output to the outside of the earphone 100 through the pressure relief hole 114 and the tuning hole 117. Preferably, the peak resonant frequencies of the first and second resonant peaks can each be greater than or equal to 3.5kHz, and |f1-f2|≤2kHz. In this way, the air-conducted sound output to the outside of the headphone 100 through the pressure relief hole 114 and the sound tuning hole 117 respectively can coherently cancel each other out in the high-frequency range.

[0128] Frequency response curve peak resonant frequency of f1 / Hz peak resonant frequency of f2 / Hz 16-1 3500 5600 16-2 4500 5600 16-3 5000 5600

[0129] Furthermore, because the front cavity 111 contains structural components such as the coil support 121 and the spring plate 124, the wavelength of the standing wave in the front cavity 111 is relatively long; the tuning hole 117 and the sound outlet 113 can mutually disrupt the high-voltage region, resulting in a relatively short wavelength of the standing wave in the rear cavity 112. Thus, the peak resonant frequency of the first resonant peak is generally lower than the peak resonant frequency of the second resonant peak. To ensure better coherence and cancellation of the air-conducted sound output to the outside of the earphone 100 via the pressure relief hole 114 and the tuning hole 117, the peak resonant frequency of the first resonant peak should be shifted as high as possible to be as close as possible to the peak resonant frequency of the second resonant peak. Therefore, based on the Helmholtz resonant cavity model, the effective area of ​​the outlet end of the pressure relief hole 114 in the adjacent pressure relief hole 114 and the tuning hole 117 can be larger than the effective area of ​​the outlet end of the tuning hole 117. In this configuration, 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 adjustment hole 117 in adjacent configurations 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 adjacent configurations can be greater than the actual area of ​​the outlet end of the sound adjustment hole 117. Furthermore, the outlet ends of the adjacent configurations of the pressure relief hole 114 and the sound adjustment hole 117 can be respectively covered with a sound-absorbing mesh 1140 and a sound-absorbing mesh 1170, where the porosity of the sound-absorbing mesh 1140 can be greater than that of the sound-absorbing mesh 1170.

[0130] Combination Figure 17In (a), the pressure relief hole 114 may include a first pressure relief hole 1141 and a second pressure relief hole 1142. The first pressure relief hole 1141 is positioned further away from the sound outlet hole 113 than the second pressure relief hole 1142. In this case, 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 second pressure relief hole 1142. This balances the size of the movement housing 11 and the exhaust requirements of the front cavity 111, while also ensuring that the first pressure relief hole 1141, with its relatively large exhaust volume, is positioned as far away from the sound outlet hole 113 as possible, thereby reducing the impact of sound leakage at the pressure relief hole 114 on the air-guided sound at the sound outlet hole 113. Furthermore, the pressure relief hole 114 may also include a third pressure relief hole 1143, and the first pressure relief hole 1141 is also positioned further away from the sound outlet hole 113 than the third pressure relief hole 1143. 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 third pressure relief hole 1143.

[0131] As an example, combined Figure 17 (a) and Figure 2 The sound outlet 113 and the first pressure relief hole 1141 can be located on opposite sides of the transducer 12; while the second pressure relief hole 1142 and the third pressure relief hole 1143 can be arranged opposite each other and can be located between the sound outlet 113 and the first pressure relief hole 1141.

[0132] Furthermore, at least a portion of the outlet end of the pressure relief hole 114 can be covered with an acoustic barrier mesh 1140 to facilitate adjustment of the effective area of ​​the outlet end of the pressure relief hole 114. In this embodiment, an example is provided where the outlet ends of the pressure relief holes 114 are covered with acoustic barrier meshes 1140 of the same acoustic resistance. This not only improves the acoustic performance and waterproof / dustproof capabilities of the headphones 100 but also prevents the acoustic barrier meshes 1140 from becoming mixed due to an excessive variety of specifications. Based on this, adjusting the actual area of ​​the outlet end of the pressure relief hole 114 yields the corresponding effective area. For example, the actual area of ​​the outlet end of the first pressure relief hole 1141 can 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 can also be larger than the actual area of ​​the outlet end of the third pressure relief hole 1143.

[0133] Combination Figure 17In (b), the tuning hole 117 may include a first tuning hole 1171 and a second tuning hole 1172. The first tuning hole 1171 is positioned further away from the sound outlet 113 than the second tuning hole 1172. In this case, the effective area of ​​the outlet end of the first tuning hole 1171 can be larger than the effective area of ​​the outlet end of the second tuning hole 1172, in order to disrupt the high-pressure zone within the rear cavity 112. This balances the size of the mechanism housing 11 with the requirement for the tuning hole 117 to disrupt the high-pressure zone of the rear cavity 112, and maximizes the resonant frequency of the air-conducted sound at the sound outlet 113, while also ensuring that the first tuning hole 1171, which has a relatively greater disruptive effect, is positioned as far away from the sound outlet 113 as possible.

[0134] As an example, combined Figure 17 (b) and Figure 2 The sound outlet 113 and the first tuning port 1171 can be located on opposite sides of the transducer 12; while the second tuning port 1172 can be located between the sound outlet 113 and the first tuning port 1171.

[0135] Furthermore, at least a portion of the outlet end cap of the tuning hole 117 may be provided with an acoustic barrier mesh 1170 to facilitate adjustment of the effective area of ​​the outlet end of the tuning hole 117. This embodiment exemplifies this by providing acoustic barrier meshes 1170 with the same acoustic resistance at the outlet ends of the tuning holes 117. This not only improves the acoustic performance and waterproof / dustproof capabilities of the headphones 100 but also prevents the acoustic barrier meshes 1170 from becoming mixed due to a large variety of specifications. Based on this, adjusting the actual area of ​​the outlet end of the tuning hole 117 yields the corresponding effective area. For example, the actual area of ​​the outlet end of the first tuning hole 1171 can be larger than the actual area of ​​the outlet end of the second tuning hole 1172. Specifically, the actual area of ​​the outlet end of the first tuning hole 1171 can be greater than or equal to 3.8 mm. 2 ; and / or, the actual area of ​​the outlet end of the second tuning port 1172 can be greater than or equal to 2.8 mm. 2 .

[0136] As an example, combined Figure 17 In (c) and (d), the first pressure relief hole 1141 and the first sound tuning hole 1171 can be arranged adjacent to each other, and the second pressure relief hole 1142 and the second sound tuning hole 1172 can also be arranged adjacent to each other. In this way, the air-conducted sound output to the outside of the earphone 100 through the first pressure relief hole 1141 and the first sound tuning hole 1171 respectively can coherently cancel each other out, and the air-conducted sound output to the outside of the earphone 100 through the second pressure relief hole 1142 and the second sound tuning hole 1172 respectively can also coherently cancel each other out.

[0137] Furthermore, 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 tuning hole 1171, so that the peak resonant frequency of the air-conducted sound output to the outside of the earphone 100 through the first pressure relief hole 1141 is shifted as high as possible, so as to be as close as possible to the peak resonant frequency of the air-conducted sound output to the outside of the earphone 100 through the first 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 tuning hole 1171 respectively to better coherently cancel each other out. 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 tuning hole 1172, which will not be elaborated further here.

[0138] Similar to how the tuning port 117 disrupts the high-voltage region within the rear cavity 112, the second pressure relief port 1142 and the third pressure relief port 1143 disrupt the high-voltage region within the front cavity 111, reducing the wavelength of the standing wave within the front cavity 111. This causes the peak resonant frequency of the air-conducted sound output to the outside of the earphone 100 via the first pressure relief port 1141 to shift towards higher frequencies, allowing for better coherence and cancellation with the air-conducted sound output to the outside of the earphone 100 via the first tuning port 1171. The shift can be greater than or equal to 500Hz, and the peak resonant frequency of the resonant peak can be greater than or equal to 2kHz. Preferably, the shift is greater than or equal to 1kHz. Similarly, the peak resonant frequency of the air-conducted sound output to the outside of the earphone 100 via the second pressure relief port 1142 can also shift towards higher frequencies. 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 tuning hole 117 has a resonance peak. The peak resonant frequency of the resonance peak of other pressure relief holes 114 (excluding the one adjacent to the tuning hole 117) when they are open is shifted to a higher frequency compared to the peak resonant frequency of the resonance peak when they are closed. The peak resonant frequency of the resonance peak when other pressure relief holes 114 are open can be greater than or equal to 2kHz.

[0139] Combination Figure 17 and Figure 2The mechanism housing 11 may include a first sidewall 17A and a second sidewall 17B located on opposite sides of the transducer 12, and a third sidewall 17C and a fourth sidewall 17D connecting the first sidewall 17A and the second sidewall 17B and spaced apart from each other. In short, the mechanism housing 11 can be simplified as a rectangular frame. Of course, the third sidewall 17C and the fourth sidewall 17D may also be arc-shaped, so that the mechanism housing 11 has an overall racetrack-shaped configuration. The first sidewall 17A is closer to the ear than the second sidewall 17B, and the third sidewall 17C is closer to the ear hook assembly 20 than the fourth sidewall 17D. Furthermore, the sound outlet 113 may be located on the first sidewall 17A, so that the user can hear the air-conducted sound output to the outside of the earphone 100 through the sound outlet 113 and the sound guide channel 141; the first pressure relief hole 1141 and the first tuning hole 1171 may be located on the second sidewall 17B, so that they are further away from the sound outlet 113. Accordingly, the second pressure relief hole 1142 and the second sound adjustment hole 1172 can be respectively provided in one of the third side wall 17C and the fourth side wall 17D, and the third pressure relief hole 1143 can be provided in the other of the third side wall 17C and the fourth side wall 17D.

[0140] Based on the above descriptions, and in conjunction with Figure 2 and Figure 17 The pressure relief hole 114 allows the front cavity 111 to communicate with the outside of the earphone 100, and the tuning hole 117 allows the rear cavity 112 to communicate with the outside of the earphone 100. Furthermore, at least some of the pressure relief holes 114 and at least some of the tuning holes 117 can be arranged adjacent to each other, with a distance between them less than or equal to 2mm. For example, the first pressure relief hole 1141 is arranged adjacent to the first tuning hole 1171, and the second pressure relief hole 1142 is arranged adjacent to the second tuning hole 1172. Based on this, the mechanism module 10 can also include a protective cover 15, which can cover the periphery of the pressure relief holes 114 and the tuning holes 117. The protective cover 15 can be made of woven metal wire with a wire diameter of 0.1mm and a mesh count of 90-100, giving it a certain structural strength and good air permeability. This prevents foreign objects from entering the interior of the mechanism module 10 without affecting the acoustic performance of the earphone 100. In this way, the protective cover 15 can cover the adjacent pressure relief hole 114 and the sound tuning hole 117 at the same time, that is, "one cover covers two holes", which greatly reduces the material and improves the appearance quality of the headphones 100.

[0141] As an example, combined Figure 18The outer surface of the housing 11 can be provided with a receiving area 118, which can communicate with the outlet ends of the adjacent pressure relief hole 114 and the tuning hole 117. In this case, the protective cover 15 can be plate-shaped and fixed within the receiving area 118 by one or a combination of connection methods such as snap-fit, adhesive bonding, or welding, for example, by adhesive bonding or welding to the bottom of the receiving area 118 to cover the pressure relief hole 114 and the tuning hole 117. The outer surface of the protective cover 15 can be flush with or rounded to the outer surface of the housing 11 to improve the appearance of the earphone 100.

[0142] Furthermore, a boss 1181 may be formed within the receiving area 118, with the boss 1181 spaced apart from the sidewall of the receiving area 118 to form a receiving groove 1182 surrounding the boss 1181. The width of the receiving groove 1182 may be less than or equal to 0.3 mm. In this case, the outlet ends of the pressure relief hole 114 and the sound adjustment hole 117 are located at the top of the boss 1181, meaning the receiving 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, with the annular side plate 152 bent and connected to the edge of the main cover plate 151 to extend laterally towards the main cover plate 151. 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 within the receiving area 118, the annular side plate 152 can also be inserted and fixed within the receiving 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 via an adhesive (not shown in the figure) within the receiving groove 1182. Furthermore, the main cover plate 151 can also be connected to the top of the boss 1181 by welding. The top of the boss 1181 can be slightly lower than the outer surface of the movement housing 11, for example, the difference in height between them is approximately equal to the thickness of the main cover plate 151.

[0143] Based on the above descriptions, and in conjunction with Figure 18 and Figure 2The outlet ends of the pressure relief hole 114 and the tuning hole 117 can be covered with acoustic barrier meshes 1140 and 1170 respectively, to adjust the effective area of ​​the outlet ends of the pressure relief hole 114 and the tuning hole 117, thereby improving the acoustic performance of the headphone 100. At this time, the acoustic barrier meshes 1140 and 1170 can be first fixed to the top of the boss 1181 by the first annular film 1183, and the protective cover 15 can then be fixed within the receiving area 118. The first annular film 1183 surrounds the pressure relief hole 114 and the tuning hole 117 to expose their outlet ends. Furthermore, the main cover plate 151 can also be fixed to the acoustic barrier meshes 1140 and 1170 by the second annular film 1184. The widths of the first annular film 1183 and the second annular film 1184 can be between 0.4 mm and 0.5 mm, and their thicknesses can be less than or equal to 0.1 mm. Alternatively, in other embodiments, the acoustic barrier mesh 1140 and 1170 can be pre-fixed to the protective cover 15 to form a structural assembly, which is then fixed within the receiving area 118. For example, the acoustic barrier mesh 1140 and 1170 can be fixed to the same side of the main cover plate 151 via the second annular film 1184 and surrounded by the annular side plate 152, thus forming a structural assembly with the protective cover 15. The acoustic barrier mesh 1140 and 1170 can be at least partially offset from each other to cover the outlet ends of the adjacent pressure relief hole 114 and the sound adjustment hole 117, and to accommodate the spacing between them.

[0144] It should be noted that: combination Figure 2 The end of the sound guiding component 14 away from the core housing 11 can also be fixed with a sound barrier 140 and a corresponding protective cover 15 in the same or similar manner as any of the above methods, so that the sound barrier 140 can be placed on the outlet end of the sound guiding channel 141 and covered by the corresponding protective cover 15.

[0145] Combination Figure 19 and Figure 2 The coil support 121 can be exposed laterally from the front housing 116 in a direction perpendicular to the engagement direction of the rear housing 115 and the front housing 116. In other words, combined with Figure 4 For the front housing 116, the side of its front cylindrical side plate 1162 adjacent to the sound outlet 113 or the sound guide component 14 can be at least partially cut off to form a clearance area for the exposed coil support 121. Furthermore, the sound guide component 14 can be fastened to the exposed portion of the coil support 121 and the outer side of the rear housing 115, allowing the sound outlet channel 141 to communicate with the sound outlet 113. In this way, the side of the front housing 116 adjacent to the sound guide component 14 does not need to completely cover the coil support 121, thus avoiding excessive local thickness of the mechanism module 10 and not hindering the fixation between the sound guide component 14 and the mechanism housing 11.

[0146] As an example, the exposed portion of the coil support 121 can mate with the outer surface of the rear housing 115 to form a boss 119. The boss 119 may include a first sub-boss portion 1191 located on the rear housing 115 and a second sub-boss portion 1192 located on the coil support 121. In this case, the sound outlet 113 can be entirely located on the rear housing 115, and the outlet end of the sound outlet 113 can be located at the top of the first sub-boss portion 1191. Correspondingly, the sound guiding member 14 can have a recessed area 142 on the side facing the coil support 121 and the rear housing 115. In this case, the inlet end of the sound guiding channel 141 can communicate with the bottom of the recessed area 142. Thus, when the sound guiding member 14 is assembled with the mechanism housing 11, the boss 119 can be embedded in the recessed area 142, allowing the sound outlet channel 141 to communicate with the sound outlet 113. 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 face of the sound guiding component 14 is in contact with the housing 11 of the mechanism, or a gap is left between them to improve the airtightness between the sound guiding channel 141 and the sound outlet 113. Based on this, an annular seal (not shown in the figure) can also be provided between the top of the boss 119 and the bottom of the recessed area 142.

[0147] Furthermore, one of the rear housing 115 and the sound guiding component 14 may be provided with a connector hole 1154; correspondingly, the other may be provided with a connector post 143. The connector post 143 can be inserted and fixed within the connector hole 1154 to improve the accuracy and reliability of the assembly of the sound guiding component 14 and the mechanism housing 11. As an example, the connector hole 1154 is located in the rear housing 115, specifically in the first sub-protrusion portion 1191; the connector post 143 is located in the sound guiding component 14, specifically in the recessed area 142.

[0148] It should be noted that: combination Figure 19 The sound guide component 14 and the mechanism housing 11 can be along Figure 19 Assemble in the direction indicated by the dashed line.

[0149] In some embodiments, for example, where the movement module 10 does not have a diaphragm 13, the front housing 116 can press the coil support 121 onto the annular support 1153 to improve the reliability of the movement module 10 assembly. 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 onto the annular support 1153.

[0150] In other embodiments, for example, the movement module 10 is provided with a diaphragm 13, and the front housing 116 can press the coil support 121 and the diaphragm 13 connected thereto onto the annular support 1153 together to improve the reliability of the movement module 10 assembly. 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 via its reinforcing ring 136. Specifically, the front housing 116 can press the reinforcing ring 136 onto the annular support 1153 via the second cylindrical support portion 1213.

[0151] As an example, combined Figure 19 and Figure 4 The sound-adjusting hole 117 can be provided as a complete through hole in the rear housing 115; while the pressure relief hole 114 can be provided as an incomplete notch in the front housing 116, and a complete through hole can be formed by splicing the rear housing 115 and the front housing 116. In this way, it is convenient to reduce the spacing between adjacent pressure relief holes 114 and sound-adjusting holes 117, and it is 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-adjusting hole 117.

[0152] Furthermore, combined Figure 29 and Figure 2 A connecting hole 1215 can be provided at the connection between the annular main body 1211 and the first cylindrical support 1212, so that the air in the front cavity 111 does not need to bypass the coil support 121 and coil 123 during the exhaust process, but passes directly through the coil support 121. This not only increases the exhaust efficiency of the front cavity 111, but also reduces the wavelength of the standing wave in the front cavity 111, thereby causing the peak resonant 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. Of course, the connecting holes 1215 can all be located in the annular main body 1211 or the first cylindrical support 1212. Furthermore, there can be multiple connecting holes 1215, which are spaced apart along the circumferential direction of the coil assembly. The cross-sectional area of ​​each connecting hole 1215 can be greater than or equal to 2 mm. 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, which is respectively adjacent to the second pressure relief hole 1142 and the third pressure relief hole 1143, can be greater than or equal to 2.5 mm. 2 .

[0153] Combination Figure 1 The earphone 100 may include two mechanism modules 10, which are positioned on the left and right sides of the user's head respectively when the earphone 100 is being worn. Based on this, and in conjunction with... Figure 20 and Figure 21In this embodiment, it can be defined that when the earphone 100 is in the wearing state, the one located on the left side of the user's head among the two core modules 10 is the left earphone core module, for example... Figure 20 As shown; the one located on the right side of the user's head is the right earphone module, for example... Figure 21 As shown. Furthermore, in addition to the transducer 12 and other sound-related structural components, the core module 10 can also house other auxiliary devices such as function buttons and a microphone to enrich and expand the functionality of the earphone 100. Based on general user habits, the function buttons can be located in the left earphone core module, and the microphone can be located in the right earphone core module. The function buttons and microphone can have different sizes. Of course, other arrangements of auxiliary devices are also possible, such as placing one microphone in each of the left and right earphone core modules; these will not be listed here.

[0154] As an example, combined Figure 20 The movement module 10 may include a function button 16 disposed within a cavity in the movement housing 11. The function button 16 may be exposed from the rear housing 115 to facilitate receiving user press operations. The trigger direction of the function button 16 may be substantially consistent with the vibration direction of the transducer 12.

[0155] As an example, combined Figure 21 The mechanism module 10 may include a first microphone 171 disposed within a cavity of the mechanism housing 11. The first microphone 171 is capable of collecting sound from outside the mechanism module 10. The angle between the vibration direction of the first microphone 171 and the vibration direction of the transducer 12 can be between 65 degrees and 115 degrees. This is to prevent the first microphone 171 from undergoing mechanical resonance due to the vibration of the transducer 12, thereby improving the sound pickup effect of the mechanism module 10.

[0156] Furthermore, the mechanism module 10 may also include a second microphone 172 disposed within the accommodating cavity of the mechanism housing 11. The second microphone 172 is capable of collecting sound from outside the mechanism module 10. The angle between the vibration direction of the second microphone 172 and the vibration direction of the first microphone 171 can be between 65 degrees and 115 degrees. Thus, the second microphone 172 and the first microphone 171 can receive two different sounds respectively, or receive the same sound from two different directions, thereby improving the noise reduction and voice call functions of the headset 100. Based on this, the headset 100 may also include a processing circuit (not shown in the figure) integrated on the main control circuit board 40. The processing circuit can use the first microphone 171 as the main microphone, for example, to collect the user's voice, and the second microphone 172 as the auxiliary microphone, for example, to collect ambient sound from the user's environment. The processing circuit uses the sound signal collected by the second microphone 172 to perform noise reduction processing on the sound signal collected by the first microphone 171. The first microphone 171 and the second microphone 172 can be soldered onto the same flexible circuit board to simplify the wiring structure of the mechanism module 10. Preferably, the vibration direction of the first microphone 171 is perpendicular to the vibration direction of the transducer 12, and the vibration direction of the second microphone 172 is perpendicular to the vibration direction of the first microphone 171.

[0157] Based on the above description, the mechanism module 10 may further include a diaphragm 13 connected between the transducer 12 and the mechanism housing 11, enabling the mechanism module 10 to generate both bone conduction sound and air conduction sound. Based on this, and in conjunction with... Figure 20 (or Figure 21 )and Figure 2 The mechanism module 10 may also include a partition 18 disposed within the rear cavity 112 to separate auxiliary components from the rear cavity 112, minimizing the influence of the auxiliary components on the space containing the rear cavity 112. Consequently, the walls surrounding the rear cavity 112 can be made as smooth and rounded as possible, thereby improving the acoustic performance of the air-conducting sound of the earphone 100. In this case, the transducer 12 is located on the side of the partition 18 facing the front cavity 111.

[0158] As an example, the partition 18 can divide the rear cavity 112 into a first sub-rear cavity 1121 located near the front cavity 111 and a second sub-rear cavity 1122 located away from the front cavity 111. The sound outlet 113 and the tuning port 117 can communicate with the first sub-rear cavity 1121, respectively. Auxiliary devices such as the function button 16 and the second microphone 172 can be located within the second sub-rear cavity 1122; while the first microphone 171 can be located within the first sub-rear cavity 1121. Based on this, the function button 16 and the second microphone 171 can be fixed between the rear bottom plate 1151 of the left and right earphone core modules and the corresponding partition 18, respectively. Correspondingly, the first microphone 171 can be fixed within the groove (not shown in the figure) of the rear cylindrical side plate 1152 of the right earphone core module to prevent the transducer 12 from colliding with the first microphone 171 during operational vibration, thereby increasing the reliability of the core module 10. Specifically, for the left earphone module, the partition 18 can be used to withstand the pressing pressure applied by the user to the function button 16.

[0159] Furthermore, the partition 18 can also be used to adjust the size of the first sub-rear cavity 1121, so that the volume of the first sub-rear cavity 1121 of the left earphone module is the same as that of the first sub-rear cavity 1121 of the right earphone module. In this way, the air conduction sound output by the left and right earphone modules tends to be consistent in the frequency response curve, thereby improving the acoustic performance of the earphone 100.

[0160] It should be noted that due to uncontrollable factors such as processing precision and assembly precision, the volume of the first sub-back cavity of the left and right earphone core modules is the same, which also means that a certain difference between the two volumes is allowed, such as less than or equal to 10%.

[0161] Furthermore, the second sub-rear cavity 1122 may be filled with a colloid (not shown in the figure). The colloid may occupy a filling rate of 90% or greater in the second sub-rear cavity 1122, making the second sub-rear cavity 1122 as solid as possible. This avoids the second sub-rear cavity 1122 being a hollow structure, which would cause acoustic resonance with the first sub-rear cavity 1121, thereby improving the acoustic performance of the earphone 100.

[0162] As an example, the partition 18 can be made of a light-transmitting material; correspondingly, the adhesive to be filled can be a light-curing adhesive, which can be cured under light. The partition 18 can be pre-fixed to the rear housing 115 using a hot-melt column. Furthermore, the gap between the side of the partition 18 and the rear housing 115 can also be filled together using a light-curing adhesive. Similarly, the groove in the rear cylindrical side plate 1152 can also be filled with a light-curing adhesive or other adhesive after accommodating the second microphone 172.

[0163] Furthermore, combined Figure 20 (or Figure 21 )and Figure 2 In the vibration direction of the transducer 12, the outer end face of the magnetic shield 1221 facing away from the front cavity 111 is spaced apart from the partition plate 18 to avoid collision between the two during operation of the transducer 12. Furthermore, the distance between the central region of the outer end face of the magnetic shield 1221 and the partition plate 18 can be greater than the distance between the edge region of the outer end face of the magnetic shield 1221 and the partition plate 18. That is, the central region of the first sub-rear cavity 1121 is more spacious than its edge region, thus facilitating airflow within the first sub-rear cavity 1121. Specifically, for the magnetic shield 1221, the central region of the side of its base plate 1223 facing the partition plate 18 can be recessed in the direction away from the partition plate 18 to form an arc surface; and / or, for the partition plate 18, the central region of the side of the partition plate 18 facing the magnetic shield 1221 can be recessed in the direction away from the magnetic shield 1221 to form an arc surface.

[0164] Combination Figure 22 and Figure 1 The ear hook assembly 20 may include a receiving compartment 21, a bending transition portion 22, and a mechanism fixing portion 23. The receiving compartment 21 can accommodate the main control circuit board 40 or the battery 50, the mechanism fixing portion 23 is used to fix the mechanism module 10, and the bending transition portion 22 connects the receiving compartment 21 and the mechanism fixing portion 23. Furthermore, the bending transition portion 22 may be bent to facilitate the ear hook assembly 20 being hung between the user's ear and head.

[0165] As an example, the housing 21 and the mechanism fixing part 23 can be made of plastic, and the bending transition part 22 can have an embedded elastic metal wire. The elastic metal wire and the plastic can be integrally connected by a metal insert molding process. The surface of the ear hook assembly 20 can be an elastic cover to improve the wearing comfort of the earphone 100.

[0166] As an example, the accommodating compartment 21 may include a main compartment body 211 and a cover plate 212. Wherein, combined with Figure 23 The main compartment 211 forms an accommodating space with one open end (not shown in the figure), and the cover plate 212 can be installed on the open end of the main compartment 211. Furthermore, combined with... Figure 24The opening end of the main compartment 211 may be provided with an outer end face 2111, an inner side face 2112, and a transition surface 2113 inclinedly connecting the outer end face 2111 and the inner side face 2112. When the cover plate 212 is placed over the opening end of the main compartment 211, at least a portion of the cover plate 212 and the transition surface 2113 are spaced apart to form a glue-containing space 213 between the cover plate 212 and the transition surface 2113 for containing the adhesive. At this time, the cover plate 212 and the main compartment 211 can be connected through the adhesive (not shown in the figure) within the glue-containing space 213. Thus, compared to related technologies that provide a generally perpendicular annular dispensing stage between the outer end face 2111 and the inner side face 2112, this embodiment can meet dispensing requirements while maximizing the structural strength of the opening end of the main compartment 211, thereby contributing to the thinning of the overall structure of the main compartment 211. The wall thickness of the open end of the main compartment 211 can be between 0.6 mm and 1.0 mm. Alternatively, in other embodiments, when the cover plate 212 is placed over the open end of the main compartment 211, the cover plate 212 and the outer end face 2111 can be connected by welding. In this case, the transition surface 2113 does not need to be provided at the open end of the main compartment 211.

[0167] Furthermore, the transition surface 2113 can be a plane, and can be connected to the outer end face 2111 and the inner side face 2112 at obtuse angles, respectively. The obtuse angle (e.g., θ1) between the transition surface 2113 and the outer end face 2111 can be smaller than the obtuse angle (e.g., θ2) between the transition surface 2113 and the inner side face 2112. This ensures that the volume of the adhesive space 213 meets the dispensing requirements while maximizing the local wall thickness of the opening end of the main chamber 211, thereby increasing the structural strength of the opening end of the main chamber 211. For example, the obtuse angle between the transition surface 2113 and the outer end face 2111 can be between 110 degrees and 135 degrees; or, the obtuse angle between the transition surface 2113 and the inner side face 2112 can be between 135 degrees and 160 degrees.

[0168] It should be noted that the transition surface 2113 may also be provided with a knurled structure to increase its contact area with the colloid, thereby improving the bonding strength between the cover plate 212 and the main chamber 211.

[0169] As an example, combined Figure 23 and Figure 24The cover plate 212 may include a main cover body 2121 and an annular flange 2122 connected to the main cover body 2121. The main cover body 2121 can cover and contact the outer end face 2111 to provide a limiting function; the annular flange 2122 extends into the main compartment body 211. At this time, an adhesive space 213 can be formed between the transition surface 2113 and the lower surface of the main cover body 2121 and the outer surface of the annular flange 2122. Based on this, the main compartment body 211 and the cover plate 212 can be assembled in an inverted manner. For example, an appropriate amount of adhesive can be applied circumferentially along the cover plate 212 using a dispensing machine between the lower surface of the main cover body 2121 and the outer surface of the annular flange 2122, and then the ear hook assembly 20 can be inverted onto the cover plate 212 through the main compartment body 211 to prevent the adhesive from overflowing into the main compartment body 211.

[0170] As an example, combined Figure 23 The receiving compartment 21 may house a main control circuit board 40, on which a switch assembly 41 may be mounted. The switch assembly 41 may include a first fixing part 411, a second fixing part 412, and a switch body 413. The second fixing part 412 may be bent and connected to the first fixing part 411, and the switch body 413 may be mounted on the second fixing part 412. In this configuration, the first fixing part 411 may be fitted to the main surface of the main control circuit board 40, and the two may be soldered together. The second fixing part 412 may be fitted to the side surface of the main control circuit board 40, and the switch body 413 is located on the side of the second fixing part 412 opposite to the main control circuit board 40.

[0171] Furthermore, the main cover 2121 may be provided with a button hole 2123, which may be surrounded by an annular flange 2122. Correspondingly, the ear hook assembly 20 may also include a button assembly 24 fixed to the side of the main cover 2121 opposite to the annular flange 2122. The button assembly 24 is configured to receive the pressing pressure applied by the user and trigger the switch assembly 41 through the button hole 2123. In this case, the pressing direction of the button assembly 24 on the switch assembly 41 may be parallel to the main surface of the main control circuit board 40 to avoid deformation of the main control circuit board 40 in a direction perpendicular to its main surface.

[0172] As an example, combined Figure 22 and Figure 23The side of the main cover 2121 facing away from the annular flange 2122 may also be partially recessed towards the annular flange 2122 to form a placement area 2124, and the button hole 2123 may be disposed within the placement area 2124. Accordingly, the button assembly 24 may include a soft button 241 and a hard button 242 connected to the soft button 241. The soft button 241 is disposed within the placement area 2124 and covers the button hole 2123. At this time, when the user presses the hard button 242, the soft button 241 deforms and travels into the receiving compartment 21 with the avoidance of the button hole 2123, thereby acting on the switch body 413 to trigger the switch assembly 41.

[0173] Furthermore, the soft button 241 may include an integrally connected central protrusion 2411 and an edge connecting portion 2412. The edge connecting portion 2412 is used to connect with the main cover 2121, and the central protrusion 2411 is used to connect with the hard button 242. The depth of the placement area 2124 is greater than the thickness of the edge connecting portion 2412 but less than the thickness of the central protrusion 2411. In this case, the soft button 241 and the cover plate 212 can be integrally connected using a two-color injection molding process. Since the depth of the placement area 2124 is greater than the thickness of the edge connecting portion 2412, glue overflow during the molding process can be avoided. Of course, in some other embodiments, an annular rib surrounding the placement area 2124 can also be provided on the side of the main cover 2121 opposite to the annular flange 2122. The height of this annular rib protruding from the main cover 2121 can be approximately 0.05 mm, and its ring width can be approximately 0.2 mm, so that it can act as a glue-blocking wall during the molding process, similarly preventing glue overflow.

[0174] As an example, combined Figure 23 The number of switch components 41, button holes 2123, and soft buttons 241 can each be two, and each can be configured to correspond one-to-one. Each soft button 241 may have a blind hole (not shown in the figure) in its central protrusion 2411. Correspondingly, the hard button 242 may include an integrally connected pressing part 2421 and a pin 2422. The number of pins 2422 can also be two, with each pin 2422 embedded in a blind hole, and the two can be interference-fitted. Based on this, the two switch components 41 can respectively correspond to the volume up button and volume down button of the headphone 100, and either one can also be extended to serve as the power button of the headphone 100.

[0175] Combination Figure 25 and Figure 26The rear-mounted component 30 may include an elastic metal wire 31 and metal connectors 32, with the metal connectors 32 respectively sleeved and fixed to both ends of the elastic metal wire 31. At this time, both ends of the rear-mounted component 30 can be connected to one end of the ear hook component 20 (e.g., its receiving compartment 21) via their respective metal connectors 32. The deformation of the first portion 311 of the elastic metal wire 31 inside the metal connector 32 compared to the second portion 312 of the elastic metal wire 31 outside the metal connector 32 can be less than or equal to 10%. Thus, compared to related technologies that first flatten both ends of the elastic metal wire and then injection mold plastic connectors at both ends, this embodiment uses metal connectors 32 instead of plastic connectors, so that the ends of the elastic metal wire 31 do not deform (or deform only slightly), thereby avoiding embrittlement due to deformation at both ends of the elastic metal wire 31 and increasing the reliability of the rear-mounted component 30. In addition, compared to plastic connectors, the metal connectors 32 themselves possess superior structural strength.

[0176] It should be noted that the deformation amount described in this embodiment can be calculated as: |φ1-φ2| / φ2. Where φ1 is the cross-sectional dimension along any direction passing through the geometric center of the cross-section of the first part 311, and φ2 is the cross-sectional dimension along the geometric center of the cross-section of the second part 312 in the same direction as φ1. For example, if the elastic metal wire 31 is a wire and has not deformed, then φ1 and φ2 correspond to the wire diameters of the first part 311 and the second part 312, respectively.

[0177] As an example, the second portion 312 of the elastic metal wire 31 may be curved compared to the first portion 311, so that the rear-mounted assembly 30 can be wrapped around the back of the user's head. Furthermore, the elastic metal wire 31 may be made of spring steel, titanium alloy, titanium-nickel alloy, chromium-molybdenum steel, etc., and the metal connector 32 may be made of titanium alloy (e.g., nickel-titanium alloy, titanium alloy, β-titanium, etc.), steel alloy (e.g., stainless steel, carbon steel, iron, etc.), copper alloy (e.g., copper, brass, bronze, and cupronickel), aluminum alloy, etc.

[0178] In some embodiments, the metal connector 32 may have a mounting hole (not shown in the figure). In this case, the elastic metal wire 31 can be inserted into the mounting hole and connected to the metal connector 32 by welding. Wherein, combined with Figure 26 The end of the elastic metal wire 31 can be further exposed from the outer end face of the metal connector 32, and the welding point between the elastic metal wire 31 and the metal connector 32 can be formed between the exposed part of the elastic metal wire 31 and the outer end face of the metal connector 32. In short, the metal connector 32 is sleeved on the elastic metal wire 31 and the end of the elastic metal wire 31 can be exposed, and then the ends of the two are welded together.

[0179] In some other embodiments, the metal connector 32 is connected to the metal connector 31 by die casting. Compared to the welding connection described above, the die casting connection allows the metal connector 32 to be directly wrapped around the elastic metal wire 31, similar to plastic injection molding.

[0180] Furthermore, regardless of whether the connection is welded or die-cast, to increase the bonding strength between the elastic metal wire 31 and the metal connector 32, the outer surface of the first part 311 may be provided with a knurled structure (not shown in the figure) to increase the contact area between the elastic metal wire 31 and the metal connector 32. The ratio between the depth of the knurled structure and the cross-sectional dimension of the first part 311 can be less than or equal to 15%. Preferably, the ratio between the depth of the knurled structure and the cross-sectional dimension of the first part 311 can be less than or equal to 5%. For example, the depth of the knurled structure is between 0.2 mm and 0.3 mm.

[0181] As an example, combined Figure 26 and Figure 27 The metal connector 32 can be cylindrical and have a mounting surface 321 parallel to its axial direction. The mounting surface 321 can be planar and extend through both ends of the metal connector 32 along the aforementioned axial direction. Since the conductor 33 mentioned later is generally wire with a roughly circular cross-section, the metal connector 32 can be assembled with the conductor 33 via the planar mounting surface 321, facilitating the routing of the rear-mounted assembly 30.

[0182] Furthermore, the metal connector 32 may also have an anti-rotation surface 322 parallel to the mounting surface 321. This prevents relative rotation between the rear hook assembly 30 and the ear hook assembly 20 (e.g., its receiving compartment 21) after the metal connector 32 is inserted into the ear hook assembly 20. The anti-rotation surface 322 extends only through one end of the metal connector 32 near the end of the elastic metal wire 31 along the aforementioned axial direction, allowing one end of the metal connector 32 to form a stop flange 323 connected to the anti-rotation surface 322. Thus, during the insertion and connection of the rear hook assembly 30 to the ear hook assembly 20 (e.g., its receiving compartment 21) via the metal connector 32, the metal connector 32 can be stopped by abutting against the end face of the ear hook assembly 20 through the stop flange 323.

[0183] Furthermore, the other end of the metal connector 32 away from the stop flange 323 may be provided with a stop groove 324. The stop groove 324 may penetrate the mounting surface 321 and the anti-rotation surface 322 along one radial direction of the metal connector 32, and two may be arranged opposite each other along another radial direction of the metal connector 32. In this way, the metal connector 32 and the ear hook assembly 20 (e.g., its receiving compartment 21) can form a snap-fit ​​engagement, thereby preventing the rear hook assembly 30 from separating from the ear hook assembly 20 after assembly.

[0184] As an example, combined Figure 28 and Figure 25 The rear-mount assembly 30 may further include a conductor 33 and an elastic cover 34. The conductor 33 is longer than the elastic wire 31 and extends from one end of the elastic wire 31 to the other. Furthermore, the elastic cover 34 may be made of a softer material (e.g., silicone) and may cover the conductor 33, the elastic wire 31, and the metal connectors 32 at both ends to improve the wearing comfort of the earphone 100.

[0185] In some embodiments, the elastic cover 34 may be provided with a threading channel (not shown in the figure), in which the elastic metal wire 31 and the conductor 33 are threaded. To facilitate threading, the threading channel is sized to allow the elastic metal wire 31 and the conductor 33 to move within it; for example, the cross-sectional area of ​​the threading channel is greater than the sum of the cross-sectional areas of the elastic metal wire 31 and the conductor 33.

[0186] In some other embodiments, the elastic sheath 34 can be injection molded to cover the wire 33 and have a threading channel, through which the elastic metal wire 31 is threaded. Similarly, to facilitate threading, the threading channel is sized to allow the elastic metal wire 31 to move within it; for example, the cross-sectional area of ​​the threading channel is larger than the cross-sectional area of ​​the elastic metal wire 31.

[0187] As an example, combined Figure 25 and Figure 1 The elastic cover 34 may include an integrally connected rear-mounted cover 341 and a compartment cover 342. The rear-mounted cover 341 is used to cover the elastic metal wire 31 and the wire 33, and the compartment cover 342 is used to at least partially cover the compartment 21 after the metal connector 32 is connected to the compartment 21.

[0188] Furthermore, the housing cover 342 can at least partially cover the receiving chamber 21, and may include a first cover 3421 near the metal connector 32 and a second cover 3422 away from the metal connector 32. The first cover 3421 and the second cover 3422 can be bonded and fixed to the receiving chamber 21 respectively, and the bonding strength between the second cover 3422 and the receiving chamber 21 is greater than the bonding strength between the first cover 3421 and the receiving chamber 21. Thus, by utilizing the difference in bonding strength, the relative positions of the housing cover 342 and the receiving chamber 21 can be adjusted during the bonding process to eliminate assembly errors and improve the appearance quality of the earphone 100. Based on this, the first cover 3421 can be fixedly connected to the receiving chamber 21 by a first adhesive (not shown in the figure), and the second cover 3422 can be fixedly connected to the receiving chamber 21 by a second adhesive (not shown in the figure), and the curing speed of the second adhesive is greater than the curing speed of the first adhesive. For example, the first adhesive can be silicone glue or other soft glue, while the second adhesive can be instant adhesive, structural adhesive, PUR adhesive, etc. The second adhesive can be mainly applied in dots to the end of the second covering portion 3422 away from the first covering portion 3421 to serve a pre-fixing function.

[0189] Based on the above description, the containing chamber 21 can be made of plastic, while the elastic covering 34 can be made of silicone. Due to the significant difference in their materials, direct bonding between the two can easily lead to defects such as delamination. Therefore, in conjunction with... Figure 25 The second covering portion 3422 may have a transition connector 3423 injection molded inside, and the bonding strength between the transition connector 3423 and the receiving chamber 21 is greater than the bonding strength between the second covering portion 3422 and the receiving chamber 21, thereby replacing the adhesive bonding between the second covering portion 3422 and the receiving chamber 21. The transition connector 3423 can be a metal part or a plastic part; and when the transition connector 3423 is a plastic part, its material can be the same as that of the receiving chamber 21.

[0190] As an example, combined Figure 25 and Figure 22 For the housing cover 342, the first cover 3421 can be sleeve-shaped, and the second cover 3422 can be strip-shaped. Thus, after the metal connector 32 is connected to the housing 21, when the housing cover 342 covers the housing 21, the first cover 3421 can be sleeved around the main housing 211 and the cover plate 212, while the second cover 3422 covers the cover plate 212 and can further cover the gap between the cover plate 212 and the main housing 211, so as to increase the waterproof performance of the earphone 100.

[0191] Furthermore, combined Figure 25 and Figure 23The second covering portion 3422 may be provided with clearance holes 3424 corresponding to the button holes 2123, so that the central protrusion 2411 of each soft button 241 can be exposed through the clearance holes 3424 and then connected to the hard button 242. The edge connecting portion 2412 of each soft button 241 is located between the main cover 212 and the second covering portion 3422, and the pressing portion 2421 is located on the side of the second covering portion 3422 opposite to the main cover 212. This increases the waterproof performance of the earphone 100.

[0192] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. An earphone, characterized by comprising: The earphone includes a mechanism module, an ear hook assembly, and a back hook assembly. The back hook assembly includes an elastic cover, an elastic metal wire, and metal connectors. The ear hook assembly includes a receiving compartment. The metal connectors are respectively sleeved and fixed to both ends of the elastic metal wire. The deformation of the first part of the elastic metal wire inside the metal connector is less than or equal to 10% compared to the deformation of the second part of the elastic metal wire outside the metal connector. Both ends of the back hook assembly are respectively connected to one end of the receiving compartment through their respective metal connectors. The end of the ear hook assembly facing away from the back hook assembly is connected to the mechanism module. The elastic cover covers the elastic metal wire and at least partially covers the receiving compartment after the metal connectors are connected to the receiving compartment. The metal connector is columnar and has an anti-rotation surface parallel to the axis of the metal connector; the metal connector is provided with a stop flange and / or a stop groove. The stop flange is located at one end of the metal connector away from the elastic metal wire and is connected to the anti-rotation surface; The metal connector has a stop groove at one end near the end of the elastic metal wire, and the stop groove penetrates the anti-rotation surface along a radial direction of the metal connector.

2. The earphone of claim 1, wherein, The deformation is calculated as follows: |φ1-φ2| / φ2; Wherein, φ1 is the cross-sectional dimension along any direction through the geometric center of the cross-section of the first part, and φ2 is the cross-sectional dimension along the geometric center of the cross-section of the second part and in the same direction as φ1.

3. The earphone of claim 1, wherein The metal connector has a mounting hole, the elastic metal wire is inserted into the mounting hole, and connected to the metal connector by welding.

4. The earphone of claim 3, wherein The end of the elastic metal wire is further exposed from the outer end face of the metal connector, and the welding point between the elastic metal wire and the metal connector is formed between the exposed portion of the elastic metal wire and the outer end face of the metal connector.

5. The earphone of claim 1, wherein, The metal connector is connected to the elastic metal wire by die casting.

6. The earphone of claim 1, wherein, The rear-mounted assembly also includes a wire, the length of which is greater than the length of the elastic metal wire, and extends from one end of the elastic metal wire to the other end thereto; The elastic covering body covers the wire by injection molding and has a wire passage. The elastic metal wire passes through the wire passage. The size of the wire passage is set to allow the elastic metal wire to move within the wire passage. Alternatively, the elastic cover may be provided with a threading channel through which the elastic metal wire and the conductor pass, and the threading channel may be sized to allow the elastic metal wire and the conductor to move within the threading channel.

7. The earphone of claim 6, wherein The elastic covering further forms a compartment covering portion, which is used to cover the accommodating compartment, and the accommodating compartment is used to accommodate the battery or the main control circuit board.

8. The earphone of claim 6, wherein, The metal connector has a mounting surface parallel to the axial direction of the metal connector, the mounting surface extending through both ends of the metal connector along the axial direction of the metal connector, and the metal connector is configured to be assembled with the wire through the mounting surface.

9. The earphone according to claim 1, characterized in that, The outer surface of the first part is provided with a knurled structure.

10. The earphone according to claim 9, characterized in that, The ratio between the depth of the knurling structure and the cross-sectional dimension of the first part is less than or equal to 5%.

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