Sound production unit and head-mounted sound production equipment

Abstract

The utility model discloses a sound production unit and a head-mounted sound production device, and relates to the technical field of sound production devices, and the sound production unit comprises a housing assembly, a bone conduction sound production device and an air conduction sound production device. The shell assembly comprises a surface cover, a back cover and a side shell part connected between the surface cover and the back cover, and the side shell part is provided with at least one sound outlet hole; the bone conduction sounding device is arranged in the shell assembly and is connected with the surface cover; the air conduction sound production device is arranged in the shell assembly and connected with the shell assembly, at least part of the air conduction sound production device is embedded in the side shell part, the air conduction sound production device and the sound outlet hole are oppositely arranged, and sound is produced outwards through the sound outlet hole. The air conduction sound production device of the sound production unit is at least partially embedded in the side shell part, so that the occupation of the air conduction sound production device on the internal space of the shell assembly can be reduced, and the miniaturization of the sound production unit is further facilitated.

Description

[0001] This application claims priority to Chinese Patent Application No. 202411044063.7, filed on July 31, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The utility model relates to sound production device technical field, especially a sound production unit and head-mounted sound production equipment. BACKGROUND

[0003] Head-mounted sound production equipment, such as earphones and smart glasses, all include sound production devices that can produce sound. According to the different ways of transmitting sound, sound production devices can be divided into bone conduction sound production devices and air conduction sound production devices.

[0004] Bone conduction sound production devices usually include a coil and a magnetic circuit assembly, which are driven to vibrate by the energized coil. Bone conduction sound production devices are usually connected with a shell (such as the shell of an earphone head), and the vibration is transmitted to the human facial skin through the shell, so that the human can hear the sound.

[0005] Air conduction sound production devices usually include a diaphragm, a coil connected to the diaphragm, and a magnetic circuit assembly that provides a magnetic field. After the coil is energized, the diaphragm is driven to vibrate under the interaction of the magnetic force of the magnetic circuit assembly, thereby stimulating air to produce sound.

[0006] With the development of technology, head-mounted sound production equipment has become more mature and perfect, but there are still some improvements to meet the higher needs of users for head-mounted sound production equipment.

[0007] For example, in traditional earphones, only bone conduction sound production devices or air conduction sound production devices are usually provided, and only bone conduction sound production or air conduction sound production can be achieved, so the sound production method is relatively single. The applicant found that if bone conduction sound production devices and air conduction sound production devices are simultaneously provided in a sound production unit, it is beneficial to improve the sound production effect and expand the sound production method. However, if the arrangement positions of the bone conduction sound production devices and the air conduction sound production devices are unreasonable, it may lead to weak vibration sensation and small sound, resulting in poor listening effect and uncomfortable wearing.

[0008] For another example, the simultaneous provision of bone conduction sound production devices and air conduction sound production devices may result in an excessively heavy or large sound production unit, affecting the comfort of wearing.

[0009] For another example, when bone conduction sound production devices and air conduction sound production devices are simultaneously provided, the magnetic fields leaked from the bone conduction sound production devices and the air conduction sound production devices may adversely affect the work of the other party and external electronic components.

[0010] For another example, the provision of air conduction sound production devices may result in a large sound leakage when the head-mounted sound production equipment is working.

[0011] For example, the bone conduction sound generating device and the air conduction sound generating device each still needs to be improved to increase sensitivity or improve sound quality.

[0012] In summary, there is still room for improvement in sound quality (or listening effect, sound effect), wearing comfort, use reliability and privacy (anti-leakage) of the head-mounted sound generating device.

[0013] The above is only used to help understand the technical solutions of the present application and does not constitute an acknowledgement of the above as prior art. Utility model content

[0014] The utility model discloses a sound generating unit and a head-mounted sound generating device, which are beneficial to miniaturization of the sound generating unit.

[0015] To achieve the above utility model purposes, on one hand, the utility model provides a sound generating unit, comprising:

[0016] The shell assembly comprises a face cover, a back cover and a side shell part connected between the face cover and the back cover, and the side shell part is provided with at least one sound outlet hole;

[0017] The bone conduction sound generating device is arranged in the shell assembly and connected with the face cover; and

[0018] The air conduction sound generating device is arranged in the shell assembly and connected with the shell assembly, and the air conduction sound generating device is at least partially embedded in the side shell part and arranged opposite to the sound outlet hole to generate sound outward through the sound outlet hole.

[0019] On the other hand, the utility model provides a head-mounted sound generating device, comprising the sound generating unit as described above.

[0020] Compared with the prior art, the utility model has the following beneficial effects: according to at least one embodiment of the present application, the sound generating unit simultaneously comprises the bone conduction sound generating device and the air conduction sound generating device, can generate sound by using the bone conduction sound generating device and the air conduction sound generating device, and is beneficial to improving the listening effect. In addition, the air conduction sound generating device is at least partially embedded in the side shell part, which can reduce the occupation of the air conduction sound generating device to the internal space of the shell assembly, and then is beneficial to miniaturization of the sound generating unit, in addition, can improve the firmness of the connection between the air conduction sound generating device and the side shell part, reduce the risk of loosening of the air conduction sound generating device, and ensure the reliability of the sound generating unit. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the head-mounted sound generating device in some embodiments of the utility model.

[0022] Figure 2Is the contact angle diagram of function warehouse side surface and sounding unit of some embodiments of the utility model.

[0023] Figure 3 Is the schematic diagram of sounding unit of some embodiments of the utility model.

[0024] Figure 4 Is the cross-sectional view schematic diagram of sounding unit of some embodiments of the utility model, in the drawing, the shell is integral.

[0025] Figure 5 Is the cross-sectional view schematic diagram of sounding unit of some embodiments of the utility model, in the drawing, the shell is split type.

[0026] Figure 6 Is the structural schematic diagram of sounding unit of some embodiments of the utility model.

[0027] Figure 7 Is Figure 6 The exploded view of sounding unit shown in.

[0028] Figure 8a Is Figure 6 The cross-sectional view schematic diagram of sounding unit shown in.

[0029] Figure 8b Is the structural schematic diagram of sounding unit of some embodiments of the utility model.

[0030] Figure 8c Is the structural schematic diagram of sounding unit of some embodiments of the utility model, in the drawing, the structure of bone conduction magnetic circuit assembly is identical with Figure 17a .

[0031] Figure 9 Is the cross-sectional view schematic diagram of sounding unit of some embodiments of the utility model.

[0032] Figure 10 Is the schematic diagram of sounding unit of some embodiments of the utility model.

[0033] Figure 11 Is the frequency response curve diagram of sounding unit of some embodiments of the utility model with different area sound hole.

[0034] Figure 12 Is the frequency response curve diagram of sounding unit of some embodiments of the utility model with different volume front cavity.

[0035] Figure 13a Is the structural schematic diagram of bone conduction sounding device of some embodiments of the utility model.

[0036] Figure 13b Is Figure 13a The cross-sectional view schematic diagram of bone conduction sounding device shown in.

[0037] Figure 14 is a sectional view of the bone conduction sound generating device of some embodiments of the present application, the structure of the bone conduction magnetic circuit assembly in the figure is consistent with that in Figure 17a .

[0038] Figure 15 is a structural schematic view of the bone conduction sound generating device of some embodiments of the present application, in the figure, the bone conduction support is in a runway shape.

[0039] Figure 16a is a structural schematic view of the bone conduction magnetic circuit assembly of some embodiments of the present application.

[0040] Figure 16b is a structural schematic view of the bone conduction magnetic circuit assembly of some embodiments of the present application. Figure 16a .

[0041] Figure 17a is a structural schematic view of the bone conduction magnetic circuit assembly of some embodiments of the present application.

[0042] Figure 17b is a structural schematic view of the bone conduction magnetic circuit assembly of some embodiments of the present application. Figure 17a .

[0043] Figure 18a is a structural schematic view of the bone conduction magnetic circuit assembly of some embodiments of the present application.

[0044] Figure 18b is a structural schematic view of the bone conduction magnetic circuit assembly of some embodiments of the present application. Figure 18a .

[0045] Figure 19a is a structural schematic view of the bone conduction magnetic circuit assembly of some embodiments of the present application.

[0046] Figure 19b is a structural schematic view of the bone conduction magnetic circuit assembly of some embodiments of the present application. Figure 19a .

[0047] Figure 20 is a structural schematic view of the bone conduction magnetic circuit assembly of some embodiments of the present application. Figure 13b .

[0048] Figure 21a is a sectional view of the bone conduction sound generating device of some embodiments of the present application.

[0049] Figure 21b is a sectional view of the bone conduction sound generating device of some embodiments of the present application, the structure of the bone conduction magnetic circuit assembly in the figure is consistent with that in Figure 17a .

[0050] Figure 22is a structure schematic view of the air guide sound production device of some embodiments of the utility model.

[0051] Figure 23 is Figure 22 is a top view of the air guide sound production device shown in the figure.

[0052] Figure 24 is along Figure 23 is a sectional view along the cutting line M-M in the figure.

[0053] Figure 25 is a top view of the magnetic conductive support of some embodiments of the utility model.

[0054] Figure 26 is a top view of the magnetic conductive support of some embodiments of the utility model.

[0055] Figure 27 is a top view of the magnetic conductive support of some embodiments of the utility model.

[0056] Figure 28 is a structure schematic view of the air guide sound production device of some embodiments of the utility model.

[0057] Figure 29 is Figure 28 is a sectional view of the air guide sound production device shown in the figure.

[0058] Figure 30 is Figure 29 is an enlarged view of the III part in the figure.

[0059] Figure 31 is Figure 28 is a position schematic view of the magnetic conductive support, main magnet and main pole core plate of the air guide sound production device shown in the figure.

[0060] Figure 32 is along Figure 24 is a sectional view along the cutting line J-J in the figure.

[0061] Figure 33 is a position schematic view of the magnetic conductive support, secondary magnet and secondary pole core plate of some embodiments of the utility model.

[0062] Figure 34 is a position schematic view of the magnetic conductive support, secondary magnet and secondary pole core plate of some embodiments of the utility model.

[0063] Figure 35 is a position schematic view of the magnetic conductive support, secondary magnet and secondary pole core plate of some embodiments of the utility model.

[0064] Figure 36 is Figure 24 is a structure schematic view of the air guide magnetic circuit assembly of the air guide sound production device shown in the figure.

[0065] Figure 37 is Figure 24 is an enlarged view of the portion II in

[0066] Figure 38 is Figure 28 is an exploded schematic view of the diaphragm assembly in

[0067] Figure 39 is Figure 22 is a structural schematic view of the diaphragm assembly in

[0068] Figure 40 is Figure 22 is a schematic view of the air guide sound production device provided with double-sided adhesive tape. DETAILED DESCRIPTION

[0069] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are intended to explain, and not to limit, the present application. In addition, it should be noted that only the parts related to the present application are shown in the accompanying drawings for the purpose of description. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0070] The terms "comprising" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to the process, method, product or device.

[0071] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, or to the same alternative embodiment, nor is it necessary that all embodiments include the same feature, structure or characteristic. It will be explicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0072] Reference herein to the area of a hole refers to the size of the area enclosed by the outer contour of the hole.

[0073] Reference herein to "length", "width", "height", "thickness", "wall thickness" and other dimensions or ranges of dimensions, unless otherwise specified, refers to the size or range of sizes of the part with the largest size in the corresponding direction.

[0074] The embodiments of the present specification describe a head-mounted sound emitting device which can be worn on the head of a human body and make the human hear sound, for example, through bone conduction and / or air conduction. The head-mounted sound emitting device includes a sound emitting unit 10 for emitting sound and a wearing mechanism 11 connected to the sound emitting unit 10, the wearing mechanism 11 is used to wear the sound emitting unit 10 on the head of the human body, so that the sound can be conveniently heard by the human, for example, the sound emitting unit 10 is worn to a position corresponding to the ear of the human body, for example, directly into the ear or located in front of the ear.

[0075] In some embodiments, the wearing mechanism 11 can be annular (for example, U-shaped) with an opening, which is sleeved on the top of the head of the user to achieve wearing. In some embodiments, the wearing mechanism 11 can include an ear hook, which is curved and can be hung above the ear of the user. In some embodiments, the wearing mechanism 11 can include a curved back hook and an ear hook suitable for hooking above the ear of the human body, etc., the back hook is suitable for wrapping around the back of the head of the human body. In some embodiments, the wearing mechanism 11 can also be a glasses frame structure, the glasses frame structure includes glasses legs on both sides of the head, and the sound emitting unit 10 can be connected to the glasses legs.

[0076] In some embodiments, the head-mounted sound emitting device includes one sound emitting unit 10, and the sound emitting unit 10 is worn on the left ear or the right ear of the human, for example, when the head-mounted sound emitting device is a single-ear earphone, it only includes one sound emitting unit 10, and can have an ear hook hooked on the ear. In other embodiments, the head-mounted sound emitting device includes two sound emitting units 10, which are respectively worn on the left and right ears of the human, for example, the head-mounted sound emitting device can be a double-ear earphone or glasses, etc., at this time, it includes two sound emitting units, and according to the product, the head-mounted sound emitting device can also include a back hook and an ear hook or a glasses frame structure, etc.

[0077] Hereinafter, the head-mounted sound emitting device is taken as a double-ear earphone as an example for illustration.

[0078] As Figure 1 shown, Figure 1The head-mounted sound production device shown in the figure is a binaural earphone, which includes two sound production units 10 (or earphone heads), a back hanging 110 adapted to be hung around the back of the head, two ear hangings 111 adapted to be hung on the ears, and two functional compartments for accommodating control circuit boards and / or batteries. For example, the two functional compartments are a control compartment 112 for accommodating a control circuit board and a battery compartment 113 for accommodating a battery, respectively. For another example, each functional compartment accommodates a control circuit board and / or a battery. The back hanging 110 is connected between the two functional compartments, and the two sound production units 10 are correspondingly arranged with the two functional compartments. The sound production unit 10 and the corresponding functional compartment are connected through the ear hanging 111. Specifically, the back hanging 110 is connected between the control compartment 112 and the battery compartment 113, and the control compartment 112 and one of the sound production units 10 are connected through one of the ear hangings 111, and the battery compartment 113 and the other sound production unit 10 are connected through the other ear hanging 111. It can be understood that the back hanging 110, the ear hanging 111, and the two functional compartments together constitute a wearing mechanism 11 of the earphone.

[0079] It can be understood that although the present specification takes the binaural earphone as an example for introduction, the head-mounted sound production device is not limited to the binaural earphone, and can also be an electronic device such as a hearing aid, audio glasses, a smart helmet, a VR device, an AR device, etc.

[0080] The head-mounted sound production device as a whole is symmetrical to improve the comfort of wearing. As shown in Figure 1 and Figure 2 The functional compartment has a side surface 1123 facing the human body when the head-mounted sound production device is worn, and the sound production unit 10 has a contact surface 10010 in contact with the human skin when the head-mounted sound production device is worn. The included angle β1 between the side surface 1123 and the contact surface 10010 facing the side where the head is located is obtuse, so that the contact surface 10010 is deflected by a certain angle relative to the side surface 1123 towards the side where the head is located. Optionally, the included angle β1 ranges from 160° to 170°. When the head-mounted sound production device is worn on the head of the human body, the ear hanging 111 and the functional compartment will be outwardly deflected to a certain extent away from the side where the head is located due to the deflection of the contact surface 10010 towards the face, which is beneficial to form a certain gap between the ear hanging 111 and the skin of the head, so as to form a space for placing the legs of glasses, so that the legs of glasses and the ear hanging of the earphone, especially the bent part, do not interfere or interfere less when the user wears glasses, which is more convenient for the user to wear glasses and the earphone at the same time, and enhances the stability of wearing glasses. In addition, the functional compartment can abut against the back of the outer ear, and the sound production unit 10 is deflected towards the side where the head is located, which is closer to the skin of the face, thereby ensuring the stability of wearing the earphone. When the included angle β1 ranges from 160° to 170°, it can also prevent the sound production unit 10 from being difficult to wear or uncomfortable to wear due to excessive deflection.

[0081] Further optionally, the lower end 10010a of the contact surface 10010 is farther away from the side surface 1123 than the upper end 10010b, i.e. the sound emitting unit 10 is deflected upward as a whole, so that the contact surface 10010 is more closely fitted to the skin of the face, which is conducive to improving the sound collecting effect and better ensuring the gap for accommodating the temple.

[0082] It should be noted that when the angle between two surfaces is defined herein, the surface can be a plane or an arc surface. When the surface is a plane, the angle with the surface is the angle with the plane in which the surface lies. When the surface is an arc surface, the most convex point or the most concave point of the arc surface has a tangent plane 10011, and the angle with the surface can be understood as the angle with the tangent plane 10011 of the surface. For example, when the contact surface 10010 and the side surface 1123 are both planes, the angle β1 is the angle between the two planes. When the contact surface 10010 and the side surface 1123 are arc surfaces, the angle β1 is the angle between the tangent plane of the contact surface 10010 and the tangent plane of the side surface 1123. Figure 3

[0083] Next, the sound emitting unit of the head-mounted sound emitting device is exemplified.

[0084] The sound emitting unit 10 comprises a housing assembly 100 and a sound emitting device arranged inside the housing assembly 100. Optionally, the housing assembly 100 is connected by at least two housings. In some embodiments, as shown in FIG. 1, the housing assembly 100 comprises a housing 1000 with one open end and a face cover 1001 sealing the open end of the housing 1000. The housing 1000 is integrally formed, and the face cover 1001 contacts the skin of the face when worn. Optionally, a soft layer (not shown in the figure) is arranged on the outer side of the face cover 1001 to improve the comfort when contacting the face. The material of the soft layer can be, for example, silica gel. It can be understood that the surface of the face cover 1001 for contacting the skin of the face is the contact surface 10010. In other embodiments, as shown in FIG. 2, the housing 1000 is connected by two parts, which comprises a side shell part 1004 and a back cover 1002. The face cover 1001 and the back cover 1002 are oppositely arranged and seal two open ends of the side shell part 1004 respectively. Optionally, the side shell part 1004 is tubular. The side shell part 1004 is not limited to be a single part, for example, it can be connected by two or more parts to be tubular. It can be understood that when the housing 1000 is integrally formed, the back cover 1002 and the side shell part 1004 are integral. The housing 1000 is not limited to have only one opening. In other embodiments, the housing 1000 can also have two or more openings, for example, the side shell part 1004 can have a notch and be sealed by a cover or other components. Figure 4 Figure 5

[0085] ​​​The sound production unit 10 is connected with the ear hook 111 through the shell assembly 100, for example, the ear hook 111 can be connected with the side shell part 1004.

[0086] The sound production device is used to convert electrical signals into mechanical vibrations, for example, the sound production device can be a bone conduction sound production device, which converts electrical signals into mechanical vibrations, and directly transmits the mechanical vibrations to the human skin through the face cover 1001 which is in close contact with the facial skin, so that the human can hear the sound through bone conduction. The sound production device can also be an air conduction sound production device, which excites air vibration through mechanical vibration, thereby forming air conduction sound. It can be understood that the shell assembly 100 is not limited to installing only one or one kind of sound production device.

[0087] In some embodiments, as shown in Figure 4 and Figure 5 The sound production unit 10 can simultaneously realize bone conduction and air conduction, and the bone conduction sound production device 2 and the air conduction sound production device 3 are arranged in the sound production unit 10 at the same time, and the bone conduction sound production device 2 is connected with the face cover 1001 and / or the back cover 1002.

[0088] It can be understood that when the sound production unit 10 has independently arranged bone conduction sound production device 2 and air conduction sound production device 3, the bone conduction sound production device 2 and the air conduction sound production device 3 can be selectively used to produce sound, which increases the diversity of sound production methods, and the respective sound production characteristics of the bone conduction sound production device 2 and the air conduction sound production device 3 can be used to fully play the performance advantages of the combination of bone conduction and air conduction, and avoid the disadvantages, such as filtering out the frequency band with the maximum vibration of the bone conduction vibration part to reduce the tingling feeling, and using the bass of the low frequency part of the air conduction to improve the sensitivity of the low frequency, etc. Of course, the above examples are only one aspect, and those skilled in the art can fully utilize the combination method to diversify the sound quality and improve the shortcomings of the independent use of a single sound production unit, thereby improving the listening effect. Hereinafter, the sound production unit with two sound production devices is taken as an example for introduction. It can be understood that the bone conduction sound production device 2 and the air conduction sound production device 3 described below can also be applied to the sound production unit 10 independently.

[0089] Figure 6 to Figure 8ais a structural schematic diagram of a sound production unit 10 according to some embodiments of the present specification, which comprises a shell assembly 100 and a bone conduction sound production device 2 and an air conduction sound production device 3 both arranged in the shell assembly 100. The bone conduction sound production device 2 is connected with the face cover 1001, and the vibration is transmitted to the human body through the face cover 1001. The air conduction sound production device 3 is arranged on one side of the bone conduction sound production device 2. In other embodiments, the bone conduction sound production device 2 can also be connected with the back cover 1002, and the vibration is transmitted to the face cover 1001 through the shell 1000, and then transmitted to the human body through the face cover 1001. In other embodiments, the bone conduction sound production device 2 can also be connected with the face cover 1001 and the back cover 1002 at the same time. The shell assembly 100 is provided with a sound outlet hole 1003 for communication between the inside and the outside, and the air conduction sound production device 3 produces sound outward through the sound outlet hole 1003, which has a diaphragm 321 for vibration sound production. Optionally, the diaphragm 321 is arranged opposite to the sound outlet hole 1003. Since the bone conduction sound production device 2 and the air conduction sound production device 3 are arranged at the same time, bone conduction sound transmission and air conduction sound transmission can be realized at the same time, the volume is increased, and the respective advantage frequency bands can be utilized to achieve better hearing effect.

[0090] In some embodiments, the air conduction sound production device 3 is located on one side of the bone conduction sound production device 2 in the width direction, and the air conduction sound production device 3 and the bone conduction sound production device 2 are arranged along the width direction Y of the sound production unit 10, so that the arrangement of the air conduction sound production device 3 and the bone conduction sound production device 2 is more reasonable, the structure is more compact, the space is saved, and the weight distribution is optimized, which is beneficial to control the mass and volume of the sound production unit 10 within a smaller range. The sound production unit 10 can have a suitable shape and volume, and will not be too long to cause discomfort when worn, and is beneficial to the air conduction sound production device 3 to produce sound close to the ear, and at the same time, the bone conduction sound production device 2 is located away from the side where the ear is located when the angle β1 between the side surface 1123 and the contact surface 10010 formed towards the side where the head is located is 160°-170°, the part corresponding to the bone conduction sound production device 2 of the shell assembly 100 is deflected towards the face, which can better fit the face, thereby promoting the sound transmission efficiency of the bone conduction sound production device 2. The length direction X, the width direction Y and the thickness (or height) direction Z of the sound production unit 10 can refer to the XYZ coordinate system in Figure 6 , and the thickness direction is perpendicular to the contact surface 10010. It can be understood that the length, width and thickness directions of the shell assembly 100 are consistent with the length, width and thickness directions of the sound production unit 10.

[0091] The air conduction sound generating device 3 and the bone conduction sound generating device 2 are long strips, and the length is greater than the width. For example, the cross section of the air conduction sound generating device 3 and the bone conduction sound generating device 2 is rectangular (the corners can be rounded, right-angled, inverted bevel or other transition connection shape of long side and short side, such as curve, etc.), or track-shaped, etc. It can be understood that the cross section of the air conduction sound generating device 3 and the bone conduction sound generating device 2 is rectangular or track-shaped, which does not mean that the cross section must be strictly rectangular or track-shaped, and it can also be approximately rectangular or track-shaped. Optionally, the bone conduction sound generating device 2 is arranged along the length direction of the sound generating unit 10 (for example, the length direction of the bone conduction sound generating device 2 can be consistent with the projection of the length direction of the sound generating unit 10 on the XY plane, or the two are at an angle of not greater than 30°), so as to increase the volume of the bone conduction sound generating device 2, increase the sound pressure level and reduce the distortion, and improve the sound generating effect. Further optionally, the length direction of the bone conduction sound generating device 2 is consistent with the length direction of the sound generating unit 10. Further optionally, the shell assembly 100 has a substantially rectangular cavity, so that the volume is smaller and the space utilization is higher under the premise of meeting the expected performance. Further optionally, the bone conduction sound generating device 2 and the air conduction sound generating device 3 are cuboid as a whole, and the cross section is substantially rectangular, so as to more fully utilize the space inside the shell assembly 100, make the structure of the entire sound generating unit 10 more compact, and try to reduce the volume of the sound generating unit 10 under the premise of meeting the performance, so that the overall appearance and volume of the earphone head meet the ergonomics, and the bone conduction sound generating device 2 and the air conduction sound generating device 3 are conveniently installed in the earphone head.

[0092] Optionally, the ratio of the length and the width of the bone conduction sound generating device 2 is 1.3-3, which can make the sound generating unit 10 have sufficient vibration transmission area and space in the length direction.

[0093] Optionally, the ratio of the length and the width of the bone conduction sound generating device 2 is 1.3-3, which can make the sound generating unit 10 have sufficient vibration transmission area and space in the length direction.

[0094] It can be understood that when the bone conduction sound generating device 2 and the air conduction sound generating device 3 are arranged in a cuboid or close to a cuboid, a more optimal space utilization effect can be achieved. In other embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can all or one of them be cylindrical. In other embodiments, the bone conduction sound generating device 2 and / or the air conduction sound generating device 3 can also be a multi-prism.

[0095] In the specification, the bone conduction sound generating device 2 and the air conduction sound generating device 3 are taken as examples of a cuboid shape, unless otherwise specified. It can be understood that the bone conduction sound generating device 2 and the air conduction sound generating device 3 are taken as examples of a cuboid shape, and the outer contour of the cross section can also be a runway shape, a cylindrical shape, an elliptical shape, or a polygonal shape.

[0096] In the present application, the classification criteria of each frequency band are as follows: the low frequency band is 20-250Hz, the low-middle frequency is 250-500Hz, the middle frequency band is 500-2000Hz, the middle-high frequency is 2000-5000Hz, and the high frequency band is 5000-20000Hz.

[0097] The frequency response curve of the bone conduction sound generating device 2 and the air conduction sound generating device 3 has a low frequency resonance point (F0), which can be referred to as a low frequency resonance frequency or a low frequency F0 or F0. At the low frequency resonance point, the frequency response curve has a resonance peak.

[0098] Next, the vibration direction and sound hole of the bone conduction sound generating device 2 and the air conduction sound generating device 3 are illustrated.

[0099] As shown in Figure 4 , the positive direction of the vibration direction A of the bone conduction sound generating device 2 points to the contact surface 10010 between the face cover 1001 and the human body. The positive direction of the vibration direction is the direction pointing to the outside of the shell 1000, and the negative direction is the direction pointing to the inside of the shell 1000, which is opposite to the positive direction. Specifically, Figure 4 , the positive direction and the negative direction are indicated by "+" and "-", respectively. The positive direction of the vibration direction A is upward, and the negative direction is downward. The positive direction of the vibration direction B is leftward, and the negative direction is rightward. Optionally, the angle a1 between the vibration direction A and the contact surface 10010 is 60°-90°, further optionally, the angle a1 between the vibration direction A and the contact surface 10010 is 75°-90°, and more further optionally, the angle a1 between the vibration direction A and the contact surface 10010 is 90°. As described above, when the contact surface 10010 is a plane, the angle a1 between a certain object (for example, the vibration direction A) and the contact surface 10010 is the angle between the object and the plane of the contact surface 10010. When the contact surface 10010 is an arc surface, the most convex point or the most concave point of the arc surface has a tangent plane 10011. At this time, the angle a1 between a certain object and the contact surface 10010 can be understood as the angle between the vibration direction A and the tangent plane 10011. By setting the angle a1 to be greater than 60°, the component of the vibration in the direction parallel to the human face can be reduced, so that the vibration of the bone conduction sound generating device 2 is better transmitted to the skull, and the loss of vibration is reduced.

[0100] The positive direction of the vibration direction B of the air conduction sound production device 3 points to the side shell part 1004 of the shell 1000, and the vibration direction B is not parallel or coincident with the vibration direction A of the bone conduction sound production device 2, or in other words, the vibration direction B of the air conduction sound production device 3 has a non-zero angle with the vibration direction A of the bone conduction sound production device 2. In some embodiments, as shown in Figure 8a and Figure 8c , the air conduction sound production device 3 is arranged opposite to the bone conduction sound production device 2 (the side where the diaphragm 321 of the air conduction sound production device 3 is the front side, and the bottom surface 3b is the back side), and at this time, the diaphragm 321 of the air conduction sound production device 3 is close to the sound outlet hole 1003, which is conducive to improving the sound transmission efficiency and increasing the volume. In other embodiments, referring to Figure 8b , the air conduction sound production device 3 is arranged facing the bone conduction sound production device 2, and for example, an opening can be arranged on the bottom surface 3b or other parts of the air conduction sound production device 3, such as a ventilation hole 3c that communicates between the inside and outside of the air conduction sound production device 3, to allow sound to be transmitted out.

[0101] It can be understood that the air conduction sound production device 3 is arranged facing or opposite to the bone conduction sound production device 2, and the thickness direction thereof corresponds to the width direction of the sound production unit 10, so as to reduce the space occupation in the width direction of the sound production unit 10, which is conducive to making the sound production unit 10 not too wide to cause discomfort when worn.

[0102] Referring to Figure 4 and Figure 6 , when the head-mounted sound production device is worn, the side shell part 1004 of the shell 1000 has a proximal end 10040 close to the human ear in the width direction Y thereof. Obviously, the proximal end 10040 of the side shell part 1004 is also the proximal end 10040 of the shell 1000, the shell assembly 100 and the sound production unit 10. The air conduction sound production device 3 is arranged close to the proximal end 10040 relative to the bone conduction sound production device 2, and is arranged to produce sound towards the proximal end 10040 of the side shell part 1004, and the sound outlet hole 1003 is arranged on the proximal end 10040. In this way, the air conduction sound production device 3 can be close to the human ear and produce sound towards the human ear, which is conducive to the directness and clarity of the sound, reduces the loss and distortion of the sound, can make the person hear more air conduction sound, has higher sound production efficiency and better effect, and can appropriately reduce the volume of the air conduction sound production device 3, which is conducive to miniaturization. In addition, the bone conduction sound production device 2 is far away from the sound outlet hole 1003, which can reduce the interference caused by the sound wave inside the bone conduction sound production device 2 when the bone conduction sound production device 2 vibrates. As shown in Figure 1 , the proximal end 10040 is also the end of the side shell part 1004 close to the functional compartment, and the sound outlet hole 1003 is arranged on the end surface of the side shell part 1004 of the shell assembly 100 towards the functional compartment.

[0103] In some embodiments, referring to Figure 9The angle a2 between the vibration direction B of the air conduction sound production device 3 and the contact surface 10010 is 0-45°. The angle a2 between the vibration direction B of the air conduction sound production device 3 and the contact surface 10010 is set to 0-45°, so that the sound emitted by the air conduction sound production device 3 can be better directed to the ear canal, improve the propagation efficiency of the sound, and reduce the leakage of sound. Further, the angle a2 is 0-30°, and further, the angle a2 is 0-15°, so that the sound emitted by the air conduction sound production device 3 can be more accurately directed to the ear canal. When the angle a2 is greater than 0°, the positive direction of the vibration direction B of the air conduction sound production device 3 is directed to the side where the contact surface 10010 is located or the plane where the contact surface 10010 is located, and extends away from the bone conduction sound production device 2. Optionally, when the head-mounted sound production device is worn, the positive direction of the vibration direction B is directed inward of the auricle, so as to improve the sound listening effect by using the sound gathering effect of the auricle, and reduce the leakage of sound.

[0104] It can be understood that the angle between the bone conduction sound production device 2 and the air conduction sound production device 3 can be adjusted in various ways, Figure 9 In the illustrated embodiment, the two are connected to the face cover 1001 and the side shell part 1004 respectively through one connecting piece 12 each. The surface connected to the sound production device of the connecting piece 12 is inclined, so that the bone conduction sound production device 2 and the air conduction sound production device 3 are also inclined after installation. In other embodiments, the connecting piece 12 can not be provided, and inclined surfaces are provided on the face cover 1001 and the side shell part 1004, and the bone conduction sound production device 2 and the air conduction sound production device 3 are respectively installed on the corresponding inclined surfaces to adjust the angle.

[0105] In some embodiments, the angle a3 between the axis direction C of the sound outlet hole 1003 and the contact surface 10010 is 0-45°, so that the sound range emitted thereby can be reliably propagated to the ear. Further, the angle a3 is 0-30°, and further, the angle a3 is 0-15°, so as to further increase the sound propagated to the ear. Optionally, when the angle a3 is greater than 0°, the positive direction of the axis direction C of the sound outlet hole 1003 is directed to the side where the contact surface 10010 is located, so that the sound is propagated to the ear canal under the guidance of the sound outlet hole 1003, and the leakage of sound caused by outward dispersion is reduced. Similarly, the positive direction of the axial direction C of the sound outlet hole 1003 refers to the direction towards the outside of the shell, and the negative direction is opposite to the positive direction. Optionally, when the head-mounted sound production device is worn, the positive direction of the axis direction C is directed inward of the auricle, so as to improve the sound listening effect by using the sound gathering effect of the auricle, and reduce the leakage of sound.

[0106] It can be understood that the angle between the vibration direction or the axis direction (or other) and the contact surface 10010 (or other surface) is 0-N°, which means that the angle can be 0 degrees, that is, parallel to the contact surface 10010, or greater than 0°, that is, inclined to the contact surface 10010, but the inclination angle is not greater than N°, for example, the angle α3 between the axis direction C of the sound outlet hole 1003 and the contact surface 10010 is 0-45°, indicating that the axis direction C can be parallel to the contact surface 10010, or inclined to the contact surface 10010 with an angle not greater than 45°.

[0107] In some embodiments, the axis direction C of the sound outlet hole 1003 coincides with the vibration direction B of the air conduction sound generating device 3, that is, the axis direction C can be parallel to or coincide with the vibration direction B, at this time, the angle between the axis direction C and the vibration direction B and the contact surface 10010 is the same, which can further improve the efficiency of sound propagation. In some embodiments, the axis direction C of the sound outlet hole 1003 is parallel to the contact surface 10010, and the vibration direction B of the air conduction sound generating device 3 is not parallel to the contact surface 10010. In some embodiments, the angle α3 is greater than the angle α2, and the smaller the angle α2, the more perpendicular it is to the depth direction of the shell 1000 and the face cover 1001, which is more conducive to utilizing the space inside the shell assembly 100, preventing the space from becoming larger due to the inclined arrangement of the air conduction sound generating device 3 and the bone conduction sound generating device 2, in addition, the smaller angle α2 can make the center of the diaphragm closer to the sound outlet hole 1003. The sound wave propagation path is shorter, which can improve the sound pressure level received by the human ear, and the air conduction sound generating device 3 can output greater volume under the same power. Therefore, the angle α3 is greater than the angle α2, which is conducive to the miniaturization of the sound generating unit, or in the case of the same volume, increasing the volume of the bone conduction sound generating device 2 and / or the air conduction sound generating device 3, thereby improving the sound generating effect. Optionally, the vibration direction A is perpendicular to the contact surface 10010, and the vibration direction B is parallel to the contact surface 10010, and the air conduction sound generating device 3 adjusts the direction of the sound emitted from the sound outlet hole 1003 through the sound outlet hole 1003.

[0108] It can be understood that the axis direction C of the sound outlet hole 1003 can be adjusted in various ways, for example, Figure 9 In the illustrated embodiment, the sound outlet hole 1003 is inclinedly arranged on the side shell part 1004, and the axis direction C of the sound outlet hole 1003 is changed by the inclination of the side shell part 1004 relative to the contact surface 10010, for example, the side shell part 1004 can be arranged to be inclined relative to the contact surface 10010, and the sound outlet hole 1003 is vertically arranged on the side shell part 1004, and the axis direction C of the sound outlet hole 1003 is changed by the inclination of the side shell part 1004 relative to the contact surface 10010.

[0109] The number of sound holes 1003 can be one or more, for example, one, two, three or more. In some embodiments, the geometric center O1 of the projection of the outer contour of the inner wall of the side shell portion 1004 along the vibration direction B on a plane perpendicular to the vibration direction B coincides with the geometric center O2 of the projection of the diaphragm 321 of the air-guided sound production device 3 along the vibration direction B on the same plane. In other embodiments, referring to Figure 10 , the number of sound holes 1003 is one, and the geometric center O1 of the projection of the outer contour of the inner wall of the side shell portion 1004 along the vibration direction B does not coincide with the geometric center O2 of the projection of the diaphragm 321 of the air-guided sound production device 3 along the vibration direction B, Figure 10 In some embodiments, the outer contour of the diaphragm 321 is shown in dashed line. When the sound hole 1003 is concentric with the diaphragm 321, it can cause the resonance effect to be more pronounced, and the concentricity of the sound hole 1003 and the diaphragm 321 can cause resonance in the acoustic cavity, especially at higher frequencies. This can result in resonance peaks and attenuation valleys at some frequencies, affecting the naturalness and quality of the sound. By setting the sound hole 1003 to be offset relative to the diaphragm 321, for example, at the edge or other position of the diaphragm 321, this situation can be avoided or mitigated, maintaining the normal vibration of the diaphragm 321 and improving the accuracy and clarity of the sound.

[0110] Optionally, the geometric center O1 of the sound hole 1003 is offset relative to the geometric center O2 towards the ear canal, so as to be closer to the ear canal, which is beneficial to improve loudness and reduce sound spreading to the space outside the head, thereby reducing sound leakage. Referring to Figure 10 In some embodiments, the geometric center O1 of the sound hole 1003 is offset relative to the geometric center O2 towards the side closer to the face cover 1001 to be closer to the ear canal. In some embodiments, the geometric center O1 of the sound hole 1003 is offset relative to the geometric center O2 towards the connection 111a between the shell assembly 100 and the ear hook 111, so that the sound hole 1003 is closer to the ear canal. In other embodiments, the geometric center O2 of the diaphragm 321 is offset towards both the face cover 1001 and the connection 111a. Optionally, the distance D8 between the geometric center O2 of the diaphragm 321 and the geometric center O1 of the sound hole 1003 is 0.1-8mm to obtain a better sound production effect and ensure the structural strength of the shell. The distance D8 between the geometric center O2 of the diaphragm 321 and the geometric center O1 of the sound hole 1003 is further optionally 1-4mm to further ensure the effect.

[0111] The number of sound holes 1003 can be one or more, and in some embodiments, the total area of all sound holes 1003 is 10-130mm 2, the total area of the sound hole 1003 is large, which can make the sound emitted by the diaphragm 321 better spread out, and also make the high-frequency cutoff frequency of the air-conduction sound production device 3 move backward, improve the sensitivity of the medium and high frequencies, and when the sound hole 1003 is greater than 130mm 2 , further increasing the area of the sound hole 1003 has little effect on the backward movement of the high-frequency cutoff frequency, and too large sound hole 1003 can easily lead to insufficient shell strength, so the area of the sound hole 1003 can be selected to be 10-130mm 2 . Figure 11 The frequency response curve of the sound production unit with different areas of the sound hole 1003 is shown, and the simulation is performed. The air-conduction sound production device 3 produces sound, and the bone-conduction sound production device 2 does not produce sound. Except for the change in the area of the sound hole 1003, other parameters remain unchanged. As can be seen from the figure, as the area of the sound hole 1003 increases, the high-frequency cutoff frequency also increases, and the frequency band before the high-frequency cutoff frequency is also more flat. The frequency response of the frequency band after the high-frequency cutoff frequency also becomes smaller. Thus, the frequency width of the frequency response curve of the air-conduction part of the entire device is also wider. The frequency width refers to the difference between the frequency value corresponding to the high-frequency cutoff frequency and the frequency value corresponding to the resonance peak at F0. Generally speaking, the wider the frequency width, the better the sound quality, which can effectively improve the sensitivity of the medium and high frequency bands and increase the volume of air conduction. Because the frequency width is wider, the sound details at high frequencies are more delicate, for example, when playing music symphonies or high-fidelity vocal music, the high-pitched parts of violins and pianos are clear and have texture that can be distinguished by the human ear. When singing, the breath and unique voice details are also presented. At the same time, because the sound restoration degree is high and clear, the distortion is also greatly reduced. The overall subjective listening will have a richer and warmer tone, which is very helpful to the overall sound quality. Therefore, setting the area of the sound hole 1003 to 10-130mm 2 , is beneficial to make the air-conduction sound production device 3 have a better frequency response curve and improve the sound production effect. Further, the total area of all sound holes 1003 is 40-100mm 2 , which further ensures the structural strength of the shell while ensuring the sensitivity of the medium and high frequencies.

[0112] Optionally, the number of sound holes 1003 is one, which reduces the obstruction of the solid part between multiple sound holes 1003 to sound waves, so that the sound can be more efficiently transmitted out.

[0113] Optionally, the at least one sound outlet hole 1003 is in a strip shape, and is arranged along a direction parallel to the contact surface 10010 or has an angle of not more than 15° with the parallel direction, which can reduce the sound diffusion to the space outside the head, thereby reducing the sound leakage. Meanwhile, the length direction of the air conduction sound production device 3 is arranged along the length direction X of the sound production unit 10, so that the extension direction of the sound outlet hole 1003 is close to or consistent with the length direction of the diaphragm 321, which is beneficial to the propagation of sound waves. Further optionally, the width W4 of the sound outlet hole 1003 is 0.8-8mm, and the length L11 is 3-15mm. Further optionally, two or more sound outlet holes 1003 are arranged along the length direction of the sound outlet hole 1003, so as to further reduce the sound leakage and improve the sound propagation efficiency.

[0114] In the embodiments described in the specification, the thickness direction of the bone conduction sound production device 2 is consistent with the vibration direction A thereof, and the thickness direction of the air conduction sound production device 3 is consistent with the vibration direction B thereof. In some embodiments, as shown in Figure 8a , the thickness D1 of the bone conduction sound production device 2 is 5mm-6.5mm. In the available space of the earphone head, the thicker the thickness of the bone conduction sound production device 2 is, the larger the volume of the bone conduction magnetic circuit assembly 21 can be, and the larger the magnetic flux B value of the effective magnetic circuit is, and finally the driving force of the magnetic field provided is larger, so as to provide larger vibration amount, i.e. to improve the sensitivity of the bone conduction sound production device 2. Setting the thickness of the bone conduction sound production device 2 to be 5mm-6.5mm is beneficial to obtaining good loudness effect, and will not cause the thickness of the earphone head to be too large. Further, the thickness D1 of the bone conduction sound production device 2 is 5.5mm-6mm, so as to make the size more appropriate.

[0115] The thickness D2 of the air conduction sound production device 3 can be selected to be 1.5mm-3mm. The thickness D2 of the air conduction sound production device 3 refers to the distance between the bottom surface 3b thereof and the outer surface of the middle sheet body 3211 of the diaphragm 321 (see Figure 30 and Figure 37 ) thereof. When the air conduction sound production device 3 includes the reinforcing sheet 3213, refer to Figure 24 and Figure 29The thickness D2 of the air-conduction sound production device 3 refers to the distance between the bottom surface 3b thereof and the outer surface of the reinforcing sheet 3213 thereof. An air-conduction sound production device 3 that is too thin can limit the vibration range of the diaphragm and limit the thickness of the magnetic circuit assembly to an ideal thickness due to the thickness, on the one hand, the magnet in the magnetic circuit assembly is too thin and is not easy to manufacture, for example, the yield is reduced and the cost is increased due to breakage during the manufacturing process, on the other hand, the magnet is too thin and can cause the magnetic flux B value to decrease, ultimately affecting the driving force of the air-conduction sound production device 3, causing the sensitivity to decrease, causing the subjective and objective listening volume of the user to decrease, ultimately affecting the performance and sound quality of the sound, and a too thick component can increase the resonance phenomenon or cause other sound distortion. At the same time, a too thick product can cause the product to have a large volume, which can cause the earphone head to be heavy and the mass to increase, causing the user to feel less comfortable when wearing it. Because the mass increases, the vibration mass of the bone conduction sound production unit system is further increased, which can reduce the sensitivity of the middle and high frequency bands and lack the details of sound transmission, thereby causing the sound quality to decrease. Within the thickness value range described above, the air-conduction sound production device 3 can provide better sound quality, and the length occupied is relatively short, which is conducive to the arrangement of the bone-conduction sound production device 2, so that the overall width of the earphone head is not too large, and the mass of the earphone head is controlled within a reasonable range, which can provide sufficient driving force and also consider the listening quality of the user. Further, the thickness D2 of the air-conduction sound production device 3 is 2mm-2.8mm, so that the size is more appropriate.

[0116] The thickness D1 of the bone-conduction sound production device 2 is greater than the thickness D2 of the air-conduction sound production device 3, and the ratio of the thickness D1 of the bone-conduction sound production device 2 to the thickness D2 of the air-conduction sound production device 3 is 1.7-3. On the one hand, the thickness D1 of the bone-conduction sound production device 2 is greater than the thickness D2 of the air-conduction sound production device 3, which can appropriately increase the volume of the bone-conduction sound production device 2, that is, try to reserve the available space in the earphone head for the bone-conduction sound production device 2, so as to ensure that it has a suitable space to set the bone-conduction magnetic circuit assembly, ensure the thickness and volume of the magnet, further improve the B value of the bone-conduction magnetic circuit assembly, and improve the driving force of the bone-conduction sound production device 2, that is, it can improve the vibration amount to improve the sound pressure level, thereby improving the sound production effect of the sound production unit 10; on the other hand, the air-conduction sound production device 3 is thin, which can reduce the occupation of the internal space of the shell assembly 100, and when it is arranged close to the side shell portion 1004, more space can be left for the installation of the bone-conduction sound production device 2, which is conducive to reducing the volume of the sound production unit 10 or increasing the volume of the bone-conduction sound production device 2.

[0117] Next, the connection structure of the air-conduction sound production device 3 and the shell assembly 100 and the related features of the front cavity are described.

[0118] In some embodiments, the sound production unit 10 further comprises a front cavity 10042 and a rear cavity 10044, which are separated by the diaphragm 321 of the air conduction sound production device 3, i.e., the side of the diaphragm 321 facing the outside of the shell assembly 100 is the front cavity, and the side of the diaphragm 321 facing the inside of the shell assembly 100 is the rear cavity. The front cavity 10042 is in communication with the sound hole 1003 to produce sound outward. By providing the front cavity 10042, it is beneficial to concentrate the sound produced by the vibration of the diaphragm 321 to be emitted through the front cavity 10042 and the sound hole 1003, thereby improving the sound transmission efficiency and reducing the volume loss, and thereby a smaller volume air conduction sound production device 3 can be used, which is beneficial to the miniaturization of the sound production unit 10. At the same time, it is beneficial to improve the high-frequency sensitivity. It can be understood that the inside and outside of the air conduction sound production device 3 are in communication to enable smooth airflow and balance the internal and external air pressure of the air conduction sound production device 3. Optionally, the air conduction sound production device 3 is provided with at least one air hole 3c in communication with the inside and outside thereof, for example, the air hole 3c can be provided on the magnetic conductive bottom plate 3100 and / or the magnetic conductive side plate 3101 of the magnetic conductive support 310, Figure 8a The case where the air hole 3c is provided on the magnetic conductive bottom plate 3100 is shown. In some cases, sound can be emitted outward through the air hole 3c, for example, referring to Figure 8b When the bottom surface 3b of the air conduction sound production device 3 is arranged towards the sound hole 1003, sound can be emitted outward through the air hole 3c.

[0119] Optionally, the outer contour of the air conduction sound production device 3 in a section perpendicular to the vibration direction B is substantially rectangular, and the outer contour of the front cavity 10042 in a section perpendicular to the vibration direction B is also substantially rectangular, so as to make full use of the internal space of the shell 1000, make the size of the air conduction sound production device 3 in a section perpendicular to the vibration direction B larger, and thereby make the air conduction sound production device 3 be able to increase in volume without increasing in thickness too much, ensure sound production effect, and also make the diaphragm 321 have a larger area, thereby being beneficial to increasing the volume and strengthening the low-frequency effect.

[0120] Figure 12 The frequency response curve of the sound production unit 10 corresponding to different volumes of the front cavity obtained by simulation is shown. In the simulation, the air conduction sound production device 3 produces sound, the bone conduction sound production device 2 does not produce sound, and other parameters remain unchanged except for the volume of the front cavity 10042. As can be seen from the figure, as the volume of the front cavity decreases, the high-frequency cutoff frequency becomes larger, the curve between the high-frequency resonance peak and the low-frequency resonance peak is flatter, and the sound pressure level after the high-frequency resonance peak decays less. The volume of the front cavity 10042 refers to the volume of the space enclosed between the diaphragm assembly 32 and the sound hole 1003. Optionally, the volume of the front cavity 10042 is 10-250mm 3, the smaller front cavity 10042 helps to extend the resonance frequency of the front cavity to high frequency, prevent the high frequency cut-off frequency too early, resulting in low high frequency sensitivity, thereby improving the sound effect, but the front cavity 10042 is too small will affect the normal work of the diaphragm 321, for example, it may cause the diaphragm 321 to contact the shell to produce noise. In order to make the front cavity 10042 provide sufficient vibration space for the diaphragm 321, while ensuring that the high frequency cut-off frequency is later, the volume of the front cavity 10042 can be further selected as 50-200mm 3 , and further selected as 70-180mm 3 , so that the volume of the front cavity 10042 is more appropriate, does not occupy too much space, and is also beneficial to ensure the structural strength of the shell.

[0121] In some embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 are located in the same cavity of the shell assembly 100, which can on the one hand make the shell assembly 100 have a larger rear cavity 10044, reduce the F0 of the air conduction sound generating device 3, and improve the low frequency effect, and on the other hand, can effectively utilize the internal space of the shell assembly 100, and reasonably arrange the space arrangement of the two sound generating devices in the earphone head. Compared with separating the two bone conduction sound generating devices 2 and the air conduction sound generating device 3 by a partition, it is beneficial to make the entire earphone head smaller and more compact, and because the volume of the earphone head is reduced, the volume of the shell is also reduced, which can reduce the weight of the entire earphone head, reduce the weight feeling when wearing, and the reduction of the weight is also beneficial to improve the frequency response of the high frequency band of the bone conduction sound transmission part and improve the sound quality of the high frequency band. In some embodiments, referring to Figure 8a , the shell 1000 is provided with a through hole 10000 communicating between the inside and the outside, for example, one or more (in this specification, multiple includes two and more) through holes 10000 can be provided on the back cover 1002 and / or the side shell part 1004, the through hole 10000 communicates with the rear cavity 10044, which is beneficial to increase the rear cavity 10044 of the air conduction sound generating device 3, thereby reducing the F0 and improving the low frequency sensitivity. In other embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be arranged in two independent cavities, for example, separated by a partition, to reduce the mutual interference of work. Optionally, the cavity of the air conduction sound generating device 3 is provided with a through hole 10000 communicating with the outside, the parameters of the through hole 10000 can be referred to the above, or the cavity of the bone conduction sound generating device 2 is provided with a through hole 10000, and the partition is provided with a hole communicating the two cavities.

[0122] The air conduction sound generating device 3 is fixedly connected with the shell assembly 100, and in some embodiments, the air conduction sound generating device 3 is connected with the inner wall of the side shell part 1004, for example, through the diaphragm 321, the air conduction support 30, the magnetically conductive side plate 3101 and / or the magnetically conductive bottom plate 3100 (see Figure 24 and Figure 29) etc. are connected to the inner wall. In other embodiments, in order to further reduce the occupation of the air-conduction sound production device 3 to the internal space of the shell assembly 100, the air-conduction sound production device 3 can be embedded in the side shell part 1004 to reduce the occupation of the air-conduction sound production device 3 to the internal space of the shell assembly 100, thereby facilitating the miniaturization of the sound production unit 10, and in addition, the firmness of the connection between the air-conduction sound production device 3 and the side shell part 1004 can be improved. The air-conduction sound production device 3 is at least partially embedded in the side shell part 1004, for example, referring to Figure 6 and Figure 7 , the inner wall of the side shell part 1004 is provided with a mounting groove 10041, and the air-conduction sound production device 3 is arranged in the mounting groove 10041. In the illustrated embodiment, the air-conduction sound production device 3 is partially located in the mounting groove 10041, and in other embodiments, the air-conduction sound production device 3 can also be completely located in the mounting groove 10041. The mounting groove 10041 not only saves the space occupied by the air-conduction sound production device 3, but also serves to position the air-conduction sound production device 3. Compared with the scheme of attaching it to the inner wall of the side shell part 1004, there is no need to additionally provide a limiting structure, and further, the mounting groove 10041 makes the contact area between the air-conduction sound production device 3 and the shell assembly 100 relatively larger, and can also increase the firmness of the installation of the air-conduction sound production device 3. Optionally, the depth D14 of the mounting groove 10041 is 0.3-1.5mm, and the air-conduction sound production device 3 has sufficient embedding depth, thereby increasing the reliability of positioning and connection, and at the same time, the wall thickness of the part of the side shell part 1004 for mounting the air-conduction sound production device 3 is not too thick, which is beneficial to reducing the mass of the sound production unit 10.

[0123] Optionally, the face cover 1001 is connected to the end surface 1000a of the shell 1000, one side of the mounting groove 10041 extends to the end surface 1000a and has an opening facing the end surface 1000a, i.e., the mounting groove 10041 is communicated to the end surface 1000a, so that the air-conduction sound production device 3 can be directly installed downward from the end surface 1000a, which is more convenient for installation, and the space in the thickness direction of the sound production unit 10 can be more fully utilized, which is beneficial to increasing the volume of the air-conduction sound production device 3 and the effective radiation area of the diaphragm 321, or reducing the volume of the sound production unit 10. Figure 7 In the illustrated embodiment, the mounting groove 10041 is not communicated to the back cover 1002, and the other side of the mounting groove 10041 is spaced from the back cover 1002. Further optionally, in other embodiments, the mounting groove 10041 is communicated to the back cover 1002, i.e., the other side of the mounting groove 10041 extends to the inner surface of the back cover 1002, to further improve the space utilization and increase the size of the air-conduction sound production device 3 available in the thickness direction of the sound production unit 10.

[0124] The air conduction sound production device 3 can be connected to the inner wall of the mounting groove 10041 and / or the back cover 1002 and / or the face cover 1001 by gluing. When the air conduction sound production device 3 is connected to two or all of the mounting groove 10041, the back cover 1002 and the face cover 1001, the connection can be further ensured to be firm, and the reliability of the air conduction sound production device 3 can be ensured. Alternatively, the air conduction sound production device 3 and the groove bottom surface 10043 of the mounting groove 10041 can be connected by gluing, for example, by double-sided adhesive tape or glue, and the like. For example, referring to Figure 8a , the outer edge (for example, the outer ring piece 3210 mentioned below) of the diaphragm 321 of the air conduction sound production device 3 is glued to the groove bottom surface 10043. In other embodiments, the air conduction sound production device 3 further includes a gland 33 connected to the diaphragm 321, and the gland 33 can be glued to the groove bottom surface 10043. In other embodiments, the air conduction sound production device 3 can be glued to the groove bottom surface 10043 through the magnetic bottom plate 3100 thereof. The air conduction sound production device 3 can also be glued to the side wall of the mounting groove 10041 and the face cover 1001 by glue, so as to improve the firmness of the connection. Alternatively, when the air conduction sound production device 3 is installed in the mounting groove 10041, it is flush with the end surface 1000a of the shell 1000 facing the face cover 1001, so as to facilitate the installation and gluing of the face cover 1001. Alternatively, the air conduction sound production device 3 can also be glued to the back cover 1002. In some embodiments, a cavity can also be provided on the face cover 1001, and the air conduction sound production device 3 extends beyond the end surface 1000a into the cavity, so as to increase the volume of the air conduction sound production device 3 and improve the space utilization.

[0125] Referring to Figure 7 and Figure 8a , the side shell part 1004 of the shell 1000 is provided with the front cavity 10042, which communicates the mounting groove 10041 and the sound hole 1003. The front cavity 10042 is provided corresponding to the sound emitting surface (i.e., the diaphragm 321) of the air conduction sound production device 3, and extends from the groove bottom surface 10043 of the mounting groove 10041 to the sound hole 1003. It can be understood that the mounting groove 10041 is not necessary, for example, the mounting groove 10041 can not be provided, and the front cavity 10042 can be directly provided on the inner wall of the side shell part 1004 and communicate with the sound hole 1003, and the air conduction sound production device 3 can also be directly connected to the inner wall of the side shell part 1004.

[0126] Next, the bone conduction sound production device 2 of the sound production unit 10 will be described by way of example.

[0127] First of all, it should be noted that the bone conduction sound generating device 2 and the air conduction sound generating device 3 include similar components, such as a support, a magnetic circuit assembly, a coil, and the like. In order to facilitate distinction, the corresponding components of the bone conduction sound generating device 2 and the air conduction sound generating device 3 are respectively referred to as bone conduction components or air conduction components, for example, the support, the magnetic circuit assembly, and the coil of the bone conduction sound generating device 2 are respectively referred to as a bone conduction support, a bone conduction magnetic circuit assembly, and a bone conduction coil, and the support, the magnetic circuit assembly, and the coil of the air conduction sound generating device 3 are respectively referred to as an air conduction support, an air conduction magnetic circuit assembly, and an air conduction coil.

[0128] Figure 13a is a structural schematic diagram of the bone conduction sound generating device 2 according to some embodiments of the present specification, Figure 13b is Figure 13a is a cross-sectional schematic diagram of the bone conduction sound generating device 2 shown in Figure 14 is a cross-sectional schematic diagram of the bone conduction sound generating device 2 according to some other embodiments. The bone conduction sound generating device 2 includes a bone conduction support 20, a bone conduction magnetic circuit assembly 21, at least one bone conduction coil 22, and at least one elastic sheet 23. The bone conduction magnetic circuit assembly 21 and the bone conduction coil 22 are both arranged inside the bone conduction support 20, and the elastic sheet 23 is connected between the bone conduction support 20 and the bone conduction magnetic circuit assembly 21. Optionally, the elastic sheet 23 is connected to an end face 202 of the bone conduction support 20. The bone conduction coil 22 is arranged around the outside of the bone conduction magnetic circuit assembly 21 and is fixed relative to the bone conduction support 20, and is used to drive the bone conduction magnetic circuit assembly 21 to vibrate. The bone conduction magnetic circuit assembly 21 is connected to the bone conduction support 20 through the elastic sheet 23 and can be reset through the elastic force of the elastic sheet 23. The bone conduction sound generating device 2 is connected to the face cover 1001 to transmit vibration to the face cover 1001, for example, through the bone conduction support 20, the elastic sheet 23, or the connecting member 12, and the like. In the present specification, the stator of the bone conduction sound generating device 2 refers to the part that does not move relative to the housing assembly 100 when the bone conduction sound generating device 2 is working, including components such as the bone conduction support 20 and the bone conduction coil 22, and the vibrator of the bone conduction sound generating device 2 refers to the part that moves relative to the bone conduction support 20 when the bone conduction sound generating device 2 is working, including components such as the bone conduction magnetic circuit assembly 21 and the elastic sheet 23.

[0129] In some embodiments, the bone conduction support 20 is annular, both ends of which are open and arranged around the outside of the bone conduction magnetic circuit assembly 21 and the bone conduction coil 22. Optionally, the shape of the bone conduction support 20 is a rectangular ring (the four corners can be rounded, right-angled, bevelled, or other curved shapes that reduce the volume of the four corner parts, etc.), which is more convenient for cooperation and installation with the air conduction sound generating device 3 in the housing assembly 100 and makes more full use of the space in the housing assembly 100. It can be understood that in other embodiments, the shape of the bone conduction support 20 can also be other shapes, for example, a circular ring, a racetrack, and the like, Figure 15 that is, a schematic diagram of the bone conduction sound generating device 2 when the bone conduction support 20 is in the shape of a racetrack is shown.

[0130] In some embodiments, the bone conduction magnetic circuit assembly 21 comprises at least one magnet 210 and at least two magnetic conductive plates 211, and one magnet 210 is connected between two adjacent magnetic conductive plates 211. The N and S poles of the magnet 210 and the magnet 210 and the magnetic conductive plates 211 are arranged along the vibration direction A of the bone conduction magnetic circuit assembly 21, and when the number of magnets 210 is greater than or equal to two, the polarities of the opposite poles of the two adjacent magnets 210 are the same (i.e. opposite poles attract each other). The bone conduction magnetic gap 24 is formed between the bone conduction magnetic circuit assembly 21 and the bone conduction bracket 20, the outer part of the magnetic conductive plate 211 is surrounded by the bone conduction coil 22, and the bone conduction coil 22 is located in the bone conduction magnetic gap 24 between the bone conduction bracket 20 and the bone conduction magnetic circuit assembly 21. When the bone conduction coil 22 is connected to alternating current, it drives the bone conduction magnetic circuit assembly 21 to reciprocate, and the vibration is transmitted to the bone conduction bracket 20 and the face cover 1001 through the elastic sheet 23. At least one or all of the magnetic conductive plates 211 are surrounded by the bone conduction coil 22, and when all of the magnetic conductive plates 211 are surrounded by the bone conduction coil 22, the number of bone conduction coils 22 corresponds to the number of magnetic conductive plates 211. Alternatively, at least two magnetic conductive plates 211 are surrounded by one bone conduction coil 22 to increase the driving force of the bone conduction coil 22 and improve the volume. In other embodiments, only one magnetic conductive plate 211 can be surrounded by one bone conduction coil 22.

[0131] Figure 13b , Figure 16a , Figure 17a , Figure 18a , Figure 19a , Figure 21a and Figure 21b shows a structural schematic diagram of the bone conduction magnetic circuit assembly 21 according to some embodiments of the present specification.

[0132] Figure 13b , Figure 16a and Figure 21a In the embodiment shown, the bone conduction magnetic circuit assembly 21 comprises one magnet 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and the two magnetic conductive plates 211 are connected to the two sides of the magnet 210. The outer part of each of the two magnetic conductive plates 211 is surrounded by one bone conduction coil 22. Figure 13b , Figure 16a and Figure 21a The difference between the structures shown is that, Figure 13b the magnetic conductive plate 211 shown is provided with a boss 2113 and a recess 2114, Figure 16a the magnetic conductive plate 211 shown is provided with a boss 2113 and is not provided with a recess 2114, Figure 21a and Figure 21b a gasket 26 is connected to the magnetic conductive plate 211, Figure 21a and Figure 21b The difference between the two is the structure of the bone conduction magnetic circuit assembly 21.

[0133] Figure 17a In the illustrated embodiment, the bone conduction magnetic circuit assembly 21 includes three magnets 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and one magnetic conductive plate 211 is connected between two adjacent magnets 210. The two adjacent magnets 210 are arranged with the same polarity. The outer part of the magnetic conductive plate 211 between the two adjacent magnets 210 is surrounded by the bone conduction coil 22. Compared with the single magnet structure, the three-magnet structure can increase the sensitivity.

[0134] Figure 18a In the illustrated embodiment, the bone conduction magnetic circuit assembly 21 includes three magnets 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and one magnetic conductive plate 211 is connected between two adjacent magnets 210. The two adjacent magnets 210 are arranged with the same polarity. The outer part of the magnetic conductive plate 211 between the two adjacent magnets 210 is surrounded by the bone conduction coil 22. Compared with the single magnet structure, the three-magnet structure can increase the sensitivity.

[0135] Figure 19a In the illustrated embodiment, the bone conduction magnetic circuit assembly 21 includes three magnets 210 and two magnetic conductive plates 211 arranged along the vibration direction A, and one magnetic conductive plate 211 is connected between two adjacent magnets 210. The two adjacent magnets 210 are arranged with the same polarity. The outer part of the magnetic conductive plate 211 between the two adjacent magnets 210 is surrounded by the bone conduction coil 22. Compared with the single magnet structure, the three-magnet structure can increase the sensitivity.

[0136] It can be understood that in other embodiments, the bone conduction magnetic circuit assembly 21 can also include two magnets 210 and one magnetic conductive plate 211 arranged along the vibration direction A, and the two magnets 210 are respectively connected to the two sides of the magnetic conductive plate 211, and one bone conduction coil 22 is arranged outside the magnetic conductive plate 211.

[0137] The above-mentioned bone conduction magnetic circuit assembly 21 can be installed in the bone conduction sound generating device 2 and assembled into the sound generating unit 10, for example, Figure 14 and Figure 8c that is, respectively shows the application of the bone conduction magnetic circuit assembly 21 to the bone conduction sound generating device 2 and the sound generating unit 10. Figure 17a The bone conduction magnetic circuit assembly 21 shown is applied to the bone conduction sound generating device 2 and the sound generating unit 10.

[0138] The number of elastic sheets 23 can be one, two or more. In some embodiments, as shown in the figure, Figure 13a and Figure 13bAs shown, the bone conduction sound device 2 includes two elastic sheets 23, which are arranged at intervals along the vibration direction A. Optionally, the two elastic sheets 23 are arranged at the two ends of the bone conduction magnetic circuit assembly 21 along the vibration direction A, which can improve the stability of vibration and help prevent the bone conduction magnetic circuit assembly 21 from swinging (or rolling) during vibration, thereby reducing the risk of impacting the side components. The elastic sheet 23 is in the shape of a sheet as a whole, and the thickness B2 thereof is 0.1 mm to 0.25 mm, and further optionally 0.13 mm to 0.2 mm. Referring to Figure 20 , the elastic sheet 23 includes an outer frame 230, an inner frame 231 located inside the outer frame 230, and at least two elastic arms 232 connected between the outer frame 230 and the inner frame 231. The outer frame 230 is connected to the bone conduction support 20, and optionally, the elastic sheet 23 is attached to the end face 202 of the bone conduction support 20. The outer frame 230 and the bone conduction support 20 can be connected by means of gluing or welding, etc. For example, the outer frame 230 and the end face 202 are connected by welding, which has a better bonding strength than gluing, so that the elastic coefficient of the elastic sheet 23 is more stable, which is conducive to the stability of the low frequency F0 of the bone conduction sound device 2. The welding method can be spot welding or line welding, preferably line welding, which can reduce welding slag, thereby preventing the welding slag from entering the product and generating noise, and the welding strength is stronger than spot welding or gluing, which is conducive to enhancing the reliability.

[0139] It can be understood that the bone conduction magnetic circuit assembly 21 can be connected by multiple parts (split type), and when the structure can be realized, it can also be formed by one-piece magnetization. When connected by multiple parts, the magnet 210 and the magnetic conducting plate 211 are independent parts, and each independent part is connected to form the bone conduction magnetic circuit assembly 21 by gluing or other means. When the bone conduction magnetic circuit assembly 21 is made by one-piece magnetization, the bone conduction magnetic circuit assembly 21 is a single part (one-piece), and the magnet 210 and the magnetic conducting plate 211 are part of the part, without the need for connection process to form the bone conduction magnetic circuit assembly 21, therefore, the bone conduction magnetic circuit assembly 21 formed by one-piece magnetization generally has higher dimensional accuracy. It should be noted that the bone conduction magnetic circuit assembly 21 is one-piece, which means that at least the whole of the magnet 210 and the magnetic conducting plate 211 is a one-piece single part, and the spacer for connecting the bone conduction magnetic circuit assembly 21 and the elastic sheet 23 can be an independent part or one-piece. For example, Figure 16b 、 Figure 17b 、 Figure 18b and Figure 19b respectively show the connection of the elastic sheet 23 and the bone conduction magnetic circuit assembly 21 by means of Figure 16a 、 Figure 17a 、 Figure 18a and Figure 19aThe schematic diagram of the integrated bone conduction magnetic circuit assembly corresponding to the split bone conduction magnetic circuit assembly shown in the figure, in which the boundary between the two independent parts is shown in solid lines, and the boundary between different parts (magnetic plate 211 and magnet 210) in the integrated part is shown in dashed lines, Figure 17b and Figure 19b The spacer (pad 26) in Figure 16b and Figure 18b The spacer (boss 2113) in the bone conduction magnetic circuit assembly is integrated. The integrated magnetization method can refer to the patent document with application number 202111062238.3, the entire contents of which are incorporated herein by reference.

[0140] Next, the air conduction sound production device 3 of the sound production unit 10 will be described.

[0141] In some embodiments, as shown in Figure 22 to Figure 24 , Figure 28 to Figure 31 The air conduction sound production device 3 includes an annular air conduction support 30, and an air conduction magnetic circuit assembly 31 and a diaphragm assembly 32 connected to the air conduction support 30. The air conduction support 30 can be made of lightweight materials such as plastic to reduce the mass and density of the air conduction sound production device 3. Optionally, the air conduction support 30 is non-magnetic. The diaphragm assembly 32 includes an air conduction coil 320 located in the magnetic field of the air conduction magnetic circuit assembly 31 and a diaphragm 321 connected between the air conduction coil 320 and the air conduction support 30. When alternating current is passed through the air conduction coil 320, it will generate an interaction force with the magnetic field of the air conduction magnetic circuit assembly 31, thereby driving the diaphragm 321 to vibrate.

[0142] Next, the air conduction magnetic circuit assembly 31 of the air conduction sound production device 3 will be described first.

[0143] The air conduction magnetic circuit assembly 31 includes at least a magnetic conduction support 310 connected to the bottom of the air conduction support 30, a main magnet 311 disposed on the surface of the magnetic conduction support 310 facing the diaphragm assembly 32, and a main pole core plate 313 connected to the main magnet 311.

[0144] The magnetic conduction support 310 is made of magnetic conduction material and includes a plate-shaped magnetic conduction bottom plate 3100. Optionally, the thickness of the magnetic conduction bottom plate 3100 is 0.3-0.6mm, so that it has good magnetic conduction effect and is beneficial to prevent magnetic leakage. In some embodiments, referring to Figure 24 and Figure 29The magnetic conductive support 310 further comprises a magnetic conductive side plate 3101 protruding from the side edges of the magnetic conductive bottom plate 3100 towards the diaphragm assembly 32, and extending at least partially to be opposite to the main pole core plate 313 with a gap therebetween, thereby forming the air magnetic gap 315. Optionally, the magnetic conductive bottom plate 3100 is in a rectangular shape, and the magnetic conductive side plate 3101 can be arranged at only two opposite side edges of the magnetic conductive bottom plate 3100, or at all four side edges of the magnetic conductive bottom plate 3100, or a magnetic conductive ring 3102 can be arranged on the magnetic conductive bottom plate 3100. Figure 25 to Figure 27 Fig. 4 is a top view of the magnetic conductive support 319 according to some embodiments of the present application, for the purpose of showing the positions and numbers of the magnetic conductive side plates 3101. Figure 25 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the two short edges of the magnetic conductive bottom plate 3100, Figure 26 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the two long edges of the magnetic conductive bottom plate 3100, Figure 27 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the four side edges of the magnetic conductive bottom plate 3100. It can be understood that the magnetic conductive side plates 3101 can be connected to form a ring, and in some embodiments, as shown in Figure 28 to Figure 31 Figure 29 Figure 28 Fig. 5 is a sectional view of the air magnetic sound generation device 2, Figure 30 Figure 29 Fig. 6 is an enlarged view of the III part in Fig. 5, Figure 31 Figure 28 Fig. 7 is a perspective view of the magnetic conductive support 310, the main magnet 311 and the main pole core plate 313 in Fig. 5. The magnetic conductive support 310 comprises a magnetic conductive bottom plate 3100 and a magnetic conductive ring 3102 protruding from the side edges of the magnetic conductive bottom plate 3100 towards the diaphragm assembly 32, and the magnetic conductive ring 3102 is connected by four magnetic conductive side plates 3101. The magnetic conductive ring 3102 surrounds the outside of the main pole core plate 313 to form the air magnetic gap 315, and the air magnetic coil 320 extends into the air magnetic gap 315.

[0145] In some embodiments, reference can be made to Figure 32 Figure 32 Fig. 8 is a sectional view of the air magnetic sound generation device 2 along the line VIII-VIII in Fig. 5, and Figure 24 ​​​​​Fig. 6 is a sectional view of the air-guided magnetic circuit assembly 31 taken along the section line J-J. The air-guided magnetic circuit assembly 31 further comprises a plurality of auxiliary magnets 312 connected to the magnetic bottom plate 3100 to increase the BL value of the air-guided coil 320. The number of the auxiliary magnets 312 can be one or more. Optionally, the number of the auxiliary magnets 312 is even, and the opposite two auxiliary magnets 312 are respectively located on the two sides of the main magnet 311. In some embodiments, the air-guided magnetic circuit assembly 31 further comprises a plurality of auxiliary pole plates 314 connected to the auxiliary magnets 312. Optionally, at least one auxiliary pole plate 314 is connected to the surface of each auxiliary magnet 312 facing the diaphragm assembly 32 to improve the magnetic guiding effect. The auxiliary pole plates 314 and the main pole plate 313 are at least partially opposite to each other, and the air-guided magnetic gap 315 is formed between the auxiliary pole plates 314 and the main pole plate 313. Optionally, the distances between each auxiliary magnet 312 and the main magnet 311 are the same, and further optionally, the distances between each auxiliary pole plate 314 and the main pole plate 313 are the same, so that the air-guided magnetic gap 315 is substantially equal in width, and the magnetic field distribution in the magnetic gap is more uniform. Figure 33 to Figure 35 Fig. 7 is a top view of the air-guided magnetic circuit assembly 31 to show the positions and numbers of the auxiliary pole plates 314 and the auxiliary magnets 312. Figure 33 In the shown embodiment, one auxiliary magnet 312 and one auxiliary pole plate 314 are respectively arranged at the two short sides of the magnetic bottom plate 3100. Figure 34 In the shown embodiment, one auxiliary magnet 312 and one auxiliary pole plate 314 are respectively arranged at the two long sides of the magnetic bottom plate 3100. Figure 35 In the shown embodiment, one auxiliary magnet 312 and one auxiliary pole plate 314 are respectively arranged at the four sides of the magnetic bottom plate 3100. Optionally, the two ends of the auxiliary pole plate 314 in the length direction exceed the two ends of the auxiliary magnet 312 in the length direction to further improve the magnetic guiding effect. The distance L9 by which the auxiliary pole plate 314 exceeds the auxiliary magnet 312 in the length direction can be 0.03-0.2 mm, and optionally, the distances by which the two ends of the auxiliary pole plate 314 exceed the auxiliary magnet 312 in the length direction are the same.

[0146] The magnetic poles of the main magnet 311 are arranged along the vibration direction B of the air-guided sound production device 3, and the magnetic poles of the auxiliary magnet 312 are also arranged along the vibration direction B and opposite to the arrangement direction of the magnetic poles of the main magnet 311. It can be understood that the vibration direction B of the air-guided sound production device 3 is consistent with the vibration direction of the diaphragm 321. The arrangement of the auxiliary magnet 312 can enhance the magnetic field strength and increase the BL value, thereby improving the sensitivity of the air-guided sound production device 3. The auxiliary pole plate 314 can guide the magnetic induction lines, and the cooperation of the auxiliary pole plate 314 and the main pole plate 313 makes the magnetic induction lines of the main magnet 311 and the auxiliary magnet 312 more concentratedly pass through the air-guided coil 320 of the diaphragm assembly 32, thereby improving the driving force and the sensitivity.

[0147] It can be understood that the outer side of the auxiliary magnet 312 can be provided with the magnetic conduction side plate 3101 or not. Optionally, when the auxiliary magnet 312 is provided on one side of the main magnet 311, the side is no longer provided with the magnetic conduction side plate 3101, so as to reduce the mass and the volume. In some embodiments, as shown in Figure 36 Figure 36 Figure 22 The structure diagram of the air guide magnetic circuit assembly 31 of the air guide sound production device 3 is shown. The magnetic conduction bottom plate 3100 is provided with the magnetic conduction side plate 3101 at both short edges, and is not provided with the magnetic conduction side plate 3101 at the long edge. The auxiliary magnet 312 is correspondingly provided at the long edge of the magnetic conduction bottom plate 3100. Optionally, the distance between the magnetic conduction side plate 3101 and the main pole core plate 313 is the same as the distance between the auxiliary pole core plate 314 and the main pole core plate 313, so that the width of the air guide gap 315 around the main magnet 311 is consistent, and the vibration is more balanced.

[0148] Next, the diaphragm assembly 32 of the air guide sound production device 3 is exemplified.

[0149] As shown in Figure 30 , Figure 37 , Figure 38 and Figure 39 , the diaphragm 321 includes an outer ring sheet 3210 connected with the air guide support 30, a middle sheet body 3211 in a flat sheet shape located in the outer ring sheet 3210, and a folded ring part 3212 located between the outer ring sheet 3210 and the middle sheet body 3211, which encloses the area between the outer ring sheet 3210 and the middle sheet body 3211. The outer ring sheet 3210 can be directly or indirectly connected with the air guide support 30, and the two are relatively fixed. The cross section of the folded ring part 3212 is arc-shaped, which can be recessed towards the side where the air guide magnetic circuit assembly 31 is located (see Figure 37 and Figure 39 ), or can be convex in the direction away from the side where the air guide magnetic circuit assembly 31 is located (see Figure 30 and Figure 38 ). Optionally, the outer ring sheet 3210 is connected to the end surface 300 of the air guide support 30, for example, by adhesive connection (such as glue connection or double-sided adhesive connection).

[0150] One end of the air guide coil 320 is connected with the middle sheet body 3211 of the diaphragm 321, and the other end extends into the air guide magnetic gap 315, which surrounds the outside of the main pole core plate 313 and is located inside the magnetic conduction side plate 3101. The main pole core plate 313 and the magnetic conduction side plate 3101 can guide and converge the magnetic induction lines, so that the magnetic induction lines pass through the coil more concentratedly and uniformly, thereby improving the sensitivity and driving force. When the air guide coil 320 is connected with alternating current, it will reciprocate under the interaction with the magnetic field, thereby driving the diaphragm 321 to vibrate, and the diaphragm 321 pushes the air to vibrate and produce sound.

[0151] ​​Optionally, as shown in Figure 30 and Figure 37 The distance L6 between the intermediate sheet 3211 and the main core plate 313 is 0.4-0.8 mm, and the distance L7 between the air guide coil 320 and the magnetic bottom plate 3100 is 0.4-0.8 mm, and both the distance L6 and the distance L7 are greater than the maximum amplitude of the diaphragm 321 when the air guide sound production device 3 is working, which can avoid the collision between the diaphragm 321 and the main core plate 313 and the collision between the air guide coil 320 and the magnetic bottom plate 3100 when the air guide sound production device 3 is working, thereby reducing sound distortion and noise, and prolonging the service life of the air guide sound production device 3. The maximum amplitude refers to the maximum vibration amplitude of the diaphragm 321 on one side in the frequency range of 20 Hz-20 KHz when a 0.5 Vrms voltage is input to the air guide sound production device 3. Optionally, the ratio of the distance L6 and the distance L7 is 0.8-1.2, i.e., the distance L6 and the distance L7 are relatively close, which can reduce the size of the vibration direction B of the air guide sound production device 3 on the one hand, and on the other hand, the distance between the geometric center of the air guide coil 320 and the geometric center of the magnetic plate 313 approaches in the unpowered state, so that the positions of the main magnetic induction line and the air guide coil 320 are more symmetrical, so that the up-down amplitude of the air guide coil 320 after being powered is close, which can reduce distortion, improve sound restoration, and thus improve sound quality. Further optionally, the ratio of the distance L6 and the distance L7 is 0.9-1.1, and more further optionally, the two distances are equal. Optionally, the maximum amplitude of the air guide sound production device 3 is 0.2-0.7 mm, and further optionally 0.3-0.5 mm, if the amplitude is too small, the sensitivity is not enough, if the amplitude is too large, noise is easily generated, if the ratio is too small, the margin is not enough to easily generate noise, and if the ratio is too large, space is wasted. Further optionally, the difference between the distance L6 and the distance L7 and the maximum amplitude of the diaphragm 321 is 0.1-0.3 mm.

[0152] In some embodiments, reference is made to Figure 24 and Figure 38, in order to enhance the strength of the intermediate sheet 3211, improve the sound quality, the diaphragm assembly 32 further comprises a reinforcing sheet 3213 attached to the surface of the intermediate sheet 3211, the material of the reinforcing sheet 3213 can be the same as or different from the material of the diaphragm 321. Optionally, the shape and area of the reinforcing sheet 3213 and the intermediate sheet 3211 are the same, so as to comprehensively reinforce the intermediate sheet 3211. Optionally, the thickness of the reinforcing sheet 3213 is 0.08-0.3mm, and the material of the reinforcing sheet 3213 is a high polymer or a metal or a composite of a high polymer and a metal; the high polymer may, for example, be polyethylene, polypropylene, polyester, polyetherimide, polyethylene terephthalate, carbon fiber composite material or pulp fiber composite material, etc.; the metal may, for example, be aluminum, aluminum alloy, titanium, titanium alloy, aluminum-based material and foamed material, titanium-based material and foamed material, etc. The composite of the high polymer and the metal may, for example, be an aluminum layer in the middle of the carbon fiber composite material. It can be understood that when the reinforcing sheet 3213 is provided, the intermediate sheet 3211 can not be fully enclosed, as shown in Figure 38 , Figure 38 is an exploded view of the diaphragm 321 and the reinforcing sheet 3213 of an embodiment, the intermediate sheet 3211 is provided with an opening 32110, and the reinforcing sheet 3213 is connected to the intermediate sheet 3211 to seal the hole, which can reduce the mass of the diaphragm assembly 32.

[0153] Optionally, the area of the reinforcing sheet 3213 ranges from 30 to 65mm 2 , and the area ratio of the reinforcing sheet 3213 to the diaphragm 321 ranges from 0.35 to 0.65. A large area ratio of the reinforcing sheet 3213 to the diaphragm 321 is beneficial to strengthening the rigidity of the spherical top of the diaphragm 321, which can extend the high-frequency cutoff frequency, but if the ratio is too large, the proportion of the folded ring part 3212 will be reduced, and too small folded ring part 3212 will cause F0 to rise. By setting the area ratio of the reinforcing sheet 3213 to the diaphragm 321 to 0.35-0.65, the high-frequency cutoff frequency can be ensured not to be too forward, and F0 can be kept within the preset range without being too high.

[0154] In some embodiments, referring to Figure 24 and Figure 37 , the air guide sound device 3 further comprises a gland 33, which is annular, connected to the surface of the outer ring sheet 3210, and extends to be oppositely arranged with the folded ring part 3212, thereby protecting the internal folded ring part 3212, and at the same time, the gland 33 is provided with a flat outer end surface 330, which can be connected to the shell assembly 100, for example, by coating glue or providing double-sided adhesive tape 331 on the outer end surface 330, so as to be connected by gluing, Figure 40It is shown that the double-sided adhesive tape 331 is arranged on the outer end surface 330. Optionally, the inner end 334 of the cover 33 (close to the end of the middle sheet 3211) is provided with a recess 332 towards the surface of the diaphragm 321, and the recess 332 is arranged such that the part closer to the inner end 334 of the cover 33 is farther away from the middle sheet 3211 in the vibration direction B, thereby reliably avoiding the vibration of the diaphragm 321. Optionally, referring to Figure 22 and Figure 23 The end surface 300 of the air guide support 30 is provided with a plurality of outward convex columns 301, and the cover 33 is provided with limiting grooves 333 matched with the convex columns 301, and the positioning of the cover 33 is realized by the matching of the limiting grooves 333 and the convex columns 301. Optionally, the convex columns 301 are arranged at the four corners of the air guide support 30, and the limiting grooves 333 are arranged at the four corners of the cover 33.

[0155] It can be understood that in the embodiment in which the air guide sound production device 3 does not include the cover 33, the outer ring sheet 3210 can be connected to the shell 1000, and the diaphragm 321 can be sealed to the front cavity 10042. For example, in the embodiment in which the side shell part 1004 is not provided with the mounting groove 10041, the outer ring sheet 3210 can be connected to the inner wall of the side shell part 1004, and in the embodiment in which the side shell part 1004 is provided with the mounting groove 10041, the outer ring sheet 3210 can be connected to the groove bottom surface 10043. In the embodiment in which the air guide sound production device 3 includes the cover 33, the cover 33 can be connected to the shell 1000, and the air guide sound production device 3 can be sealed to the front cavity 10042. For example, in the embodiment in which the side shell part 1004 is not provided with the mounting groove 10041, the cover 33 can be connected to the inner wall of the side shell part 1004, and in the embodiment in which the side shell part 1004 is provided with the mounting groove 10041, the cover 33 can be connected to the groove bottom surface 10043.

[0156] It should be noted that the embodiments herein can be combined with each other without conflict, thereby obtaining more embodiments.

[0157] The above is only a specific implementation of the present application, and any improvement made on the basis of the concept of the present application is considered as the protection scope of the present application.

Claims

1. A sound emitting unit, characterized by, The application relates to an earphone, which comprises the following parts: a shell assembly (100) comprising a face cover (1001), a back cover (1002) and a side shell part (1004) connected between the face cover (1001) and the back cover (1002), wherein at least one sound outlet hole (1003) is formed in the side shell part (1004); a bone conduction sound generating device (2) arranged in the shell assembly (100) and connected with the face cover (1001); and an air conduction sound generating device (3) arranged in the shell assembly (100) and connected with the shell assembly (100), wherein the air conduction sound generating device (3) is at least partially embedded in the side shell part (1004) and is arranged opposite to the sound outlet hole (1003) to generate sound outwardly through the sound outlet hole (1003).

2. The sound producing unit of claim 1, wherein, An installation groove (10041) is formed in the inner wall of the side shell part (1004), and the air conduction sound generating device (3) is at least partially located in the installation groove (10041).

3. The sound producing unit of claim 2, wherein, The depth of the installation groove (10041) is 0.3-1.5 mm.

4. The sound producing unit of claim 2, wherein, The side shell part (1004) and the back cover (1002) form a shell (1000) with an opening, the face cover (1001) is connected with the end surface (1000a) of the opening end of the shell (1000), one side of the installation groove (10041) extends to the end surface (1000a) of the shell (1000) and has an opening facing the end surface, and the other side of the installation groove (10041) extends to the inner surface of the back cover (1002) or is spaced apart from the inner surface of the back cover (1002).

5. The sound producing unit of claim 2, wherein, The air conduction sound generating device (3) is connected with the inner wall of the installation groove (10041) and / or the back cover (1002) and / or the face cover (1001) by gluing.

6. The sound producing unit of claim 2, wherein, A front cavity (10042) is formed in the groove bottom surface (10043) of the installation groove (10041), the sound outlet hole (1003) is communicated with the front cavity (10042), the volume of the front cavity (10042) is 10-250 cubic millimeters, and the air conduction sound generating device (3) seals the front cavity (10042).

7. The sound producing unit of claim 6, wherein, The total area of all the sound holes (1003) is 10-130 mm 2 .

8. A sound producing unit according to any one of claims 2 to 7, characterized in that The air conduction sound generating device (3) comprises: an air conduction support (30); an air conduction magnetic circuit assembly (31) arranged in the air conduction support (30) and comprising a magnetic conductive bottom plate (3100), a main magnet (311) connected with the magnetic conductive bottom plate (3100) and a main pole core plate (313) connected with the main magnet (311); and a diaphragm assembly (32) comprising a diaphragm (321) connected with the air conduction support (30) and an air conduction coil (320) connected with the diaphragm (321), wherein the air conduction coil (320) is arranged outside the main pole core plate (313).

9. The sound producing unit of claim 8, wherein, The air magnetic circuit assembly (31) further comprises a magnetic side plate (3101) connected with the magnetic bottom plate (3100) and / or a secondary magnetic body (312) connected with the magnetic bottom plate (3100) and a secondary core plate (314) connected with the secondary magnetic body (312), the magnetic side plate (3101) and / or the secondary core plate (314) and the main core plate (313) form an air magnetic gap (315), the air coil (320) is located in the air magnetic gap (315), the magnetic poles of the main magnetic body (311) and the secondary magnetic body (312) are arranged along the vibration direction B of the air sound production device (3), and the arrangement directions of the magnetic poles of the two are opposite.

10. The sound producing unit of claim 8, wherein, The vibrating diaphragm (321) comprises an outer ring sheet (3210) fixed opposite to the air guide support (30), an intermediate sheet body (3211) located in the outer ring sheet (3210), and a folded ring part (3212) located between the outer ring sheet (3210) and the intermediate sheet body (3211), the folded ring part (3212) seals the area between the outer ring sheet (3210) and the intermediate sheet body (3211), the folded ring part (3212) is recessed towards the side where the air magnetic circuit assembly (31) is located or protrudes away from the side where the air magnetic circuit assembly (31) is located, and the air coil (320) is connected with the intermediate sheet body (3211).

11. The sound producing unit of claim 10, wherein, The distance L6 from the intermediate sheet body (3211) to the main core plate (313) is 0.4-0.8 mm, the distance L7 from the air coil (320) to the magnetic bottom plate (3100) is 0.4-0.8 mm, and the distances L6 and L7 are both greater than the maximum amplitude of the vibrating diaphragm assembly (32) when the air sound production device (3) is working.

12. The sound producing unit of claim 11, wherein, The ratio of the distances L6 and L7 is 0.8-1.

2.

13. The sound producing unit of claim 11, wherein, The difference between the distances L6 and L7 and the maximum amplitude of the vibrating diaphragm assembly (32) is 0.1-0.3 mm.

14. The sound producing unit of claim 8, wherein, The thickness D2 of the air sound production device (3) is 1.5-3 mm.

15. The sound producing unit of claim 14, wherein, The thickness D2 of the air sound production device (3) is 2-2.8 mm.

16. The sound producing unit of claim 8, wherein, The thickness of the bone sound production device (2) is greater than the thickness of the air sound production device (3).

17. The sound producing unit of claim 16, wherein, The ratio of the thickness D1 of the bone sound production device (2) and the thickness D2 of the air sound production device (3) is 1.7-3.

18. The sound producing unit of claim 10, wherein, The vibrating diaphragm assembly (32) further comprises a reinforcing sheet (3213) connected with the intermediate sheet body (3211).

19. The sound producing unit of claim 18, wherein, The thickness of the reinforcing sheet (3213) is 0.08-0.3 mm.

20. The sound producing unit of claim 18, wherein, The material of the reinforcing sheet (3213) is a high polymer, a metal, or a composite of a high polymer and a metal. The high polymer is polyethylene, polypropylene, polyester, polyetherimide, polyethylene terephthalate, carbon fiber composite material, or paper pulp fiber composite material. The metal is aluminum, aluminum alloy, titanium, titanium alloy, a composite of aluminum base material and foaming material, or a composite of titanium base material and foaming material.

21. The sound producing unit of claim 10, wherein, The outer ring sheet (3210) is attached to the groove bottom surface (10043) of the mounting groove (10041).

22. The sound producing unit of claim 10, wherein, The air conduction sound production device (3) further comprises a ring-shaped grommet (33) connected to the outer ring sheet (3210), and the grommet (33) is attached to the groove bottom surface (10043) of the mounting groove (10041).

23. The sound producing unit of claim 22, wherein, The grommet (33) extends to be opposite to the folded ring part (3212), and the inner end (334) of the grommet (33) is provided with a recess (332) facing the surface of the diaphragm (321).

24. The sound producing unit of any one of claims 1 to 7, wherein, The positive direction of the vibration direction A of the bone conduction sound production device (2) points to the face cover (1001), and the air conduction sound production device (3) is arranged opposite to the bone conduction sound production device (2).

25. The sound producing unit of claim 16, wherein, The air conduction sound production device (3) is located on one side of the bone conduction sound production device (2) in the width direction, and the air conduction sound production device (3) and the bone conduction sound production device (2) are arranged along the width direction of the sound production unit (10), and the side shell part (1004) has a proximal end (10040) close to the human ear in the width direction when the sound production unit is worn, and the sound outlet hole (1003) is arranged on the proximal end (10040).

26. A head-mounted sound production device, comprising: The sound production unit comprises the sound production unit as claimed in any one of claims 1 to 25.

Images