Sound production unit and head-mounted sound production equipment

Abstract

The utility model discloses a sounding unit and a head-mounted sounding device, and relates to the technical field of sounding devices, the sounding unit comprises a housing assembly, a bone conduction sounding device and an air conduction sounding device, the housing assembly comprises a housing with an opening at one end and a surface cover connected with the opening end of the housing, and the housing is provided with a sounding hole; the bone conduction sound production device and the air conduction sound production device are both arranged in the shell assembly and connected with the shell assembly, and an included angle not equal to 0 is formed between the vibration direction A of the bone conduction sound production device and the vibration direction B of the air conduction sound production device. According to the utility model, the sound production unit realizes the functions of bone conduction sound production and air conduction sound production of one earphone head, improves the diversity of sound production modes, and facilitates the utilization of the sound production characteristics of the bone conduction sound production device and the air conduction sound production device, thereby improving the sound listening effect.

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 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 different sound transmission methods, 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 users' higher demands 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 operation 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, bone conduction sound generating devices and air conduction sound generating devices each still need to be improved to increase sensitivity or to 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 head-mounted sound generating device can utilize the mode of bone conduction and air conduction to sound, improve sound effect.

[0015] To realize the utility model above, one aspect, the utility model provides a sound generating unit, comprising:

[0016] The shell assembly comprises a shell and a face cover connected to the shell, and the shell is provided with a sound outlet hole, and the face cover is used to contact the facial skin.

[0017] The bone conduction sound generating device is arranged in the shell assembly and connected to the shell assembly, and comprises a bone conduction support, a bone conduction magnetic circuit assembly, a spring sheet connected between the bone conduction support and the bone conduction magnetic circuit assembly and a bone conduction coil surrounding the outside of the bone conduction magnetic circuit assembly.

[0018] The air conduction sound generating device is arranged in the shell assembly and connected to the shell assembly, and generates sound outward through the sound outlet hole, and comprises an air conduction support, an air conduction magnetic circuit assembly, a diaphragm assembly connected between the air conduction support and the air conduction magnetic circuit assembly.

[0019] The vibration direction A of the bone conduction sound generating device and the vibration direction B of the air conduction sound generating device have an included angle of 0.

[0020] Another aspect, the utility model provides a head-mounted sound generating device, comprising the sound generating unit as described above and wearing mechanism for wearing the sound generating unit to the human head.

[0021] Compared with the prior art, the utility model has the following beneficial effects: according to at least one embodiment of the utility model, the sound production unit simultaneously includes relatively independent bone conduction sound production device and air conduction sound production device, the bone conduction sound production device can pass through the mode of bone conduction and transmit sound, the air conduction sound production device can utilize the mode of air conduction and emit sound outward through the sound hole, realize that one earphone head can bone conduction sound production and air conduction sound production's function, increase the diversity of sound production mode, and be favorable to utilizing the sound production characteristic that bone conduction sound production device and air conduction sound production device are good at respectively, thereby improve the listening effect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structural schematic diagram of head-mounted sound production equipment of some embodiments in the utility model.

[0023] Figure 2 It is the contact angle schematic diagram of function warehouse side surface and sound production unit of some embodiments in the utility model.

[0024] Figure 3 It is the schematic diagram of sound production unit of some embodiments in the utility model.

[0025] Figure 4 It is the cross-sectional view schematic diagram of sound production unit of some embodiments in the utility model, in the drawing, the shell is integral.

[0026] Figure 5 It is the cross-sectional view schematic diagram of sound production unit of some embodiments in the utility model, in the drawing, the shell is split type.

[0027] Figure 6 It is the cross-sectional view schematic diagram of sound production unit of some embodiments in the utility model, in the drawing, the sound production unit only includes bone conduction sound production device.

[0028] Figure 7 It is the cross-sectional view schematic diagram of sound production unit of some embodiments in the utility model, in the drawing, the sound production unit only includes air conduction sound production device.

[0029] Figure 8 It is the structural schematic diagram of sound production unit of some embodiments in the utility model.

[0030] Figure 9 It is the explosion view of sound production unit shown in Figure 8 .

[0031] Figure 10a It is the cross-sectional view schematic diagram of sound production unit shown in Figure 8 .

[0032] Figure 10b It is the structural schematic diagram of sound production unit of some embodiments in the utility model.

[0033] Figure 10c is a structure diagram of a sound unit of some embodiments of the present application, in which the structure of the bone conduction magnetic circuit assembly is consistent with that shown in Figure 16a .

[0034] Figure 11 is a cross-sectional view of the sound unit of some embodiments of the present application.

[0035] Figure 12a is a structure diagram of a bone conduction sound device of some embodiments of the present application.

[0036] Figure 12b is a cross-sectional view of the bone conduction sound device shown in Figure 12a .

[0037] Figure 13 is a cross-sectional view of the bone conduction sound device of some embodiments of the present application, in which the structure of the bone conduction magnetic circuit assembly is consistent with that shown in Figure 16a .

[0038] Figure 14 is a structure diagram of a bone conduction sound device of some embodiments of the present application, in which the bone conduction support is in the shape of a racetrack.

[0039] Figure 15a is a structure diagram of a bone conduction magnetic circuit assembly of some embodiments of the present application.

[0040] Figure 15b is a schematic view of the bone conduction magnetic circuit assembly shown in Figure 15a when the bone conduction magnetic circuit assembly is a one-piece part.

[0041] Figure 16a is a structure diagram of a bone conduction magnetic circuit assembly of some embodiments of the present application.

[0042] Figure 16b is a schematic view of the bone conduction magnetic circuit assembly shown in Figure 16a when the bone conduction magnetic circuit assembly is a one-piece part.

[0043] Figure 17a is a structure diagram of a bone conduction magnetic circuit assembly of some embodiments of the present application.

[0044] Figure 17b is a schematic view of the bone conduction magnetic circuit assembly shown in Figure 17a when the bone conduction magnetic circuit assembly is a one-piece part.

[0045] Figure 18a is a structure diagram of a bone conduction magnetic circuit assembly of some embodiments of the present application.

[0046] Figure 18b is a schematic view of the bone conduction magnetic circuit assembly shown in Figure 18a when the bone conduction magnetic circuit assembly is a one-piece part.

[0047] Figure 19a is Figure 12b The structure diagram of the bullet shown in the figure.

[0048] Figure 19b is Figure 19a The plan view of the bullet shown in the figure.

[0049] Figure 20a and Figure 20b The bone conduction sound generating device 2 shown in the figure. Figure 19a The simulation diagram of the first order mode and the second order mode of the bone conduction sound generating device 2 shown in the figure.

[0050] Figure 21 The cross-sectional view of the bone conduction sound generating device of some embodiments of the utility model, in the drawing, the structure of the bone conduction magnetic circuit assembly is identical with that in the figure. Figure 16a

[0051] Figure 22 The cross-sectional view of the bone conduction sound generating device of some embodiments of the utility model.

[0052] Figure 23 is Figure 12b The enlarged view of I part in the figure.

[0053] Figure 24a The cross-sectional view of the bone conduction sound generating device of some embodiments of the utility model.

[0054] Figure 24b The cross-sectional view of the bone conduction sound generating device of some embodiments of the utility model, in the drawing, the structure of the bone conduction magnetic circuit assembly is identical with that in the figure. Figure 16a

[0055] Figure 25a The cross-sectional view of the bone conduction sound generating device of some embodiments of the utility model.

[0056] Figure 25b The cross-sectional view of the bone conduction sound generating device of some embodiments of the utility model, in the drawing, the structure of the bone conduction magnetic circuit assembly is identical with that in the figure. Figure 16a

[0057] Figure 26 The structure diagram of the air conduction sound generating device of some embodiments of the utility model.

[0058] Figure 27 is Figure 26 The plan view of the air conduction sound generating device shown in the figure.

[0059] Figure 28 The cross-sectional view along the M-M section line in the figure. Figure 27

[0060] Figure 29 ​​​​is a top view of the magnetic conductive support of some embodiments of the present utility model.

[0061] Figure 30 is a top view of the magnetic conductive support of some embodiments of the present utility model.

[0062] Figure 31 is a top view of the magnetic conductive support of some embodiments of the present utility model.

[0063] Figure 32 is a structural schematic view of the air conduction sound production device of some embodiments of the present utility model.

[0064] Figure 33 is Figure 32 is a sectional view of the air conduction sound production device shown in the figure.

[0065] Figure 34 is Figure 33 is an enlarged view of III part in the figure.

[0066] Figure 35 is Figure 32 is a position schematic view of the magnetic conductive support, main magnet and main pole core plate of the air conduction sound production device shown in the figure.

[0067] Figure 36 is a sectional view along Figure 28 cutting line J-J in the figure.

[0068] Figure 37 is a position schematic view of the magnetic conductive support, secondary magnet and secondary pole core plate of some embodiments of the present utility model.

[0069] Figure 38 is a position schematic view of the magnetic conductive support, secondary magnet and secondary pole core plate of some embodiments of the present utility model.

[0070] Figure 39 is a position schematic view of the magnetic conductive support, secondary magnet and secondary pole core plate of some embodiments of the present utility model.

[0071] Figure 40 is Figure 28 is a structural schematic view of the air conduction magnetic circuit assembly of the air conduction sound production device shown in the figure.

[0072] Figure 41 is Figure 28 is an enlarged view of II part in the figure.

[0073] Figure 42 is Figure 32 is an explosion schematic view of the diaphragm assembly in the figure.

[0074] Figure 43 is Figure 26 is a structural schematic view of the diaphragm assembly in the figure.

[0075] Figure 44 is Figure 26 The schematic view of the air conduction sound production device provided with double-sided adhesive tape is shown. DETAILED DESCRIPTION

[0076] In order to make the above objectives, characteristics and advantages of the present application more apparent, more comprehensible, the specific embodiments of the present application are described in detail below with reference to the drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0077] 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 these processes, methods, products or devices.

[0078] 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 application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0079] The area of the hole referred to herein refers to the size of the area enclosed by the outer contour of the hole.

[0080] The dimensions or size ranges referred to herein, such as "length", "width", "height", "thickness", "wall thickness", etc., refer to the dimensions or size ranges of the largest part in their corresponding directions, unless otherwise specified.

[0081] The embodiments of the present application describe a head-mounted sound production device which can be worn on the head of a human body and enable the human body to hear sound, for example, through bone conduction and / or air conduction. The head-mounted sound production device includes a sound production unit 10 for producing sound and a wearing mechanism 11 connected to the sound production unit 10, the wearing mechanism 11 being used to wear the sound production unit 10 on the head of the human body, so that the sound can be conveniently heard by the human body. For example, the sound production unit 10 is worn at a position corresponding to the ear of the human body, such as directly into the ear or at a position in front of the ear.

[0082] In some embodiments, the wearing mechanism 11 can be in the form of a ring (e.g. a U-shaped ring) with an opening, which is fitted over the top of the head of the user to achieve wearing. In some embodiments, the wearing mechanism 11 can include ear hooks, which are in the form of a curved shape and can be hung over the ears of the user. In some embodiments, the wearing mechanism 11 can include a curved-shaped back hook and an ear hook adapted to be hooked over the ears of the human body, etc. The back hook is adapted to be wrapped around the back of the head of the human body. In some embodiments, the wearing mechanism 11 can also be in the form of a frame structure, which includes legs located on both sides of the head, and the sound generating unit 10 can be connected to the legs.

[0083] In some embodiments, the head-mounted sound generating device includes one sound generating unit 10, which is worn on the left ear or the right ear of the human body. For example, when the head-mounted sound generating device is a single-ear earphone, it only includes one sound generating unit 10, and can further have an ear hook hooked over the ear. In other embodiments, the head-mounted sound generating device includes two sound generating units 10, which are respectively worn on the left ear and the right ear of the human body. For example, the head-mounted sound generating device can be a double-ear earphone or glasses, etc., which includes two sound generating units. Depending on the product, the head-mounted sound generating device can further include a back hook and an ear hook or a frame structure, etc.

[0084] Hereinafter, the head-mounted sound generating device is taken as an example of a double-ear earphone.

[0085] As shown in FIG. 1, Figure 1 As shown in FIG. 1, Figure 1 The head-mounted sound generating device shown in FIG. 1 is a double-ear earphone, which includes two sound generating units 10 (or earphone heads), and further includes a back hook 110 adapted to be wrapped around the back of the head, two ear hooks 111 adapted to be hooked over 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. In another example, each functional compartment accommodates a control circuit board and / or a battery. The back hook 110 is connected between the two functional compartments, and the two sound generating units 10 are respectively arranged corresponding to the two functional compartments. The sound generating unit 10 and the corresponding functional compartment are connected through the ear hook 111. Specifically, the back hook 110 is connected between the control compartment 112 and the battery compartment 113, and the control compartment 112 and one of the sound generating units 10 are connected through one ear hook 111, and the battery compartment 113 and the other sound generating unit 10 are also connected through one ear hook 111. It can be understood that the back hook 110, the ear hook 111 and the two functional compartments together constitute the wearing mechanism 11 of the earphone.

[0086] It can be understood that although the present specification is introduced by taking the dual-ear earphone as an example, the head-mounted sound production device is not limited to the dual-ear earphone, for example, can also be a hearing aid, audio glasses, a smart helmet, a VR device, an AR device, and the like.

[0087] The head-mounted sound production device is symmetrical as a whole to improve the comfort of wearing. As shown in Figure 1 and Figure 2 , the functional bin has a side surface 1123 facing the human body when the head-mounted sound production device is worn, the sound production unit 10 has a contact surface 10010 which is in contact with the skin of the human body when the head-mounted sound production device is worn, and 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 is in the range of 160°-170°. When the head-mounted sound production device is worn on the head of the human body, the ear hook 111 and the functional bin 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 hook 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 hook 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 bin 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 more closely attached to the skin of the face, thereby ensuring the stability of wearing the earphone. When the included angle β1 is in the range of 160°-170°, it can also prevent the earphone from being difficult to wear or uncomfortable to wear due to excessive deflection of the sound production unit 10.

[0088] Further optionally, the lower end 10010a of the contact surface 10010 is farther from the side surface 1123 on the same side of the contact surface 10010 than the upper end 10010b, i.e., the sound production unit 10 is deflected upward as a whole, so that the contact surface 10010 is more closely attached to the skin of the face, which is beneficial to improve the sound transmission effect, and at the same time can better ensure the formation of the gap for accommodating the legs of glasses.

[0089] It should be noted that when the included angle between two surfaces is defined herein, the surface can be a plane or an arc surface. When the surface is a plane, the included angle with the surface is the included angle with the plane where the surface is located. When the surface is an arc surface, reference Figure 3The most convex or concave point of the arc surface has a tangent plane 10011. The angle between the arc surface and the tangent plane 10011 can be understood as the angle between the arc surface and the tangent plane 10011. For example, when both the contact surface 10010 and the side surface 1123 are planes, the angle β1 is the angle between the two planes. When both 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.

[0090] The following section provides an example of the sound-generating unit in a head-mounted audio device.

[0091] The sound-generating unit 10 includes a housing assembly 100 and a sound-generating device disposed inside the housing assembly 100. Optionally, the housing assembly 100 is formed by connecting at least two housings. In some embodiments, such as... Figure 4 As shown, the outer shell assembly 100 includes a shell 1000 with an open end and a face cover 1001 that seals the open end of the shell 1000. The shell 1000 is integrally molded. The face cover 1001 comes into contact with the facial skin when worn. Optionally, a soft layer (not shown) is provided on the outer side of the face cover 1001 to improve comfort when in contact with the face. The material of the soft layer can be, for example, silicone. It is understood that the surface of the face cover 1001 that comes into contact with the facial skin is the contact surface 10010. In other embodiments, such as... Figure 5 As shown, the housing 1000 is formed by connecting two parts, including a side shell 1004 and a back cover 1002. The front cover 1001 and back cover 1002 are disposed opposite each other, each sealing one of the two open ends of the side shell 1004. Optionally, the side shell 1004 is tubular. The side shell 1004 is not limited to a single part; for example, it can be formed by connecting two or more parts into a tubular shape. It is understood that when the housing 1000 is integrally formed, the back cover 1002 and the side shell 1004 are integral. The housing 1000 is not limited to having only one opening; in other embodiments, the housing 1000 may also have two or more openings. For example, the side shell 1004 may have a notch, which is then sealed by a cover or other component.

[0092] The sound-generating unit 10 is connected to the ear hook 111 via its housing assembly 100. For example, the ear hook 111 may be connected to the side shell portion 1004.

[0093] The sound-generating device is used to convert electrical signals into mechanical vibrations. For example, it can be a bone conduction sound generator, which converts electrical signals into mechanical vibrations and transmits these vibrations directly to the skin through a face cover 1001 that fits in contact with the facial skin, allowing the person to hear the sound via bone conduction. The sound-generating device can also be an air conduction sound generator, in which case it uses mechanical vibrations to agitate air, thereby generating air-conducted sound. It is understood that the housing assembly 100 is not limited to installing only one or a single type of sound-generating device.

[0094] In some embodiments, referring to Figure 6 , the sound generating unit 10 is a bone conduction sound generating unit, in which only the bone conduction sound generating device 2 is arranged, and the air conduction sound generating device 3 is not arranged. Optionally, the bone conduction sound generating device 2 is connected to the face cover 1001 and / or the back cover 1002. Figure 7 In some embodiments, referring to Figure 4 and Figure 5 , the sound generating unit 10 is capable of both bone conduction and air conduction, in which both the bone conduction sound generating device 2 and the air conduction sound generating device 3 are arranged. Optionally, the bone conduction sound generating device 2 is connected to the face cover 1001 and / or the back cover 1002.

[0095] It can be understood that when the sound generating unit 10 has independently arranged bone conduction sound generating device 2 and air conduction sound generating device 3, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be selectively used to generate sound, increasing the diversity of sound generating methods, and the respective sound generating characteristics of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be used to fully utilize the performance advantages of the combination of bone conduction and air conduction, and avoid their disadvantages, such as filtering out the frequency band with the maximum vibration of the bone conduction vibration part to reduce the tingling sensation, 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 disadvantages of the independent use of a single sound generating unit, thereby improving the listening effect. Hereinafter, the sound generating unit with two sound generating devices will be taken as an example for introduction. It can be understood that the bone conduction sound generating device 2 and the air conduction sound generating device 3 described below can also be applied to the sound generating unit 10 independently.

[0096] Figure 8 to Figure 10ais 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.

[0097] 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 8 , 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.

[0098] 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 outer contour must be strictly rectangular or track-shaped, and can 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 more 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 achieving the expected performance. Further optionally, the bone conduction sound generating device 2 and the air conduction sound generating device 3 are in the shape of a cuboid as a whole, and the cross section is substantially rectangular, so as to more fully utilize the space inside the shell assembly 100, so that the structure of the entire sound generating unit 10 is more compact, and the volume of the sound generating unit 10 is as small as possible 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.

[0099] Optionally, the ratio of the length and the width of the bone conduction sound generating device 2 is 1.3-3, so that the sound generating unit 10 has sufficient vibration transmission area and space in the length direction, which is beneficial to balance the aspect ratio of the bone conduction sound generating device 2, and ensure good structural stability, vibration transmission efficiency and sound quality while providing good acoustic performance. Further, the ratio of the length and the width of the bone conduction sound generating device 2 is 1.6-2, so as to further balance the aspect ratio and ensure the sound quality and effect of the output sound.

[0100] Optionally, the ratio of the length and the width of the air conduction sound production device 3 is 1.3-3, and the air conduction sound production device 3 is arranged along the length direction of the sound production unit 10 (for example, the length direction of the air conduction sound production device 3 can be consistent with the projection of the length direction of the sound production unit 10 on the XY plane, or the two form an angle of not more than 30°), which is beneficial to fully utilize the space in the length direction of the air conduction sound production device 3, increase the effective radiation area of the diaphragm 321, and at the same time, fully utilize the space while having good structural stability, vibration transmission efficiency and sound quality. Further, the ratio of the length and the width of the air conduction sound production device 3 is 1.6-2, to further balance the aspect ratio and ensure good structure and acoustic output effect. The bone conduction sound production device 2 and the air conduction sound production device 3 are arranged in a long strip shape, and the air conduction sound production device 3 is arranged on one side in the width direction of the bone conduction sound production device 2, which is beneficial to make the structure arrangement more compact, thereby fully utilizing the internal space of the shell assembly 100 and increasing the vibration transmission area of the bone conduction sound production device 2. For example, Figure 8 In the illustrated embodiment, if the bone conduction sound production device 2 is arranged in a cylindrical shape, its volume will be smaller than that when it is arranged in a long strip shape under the condition that the internal space of the shell assembly 100 is unchanged. It can be understood that when the bone conduction sound production device 2 and the air conduction sound production device 3 are arranged in a cuboid shape or close to a cuboid shape, better space utilization effect can be achieved. In other embodiments, the bone conduction sound production device 2 and the air conduction sound production device 3 can all or one of them be arranged in a cylindrical shape. In other embodiments, the bone conduction sound production device 2 and / or the air conduction sound production device 3 can also be a multi-prism shape.

[0101] In this specification, the bone conduction sound production device 2 and the air conduction sound production device 3 are taken as examples of a cuboid shape for introduction, unless otherwise specified. It can be understood that the introduction by taking the cuboid shape as an example does not mean that the bone conduction sound production device 2 and the air conduction sound production device 3 must be in a cuboid shape, and the cross-sectional outline thereof can also be in a runway shape, a cylindrical shape, an elliptical shape or a polygonal shape, etc.

[0102] Next, the sound production methods of the bone conduction sound production device 2 and the air conduction sound production device 3 are exemplified.

[0103] Since the bone conduction sound production device 2 and the air conduction sound production device 3 are arranged at the same time, the acoustic characteristics of the two can be fully utilized, and the advantages of each can be combined and utilized reasonably to achieve better sound production effect. Moreover, compared with pure bone conduction sound and air conduction sound, the sound production method can also be more diversified.

[0104] In some embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 work simultaneously in the whole sound generating frequency band, so that the control circuit of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be simplified, and the electronic components can be reduced, for example, no additional frequency divider circuit is needed, which can reduce the complexity and cost of design and manufacturing. In addition, the whole frequency band sound generating mode can increase the overall loudness, provide a more natural frequency band transition, and avoid the phase difference and frequency response discontinuity caused by frequency division. It should be noted that the sound generating device works in a certain frequency band means that it can normally generate sound in the frequency band, and the gain attenuation is small (for example, within 10 dB), and the sound generating device does not work in a certain frequency band means that it does not generate sound or the sound volume is greatly attenuated (for example, more than 18 dB) in the frequency band.

[0105] In some embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be independently controlled to work, so that in a certain frequency band, the bone conduction sound generating device 2 or the air conduction sound generating device 3 can be selectively used to generate sound, or both of them generate sound at the same time. For example, in a certain frequency band, the bone conduction sound generating device 2 generates sound, and the air conduction sound generating device 3 does not generate sound, or the bone conduction sound generating device 2 does not generate sound, and the air conduction sound generating device 3 generates sound, or the bone conduction sound generating device 2 and the air conduction sound generating device 3 generate sound at the same time. In this way, the respective advantages of the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be fully utilized to improve the overall sound quality of the sound generating unit 10. Moreover, since different signals can be input into the bone conduction sound generating device 2 and the air conduction sound generating device 3, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can also emit different sounds, and the sound generating effect is more diversified.

[0106] In some embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 have respective working frequency bands, and at least part of the working frequency bands are different. It can be understood that the air conduction sound generating device 3 works at least in the frequency band in which the bone conduction sound generating device 2 does not work, so that the whole frequency band sound generating can be realized by the cooperation of the two sound generating devices.

[0107] 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.

[0108] As shown in FIG. 1, 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 4The positive direction and the negative direction are respectively indicated by "+" and "-". 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°. 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 an object (for example, the vibration direction A) and the contact surface 10010 is the angle between the object and the plane on which the contact surface 10010 is located. When the contact surface 10010 is a curved surface, the curved surface has a tangent plane 10011 at the most convex point or the most concave point. At this time, the angle a1 between an 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 generation device 2 is better transmitted to the skull, and the loss of vibration is reduced.

[0109] The positive direction of the vibration direction B of the air conduction sound generation device 3 is directed to the side shell part 1004 of the shell 1000. The vibration direction B is not parallel or coincident with the vibration direction A of the bone conduction sound generation device 2, or in other words, the vibration direction B of the air conduction sound generation device 3 and the vibration direction A of the bone conduction sound generation device 2 have an angle other than 0° therebetween. In some embodiments, as shown in Figure 10a and Figure 10c The air conduction sound generation device 3 is arranged to face away from the bone conduction sound generation device 2 (the side on which the diaphragm 321 of the air conduction sound generation device 3 is the front side, and the bottom surface 3b is the back surface), and at this time, the diaphragm 321 of the air conduction sound generation device 3 is close to the sound outlet hole 1003, which is beneficial to improve the sound transmission efficiency and increase the volume. In other embodiments, as shown in Figure 10b The air conduction sound generation device 3 is arranged to face the bone conduction sound generation device 2, for example, an opening can be arranged on the bottom surface 3b or other parts of the air conduction sound generation device 3, such as a ventilation hole 3c that communicates between the inside and the outside of the air conduction sound generation device 3, to allow sound to be transmitted out.

[0110] It can be understood that the air conduction sound generation device 3 is arranged to face or face away from the bone conduction sound generation device 2, and the thickness direction of the air conduction sound generation device 3 corresponds to the width direction of the sound generation unit 10, so that the space occupation in the width direction of the sound generation unit 10 can be reduced, and the sound generation unit 10 will not be too wide to cause discomfort.

[0111] Reference is made to Figure 4 and Figure 8When 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 of the shell 1000. 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 and is arranged to produce sound towards the proximal end 10040 of the side shell part 1004. 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 helps to improve the directness and clarity of the sound, reduces the loss and distortion of the sound, enables the human to hear more air conduction sound, has higher sound production efficiency and better effect, and can appropriately reduce the size of the air conduction sound production device 3, which is beneficial 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 of the internal sound wave of 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. 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.

[0112] In some embodiments, referring to Figure 11 , the included angle a2 between the vibration direction B of the air conduction sound production device 3 and the contact surface 10010 is 0-45°. By setting the included angle a2 between the vibration direction B of the air conduction sound production device 3 and the contact surface 10010 to 0-45°, the sound produced by the air conduction sound production device 3 can be better directed to the ear canal, improve the propagation efficiency of the sound, and at the same time reduce the leakage of the sound. Further optionally, the included angle a2 is 0-30°, and further optionally, the included angle a2 is 0-15°, so that the sound produced by the air conduction sound production device 3 can be more accurately directed to the ear canal. When the included 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 to the plane where the contact surface 10010 is located, and extends in a direction 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 to the inside of the auricle, so as to improve the sound gathering effect of the auricle and reduce the leakage of the sound.

[0113] 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 11In the shown embodiment, the two are connected to the face cover 1001 and the side shell part 1004 respectively through one connecting part 12 each, and the surface connected to the sound production device of the connecting part 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 part 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.

[0114] In some embodiments, the angle α3 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 transmitted to the ear, and further optionally, the angle α3 is 0-30°, and further optionally, the angle α3 is 0-15°, which can further increase the sound transmitted to the ear. Optionally, when the angle α3 is greater than 0°, the positive direction of the axis direction C of the sound outlet hole 1003 points to the side where the contact surface 10010 is located, so that the sound is guided by the sound outlet hole 1003 to the ear canal, reducing the leakage caused by outward dispersion. 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 points inward of the auricle, so as to improve the listening effect by using the sound gathering effect of the auricle, and to reduce the leakage.

[0115] 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°, i.e. parallel to the contact surface 10010, or greater than 0°, i.e. 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°, which means that the axis direction C can be parallel to the contact surface 10010, or inclined to the contact surface 10010 with an angle not exceeding 45°.

[0116] In some embodiments, the axis direction C of the sound outlet hole 1003 is consistent with the vibration direction B of the air conduction sound production device 3, that is, the axis direction C can be parallel or coincident with the vibration direction B, at this time, the axis direction C and the vibration direction B have the same angle with the contact surface 10010, 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 production 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 production device 3 and the bone conduction sound production 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 production 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 production unit, or in the case of the same volume, increasing the volume of the bone conduction sound production device 2 and / or the air conduction sound production device 3, thereby improving the sound production 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 production device 3 adjusts the direction of the sound emitted from the sound outlet hole 1003 through the sound outlet hole 1003.

[0117] It can be understood that the axis direction C of the sound outlet hole 1003 can be adjusted in various ways, for example, Figure 11 In the illustrated embodiment, the sound outlet hole 1003 is inclinedly arranged on the side shell portion 1004, and the axis direction C of the sound outlet hole 1003 is changed by the inclination of the side shell portion 1004 relative to the contact surface 10010, and the sound outlet hole 1003 is vertically arranged on the side shell portion 1004, and the axis direction C of the sound outlet hole 1003 is changed by the inclination of the side shell portion 1004 relative to the contact surface 10010.

[0118] The number of sound outlet holes 1003 can be one or more, for example, one, two, three or more.

[0119] Optionally, the number of sound outlet holes 1003 is one, to reduce the obstruction of the sound wave by the solid part between multiple sound outlet holes 1003, so that the sound can be more efficiently transmitted out.

[0120] 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.

[0121] 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 will be illustrated.

[0122] In some embodiments, the sound production unit 10 further comprises a front cavity 10042 and a back 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 housing assembly 100 is the front cavity, and the side of the diaphragm 321 facing the inside of the housing assembly 100 is the back 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 make the sound produced by the vibration of the diaphragm 321 concentrated through the front cavity 10042 and the sound hole 1003, thereby improving the sound transmission efficiency and reducing the volume loss, and thus a smaller volume of the 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 make the air flow smoothly, 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 10a 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 10b 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.

[0123] Optionally, the outer contour of the air conduction sound production device 3 in the section perpendicular to the vibration direction B is substantially rectangular, and the outer contour of the front cavity 10042 in the section perpendicular to the vibration direction B is also substantially rectangular, so as to make full use of the internal space of the housing 1000, make the size of the section of the air conduction sound production device 3 perpendicular to the vibration direction B larger, and thus make the air conduction sound production device 3 be able to increase the volume without increasing the thickness too much, ensure the 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.

[0124] 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 housing assembly 100, on the one hand, the housing assembly 100 can have a larger rear cavity 10044, reducing the F0 of the air conduction sound generating device 3, and improving the low frequency effect, on the other hand, the internal space of the housing assembly 100 can be effectively utilized, and the space arrangement of the two sound generating devices in the earphone head can be reasonably arranged. Compared with separating the two bone conduction sound generating devices 2 and the air conduction sound generating device 3 by a partition, the entire earphone head can be made 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 and reduce the weight feeling when wearing. The reduction in weight is also conducive to improving the frequency response of the high frequency band of the bone conduction sound transmission part and improving the sound quality of the high frequency band. In some embodiments, referring to Figure 10a , the shell 1000 is provided with a through hole 10000 communicating the inside and outside thereof, 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 conducive to increasing 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 where the air conduction sound generating device 3 is located 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 where the bone conduction sound generating device 2 is located is provided with a through hole 10000, and the partition is provided with a hole communicating the two cavities.

[0125] The air conduction sound generating device 3 is fixedly connected with the housing assembly 100. 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 magnet guide side plate 3101 and / or the magnet guide bottom plate 3100 (see Figure 28 and Figure 33 ) and the like. In other embodiments, in order to further reduce the occupation of the air conduction sound generating device 3 to the internal space of the housing assembly 100, the air conduction sound generating device 3 can be embedded in the side shell part 1004 to reduce the occupation of the air conduction sound generating device 3 to the internal space of the housing assembly 100, thereby facilitating the miniaturization of the sound generating unit 10, and further improving the firmness of the connection between the air conduction sound generating device 3 and the side shell part 1004. The air conduction sound generating device 3 is at least partially embedded in the side shell part 1004, for example, referring to Figure 8 and Figure 9The inner wall of the side shell part 1004 is provided with a mounting groove 10041, and the air guiding sound production device 3 is arranged in the mounting groove 10041. In the illustrated embodiment, the air guiding sound production device 3 is partially arranged in the mounting groove 10041, and in other embodiments, the air guiding sound production device 3 can be completely arranged in the mounting groove 10041. The mounting groove 10041 not only saves the space occupied by the air guiding sound production device 3, but also plays a role in positioning the air guiding sound production device 3. Compared with the scheme of attaching the air guiding sound production device 3 to the inner wall of the side shell part 1004, there is no need to additionally provide a limiting structure. Further, the mounting groove 10041 makes the contact area of the air guiding sound production device 3 and the shell assembly 100 relatively larger, and can also increase the firmness of the installation of the air guiding sound production device 3. Optionally, the depth D14 of the mounting groove 10041 is 0.3-1.5 mm, and the air guiding sound production device 3 has sufficient embedding depth, thereby increasing the reliability of positioning and connection. At the same time, the wall thickness of the part of the side shell part 1004 for mounting the air guiding sound production device 3 is not too thick, which is beneficial to reduce the mass of the sound production unit 10.

[0126] 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, that is, the mounting groove 10041 is communicated to the end surface 1000a. In this way, the air guiding sound production device 3 can be directly installed downward from the end surface 1000a, which is more convenient to install, and the space in the thickness direction of the sound production unit 10 can be more fully utilized, which is beneficial to increase the volume of the air guiding sound production device 3 and the effective radiation area of the diaphragm 321, or to reduce the volume of the sound production unit 10. Figure 9 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 apart from the back cover 1002. Further optionally, in other embodiments, the mounting groove 10041 is communicated to the back cover 1002, that is, the other side of the mounting groove 10041 extends to the inner surface of the back cover 1002, so as to further improve the space utilization and increase the size of the air guiding sound production device 3 available in the thickness direction of the sound production unit 10.

[0127] The air guiding sound production device 3 can be adhesively connected to the inner wall of the mounting groove 10041 and / or the back cover 1002 and / or the face cover 1001. When the air guiding 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 firmness of the connection can be further ensured, and the reliability of the operation of the air guiding sound production device 3 can be ensured. Optionally, the air guiding sound production device 3 and the groove bottom surface 10043 of the mounting groove 10041 are adhesively connected, for example, by double-sided adhesive tape or glue coating. Illustratively, reference is made to Figure 10aIn some embodiments, the outer edge of the diaphragm 321 of the air conduction sound production device 3 (for example, the outer ring 3210 mentioned below) is adhered to the groove bottom surface 10043. In other embodiments, the air conduction sound production device 3 further comprises a gland 33 connected to the diaphragm 321, and the gland 33 can be adhered to the groove bottom surface 10043. In other embodiments, the air conduction sound production device 3 can be adhered to the groove bottom surface 10043 through the magnetic bottom plate 3100 thereof. The air conduction sound production device 3 can also be adhered to the side wall of the mounting groove 10041 and the face cover 1001 through glue, thereby improving the firmness of the connection. Optionally, 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 housing 1000 facing the face cover 1001, so as to facilitate the installation and adhesion of the face cover 1001. Optionally, the air conduction sound production device 3 can also be adhered to the back cover 1002. In some embodiments, a cavity can be provided on the face cover 1001, and the air conduction sound production device 3 extends into the cavity beyond the end surface 1000a, so as to increase the volume of the air conduction sound production device 3 and improve the space utilization.

[0128] Reference Figure 9 and Figure 10a The side shell part 1004 of the housing 1000 is provided with the front cavity 10042, which communicates the mounting groove 10041 and the sound outlet hole 1003. The front cavity 10042 is arranged corresponding to the sound outlet 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 towards the sound outlet 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 outlet 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.

[0129] Next, the bone conduction sound production device 2 of the sound production unit 10 will be described.

[0130] First of all, it should be noted that the bone conduction sound production device 2 and the air conduction sound production device 3 comprise similar components, such as a support, a magnetic circuit assembly, and a coil. In order to facilitate the distinction, the corresponding components of the bone conduction sound production device 2 and the air conduction sound production 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 production 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 production device 3 are respectively referred to as an air conduction support, an air conduction magnetic circuit assembly, and an air conduction coil.

[0131] Figure 12a is a structural schematic diagram of the bone conduction sound production device 2 according to some embodiments of the present specification, Figure 12b is Figure 12a is a cross-sectional schematic diagram of the bone conduction sound production device 2 shown in Figure 13is a cross-sectional view of the bone conduction sound production device 2 of some other embodiments. The bone conduction sound production device 2 comprises 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 on the end face 202 of the bone conduction support 20. The bone conduction coil 22 is arranged outside 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 production 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, etc. In this specification, the stator of the bone conduction sound production device 2 refers to the part that does not move relative to the shell assembly 100 when the bone conduction sound production device 2 works, including the bone conduction support 20, the bone conduction coil 22 and other components. The vibrator of the bone conduction sound production device 2 refers to the part that moves relative to the bone conduction support 20 when the bone conduction sound production device 2 works, including the bone conduction magnetic circuit assembly 21 and the elastic sheet 23 and other components.

[0132] In some embodiments, the bone conduction support 20 is annular, with both ends open and surrounding 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 rectangular annular (the four corners can be rounded, right-angled, bevelled or other curved shapes that reduce the volume of the four corner parts), which is more convenient for cooperating with the air conduction sound production device 3 to be installed in the shell assembly 100 and makes more full use of the space in the shell assembly 100. It can be understood that in other embodiments, the shape of the bone conduction support 20 can also be other shapes, such as a circular ring, a racetrack shape, etc. Figure 14 That is, a schematic view of the bone conduction sound production device 2 when the bone conduction support 20 is in the shape of a racetrack is shown.

[0133] 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). The bone conduction magnetic gap 24 is formed between the bone conduction magnetic circuit assembly 21 and the bone conduction bracket 20, the outside 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.

[0134] Figure 12b , Figure 15a , Figure 16a , Figure 17a , Figure 18a , Figure 24a and Figure 24b shows a structural schematic diagram of the bone conduction magnetic circuit assembly 21 according to some embodiments of the present specification.

[0135] Figure 12b , Figure 15a and Figure 24a 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 outside of the two magnetic conductive plates 211 is surrounded by one bone conduction coil 22. Figure 12b , Figure 15a and Figure 24a The difference between the structures shown is that Figure 12b The magnetic conductive plate 211 shown is provided with a boss 2113 and a recess 2114, Figure 15a The magnetic conductive plate 211 shown is provided with a boss 2113 and is not provided with a recess 2114, Figure 24a and Figure 24b The gasket 26 is connected to the magnetic conductive plate 211, Figure 24a and Figure 24b The difference between the structures is that the bone conduction magnetic circuit assembly 21 is different.

[0136] Figure 16a 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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 13 and Figure 10c 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 16a The bone conduction magnetic circuit assembly 21 shown is applied to the bone conduction sound generating device 2 and the sound generating unit 10.

[0141] Next, the bone conduction support 20 of the bone conduction sound generating device 2 is exemplified.

[0142] The bone conduction support 20 can be made of a magnetic conductive material or a non-magnetic conductive material. The non-magnetic conductive material can be a non-metallic low-density material, such as plastic PC, ABS, PC+ABS, or PC+glass fiber, etc. The bone conduction support 20 made of a non-magnetic conductive material can reduce the mass of the bone conduction sound generating device 2 and reduce the mass of the stator of the bone conduction sound generating device 2, thereby improving the sensitivity of the bone conduction sound generating device 2 at high frequencies. When the bone conduction support 20 is made of a magnetic conductive material (such as magnetic conductive stainless steel), the BL value (which is used to reflect the electromagnetic characteristics, indicating the product of magnetic field strength and coil wire length) can be improved, the magnetic leakage can be reduced, and the sensitivity at medium frequencies can be improved. In this specification, unless otherwise specified, the bone conduction support 20 is made of a magnetic conductive material. Optionally, the tensile strength of the magnetic conductive material used to make the magnetic conductive bone conduction support 20 is 430MPa~780Mpa, and further optionally 450~600Mpa, the yield strength is >200Mpa, the elongation is >20%, the chemical composition contains >50% iron and 15~20% chromium, which is beneficial to make the bone conduction support 20 have good strength, prevent fracture and deformation, the chromium content of the bone conduction support 20 is beneficial to improve corrosion resistance, improve strength and hardness, improve high temperature performance, wear resistance and magnetic conductivity, and improve the effect of preventing magnetic leakage. Exemplarily, the material of the magnetic conductive bone conduction support 20 can be SUS430 and SUS304, etc.

[0143] Next, the elastic sheet 23 of the bone conduction sound generating device 2 is exemplified.

[0144] The number of elastic sheets 23 can be one, two or more. In some embodiments, as shown in Figure 12a and Figure 12b , the bone conduction sound generating 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 is beneficial to 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 0.1mm~0.25mm, and further optionally 0.13mm~0.2mm. Referring to Figure 19aThe spring piece 23 includes an outer frame 230, an inner frame 231 located inside the outer frame 230, and at least two elastic arms 232 connecting the outer frame 230 and the inner frame 231. The inner frame 231 is connected to the bone conduction magnetic circuit assembly 21. The outer frame 230 is connected to the bone conduction support 20. Optionally, the spring piece 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 adhesive or welding. For example, the outer frame 230 and the end face 202 are connected by welding. The bonding strength of welding is better than that of adhesive bonding, making the elastic coefficient of the spring piece 23 more stable, which is beneficial to the stability of the low-frequency F0 of the bone conduction sound generating device 2. The welding method can be spot welding or wire welding, preferably wire welding. Wire welding can reduce welding slag, thereby preventing welding slag from entering the product and generating noise. The welding strength is stronger than spot welding or adhesive bonding, which is beneficial to enhancing reliability.

[0145] In some embodiments, reference Figure 19a The outer frame 230 is in a continuous ring shape.

[0146] The spring 23 may include multiple elastic arms 232, which are arranged symmetrically about the center of the inner frame 231. The number of elastic arms 232 may be, for example, 2, 3, 4 or more. Optionally, the spring 23 may include 2 to 4 elastic arms 232. Figure 19a and Figure 19b The spring 23 shown includes two centrally symmetrically arranged elastic arms 232. Each elastic arm 232 of the spring 23 has an inner connecting portion 2320 connected to the inner frame 231 and an outer connecting portion 2321 connected to the outer frame 230. Unless otherwise specified, the spring 23 with two elastic arms 232 will be described below as an example.

[0147] Figure 19b This specification shows the results according to the instructions. Figure 19aThe top view of the spring piece 23 in the illustrated embodiment shows that the outer frame 230 is a rectangular ring (the four corners can be rounded, right-angled, oblique, or other curved shapes that reduce the volume of the four corners). There are two elastic arms 232. The outer connecting portion 2321 of the elastic arm 232 is connected to the long side 2300 of the outer frame 230. The elastic arm 232 first extends along the short side 2302 of the outer frame 230, then extends along the long side 2300, and then turns to connect with the end of the inner frame 231 opposite to the outer connecting portion 2321. In this way, the inner connecting portions 2320 of the two elastic arms 232 are respectively connected to the two ends of the inner frame 231 along the length direction of the spring piece 23, which can make fuller use of the space in the length direction of the spring piece 23 and reduce the space occupied in the width direction, thereby ensuring the width and length of the elastic arm 232. Optionally, the inner frame 231 is roughly rectangular and is consistent with the length and width directions of the outer frame 230, so as to reduce the space occupied in the width direction while ensuring the connection area with the bone magnetic circuit assembly 21.

[0148] The elastic piece 23 and elastic arm 232 of this structure can fully utilize the hollow area between the outer frame 230 and the inner frame 231, thereby allowing the width and length of the elastic arm 232 to be made larger, which in turn helps to ensure the vibration stability of the bone magnetic circuit assembly 21. Figure 20a and Figure 20b As shown, Figure 20a and Figure 20b Simulation diagrams of the first-order and second-order modes of the bone conduction sound-generating device 2 with the spring 23 in one embodiment are shown respectively. As can be seen from the diagrams, the resonant frequency of the first-order mode is 181.4Hz and the resonant frequency of the second-order mode is 1299.2Hz. The two are far apart, and the second-order mode has little influence on the first-order mode, which is beneficial to reduce rolling vibration, reduce vibration imbalance, avoid THD increase and reduce noise.

[0149] In some embodiments, the ratio of the projected area of ​​the magnetic guide plate 211 along the vibration direction A on a plane perpendicular to vibration direction A to the projected area of ​​the bone guide scaffold 20 along the vibration direction A on the same plane is 0.5 to 0.7, in order to maximize the magnetic circuit portion and improve magnetic field utilization. The projected areas of both the magnetic guide plate 211 and the bone guide scaffold 20 refer to the area enclosed by their projected outer contours. A larger area ratio of the magnetic guide plate 211 is beneficial for improving magnetic circuit efficiency, providing a stronger magnetic field over a larger range, thereby improving the efficiency of the drive coil. A stronger magnetic field helps to generate larger vibrations, providing stronger driving force, which can produce a larger amplitude, thereby increasing the volume of the sound output. In addition, it can also improve energy efficiency; higher magnetic circuit efficiency means that with the same input power, the device can produce a larger output volume and better sound quality. This helps to reduce overall power consumption and extend battery life, which is especially important in portable devices.

[0150] Next, the bone conduction coil 22 of the bone conduction sound device 2 and the mounting method thereof will be illustrated.

[0151] Referring to Figure 23 , the bone conduction coil 22 is fixed relative to the bone conduction support 20 and is arranged corresponding to the magnetic conductive plate 211 in the vibration direction A. The two ends of the bone conduction coil 22 along the vibration direction A are beyond the two ends of the magnetic conductive plate 211 along the vibration direction A, i.e. the two ends of the bone conduction coil 22 are beyond the outer end surface 2116 and the inner end surface 2115 of the magnetic conductive plate 211, so that the magnetic induction lines converged by the magnetic conductive plate 211 can be concentrated through the bone conduction coil 22, improving the utilization rate of the magnetic field. Optionally, the distance D5 between the two end surfaces 221 of the bone conduction coil 22 and the magnetic conductive plate 211 along the vibration direction A is 0.4-0.8mm, and the distance D5 refers to the distance between the two end surfaces of the bone conduction coil 22 and the magnetic conductive plate 211 facing the same direction. The distance D5 is greater than the maximum amplitude of the bone conduction magnetic circuit assembly 21 when the bone conduction sound device 2 is working. During the normal working process of the bone conduction sound device 2, the magnetic conductive plate 211 does not always exceed the bone conduction coil 22 along the vibration direction A upward or downward, so as to improve the driving efficiency. The maximum amplitude refers to the maximum vibration amplitude of the single side of the spring 23 in the frequency range of 20Hz-20KHz when a 0.5Vrms voltage is input to the bone conduction sound device 2. Further optionally, the distance of the bone conduction coil 22 beyond the inner end surface 2115 of the magnetic conductive plate 211 is greater than the distance of the bone conduction coil 22 beyond the outer end surface 2116 of the magnetic conductive plate 211. Since the magnetic induction line density near the magnet 210 is greater, such arrangement can further improve the density of the magnetic induction lines passing through the bone conduction coil 22 and improve the driving efficiency. Optionally, the difference between the distance of the two ends of the bone conduction coil 22 and the distance of the two end surfaces of the magnetic conductive plate 211 is 0.1-0.3mm.

[0152] In some embodiments, referring to Figure 22 and Figure 21 , the bone conduction coil 22 is directly pasted on the inner wall of the bone conduction support 20, and the two bone conduction coils 22 are arranged at intervals along the vibration direction A. In order to facilitate the positioning of the distance between the two bone conduction coils 22, in other embodiments, referring to Figure 23 , Figure 25a and Figure 25bThe bone conduction sound generating device 2 further comprises a coil holder 27, and the two bone conduction coils 22 are connected to two ends of the coil holder 27. The coil holder 27 can be assembled with the bone conduction coils 22 into an integral whole and then mounted into the bone conduction support 20, or the coil holder 27 and the bone conduction support 20 can be fixedly connected first, and then the bone conduction coils 22 are mounted on the coil holder 27. The bone conduction coils 22 are connected to the end faces of the coil holder 27, and the bone conduction coils 22 can be fixed, for example, by dispensing glue between the bone conduction coils 22 and the bone conduction support 20 and between the bone conduction coils 22 and the coil holder 27. The coil holder 27 can separate and position the two bone conduction coils 22, so that the distance between the two bone conduction coils 22 is more accurate, and the relative positions of the bone conduction coils 22 and the magnetic conductive plate 211 and the bone conduction support 20 are more accurate. The height H5 of the coil holder 27 is 0.5mm-1.5mm, and further optionally, the ratio of the height of the coil holder 27 to the height of the bone conduction coil 22 is 0.3-0.7, so as to provide better strength for supporting the bone conduction coil 22, while not occupying too much height space of the bone conduction coil 22, which is beneficial to the improvement of performance and stability. The height H5 of the coil holder 27 is further optionally 0.8mm-1.2mm, and the ratio of the height of the coil holder 27 to the height of the bone conduction coil 22 is further optionally 0.4-0.6, so as to further ensure the effect. It can be understood that the height H5 of the coil holder 27 can control the distance D15 of the bone conduction support 20 beyond the outer end face 2116 of the outermost magnetic conductive plate 211, so as to ensure the dimensional accuracy.

[0153] In some embodiments, the coil holder 27 is made of a magnetic conductive material, such as Figure 23 As shown in FIG. 7, the coil holder 27 does not protrude the bone conduction coil 22 towards the side where the bone conduction magnetic circuit assembly 21 is located, and optionally, the coil holder 27 is annular, and the inner diameter of the coil holder 27 is greater than or equal to the inner diameter of the bone conduction coil 22. Since the coil holder 27 does not protrude the bone conduction coil 22, the attraction force between the bone conduction magnetic circuit assembly 21 and the coil holder 27 can be reduced, and the vibration imbalance or noise of the bone conduction magnetic circuit assembly 21 caused by the attraction of the coil holder 27 can be reduced. Optionally, the distance D6 between the inner surface 270 of the coil holder 27 and the inner surface 222 of the bone conduction coil 22 (i.e. the distance that the coil holder 27 is recessed into the inner surface 222 of the bone conduction coil 22) is 0.05-0.2mm, which is beneficial to prevent the bone conduction magnetic circuit assembly 21 from being attracted by the coil holder 27 and causing failure to work. The distance D6 is further optionally 0.1-0.2mm, and the reliability is better.

[0154] In some other embodiments, the coil holder 27 is made of a non-magnetic conductive material, such as plastic, including but not limited to PC, PEI, PP, ABS, PA, ABS, PC+ABS, PC+glass fiber, etc. The non-magnetic conductive coil holder 27 can prevent the bone conduction magnetic circuit assembly 21 from being attracted by the coil holder 27 to cause vibration imbalance or noise, and can also prevent the bone conduction magnetic circuit assembly 21 from being stuck to the coil holder 27 to cause failure to work, thus improving the working reliability. In addition, compared with the magnetic conductive coil holder 27, the non-magnetic conductive coil holder 27 can prevent the magnetic induction lines from flowing out of the coil holder 27, thus improving the BL value of the bone conduction coil and increasing the sensitivity of the bone conduction sound generating device 2. The inner surface 270 of the coil holder 27 and the inner surface 222 of the bone conduction coil 22 are flush or inwardly recessed toward the side away from the bone conduction magnetic circuit assembly 21. For example, the coil holder 27 can be annular, and the inner diameter of the coil holder 27 is less than or equal to the inner diameter of the bone conduction coil 22. Optionally, the distance D6 between the inner surface 270 of the coil holder 27 and the inner surface 222 of the bone conduction coil 22 (i.e. the distance by which the coil holder 27 is recessed into the inner surface 222 of the bone conduction coil 22) is 0-0.15mm, so that the distance between the bone conduction coil 22 and the magnet 210 can be as close as possible, and compared with the magnetic conductive coil holder 27, the non-magnetic conductive coil holder 27 is less likely to rub against the bone conduction magnetic circuit assembly 21, thus making full use of the magnetic gap, which is conducive to ensuring the magnetic field strength between the magnetic conductive plate 211 and the bone conduction bracket 20, improving the BL value, ensuring the sensitivity of the bone conduction sound generating device 2, and further ensuring the connection strength between the coil holder 27 and the bone conduction coil 22. Figure 23 As shown in FIG. 8, when the inner diameter of the coil holder 27 is greater than the inner diameter of the bone conduction coil 22, the coil holder 27 is recessed into the interior of the bone conduction coil 22, and a groove can be formed between the bone conduction coil 22 and the coil holder 27, so that the glue can enter the groove to strengthen the bonding strength of the coil holder 27 and the bone conduction coil 22, and prevent the glue from protruding from the inner surface of the bone conduction coil 22 to affect the dimensional accuracy. Optionally, the distance D6 between the inner surface 270 of the coil holder 27 and the inner surface 222 of the bone conduction coil 22 (i.e. the distance by which the coil holder 27 is recessed into the inner surface 222 of the bone conduction coil 22) is 0.02-0.1mm. The recessed distance of the coil holder 27 is more appropriate, which is conducive to ensuring that the coil holder 27 will not exceed the bone conduction coil 22 due to assembly errors, so as to reduce or even prevent the bone conduction magnetic circuit assembly 21 from colliding with the coil holder 27 to produce collision noise during work, thus improving the sound generating effect.

[0155] It can be understood that the coil holder 27 does not necessarily have to be annular, but can also include a plurality of spaced blocks.

[0156] It can be understood that the bone conduction magnetic circuit assembly 21 can be connected by multiple parts (separate type), and can be formed by one-piece magnetization when the structure can be realized. 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 usually 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 used 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 15b 、 Figure 16b 、 Figure 17b and Figure 18b respectively show the schematic diagram of the one-piece bone conduction magnetic circuit assembly corresponding to the separate type bone conduction magnetic circuit assembly shown in Figure 15a 、 Figure 16a 、 Figure 17a and Figure 18a , in which the boundary between the two independent parts is shown by a solid line, and the boundary between different parts (magnetic conducting plate 211 and magnet 210) in the one-piece part is shown by a dashed line, Figure 16b and Figure 18b The spacer (pad 26) in Figure 15b and Figure 17b The spacer (boss 2113) in the bone conduction magnetic circuit assembly is one-piece. The one-piece magnetization method can refer to the patent document with application number 202111062238.3, the whole content of which is incorporated herein by reference.

[0157] Next, the air conduction sound generating device 3 of the sound generating unit 10 will be described.

[0158] In some embodiments, as Figure 26 to Figure 28 、 Figure 32 to Figure 35As shown, the air conduit sound production device 3 comprises an annular air conduit support 30, and an air conduit magnetic circuit assembly 31 and a diaphragm assembly 32 which are connected to the air conduit support 30. The air conduit support 30 can be made of light material (e.g. plastic) to reduce the mass and density of the air conduit sound production device 3, and optionally, the air conduit support 30 is non-magnetic. The diaphragm assembly 32 comprises an air conduit coil 320 located in the magnetic field of the air conduit magnetic circuit assembly 31 and a diaphragm 321 connected between the air conduit coil 320 and the air conduit support 30. When an alternating current is passed through the air conduit coil 320, it will generate an interaction force with the magnetic field of the air conduit magnetic circuit assembly 31, thereby driving the diaphragm 321 to vibrate.

[0159] Next, the air conduit magnetic circuit assembly 31 of the air conduit sound production device 3 is first described.

[0160] The air conduit magnetic circuit assembly 31 comprises at least a magnetic conductive support 310 connected to the bottom of the air conduit support 30, a main magnet 311 arranged on the surface of the magnetic conductive support 310 facing the diaphragm assembly 32, and a main pole core plate 313 connected to the main magnet 311.

[0161] The magnetic conductive support 310 is made of magnetic conductive material and comprises a plate-shaped magnetic conductive bottom plate 3100. Optionally, the thickness of the magnetic conductive bottom plate 3100 is 0.3-0.6mm to have good magnetic conductive effect and to facilitate preventing magnetic leakage. In some embodiments, referring to Figure 28 and Figure 33 The magnetic conductive support 310 further comprises magnetic conductive side plates 3101 protruding from the side edges of the magnetic conductive bottom plate 3100 towards the diaphragm assembly 32, and the magnetic conductive side plates 3101 at least partially extend to be oppositely arranged with the main pole core plate 313, and there is a gap between the magnetic conductive side plates 3101 and the main pole core plate 313, thereby forming an air conduit magnetic gap 315. Optionally, the magnetic conductive bottom plate 3100 is rectangular, and the magnetic conductive side plates 3101 can be arranged only on two opposite sides of the magnetic conductive bottom plate 3100, or can be arranged on all four sides of the magnetic conductive bottom plate 3100, or a magnetic conductive ring 3102 can be arranged on the magnetic conductive bottom plate 3100. Figure 29 to Figure 31 A top view of the magnetic conductive support 319 according to some embodiments of the present application is shown to facilitate showing the positions and numbers of the magnetic conductive side plates 3101. Figure 29 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the two short sides of the magnetic conductive bottom plate 3100, Figure 30 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the two long sides of the magnetic conductive bottom plate 3100, Figure 31 In the shown embodiment, one magnetic conductive side plate 3101 is arranged at each of the four sides of the magnetic conductive bottom plate 3100. It can be understood that the magnetic conductive side plates 3101 can be independent of each other, or can be connected to form a ring, and in some embodiments, as shown in Figure 32 to Figure 35 Figure 33 ​is Figure 32 a sectional view of the air-guided sound production device 2 shown in FIG. 1, Figure 34 is Figure 33 an enlarged view of the III part in FIG. 2, Figure 35 is Figure 32 a perspective view of the magnetic conductive support 310, the main magnet 311 and the main pole core plate 313 in FIG. 2. The magnetic conductive support 310 includes 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 an air-guided magnetic gap 315, and the air-guided coil 320 extends into the air-guided magnetic gap 315.

[0162] In some embodiments, reference is made to Figure 36 , Figure 36 for along Figure 28 a sectional view taken along the J-J sectional line in FIG. 2, the air-guided magnetic circuit assembly 31 further includes a secondary magnet 312 connected to the magnetic conductive bottom plate 3100 to increase the BL value of the air-guided coil 320. The number of the secondary magnet 312 can be one or more. Optionally, the number of the secondary magnet 312 is even, and the opposite two secondary 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 includes a secondary pole core plate 314 connected to the secondary magnet 312. Optionally, at least one secondary pole core plate 314 is connected to the surface of each secondary magnet 312 facing the diaphragm assembly 32 to improve the magnetic conductive effect. The secondary pole core plate 314 and the main pole core plate 313 are at least partially opposite to each other, and the air-guided magnetic gap 315 is formed between the secondary pole core plate 314 and the main pole core plate 313. Optionally, the distance between each secondary magnet 312 and the main magnet 311 is the same, and further optionally, the distance between each secondary pole core plate 314 and the main pole core plate 313 is 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 37 to Figure 39 is a top view of the air-guided magnetic circuit assembly 31 to show the positions and numbers of the secondary pole core plates 314 and the secondary magnets 312. Figure 37 In the embodiment shown, one secondary magnet 312 and one secondary pole core plate 314 are respectively arranged at the two short edges of the magnetic conductive bottom plate 3100. Figure 38 In the embodiment shown, one secondary magnet 312 and one secondary pole core plate 314 are respectively arranged at the two long edges of the magnetic conductive bottom plate 3100. Figure 39In the shown embodiment, one sub-magnet 312 and one sub-core plate 314 are arranged on each side of the magnetic conducting bottom plate 3100. Optionally, the length of the sub-core plate 314 is longer than the length of the sub-magnet 312, so as to further improve the magnetic conducting effect. The distance L9 between the length of the sub-core plate 314 and the length of the sub-magnet 312 can be 0.03-0.2mm. Optionally, the distance between the length of the sub-core plate 314 and the length of the sub-magnet 312 is the same.

[0163] The magnetic poles of the main magnet 311 are arranged along the vibration direction B of the air-conduction sound production device 3, and the magnetic poles of the sub-magnet 312 are also arranged along the vibration direction B and are 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-conduction sound production device 3 is consistent with the vibration direction of the diaphragm 321. The arrangement of the sub-magnet 312 can enhance the magnetic field strength, improve the BL value, and thus improve the sensitivity of the air-conduction sound production device 3. The sub-core plate 314 can guide the magnetic induction lines, and the sub-core plate 314 cooperates with the main core plate 313 to make the magnetic induction lines of the main magnet 311 and the sub-magnet 312 more concentratedly pass through the air-conduction coil 320 of the diaphragm assembly 32, so as to improve the driving force and the sensitivity.

[0164] It can be understood that the outer side of the sub-magnet 312 can be provided with a magnetic conducting side plate 3101 or can not be provided with the magnetic conducting side plate 3101. Optionally, when the sub-magnet 312 is arranged on one side of the main magnet 311, the magnetic conducting side plate 3101 is not arranged on the side, so as to reduce the mass and the volume. In some embodiments, as shown in Figure 40 Figure 40 Figure 26 The structure schematic diagram of the air-conduction magnetic circuit assembly 31 of the air-conduction sound production device 3 is shown. The magnetic conducting side plates 3101 are arranged on the two short sides of the magnetic conducting bottom plate 3100, and the magnetic conducting side plates 3101 are not arranged on the long sides. The sub-magnets 312 are arranged on the long sides of the magnetic conducting bottom plate 3100. Optionally, the distance between the magnetic conducting side plate 3101 and the main core plate 313 is the same as the distance between the sub-core plate 314 and the main core plate 313, so as to make the width of the air-conduction gap 315 around the main magnet 311 consistent, and the vibration more balanced.

[0165] In some embodiments, reference can be made to Figure 34 Figure 36 and Figure 41 ​​​, the thickness B4 of the main magnet 311 is 0.7-1.4mm, and the thickness B10 of the main pole core plate 313 is 0.2-0.4mm. When the main magnet 311 is too thin, the magnetic field provided by the main magnet 311 is weak, and when the main magnet 311 is too thick, the thickness of the main pole core plate 313 is insufficient due to space limitations, and the magnetic conductivity is not good. According to the thickness of the main magnet 311 and the main pole core plate 313, the thickness of the main magnet 311 and the main pole core plate 313 can be balanced, and a higher BL value can be provided, and the magnetic flux leakage can be avoided, thereby improving the efficiency and sound quality of the loudspeaker. Further, the thickness B4 of the main magnet 311 is 0.9-1.2mm, to further ensure the effect. Further, the ratio of the thickness of the main magnet 311 to the thickness of the main pole core plate 313 is 3-5.5. The main pole core plate 313 mainly concentrates and guides the magnetic field. The appropriate ratio (3-5.5) ensures that the magnetic field generated by the magnet is effectively concentrated and guided by the main pole core plate 313 to the air guide magnetic gap 315 where the air guide coil 320 is located, thereby increasing the magnetic flux density in the air guide magnetic gap 315. Higher magnetic flux density increases the magnetic force on the air guide coil 320, thereby increasing the driving force, allowing the diaphragm 321 to vibrate more and more accurately, thereby improving the sensitivity and output power of the air guide sound generating device 3.

[0166] Optionally, in the vibration direction B, the height overlap part exists between the main pole core plate 313 and the secondary pole core plate 314 and / or the magnetic conducting side plate 3101, Figure 34 and Figure 41 The position interval of the height overlap part is shown by a dashed line in the height overlap part, and the ratio of the thickness of the height overlap part to the thickness B10 of the main pole core plate 313 is 0.4-1, so that the magnetic field in the air guide magnetic gap 315 is more uniform, the air guide coil 320 and the diaphragm 321 vibrate more stably, and noise is not easily generated, thereby improving distortion. In addition, the magnetic induction lines can pass through the air guide coil 320 more vertically, which is conducive to the magnetic field utilization rate of the air guide magnetic circuit assembly 31, thereby improving the BL value, increasing the sensitivity, and increasing the sound generating loudness. Further, the ratio of the thickness of the height overlap part to the thickness B10 of the main pole core plate 313 is 0.5-0.9. When the folded ring part 3212 protrudes towards the side where the air guide magnetic circuit assembly 31 is located, the secondary pole core plate 314 and / or the magnetic conducting side plate 3101 are lower than the main pole core plate 313, which can provide vibration space for the downward protruding folded ring part 3212.

[0167] In some embodiments, reference is made to Figure 34The main pole core plate 313 is higher than the magnetic conduction side plate 3101, that is, in the vibration direction B of the air conduction sound production device 3, the surface of the main pole core plate 313 towards the diaphragm 321 is farther away from the magnetic conduction bottom plate 3100 than the surface of the magnetic conduction side plate 3101 towards the diaphragm 321. The end of the main pole core plate 313 close to the diaphragm 321 is provided with a chamfer 3131, which can reduce the mass of the main pole core plate 313 by removing part of the material. The side surface 3130 of the main pole core plate 313 and the chamfer 3131 have an intersection point O3, which is located on the plane of the end surface of the magnetic conduction side plate 3101 towards the diaphragm 321 or is located on the plane of the end surface of the magnetic conduction side plate 3101 towards the diaphragm 321 on the side of the diaphragm 321 (i.e. higher than the plane of the end surface of the magnetic conduction side plate 3101 towards the diaphragm 321), so as to maximize and optimize the height overlapping area of the magnetic conduction side plate 3101 and the main pole core plate 313, while reducing the mass of the main pole core plate 313, ensuring the consistency of the width of the air conduction magnetic gap 315 in the height overlapping area, so that the consistency and uniformity of the magnetic field strength in the air conduction magnetic gap 315 are better, thereby ensuring the sound production effect. It can be understood that in the embodiment in which the air conduction magnetic circuit assembly 31 comprises the auxiliary pole core plate 314, the main pole core plate 313 can also be provided with a chamfer 3131, and correspondingly, the intersection point O3 is located on the plane of the end surface of the auxiliary pole core plate 314 towards the diaphragm 321 or is located on the plane of the end surface of the auxiliary pole core plate 314 towards the diaphragm 321 on the side of the diaphragm 321.

[0168] In some embodiments, the ratio of the projection area of the main magnet 311 along the vibration direction B on a plane perpendicular to the vibration direction B to the projection area of the air conduction sound production device 3 along the vibration direction B on the same plane is 0.25-0.55, so that the main magnet 311 has a relatively large cross-sectional area, which is conducive to improving the utilization rate of the magnetic field, enabling the main magnet 311 to provide sufficient magnetic flux density and ensuring the efficient operation of the air conduction coil 320 in the air conduction magnetic gap 315. This helps to improve the sensitivity and efficiency of the air conduction sound production device 3, so that it can also produce a larger volume at a lower power. The projection areas of the main magnet 311 and the air conduction sound production device 3 refer to the areas enclosed by the outer contours of the projections.

[0169] Next, the diaphragm assembly 32 of the air conduction sound production device 3 will be described by way of example.

[0170] As Figure 34 , Figure 41 , Figure 42 and Figure 43As shown, 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 inside the outer ring sheet 3210, and a folded ring portion 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 connected or indirectly connected with the air guide support 30, and the two are relatively fixed. The cross section of the folded ring portion 3212 is arc-shaped, which can be concave towards the side where the air guide magnetic circuit assembly 31 is located (see Figure 41 and Figure 43 ), or can be convex away from the side where the air guide magnetic circuit assembly 31 is located (see Figure 34 and Figure 42 ). 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 coating or double-sided tape connection).

[0171] 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 is wrapped around the outside of the main pole core plate 313 and located inside the magnetic guide side plate 3101. The main pole core plate 313 and the magnetic guide 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 make sound.

[0172] In some embodiments, referring to Figure 28 and Figure 42 , in order to enhance the strength of the middle sheet body 3211 and improve the sound quality, the diaphragm assembly 32 further includes a reinforcing sheet 3213 attached to the surface of the middle sheet body 3211. The material of the reinforcing sheet 3213 can be the same as or different from that of the diaphragm 321. Optionally, the reinforcing sheet 3213 and the middle sheet body 3211 have the same shape and area, and the projection of the reinforcing sheet 3213 along the thickness direction of the middle sheet body 3211 coincides with the middle sheet body 3211, so as to comprehensively reinforce the middle sheet body 3211. Optionally, the thickness of the reinforcing sheet 3213 is 0.08-0.3 mm, 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 can be, for example, polyethylene, polypropylene, polyester, polyetherimide, polyethylene terephthalate, carbon fiber composite material or paper pulp fiber composite material, etc.; the metal can be, for example, aluminum, aluminum alloy, titanium, titanium alloy, aluminum-based material and foaming material compression compound, titanium-based material and foaming material compression compound, etc. The composite of the high polymer and the metal can be, for example, aluminum layer middle carbon fiber composite material. It can be understood that when the reinforcing sheet 3213 is provided, the middle sheet body 3211 can not be fully closed, as shown in Figure 42As shown, Figure 42 is an exploded view of the diaphragm 321 and the reinforcing sheet 3213 of an embodiment, the middle sheet body 3211 is provided with an opening 32110, and the reinforcing sheet 3213 is connected to the middle sheet body 3211 to seal the opening, thereby reducing the mass of the diaphragm assembly 32.

[0173] In some embodiments, referring to Figure 28 and Figure 41 , the air guide sound production device 3 further comprises a gland 33, which is annular and connected to the surface of the outer ring sheet 3210 and extends to be opposite to the folded ring portion 3212, thereby protecting the internal folded ring portion 3212, and the gland 33 is provided with a flat outer end surface 330, which can be connected to the shell assembly 100, for example, by applying glue or double-sided tape 331 on the outer end surface 330, so as to be glued to the shell assembly 100, Figure 44 shows the case where the double-sided tape 331 is provided on the outer end surface 330. Optionally, the inner end 334 (close to the end of the middle sheet body 3211) of the gland 33 is provided with a recess 332 facing the surface of the diaphragm 321, which makes the part closer to the inner end 334 of the gland 33 farther from the middle sheet body 3211 in the vibration direction B, thereby reliably avoiding the vibration of the diaphragm 321. Optionally, referring to Figure 26 and Figure 27 , the end surface 300 of the air guide support 30 is provided with a plurality of outwardly protruding protrusions 301, and the gland 33 is provided with limiting grooves 333 matched with the protrusions 301, so as to realize the positioning of the gland 33 through the matching of the limiting grooves 333 and the protrusions 301. Optionally, the protrusions 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 gland 33.

[0174] It can be understood that in the embodiments where the air guide sound production device 3 does not comprise the gland 33, the outer ring sheet 3210 can be connected to the shell 1000 and the diaphragm 321 can seal the front cavity 10042. For example, in the embodiments where the side shell portion 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 portion 1004, and in the embodiments where the side shell portion 1004 is provided with the mounting groove 10041, the outer ring sheet 3210 can be connected to the groove bottom surface 10043. In the embodiments where the air guide sound production device 3 comprises the gland 33, the gland 33 can be connected to the shell 1000 and the air guide sound production device 3 can seal the front cavity 10042. For example, in the embodiments where the side shell portion 1004 is not provided with the mounting groove 10041, the gland 33 can be connected to the inner wall of the side shell portion 1004, and in the embodiments where the side shell portion 1004 is provided with the mounting groove 10041, the gland 33 can be connected to the groove bottom surface 10043.

[0175] Next, an example of the volume of the bone conduction sound generating device 2 and the air conduction sound generating device 3 is described.

[0176] In some embodiments, the volume of the sound generating unit 10 (referring to a single sound generating unit 10) ranges from 2500 to 5500 mm3, so that the earphone head is not too large or too small, thereby improving the comfort of wearing and facilitating the installation of the internal sound generating device and other components. The volume of the sound generating unit 10 is the volume of the sound generating unit 10 after removing the ear hook 111, for example, the volume of the sound generating unit 10 obtained after cutting off the connection 111a between the ear hook 111 and the sound generating unit 10.

[0177] The volume of an object (for example, the bone conduction sound generating device 2, the air conduction sound generating device 3, and the sound generating unit 10) is calculated according to the size of the space it occupies, and the cavity or hollow part of the object is also included in its volume. For regular objects, such as cuboids, cylinders, or similar cuboids, similar cylinders, etc., the volume can be calculated by multiplying the base area by the height. The volume of the sound generating device (the bone conduction sound generating device 2 and the air conduction sound generating device 3) can be calculated by multiplying the maximum cross-sectional area by the thickness. The cross-section of the sound generating device is perpendicular to the thickness direction, and the cross-sectional area refers to the area enclosed by the outer contour of the cross-section. The maximum cross-sectional area can be obtained by measuring the area enclosed by the largest outer contour of the sound generating device in the thickness direction. For example, Figure 12a The maximum cross-sectional area of the illustrated bone conduction sound generating device 2 can be approximately the area enclosed by the outer contour of the bone conduction support 20, Figure 26 and Figure 33 The maximum cross-sectional area of the illustrated air conduction sound generating device 3 can be approximately the area enclosed by the outer contour of the end surface 300 of the air conduction support 30. For other irregular objects, the volume can be calculated by three-dimensionally scanning the outer contour of the object.

[0178] The larger the volume of the bone conduction sound generating device 2, the larger the size of the bone conduction support 20 and the internal bone conduction magnetic circuit assembly 21 and bone conduction coil 22 and other components can be made, thereby enabling the bone conduction sound generating device 2 to provide greater loudness. However, the larger the volume, the more the installation space of the air conduction sound generating device 3 and other components is compressed, affecting the sound generating effect of the air conduction sound generating device 3. Similarly, a small-volume air conduction sound generating device 3 can save space inside the device, so that other components of the earphone (bone conduction sound generating device, circuit board, etc.) can have more space, thereby improving the functionality and performance of the device.

[0179] In some embodiments, the volume of the bone conduction sound generating device 2 is set to 600-1000 mm3, and the volume of the air conduction sound generating device 3 is 180-500 mm3, so that the volume is more appropriate, and the volume of the bone conduction sound generating device 2 and the air conduction sound generating device 3 is balanced. Further optionally, the volume of the bone conduction sound generating device 2 can be selected to be 700-900 mm3, and the volume of the air conduction sound generating device 3 is 220-360 mm3, so that the space occupied by the bone conduction sound generating device 2 and the air conduction sound generating device 3 is more reasonable.

[0180] In some embodiments, the volume ratio of the air conduction sound generating device 3 and the sound generating unit 10 is 0.03-0.18, and the size of the volume ratio reflects the volume utilization rate. Generally, the larger the ratio, the larger the air conduction magnetic circuit assembly 31 of the air conduction sound generating device 3 can be, and the effective radiation area of the diaphragm can also be larger, and the acoustic effect is better, for example, the sensitivity of the air conduction sound generating device 3 is improved, but the air conduction sound generating device 3 is too large, which is not convenient for the installation of other parts, and occupies the space of the bone conduction sound generating device 2, affecting the sound generating effect of the bone conduction sound generating device 2, and too small volume ratio will waste the internal space, which is not conducive to miniaturization and weight reduction of the earphone. The volume ratio of the bone conduction sound generating device 2 and the sound generating unit 10 is 0.12-0.32, and similarly, the larger the ratio, the better the acoustic effect, for example, the sensitivity of the bone conduction sound generating device 2 is better, but the bone conduction sound generating device 2 is too large, which is not convenient for the installation of other parts, and occupies the space of the air conduction sound generating device 3, affecting the sound generating effect of the air conduction sound generating device 3, and too small volume ratio will waste the internal space, which is not conducive to miniaturization and weight reduction of the earphone.

[0181] Further optionally, the volume ratio of the air conduction sound generating device 3 and the sound generating unit 10 is 0.06-0.12, and the volume ratio of the bone conduction sound generating device 2 and the sound generating unit 10 is 0.18-0.28, so as to further make the space ratio occupied by the bone conduction sound generating device 2 and the air conduction sound generating device 3 more reasonable.

[0182] In some embodiments, in order to balance the volume and performance of the bone conduction sound generating device 2 and the air conduction sound generating device 3, the volume of the bone conduction sound generating device 2 is larger than the volume of the air conduction sound generating device 3, and optionally, the volume ratio of the bone conduction sound generating device 2 and the air conduction sound generating device 3 is 1.5-4.5. The volume of the bone conduction sound generating device 2 is large, which is conducive to providing a larger vibration amount, and the air conduction sound generating device 3 relies on the diaphragm to generate sound, which can achieve the air conduction sound effect with a smaller volume, thereby balancing the volume between air conduction sound and bone conduction sound, and improving the overall sound generating effect of the sound generating unit. The volume ratio of the bone conduction sound generating device 2 and the air conduction sound generating device 3 is further optionally 1.7-4.2, and more further optionally 2-3.6, so as to further improve the sound generating effect and facilitate installation in the shell assembly 100.

[0183] It should be noted that the embodiments herein can be combined with each other in the absence of conflicts, thereby obtaining more implementation solutions.

[0184] 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 to be within the scope of protection of the present application.

Claims

1. A sound emitting unit, characterized by, The application relates to a sound production unit (10) comprising: a housing assembly (100) comprising a housing (1000) and a face cover (1001) connected to the housing (1000), the housing (1000) being provided with a sound outlet hole (1003), and the face cover (1001) being used for contacting the facial skin; a bone conduction sound production device (2) arranged in the housing assembly (100) and connected to the housing assembly (100), the bone conduction sound production device (2) comprising a bone conduction support (20), a bone conduction magnetic circuit assembly (21), a spring sheet (23) connected between the bone conduction support (20) and the bone conduction magnetic circuit assembly (21), and a bone conduction coil (22) surrounding the outside of the bone conduction magnetic circuit assembly (21), the bone conduction coil (22) and the bone conduction magnetic circuit assembly (21) being located in the bone conduction support (20), and the bone conduction coil (22) being fixed relative to the bone conduction support (20); an air conduction sound production device (3) arranged in the housing assembly (100) and connected to the housing assembly (100), the air conduction sound production device (3) producing sound outwardly through the sound outlet hole (1003), the air conduction sound production device (3) comprising an air conduction support (30), an air conduction magnetic circuit assembly (31), and a diaphragm assembly (32) connected between the air conduction support (30) and the air conduction magnetic circuit assembly (31), the air conduction magnetic circuit assembly (31) being located in the air conduction support (30), the diaphragm assembly (32) comprising a diaphragm (321) and an air conduction coil (320) connected to the diaphragm (321), the air conduction magnetic circuit assembly (31) comprising an air conduction magnetic gap (315), and the air conduction coil (320) being at least partially located in the air conduction magnetic gap (315); the vibration direction A of the bone conduction sound production device (2) and the vibration direction B of the air conduction sound production device (3) have an included angle which is not 0.

2. The sound producing unit of claim 1, wherein, the housing (1000) comprises a side shell part (1004) and a back cover (1002), the bone conduction sound production device (2) is connected to the face cover (1001) and / or the back cover (1002), and the positive direction of the vibration direction A points to the contact surface (10010) of the face cover (1001) and the human body; the sound outlet hole (1003) is arranged on the side shell part (1004), the air conduction sound production device (3) is connected to the side shell part (1004), and the positive direction of the vibration direction B points to the side shell part (1004); the air conduction sound production device (3) is arranged to face the bone conduction sound production device (2), or the air conduction sound production device (3) is arranged to face away from the bone conduction sound production device (2); the air conduction sound production device (3) is provided with a ventilation hole (3c) which communicates between the inside and the outside of the air conduction sound production device (3).

3. The sound producing unit of claim 1, wherein, the ratio of the volume of the bone conduction sound production device (2) to the volume of the air conduction sound production device (3) is 1.5-4.

5.

4. The sound producing unit of claim 3, wherein, the ratio of the volume of the bone conduction sound production device (2) to the volume of the air conduction sound production device (3) is 2-3.

6.

5. The sound producing unit of claim 1, wherein, the volume of the sound production unit (10) is 2500 mm3-5500 mm3.

6. The sound producing unit of claim 5, wherein, The volume ratio of the air conduction sound production device (3) and the sound production unit (10) is 0.03-0.

18.

7. The sound producing unit of claim 6, wherein, The volume ratio of the air conduction sound production device (3) and the sound production unit (10) is 0.06-0.

12.

8. The sound producing unit of claim 5, wherein, The volume ratio of the bone conduction sound production device (2) and the sound production unit (10) is 0.12-0.

32.

9. The sound producing unit of claim 8, wherein, The volume ratio of the bone conduction sound production device (2) and the sound production unit (10) is 0.18-0.

28.

10. The sound producing unit of claim 1, wherein, The bone conduction magnetic circuit assembly (21) comprises at least one magnet (210) and at least two magnetic conductive plates (211), one magnet (210) is connected between two adjacent magnetic conductive plates (211), the magnetic poles of the magnet (210) are arranged along the vibration direction A of the bone conduction sound production device (2), when the number of the magnet (210) is greater than or equal to two, two adjacent magnets (210) are arranged with the same poles opposite to each other. The outer periphery of at least one or all of the magnetic conductive plates (211) is surrounded by the bone conduction coil (22), and the two ends of the bone conduction coil (22) along the vibration direction A of the bone conduction sound production device (2) exceed the two ends of the magnetic conductive plate (211) along the vibration direction A.

11. The sound producing unit of claim 10, wherein, The distance D5 between the two end faces (221) of the bone conduction coil (22) and the magnetic conductive plate (211) along the vibration direction A is greater than the maximum amplitude of the bone conduction magnetic circuit assembly (21) when the bone conduction sound production device (2) is working.

12. The sound producing unit of claim 10, wherein, The distance D5 between the two end faces (221) of the bone conduction coil (22) and the magnetic conductive plate (211) along the vibration direction A is 0.4-0.8mm.

13. The sound producing unit of claim 10, wherein, The distance by which the bone conduction coil (22) exceeds the inner end face (2115) of the magnetic conductive plate (211) is greater than the distance by which it exceeds the outer end face (2116) of the magnetic conductive plate (211).

14. The sound producing unit of claim 12, wherein, The difference between the distances of the two ends of the bone conduction coil (22) and the two end faces of the magnetic conductive plate (211) is 0.1-0.3mm.

15. The sound producing unit of claim 10, wherein, The bone conduction sound production device (2) further comprises a coil holder (27) connected to the bone conduction support (20), one bone conduction coil (22) is arranged outside each magnetic conductive plate (211), the number of the bone conduction coil (22) corresponds to the number of the magnetic conductive plate (211), the bone conduction coil (22) is connected to the coil holder (27), and the coil holder (27) separates two adjacent bone conduction coils (22).

16. The sound producing unit of claim 15, wherein, The inner diameter of the coil holder (27) is greater than or equal to the inner diameter of the bone conduction coil (22). The bone conduction support (20) is made of a magnetic conductive material, the distance D6 by which the coil holder (27) is recessed into the inner surface (222) of the bone conduction coil (22) is 0.05-0.2mm; or The bone conduction support (20) is made of a non-magnetic conductive material, the distance D6 by which the coil holder (27) is recessed into the inner surface (222) of the bone conduction coil (22) is 0.02-0.1mm.

17. The sound producing unit of claim 16, wherein, The ratio of the projection area of the magnetic conductive plate (211) along the vibration direction A of the bone conduction sound generating device (2) on a plane perpendicular to the vibration direction A to the projection area of the bone conduction support (20) on the same plane along the vibration direction A is 0.5-0.7, and the projection areas of the magnetic conductive plate (211) and the bone conduction support (20) refer to the areas enclosed by the outer contours of the projections.

18. The sound producing unit of claim 1, wherein, The bone conduction sound generating device (2) comprises two elastic sheets (23), and the two elastic sheets (23) are connected to the two ends of the bone conduction magnetic circuit assembly (21), respectively. The elastic sheet (23) comprises an outer frame body (230) connected to the bone conduction support (20), an inner frame body (231) located inside the outer frame body (230), and a plurality of elastic arms (232) connected between the outer frame body (230) and the inner frame body (231), and the inner frame body (231) is connected to the bone conduction magnetic circuit assembly (21).

19. The sound producing unit of claim 18, wherein, The outer frame body (230) is in the shape of a square ring, the elastic sheet (23) comprises two center-symmetric elastic arms (232), the elastic arm (232) has an outer connecting portion (2321) connected to the outer frame body (230), the elastic arm (232) is connected to the long side (2300) of the outer frame body (230), then extends along the short side (2302) and the long side (2300) of the elastic sheet (23) in sequence, and then is connected to the end of the inner frame body (231) facing away from the outer connecting portion (2321) of the elastic arm (232).

20. The sound producing unit of any one of claims 1 to 19, wherein, The air conduction magnetic circuit assembly (31) comprises a magnetic conductive support (310) connected to the air conduction support (30), a main magnet (311) arranged on the surface of the magnetic conductive support (310) facing the diaphragm assembly (32), and a main pole core plate (313) connected to the main magnet (311).

21. The sound producing unit of claim 20, wherein, The thickness B4 of the main magnet (311) is 0.7-1.4 mm, and the thickness B10 of the main pole core plate (313) is 0.2-0.4 mm.

22. The sound producing unit of claim 20, wherein, The ratio of the thickness B4 of the main magnet (311) to the thickness B10 of the main pole core plate (313) is 3-5.

5.

23. The sound producing unit of claim 20, wherein, The magnetic conductive support (310) comprises a magnetic conductive bottom plate (3100) and a magnetic conductive side plate (3101) protruding from the side edge of the magnetic conductive bottom plate (3100) toward the diaphragm assembly (32), and the magnetic conductive side plate (3101) and the main pole core plate (313) form the air conduction magnetic gap (315).

24. The sound producing unit of claim 23, wherein, The magnetic conductive support (310) comprises a plurality of magnetic conductive side plates (3101), and the plurality of magnetic conductive side plates (3101) are connected in the shape of a ring.

25. The sound producing unit of claim 23, wherein, The magnetic conductive support (310) comprises a sub-magnet (312) connected with the magnetic conductive bottom plate (3100) and a sub-pole core plate (314) connected with the sub-magnet (312), the sub-pole core plate (314) is arranged opposite to the main pole core plate (313) at least partially, and the air magnetic conduction gap (315) is formed between the two, the magnetic poles of the main magnet (311) and the sub-magnet (312) are arranged along the vibration direction B of the air conduction sound production device (3), and the arrangement directions of the magnetic poles of the two are opposite.

26. The sound producing unit of claim 25, wherein, The magnetic conductive bottom plate (3100) is rectangular, the opposite two long sides of the magnetic conductive bottom plate (3100) are provided with the sub-magnet (312) and the sub-pole core plate (314), and the opposite two short sides of the magnetic conductive bottom plate (3100) are provided with the magnetic conductive side plate (3101).

27. The sound producing unit of claim 20, wherein, The ratio of the projection area of the main magnet (311) along the vibration direction B of the air conduction sound production device (3) on a plane perpendicular to the vibration direction B to the projection area of the air conduction sound production device (3) on the same plane along the vibration direction B is 0.25-0.55, and the projection areas of the main magnet (311) and the air conduction sound production device (3) both refer to the areas enclosed by the outer contours of the projections.

28. A head-mounted sound production device, comprising: The sound production unit (10) comprises a sound production unit (10) according to any one of claims 1 to 27 and a wearing mechanism (11) for wearing the sound production unit (10) to the head of a human body.

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